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STMicroelectronics STF9NK90Z
- Part No.:
- STF9NK90Z
- Manufacturer:
- STMicroelectronics
- Category:
- FETs, MOSFETs
- Package:
- TO-220-3 Full Pack
- Datasheet:
-
STF9NK90Z.pdf
- Description:
- MOSFET N-CH 900V 8A TO220FP
- Quantity:
- Payment:
- Shipping:
Inventory:947
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Product details
Overview
STF9NK90Z 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, deployed in high-voltage switching power supplies and industrial motor drives.
For engineers reviewing the STF9NK90Z datasheet, STF9NK90Z pinout, STF9NK90Z application, or STF9NK90Z equivalent, this device is selected for high-reliability flyback converters, resonant LLC stages, and AC-DC front-end PFC circuits where high-voltage blocking, low gate charge (72 nC), and robust unclamped inductive switching performance are required.
Technical Context
This MOSFET employs ST's SuperMESH process - an evolution of PowerMESH - delivering reduced on-resistance while maintaining high dv/dt immunity (4.5 V/ns) and enhanced ESD tolerance (4 kV HBM). Its Zener-protected gate structure enables stable operation under transient overvoltage conditions without external clamping.
The device exhibits low intrinsic capacitance (Ciss = 2115 pF, Coss = 190 pF, Crss = 40 pF) and fast switching dynamics (td(on) = 22 ns, tf = 28 ns), optimized for hard-switched and resonant topologies operating up to 100 kHz with minimal switching loss.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 900 V - Supports primary-side switching in universal-input offline SMPS up to 400 VAC mains with margin. |
| RDS(on) max | 1.3 Ω - Enables <10.4 W conduction loss at 8 A DC, suitable for medium-power (<500 W) converters. |
| Qg | 72 nC - Low gate drive energy reduces controller IC loading and allows use with standard 1-A gate drivers. |
| EAS | 300 mJ - Withstands single-pulse inductive energy events without failure, critical for relay/snubberless designs. |
| dv/dt rating | 4.5 V/ns - Prevents false turn-on during high-slew-rate transients in bridge-leg or phase-shifted topologies. |
| TJ max | 150 °C - Allows operation in sealed industrial enclosures with limited airflow and thermal derating to 5 A at 100 °C case temp. |
| Coss eq. | 115 pF - Low effective output capacitance minimizes dead-time losses and improves zero-voltage switching (ZVS) initiation. |
Pinout & Package
STF9NK90Z is housed in a TO-220FP (Full-Pak) package with insulated tab, enabling direct mounting to heatsinks without isolation hardware. The plastic body provides creepage/clearance compliance for reinforced insulation in Class II systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D (Drain, Pin 2 & Tab) | Main high-voltage current path | Tab is electrically connected to drain - requires insulated mounting or clearance ≥4 mm to adjacent conductors. |
| G (Gate, Pin 1) | Control electrode | High-impedance input requiring <100 pF layout routing to avoid oscillation; Zener-clamped to ±30 V. |
| S (Source, Pin 3) | Reference node for gate drive | Low-inductance source return path essential for stable switching; ties to power ground in non-isolated topologies. |
Key Features
| Feature | Design Value |
|---|---|
| Zener-protected gate | Integrated bidirectional 30 V clamp eliminates need for external gate protection diodes in noisy environments. |
| 100% avalanche tested | Each unit validated for single-pulse EAS = 300 mJ - guarantees ruggedness in unclamped inductive switching. |
| Extremely high dv/dt capability | 4.5 V/ns rating ensures immunity to parasitic turn-on during fast voltage transitions in half-bridge configurations. |
| Minimized gate charge | 72 nC total Qg reduces driver power dissipation and enables higher-frequency operation with lower gate drive loss. |
| Very low intrinsic capacitance | Ciss/Coss/Crss values optimize efficiency in soft-switching topologies and reduce EMI generation. |
Applications
| Industrial Flyback SMPS | AC-DC PFC Stage |
|---|---|
|
Use Scenario: 300–500 W offline flyback converter for PLC power modules with universal AC input (85–265 VAC). IC Role / Device Role / Timing Role: Primary-side high-voltage switch handling full input rectified voltage (up to 375 VDC) and delivering isolated output via transformer coupling. Use Value: 900 V VDS rating provides 2× safety margin over peak line voltage; 300 mJ EAS withstands transformer leakage inductance spikes without snubber. |
Use Scenario: Boost-type active PFC front-end in industrial UPS systems operating continuously at 230 VAC nominal input. IC Role / Device Role / Timing Role: High-side boost switch controlling inductor current to shape input current waveform and regulate 400 VDC bus. Use Value: 4.5 V/ns dv/dt immunity prevents spurious turn-on during zero-crossing commutation; low Coss eq. (115 pF) reduces turn-off loss at 65 kHz switching frequency. |
| Resonant LLC Converter | Motor Drive Inverter Stage |
|
