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Taiwan Semiconductor Corporation SMA4F25AH MWG
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- Part No.:
- SMA4F25AH MWG
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA4F25AH MWG.pdf
- Description:
- 400W, 29.4V, 5%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:6,548
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Product details
Overview
SMA4F25AH from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode with a 25V working stand-off voltage, 27.9–30.9V breakdown voltage at 1mA, and 40.6V clamping voltage at 9.9A peak pulse current; used for overvoltage protection in automotive BLDC motor drives and battery management systems.
For engineers reviewing the SMA4F25AH datasheet, SMA4F25AH pinout, SMA4F25AH application, or SMA4F25AH equivalent, key selection criteria include unidirectional polarity, Thin SMA package thermal performance (RθJL = 20°C/W), AEC-Q101 qualification, and 175°C maximum junction temperature for under-hood reliability.
Technical Context
This TVS diode employs a glass-passivated silicon junction optimized for fast response to transient surges (10/1000μs waveform), delivering precise clamping with low leakage (<1μA at 25V) and stable VBR temperature coefficient (0.095%/°C). Its unidirectional configuration provides forward conduction capability (VF = 3.5V @ 25A) while suppressing reverse transients.
Designed for PCB-level surge immunity in high-reliability environments, it operates across –55°C to +175°C and meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1 requirements-critical for automotive power electronics assembly and long-term field operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 25 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT=1mA | 27.9–30.9 V - Verified breakdown threshold ensuring predictable turn-on during transients |
| VC @ IPPM=9.9A | 40.6 V - Clamped voltage limiting downstream circuit stress during 10/1000μs surge |
| PPPM | 400 W - Peak pulse power handling capacity per standard IEC 61000-4-5 surge test profile |
| RθJL | 20 °C/W - Junction-to-lead thermal resistance enabling efficient heat transfer to PCB copper pad |
| Junction Temp Range | –55°C to +175°C - Full operational range supporting under-hood automotive placement |
| Leakage @ VWM | <1 μA - Minimal standby power loss and signal integrity impact in always-on systems |
Pinout & Package
Package: Thin SMA (DO-214AC), surface-mount, unidirectional, cathode indicated by band. Weight: 0.030 g. UL 94V-0 molding compound; matte tin-plated leads compliant with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current input / transient return path | Connects to protected circuit ground or low-side reference; enables forward conduction during overcurrent events |
| Cathode | Protected line connection / clamping node | Connects to line being protected (e.g., motor phase, BMS sense rail); sinks surge current into ground |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| Glass passivated junction | Enhanced moisture resistance and long-term stability of VBR and leakage in humid environments |
| VBR tempco ≤ 0.095%/°C | Predictable clamping voltage shift across –40°C to +125°C ambient, critical for engine bay designs |
| Thin SMA package | Low-profile footprint (4.5 × 2.7 mm) compatible with automated SMT placement and high-density PCB layouts |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive for environmentally regulated supply chains |
Applications
| BLDC Motor Drive Protection | Battery Management System (BMS) |
|---|---|
Use Scenario: Suppresses inductive kickback and load dump transients on 24V BLDC motor phase lines in automotive HVAC or power steering modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed between phase output and chassis ground to clamp voltage spikes exceeding 25V. Use Value: Limits peak voltage to 40.6V during 9.9A surges, protecting gate drivers and MCU I/O without derating margin loss. | Use Scenario: Guards cell monitor IC inputs and communication lines against ESD and board-level surges in 12–48V lithium-ion BMS stacks. IC Role / Device Role / Timing Role: Standoff-rated protector on analog sensing rails and CAN/LIN bus lines, leveraging <1μA leakage at 25V. Use Value: Maintains measurement accuracy and communication integrity while surviving 400W transient events per IEC 61000-4-5. |
| Automotive Lighting Control | Switching Mode Power Supply (SMPS) |
Use Scenario: Shields LED driver ICs and MOSFETs from load dump and jump-start transients in headlamp and DRL modules. IC Role / Device Role / Timing Role: Primary clamping device on 24V input rail, coordinated with upstream fuse and downstream LC filtering. Use Value: Withstands 175°C junction temperature and meets AEC-Q101, enabling direct placement near high-power LEDs. | Use Scenario: Protects secondary-side rectifiers and feedback optocouplers in 24V-output DC/DC converters for infotainment and ADAS ECUs. IC Role / Device Role / Timing Role: Secondary-rail TVS on output capacitor node, absorbing reflected switching noise and cross-conduction spikes. Use Value: 20°C/W RθJL allows effective thermal coupling to 5mm×5mm Cu pad, sustaining 7.5W steady-state dissipation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ25A | Same Thin SMA package; VBR = 27.8–30.8V; VC = 40.1V @ 10A; RθJA = 65°C/W vs. 62°C/W | Identical AEC-Q101 qualification; slightly lower clamping but higher thermal resistance | Preferred where tighter VC tolerance is prioritized over thermal margin |
| Vishay SMA6J25A | Same package; VBR = 27.8–30.8V; VC = 41.4V @ 9.7A; PPPM = 600W; TJ max = 150°C | Higher surge rating but lower max junction temperature limits under-hood use | Selected when higher single-pulse energy absorption is required and ambient stays below 125°C |
Compared with SMAJ25A and SMA6J25A, the SMA4F25AH offers superior thermal robustness (175°C TJ max, RθJL = 20°C/W) and tighter VBR tempco-making it optimal for sustained high-temperature automotive deployments where long-term parameter stability is critical.
