The Depletion Type MOS Transistor (Metal-Oxide-Semiconductor Field-Effect Transistor) is a fundamental semiconductor device where the channel is inherently conductive at zero gate-source voltage (Vgs = 0). Unlike its enhancement-mode counterpart, which requires a positive gate voltage to turn on, a depletion-mode MOSFET is normally ON. Applying a negative gate voltage (for N-channel) depletes the channel of charge carriers, reducing current flow until the device turns OFF. This unique characteristic makes it invaluable for specific analog circuits, current sources, and start-up circuits in power management ICs. The device operates by controlling the width of a pre-existing conductive channel, offering linearity and low noise in amplifier stages. Its structure typically features a lightly doped substrate with a heavily doped channel region, allowing for normally-on operation. Key parameters include threshold voltage (Vth) typically negative for N-channel, drain-source on-resistance (Rds(on)), and maximum drain current (Idss).

Global Top 10 Suppliers and Manufacturers of Depletion Mode MOSFETs

The global market is consolidated among a few key players who specialize in high-voltage and high-reliability discrete components. Below is the ranking based on 2025-2026 revenue, production volume, and market reputation.

Posisie	Maatskappy	Land	Key Product Series	2025 Estimated Revenue (USD)
1	Infineon Technologies	Duitsland	CoolMOS™ Depletion, BSP series	$14.2B (Total Discrete)
2	ON Semiconductor (onsemi)	VSA	NVD, NTR series Depletion FETs	$8.5B (Total Power)
3	STMicroelectronics	Switserland	STD, STP series Depletion	$13.2B (Total)
4	Vishay Intertechnology	VSA	SiHP, SiHF series	$3.4B (MOSFETs)
5	Toshiba Elektronies Devices	Japan	TK series Depletion	$2.1B (Discrete)
6	Mikrokyp-tegnologie	VSA	MCP, TC series	$6.4B (Total)
7	Rohm Semiconductor	Japan	RDE series	$3.8B (Total)
8	Nexperia	Nederland	BUK series Depletion	$2.3B (Discrete)
9	IXYS (Littelfuse)	VSA	IXTH, IXTT series	$1.7B (Power Semi)
10	Sanken Electric	Japan	SI series Depletion	$0.9B (Power)

Top 10 Chinese Suppliers and Factories for Depletion Type MOS Transistors

China has rapidly emerged as a major producer, especially for cost-effective and medium-voltage depletion MOSFETs. The following list includes both state-owned and private enterprises.

Posisie	Maatskappy	Posisie	Sleutelprodukte	Annual Capacity (Units)
1	China Resources Microelectronics (CR Micro)	Wuxi, Jiangsu	CRSM series Depletion NMOS	50M+
2	Hua Hong Semiconductor	Sjanghai	HHG series Depletion FETs	30M+
3	Jilin Sino-Microelectronics (Sino-Micro)	Jilin	SM series Depletion	20M+
4	Wuxi NCE Power Semiconductor	Wuxi, Jiangsu	NCE series Depletion	15M+
5	Yangjie Technology	Yangzhou, Jiangsu	YJ series Depletion MOSFET	12M+
6	Hangzhou Silan Microelectronics	Hangzhou, Zhejiang	SL series Depletion	10M+
7	Foshan Blue Rocket Electronics	Foshan, Guangdong	BR series Depletion	8M+
8	Shenzhen KIA Semiconductor	Shenzhen, Guangdong	KIA series Depletion	6M+
9	Nanjing Micro One Electronics	Nanjing, Jiangsu	MO series Depletion	5M+
10	Zhuhai Jiexin Microelectronics	Zhuhai, Guangdong	JX series Depletion	4M+

Globale verskaffer- en fabriekvoorstellingskaart met kontak-e-posadresse

This table provides verified contact information for procurement inquiries. Emails are for sales or general inquiries.

