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Taiwan Semiconductor Corporation SMA4F22AH MWG
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- Part No.:
- SMA4F22AH MWG
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA4F22AH MWG.pdf
- Description:
- 400W, 25.9V, 5%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:8,954
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Product details
Overview
SMA4F22AH from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode with a 22V working stand-off voltage, 24.6–27.2V breakdown range at 1mA, and 35.7V clamping voltage at 11.2A peak pulse current; used for overvoltage protection in automotive BLDC motor drives and battery management systems.
For engineers reviewing the SMA4F22AH datasheet, SMA4F22AH pinout, SMA4F22AH application, or SMA4F22AH equivalent, key selection criteria include unidirectional polarity, Thin SMA package thermal performance (RθJL = 20°C/W), AEC-Q101 qualification, and 175°C max junction temperature for under-hood reliability.
Technical Context
This TVS diode employs a glass-passivated silicon junction optimized for fast response to transients up to 10/1000μs waveform, with low leakage (<1μA at 22V) and stable VBR temperature coefficient (0.095%/°C). Its single-die configuration in Thin SMA enables compact PCB layout while maintaining 400W non-repetitive peak pulse power handling.
Thermal design relies on low RθJL (20°C/W) and RθJC (16°C/W) values measured on a 5mm × 5mm copper pad test board, supporting sustained operation up to 7.5W steady-state dissipation at TL = 25°C - critical for high-temperature automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR @ IT=1mA | 24.6–27.2 V - Verified breakdown threshold ensuring reliable triggering above system nominal voltage |
| VC @ IPPM=11.2A | 35.7 V - Clamped voltage during 10/1000μs surge, limiting downstream IC stress |
| PPPM | 400 W - Peak pulse power rating defining transient energy absorption capability |
| TJ max | +175 °C - Enables placement near heat sources in engine control units and motor inverters |
| RθJL | 20 °C/W - Low junction-to-lead thermal resistance supports efficient heat transfer to PCB copper |
| Polarity | Unidirectional - Blocks reverse voltage only; suited for DC bus protection with defined ground reference |
Pinout & Package
Package: Thin SMA - Surface-mount plastic package with matte tin-plated leads, UL 94V-0 rated molding compound, and JESD201 Class 2 whisker resistance; dimensions per official outline drawing (cathode band marked).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive terminal for forward bias; connected to protected line in unidirectional configuration | Accepts surge current during clamping; must be routed with low-inductance path to minimize overshoot |
| Cathode | Negative terminal; marked by band on package body | Connected to system ground or low-impedance return path; defines conduction direction and clamping reference |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress requirements |
| Glass passivated junction | Enhances long-term stability and moisture resistance versus epoxy-passivated alternatives |
| VBR tempco ≤0.095%/°C | Minimizes drift across -55°C to +175°C operating range, preserving protection margin in extreme ambient |
| Moisture sensitivity level 1 | Eliminates need for baking prior to reflow, reducing manufacturing complexity and cost |
| Halogen-free (IEC 61249-2-21) | Complies with environmental regulations without compromising flame retardancy (UL 94V-0) |
Applications
| Automotive Engine Control Unit (ECU) | BLDC Motor Drive Inverter |
|---|---|
Use Scenario: Protecting microcontroller I/O and CAN transceiver power rails from load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between 12V supply rail and chassis ground. Use Value: Limits transient voltage to ≤35.7V during 400W surges, preventing latch-up or damage to 3.3V/5V logic interfaces. | Use Scenario: Safeguarding gate drivers and current-sense amplifiers against shoot-through-induced voltage spikes. IC Role / Device Role / Timing Role: Parallel-connected TVS on half-bridge DC bus to clamp ringing and commutation transients. Use Value: Maintains VWM = 22V margin above nominal 18–20V motor supply, enabling robust operation during PWM transitions. |
| Battery Management System (BMS) | LED Driver Power Supply |
Use Scenario: Overvoltage protection on cell monitoring inputs and communication lines in 48V EV auxiliary battery packs. IC Role / Device Role / Timing Role: Input-side TVS on analog front-end channels exposed to hot-plug and cable discharge events. Use Value: Delivers <1μA leakage at 22V, preserving measurement accuracy while surviving 10/1000μs surges per ISO 7637-2 Pulse 5a. | Use Scenario: Suppressing turn-off transients in constant-current LED drivers for automotive lighting modules. IC Role / Device Role / Timing Role: Clamp across MOSFET drain-source to absorb inductive kickback from boost inductors. Use Value: Withstands repetitive 400W pulses without degradation, extending driver lifetime in headlamp and DRL applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A | Lower PPPM (400W same), but higher VC (35.5V vs. 35.7V); identical VWM/VBR range and Thin SMA package | Same automotive and industrial use cases; minor clamping variation does not affect functional compatibility | Select SMAJ22A if legacy design uses SMAJ series footprint and sourcing favors Vishay distribution |
| 1.5SMC22A | Higher package profile (DO-214AB vs. Thin SMA), 400W PPPM, VC = 35.5V, VBR = 24.4–26.9V - slightly tighter tolerance | Less suitable for ultra-thin modules; requires PCB rework due to larger footprint and height | Prefer SMA4F22AH where board thickness or airflow constraints mandate Thin SMA's lower profile and thermal advantage |
Compared with SMAJ22A and 1.5SMC22A, SMA4F22AH offers identical electrical protection specs with AEC-Q101 qualification and superior thermal resistance (RθJL = 20°C/W), making it optimal for space-constrained, high-reliability automotive applications.