Use Scenario: Secondary-side synchronous rectification and primary-side half-bridge in 600 W server PSU LLC resonant converter. IC Role / Device Role / Timing Role: Half-bridge leg switch operating in ZVS mode with body diode conduction during dead time. Use Value: Low Qgd/Qgs ratio (38 nC / 14 nC) enables precise ZVS timing control; 1.6 V VSD forward drop minimizes body-diode conduction loss. |
Use Scenario: High-voltage DC link switching in 3-phase inverter for HVAC compressor drives (200–400 VDC bus). IC Role / Device Role / Timing Role: Upper-leg IGBT replacement in 600 V-class inverters requiring fast, rugged unidirectional switching. Use Value: 8 A continuous current and 32 A pulsed rating support 10:1 overload peaks; TO-220FP insulated tab simplifies heatsink integration in compact drive modules. |
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 (non-insulated tab); RthJC = 0.78 °C/W vs. 3.1 °C/W for STF9NK90Z. | Requires insulating washer for heatsink mounting; better thermal performance but higher assembly cost and safety validation burden. | Select when thermal budget is tight and isolation can be implemented externally. |
| FQP9N90C | 900 V, 1.4 Ω RDS(on), 72 nC Qg, but no Zener gate protection or 100% avalanche test screening. | Lacks guaranteed ESD and avalanche ruggedness - unsuitable for mission-critical industrial or medical equipment. | Acceptable only for cost-sensitive consumer-grade designs with controlled EMI environments and external gate clamping. |
Compared with STP9NK90Z, STF9NK90Z trades 2.32 °C/W higher junction-to-case thermal resistance for simplified, safer heatsink integration; versus FQP9N90C, it delivers verified ruggedness at the cost of slightly higher RDS(on) and premium qualification screening.
Availability
STF9NK90Z is available at Aetrix Electronics and suitable for industrial power supplies, AC-DC front-ends, and motor drive inverters requiring stable component supply across multi-year production cycles and extended lifecycle planning.
Supply support for STF9NK90Z 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 automotive, industrial, and consumer markets.
This device belongs to ST's SuperMESH Power MOSFET product line - engineered specifically for high-efficiency, high-reliability offline power conversion where voltage rating, avalanche robustness, and dv/dt immunity are design-critical.
FAQ
Is STF9NK90Z pin-compatible with STP9NK90Z?
Yes - both share identical TO-220 footprint and pinout (D-G-S = Pin 2-1-3), but STF9NK90Z uses the TO-220FP variant with insulated tab, whereas STP9NK90Z uses standard TO-220 with conductive tab. Mechanical mounting and isolation requirements differ accordingly.
What is the maximum recommended gate resistor value for reliable switching?
A 4.7 Ω gate resistor is specified in the datasheet for switching time characterization (VDD = 450 V, ID = 4 A). For 72 nC Qg, values up to 10 Ω maintain safe dV/dt control without excessive turn-on delay; above 15 Ω risks incomplete turn-on during short pulses.
Does STF9NK90Z require external gate protection diodes?
No - its integrated Zener protection clamps gate-source voltage to ±30 V, eliminating the need for external TVS or diode clamps in typical industrial switching applications. External protection remains advisable only in extreme ESD-prone environments exceeding 4 kV HBM.
Can STF9NK90Z replace STW9NK90Z in TO-247-based designs?
No - although electrically identical, STW9NK90Z uses TO-247 (RthJC = 0.78 °C/W) versus STF9NK90Z's TO-220FP (RthJC = 3.1 °C/W). Substitution would cause >3× higher junction temperature rise at same power dissipation, risking thermal runaway without board-level redesign.
STF9NK90Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- SuperMESH™
- Package/Case:
- TO-220-3 Full Pack
- Packaging:
- Tube
- 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):
- 40W (Tc)
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220FP
STF9NK90Z FAQ
1.How can I place an order for STF9NK90Z through Aetrix?
Please submit a Request for Quotation (RFQ) for STF9NK90Z 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 STF9NK90Z reliable?
The price and inventory of STF9NK90Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STF9NK90Z is usually 5 days.
3.What payment methods are accepted for STF9NK90Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STF9NK90Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STF9NK90Z?
STF9NK90Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STF9NK90Z 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 STF9NK90Z?
For technical support, including STF9NK90Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STF9NK90Z requirements.
6.How does Aetrix verify that STF9NK90Z is sourced from the original manufacturer or authorized distributors?
All STF9NK90Z 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 STF9NK90Z meets industry standards.
7.What is the process for return or replacement of STF9NK90Z?
All STF9NK90Z units undergo pre-shipment inspection (PSI). If there is an issue with STF9NK90Z, 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 STF9NK90Z part is unused and in its original packaging.
Return procedure for STF9NK90Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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