Availability
SMA4F25AH is available at Aetrix Electronics and suitable for BLDC motor drives, battery management systems, and automotive lighting applications requiring stable component supply, AEC-Q101 compliance, and high-temperature surge resilience.
Supply support for SMA4F25AH 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated Taiwanese manufacturer specializing in discrete power semiconductors, TVS diodes, and rectifiers for automotive, industrial, and consumer markets.
The SMA4FxxAH series was developed specifically for AEC-Q101-compliant transient suppression in space-constrained, thermally demanding automotive subsystems-including motor control, lighting, and power conversion.
FAQ
What is the maximum clamping voltage of the SMA4F25AH under a 10/1000μs surge?
The SMA4F25AH has a maximum clamping voltage (VC) of 40.6 V when subjected to a 10/1000μs waveform at its rated peak pulse current of 9.9 A. This value is measured per standard test conditions (TA = 25°C) and ensures downstream components remain within safe voltage limits during transient events. The SMA4F25AH maintains this clamping performance across its full operating temperature range due to its low VBR temperature coefficient.
Is the SMA4F25AH suitable for automotive under-hood applications?
Yes, the SMA4F25AH is explicitly qualified to AEC-Q101 and rated for junction temperatures up to +175°C, making it suitable for under-hood automotive applications such as BLDC motor drives and lighting control modules. Its glass-passivated junction, halogen-free construction, and JESD201 Class 2 whisker resistance further support reliability in harsh thermal and mechanical environments typical of engine compartments.
What does the marking code "4F025" indicate on the SMA4F25AH device?
The marking code "4F025" laser-etched on the SMA4F25AH identifies it as the 25V variant within the SMA4FxxAH family. It corresponds directly to the device's 25V working stand-off voltage (VWM) and distinguishes it from other members like SMA4F18AH (4F018) or SMA4F30AH (4F030). This marking is standardized per TSC's ordering documentation and appears on all units shipped in tape-and-reel packaging.
How does the thermal performance of the SMA4F25AH compare to standard SMA packages?
The SMA4F25AH uses a Thin SMA (DO-214AC) package with a junction-to-lead thermal resistance (RθJL) of 20°C/W-lower than many legacy SMA devices-enabling more efficient heat transfer to the PCB copper pad. When mounted on a 5mm × 5mm Cu pad, its RθJA is 62°C/W, supporting 7.5W steady-state dissipation. This enhanced thermal design improves reliability in high-power density automotive layouts.
Can the SMA4F25AH be used in bidirectional protection configurations?
No, the SMA4F25AH is a unidirectional TVS diode and is not designed for bidirectional surge suppression. Its electrical characteristics-including forward voltage (VF = 3.5 V @ 25 A) and specified reverse-biased parameters-are defined only for unidirectional operation. For bidirectional protection, designers must select a dedicated bidirectional part such as the SMA4F25AY or equivalent, as the SMA4F25AH lacks symmetrical clamping behavior in both polarities.
SMA4F25AH MWG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-221AC, SMA Flat Leads
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 25V
- Voltage - Breakdown (Min):
- 27.9V
- Voltage - Clamping (Max) @ Ipp:
- 40.6V
- Current - Peak Pulse (10/1000µs):
- 9.9A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Thin SMA
SMA4F25AH MWG FAQ
1.How can I place an order for SMA4F25AH MWG through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA4F25AH MWG 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 SMA4F25AH MWG reliable?
The price and inventory of SMA4F25AH MWG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA4F25AH MWG is usually 5 days.
3.What payment methods are accepted for SMA4F25AH MWG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA4F25AH MWG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA4F25AH MWG?
SMA4F25AH MWG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA4F25AH MWG 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 SMA4F25AH MWG?
For technical support, including SMA4F25AH MWG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA4F25AH MWG requirements.
6.How does Aetrix verify that SMA4F25AH MWG is sourced from the original manufacturer or authorized distributors?
All SMA4F25AH MWG 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 SMA4F25AH MWG meets industry standards.
7.What is the process for return or replacement of SMA4F25AH MWG?
All SMA4F25AH MWG units undergo pre-shipment inspection (PSI). If there is an issue with SMA4F25AH MWG, 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 SMA4F25AH MWG part is unused and in its original packaging.
Return procedure for SMA4F25AH MWG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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