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STMicroelectronics STB9NK90Z
- Part No.:
- STB9NK90Z
- Manufacturer:
- STMicroelectronics
- Category:
- FETs, MOSFETs
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
STB9NK90Z.pdf
- Description:
- MOSFET N-CH 900V 8A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:680
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Product details
Overview
STB9NK90Z from STMicroelectronics is a Zener-protected N-channel SuperMESH Power MOSFET rated for 900 V drain-source voltage, 1.3 Ω max RDS(on) at VGS = 10 V and ID = 3.6 A, and 8 A continuous drain current at TC = 25 °C. It features 4.5 V/ns peak diode recovery dv/dt capability and 100% avalanche tested ruggedness, designed for high-voltage switching in offline SMPS and industrial AC-DC converters.
For engineers reviewing the STB9NK90Z datasheet, STB9NK90Z pinout, STB9NK90Z application, or STB9NK90Z equivalent, this device requires attention to gate charge (72 nC), output capacitance (190 pF), thermal resistance (0.78 °C/W junction-to-case), and Zener-protected gate robustness in high-noise, high-dv/dt environments.
Technical Context
This MOSFET employs ST's SuperMESH process - an optimized evolution of PowerMESH - delivering reduced on-resistance while maintaining high breakdown integrity and enhanced ESD immunity (4 kV HBM). Its intrinsic Zener diode across gate-source provides built-in overvoltage protection without external components.
The device exhibits low Crss (40 pF) and Coss eq. (115 pF), enabling fast, controllable switching with minimal Miller effect. Avalanche energy rating (300 mJ single-pulse) and 8 A repetitive avalanche current support unclamped inductive load handling in flyback and resonant topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 900 V - supports primary-side switching in universal-input 85–265 VAC offline converters without derating. |
| RDS(on) max | 1.3 Ω - enables low conduction loss at 8 A DC, critical for efficiency in high-voltage PSUs. |
| Qg | 72 nC - determines gate drive power requirement and influences switching speed in hard-switched applications. |
| dv/dt capability | 4.5 V/ns - ensures reliable operation during fast voltage transients in phase-cut dimmers or motor drives. |
| EAS | 300 mJ - allows safe energy absorption during inductive turn-off events without external snubbers. |
| RthJC | 0.78 °C/W - enables high-power dissipation with moderate heatsinking in D²PAK package. |
| VGS(th) | 3.0–4.5 V - compatible with standard 10 V gate drivers; avoids false turn-on near noise margins. |
Pinout & Package
STB9NK90Z is supplied in D²PAK (TO-263) package with exposed drain tab for thermal and electrical connection. The package has three terminals: Drain (Tab), Gate (Pin 1), Source (Pin 3), with Pin 2 unused (NC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Drain (Tab) | Main high-voltage power path | Electrically and thermally connected to PCB copper pour; must be isolated from other potentials per safety creepage requirements. |
| Gate (Pin 1) | Control input | Low-impedance node requiring short, low-inductance routing; Zener-protected against ±30 V transients. |
| Source (Pin 3) | Reference return path | Common reference for gate drive and current sensing; layout must minimize source inductance to avoid oscillation. |
Key Features
| Feature | Design Value |
|---|---|
| Zener-protected gate | Integrated ±30 V gate-source clamp eliminates need for external TVS, reducing BOM count and layout area. |
| 100% avalanche tested | Every unit validated for 8 A repetitive avalanche current and 300 mJ single-pulse energy - guarantees ruggedness in real-world faults. |
| Extremely high dv/dt capability | 4.5 V/ns rating prevents spurious turn-on during rapid voltage transitions in high-frequency SMPS and lighting ballasts. |
| Minimized gate charge | 72 nC total gate charge enables efficient driving with low-power gate drivers (e.g., STMicro's STL100N10F7). |
| Very low intrinsic capacitance | Ciss = 2115 pF, Crss = 40 pF - reduces switching losses and improves EMI behavior in >100 kHz designs. |
Applications
| Industrial AC-DC Power Supplies | LED Street Lighting Drivers |
|---|---|
Use Scenario: Primary-side switch in 150–300 W flyback or quasi-resonant converter operating from 230 VAC mains. IC Role / Device Role / Timing Role: High-voltage power switch controlling energy transfer into transformer primary; operates at 65–130 kHz with zero-voltage switching. Use Value: 900 V rating allows direct connection to rectified line without series stacking; 1.3 Ω RDS(on) limits conduction loss to <1.2 W at full load. |
Use Scenario: Constant-current buck-boost LED driver for outdoor luminaires with surge immunity up to 10 kV. IC Role / Device Role / Timing Role: Main switching element in high-side configured topology; handles 8 A pulsed LED current with 32 A peak avalanche tolerance. Use Value: 4.5 V/ns dv/dt capability suppresses false triggering during lightning-induced transients; Zener gate protection withstands repeated 4 kV ESD events. |
| Phase-Cut Dimmable Ballasts | High-Voltage DC-DC Converters |
Use Scenario: Triac-compatible dimmable electronic ballast for HID lamps, interfacing with leading-edge dimmers. IC Role / Device Role / Timing Role: High-side switch synchronizing with AC zero-crossing; sustains high dv/dt during phase-angle chopping. Use Value: Robust 900 V VDS and 50 µA IDSS at 125 °C ensure stable blocking during deep dimming; low Coss eq. (115 pF) minimizes capacitive coupling noise. |
