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Taiwan Semiconductor Corporation SMA4S43AH
- Part No.:
- SMA4S43AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-128
- Datasheet:
-
SMA4S43AH.pdf
- Description:
- TVS DIODE 43VWM 69.8VC SOD128
- Quantity:
- Payment:
- Shipping:
Inventory:9,309
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Product details
Overview
SMA4S43AH from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode with a 43V working stand-off voltage, 48.1–53.1V breakdown voltage at 1mA, and 69.8V clamping voltage at 5.7A peak pulse current; it is AEC-Q101 qualified and used in automotive BLDC motor control and battery management systems.
For engineers reviewing the SMA4S43AH datasheet, SMA4S43AH pinout, SMA4S43AH application, or SMA4S43AH equivalent, key selection criteria include unidirectional polarity, SOD-128 package thermal performance (RθJL = 20°C/W), 175°C max junction temperature, and compliance with JESD201 Class 2 whisker testing and RoHS/halogen-free standards.
Technical Context
The SMA4S43AH operates as a unidirectional avalanche diode for transient overvoltage protection in DC power rails. Its glass-passivated junction ensures stable VBR with a temperature coefficient of 0.095%/°C, and its 10/1000μs waveform rating supports 400W non-repetitive peak pulse power dissipation.
Designed for high-reliability automotive environments, it features moisture sensitivity level 1 (per J-STD-020), UL 94V-0 molding compound, matte tin-plated leads solderable per J-STD-002, and a maximum junction temperature of 175°C - enabling operation in under-hood and battery-pack applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA |
| VBR @ IT=1mA | 48.1–53.1 V - Verified breakdown range ensuring robust turn-on margin above VWM |
| VC @ IPPM=5.7A | 69.8 V - Clamped voltage during 10/1000µs surge, limiting downstream IC stress |
| PPPM | 400 W - Peak pulse power handling capability for short-duration transients |
| 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 - Supports operation in automotive under-hood and battery thermal zones |
Pinout & Package
Package: SOD-128 - Surface-mount, unidirectional TVS diode with cathode band marking; case meets UL 94V-0, weight ≈0.028g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry during forward conduction | Connected to lower-potential side of protected line; enables unidirectional clamping |
| Cathode | Current exit during reverse-biased clamping | Marked by band; connected to higher-potential rail (e.g., battery+ or supply rail) |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Glass-passivated junction | Ensures stable VBR and low parameter drift across lifetime and temperature |
| VBR tempco: 0.095%/°C | Minimizes voltage shift over −55°C to +175°C operating range |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking preconditioning |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and environmental compliance requirements for automotive OEMs |
Applications
| Automotive Power Distribution | BLDC Motor Drive Protection |
|---|---|
Use Scenario: Protecting 48V battery-fed power distribution modules against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed at input stage of DC-DC converters and fuse boxes. Use Value: Limits transient voltage to ≤69.8V during 5.7A surges, preserving downstream PMICs and microcontrollers rated for 45V absolute max. | Use Scenario: Safeguarding gate drivers and Hall sensors in 3-phase BLDC inverters against back-EMF-induced transients. IC Role / Device Role / Timing Role: Rail clamp on low-side MOSFET source or phase-leg supply lines. Use Value: Responds within nanoseconds to 400W pulses, preventing latch-up or oxide rupture in 40V-rated driver ICs. |
| Battery Management Systems | LED Driver Input Protection |
Use Scenario: Guarding cell monitoring ICs and Coulomb counters in 12–48V Li-ion packs against hot-plug and charge interruption transients. IC Role / Device Role / Timing Role: Standoff protector on pack voltage sense and communication lines (e.g., SMBus, CAN). Use Value: Maintains <1µA leakage at 43V, avoiding measurement error while clamping >48V surges to safe levels. | Use Scenario: Suppressing switching noise and inductive kickback in constant-current LED drivers for automotive lighting. IC Role / Device Role / Timing Role: Parallel-connected TVS on input capacitor node of buck/boost LED controllers. Use Value: Withstands repetitive 10/1000µs pulses up to 400W, extending electrolytic capacitor life and reducing EMI filter burden. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43A | Lower PPPM (400W same), but higher VC (72.7V @ 5.5A); RθJA = 65°C/W vs. 62°C/W | Marginally less effective clamping in high-current transients; slightly reduced thermal efficiency on PCB | Acceptable where 2.9V higher clamping voltage is tolerable and layout allows minor derating |
| SMB43A | Same VWM/VBR range, but lower PPPM (600W), larger SMB package (higher RθJA = 70°C/W) | Higher surge capacity but less space-efficient; requires larger pad area and impacts board density | Preferred when system-level surge tests exceed 400W or when legacy SMB footprint must be retained |
Compared with SMAJ43A and SMB43A, the SMA4S43AH delivers tighter clamping (69.8V), superior thermal resistance (RθJL = 20°C/W), and AEC-Q101 qualification - making it optimal for space-constrained, thermally demanding automotive modules where precise voltage limiting and reliability are critical.