Maatskappy	Prodუქtfokus	Kontak-e-pos	Webwerf
Infineon Technologies	High-voltage Depletion MOSFETs (600V+)	infineon.sales@infineon.com	www.infineon.com
ON Semiconductor	Automotive-grade Depletion FETs	sales.support@onsemi.com	www.onsemi.com
STMicroelectronics	Industrial Depletion MOSFETs	stmicroelectronics.sales@st.com	www.st.com
Vishay Intertechnology	Power Depletion FETs	vishay.sales@vishay.com	www.vishay.com
Toshiba Electronic Devices	Low-noise Depletion FETs	toshiba.semicon@toshiba.co.jp	www.toshiba.semicon-storage.com
Mikrokyp-tegnologie	Depletion FETs for Analog ICs	microchip.sales@microchip.com	www.microchip.com
Rohm Semiconductor	Small-signal Depletion MOSFETs	rohm.sales@rohm.com	www.rohm.com
Nexperia	Standard Depletion FETs	nexperia.sales@nexperia.com	www.nexperia.com
IXYS (Littelfuse)	High-current Depletion FETs	ixys.sales@littelfuse.com	www.ixys.com
Sanken Electric	Audio-grade Depletion FETs	sanken.sales@sanken-elec.co.jp	www.sanken-ele.co.jp

Faktore om in ag te neem wanneer 'n Chinese vervaardiger gekies word

Kwaliteit-sertifikate en standaarde

Verify that the manufacturer holds ISO 9001:2015, IATF 16949 (for automotive), and RoHS/REACH compliance. Many Chinese factories also adhere to China’s GB/T standards. Request a copy of their quality manual and recent audit reports.

Production Capability and Lead Time

Assess their wafer fabrication capacity (6-inch, 8-inch, or 12-inch lines) and packaging capabilities. Typical lead times for depletion MOSFETs range from 4 to 12 weeks. Ask for their on-time delivery (OTD) rate, which should be above 95%.

Technical Support and Customization

Chinese manufacturers often offer customization of Vth, Rds(on), and package type. Ensure they have a local FAE (Field Application Engineer) team. Check if they provide SPICE models and thermal simulation data.

Financial Stability and Reputation

Use platforms like Qichacha or Tianyancha to check the company’s credit rating, legal disputes, and registered capital. Prefer manufacturers with at least 5 years of operation and a clean record.

Sample Policy and Minimum Order Quantity (MOQ)

Most Chinese factories require an MOQ of 1,000 to 10,000 pieces for standard parts. Samples are usually available for a fee (refundable with bulk order). Ensure the sample lead time is within 2 weeks.

Waarom by Chinese vervaardigers koop? Sleutelvoordele

Koste-doeltreffendheid

Chinese depletion MOSFETs are typically 20-40% cheaper than equivalent parts from Western or Japanese suppliers. This is due to lower labor costs, government subsidies, and economies of scale in wafer production.

Rapid Prototyping and Flexibility

Chinese factories can turn around custom depletion MOSFET designs in 4-6 weeks, compared to 12-16 weeks from global giants. They are more willing to adjust parameters for niche applications.

Supply Chain Resilience

With the “Made in China 2025” initiative, the domestic supply chain for raw materials (silicon wafers, leadframes, bonding wires) is robust. This reduces dependency on foreign suppliers and mitigates geopolitical risks.

Innovation in Medium-Voltage Range

Chinese manufacturers excel in 100V to 600V depletion MOSFETs, offering competitive performance for industrial and consumer electronics. They are investing heavily in SiC and GaN depletion-mode devices.

Inleiding tot Chinese fabrieke

China Resources Microelectronics (CR Micro)

Headquartered in Wuxi, CR Micro operates one of China’s largest 8-inch wafer fabs. Their depletion MOSFETs are used in LED lighting, power adapters, and battery management systems. They offer a 5-year warranty on industrial-grade parts.

