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Taiwan Semiconductor Corporation SA51A
- Part No.:
- SA51A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA51A.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,580
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Product details
Overview
SA51A from Taiwan Semiconductor is a unidirectional 51V transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, rated for 500W peak pulse power at 10/1000μs, with 56.7–62.7V breakdown voltage, 82.4V clamping voltage at 6.3A, and <1μA reverse leakage above 10V - used for automotive ESD and inductive load surge protection in power supply inputs and CAN/LIN bus interfaces.
For engineers reviewing the SA51A datasheet, SA51A pinout, SA51A application, or SA51A equivalent, key selection criteria include its 51V working stand-off voltage, AEC-Q101 qualification (per SA51AH variant), low clamping ratio (VC/VBR ≈ 1.31), DO-15 mechanical compatibility, and thermal derating behavior up to 175°C junction temperature.
Technical Context
The SA51A operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its specified VBR range (56.7–62.7V at 1mA test current). Its clamping action limits transient energy to ≤82.4V at 6.3A peak pulse current, enabling robust protection of downstream 5V–48V logic and interface ICs against IEC 61000-4-2 (±15kV contact) and ISO 7637-2 (inductive load dump) threats.
Designed for surface-mount or through-hole mounting on 10×10 mm copper pads, it sustains 3W steady-state power at TL = 75°C and handles 70A non-repetitive forward surge (8.3ms half-sine), with polarity marked by cathode band and RoHS/halogen-free compliance per IEC 61249-2-21.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - maximum continuous reverse operating voltage before conduction begins; sets upper limit for protected circuit's normal operating rail. |
| VBR min/max | 56.7 / 62.7 V @ 1 mA - guaranteed avalanche initiation window; ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 82.4 V @ 6.3 A - clamped voltage during 10/1000μs surge; determines worst-case stress on downstream components. |
| PPK | 500 W - peak pulse power handling per single 10/1000μs waveform; defines transient energy absorption capability. |
| TJ max | +175 °C - maximum junction temperature; enables operation in under-hood automotive environments without thermal shutdown. |
| IR @ VWM | <1 μA - reverse leakage at 51 V; negligible power loss and signal integrity impact in high-impedance sensing or bias networks. |
Pinout & Package
Package: DO-204AC (DO-15), axial lead, epoxy-molded case with UL 94V-0 rating, pure tin-plated leads, cathode band marking polarity for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-impedance return plane; completes clamping loop during overvoltage events. |
| Cathode | Protected line connection | Connected to the line being protected (e.g., 51V supply rail); reverse-biased during normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified variant available | SA51AH meets automotive reliability standards for temperature cycling, HTRB, and ESD - required for engine control, body electronics, and ADAS modules. |
| Clamping ratio VC/VBR | ≈1.31 (82.4V / 62.7V) - low ratio minimizes voltage overshoot during transients, preserving margin for 5V/12V/24V ICs. |
| Fast response time | <1.0 ps from 0 V to VBR - sub-picosecond turn-on ensures suppression before sensitive nodes experience damaging overvoltage. |
| Low IR at VWM | <1 μA at 51 V - avoids loading of high-impedance reference or feedback circuits in precision power supplies. |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive - supports green manufacturing and end-of-life recycling requirements. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 51V battery-fed ECUs from load dump and alternator ripple in 48V mild-hybrid systems. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC input stage to clamp surges before LDOs or buck controllers. Use Value: Withstands 500W pulses and operates up to +175°C, ensuring reliability in under-hood environments where ambient exceeds 125°C. | Use Scenario: Shielding RS-485 transceivers and analog sensor front-ends from EFT bursts in factory automation PLCs. IC Role / Device Role / Timing Role: Placed at connector entry point to shunt fast transients (IEC 61000-4-4, 40A, 5/50ns) away from PHY layer. Use Value: Sub-1ps response and 82.4V clamping prevent latch-up or damage to ±10V common-mode tolerant receivers. |
| LED Driver Output Protection | Telecom DC Power Input Protection |
