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STMicroelectronics STD2NK90Z-1
- Part No.:
- STD2NK90Z-1
- Manufacturer:
- STMicroelectronics
- Category:
- FETs, MOSFETs
- Package:
- TO-251-3 Short Leads, IPAK, TO-251AA
- Datasheet:
-
STD2NK90Z-1.pdf
- Description:
- MOSFET N-CH 900V 2.1A IPAK
- Quantity:
- Payment:
- Shipping:
Inventory:860
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Product details
Overview
STD2NK90Z-1 from STMicroelectronics is a Zener-protected N-channel SuperMESH Power MOSFET rated for 900 V drain-source voltage, 4.7 Ω typical RDS(on), and 2.1 A continuous drain current at TC = 25 °C. It features 100% avalanche testing, minimized gate charge (19.5–27 nC), and ultra-low output capacitance (Coss = 50 pF), enabling high-voltage flyback and resonant SMPS designs in industrial power supplies.
For engineers reviewing the STD2NK90Z-1 datasheet, STD2NK90Z-1 pinout, STD2NK90Z-1 application, or STD2NK90Z-1 equivalent, key selection criteria include its 900 V VDS, 1.78 °C/W RthJC, 4.5 V/ns dv/dt capability, 150 mJ single-pulse avalanche energy, and DPAK (TO-252) thermal performance under continuous conduction mode.
Technical Context
This device implements ST's SuperMESH process - an evolution of PowerMESH - delivering reduced on-resistance while maintaining robust dv/dt immunity (4.5 V/ns) and intrinsic Zener gate protection. Its low Ciss (485 pF) and Crss (10 pF) support fast switching with minimal Miller effect in hard-switched topologies.
The integrated source-drain diode exhibits 1.6 V forward voltage at 2.1 A and 415 ns reverse recovery time (TJ = 25 °C), making it suitable for self-oscillating flyback converters where body diode conduction occurs during reset phase.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 900 V - supports primary-side switching in universal-input offline SMPS up to 380 V DC bus with margin. |
| RDS(on) max | 6.5 Ω - defines conduction loss at full load; typ. 4.7 Ω enables <1.5 W I²R loss at 2.1 A. |
| Qg | 19.5–27 nC - determines gate drive power and switching speed; low value reduces driver stress in high-frequency operation. |
| EAS | 150 mJ - ensures reliable unclamped inductive switching survival without external snubbers in flyback designs. |
| RthJC | 1.78 °C/W - enables 70 W dissipation with modest heatsinking; critical for thermally constrained PCB layouts. |
| dv/dt rating | 4.5 V/ns - prevents spurious turn-on in high-noise environments like motor drives or PFC stages. |
| Coss | 50 pF - minimizes capacitive turn-off losses and improves efficiency in quasi-resonant converters. |
Pinout & Package
DPAK (TO-252) package with exposed drain tab for thermal and electrical connection; surface-mount, single-ended layout optimized for high-voltage isolation and PCB heat spreading.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (G) | Gate | Control terminal; accepts 10 V logic-level drive; Zener-protected ±30 V rating prevents ESD damage. |
| 2 (D / TAB) | Drain / Thermal Pad | Main high-voltage output node; electrically and thermally connected to large copper area on PCB. |
| 3 (S) | Source | Reference node for gate drive; connects to ground or current-sense resistor in low-side configuration. |
Key Features
| Feature | Design Value |
|---|---|
| 100% avalanche tested | Guarantees ruggedness in unclamped inductive switching; eliminates need for external clamping circuits in flyback transformers. |
| SuperMESH technology | Delivers 25% lower RDS(on) vs prior PowerMESH generation while preserving breakdown integrity and switching speed. |
| Zener-protected gate | Integrated bidirectional 30 V Zener clamp protects against gate oxide rupture during layout transients or hot-plug events. |
| Low Ciss/Crss ratio | 485 pF / 10 pF = 48.5 - suppresses Miller-induced oscillation and enables stable operation with moderate gate resistance (4.7 Ω). |
Applications
| Industrial Flyback SMPS | AC-DC Adapter Primary Switch |
|---|---|
Use Scenario: 24–48 V output, 30 W isolated power supply for PLC I/O modules operating across -40 to +85 °C ambient. IC Role / Device Role / Timing Role: High-voltage primary-side switch in discontinuous conduction mode (DCM) flyback topology. Use Value: 150 mJ EAS withstands transformer leakage inductance spikes; 4.5 V/ns dv/dt prevents false triggering during line surges. |
Use Scenario: Universal-input (90–264 V AC), 12 V/2.5 A wall adapter for medical monitoring equipment requiring reinforced isolation. IC Role / Device Role / Timing Role: Self-oscillating flyback switch with integrated body diode conducting during transformer reset. Use Value: 1.6 V VSD and 415 ns trr minimize reset losses; Zener gate protection meets IEC 60601-1 surge immunity requirements. |
| LED Driver – Isolated Buck-Boost | High-Voltage DC-DC Converter |
Use Scenario: Constant-current 48 V LED string driver for street lighting, operating in outdoor enclosures with wide temperature swings. IC Role / Device Role / Timing Role: Primary-side switch in active-clamp forward-derived topology handling 400 V DC input. Use Value: 900 V VDS provides 2× safety margin over 400 V bus; low Coss enables >100 kHz operation with minimal switching loss. |
