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STMicroelectronics STF7NM50N
- Part No.:
- STF7NM50N
- Manufacturer:
- STMicroelectronics
- Category:
- FETs, MOSFETs
- Package:
- TO-220-3 Full Pack
- Datasheet:
-
STF7NM50N.pdf
- Description:
- MOSFET N-CH 500V 5A TO220FP
- Quantity:
- Payment:
- Shipping:
Inventory:4,206
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Product details
Overview
STF7NM50N from STMicroelectronics is an N-channel 500 V, 5 A, 0.70 Ω RDS(on) Power MOSFET in TO-220FP package, realized with second-generation MDmesh™ technology for high-efficiency switching converters. It features 100% avalanche tested ruggedness, low gate charge (12 nC), and fast switching (td(off) = 40 ns), enabling use in offline SMPS primary-side switch applications.
For engineers reviewing the STF7NM50N datasheet, STF7NM50N pinout, STF7NM50N application, or STF7NM50N equivalent, key selection criteria include its 500 V VDSS, 0.70 Ω RDS(on) at VGS = 10 V, 12 nC total gate charge, 45 W PTOT (TO-220FP), and 2.78 °C/W Rthj-case - all critical for flyback and LLC resonant converter design.
Technical Context
This MOSFET employs ST's second-generation MDmesh™ vertical structure combined with strip layout to minimize conduction and switching losses simultaneously. Its 500 V rating supports universal-input AC/DC front-end designs, while low Ciss (400 pF) and Crss (4 pF) reduce EMI and improve dv/dt immunity.
The device integrates a robust body diode with 5 A continuous ISD, 1.3 V VSD, and 250 ns trr at 25°C - enabling quasi-resonant and ZVS operation. Avalanche energy rating of 100 mJ ensures reliability under unclamped inductive switching stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDSS | 500 V - Withstands full rectified 375 VAC mains input with margin for surge and ringing. |
| RDS(on) | 0.70 Ω max @ VGS = 10 V - Enables <1.8 W conduction loss at 5 A DC, critical for thermal management in compact adapters. |
| Qg | 12 nC - Reduces gate drive power and allows use of low-cost, low-current drivers in high-frequency (>100 kHz) topologies. |
| td(off) | 40 ns typ - Supports fast turn-off in hard-switched flyback and forward converters, minimizing overlap loss. |
| Rthj-case | 2.78 °C/W - Allows 45 W dissipation at TC = 25°C; enables heatsink-limited operation without derating below 100°C case temperature. |
| EAS | 100 mJ - Guarantees single-pulse avalanche survival during transient overvoltage events in offline PSUs. |
| ID (cont) | 5 A @ TC = 25°C - Sustains full-load current in 30–65 W SMPS designs with appropriate heatsinking. |
Pinout & Package
STF7NM50N is housed in TO-220FP (Full-Pak) package - a variant of TO-220 with insulated backside and shorter leads for surface-mount compatibility and improved creepage/clearance. The package provides direct thermal path from die to heatsink via isolated tab.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Source) | Power return node for load current | Low-impedance connection to PCB ground plane; ties to source of synchronous rectifier in secondary-side control schemes. |
| 2 (Gate) | Control terminal for channel modulation | High-impedance input requiring <12 nC charge; sensitive to ESD and requires RC snubber or gate resistor ≥4.7 Ω for stability. |
| 3 (Drain) | High-voltage power input node | Connected to bulk capacitor (+) or transformer primary; carries full switching voltage swing up to 500 V. |
Key Features
| Feature | Design Value |
|---|---|
| MDmesh™ second-generation structure | Reduces RDS(on) × Qg figure-of-merit by >30% vs. first-gen, enabling higher efficiency at 65–135 kHz switching frequencies. |
| 100% avalanche rated | Guarantees operation under unclamped inductive switching stress without parameter shift or failure - eliminates need for external clamping in cost-sensitive designs. |
| Low Crss (4 pF) | Minimizes Miller effect, improving noise immunity and enabling stable gate drive with minimal negative voltage undershoot during turn-off. |
| ECOPACK® compliant | Lead-free second-level interconnect meets RoHS and JEDEC JESD97; suitable for lead-free reflow and automated assembly. |
| Fast body diode (trr = 250 ns) | Supports quasi-resonant operation in flyback converters by enabling zero-voltage switching during diode commutation. |
Applications
| AC/DC Adapter Primary Switch | Flyback Converter Main Switch |
|---|---|
Use Scenario: 36–65 W universal-input wall adapter powering consumer electronics. IC Role / Device Role: High-side main switch in discontinuous conduction mode (DCM) flyback topology. Use Value: 0.70 Ω RDS(on) and 12 nC Qg enable >88% efficiency at full load while maintaining thermal headroom on small heatsinks. |
Use Scenario: Isolated 24 V/2 A industrial power supply with reinforced insulation. IC Role / Device Role: Primary-side power switch driving transformer primary with 500 V clearance requirement. Use Value: 500 V VDSS and 100 mJ EAS ensure reliable operation under 300 VAC line surges and lightning-induced transients. |
| LED Driver Bulk Switch | Industrial SMPS Input Stage |
Use Scenario: Constant-current LED driver for street lighting with active PFC + flyback stage. IC Role / Device Role: Post-PFC boost switch or flyback primary switch handling 400 V DC bus. Use Value: Low Ciss/Crss ratio reduces EMI generation, easing compliance with EN55015 Class B conducted emissions limits. |