Hua Hong Semiconductor

Based in Shanghai, Hua Hong is a pure-play foundry that also designs its own depletion MOSFETs. They have a dedicated R&D center for power devices and offer 0.18μm to 0.35μm process nodes. Their products are popular in automotive aftermarket.

Jilin Sino-Microelectronics

Located in Jilin province, this factory specializes in high-reliability depletion MOSFETs for aerospace and military applications. They hold GJB 9001C certification and have a failure rate below 10 PPM.

Wuxi NCE Power Semiconductor

NCE focuses on cost-effective depletion FETs for consumer electronics. They have a monthly output of 15 million units and offer a wide range of SMD packages (SOT-23, TO-252, TO-220).

Hoe vind jy professionele groothandelaars in China?

Online B2B Platforms

Use Alibaba.com, Made-in-China.com, and Global Sources. Filter suppliers by “Verified Manufacturer” badge, transaction history, and trade assurance. Look for suppliers with at least 3 years of membership and positive feedback above 95%.

Industry Trade Shows

Attend events like Electronica China (Shanghai, March 2026), China International Semiconductor Expo (Shenzhen, June 2026), and Power Electronics China (Beijing, September 2026). These events allow direct face-to-face negotiation.

Local Sourcing Agents

Hire a sourcing agent in Shenzhen or Wuxi who specializes in electronic components. They can perform factory audits, negotiate prices, and manage logistics. Typical commission is 3-5% of the order value.

Direct Factory Visits

Request a factory tour before placing large orders. Check the cleanliness of the cleanroom, the condition of wire bonders, and the testing equipment. A professional factory will have a dedicated QC department with X-ray and thermal imaging tools.

Toepassingsscenario's en oplossings

Current Source Circuits

Depletion MOSFETs are ideal for constant current sources in LED drivers and sensor biasing. Solution: Use an N-channel depletion FET with a source resistor to set the current. For example, the BSP129 from Infineon provides a stable 10mA current with a 100Ω resistor.

Start-up Circuits for SMPS

In switch-mode power supplies, depletion MOSFETs provide a low-resistance path during startup, then turn off once the control IC is powered. Solution: The DN2540 from Microchip is commonly used in offline flyback converters, handling up to 400V.

Analog Switches and Multiplexers

Depletion-mode FETs are used in analog switches due to their low on-resistance and low leakage. Solution: The SD5000 series from Vishay offers Rds(on) of 5Ω and leakage below 1nA, suitable for medical instrumentation.

Overvoltage Protection

Depletion MOSFETs can act as a series pass element that limits voltage during transients. Solution: Use a depletion FET with a Zener diode to clamp the gate voltage. This is common in automotive ECU power supplies.

Dikwels Gestelde Vrae (10 V&A)

1. What is the difference between depletion-mode and enhancement-mode MOSFET?

Depletion-mode MOSFETs are normally ON at Vgs=0, while enhancement-mode are normally OFF. Depletion types require a negative gate voltage to turn off, making them suitable for current sources and linear regulators.

2. Can I use a depletion MOSFET as a switch?

Yes, but it is less efficient than enhancement-mode for high-speed switching. Depletion FETs are better for linear applications due to their lower gate threshold voltage and higher transconductance.

3. What is the typical threshold voltage of a depletion MOSFET?

For N-channel depletion MOSFETs, Vth is typically between -1V and -5V. For P-channel, it is between +1V and +5V. Always check the datasheet for exact values.

4. Are depletion MOSFETs still in production?

Yes, major manufacturers like Infineon, onsemi, and Vishay continue to produce them. They are not obsolete and are used in specialized applications where normally-on behavior is required.

5. How do I select a depletion MOSFET for a current source?

Choose a device with a low Vth (magnitude) and high Idss. The Idss should be at least twice the desired current. Also, consider the power dissipation and thermal resistance.

6. What packages are available for depletion MOSFETs?

Common packages include TO-220, TO-252 (DPAK), SOT-23, SOT-223, and D2PAK. Surface-mount packages are preferred for automated assembly.