Availability
SMA4S43AH is available at Aetrix Electronics and suitable for automotive power distribution, BLDC motor drives, battery management systems, and LED lighting applications requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for SMA4S43AH 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, serving global automotive, industrial, and consumer markets since 1979.
The SMA4SxxAH series is part of TSC's AEC-Q101-qualified TVS portfolio, engineered specifically for high-energy transient suppression in 12V–60V automotive subsystems with stringent thermal and reliability demands.
FAQ
What is the clamping voltage of the SMA4S43AH under a 10/1000µs surge?
The SMA4S43AH has a maximum clamping voltage (VC) of 69.8 V at a peak pulse current (IPPM) of 5.7 A with a 10/1000 µs waveform. This value is measured per the standard test condition defined in the datasheet and reflects the actual voltage seen by downstream circuitry during transient events. The SMA4S43AH maintains this clamping performance across its specified junction temperature range.
Is the SMA4S43AH suitable for automotive applications?
Yes, the SMA4S43AH is AEC-Q101 qualified and designed for automotive use. It supports operating temperatures from −55°C to +175°C, passes JESD201 Class 2 whisker testing, and features glass-passivated junctions and halogen-free construction. These attributes make the SMA4S43AH appropriate for under-hood and battery-pack environments where reliability and thermal stability are essential.
What is the polarity configuration of the SMA4S43AH?
The SMA4S43AH is a unidirectional TVS diode, meaning it conducts only in reverse bias during overvoltage events and blocks voltage in the forward direction. Its cathode is marked by a band on the SOD-128 package. This polarity enables precise clamping on positive-rail protection schemes without interfering with normal forward-biased operation.
How does the thermal performance of the SMA4S43AH compare to similar SOD-128 TVS diodes?
The SMA4S43AH achieves a junction-to-lead thermal resistance (RθJL) of 20°C/W and junction-to-ambient (RθJA) of 62°C/W when mounted on a 5 mm × 5 mm copper pad. This outperforms many competing SOD-128 TVS devices, which typically specify RθJL ≥ 25°C/W. The lower RθJL directly improves power handling sustainability during repeated transients in the SMA4S43AH.
What packaging and reel quantity is available for the SMA4S43AH?
The SMA4S43AH is supplied in SOD-128 package format on tape-and-reel, with 14,000 units per reel. This standard packaging supports automated SMT placement and is compatible with industry-standard pick-and-place equipment. Reel markings include the part number "SMA4S43AH" and date code per Taiwan Semiconductor's ordering specification.
SMA4S43AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- SOD-128
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 43V
- Voltage - Breakdown (Min):
- 48.1V
- Voltage - Clamping (Max) @ Ipp:
- 69.8V
- Current - Peak Pulse (10/1000µs):
- 5.7A
- 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:
- SOD-128
SMA4S43AH FAQ
1.How can I place an order for SMA4S43AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA4S43AH 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 SMA4S43AH reliable?
The price and inventory of SMA4S43AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA4S43AH is usually 5 days.
3.What payment methods are accepted for SMA4S43AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA4S43AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA4S43AH?
SMA4S43AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA4S43AH 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 SMA4S43AH?
For technical support, including SMA4S43AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA4S43AH requirements.
6.How does Aetrix verify that SMA4S43AH is sourced from the original manufacturer or authorized distributors?
All SMA4S43AH 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 SMA4S43AH meets industry standards.
7.What is the process for return or replacement of SMA4S43AH?
All SMA4S43AH units undergo pre-shipment inspection (PSI). If there is an issue with SMA4S43AH, 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 SMA4S43AH part is unused and in its original packaging.
Return procedure for SMA4S43AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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