Use Scenario: 48 V telecom rectifier module with wide input range (85–305 VAC). IC Role / Device Role: Primary-side switch in dual-switch forward or half-bridge configuration. Use Value: 2.78 °C/W Rthj-case allows sustained 5 A operation at 85°C ambient when mounted on aluminum baseplate, supporting long-life field deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage power MOSFET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STP7NM50N | Same die, TO-220 (non-isolated tab); Rthj-case = 2.78 °C/W but requires insulating washer for heatsink mounting. | Preferred where mechanical mounting simplicity outweighs isolation needs; unsuitable for double-insulated safety-critical designs. | Select when cost-sensitive and board-level isolation is managed elsewhere; verify creepage/clearance compliance per IEC 62368-1. |
| STF10NM50N | Higher VDSS (550 V), same RDS(on) (0.70 Ω), higher Qg (16 nC), same TO-220FP package. | Better surge margin for 400 VAC industrial inputs; trade-off is increased gate drive loss and slower switching. | Choose for applications requiring >500 V breakdown margin (e.g., 480 VAC systems) where 4 ns longer td(off) is acceptable. |
Compared with STF7NM50N, STP7NM50N offers identical electrical performance but lacks built-in isolation - requiring additional insulation hardware - while STF10NM50N trades 50 V extra breakdown for 33% higher gate charge, impacting high-frequency efficiency and driver sizing.
Availability
STF7NM50N is available at Aetrix Electronics and suitable for AC/DC adapters, flyback converters, and industrial SMPS requiring stable component supply with legacy industrial lifecycle support.
Supply support for STF7NM50N 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.
STF7NM50N belongs to ST's MDmesh™ Power MOSFET product line, engineered specifically for high-efficiency, high-voltage switching power supplies - emphasizing low RDS(on) × Qg FoM and rugged avalanche capability in cost-sensitive applications.
FAQ
What is the maximum continuous drain current for STF7NM50N at 100°C case temperature?
The maximum continuous drain current is 3 A at TC = 100°C, as specified in Table 1 of the datasheet. This derating reflects thermal limitations of the TO-220FP package, where junction-to-case thermal resistance (2.78 °C/W) and safe operating area constraints limit current handling at elevated temperatures.
Does STF7NM50N require a gate resistor, and what value is recommended?
Yes - a gate resistor is required to dampen ringing and control dV/dt. ST recommends RG = 4.7 Ω for standard switching tests (per Table 6). Values between 3.3 Ω and 10 Ω are typical; lower values increase switching speed but risk overshoot, while higher values reduce EMI at the cost of increased switching loss.
Can STF7NM50N be used in synchronous rectification configurations?
No - STF7NM50N is an N-channel high-side switch intended for primary-side switching only. Its body diode is not optimized for reverse conduction in secondary-side roles, and it lacks the low VSD and fast trr required for efficient synchronous rectification. Dedicated low-VF Schottky or logic-level MOSFETs are recommended for that function.
Is STF7NM50N qualified for automotive applications?
No - STF7NM50N is not automotive-grade (AEC-Q101 qualified) and is intended for industrial and consumer power supplies. Its datasheet specifies no automotive temperature range (−40°C to 150°C), no PPAP documentation, and no automotive-specific reliability testing. For automotive use, ST's STD8N50DM or similar AEC-Q101 parts should be selected.
STF7NM50N 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:
- 5A (Tc)
- Drive Voltage (Max Rds On, Min Rds On):
- 10V
- Rds On (Max) @ Id, Vgs:
- 780mOhm @ 2.5A, 10V
- Vgs(th) (Max) @ Id:
- 4V @ 250µA
- Gate Charge (Qg) (Max) @ Vgs:
- 12 nC @ 10 V
- Vgs (Max):
- ±25V
- Input Capacitance (Ciss) (Max) @ Vds:
- 400 pF @ 50 V
- FET Feature:
- -
- Power Dissipation (Max):
- 20W (Tc)
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220FP
STF7NM50N FAQ
1.How can I place an order for STF7NM50N through Aetrix?
Please submit a Request for Quotation (RFQ) for STF7NM50N 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 STF7NM50N reliable?
The price and inventory of STF7NM50N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STF7NM50N is usually 5 days.
3.What payment methods are accepted for STF7NM50N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STF7NM50N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STF7NM50N?
STF7NM50N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STF7NM50N 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 STF7NM50N?
For technical support, including STF7NM50N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STF7NM50N requirements.
6.How does Aetrix verify that STF7NM50N is sourced from the original manufacturer or authorized distributors?
All STF7NM50N 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 STF7NM50N meets industry standards.
7.What is the process for return or replacement of STF7NM50N?
All STF7NM50N units undergo pre-shipment inspection (PSI). If there is an issue with STF7NM50N, 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 STF7NM50N part is unused and in its original packaging.
Return procedure for STF7NM50N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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