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STMicroelectronics STF12NM50N
- Part No.:
- STF12NM50N
- Manufacturer:
- STMicroelectronics
- Category:
- FETs, MOSFETs
- Package:
- TO-220-3 Full Pack
- Datasheet:
-
STF12NM50N.pdf
- Description:
- MOSFET N-CH 500V 11A TO220FP
- Quantity:
- Payment:
- Shipping:
Inventory:9,210
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Product details
Overview
STF12NM50N from STMicroelectronics is an N-channel 500 V, 0.38 Ω (max), 11 A MDmesh™ II Power MOSFET in TO-220FP package, designed for high-efficiency switching converters. It features 100% avalanche tested ruggedness, low gate charge (30 nC), and low input capacitance (940 pF), enabling fast switching in offline SMPS and PFC stages.
For engineers reviewing the STF12NM50N datasheet, STF12NM50N pinout, STF12NM50N application, or STF12NM50N equivalent, this device is selected for high-voltage DC-DC conversion, industrial power supplies, and auxiliary power units where low conduction loss and robust unclamped inductive switching capability are critical.
Technical Context
The STF12NM50N employs ST's second-generation MDmesh™ vertical structure with strip layout to minimize RDS(on) and gate charge simultaneously. Its 500 V VDSS rating and 150 °C max junction temperature support operation in universal-input AC-DC systems.
It delivers 350 mJ single-pulse avalanche energy and exhibits 44 V/ns peak diode recovery dv/dt capability under 400 V, 11 A conditions - confirming suitability for hard-switched topologies with inductive loads and fast body diode recovery requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDSS | 500 V - Withstands full 400 V DC bus plus safety margin in universal-input offline converters |
| RDS(on) max | 0.38 Ω @ VGS = 10 V - Enables <1.2 W conduction loss at 5.5 A continuous drain current |
| Qg | 30 nC - Reduces gate drive power and enables >100 kHz switching in high-frequency PFC designs |
| ID (cont) @ TC = 100 °C | 6.7 A - Supports sustained operation in thermally constrained enclosures without derating below 100 °C case temp |
| EAS | 350 mJ - Provides reliable unclamped inductive switching margin for flyback and resonant converter snubberless operation |
| Rthj-case | 1.25 °C/W - Allows direct heatsink mounting to sustain 100 W dissipation with ≤125 °C junction rise above 25 °C heatsink |
| tr/tf | 15 ns / 14 ns @ RG = 4.7 Ω - Ensures minimal switching transition losses in high-speed hard-switched applications |
Pinout & Package
STF12NM50N uses the TO-220FP (Full-Pak) package: insulated plastic housing with internal isolation between drain (tab) and leads, rated for 2500 VRMS insulation from leads to heatsink. The tab is electrically connected to the drain terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Source) | Source terminal (low-side reference) | Primary return path for load current; connects to ground or low-side rail in buck/flyback topologies |
| 2 (Gate) | Control input | High-impedance MOS gate requiring <30 nC charge for full enhancement; sensitive to ESD and ringing |
| 3 (Drain) | High-voltage power input | Internally bonded to metal tab; must be isolated from heatsink unless system design permits common-drain configuration |
Key Features
| Feature | Design Value |
|---|---|
| 100% avalanche tested | Guarantees single-pulse EAS = 350 mJ at Tj = 25 °C - eliminates need for external clamping in many flyback designs |
| Low Qg & Ciss | 30 nC total gate charge and 940 pF input capacitance - reduces driver stress and improves efficiency above 100 kHz |
| MDmesh™ II technology | Combines low RDS(on) (0.38 Ω) and low Coss (100 pF) - enables superior figure-of-merit (RDS(on) × Qg) vs. legacy superjunction MOSFETs |
| Fast body diode recovery | trr = 340 ns @ Tj = 25 °C, Qrr = 3.5 µC - minimizes reverse recovery loss and EMI in synchronous rectification and LLC secondary side |
| TO-220FP insulation | 2500 VRMS isolation between leads and tab - enables safe mounting on live heatsinks without insulating pads in AC-DC primary-side applications |
Applications
| Industrial AC-DC Power Supplies | Server & Telecom PSU Primary Switch |
|---|---|
|
Use Scenario: 500 W universal-input offline flyback converter operating at 65 kHz. IC Role / Device Role / Timing Role: Main switching transistor handling 400 V DC bus and delivering regulated 12 V output. Use Value: Low RDS(on) and avalanche ruggedness eliminate snubber losses while maintaining reliability across line transients. |
Use Scenario: High-density 1 kW server PSU using active clamp forward topology. IC Role / Device Role / Timing Role: Primary-side switch managing 400 V input with tight duty cycle control and zero-voltage switching assist. Use Value: Fast tr/tf and low Qg reduce switching loss during high-frequency transitions, improving overall efficiency by ≥0.8%. |
| LED Driver Auxiliary Supply | PFC Boost Stage (Discrete) |
|
Use Scenario: Isolated auxiliary supply for LED streetlight controllers, deriving 15 V from 400 V DC bus. IC Role / Device Role / Timing Role: Self-oscillating flyback switch with integrated startup resistor and ZVS capability. Use Value: TO-220FP insulation allows direct heatsink mounting without creepage concerns, simplifying mechanical layout and reducing BOM count. |
Use Scenario: 300 W boost PFC stage in industrial motor drive front-end. IC Role / Device Role / Timing Role: Discrete boost switch operating in continuous conduction mode at 65–100 kHz. Use Value: Low Coss and optimized Qgd/Qgs ratio enable stable zero-current switching across wide load range, reducing EMI filter size. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage power switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STP12NM50N | Same die, TO-220 (non-isolated tab); Rthj-case = 1.25 °C/W identical, but requires insulating pad for heatsink mounting | Used where cost-sensitive designs accept added thermal interface complexity and lower isolation voltage (no 2500 VRMS rating) | Select when heatsink isolation is managed externally and footprint compatibility with standard TO-220 sockets is required |
| FDPF12N50 | ON Semiconductor part; 0.42 Ω RDS(on), 36 nC Qg, same 500 V rating but higher conduction and switching loss | Suitable for lower-frequency (<65 kHz) PFC or less efficiency-critical SMPS where gate drive capability is limited | Choose only if STF12NM50N is unavailable and system efficiency budget allows ≥0.5% penalty at full load |
Compared with STP12NM50N, STF12NM50N trades minor cost premium for built-in 2500 VRMS isolation and simplified thermal assembly; versus FDPF12N50, it delivers measurably lower RDS(on) and Qg, directly improving light-load efficiency and thermal headroom in high-frequency designs.
