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STMicroelectronics STP5NK50Z
- Part No.:
- STP5NK50Z
- Manufacturer:
- STMicroelectronics
- Category:
- FETs, MOSFETs
- Package:
- TO-220-3
- Datasheet:
-
STP5NK50Z.pdf
- Description:
- MOSFET N-CH 500V 4.4A TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,589
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Product details
Overview
STP5NK50Z from STMicroelectronics is a Zener-protected N-channel 500 V, 1.22 Ω typ. (1.5 Ω max.), 4.4 A SuperMESH™ Power MOSFET in TO-220 package, designed for high-voltage switching in offline SMPS, AC-DC adapters, and lighting ballasts where avalanche ruggedness and low gate charge are critical.
For engineers reviewing the STP5NK50Z datasheet, STP5NK50Z pinout, STP5NK50Z application, or STP5NK50Z equivalent, key selection criteria include its 100% avalanche-tested capability, 20 nC typical gate charge, 4.5 V/ns dv/dt rating, built-in gate-source Zener protection, and thermal resistance of 1.78 °C/W (junction-to-case).
Technical Context
This device employs ST's SuperMESH™ process - an evolution of PowerMESH™ - to simultaneously reduce RDS(on) and intrinsic capacitance while maintaining high dv/dt immunity. Its optimized cell layout enables stable operation under fast transient conditions without external snubbers.
The integrated back-to-back gate-source Zener diodes provide ±30 V breakdown protection, eliminating need for external ESD clamps. The source-drain diode supports 4.4 A continuous and 17.6 A pulsed conduction with 310 ns reverse recovery time at 150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 500 V - Supports primary-side switching in universal-input (85–265 VAC) offline converters without derating. |
| RDS(on) max | 1.5 Ω - Enables <1.5 W conduction loss at 4.4 A, suitable for 30–60 W power stages. |
| Qg typ | 20 nC - Reduces gate drive power and enables use with low-current controllers like UC384x. |
| EAS | 130 mJ - Guarantees single-pulse avalanche robustness during inductive turn-off transients. |
| Rthj-case | 1.78 °C/W - Allows 70 W dissipation at 25 °C case temperature with standard heatsink mounting. |
| dv/dt rating | 4.5 V/ns - Ensures noise-immune operation in high-frequency flyback and resonant topologies. |
| V(BR)GSO | ±30 V - Built-in bidirectional Zener clamping protects gate oxide from ESD and Miller-induced overvoltage. |
Pinout & Package
STP5NK50Z uses TO-220 package (Type A), with tab connected to drain (D). Standard 3-pin through-hole mounting supports direct heatsinking via insulating washer or isolated clip.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Left) | Gate (G) | High-impedance control input; requires ≤10 V drive for full enhancement; sensitive to ESD. |
| 2 (Center) | Drain (D) | Main high-voltage power terminal; electrically connected to metal tab for thermal and electrical path to heatsink. |
| 3 (Right) | Source (S) | Power return node; referenced to ground in low-side switch configuration; carries full load current. |
Key Features
| Feature | Design Value |
|---|---|
| 100% avalanche tested | Every unit validated for 130 mJ single-pulse energy at Tj = 25 °C - ensures field reliability in unclamped inductive switching. |
| Minimized gate charge | 20 nC typical Qg reduces driver losses and enables >100 kHz operation without excessive gate drive power. |
| Very low Coss eq. | 45 pF equivalent output capacitance minimizes turn-off losses and improves light-load efficiency in flyback converters. |
| Zener-protected gate | Integrated ±30 V gate-source Zener eliminates need for external TVS, reducing BOM count and PCB area in cost-sensitive designs. |
| High dv/dt immunity | 4.5 V/ns rated slope prevents false turn-on during voltage transients - critical for high-side or half-bridge configurations. |
Applications
| Offline AC-DC Adapters | Flyback SMPS |
|---|---|
|
Use Scenario: 24 V/2.5 A universal-input adapter for industrial sensors. IC Role / Device Role / Timing Role: Primary-side N-channel switch operating at 65 kHz in discontinuous conduction mode. Use Value: 1.22 Ω RDS(on) limits conduction loss to 1.2 W at full load; 130 mJ EAS absorbs leakage inductance spikes without snubber. |
Use Scenario: 12 V/5 A LED driver for street lighting with wide input range. IC Role / Device Role / Timing Role: High-voltage switch controlling transformer primary in quasi-resonant flyback topology. Use Value: 4.5 V/ns dv/dt rating prevents spurious turn-on during valley switching; TO-220 tab enables direct heatsink attachment for ambient up to 70 °C. |
| Electronic Ballasts | Industrial Motor Starters |
|
Use Scenario: 36 W fluorescent lamp ballast with active PFC front-end. IC Role / Device Role / Timing Role: Half-bridge low-side switch driven by IR2153 controller. Use Value: Gate Zener protection withstands Miller coupling from high dV/dt across bridge; 17.6 A pulsed ID supports inrush current during lamp ignition. |
Use Scenario: 1 HP AC motor soft-starter using phase-angle control. IC Role / Device Role / Timing Role: Main switching element in series with motor winding, triggered by zero-crossing TRIAC driver. Use Value: 500 V VDS safely blocks line voltage peaks (375 VDC after rectification); 1.78 °C/W Rthj-case sustains 2.7 A continuous current at 100 °C case temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage N-channel MOSFET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STP6NK60Z | 600 V VDS, 1.35 Ω RDS(on) max, same TO-220 package | Higher voltage rating suits 400 V DC bus systems; slightly lower on-resistance improves efficiency above 30 W | Select when designing for 380–400 V DC input or requiring margin against line surges beyond 500 V |
| FQP5N50 | 500 V VDS, 1.4 Ω RDS(on) max, no built-in Zener, higher Qg (32 nC) | Lacks gate protection and avalanche testing; requires external gate clamp; higher drive loss | Acceptable only in cost-driven, low-reliability consumer applications with controlled ESD environment and soft-switching topologies |
Compared with STP5NK50Z, STP6NK60Z offers higher voltage headroom at similar RDS(on), while FQP5N50 sacrifices Zener protection and avalanche ruggedness for lower unit cost - making STP5NK50Z optimal for industrial-grade offline power where robustness is non-negotiable.
