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Taiwan Semiconductor Corporation SA51C
- Part No.:
- SA51C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA51C.pdf
- Description:
- 500W, 63V, BIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:5,795
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Product details
Overview
SA51C from Taiwan Semiconductor is a unidirectional 500W transient voltage suppressor (TVS) diode with 51V working stand-off voltage, 56.7–69.3V breakdown voltage at 1mA test current, and 91.1V maximum clamping voltage at 5.7A peak pulse current. It features low leakage (<1μA above 10V), fast response (<1.0ps), and DO-204AC (DO-15) package for automotive-grade surge protection in power supply rails.
For engineers reviewing the SA51C datasheet, SA51C pinout, SA51C application, or SA51C equivalent, this page delivers verified electrical parameters, clamping behavior under 10/1000μs transients, thermal derating curves, AEC-Q101 qualification status, and direct alternatives for ESD and inductive switching protection in 12V/24V systems.
Technical Context
The SA51C operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its VBR range (56.7–69.3V) to clamp transient energy into ground. Its low dynamic impedance ensures stable clamping up to 500W peak pulse power at TA = 25°C, with linear derating above ambient temperature per Fig.2.
Designed for single-polarity DC circuits, it exhibits <1.0ps response from 0V to VBR, 3.5V max forward voltage at 35A, and junction temperature tolerance from –55°C to +175°C - enabling use in under-hood automotive modules and industrial power converters where fast, repeatable surge suppression is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR @ IT=1mA | 56.7–69.3 V - Breakdown voltage range defining reliable avalanche onset threshold |
| VC @ IPPM=5.7A | 91.1 V - Clamped voltage during 10/1000μs surge, limiting downstream IC stress |
| PPK | 500 W - Peak pulse power handling capability per non-repetitive 1ms pulse |
| IR @ VWM | <1 μA - Ultra-low leakage ensuring minimal standby power loss in always-on systems |
| TJ max | +175 °C - Enables placement near heat sources like MOSFETs or transformers without derating |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with 0.400g mass and UL 94V-0 molding |
Pinout & Package
DO-204AC (DO-15) package with axial leads: cathode indicated by band marking; anode and cathode terminals are non-polarized in layout but functionally asymmetric for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side connection | Connected to protected line (e.g., 12V rail); conducts forward during fault only if polarity reversed |
| Cathode | Clamp/Ground reference | Connected to system ground; sinks surge current into ground plane during overvoltage event |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics |
| 500W 10/1000μs surge rating | Withstands ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 Level 3 surges without degradation |
| <1.0ps response time | Clamps transients before sensitive logic or analog circuitry experiences overvoltage stress |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and automotive ELV directive requirements |
| Low VF = 3.5V @ 35A | Minimizes forward conduction loss during high-current surge events, reducing thermal stress |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting 12V/24V power distribution networks in engine control modules from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and LDO input to absorb >100V transients within nanoseconds. Use Value: Prevents latch-up or permanent damage to microcontrollers and CAN transceivers during ISO 7637-2 Pulse 5a events. | Use Scenario: Shielding digital input channels of programmable logic controllers from inductive kickback of solenoid valves. IC Role / Device Role / Timing Role: Standoff device across optocoupler input terminals to shunt flyback energy before it reaches isolation barrier. Use Value: Maintains signal integrity and extends optocoupler lifetime by limiting reverse voltage to <91.1V during 5.7A surges. |
| LED Driver Overvoltage Clamp | ESD-Sensitive Sensor Interface |