Use Scenario: Isolated DC-DC stage in telecom rectifiers converting 400 VDC bus to 48 VDC output. IC Role / Device Role / Timing Role: Primary-side switch in forward or active-clamp forward topology; operates with synchronous rectification on secondary side. Use Value: 0.78 °C/W RthJC allows 160 W dissipation with modest heatsink; avalanche rating supports fault clearing during output short-circuit events. |
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 |
|---|---|---|---|
| STP9NK90Z | Same die, TO-220 package; RthJC = 0.78 °C/W but larger footprint and higher RthJA (62.5 °C/W). | Better suited for through-hole prototyping or lower-density layouts where D²PAK reflow is impractical. | Select when manual assembly, mechanical robustness, or legacy board compatibility outweigh surface-mount density benefits. |
| STW9NK90Z | Same die, TO-247 package; identical RDS(on) and Qg, but RthJC = 0.78 °C/W and RthJA = 50 °C/W. | Preferred for high-reliability industrial systems requiring maximum thermal margin and field-serviceable replacement. | Choose for high-power (>250 W), forced-air-cooled applications where TO-247 mechanical stability and heatsink interface are critical. |
Compared with STP9NK90Z and STW9NK90Z, STB9NK90Z offers optimal power density and automated assembly compatibility in D²PAK, while maintaining identical electrical performance - making it ideal for space-constrained, high-volume SMPS designs.
Availability
STB9NK90Z is available at Aetrix Electronics and suitable for industrial AC-DC power supplies, LED street lighting drivers, and phase-cut dimmable ballasts requiring stable component supply and long-term lifecycle assurance.
Supply support for STB9NK90Z 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 microcontrollers, power devices, sensors, and analog ICs for automotive, industrial, and consumer markets.
This device belongs to ST's SuperMESH Power MOSFET product line - engineered specifically for high-efficiency, high-reliability switching in 600–1000 V offline power conversion systems.
FAQ
What is the maximum gate-source voltage rating for STB9NK90Z?
The absolute maximum VGS is ±30 V, enforced by an integrated Zener diode between gate and source. This protection remains effective across temperature (–55 °C to 150 °C) and eliminates need for external clamping components in most designs.
Does STB9NK90Z require a gate resistor for reliable operation?
Yes - a gate resistor (typically 10–47 Ω) is required to dampen ringing caused by parasitic inductance and control dV/dt during turn-on/turn-off. The 72 nC gate charge and low Crss make it sensitive to layout-induced oscillation without proper gate resistance.
Can STB9NK90Z replace older STP9NK90Z in existing TO-220 designs?
No - STB9NK90Z uses D²PAK (TO-263) packaging with different pad layout, thermal pad connection, and mounting method. Direct replacement requires PCB redesign; however, electrical parameters (VDS, RDS(on), Qg) are identical, enabling functional equivalence after layout adaptation.
What is the safe operating area (SOA) limitation at 100 °C case temperature?
At TC = 100 °C, the continuous drain current is derated to 5 A (per Table 1), and the SOA is bounded by both thermal limits and second breakdown. Pulse operation up to 32 A is allowed only if pulse width and duty cycle comply with the SOA curves in Figures 1 and 5 of DS3287 Rev 8.
STB9NK90Z 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:
- Active
- FET Type:
- N-Channel
- Technology:
- MOSFET (Metal Oxide)
- Drain to Source Voltage (Vdss):
- 900 V
- Current - Continuous Drain (Id) @ 25°C:
- 8A (Tc)
- Drive Voltage (Max Rds On, Min Rds On):
- 10V
- Rds On (Max) @ Id, Vgs:
- 1.3Ohm @ 3.6A, 10V
- Vgs(th) (Max) @ Id:
- 4.5V @ 100µA
- Gate Charge (Qg) (Max) @ Vgs:
- 72 nC @ 10 V
- Vgs (Max):
- ±30V
- Input Capacitance (Ciss) (Max) @ Vds:
- 2115 pF @ 25 V
- FET Feature:
- -
- Power Dissipation (Max):
- 160W (Tc)
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK
STB9NK90Z FAQ
1.How can I place an order for STB9NK90Z through Aetrix?
Please submit a Request for Quotation (RFQ) for STB9NK90Z 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 STB9NK90Z reliable?
The price and inventory of STB9NK90Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STB9NK90Z is usually 5 days.
3.What payment methods are accepted for STB9NK90Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STB9NK90Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STB9NK90Z?
STB9NK90Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STB9NK90Z 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 STB9NK90Z?
For technical support, including STB9NK90Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STB9NK90Z requirements.
6.How does Aetrix verify that STB9NK90Z is sourced from the original manufacturer or authorized distributors?
All STB9NK90Z 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 STB9NK90Z meets industry standards.
7.What is the process for return or replacement of STB9NK90Z?
All STB9NK90Z units undergo pre-shipment inspection (PSI). If there is an issue with STB9NK90Z, 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 STB9NK90Z part is unused and in its original packaging.
Return procedure for STB9NK90Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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