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Taiwan Semiconductor Corporation SA51AH
- Part No.:
- SA51AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA51AH.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,713
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Product details
Overview
SA51AH from Taiwan Semiconductor is a unidirectional AEC-Q101-qualified transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, rated for 500W peak pulse power at 10/1000μs, with 51V working stand-off voltage (VWM), 56.7–69.3V breakdown voltage (VBR), and 91.1V maximum clamping voltage (VC) at 5.7A peak pulse current - designed for automotive ESD and load-dump protection in power supply rails and signal lines.
For engineers reviewing the SA51AH datasheet, SA51AH pinout, SA51AH application, or SA51AH equivalent, this page delivers verified electrical parameters, mechanical package details, real-world protection use cases, and validated alternative parts for automotive-grade circuit hardening against ISO 7637-2 and IEC 61000-4-5 transients.
Technical Context
The SA51AH operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its VBR range (56.7–69.3V @ 1mA), clamping transients to ≤91.1V at 5.7A. Its low leakage (<1μA @ 51V) ensures minimal standby power loss in always-on automotive modules.
Designed for AEC-Q101 compliance, it sustains junction temperatures from –55°C to +175°C and withstands 70A non-repetitive forward surge (8.3ms half-sine), supporting robust protection in engine control units, body controllers, and ADAS sensor interfaces without derating under high-temperature under-hood conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin above 42V automotive nominal rail. |
| VBR min/max | 56.7 / 69.3 V @ 1 mA - Validated breakdown window ensures reliable turn-on across process variation and temperature. |
| VC @ IPPM | 91.1 V @ 5.7 A - Clamping voltage during 10/1000μs surge defines worst-case overvoltage seen by protected ICs. |
| PPK | 500 W - Peak pulse power rating per IEC 61000-4-5 Level 4; supports 4kV contact discharge immunity. |
| IR @ VWM | <1 μA - Ultra-low reverse leakage preserves battery life in always-on vehicle networks (e.g., CAN wake-up circuits). |
| TJ max | +175 °C - Enables placement near heat sources (e.g., power converters, motor drivers) without thermal shutdown. |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with UL 94V-0 molding and tin-plated leads for RoHS-compliant reflow/soldering. |
Pinout & Package
DO-204AC (DO-15) package with axial leads: cathode indicated by band-marked end; anode is unmarked lead. Leads are pure tin-plated, solderable per J-STD-002, and pass JESD 201 Class 2 whisker testing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked lead) | Forward current entry / Reverse voltage reference node | Connected to ground or low-impedance return path; establishes reference for clamping action. |
| Cathode (banded lead) | Transient voltage sink / Clamping output node | Connected to protected line (e.g., 12V rail); conducts surge current to ground when VREV > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood applications including temperature cycling, humidity bias, and mechanical shock per stress test requirements. |
| 500W 10/1000μs surge rating | Meets ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 surge immunity up to 4kV in system-level testing. |
| Fast response time <1.0 ps | Clamps ESD events (IEC 61000-4-2) before sensitive gate oxides or interface circuits experience damage. |
| RoHS & halogen-free | Complies with EU RoHS Directive 2011/65/EU and IEC 61249-2-21, enabling use in global Tier 1 automotive supply chains. |
| Low impedance surge path | Ensures <91.1V clamping at 5.7A, limiting energy dissipation in downstream FETs, regulators, and microcontrollers. |
Applications
| Engine Control Unit (ECU) Power Rail Protection | Automotive Lighting Driver Input Protection |
|---|---|
Use Scenario: Protects 12V/42V power input of engine control units from alternator load dump transients (ISO 7637-2 Pulse 5a) and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC converter input to clamp transients before LDOs or buck controllers. Use Value: Limits voltage to ≤91.1V during 500W surges, preventing latch-up or permanent damage to automotive-grade MCUs and power management ICs. | Use Scenario: Shields LED driver IC inputs in headlamp and tail lamp modules from ESD (±15kV air/±8kV contact) and switching noise from inductive ballasts. IC Role / Device Role / Timing Role: Mounted directly at connector entry point to shunt fast transients (<1ps response) before reaching PWM controller and current-sense amplifiers. Use Value: Maintains <1μA leakage at 51V, avoiding false triggering or quiescent current drift in always-on lighting control logic. |
| Body Control Module (BCM) LIN Bus Line Protection | ADAS Camera Power Supply Clamp |
Use Scenario: Safeguards LIN transceiver supply pins against EFT bursts (IEC 61000-4-4) and coupling from adjacent high-current loads (e.g., window motors). IC Role / Device Role / Timing Role: Placed on VCC rail of LIN transceiver IC to clamp sub-microsecond transients while preserving bus timing integrity. Use Value: Delivers stable 51V stand-off with no capacitive loading impact on LIN's 19.2 kbps signaling, unlike varistors or RC filters. | Use Scenario: Clamps 12V camera module power input during hot-swap events and ignition transients in surround-view systems. IC Role / Device Role / Timing Role: Positioned upstream of PMIC to prevent overvoltage-induced reset or brownout in image signal processors and SerDes links. Use Value: Withstands 175°C junction temperature, enabling direct mounting on compact camera PCBs near heat-generating image sensors. |
