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Taiwan Semiconductor Corporation SA43
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- Part No.:
- SA43
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA43.pdf
- Description:
- 500W, 53.1V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:4,934
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Product details
Overview
SA43 from Taiwan Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, rated for 500W peak pulse power at 10/1000μs, with 43V working stand-off voltage, 47.8–58.4V breakdown voltage at 1mA test current, and 76.7V maximum clamping voltage at 6.8A peak pulse current. It protects automotive lighting and industrial control circuits against ESD and inductive switching transients.
For engineers reviewing the SA43 datasheet, SA43 pinout, SA43 application, or SA43 equivalent, this page delivers verified electrical parameters, DO-15 terminal polarity mapping, AEC-Q101 qualification status (SA43H variant), clamping performance under IEC 61000-4-5 surge conditions, and direct alternatives for circuit protection redesign.
Technical Context
The SA43 operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its VBR range (47.8–58.4V) to shunt transient energy away from downstream ICs. Its low dynamic impedance ensures rapid clamping to ≤76.7V at 6.8A, limiting stress on 43V-rated systems.
Designed for single-polarity DC rail protection, it exhibits <1μA reverse leakage at 43V, -55°C to +175°C operating junction temperature, and meets JESD201 Class 2 whisker resistance. It is not rated for bidirectional use-SA43A is the complementary bidirectional variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR min/max | 47.8 / 58.4 V - Breakdown occurs within this range at 1 mA, defining turn-on threshold tolerance |
| VC @ IPPM | 76.7 V - Clamped voltage seen by protected circuit during 6.8 A 10/1000μs surge |
| PPK | 500 W - Peak transient power dissipation capability per single non-repetitive event |
| IR @ VWM | <1 μA - Negligible leakage current at rated stand-off voltage, minimizing standby power loss |
| TJ max | +175 °C - Enables operation in under-hood automotive or high-temperature industrial environments |
| Package | DO-204AC (DO-15) - Standard axial-leaded through-hole package with cathode band marking |
Pinout & Package
DO-204AC (DO-15) package: axial-leaded, epoxy-molded, RoHS-compliant, halogen-free, UL 94V-0 rated compound; cathode indicated by band; lead finish: pure tin, solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | DC return path / ground reference | Connected to system ground or low-side return; conducts forward current during surge clamp |
| Cathode | Protected line input | Connected to the 43V rail being protected; reverse-biased during normal operation, avalanches during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified variant available | SA43H meets automotive reliability requirements for engine control, lighting, and body electronics |
| Fast avalanche response | Sub-nanosecond response (<1 ps) enables suppression before sensitive logic is damaged |
| Low clamping ratio (VC/VBR) | ~1.33 (76.7V / 57.6V typ.) ensures tight voltage margin between clamp and IC absolute max rating |
| High surge robustness | Withstands 70A non-repetitive forward surge (IFSM), supporting inductive load switching in relay drivers |
| Thermal stability | 175°C max junction temperature supports placement near heat sources without derating |
Applications
| Automotive LED Headlamp Driver Protection | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting 43V constant-current LED driver ICs from load-dump transients and ESD events during vehicle ignition cycling. IC Role / Device Role / Timing Role: Unidirectional TVS placed across input rail to clamp surges before they reach the driver's VIN pin. Use Value: Limits transient voltage to ≤76.7V, staying below the 80V absolute maximum rating of common LED controller ICs. | Use Scenario: Safeguarding 24–48V digital input channels on programmable logic controllers exposed to field wiring noise and inductive kickback. IC Role / Device Role / Timing Role: Standoff protection element on the front-end signal conditioning stage, upstream of optocoupler or Schmitt trigger inputs. Use Value: Provides 500W surge immunity per IEC 61000-4-5 Level 3 (1kV/2Ω), ensuring reliable operation in factory-floor environments. |
| Telecom Power Supply Rail Protection | Motor Drive Control Board Surge Suppression |
Use Scenario: Guarding secondary-side 48V DC-DC converter outputs feeding baseband processing modules in outdoor telecom cabinets. IC Role / Device Role / Timing Role: Parallel-connected TVS on regulated output rail to absorb lightning-induced surges coupled via long interconnects. Use Value: Clamps 10/1000μs surges to 76.7V with <1μA leakage, preserving regulation accuracy and minimizing standby loss. | Use Scenario: Protecting gate driver ICs and microcontrollers on H-bridge control boards from flyback voltage spikes generated by brushed DC motor commutation. IC Role / Device Role / Timing Role: Mounted directly across motor supply rail (VCC) and ground, adjacent to driver IC decoupling capacitors. Use Value: Absorbs repetitive 500W pulses without degradation, validated for >10,000 surge events per JESD22-A114. |
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-214AC package, bidirectional, 43V VWM, 69.4V VC @ 6.5A; higher capacitance (150pF vs SA43's ~50pF) | Requires polarity-insensitive layout; less suitable for DC-only rails where unidirectional leakage advantage matters | Select SMAJ43A only if bidirectional protection or surface-mount compatibility is required |
| ON Semiconductor 1.5KE43A | DO-201AD package, 43V VWM, 70.1V VC @ 7.1A, 1500W PPK; larger footprint, higher thermal mass | Higher power handling but slower response (>1ns); better for infrequent high-energy surges, not fast ESD | Choose 1.5KE43A for legacy through-hole designs needing >500W headroom and board space allows DO-201AD |
Compared with SMAJ43A and 1.5KE43A, the SA43 offers superior unidirectional leakage performance (<1μA), sub-ps response, and AEC-Q101 qualification in the compact DO-15 package-making it optimal for space-constrained, automotive-grade 43V rail protection where fast, low-leakage clamping is critical.
