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STMicroelectronics STD2NK70ZT4
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- Part No.:
- STD2NK70ZT4
- Manufacturer:
- STMicroelectronics
- Category:
- FETs, MOSFETs
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
STD2NK70ZT4.pdf
- Description:
- MOSFET N-CH 700V 1.6A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:6,279
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Product details
Overview
STD2NK70ZT4 from STMicroelectronics is an N-channel 700 V, 6 Ω RDS(on), 1.6 A SuperMESH™ MOSFET in DPAK (TO-252) package, featuring integrated gate-source Zener protection, 100% avalanche tested, and optimized for high dv/dt capability in flyback SMPS for monitors, industrial power supplies, and battery chargers.
For engineers reviewing the STD2NK70ZT4 datasheet, STD2NK70ZT4 pinout, STD2NK70ZT4 application, or STD2NK70ZT4 equivalent, key selection criteria include its 700 V VDSS, 6 Ω typ. RDS(on), 11.4 nC total gate charge, 4.5 V/ns dv/dt rating, and built-in ±30 V gate protection - all critical for reliable high-voltage switching in compact flyback topologies.
Technical Context
This MOSFET employs ST's SuperMESH™ layout-optimized strip-based PowerMESH™-to simultaneously reduce RDS(on) and enhance ruggedness. Its 700 V breakdown voltage and 4.5 V/ns dv/dt rating enable stable operation under fast transient conditions in discontinuous conduction mode (DCM) flyback converters.
The integrated back-to-back gate-source Zener diodes clamp at ±30 V, eliminating external protection components while supporting robust ESD immunity (2000 V HBM) and safe absorption of gate transients during layout parasitic ringing or driver mismatch.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDSS | 700 V - Withstands full mains-referred DC bus in universal-input flyback designs up to 265 VAC. |
| RDS(on) (typ) | 6 Ω @ VGS = 10 V, ID = 0.8 A - Enables low conduction loss at 1.6 A continuous drain current (TC = 25°C). |
| Qg (total) | 11.4 nC @ VDD = 560 V - Supports efficient 65–100 kHz switching with moderate gate drive strength. |
| dv/dt capability | 4.5 V/ns - Sustains rapid voltage transitions without spurious turn-on in high-noise SMPS environments. |
| EAS | 110 mJ @ Tj = 25°C - Absorbs unclamped inductive energy during startup or overload without failure. |
| VGS(th) | 3.0–4.5 V - Ensures clean turn-on with standard 5 V or 10 V gate drivers; avoids partial enhancement near threshold. |
| Tj max | 150 °C - Allows operation in sealed industrial enclosures with limited airflow and thermal derating. |
Pinout & Package
STD2NK70ZT4 is housed in a surface-mount DPAK (TO-252) package with exposed drain pad for thermal dissipation. The package measures 6.0–6.2 mm × 6.4–6.6 mm × 2.2–2.4 mm (L × W × H), with 3 leads on 2.54 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Gate) | Control input | Receives PWM signal; protected by integrated ±30 V Zener clamps to prevent overvoltage damage. |
| 2 (Drain) | High-side switch node | Connected to primary winding and bulk capacitor; electrically tied to exposed copper pad for heatsinking. |
| 3 (Source) | Power return / reference | Common return path for load current; referenced to controller ground; enables source-follower sensing. |
Key Features
| Feature | Design Value |
|---|---|
| Zener-protected gate | Integrated ±30 V bidirectional clamping eliminates need for external TVS or resistor-divider networks. |
| 100% avalanche tested | Each unit validated for single-pulse EAS ≥ 110 mJ - guarantees ruggedness in unclamped inductive switching. |
| Extremely high dv/dt | Rated 4.5 V/ns - prevents false triggering during fast VDS slew in high-frequency flyback snubbers. |
| SuperMESH™ layout | Optimized strip geometry reduces RDS(on) by ~20% vs prior-generation 700 V MOSFETs at same die size. |
| ESD-improved capability | 2000 V HBM rating - supports automated assembly and handling without special ESD controls beyond Class 1A. |
Applications
| Monitor SMPS | Industrial AC/DC Adapter |
|---|---|
Use Scenario: 20–32 W flyback converter powering LCD monitor logic and backlight inverters from universal AC input. IC Role / Device Role / Timing Role: Primary-side high-voltage switch controlling energy transfer during DCM operation at 65 kHz. Use Value: 700 V rating accommodates 385 V DC bus peaks; 6 Ω RDS(on) limits conduction loss to <1.5 W at full load. |
Use Scenario: Sealed 15 W industrial AC/DC adapter powering PLC I/O modules in factory environments. IC Role / Device Role / Timing Role: Main switching element in isolated flyback with reinforced insulation and wide ambient temperature range. Use Value: 150 °C max junction temperature and 4.5 V/ns dv/dt ensure reliability across -40°C to +85°C operating range. |
| Battery Charger Flyback | Welding Equipment Auxiliary Supply |
Use Scenario: Multi-output flyback supplying 5 V/3.3 V logic rails and isolated gate drive for main inverter in Li-ion charger. IC Role / Device Role / Timing Role: High-side switch regulating output via optocoupler feedback; operates in DCM for cross-regulation. Use Value: Low Qg (11.4 nC) enables clean switching with low-power gate driver ICs like UC3842 derivatives. |
Use Scenario: Auxiliary 24 V supply for control circuitry in arc welding inverters, subject to high EMI and thermal cycling. IC Role / Device Role / Timing Role: Primary switch in ruggedized flyback delivering isolated bias power to gate drivers and sensors. Use Value: Avalanche ruggedness (110 mJ) and 100% test coverage ensure survival during repeated short-circuit events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage flyback switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STP2NK70Z | TO-220 package; identical electrical specs but higher Rthj-amb (62 °C/W vs 300 °C/W for DPAK); no tape-and-reel option. | Suitable for prototyping or low-volume through-hole boards; not recommended for automated SMT production. | Select when manual assembly or heatsink mounting is preferred; avoid for space-constrained PCB layouts. |
| FQP7N70 | 700 V, 7.5 Ω RDS(on), 1.2 A ID; no integrated Zener; lower ESD rating (1500 V HBM); higher Qg (19 nC). | Lacks gate protection - requires external clamping; less robust in noisy industrial environments. | Consider only if cost is primary constraint and board-level protection is already implemented. |
Compared with STP2NK70Z and FQP7N70, STD2NK70ZT4 offers superior manufacturability (DPAK tape-and-reel), guaranteed avalanche ruggedness, and integrated gate protection - making it the optimal choice for volume production of compact, reliable flyback converters.