Use Scenario: 400 V to 24 V isolated DC-DC module for railway signaling systems requiring long-term reliability and no maintenance. IC Role / Device Role / Timing Role: Main switching element in half-bridge LLC resonant converter primary leg. Use Value: 1.78 °C/W RthJC allows full 2.1 A current derating at 100 °C case temperature; 8.4 A pulsed ID supports peak-load transients. |
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 |
|---|---|---|---|
| STP2NK90Z | TO-220 package; identical electrical specs but higher RthJA (60 °C/W vs 50 °C/W) and no tape-and-reel option. | Better suited for prototyping or low-volume heatsink-mounted designs; not SMT-compatible. | Select when manual assembly or discrete heatsinking is preferred over automated PCB assembly. |
| FQP9N90C | 900 V, 8.5 Ω RDS(on) max, 2.5 A ID, higher Qg (32 nC), no Zener gate protection. | Lacks integrated gate protection and has 30% higher conduction loss; requires external gate clamp. | Choose only if cost sensitivity outweighs reliability requirements and board space permits external protection components. |
Compared with STP2NK90Z and FQP9N90C, STD2NK90Z-1 offers superior manufacturability (DPAK tape-and-reel), guaranteed avalanche ruggedness, and integrated gate protection - critical for production-grade industrial power supplies where field failure modes must be eliminated at component level.
Availability
STD2NK90Z-1 is available at Aetrix Electronics and suitable for industrial flyback SMPS, AC-DC adapters, and high-voltage DC-DC converters requiring stable component supply, long-lifecycle assurance, and consistent parametric performance across production batches.
Supply support for STD2NK90Z-1 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.
STD2NK90Z-1 belongs to ST's SuperMESH Power MOSFET product line, engineered specifically for high-efficiency, high-reliability offline power conversion in space-constrained industrial and medical power supplies.
FAQ
What is the maximum safe operating junction temperature for STD2NK90Z-1?
The device is rated for TJ = 150 °C maximum, with derated current capability above TC = 25 °C. At TC = 100 °C, continuous drain current drops to 1.3 A per absolute maximum ratings table. Thermal design must maintain junction temperature below this limit using the specified RthJC = 1.78 °C/W path to heatsink or PCB copper.
Does STD2NK90Z-1 require an external gate resistor for stability?
Yes - a 4.7 Ω gate resistor is recommended per the datasheet's resistive load switching test circuit. This value balances switching speed (21 ns td(on), 43 ns td(off)) against ringing suppression and gate driver stress, especially given its low Crss (10 pF) and high dv/dt immunity.
Can STD2NK90Z-1 replace STD2NK90ZT4 in existing designs?
Yes - STD2NK90Z-1 and STD2NK90ZT4 are functionally identical; the "-1" suffix denotes a specific tape-and-reel packaging variant per ST's internal ordering system. Electrical characteristics, package dimensions, pinout, and thermal data are fully interchangeable.
Is the body diode suitable for continuous conduction in synchronous rectification?
No - the source-drain diode is optimized for flyback reset, not synchronous rectification. Its 1.6 V forward drop and 415 ns trr cause excessive conduction and recovery losses above ~50 kHz. External Schottky or MOSFET synchronous rectifiers are required for high-efficiency secondary-side regulation.
STD2NK90Z-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- SuperMESH™
- Package/Case:
- TO-251-3 Short Leads, IPAK, TO-251AA
- 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:
- 2.1A (Tc)
- Drive Voltage (Max Rds On, Min Rds On):
- 10V
- Rds On (Max) @ Id, Vgs:
- 6.5Ohm @ 1.05A, 10V
- Vgs(th) (Max) @ Id:
- 4.5V @ 50µA
- Gate Charge (Qg) (Max) @ Vgs:
- 27 nC @ 10 V
- Vgs (Max):
- ±30V
- Input Capacitance (Ciss) (Max) @ Vds:
- 485 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:
- IPAK
STD2NK90Z-1 FAQ
1.How can I place an order for STD2NK90Z-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for STD2NK90Z-1 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 STD2NK90Z-1 reliable?
The price and inventory of STD2NK90Z-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STD2NK90Z-1 is usually 5 days.
3.What payment methods are accepted for STD2NK90Z-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STD2NK90Z-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STD2NK90Z-1?
STD2NK90Z-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STD2NK90Z-1 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 STD2NK90Z-1?
For technical support, including STD2NK90Z-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STD2NK90Z-1 requirements.
6.How does Aetrix verify that STD2NK90Z-1 is sourced from the original manufacturer or authorized distributors?
All STD2NK90Z-1 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 STD2NK90Z-1 meets industry standards.
7.What is the process for return or replacement of STD2NK90Z-1?
All STD2NK90Z-1 units undergo pre-shipment inspection (PSI). If there is an issue with STD2NK90Z-1, 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 STD2NK90Z-1 part is unused and in its original packaging.
Return procedure for STD2NK90Z-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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