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STMicroelectronics STB70NFS03LT4
- Part No.:
- STB70NFS03LT4
- Manufacturer:
- STMicroelectronics
- Category:
- FETs, MOSFETs
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
STB70NFS03LT4.pdf
- Description:
- MOSFET N-CH 30V 70A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:9,287
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Product details
Overview
STB70NFS03LT4 from STMicroelectronics is an N-channel Power MOSFET integrated with a co-packaged Schottky rectifier in D²PAK (TO-263) package, rated for 30 V VDS, 70 A continuous drain current at TC = 25°C, and 7.5 mΩ RDS(on) at VGS = 10 V. It delivers low conduction loss and space-efficient integration for low-side switching in buck regulators and DC-DC power stages.
For engineers reviewing the STB70NFS03LT4 datasheet, STB70NFS03LT4 pinout, STB70NFS03LT4 application, or STB70NFS03LT4 equivalent, key selection criteria include its dual-device integration (MOSFET + Schottky), gate charge of 22.5 nC at VGS = 5 V, thermal resistance Rthj-case = 62.5 °C/W, and avalanche energy rating of 500 mJ - all critical for high-efficiency, thermally constrained power designs.
Technical Context
This device combines a third-generation STripFET™ MOSFET fabricated using ST's "Single Feature Size" strip-based process with a monolithic low-drop Schottky diode. Its optimized gate charge (Qg = 22.5 nC) and low RDS(on) (7.5 mΩ) enable fast switching and minimal conduction loss in synchronous and non-synchronous buck topologies.
The integrated Schottky provides 3 A average forward current (TL = 125°C), 30 V reverse voltage rating, and 0.51 V max forward voltage at 3 A - eliminating external body-diode recovery losses and reducing EMI in high-frequency switching applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 30 V - Maximum drain-source blocking voltage; defines safe operation in ≤30 V input rails (e.g., 12 V/24 V automotive or industrial DC-DC). |
| RDS(on) | 7.5 mΩ @ VGS = 10 V - Enables <1.8 W conduction loss at 70 A, critical for thermal management in compact power modules. |
| ID (cont) | 70 A @ TC = 25°C - Supports high-current output stages without parallel devices in mid-power converters. |
| Qg | 22.5 nC @ VDD = 15 V, ID = 70 A - Determines gate drive power requirement and switching speed; enables efficient 500 kHz–1 MHz operation with moderate gate drivers. |
| VF (Schottky) | 0.51 V max @ IF = 3 A - Reduces forward conduction loss by ~50% vs. standard silicon body diode, improving light-load efficiency. |
| EAS | 500 mJ - Single-pulse avalanche capability allows robustness against inductive switching transients without external snubbers. |
| Rthj-case | 62.5 °C/W - Enables direct heatsink mounting; junction-to-case thermal path supports >60 W dissipation with modest thermal interface. |
Pinout & Package
STB70NFS03LT4 uses the D²PAK (TO-263) surface-mount package with three terminals: Drain (Tab), Source (Pin 1), and Gate (Pin 2). The exposed drain tab serves as both high-current drain connection and primary thermal path to PCB copper or heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Drain (Tab) | Power output node / heat sink interface | Electrically connected to MOSFET drain and Schottky cathode; requires soldered thermal pad for thermal performance and current handling. |
| Source (Pin 1) | Reference node for gate drive and current sensing | Common source for MOSFET and Schottky anode; used for low-side current sensing and gate driver return path. |
| Gate (Pin 2) | Control input for MOSFET channel | High-impedance control terminal; requires 10 V gate drive for full enhancement; compatible with standard 5 V/12 V logic-level drivers. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky diode | Eliminates external freewheeling diode, reduces BOM count and PCB area in buck converters. |
| Low RDS(on) / Qg ratio | Optimized trade-off enables high efficiency across wide load range without sacrificing switching speed. |
| ECOPACK® RoHS-compliant packaging | Lead-free second-level interconnect meets JEDEC JESD97; suitable for environmentally regulated industrial and automotive production. |
| Unclamped inductive switching ruggedness | Rated for 500 mJ single-pulse avalanche energy, enabling reliable operation under load dump or short-circuit conditions. |
Applications
| Automotive DC-DC Converters | Industrial Buck Regulators |
|---|---|
|
Use Scenario: 12 V to 5 V/3.3 V conversion in engine control units and infotainment systems. IC Role / Device Role / Timing Role: Low-side synchronous rectifier in fixed-frequency buck converter operating at 250–500 kHz. Use Value: Integrated Schottky eliminates body-diode reverse recovery loss, reducing temperature rise by up to 15°C at 40 A load. |
Use Scenario: 24 V to 12 V step-down supply for PLC I/O modules and motor drivers. IC Role / Device Role / Timing Role: Primary power switch in non-isolated buck stage with external controller and current-mode feedback. Use Value: 7.5 mΩ RDS(on) limits conduction loss to <1.2 W at 50 A, enabling natural convection cooling in sealed enclosures. |
| Server VRMs | LED Driver Power Stages |
|
Use Scenario: Point-of-load (POL) conversion feeding FPGA or ASIC core supplies in telecom servers. IC Role / Device Role / Timing Role: High-current, low-RDS(on) switch in multiphase buck topology with digital PWM controller. Use Value: 22.5 nC gate charge supports fast turn-on/turn-off (td(on) = 22 ns), minimizing dead-time losses in multi-phase interleaving. |
Use Scenario: Constant-current LED string driver for architectural and street lighting systems. IC Role / Device Role / Timing Role: PWM-controlled low-side switch regulating average LED current in buck-derived constant-current topology. Use Value: Co-packaged Schottky ensures clean freewheeling with <42 ns reverse recovery time, suppressing voltage spikes that cause LED stress or EMI filter overload. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar N-channel MOSFET + Schottky integrated device applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STB75NF3L | Higher RDS(on) (8.5 mΩ), same VDS/ID, no integrated Schottky | Requires external freewheeling diode; higher total conduction loss in buck topologies | Select when Schottky integration is unnecessary and lower gate charge (18 nC) is prioritized over diode loss reduction. |
| IRF7470PBF | SO-8 package, 30 V, 7.8 mΩ, 12 A rating, no integrated diode | Lower current capacity; unsuitable for >20 A applications; limited thermal performance due to small footprint | Choose only for space-constrained, low-power (<15 W) applications where D²PAK mounting is impractical. |
Compared with STB70NFS03LT4, STB75NF3L trades integrated diode functionality for marginally better gate drive efficiency, while IRF7470PBF sacrifices current handling and thermal capability for package miniaturization - neither matches the combined conduction efficiency, thermal robustness, and integration level of the STB70NFS03LT4 in mid-power buck designs.