Availability
STD2NK70ZT4 is available at Aetrix Electronics and suitable for monitor power supplies, industrial AC/DC adapters, and battery charger flyback converters requiring stable component supply and long-term manufacturing continuity.
Supply support for STD2NK70ZT4 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, power, MCU, and sensor solutions for automotive, industrial, and consumer markets.
STD2NK70ZT4 belongs to ST's SuperMESH™ high-voltage MOSFET product line, engineered specifically for efficiency and ruggedness in compact, cost-sensitive flyback and resonant converters targeting industrial and computing power applications.
FAQ
What is the maximum continuous drain current at 100°C case temperature?
The STD2NK70ZT4 supports 1 A continuous drain current at TC = 100°C, as specified in Table 3 (Absolute Maximum Ratings). This derating reflects thermal limitations of the DPAK package; at 25°C case temperature, it delivers 1.6 A continuously with 45 W total dissipation.
Does this MOSFET require external gate protection?
No. STD2NK70ZT4 integrates bidirectional gate-source Zener diodes rated at ±30 V, providing inherent protection against ESD and gate transients. External clamping components are unnecessary unless system-level surge requirements exceed IEC 61000-4-5 Level 4.
Can STD2NK70ZT4 replace STD2NK70Z-1 in existing designs?
Yes - both share identical electrical specifications and thermal performance. The only difference is packaging: STD2NK70ZT4 is DPAK in tape-and-reel (for SMT), while STD2NK70Z-1 is IPAK in tube (through-hole). Footprint and soldering process must be updated accordingly.
What is the typical reverse recovery time of the body diode?
The body diode exhibits trr = 334 ns at Tj = 25°C and 350 ns at Tj = 150°C (Table 9), measured with ISD = 1.6 A, di/dt = 100 A/µs, and VDD = 50 V. This soft recovery characteristic minimizes switching noise in flyback snubberless designs.
STD2NK70ZT4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- SuperMESH™
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- FET Type:
- N-Channel
- Technology:
- MOSFET (Metal Oxide)
- Drain to Source Voltage (Vdss):
- 700 V
- Current - Continuous Drain (Id) @ 25°C:
- 1.6A (Tc)
- Drive Voltage (Max Rds On, Min Rds On):
- 10V
- Rds On (Max) @ Id, Vgs:
- 7Ohm @ 800mA, 10V
- Vgs(th) (Max) @ Id:
- 4.5V @ 50µA
- Gate Charge (Qg) (Max) @ Vgs:
- 11.4 nC @ 10 V
- Vgs (Max):
- ±30V
- Input Capacitance (Ciss) (Max) @ Vds:
- 280 pF @ 25 V
- FET Feature:
- -
- Power Dissipation (Max):
- 45W (Tc)
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
STD2NK70ZT4 FAQ
1.How can I place an order for STD2NK70ZT4 through Aetrix?
Please submit a Request for Quotation (RFQ) for STD2NK70ZT4 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 STD2NK70ZT4 reliable?
The price and inventory of STD2NK70ZT4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STD2NK70ZT4 is usually 5 days.
3.What payment methods are accepted for STD2NK70ZT4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STD2NK70ZT4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STD2NK70ZT4?
STD2NK70ZT4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STD2NK70ZT4 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 STD2NK70ZT4?
For technical support, including STD2NK70ZT4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STD2NK70ZT4 requirements.
6.How does Aetrix verify that STD2NK70ZT4 is sourced from the original manufacturer or authorized distributors?
All STD2NK70ZT4 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 STD2NK70ZT4 meets industry standards.
7.What is the process for return or replacement of STD2NK70ZT4?
All STD2NK70ZT4 units undergo pre-shipment inspection (PSI). If there is an issue with STD2NK70ZT4, 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 STD2NK70ZT4 part is unused and in its original packaging.
Return procedure for STD2NK70ZT4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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