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STMicroelectronics STB15NK50ZT4
- Part No.:
- STB15NK50ZT4
- Manufacturer:
- STMicroelectronics
- Category:
- FETs, MOSFETs
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
STB15NK50ZT4.pdf
- Description:
- MOSFET N-CH 500V 14A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:9,454
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Product details
Overview
STB15NK50ZT4 from STMicroelectronics is a Zener-protected N-channel SuperMESH Power MOSFET rated for 500 V drain-source voltage, 340 mΩ max RDS(on) at VGS = 10 V and ID = 7 A, with 14 A continuous drain current at TC = 25 °C. It delivers high dv/dt capability (4.5 V/ns), 100% avalanche tested operation, and low gate charge (76 nC typ.) for hard-switching in offline SMPS and industrial motor drives.
For engineers reviewing the STB15NK50ZT4 datasheet, STB15NK50ZT4 pinout, STB15NK50ZT4 application, or STB15NK50ZT4 equivalent, key selection criteria include its TO-247 package thermal resistance (RthJC = 0.78 °C/W), ESD robustness (4 kV HBM), and unclamped inductive switching performance (EAS = 300 mJ).
Technical Context
This device implements ST's SuperMESH process - an evolution of PowerMESH - to simultaneously reduce on-resistance and improve ruggedness. Its Zener-protected gate structure enables reliable operation under transient overvoltage conditions without external clamping.
The MOSFET features low intrinsic capacitance (Ciss = 2260 pF, Coss = 264 pF) and fast switching (td(off) = 62 ns, tf = 15 ns) with controlled diode recovery (trr = 428 ns, Qrr = 4.2 µC), making it suitable for high-frequency flyback and resonant converters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 500 V - Supports 400 V AC mains input with 25% safety margin in offline converters |
| RDS(on) max | 340 mΩ - Limits conduction loss to ≤ 66 W at 14 A, enabling TO-247 thermal handling |
| ID cont. | 14 A @ TC = 25 °C - Sustains full load in 300–500 W industrial power supplies |
| EAS | 300 mJ - Withstands single-pulse inductive energy without failure in unclamped tests |
| dv/dt | 4.5 V/ns - Resists false turn-on during fast voltage transients in bridge-leg configurations |
| Qg | 76 nC typ. - Reduces gate drive power and enables use with standard 1-A peak drivers |
| VGS(th) | 3.0–4.5 V - Ensures clean turn-on with 5-V logic-level gate signals |
Pinout & Package
STB15NK50ZT4 is housed in a TO-247 package with isolated tab (drain-connected), offering low thermal resistance (RthJC = 0.78 °C/W) and high power dissipation capability (PTOT = 160 W at TC = 25 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Gate) | Control terminal | Receives gate drive signal; requires < ±30 V rating and low-impedance path to minimize ringing |
| 2 (Drain) | Main high-side current path | Connected to heatsink via isolated tab; carries full switched current and withstands 500 V |
| 3 (Source) | Reference node for gate drive | Serves as return path for load current and gate drive loop; critical for stable switching |
Key Features
| Feature | Design Value |
|---|---|
| Zener-protected gate | Integrated gate-body Zener clamp eliminates need for external TVS, improving layout reliability |
| 100% avalanche tested | Each unit validated for single-pulse avalanche energy up to 300 mJ, ensuring ruggedness in inductive loads |
| Extremely high dv/dt capability | Rated 4.5 V/ns with ISD ≤ 14 A and di/dt ≤ 200 A/μs - prevents spurious turn-on in half-bridge legs |
| Minimized gate charge | 76 nC typical total gate charge reduces driver losses and simplifies gate drive design |
| Low intrinsic capacitance | Ciss = 2260 pF, Coss = 264 pF - enables higher switching frequency with lower capacitive losses |
Applications
| Industrial Motor Drives | Server PSU Primary Switch |
|---|---|
|
Use Scenario: High-voltage DC bus switching in 3-phase inverter stages for HVAC compressors and pumps. IC Role / Device Role / Timing Role: Main high-side switching element in IGBT/MOSFET-based inverter leg, operating at 16–20 kHz. Use Value: Avalanche ruggedness and 4.5 V/ns dv/dt immunity prevent shoot-through failures during rapid bus transients. |
Use Scenario: Primary-side switch in 80+ Titanium-certified 1.5 kW server power supplies. IC Role / Device Role / Timing Role: Hard-switched MOSFET in active-clamp forward or LLC resonant converter primary stage. Use Value: Low Coss (264 pF) and Qg (76 nC) reduce switching losses and gate drive complexity at 200–500 kHz. |
| Industrial UPS Systems | EV Onboard Charger Input Stage |
|
Use Scenario: Bidirectional DC-link switching in double-conversion UPS inverters handling 400–800 V DC bus. IC Role / Device Role / Timing Role: High-reliability main switch subjected to frequent line surges and battery backup transitions. Use Value: Zener-protected gate and 4 kV HBM ESD rating ensure long-term stability under repeated grid disturbances. |
Use Scenario: PFC boost switch in 6.6 kW AC/DC onboard chargers for BEVs. IC Role / Device Role / Timing Role: Continuous conduction mode (CCM) boost MOSFET operating at 65–100 kHz with 400 V output. Use Value: 340 mΩ RDS(on) limits conduction loss to < 12 W at 20 A RMS, supporting thermal design with passive cooling. |
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 |
|---|---|---|---|
| STW15NK50Z | Identical electrical specs; same die, TO-247 package, but marked W15NK50Z and shipped in tube packaging | No functional difference; identical thermal and switching behavior in PCB layout | Select when requiring ST's standard TO-247 marking and tube delivery format |
| FDPF15N50FT | RDS(on) = 380 mΩ (higher), Qg = 85 nC (higher), no Zener gate protection, lower EAS (220 mJ) | Requires external gate Zener and tighter dv/dt control in bridge designs | Acceptable where cost sensitivity outweighs ruggedness requirements and layout allows added protection |
Compared with STW15NK50Z, STB15NK50ZT4 shares identical die and performance but differs in tape-and-reel packaging and part marking; versus FDPF15N50FT, it offers superior avalanche margin, integrated gate protection, and lower switching losses - critical for mission-critical industrial power systems.