Use Scenario: Safeguarding constant-current LED drivers from inductive kickback when driving solenoid-based lighting loads. IC Role / Device Role / Timing Role: Connected anode-to-ground, cathode-to-output node to absorb reverse EMF spikes during MOSFET switch-off. Use Value: 70A peak forward surge rating allows repeated switching of >100mH inductive loads without degradation. | Use Scenario: Securing -48V telecom rectifier outputs against lightning-induced surges entering via distribution panels. IC Role / Device Role / Timing Role: Mounted at PSE (power sourcing equipment) input to clamp common-mode transients before DC/DC isolation stages. Use Value: 500W 10/1000μs rating and DO-15 mechanical robustness support Telcordia GR-1089-CORE Level 3 immunity compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A (Bourns) | Same DO-214AA package, identical 51V VWM and 82.4V VC, but rated for 600W PPK and higher IPPM (9.2A). | Higher surge margin suits telecom central office equipment; SMBJ51A has larger footprint than DO-15. | Select SMBJ51A when board space permits and >500W surge headroom is required; not drop-in due to different package outline. |
| P6KE51A (Littelfuse) | DO-204AC (DO-15) package, same pinout and VWM, but lower PPK (600W), higher VC (83.3V), and wider VBR tolerance (56.7–62.7V → 56.7–66.3V). | Legacy industrial designs using P6KE series may reuse layout; P6KE51A lacks AEC-Q101 option. | Choose P6KE51A for cost-sensitive legacy replacements where AEC-Q101 is not mandated; verify VC margin for critical 5V logic rails. |
Compared with SA51A, SMBJ51A offers higher surge capacity in a larger package, while P6KE51A provides direct DO-15 compatibility but with looser VBR control and no automotive qualification - making SA51A optimal for new AEC-Q101-compliant 48V systems needing precise clamping and minimal footprint.
Availability
SA51A is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface protection, and 48V LED driver output safeguarding requiring stable component supply across multi-year production cycles.
Supply support for SA51A 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 Taiwanese semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs since 1979.
The SA Series TVS diodes are engineered for high-reliability transient suppression in automotive, industrial, and telecom infrastructure - emphasizing AEC-Q101 qualification, tight parameter tolerances, and robust surge endurance.
FAQ
What is the breakdown voltage range of the SA51A?
The SA51A has a guaranteed breakdown voltage (VBR) range of 56.7 V to 62.7 V at 1 mA test current, measured per ANSI/IEEE C62.35. This tight tolerance ensures consistent clamping onset across units and temperature, critical for protecting 51V nominal systems without premature conduction during normal operation.
Is the SA51A suitable for automotive applications?
Yes - the SA51A is part of the AEC-Q101-qualified SA Series (designated SA51AH in qualified version). It meets stress tests including temperature cycling, high-temperature reverse bias, and ESD, making SA51A appropriate for engine control units, body control modules, and ADAS power domains where reliability under thermal and electrical stress is mandatory.
What is the clamping voltage of the SA51A at its rated peak pulse current?
The SA51A clamps to a maximum of 82.4 V at its rated peak pulse current of 6.3 A (10/1000μs waveform). This value is confirmed in the manufacturer's electrical characteristics table and defines the upper voltage limit imposed on protected circuits during standardized surge events.
Does the SA51A have polarity marking, and how is it oriented in circuit?
Yes - the SA51A features a cathode band marking on the DO-204AC (DO-15) package. In unidirectional configuration, the cathode connects to the line being protected (e.g., 51V rail), and the anode connects to ground. This orientation ensures reverse-biased operation during normal conditions and rapid avalanche conduction during overvoltage.
How does the SA51A compare to the SA51 (non-A) variant?
The SA51A differs from SA51 in tighter VBR tolerance (56.7–62.7 V vs. 56.7–69.3 V), lower clamping voltage (82.4 V vs. 91.1 V), and improved temperature coefficient (61 mV/°C vs. 66 mV/°C). These enhancements make SA51A preferable for precision-clamping applications where voltage margin and thermal stability are critical.
SA51A 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA51A FAQ
1.How can I place an order for SA51A through Aetrix?
Please submit a Request for Quotation (RFQ) for SA51A 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 SA51A reliable?
The price and inventory of SA51A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA51A is usually 5 days.
3.What payment methods are accepted for SA51A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA51A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA51A?
SA51A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA51A 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 SA51A?
For technical support, including SA51A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA51A requirements.
6.How does Aetrix verify that SA51A is sourced from the original manufacturer or authorized distributors?
All SA51A 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 SA51A meets industry standards.
7.What is the process for return or replacement of SA51A?
All SA51A units undergo pre-shipment inspection (PSI). If there is an issue with SA51A, 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 SA51A part is unused and in its original packaging.
Return procedure for SA51A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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