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Taiwan Semiconductor Corporation SA43A
- Part No.:
- SA43A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA43A.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,019
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Product details
Overview
SA43A from Taiwan Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, designed for high-energy surge protection in automotive and industrial power rails. It features a 43 V working stand-off voltage (VWM), 47.8–52.8 V breakdown voltage (VBR) at 1 mA, 500 W peak pulse power (10/1000 µs), clamping voltage of 69.4 V at 7.5 A, and operates from −55 °C to +175 °C junction temperature.
For engineers reviewing the SA43A datasheet, SA43A pinout, SA43A application, or SA43A equivalent, this page delivers verified electrical parameters, mechanical packaging details, real-world protection use cases, and validated alternative parts - all aligned with AEC-Q101 qualification requirements and IEC 61249-2-21 halogen-free compliance.
Technical Context
The SA43A is a unidirectional silicon avalanche diode optimized for fast clamping of high-voltage transients on DC power lines. Its low dynamic impedance ensures stable clamping under 10/1000 µs surges up to 500 W, with typical reverse leakage <1 µA at 43 V and response time <1.0 ps from 0 V to VBR.
It meets AEC-Q101 stress test requirements for automotive-grade reliability and supports operation across −55 °C to +175 °C junction temperature range. The device uses pure tin-plated leads compliant with J-STD-002 solderability and passes JESD 201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous DC or RMS voltage the device blocks without clamping; defines safe operating margin before transient activation. |
| VBR @ IT=1 mA | 47.8–52.8 V - Measured breakdown voltage range at 1 mA test current; ensures consistent turn-on threshold across production lots. |
| VC @ IPPM=7.5 A | 69.4 V - Clamping voltage during 7.5 A peak pulse; determines maximum voltage seen by protected downstream circuitry. |
| PPK (10/1000 µs) | 500 W - Peak surge power handling capability; enables robust protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 surges. |
| IR @ VWM | <1 µA - Reverse leakage current at rated stand-off voltage; minimizes standby power loss and avoids false triggering. |
| TJ max | +175 °C - Maximum junction temperature rating; supports under-hood automotive placement and high-ambient industrial environments. |
| Package | DO-204AC (DO-15) - Industry-standard axial-leaded package with 0.400 g mass, UL 94V-0 molding compound, and polarity band marking. |
Pinout & Package
SA43A is a two-terminal unidirectional TVS diode in DO-204AC (DO-15) package. Cathode is marked by a band on the body; anode is unmarked. Leads are pure tin-plated and solderable per J-STD-002. Device polarity must be observed during PCB layout to ensure correct surge current path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge current return path | Connected to ground or low-impedance reference plane; completes clamping loop during transient events. |
| Cathode | Surge current input node | Connected to protected line (e.g., 48 V rail); conducts avalanche current when VLINE exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units, body electronics, and ADAS power supplies. |
| 500 W peak pulse power (10/1000 µs) | Withstands high-energy transients per ISO 7637-2 and IEC 61000-4-5 without degradation or thermal runaway. |
| Clamping voltage ≤69.4 V at 7.5 A | Ensures protected ICs (e.g., MCU power pins, CAN transceivers) remain below absolute maximum ratings during surge events. |
| Reverse leakage <1 µA at 43 V | Minimizes quiescent current draw in always-on systems such as telematics and battery monitoring circuits. |
| Halogen-free & RoHS compliant | Fulfills environmental compliance requirements per IEC 61249-2-21 and EU Directive 2011/65/EU. |
Applications
| Automotive Power Rail Protection | Industrial 48 V DC Distribution |
|---|---|
Use Scenario: Protecting 48 V battery-fed ECUs from load dump and alternator-induced surges in passenger vehicles and commercial trucks. IC Role / Device Role: Unidirectional TVS placed between battery rail and primary regulator input to clamp transients before LDO or DC-DC stage. Use Value: Limits peak voltage to ≤69.4 V during 12 V/48 V load dump events, preventing damage to 75 V-rated power management ICs. |
Use Scenario: Safeguarding programmable logic controllers (PLCs) and motor drives powered from 48 V industrial DC bus. IC Role / Device Role: Primary overvoltage clamp on main power input, coordinated with upstream fuses and downstream TVS arrays. Use Value: Absorbs repetitive switching transients from inductive loads (e.g., solenoids, contactors) without derating or failure. |
| LED Driver Input Stage | Telecom Power Interface |
Use Scenario: Front-end protection for constant-current LED drivers used in street lighting and vehicle headlights. IC Role / Device Role: Standoff-clamp element placed directly at DC input connector to shunt surge energy before driver IC and MOSFET gate circuitry. Use Value: Maintains 43 V working voltage margin while clamping to 69.4 V, preserving driver IC integrity during lightning-induced surges. |