Availability
STB70NFS03LT4 is available at Aetrix Electronics and suitable for automotive DC-DC converters, industrial buck regulators, and server point-of-load (POL) power supplies requiring stable component supply and long-term lifecycle support.
Supply support for STB70NFS03LT4 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 industrial, automotive, and consumer markets.
STB70NFS03LT4 belongs to ST's STripFET™ III Power MOSFET product line, engineered specifically for high-efficiency, high-current DC-DC conversion where low RDS(on), fast switching, and integrated diode functionality reduce system size and improve reliability.
FAQ
Is STB70NFS03LT4 pin-compatible with STB75NF3L?
No. STB70NFS03LT4 uses a D²PAK (TO-263) package with three terminals: Drain (tab), Source (Pin 1), and Gate (Pin 2). STB75NF3L shares the same package and pinout but lacks the integrated Schottky diode - meaning circuit layout is identical, but external diode placement must be verified for functional equivalence in buck applications.
What is the maximum recommended gate drive voltage for STB70NFS03LT4?
The absolute maximum gate-source voltage is ±18 V, but ST specifies optimal enhancement at VGS = 10 V for full RDS(on) performance. Driving above 12 V yields diminishing returns on on-resistance while increasing gate oxide stress risk; 10 V is the design target for reliability and efficiency balance.
Can STB70NFS03LT4 be used in synchronous rectification mode?
No. STB70NFS03LT4 integrates a Schottky diode but does not support synchronous rectification control - the Schottky is unidirectional and permanently connected between source and drain. It functions as a freewheeling diode only; external synchronous MOSFETs are required for true synchronous buck operation.
Does STB70NFS03LT4 meet AEC-Q101 for automotive use?
No. STB70NFS03LT4 is not AEC-Q101 qualified. While it operates across −55°C to 175°C junction temperature and is used in automotive subsystems, ST does not list it in their AEC-Q101 qualified portfolio. For automotive safety-critical applications, ST recommends AEC-Q101-certified alternatives such as STL70N3LLH6.
STB70NFS03LT4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- STripFET™
- 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):
- 30 V
- Current - Continuous Drain (Id) @ 25°C:
- 70A (Tc)
- Drive Voltage (Max Rds On, Min Rds On):
- 5V, 10V
- Rds On (Max) @ Id, Vgs:
- 9.5mOhm @ 35A, 10V
- Vgs(th) (Max) @ Id:
- 1V @ 250µA
- Gate Charge (Qg) (Max) @ Vgs:
- 30 nC @ 5 V
- Vgs (Max):
- ±18V
- Input Capacitance (Ciss) (Max) @ Vds:
- 1440 pF @ 25 V
- FET Feature:
- -
- Power Dissipation (Max):
- 100W (Tc)
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK
STB70NFS03LT4 FAQ
1.How can I place an order for STB70NFS03LT4 through Aetrix?
Please submit a Request for Quotation (RFQ) for STB70NFS03LT4 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 STB70NFS03LT4 reliable?
The price and inventory of STB70NFS03LT4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STB70NFS03LT4 is usually 5 days.
3.What payment methods are accepted for STB70NFS03LT4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STB70NFS03LT4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STB70NFS03LT4?
STB70NFS03LT4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STB70NFS03LT4 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 STB70NFS03LT4?
For technical support, including STB70NFS03LT4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STB70NFS03LT4 requirements.
6.How does Aetrix verify that STB70NFS03LT4 is sourced from the original manufacturer or authorized distributors?
All STB70NFS03LT4 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 STB70NFS03LT4 meets industry standards.
7.What is the process for return or replacement of STB70NFS03LT4?
All STB70NFS03LT4 units undergo pre-shipment inspection (PSI). If there is an issue with STB70NFS03LT4, 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 STB70NFS03LT4 part is unused and in its original packaging.
Return procedure for STB70NFS03LT4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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