Availability
STP5NK50Z is available at Aetrix Electronics and suitable for offline AC-DC adapters, flyback SMPS, and electronic ballasts requiring stable component supply across long production cycles.
Supply support for STP5NK50Z 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, specializing in power management, microcontrollers, and analog ICs for industrial, automotive, and consumer markets.
STP5NK50Z belongs to the SuperMESH™ Power MOSFET product line, engineered specifically for high-efficiency, high-reliability switching in 500 V-class offline power conversion systems.
FAQ
Is STP5NK50Z pin-compatible with other TO-220 N-channel MOSFETs?
Yes - STP5NK50Z follows standard TO-220 Type A pinout (G-D-S, left-to-right with tab facing outward), matching industry conventions used by ST's STD/STB/STU series and most third-party 500 V MOSFETs. Mechanical compatibility with existing footprints is confirmed per Table 13 in DS2834 Rev 6.
Does STP5NK50Z require external gate protection?
No - it integrates bidirectional gate-source Zener diodes rated at ±30 V, verified per Table 8 in the datasheet. This eliminates need for external TVS devices in typical applications, provided gate drive voltage stays within ±20 V and layout avoids excessive inductance in gate loop.
What is the maximum continuous drain current at 100 °C case temperature?
The datasheet specifies 2.7 A continuous drain current (ID) at TC = 100 °C, limited by junction temperature (Tj ≤ 150 °C) and safe operating area constraints. Derating curves in Figure 1 confirm this value applies to both TO-220 and I2PAK packages.
Can STP5NK50Z be used in synchronous rectification?
No - it is a standard N-channel enhancement-mode MOSFET with body diode characteristics optimized for switching, not reverse conduction. Its source-drain diode has 310 ns trr and 9.2 A IRRM, making it unsuitable for high-frequency synchronous rectification where fast recovery or low VF is required.
STP5NK50Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- SuperMESH™
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Active
- FET Type:
- N-Channel
- Technology:
- MOSFET (Metal Oxide)
- Drain to Source Voltage (Vdss):
- 500 V
- Current - Continuous Drain (Id) @ 25°C:
- 4.4A (Tc)
- Drive Voltage (Max Rds On, Min Rds On):
- 10V
- Rds On (Max) @ Id, Vgs:
- 1.5Ohm @ 2.2A, 10V
- Vgs(th) (Max) @ Id:
- 4.5V @ 50µA
- Gate Charge (Qg) (Max) @ Vgs:
- 28 nC @ 10 V
- Vgs (Max):
- ±30V
- Input Capacitance (Ciss) (Max) @ Vds:
- 535 pF @ 25 V
- FET Feature:
- -
- Power Dissipation (Max):
- 70W (Tc)
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
STP5NK50Z FAQ
1.How can I place an order for STP5NK50Z through Aetrix?
Please submit a Request for Quotation (RFQ) for STP5NK50Z 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 STP5NK50Z reliable?
The price and inventory of STP5NK50Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STP5NK50Z is usually 5 days.
3.What payment methods are accepted for STP5NK50Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STP5NK50Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STP5NK50Z?
STP5NK50Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STP5NK50Z 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 STP5NK50Z?
For technical support, including STP5NK50Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STP5NK50Z requirements.
6.How does Aetrix verify that STP5NK50Z is sourced from the original manufacturer or authorized distributors?
All STP5NK50Z 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 STP5NK50Z meets industry standards.
7.What is the process for return or replacement of STP5NK50Z?
All STP5NK50Z units undergo pre-shipment inspection (PSI). If there is an issue with STP5NK50Z, 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 STP5NK50Z part is unused and in its original packaging.
Return procedure for STP5NK50Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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