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Taiwan Semiconductor Corporation SMA4F15AH
- Part No.:
- SMA4F15AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA4F15AH.pdf
- Description:
- 400W, 17.65V, 5%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:5,411
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Product details
Overview
SMA4F15AH from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode with a 15V working stand-off voltage, 16.8–18.5V breakdown range at 1mA, and 24.4V clamping voltage at 16.4A peak pulse current; used for overvoltage protection in automotive BLDC motor drives and battery management systems.
For engineers reviewing the SMA4F15AH datasheet, SMA4F15AH pinout, SMA4F15AH application, or SMA4F15AH equivalent, key selection criteria include its AEC-Q101 qualification, 175°C max junction temperature, Thin SMA package thermal performance (RθJL = 20°C/W), and unidirectional polarity for DC rail protection.
Technical Context
The SMA4F15AH operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve stable breakdown behavior across –55°C to +175°C ambient. Its 0.095%/°C VBR temperature coefficient ensures predictable voltage shift under thermal stress.
Designed for 10/1000µs impulse waveforms, it delivers 400W non-repetitive peak pulse power with 24.4V clamping at 16.4A, while maintaining ≤1µA blocking leakage at 15V and 25°C - critical for low-power standby circuits in automotive ECUs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR @ IT=1mA | 16.8–18.5 V - Verified breakdown threshold ensuring reliable turn-on during transients |
| VC @ IPPM=16.4A | 24.4 V - Clamped voltage limiting downstream IC stress during 10/1000µs surge events |
| PPPM | 400 W - Peak pulse power handling capability per standard IEC 61000-4-5 Level 4 |
| RθJL | 20 °C/W - Junction-to-lead thermal resistance enabling high-power dissipation on minimal PCB copper |
| Junction Temp Range | –55°C to +175°C - Supports under-hood automotive placement without derating |
Pinout & Package
Package: Thin SMA (DO-214AC), surface-mount, unidirectional configuration with cathode band marking. Weight: 0.030 g. Meets UL 94V-0, JESD201 Class 2 whisker resistance, and J-STD-020 MSL Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to protected DC rail (e.g., 12V battery line); conducts during reverse surge |
| Cathode | Output/Load side | Connected to ground or low-impedance return path; marked by band on package body |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
| Glass-passivated junction | Ensures long-term stability of VBR and low leakage under humidity and thermal stress |
| 0.095%/°C VBR tempco | Enables accurate overvoltage margining across full operating temperature range |
| MSL Level 1 | Zero floor life limitation - can be mounted directly after unpacking without baking |
Applications
| Automotive Body Control Module | BLDC Motor Drive Power Stage |
|---|---|
Use Scenario: Protecting LIN bus interface and microcontroller I/O lines from load dump and inductive kickback in door modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 12V rail and ground to clamp transients before they reach MCU power pins. Use Value: 24.4V clamping at 16.4A prevents latch-up or damage to 3.3V/5V logic rails downstream of LDOs. | Use Scenario: Safeguarding gate drivers and half-bridge FETs against switching-induced voltage spikes in 24V e-bike controllers. IC Role / Device Role / Timing Role: Rail-to-ground suppression on high-side supply node, activated within nanoseconds of overvoltage onset. Use Value: 400W peak power rating absorbs energy from 10/1000µs pulses without degradation across >100,000 cycles. |
| Battery Management System (BMS) | LED Driver for Automotive Lighting |
Use Scenario: Guarding cell monitoring ICs and coulomb counters against hot-plug and charge interruption surges in 12V/48V hybrid BMS. IC Role / Device Role / Timing Role: Standoff-rated protection on analog front-end inputs and communication lines (e.g., SMBus). Use Value: ≤1µA leakage at 15V preserves measurement accuracy and minimizes quiescent current drain. | Use Scenario: Suppressing EMI and load dump spikes on constant-current LED strings in headlamp modules. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input capacitor rail feeding buck controller ICs. Use Value: Thin SMA footprint enables placement adjacent to connectors without increasing board area or thermal mass. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ15A | Same 15V VWM, but lower PPPM = 400W (same rating), higher VC = 24.4V (identical), RθJA = 62°C/W (same) | No AEC-Q101 qualification; intended for industrial, not automotive | Select SMA4F15AH when automotive qualification and extended temperature operation are mandatory |
| SMBJ15A | Higher PPPM = 600W, larger SMB package (DO-214AA), VC = 24.4V (identical), RθJA = 40°C/W | Requires more PCB area; better thermal performance but incompatible footprint | Choose SMBJ15A only if system-level surge testing exceeds 400W or layout allows larger package |
Compared with SMAJ15A and SMBJ15A, the SMA4F15AH uniquely combines AEC-Q101 compliance, Thin SMA footprint, and identical 24.4V clamping in a 0.030g package - making it optimal for space-constrained automotive modules where qualification and weight matter.
