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Taiwan Semiconductor Corporation SMA4F56AH
- Part No.:
- SMA4F56AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA4F56AH.pdf
- Description:
- 400W, 65.9V, 5%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:3,885
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Product details
Overview
SMA4F56AH from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode with a 56V working stand-off voltage, 62.6–69.2V breakdown voltage at 1mA, and 90.9V clamping voltage at 4.4A peak pulse current; used for overvoltage protection in automotive BLDC motor drives and battery management systems.
For engineers reviewing the SMA4F56AH datasheet, SMA4F56AH pinout, SMA4F56AH application, or SMA4F56AH equivalent, key selection criteria include unidirectional polarity, Thin SMA package thermal performance (RθJL = 20°C/W), 175°C max junction temperature, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This TVS diode employs a glass-passivated silicon junction optimized for fast response to transient surges up to 10/1000μs waveform, delivering 400W non-repetitive peak pulse power dissipation while maintaining low leakage (<1μA at 56V) and stable VBR temperature coefficient (0.095%/°C).
Designed for PCB-level surge suppression, it operates across –55°C to +175°C junction range, features matte tin-plated leads compliant with J-STD-002 solderability, and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability standards in its Thin SMA case.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 56 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR @ IT=1mA | 62.6–69.2 V - Verified breakdown threshold ensuring precise overvoltage triggering |
| VC @ IPPM=4.4A | 90.9 V - Clamped voltage during 10/1000μs surge, limiting downstream stress |
| PPPM | 400 W - Peak pulse power handling capability under standardized transient waveform |
| 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 environments |
Pinout & Package
Package: Thin SMA - Surface-mount, unidirectional diode in compact molded case with cathode band marking; dimensions per TSC outline drawing; weight ≈0.030g; RoHS and halogen-free compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal under forward bias | Connected to lower-potential side of protected circuit; enables unidirectional clamping |
| Cathode | Current exit terminal / surge return path | Marked by band; tied to higher-potential rail or ground reference for transient shunting |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics use including engine control and body modules |
| Glass passivated junction | Enhances long-term reliability and moisture resistance in harsh environments |
| VBR tempco ≤ 0.095%/°C | Minimizes voltage drift across temperature, improving clamping consistency |
| Thin SMA package | Enables high-density PCB layouts while meeting UL 94V-0 flammability rating |
Applications
| BLDC Motor Drive Protection | Battery Management System (BMS) |
|---|---|
Use Scenario: Suppresses inductive kickback and load dump transients in 48V BLDC motor gate drivers and power stages. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed across motor phase terminals or supply rails to clamp voltage spikes. Use Value: Limits transient voltage to ≤90.9V, protecting MOSFETs and gate drivers rated for 100V breakdown. | Use Scenario: Guards cell monitoring ICs and communication interfaces against ESD and load dump in EV/PHEV battery packs. IC Role / Device Role / Timing Role: Standoff-rated protector on 56V auxiliary supply lines feeding BMS analog front-ends and CAN transceivers. Use Value: Maintains <1μA leakage at 56V, preventing false fault detection while surviving 400W surges. |
| Automotive Lighting Module | Switching Mode Power Supply (SMPS) |
Use Scenario: Shields LED driver ICs and current-sense amplifiers from alternator-induced transients in headlamp control units. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 56V input rail upstream of DC-DC converters. Use Value: Fast 10/1000μs response ensures clamping before sensitive analog components experience overstress. | Use Scenario: Protects primary-side controllers and secondary-side rectifiers in industrial 56V-output SMPS designs. IC Role / Device Role / Timing Role: Input-stage TVS on bulk capacitor rail to absorb line surges and switching noise. Use Value: RθJL = 20°C/W supports sustained operation at 7.5W steady-state dissipation on 5mm×5mm Cu pad. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ56A | Same Thin SMA package; 400W PPPM; VBR = 62.2–68.8V; VC = 93.6V @ 4.3A | Higher clamping voltage (+2.7V) reduces margin for 100V-rated downstream devices | Acceptable where layout allows minor derating of protected component voltage ratings |
| SMBJ56A | SMB package (larger footprint); same electrical specs; RθJA = 50°C/W vs. SMA4F56AH's 62°C/W | Lower thermal resistance improves power handling but requires more board area | Preferred when thermal budget is constrained and PCB space permits larger package |
Compared with SMAJ56A and SMBJ56A, SMA4F56AH offers tighter VBR tolerance (62.6–69.2V vs. 62.2–68.8V), lower clamping voltage (90.9V), and AEC-Q101 qualification-making it optimal for space-constrained automotive modules requiring certified reliability.