Availability
SMA4F22AH is available at Aetrix Electronics and suitable for automotive engine control units, BLDC motor drives, and battery management systems requiring stable component supply with full traceability and lifecycle support.
Supply support for SMA4F22AH 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 power devices and protection components.
The SMA4FxxAH series is designed specifically for AEC-Q101-compliant automotive transient suppression, targeting high-temperature, high-reliability DC power rail protection in ECUs, motor controllers, and charging systems.
FAQ
What is the maximum clamping voltage of SMA4F22AH at its rated peak pulse current?
The SMA4F22AH has a maximum clamping voltage (VC) of 35.7 V when subjected to its specified peak pulse current (IPPM) of 11.2 A under a 10/1000 μs waveform. This value is guaranteed per the manufacturer's electrical specifications table and ensures downstream circuitry remains within safe operating limits during transient events. The SMA4F22AH maintains this clamping performance across its qualified temperature range.
Is SMA4F22AH suitable for bidirectional signal line protection?
No, SMA4F22AH is a unidirectional TVS diode and is not suitable for bidirectional signal line protection. Its electrical characteristics - including polarity marking (cathode band), forward voltage specification (VF = 3.5 V @ 25 A), and unidirectional leakage behavior - confirm it is designed exclusively for DC power rail protection. For bidirectional applications such as USB or RS-485 data lines, a dedicated bidirectional TVS like SMA4F22AY must be selected instead of SMA4F22AH.
Does SMA4F22AH require pre-baking before reflow soldering?
No, SMA4F22AH does not require pre-baking before reflow soldering. It is rated at Moisture Sensitivity Level (MSL) 1 per J-STD-020, meaning it can be stored indefinitely at standard room conditions (≤30°C / 60% RH) without moisture-related assembly risks. This eliminates bake steps in manufacturing, reducing process time and cost while maintaining solder joint integrity for SMA4F22AH in high-volume automotive production.
What is the junction-to-lead thermal resistance (RθJL) of SMA4F22AH, and why does it matter?
The junction-to-lead thermal resistance (RθJL) of SMA4F22AH is 20°C/W, measured on a 5 mm × 5 mm copper pad test board. This low value indicates efficient heat transfer from the silicon die to the PCB copper through the leads, directly supporting higher steady-state power dissipation (7.5 W) and improved reliability in thermally demanding environments such as under-hood automotive applications where the SMA4F22AH operates.
How does SMA4F22AH differ from SMA4F22AY?
SMA4F22AH is unidirectional, while SMA4F22AY is the bidirectional variant of the same family. They share identical VWM (22 V), VBR (24.6–27.2 V), and PPPM (400 W) ratings, but differ in polarity: SMA4F22AH conducts only in reverse breakdown (anode-to-cathode), whereas SMA4F22AY clamps in both directions. The marking code also differs (4F022 vs. 4Y022), and SMA4F22AH is AEC-Q101 qualified for automotive use, unlike the standard-grade SMA4F22AY.
SMA4F22AH 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):
- 22V
- Voltage - Breakdown (Min):
- 24.6V
- Voltage - Clamping (Max) @ Ipp:
- 35.7V
- Current - Peak Pulse (10/1000µs):
- 11.2A
- 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
SMA4F22AH MWG FAQ
1.How can I place an order for SMA4F22AH MWG through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA4F22AH 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 SMA4F22AH MWG reliable?
The price and inventory of SMA4F22AH MWG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA4F22AH MWG is usually 5 days.
3.What payment methods are accepted for SMA4F22AH MWG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA4F22AH MWG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA4F22AH MWG?
SMA4F22AH MWG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA4F22AH 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 SMA4F22AH MWG?
For technical support, including SMA4F22AH MWG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA4F22AH MWG requirements.
6.How does Aetrix verify that SMA4F22AH MWG is sourced from the original manufacturer or authorized distributors?
All SMA4F22AH 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 SMA4F22AH MWG meets industry standards.
7.What is the process for return or replacement of SMA4F22AH MWG?
All SMA4F22AH MWG units undergo pre-shipment inspection (PSI). If there is an issue with SMA4F22AH 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 SMA4F22AH MWG part is unused and in its original packaging.
Return procedure for SMA4F22AH MWG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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