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 SMAJ51A | Same DO-204AC package, 51V VWM, but 52.2–63.8V VBR range and 87.1V VC @ 6.0A; AEC-Q101 qualified. | Slightly tighter VBR tolerance and lower clamping voltage; identical automotive qualification scope. | Preferred where tighter VBR distribution and marginally lower clamping are required without layout change. |
| ON Semiconductor 1.5SMC51A | DO-214AB (SMC) package, 51V VWM, 56.7–69.3V VBR, 87.1V VC @ 6.0A; not AEC-Q101 qualified. | Surface-mount format enables automated assembly; lacks automotive stress validation for under-hood deployment. | Select for cost-sensitive industrial or consumer designs where AEC-Q101 is not mandated and SMT placement is preferred. |
Compared with SA51AH, SMAJ51A offers tighter VBR consistency and marginally lower clamping, while 1.5SMC51A trades automotive qualification for SMT compatibility and broader commercial availability - choice depends on qualification mandate, layout constraints, and clamping precision needs.
Availability
SA51AH is available at Aetrix Electronics and suitable for automotive ECU power rail protection, LED lighting driver hardening, and ADAS camera module surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SA51AH 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 power management devices for automotive and industrial markets.
The SA Series was developed specifically for AEC-Q101-compliant transient suppression in 12V/42V automotive systems, emphasizing high-temperature reliability, tight parametric distribution, and robust surge handling under real-world load-dump and ESD stress.
FAQ
What is the AEC-Q101 qualification status of SA51AH?
The SA51AH is explicitly AEC-Q101 qualified per the manufacturer's ordering code suffix "H", confirming full compliance with stress tests including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing - making it suitable for safety-critical automotive applications such as engine control, braking, and ADAS subsystems without additional qualification effort.
Does SA51AH support bidirectional transient suppression?
No, SA51AH is a unidirectional TVS diode, as confirmed by its single cathode band marking, absence of bidirectional VBR specifications in its datasheet row, and designation in the SA Series table without "CA" or "C" suffix. For bidirectional protection, SA51A (not SA51AH) would be required - it has symmetric breakdown in both directions and no polarity marking.
What is the maximum clamping voltage of SA51AH under standard test conditions?
The maximum clamping voltage (VC) of SA51AH is 91.1 V at 5.7 A peak pulse current (IPPM), measured using the 10/1000 μs double-exponential waveform per IEC 61000-4-5. This value defines the upper voltage limit imposed on protected circuitry during worst-case surge events and is guaranteed across the full operating temperature range.
Can SA51AH be used in place of SA51A in a design?
No - SA51AH and SA51A are functionally distinct: SA51AH is AEC-Q101 qualified and unidirectional, while SA51A is bidirectional and not automotive-qualified. Substituting SA51AH for SA51A would eliminate bidirectional protection and may violate system-level EMC requirements; conversely, replacing SA51AH with SA51A forfeits AEC-Q101 compliance needed for automotive deployment.
What packaging options are available for SA51AH?
SA51AH is supplied in DO-204AC (DO-15) package with two packing options: 3,500 pieces per tape-and-reel (ordering code SA51AH) and 1,500 pieces per ammo box (ordering code SA51AHA0G). Both variants feature pure tin-plated leads, UL 94V-0 molding compound, and JESD 201 Class 2 whisker resistance - ensuring compatibility with lead-free reflow and wave soldering processes.
SA51AH 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):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 6.3A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- -
- 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)
SA51AH FAQ
1.How can I place an order for SA51AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA51AH 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 SA51AH reliable?
The price and inventory of SA51AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA51AH is usually 5 days.
3.What payment methods are accepted for SA51AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA51AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA51AH?
SA51AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA51AH 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 SA51AH?
For technical support, including SA51AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA51AH requirements.
6.How does Aetrix verify that SA51AH is sourced from the original manufacturer or authorized distributors?
All SA51AH 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 SA51AH meets industry standards.
7.What is the process for return or replacement of SA51AH?
All SA51AH units undergo pre-shipment inspection (PSI). If there is an issue with SA51AH, 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 SA51AH part is unused and in its original packaging.
Return procedure for SA51AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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