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Taiwan Semiconductor Corporation SMA4F20AH MWG
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- Part No.:
- SMA4F20AH MWG
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA4F20AH MWG.pdf
- Description:
- 400W, 23.55V, 5%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:3,599
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Product details
Overview
SMA4F20AH from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode with a 20V working stand-off voltage, 22.4–24.7V breakdown range at 1mA, and 32.5V clamping voltage at 12.3A peak pulse current; used for overvoltage protection in automotive BLDC motor drives and battery management systems.
For engineers reviewing the SMA4F20AH datasheet, SMA4F20AH pinout, SMA4F20AH application, or SMA4F20AH equivalent, key selection criteria include its AEC-Q101 qualification, 175°C max junction temperature, 20°C/W junction-to-lead thermal resistance, and Thin SMA package compatibility with high-reliability automotive PCB layouts.
Technical Context
This TVS diode employs a glass-passivated silicon junction optimized for fast response to transients up to 10/1000μs waveform, delivering 400W non-repetitive peak pulse power dissipation while maintaining low leakage (<1μA at 20V) and stable VBR temperature coefficient (0.095%/°C).
Its unidirectional configuration enables integration into DC power rails where reverse polarity protection is not required, and its Thin SMA package supports automated SMT assembly with J-STD-002 solderability and JESD201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR min/max | 22.4 V / 24.7 V - Breakdown voltage range at 1 mA test current; defines turn-on threshold tolerance |
| VC @ IPPM | 32.5 V - Clamped voltage at 12.3 A peak pulse current; determines protected circuit's maximum transient stress |
| PPPM | 400 W - Peak pulse power handling capability under 10/1000μs waveform; critical for surge immunity |
| TJ max | +175 °C - Maximum junction temperature; enables operation in under-hood automotive environments |
| RθJL | 20 °C/W - Junction-to-lead thermal resistance; informs thermal design when mounted on 5mm×5mm Cu pad |
| IR @ VWM | <1 μA - Reverse leakage at rated stand-off voltage; ensures minimal standby power loss |
Pinout & Package
Package: Thin SMA - Surface-mount plastic package with cathode band marking, UL 94V-0 rated molding compound, matte tin-plated leads, and 0.030g mass.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current input / Transient return path | Connected to ground or low-side reference in unidirectional clamp configuration |
| Cathode | Protected line connection | Connected to the rail being protected (e.g., 20V DC bus); marked by band on package body |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal stress and humidity exposure |
| Moisture sensitivity level 1 | Zero floor life limitation - no baking required prior to reflow soldering per J-STD-020 |
| Uni-directional configuration | Optimized for DC power rail protection without reverse blocking requirement; lower capacitance than bi-directional variants |
| Halogen-free & RoHS compliant | Fulfills environmental compliance for automotive and industrial end equipment per IEC 61249-2-21 and EU directives |
Applications
| Automotive Power Distribution | BLDC Motor Drive Protection |
|---|---|
Use Scenario: 12V/24V vehicle electrical system protecting ECU power inputs from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed across main power rail to clamp surges to ≤32.5V. Use Value: Prevents damage to downstream PMICs and microcontrollers during ISO 7637-2 Pulse 5a events. | Use Scenario: Protection of gate drivers and MCU I/O in 3-phase BLDC inverters subjected to inductive switching spikes. IC Role / Device Role / Timing Role: Clamp device on low-side shunt resistor supply or auxiliary 12V logic rail. Use Value: Limits transient overshoot to safe levels (<33V), preserving signal integrity and preventing latch-up. |
| Battery Management System (BMS) | LED Driver Power Input |
Use Scenario: Overvoltage suppression on cell monitor IC supply lines in 48V mild-hybrid BMS modules. IC Role / Device Role / Timing Role: Standoff-rated TVS (20V) placed between battery pack tap and monitoring ASIC. Use Value: Ensures reliable operation during hot-swap events and contact bounce-induced spikes. | Use Scenario: Surge protection on constant-current LED driver input in automotive headlamp modules. IC Role / Device Role / Timing Role: Primary transient suppressor on 20V auxiliary rail feeding LED controller IC. Use Value: Maintains luminance stability by preventing reset or brownout of driver IC during EMC testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A | Same 20V VWM, but 400W PPPM rating achieved at higher IPPM (12.9A vs. 12.3A); RθJA = 65°C/W vs. 62°C/W | Designed for general industrial use; lacks AEC-Q101 qualification and JESD201 whisker testing | Preferred for cost-sensitive non-automotive designs where automotive qualification is not mandated |
| SMBJ20A | Higher 600W PPPM rating, larger SMB package (5.3mm × 4.6mm vs. Thin SMA 4.5mm × 2.7mm), VBR range 22.2–24.5V | Used where higher surge margin is needed and board space allows larger footprint | Select when system-level surge testing exceeds IEC 61000-4-5 Level 4 and layout permits SMB size |
Compared with SMAJ20A and SMBJ20A, the SMA4F20AH provides tighter thermal performance (RθJL = 20°C/W), automotive-specific reliability validation, and compact Thin SMA footprint-making it optimal for space-constrained, AEC-Q101–compliant automotive modules.