Use Scenario: Secondary-side surge suppression on 48 V phantom power inputs of telecom base station RF modules. IC Role / Device Role: Final-stage TVS on power feed line to RF front-end ICs, complementing primary MOV-based AC/DC protection. Use Value: Provides sub-nanosecond response and low clamping voltage to protect sensitive GaN amplifiers and analog front-ends. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ43A | Same DO-204AC package, identical VWM (43 V), but higher clamping voltage (70.1 V at 7.5 A) and lower PPK (400 W). | Marginally less effective clamping in high-dI/dt scenarios; suitable where system-level coordination allows higher VC. | Select SMAJ43A only if supply chain constraints require Littelfuse sourcing; verify clamping margin against protected IC VABS MAX. |
| ON Semiconductor 1.5SMC43A | Same VWM and VBR range, but larger DO-214AB (SMC) package, higher thermal mass, and 1500 W PPK rating (10/1000 µs). | Requires PCB footprint change; better suited for high-repetition surge environments (e.g., factory automation). | Choose 1.5SMC43A when thermal cycling endurance or multi-pulse robustness is critical; not drop-in compatible due to package size. |
Compared with SA43A, SMAJ43A offers tighter supply chain availability but sacrifices 1.7 V clamping performance and 100 W surge capacity; 1.5SMC43A delivers superior power handling and thermal stability but mandates layout revision and increases board area by 3.5×.
Availability
SA43A is available at Aetrix Electronics and suitable for automotive ECU design, industrial 48 V power distribution, and LED driver protection requiring stable component supply across long product lifecycles.
Supply support for SA43A 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 headquartered in Hsinchu, Taiwan, specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs since 1979.
The SA Series was developed specifically for AEC-Q101-compliant automotive and harsh-environment industrial surge protection, emphasizing high-temperature reliability, tight parameter distribution, and halogen-free manufacturing.
FAQ
What is the maximum clamping voltage of SA43A under standard surge conditions?
The SA43A exhibits a maximum clamping voltage (VC) of 69.4 V when subjected to a 7.5 A peak pulse current with a 10/1000 µs waveform. This value is measured per IEC 61000-4-5 and defines the upper voltage limit imposed on protected circuitry during standardized surge events. The SA43A maintains this clamping performance across its full operating temperature range.
Is SA43A suitable for bidirectional transient protection?
No, SA43A is a unidirectional TVS diode and must be used with correct polarity - cathode connected to the protected line, anode to ground. For bidirectional protection, the SA43CA variant (not SA43A) is specified, with symmetrical breakdown in both directions. Using SA43A in reverse-biased configuration will result in forward conduction and potential failure.
Does SA43A meet AEC-Q101 qualification requirements?
Yes, SA43A is explicitly AEC-Q101 qualified per the manufacturer's documentation and ordering code suffix "A" (e.g., SA43A). It has passed stress tests including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing (uHAST), confirming suitability for automotive under-hood and chassis-mounted applications.
What is the reverse leakage current specification for SA43A at its working voltage?
At its 43 V working stand-off voltage (VWM), the SA43A guarantees reverse leakage current (IR) of less than 1 µA at 25 °C. This low leakage preserves system efficiency in always-on applications such as battery-backed sensors and telematics modules, and avoids false triggering in high-impedance sensing circuits.
Can SA43A be used in place of SA43 without modification?
No - SA43 and SA43A differ in breakdown voltage tolerance: SA43 has VBR = 47.8–58.4 V, while SA43A has tighter VBR = 47.8–52.8 V. Substituting SA43A for SA43 may reduce clamping margin in high-temperature operation due to lower upper VBR limit. Always verify VBR distribution against system surge margin requirements before interchange.
SA43A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- SA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 7.5A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA43A FAQ
1.How can I place an order for SA43A through Aetrix?
Please submit a Request for Quotation (RFQ) for SA43A 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 SA43A reliable?
The price and inventory of SA43A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA43A is usually 5 days.
3.What payment methods are accepted for SA43A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA43A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA43A?
SA43A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA43A 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 SA43A?
For technical support, including SA43A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA43A requirements.
6.How does Aetrix verify that SA43A is sourced from the original manufacturer or authorized distributors?
All SA43A 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 SA43A meets industry standards.
7.What is the process for return or replacement of SA43A?
All SA43A units undergo pre-shipment inspection (PSI). If there is an issue with SA43A, 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 SA43A part is unused and in its original packaging.
Return procedure for SA43A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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