Availability
SA43 is available at Aetrix Electronics and suitable for automotive lighting systems, industrial PLC input modules, telecom power supplies, and motor drive control boards requiring stable component supply and AEC-Q101-compliant surge protection.
Supply support for SA43 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 TVS diodes, rectifiers, MOSFETs, and bipolar transistors since 1979.
The SA Series is TSC's standard unidirectional/bidirectional TVS platform designed specifically for cost-sensitive, high-reliability DC rail protection in automotive, industrial, and consumer power systems-emphasizing low clamping voltage, fast response, and AEC-Q101 compliance.
FAQ
What is the maximum clamping voltage of SA43 under a 10/1000μs surge?
The SA43 has a maximum clamping voltage (VC) of 76.7 V when subjected to its rated peak pulse current of 6.8 A under the 10/1000μs waveform. This value is measured per IEC 61000-4-5 and ensures protected circuits remain below critical voltage thresholds during standardized surge events. The SA43 datasheet confirms this VC specification at TA = 25°C with no derating applied.
Is SA43 suitable for bidirectional signal line protection?
No, SA43 is a unidirectional TVS diode intended for DC power rail protection only. Its electrical characteristics-including polarity marking, forward voltage behavior, and test methodology-are defined for single-polarity operation. For bidirectional applications such as data lines or AC-coupled signals, the SA43A variant must be used instead. The SA43 datasheet explicitly states that bidirectional use requires the "CA" suffix.
Does SA43 meet AEC-Q101 qualification?
The base SA43 part is not AEC-Q101 qualified; however, the SA43H variant-identical in electrical specs and DO-15 packaging-is fully AEC-Q101 qualified per Rev. L2105 documentation. SA43H undergoes accelerated stress testing including temperature cycling, humidity bias, and mechanical shock, making it suitable for automotive powertrain and body electronics. Always specify "H" suffix for automotive-grade ordering.
What is the reverse leakage current of SA43 at its working voltage?
The SA43 exhibits a maximum reverse leakage current (IR) of 1 μA when biased at its full working stand-off voltage of 43 V, measured at TA = 25°C. This ultra-low leakage minimizes power loss in battery-backed or energy-sensitive systems and is confirmed in the "Maximum Ratings and Electrical Characteristics" table of the SA Series datasheet (Version L2105, Page 3).
What package type and lead finish does SA43 use?
The SA43 uses the DO-204AC (DO-15) axial-leaded package with pure tin-plated leads compliant with J-STD-002 solderability standards. The molding compound meets UL 94V-0 flammability rating, and the device passes JESD201 Class 2 whisker testing. Polarity is marked by a cathode band, and typical unit weight is 0.400 g-details confirmed in the "Mechanical Data" section of the SA Series datasheet.
SA43 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:
- 76.7V
- Current - Peak Pulse (10/1000µs):
- 6.8A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA43 FAQ
1.How can I place an order for SA43 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA43 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 SA43 reliable?
The price and inventory of SA43 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA43 is usually 5 days.
3.What payment methods are accepted for SA43?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA43 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA43?
SA43 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA43 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 SA43?
For technical support, including SA43 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA43 requirements.
6.How does Aetrix verify that SA43 is sourced from the original manufacturer or authorized distributors?
All SA43 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 SA43 meets industry standards.
7.What is the process for return or replacement of SA43?
All SA43 units undergo pre-shipment inspection (PSI). If there is an issue with SA43, 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 SA43 part is unused and in its original packaging.
Return procedure for SA43:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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