Availability
STF12NM50N is available at Aetrix Electronics and suitable for industrial AC-DC power supplies, telecom server PSUs, and LED driver auxiliary circuits requiring stable component supply and long-term production continuity.
Supply support for STF12NM50N includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The STF12NM50N belongs to ST's MDmesh™ II high-voltage power MOSFET product line, engineered specifically for high-efficiency, high-power-density offline switching applications including SMPS, PFC, and industrial motor drives.
FAQ
What is the maximum continuous drain current for STF12NM50N at 100 °C case temperature?
The STF12NM50N supports 6.7 A continuous drain current at TC = 100 °C, as specified in Table 2 of the datasheet. This value reflects thermal derating due to reduced heat dissipation capacity at elevated case temperatures and must be used in conjunction with Rthj-case = 1.25 °C/W to ensure Tj ≤ 150 °C under actual operating conditions.
Does STF12NM50N require a gate resistor for safe operation?
Yes - a gate resistor (typically 4.7 Ω to 22 Ω) is required to control dV/dt and prevent parasitic oscillation during switching. The datasheet specifies switching times (Table 7) with RG = 4.7 Ω, and omitting this resistor risks shoot-through, excessive EMI, and gate oxide stress due to ringing induced by low gate input resistance (4.5 Ω).
Can STF12NM50N replace STP12NM50N without board modifications?
No - although both share identical die and electrical specs, STF12NM50N uses TO-220FP (insulated tab) while STP12NM50N uses standard TO-220 (conductive tab). Mechanical mounting differs: STF12NM50N mounts directly to heatsink without insulator, whereas STP12NM50N requires mica pad or sil-pad. PCB footprint is identical, but thermal and isolation design must be revalidated.
Is STF12NM50N suitable for use in automotive applications?
No - STF12NM50N is not qualified to AEC-Q101 and lacks automotive-grade screening, temperature cycling validation, or guaranteed operation beyond 150 °C junction. ST explicitly states in the datasheet that non-automotive-grade parts are used in automotive applications at the user's own risk, and this device is intended for industrial and commercial power systems only.
STF12NM50N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- MDmesh™ II
- Package/Case:
- TO-220-3 Full Pack
- Packaging:
- Tube
- Product Status:
- Obsolete
- FET Type:
- N-Channel
- Technology:
- MOSFET (Metal Oxide)
- Drain to Source Voltage (Vdss):
- 500 V
- Current - Continuous Drain (Id) @ 25°C:
- 11A (Tc)
- Drive Voltage (Max Rds On, Min Rds On):
- 10V
- Rds On (Max) @ Id, Vgs:
- 380mOhm @ 5.5A, 10V
- Vgs(th) (Max) @ Id:
- 4V @ 250µA
- Gate Charge (Qg) (Max) @ Vgs:
- 30 nC @ 10 V
- Vgs (Max):
- ±25V
- Input Capacitance (Ciss) (Max) @ Vds:
- 940 pF @ 50 V
- FET Feature:
- -
- Power Dissipation (Max):
- 25W (Tc)
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220FP
STF12NM50N FAQ
1.How can I place an order for STF12NM50N through Aetrix?
Please submit a Request for Quotation (RFQ) for STF12NM50N on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STF12NM50N reliable?
The price and inventory of STF12NM50N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STF12NM50N is usually 5 days.
3.What payment methods are accepted for STF12NM50N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STF12NM50N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STF12NM50N?
STF12NM50N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STF12NM50N order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STF12NM50N?
For technical support, including STF12NM50N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STF12NM50N requirements.
6.How does Aetrix verify that STF12NM50N is sourced from the original manufacturer or authorized distributors?
All STF12NM50N products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STF12NM50N meets industry standards.
7.What is the process for return or replacement of STF12NM50N?
All STF12NM50N units undergo pre-shipment inspection (PSI). If there is an issue with STF12NM50N, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STF12NM50N part is unused and in its original packaging.
Return procedure for STF12NM50N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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