Availability
SMA4F56AH is available at Aetrix Electronics and suitable for automotive BLDC motor drives, battery management systems, and industrial switching mode power supplies requiring stable component supply and AEC-Q101 compliance.
Supply support for SMA4F56AH 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers with global distribution and automotive qualification capabilities.
The SMA4FxxAH series is designed specifically for high-reliability transient suppression in automotive and industrial power systems, emphasizing AEC-Q101 compliance, thermal robustness, and precise voltage clamping in compact Thin SMA packages.
FAQ
What is the maximum clamping voltage of SMA4F56AH under standard test conditions?
The SMA4F56AH has a maximum clamping voltage (VC) of 90.9 V when subjected to a 10/1000 μs peak pulse current of 4.4 A, as specified in the official Taiwan Semiconductor datasheet. This value defines the upper voltage limit imposed on protected circuitry during surge events and is critical for ensuring compatibility with downstream 100V-rated components. The SMA4F56AH maintains this clamping performance across its full operating temperature range.
Is SMA4F56AH qualified for automotive applications?
Yes, SMA4F56AH is AEC-Q101 qualified, confirming its suitability for automotive electronic systems including engine control units, body electronics, and ADAS modules. This qualification covers stress testing for temperature cycling, humidity, mechanical shock, and accelerated life under bias. The SMA4F56AH also meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements-key prerequisites for under-hood deployment.
What is the thermal resistance from junction to lead (RθJL) for SMA4F56AH?
The junction-to-lead thermal resistance (RθJL) of SMA4F56AH is 20°C/W, measured with the device mounted on a 5 mm × 5 mm copper pad PCB per JEDEC standards. This low value enables efficient heat conduction from the silicon die to the PCB copper, supporting reliable operation at its 7.5 W steady-state power dissipation limit. Thermal design must account for this parameter when sizing copper pour areas for thermal relief.
Does SMA4F56AH have unidirectional or bidirectional polarity?
SMA4F56AH is a unidirectional TVS diode, indicated by its single cathode band marking and specified forward voltage (VF = 3.5 V at 25 A). It conducts only during reverse overvoltage events and blocks normal forward-biased operation, making it appropriate for DC power rail protection where polarity is fixed. Bidirectional variants (e.g., SMA4F56AY) are separate part numbers with different marking and electrical behavior.
What packaging format is available for SMA4F56AH?
SMA4F56AH is supplied in Tape & Reel format with 14,000 units per reel, compatible with automated SMT placement equipment. The Thin SMA package conforms to industry-standard dimensions and solder pad layout recommendations published by Taiwan Semiconductor. Each reel includes date code (YW), factory code (F), and part-specific marking (4F056) for full traceability and process control in high-volume manufacturing.
SMA4F56AH 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):
- 56V
- Voltage - Breakdown (Min):
- 62.6V
- Voltage - Clamping (Max) @ Ipp:
- 90.9V
- Current - Peak Pulse (10/1000µs):
- 4.4A
- 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
SMA4F56AH FAQ
1.How can I place an order for SMA4F56AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA4F56AH 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 SMA4F56AH reliable?
The price and inventory of SMA4F56AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA4F56AH is usually 5 days.
3.What payment methods are accepted for SMA4F56AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA4F56AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA4F56AH?
SMA4F56AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA4F56AH 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 SMA4F56AH?
For technical support, including SMA4F56AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA4F56AH requirements.
6.How does Aetrix verify that SMA4F56AH is sourced from the original manufacturer or authorized distributors?
All SMA4F56AH 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 SMA4F56AH meets industry standards.
7.What is the process for return or replacement of SMA4F56AH?
All SMA4F56AH units undergo pre-shipment inspection (PSI). If there is an issue with SMA4F56AH, 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 SMA4F56AH part is unused and in its original packaging.
Return procedure for SMA4F56AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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