Availability
STB15NK50ZT4 is available at Aetrix Electronics and suitable for industrial motor drives, server power supplies, and EV onboard charger input stages requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for STB15NK50ZT4 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/mixed-signal ICs for industrial, automotive, and consumer markets.
STB15NK50ZT4 belongs to ST's SuperMESH Power MOSFET product line, engineered specifically for high-efficiency, high-reliability offline switching applications demanding ruggedness, low conduction loss, and fast switching in 400–800 V systems.
FAQ
Is STB15NK50ZT4 pin-compatible with STP15NK50Z?
No. STB15NK50ZT4 uses a TO-247 package with 3-pin configuration (G-D-S), while STP15NK50Z is in TO-220. Although both share identical die characteristics and electrical specs, their mechanical footprints, thermal paths, and mounting requirements differ significantly - direct PCB replacement is not possible without layout revision.
What is the maximum recommended gate resistor value for reliable switching?
For hard-switching at 100 kHz with 1-A peak gate driver, a 10 Ω series gate resistor is recommended. This balances switching speed (td(off) ≈ 62 ns) against overshoot and ringing, given the device's 76 nC Qg and low Ciss. Values above 22 Ω increase turn-off time excessively and risk thermal stress during transition.
Does STB15NK50ZT4 require external gate protection?
No. The device integrates a Zener diode between gate and source, rated to clamp transients up to ±30 V. This eliminates the need for external gate protection components in most applications, provided layout minimizes parasitic inductance in the gate loop and VGS remains within absolute maximum ratings.
Can STB15NK50ZT4 be used in synchronous rectification?
No. STB15NK50ZT4 is optimized as a high-voltage primary-side switch, not a low-side synchronous rectifier. Its body diode has relatively high VSD (1.6 V) and slow trr (428 ns), resulting in excessive conduction and recovery losses. Dedicated low-RDS(on), fast-recovery MOSFETs like STP16NF06L are preferred for secondary-side SR.
STB15NK50ZT4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- SuperMESH™
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- FET Type:
- N-Channel
- Technology:
- MOSFET (Metal Oxide)
- Drain to Source Voltage (Vdss):
- 500 V
- Current - Continuous Drain (Id) @ 25°C:
- 14A (Tc)
- Drive Voltage (Max Rds On, Min Rds On):
- 10V
- Rds On (Max) @ Id, Vgs:
- 340mOhm @ 7A, 10V
- Vgs(th) (Max) @ Id:
- 4.5V @ 100µA
- Gate Charge (Qg) (Max) @ Vgs:
- 106 nC @ 10 V
- Vgs (Max):
- ±30V
- Input Capacitance (Ciss) (Max) @ Vds:
- 2260 pF @ 25 V
- FET Feature:
- -
- Power Dissipation (Max):
- 160W (Tc)
- Operating Temperature:
- -50°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK
STB15NK50ZT4 FAQ
1.How can I place an order for STB15NK50ZT4 through Aetrix?
Please submit a Request for Quotation (RFQ) for STB15NK50ZT4 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 STB15NK50ZT4 reliable?
The price and inventory of STB15NK50ZT4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STB15NK50ZT4 is usually 5 days.
3.What payment methods are accepted for STB15NK50ZT4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STB15NK50ZT4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STB15NK50ZT4?
STB15NK50ZT4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STB15NK50ZT4 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 STB15NK50ZT4?
For technical support, including STB15NK50ZT4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STB15NK50ZT4 requirements.
6.How does Aetrix verify that STB15NK50ZT4 is sourced from the original manufacturer or authorized distributors?
All STB15NK50ZT4 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 STB15NK50ZT4 meets industry standards.
7.What is the process for return or replacement of STB15NK50ZT4?
All STB15NK50ZT4 units undergo pre-shipment inspection (PSI). If there is an issue with STB15NK50ZT4, 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 STB15NK50ZT4 part is unused and in its original packaging.
Return procedure for STB15NK50ZT4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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