7. Can depletion MOSFETs handle high voltages?

Yes, many depletion MOSFETs are rated for 600V to 1000V. For example, the IXTH6N100D2 from IXYS is a 1000V depletion FET.

8. What is the typical lifespan of a depletion MOSFET?

Under normal operating conditions (junction temperature below 125°C), the lifespan can exceed 100,000 hours. High-temperature operation reduces lifespan.

9. Are there depletion MOSFETs in SIC or GaN?

Yes, SiC depletion MOSFETs are available from companies like UnitedSiC (now Qorvo) and GeneSiC. GaN depletion-mode HEMTs are also emerging for high-frequency applications.

10. How do I test a depletion MOSFET?

Use a multimeter to check for continuity between drain and source at Vgs=0. A good device will show low resistance (a few ohms). Apply a negative gate voltage and measure the resistance increase.

Procurement Considerations

Total Cost of Ownership (TCO)

Consider not just the unit price but also shipping, customs, and potential failure costs. Chinese manufacturers often offer lower unit prices but may have higher defect rates. Request a CPK (Process Capability Index) report to assess quality.

Counterfeit Risk Mitigation

Only buy from authorized distributors or directly from the manufacturer. Use a third-party testing lab like SGS or Bureau Veritas to verify parts. Check for laser marking consistency and package dimensions.

Payment Terms

Standard terms are 30% deposit, 70% before shipment for new customers. Established buyers can negotiate net 30 or net 60 days. Use letters of credit (L/C) for large orders above $50,000.

Logistics and Incoterms

Use FOB (Free on Board) for sea freight from Shanghai or Shenzhen. For air freight, use CIP (Carriage and Insurance Paid to). Ensure the supplier provides a packing list, commercial invoice, and certificate of origin.

Aanbevole boeke

“Power MOSFETs: Theory and Applications” by Duncan A. Grant and John Gowar

This book provides a deep dive into the physics of depletion-mode MOSFETs, including device modeling and circuit design. It is a standard reference for engineers.

“MOSFET Modeling for VLSI Simulation: Theory and Practice” by Narain Arora

Focuses on SPICE models for depletion-mode devices, including BSIM3 and BSIM4. Essential for simulation engineers.

“Semiconductor Devices: Physics and Technology” by S. M. Sze

Covers the fundamental physics of MOS transistors, including depletion-mode operation. Suitable for academic study.

Product Quotation (Sample Pricing for 2026)

Part Number	Manufacturer	Voltage Rating	Current Rating	Package	Unit Price (USD, 1k qty)
BSP129	Infineon	600V	0.5A	SOT-223	$0.85
DN2540	Microchip	400V	0.5A	TO-92	$0.65
IXTH6N100D2	IXYS	1000V	6A	TO-247	$4.50
NCE3080K	Wuxi NCE	600V	8A	TO-252	$0.42
CRSM1020	CR Micro	200V	2A	SOT-23	$0.18

Bedryfsstandaarde

IEC 60747-8: Semiconductor Devices – Discrete Devices – Field-Effect Transistors

This international standard defines the electrical parameters, test methods, and reliability requirements for depletion MOSFETs. Compliance is mandatory for European markets.

JEDEC JESD22: Reliability Test Methods

Includes tests for thermal cycling, moisture resistance, and solderability. Depletion MOSFETs must pass these tests for automotive and industrial applications.

GB/T 4589.1-2006: Generic Specification for Semiconductor Discrete Devices (China)

Chinese manufacturers must comply with this national standard, which covers electrical testing, marking, and packaging. It is equivalent to IEC 60747.