Availability
SMA4F20AH is available at Aetrix Electronics and suitable for automotive power distribution, BLDC motor control, and battery management systems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMA4F20AH 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, TVS diodes, rectifiers, and MOSFETs.
The SMA4FxxAH series was developed specifically for AEC-Q101–compliant automotive transient suppression, targeting high-temperature under-hood applications with stringent reliability and thermal performance requirements.
FAQ
What is the clamping voltage of the SMA4F20AH under standard test conditions?
The SMA4F20AH has a maximum clamping voltage (VC) of 32.5 V at 12.3 A peak pulse current with a 10/1000 μs waveform. This value is measured per JEDEC standards and ensures protected circuits remain below critical voltage thresholds during surge events. The SMA4F20AH maintains this clamping performance across its specified junction temperature range of –55°C to +175°C.
Is the SMA4F20AH suitable for automotive applications?
Yes, the SMA4F20AH is AEC-Q101 qualified and designed for automotive use, including under-hood environments. It meets JESD201 Class 2 whisker resistance, J-STD-020 moisture sensitivity level 1, and operates up to +175°C junction temperature. The SMA4F20AH is deployed in automotive BLDC motor drives, battery management systems, and power distribution modules.
What is the marking code for the SMA4F20AH?
The SMA4F20AH is marked "4F020" on the device body, followed by date and factory codes. This marking appears adjacent to the cathode band on the Thin SMA package and aligns with Taiwan Semiconductor's standardized coding for the SMA4FxxAH family. The SMA4F20AH marking is laser-etched for durability and readability post-reflow.
How does the thermal performance of the SMA4F20AH compare to standard SMA packages?
The SMA4F20AH uses a Thin SMA package with improved thermal metrics: RθJL = 20°C/W and RθJA = 62°C/W (on 5mm × 5mm Cu pad). This represents a 10–15% improvement over legacy SMA packages due to enhanced leadframe design and die attach. The SMA4F20AH sustains full 400W pulse power only when thermal paths are maintained per datasheet layout guidelines.
Does the SMA4F20AH have bidirectional capability?
No, the SMA4F20AH is a unidirectional TVS diode, intended for DC power rail protection where reverse voltage is not expected. Its electrical behavior mirrors a Zener diode in reverse bias and conducts forward at ~3.5 V. For AC or bipolar transient suppression, a bidirectional variant such as SMA4F20AY would be required-not the SMA4F20AH.
SMA4F20AH 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):
- 20V
- Voltage - Breakdown (Min):
- 22.4V
- Voltage - Clamping (Max) @ Ipp:
- 32.5V
- Current - Peak Pulse (10/1000µs):
- 12.3A
- 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
SMA4F20AH MWG FAQ
1.How can I place an order for SMA4F20AH MWG through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA4F20AH 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 SMA4F20AH MWG reliable?
The price and inventory of SMA4F20AH MWG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA4F20AH MWG is usually 5 days.
3.What payment methods are accepted for SMA4F20AH MWG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA4F20AH MWG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA4F20AH MWG?
SMA4F20AH MWG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA4F20AH 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 SMA4F20AH MWG?
For technical support, including SMA4F20AH MWG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA4F20AH MWG requirements.
6.How does Aetrix verify that SMA4F20AH MWG is sourced from the original manufacturer or authorized distributors?
All SMA4F20AH 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 SMA4F20AH MWG meets industry standards.
7.What is the process for return or replacement of SMA4F20AH MWG?
All SMA4F20AH MWG units undergo pre-shipment inspection (PSI). If there is an issue with SMA4F20AH 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 SMA4F20AH MWG part is unused and in its original packaging.
Return procedure for SMA4F20AH MWG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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