Availability
SMA4F15AH is available at Aetrix Electronics and suitable for automotive body control modules, BLDC motor drives, battery management systems, and LED lighting applications requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMA4F15AH 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, and MOSFETs for automotive and industrial markets.
The SMA4FxxAH series was developed specifically for AEC-Q101-compliant transient protection in compact automotive subsystems, emphasizing thermal efficiency, low leakage, and consistent clamping performance across wide temperature ranges.
FAQ
What is the maximum clamping voltage of the SMA4F15AH at its rated peak pulse current?
The SMA4F15AH has a maximum clamping voltage (VC) of 24.4 V at 16.4 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value is measured per JEDEC standards and ensures downstream components see no more than 24.4 V during surge events. The SMA4F15AH maintains this clamping performance across its full operating temperature range of –55°C to +175°C.
Is the SMA4F15AH suitable for automotive applications requiring AEC-Q101 qualification?
Yes, the SMA4F15AH is explicitly AEC-Q101 qualified per the manufacturer's documentation and test reports. It undergoes rigorous stress testing including temperature cycling, highly accelerated life testing (HALT), and ESD verification. This qualification makes the SMA4F15AH appropriate for under-hood and cabin-mounted automotive electronics where reliability and long-term stability are mandatory.
What is the thermal resistance from junction to lead (RθJL) for the SMA4F15AH?
The SMA4F15AH has a typical junction-to-lead thermal resistance (RθJL) of 20°C/W when mounted on a 5 mm × 5 mm copper pad test board. This low value enables efficient heat transfer from the die to the PCB, supporting sustained power dissipation up to 7.5 W in steady-state operation and rapid thermal recovery after transient events.
Does the SMA4F15AH have unidirectional or bidirectional polarity?
The SMA4F15AH is a unidirectional TVS diode, indicated by its single cathode band marking and specified electrical parameters (e.g., forward voltage VF = 3.5 V @ 25 A). It protects against positive-going transients on DC lines and must be oriented with cathode toward the protected circuit's ground reference. Bidirectional variants are not offered in the SMA4FxxAH family.
What packaging and reel quantity is available for the SMA4F15AH?
The SMA4F15AH is supplied in Thin SMA (DO-214AC) package format on tape-and-reel, with 14,000 units per reel. This packaging complies with J-STD-020 MSL Level 1, meaning no moisture sensitivity limitations - devices may be placed directly after opening without baking or dry-pack requirements.
SMA4F15AH 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):
- 15V
- Voltage - Breakdown (Min):
- 16.8V
- Voltage - Clamping (Max) @ Ipp:
- 24.4V
- Current - Peak Pulse (10/1000µs):
- 20.5A
- 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
SMA4F15AH FAQ
1.How can I place an order for SMA4F15AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA4F15AH 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 SMA4F15AH reliable?
The price and inventory of SMA4F15AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA4F15AH is usually 5 days.
3.What payment methods are accepted for SMA4F15AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA4F15AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA4F15AH?
SMA4F15AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA4F15AH 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 SMA4F15AH?
For technical support, including SMA4F15AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA4F15AH requirements.
6.How does Aetrix verify that SMA4F15AH is sourced from the original manufacturer or authorized distributors?
All SMA4F15AH 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 SMA4F15AH meets industry standards.
7.What is the process for return or replacement of SMA4F15AH?
All SMA4F15AH units undergo pre-shipment inspection (PSI). If there is an issue with SMA4F15AH, 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 SMA4F15AH part is unused and in its original packaging.
Return procedure for SMA4F15AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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