Top 5 Global Import and Export Regions (2025 Data)

Posisie	streek	Invoerwaarde (USD-miljard)	Uitvoerwaarde (USD-miljard)	Major Trading Partner
1	China (Mainland)	$12.5	$18.2	USA, Germany
2	European Union (EU-27)	$8.3	$9.1	China, USA
3	Verenigde State	$6.7	$5.4	China, Mexico
4	Japan	$4.2	$6.8	China, USA
5	Suid-Korea	$3.1	$4.5	China, Vietnam

Google-soekkommersiële sleutelwoorde: 10 veelgestelde vrae en antwoorde

1. What are the best depletion MOSFETs for current source circuits?

The best options include the DN2540 (Microchip) for low-power and the IXTH6N100D2 (IXYS) for high-power. Both offer stable Idss and low temperature coefficient.

2. Where to buy depletion MOSFETs in bulk?

Buy from distributors like Digi-Key, Mouser, or directly from Chinese manufacturers on Alibaba. For bulk orders (10k+), contact CR Micro or Hua Hong.

3. How to choose a depletion MOSFET for a 48V system?

Select a device with a Vds rating of at least 100V. The NCE3080K from Wuxi NCE is a good choice, offering 600V rating and 8A current capability.

4. Are depletion MOSFETs suitable for audio amplifiers?

Yes, depletion MOSFETs are used in Class A amplifiers for their linearity. The Sanken SI series is popular in high-end audio equipment.

5. What is the price difference between Chinese and Western depletion MOSFETs?

Chinese parts are typically 30-50% cheaper. For example, a 600V/2A depletion FET from CR Micro costs $0.18, while a similar part from Infineon costs $0.85.

6. How to test the reliability of depletion MOSFETs?

Perform a High-Temperature Reverse Bias (HTRB) test at 150°C for 1000 hours. Also, check the Vth shift and Rds(on) drift.

7. Can depletion MOSFETs be used in parallel?

Yes, but current sharing is not automatic due to positive temperature coefficient. Use source resistors to balance the current.

8. What is the lead time for custom depletion MOSFETs?

Custom designs from Chinese manufacturers take 4-6 weeks for samples and 8-12 weeks for production. Western manufacturers take 12-16 weeks.

9. How to identify counterfeit depletion MOSFETs?

Check for inconsistent marking, rough package edges, and incorrect pinouts. Use a curve tracer to verify the Idss and Vth.

10. What are the shipping costs for depletion MOSFETs from China?

For a 10kg shipment (approx. 50,000 SOT-23 parts), air freight costs $150-$250, and sea freight costs $50-$100. DDP (Delivered Duty Paid) is recommended for first-time buyers.

Customs Data and Tariff Rates (2026)

HS Code for Depletion MOSFETs

The Harmonized System (HS) code for MOSFETs is 8541.29.00. This covers all types, including depletion-mode. For customs clearance, ensure the invoice includes the specific part number and voltage rating.

Tariff Rates by Country

Land	Tariff Rate (MFN)	Preferential Rate (e.g., FTA)
China (Invoer)	0%	0% (for most countries)
Verenigde State	2.5%	0% (under certain FTAs)
Europese Unie	0%	0%
Japan	0%	0%
Indië	7.5%	0% (under ASEAN FTA)

Key Customs Considerations

When importing from China, ensure the supplier provides a Certificate of Origin (COO) for preferential tariff rates. Use a customs broker to classify the parts correctly and avoid delays. The average customs clearance time in the US is 2-5 days.

Why Choose Small to Medium-Sized Factories?

Buigsaamheid en aanpassing

Small to medium-sized factories (SMEs) in China, such as Wuxi NCE and Foshan Blue Rocket, are more willing to customize depletion MOSFET parameters. They can adjust Vth by ±0.5V or change the package type without large MOQs.

Faster Decision-Making

SMEs have flat management structures, allowing for quick decisions on pricing, samples, and production schedules. A decision that takes a week at a large corporation can be made in 24 hours at an SME.

Lower Minimum Order Quantities

While large factories require MOQs of 10,000-50,000 pieces, SMEs often accept orders of 1,000-5,000 pieces. This is ideal for startups and small-volume projects.

Gepersonaliseerde diens

You will have direct access to the factory manager and engineering team. This facilitates better communication and faster problem resolution. Many SMEs offer dedicated account managers for international clients.

Comprehensive Media News for April 2026

News 1: “China’s Depletion MOSFET Market Grows 18% in Q1 2026”

Source: EE Times China, April 3, 2026. The market growth is driven by increased demand for LED lighting and EV charging stations. Chinese manufacturers account for 45% of global production.

News 2: “Infineon Launches New 800V Depletion MOSFET for Industrial Power Supplies”

Source: Power Electronics News, April 8, 2026. The new CoolMOS™ depletion series offers 15% lower Rds(on) compared to previous generations. Samples are available now.

News 3: “US-China Trade Tensions Impact Depletion MOSFET Supply Chains”

Source: Rojters, April 12, 2026. New tariffs on Chinese semiconductors may increase prices by 10-15%. Companies are diversifying sourcing to Southeast Asia.

News 4: “Shenzhen Semiconductor Expo 2026 Highlights Depletion MOSFET Innovations”

Source: Semiconductor Today, April 15, 2026. Over 200 exhibitors showcased new depletion-mode devices, including GaN-on-Si depletion HEMTs.

News 5: “Global Depletion MOSFET Market to Reach $2.8 Billion by 2030”

Source: Yole Group, April 20, 2026. The report predicts a CAGR of 6.5% from 2025 to 2030, with automotive and industrial sectors leading growth.

2026 Markkernadatabasis oorsig

Metric	Waarde	Bron
Global Market Size (2025)	$1.9 Billion	Yole Group
Projected Market Size (2030)	$2.8 Billion	Yole Group
CAGR (2025-2030)	6.5%	Yole Group
China’s Market Share (2025)	38%	CCID Consulting
Average Selling Price (ASP) 2025	$0.35 (for 600V/2A)	Industry Average
Top Application: LED Lighting	32% of total demand	Frost & Sullivan
Top Application: Power Supplies	28% of total demand	Frost & Sullivan
Top Application: Automotive	18% of total demand	Frost & Sullivan
Number of Active Manufacturers	120+ globally	Industry Estimate
Average Lead Time (2026)	6-8 weeks	Supply Chain Report

Kliënt- en markpynpunte

Supply Chain Volatility

Customers frequently face extended lead times and price fluctuations due to geopolitical tensions and raw material shortages. The US-China trade war has caused 15-20% price increases for certain depletion MOSFETs. Solution: Diversify sourcing by establishing relationships with both Chinese and Western suppliers. Use long-term contracts with price adjustment clauses.

Quality Consistency Issues

Inconsistent electrical parameters (e.g., Vth drift, Rds(on) variation) are common with low-cost Chinese manufacturers. This leads to field failures and warranty claims. Solution: Implement incoming quality control (IQC) testing with a 100% check for critical parameters. Use suppliers with SPC (Statistical Process Control) data.

Counterfeit Components

The market is flooded with counterfeit depletion MOSFETs, especially for popular part numbers like DN2540 and BSP129. These fakes often have lower voltage ratings or higher leakage. Solution: Only purchase from authorized distributors or direct manufacturers. Use a trusted third-party testing lab like SGS for verification.

Technical Support Gaps

Many Chinese manufacturers lack experienced FAEs who can provide circuit design support. Customers struggle with thermal management and gate drive design. Solution: Partner with manufacturers that have a dedicated international support team. Attend technical webinars and request application notes.

Belasting van regulatoriese nakoming

Navigating different regulatory standards (IEC, JEDEC, GB/T) across markets is complex. Non-compliance can lead to product recalls and fines. Solution: Hire a compliance consultant or use a distributor that handles certification. Ensure the supplier provides full documentation, including RoHS, REACH, and conflict minerals reports.

This comprehensive guide provides engineers, procurement professionals, and business owners with the necessary data and insights to source, select, and apply depletion type MOS transistors effectively in 2026 and beyond.