Use Scenario: Safeguarding constant-current LED drivers in streetlight systems against lightning-induced surges on AC mains input. IC Role / Device Role / Timing Role: Primary clamping element on DC bus after bridge rectifier, upstream of buck controller. Use Value: Limits peak bus voltage to 91.1V, preventing overvoltage shutdown or MOSFET avalanche failure in driver ICs. | Use Scenario: Protecting I²C or analog sensor inputs (e.g., temperature, pressure) in automotive cabin modules from human-body-model ESD. IC Role / Device Role / Timing Role: Low-leakage (≤1μA) standoff protector placed directly at connector entry point before signal conditioning amplifier. Use Value: Ensures <1μA leakage does not perturb mV-level sensor signals while clamping 8kV HBM ESD pulses to safe levels. |
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-214AC package; 51V VWM, 56.7–62.7V VBR, 87.1V VC @ 6.0A - slightly lower clamping voltage but higher IPPM | Preferred for space-constrained PCBs requiring surface-mount; not axial-lead compatible | Select SMAJ51A when migrating to SMT layout or needing tighter VBR tolerance (±5% vs SA51C's ±11%) |
| ON Semiconductor 1.5KE51A | Higher PPK = 1500W, DO-201AD package; 51V VWM, 56.7–62.7V VBR, 87.1V VC - larger footprint, higher surge margin | Suitable for industrial UPS or telecom power where 1.5kW surge headroom is required | Choose 1.5KE51A when system-level surge testing exceeds IEC 61000-4-5 Level 4 and axial DO-15 mechanical fit allows |
Compared with SMAJ51A and 1.5KE51A, the SA51C offers AEC-Q101 qualification in a cost-effective DO-15 package with optimized clamping for 12V/24V automotive subsystems - making it ideal where qualification, axial mounting, and precise 500W surge handling are prioritized over SMT density or ultra-high-power margin.
Availability
SA51C is available at Aetrix Electronics and suitable for automotive power rail protection, industrial PLC input safeguarding, and LED driver overvoltage clamping requiring stable component supply across production lifecycles.
Supply support for SA51C 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 specializing in discrete power devices, TVS diodes, and rectifiers with global distribution and AEC-Q101 validation capabilities.
The SA Series was developed specifically for automotive and industrial transient suppression, emphasizing robust clamping performance, low leakage, and qualification to stringent reliability standards under temperature and surge stress.
FAQ
What is the exact breakdown voltage range for SA51C?
The SA51C has a specified breakdown voltage VBR range of 56.7V to 69.3V at IT = 1mA, measured per ANSI/IEEE C62.35. This range reflects manufacturing tolerance and ensures reliable avalanche initiation across temperature and unit variance - critical for consistent clamping behavior in automotive environments where SA51C is deployed.
Is SA51C unidirectional or bidirectional?
SA51C is a unidirectional TVS diode, as confirmed by its part number suffix "C" (per TSC ordering code SAx format) and explicit specification of forward voltage (VF = 3.5V @ 35A) and cathode band marking. It conducts only in reverse bias during surge events and blocks forward current up to its rated IFSM = 70A - unlike bidirectional variants (e.g., SA51CA) which lack forward voltage specs.
Does SA51C meet AEC-Q101 qualification?
Yes, SA51C is AEC-Q101 qualified, as documented in the SA Series datasheet Version L2105 under FEATURES and ORDERING INFORMATION (where "H" suffix denotes qualification). This certification covers stress tests including HTGB, HTRB, TCT, and surge endurance - confirming SA51C's suitability for automotive powertrain and chassis applications where SA51C is commonly used.
What is the maximum clamping voltage of SA51C under surge conditions?
The maximum clamping voltage VC of SA51C is 91.1V at IPPM = 5.7A for a 10/1000μs waveform, per the MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS table. This value defines the upper voltage limit imposed on protected circuitry during worst-case surge events - a key parameter for verifying SA51C compatibility with downstream IC absolute maximum ratings.
What package type does SA51C use and what are its mechanical highlights?
SA51C uses the DO-204AC (DO-15) axial package with pure tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance. Its molding compound meets UL 94V-0 flammability rating, and typical unit weight is 0.400g - enabling manual or wave-solder assembly in legacy automotive and industrial designs where SA51C is specified.
SA51C 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 91.1V
- Current - Peak Pulse (10/1000µs):
- 5.7A
- 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)
SA51C FAQ
1.How can I place an order for SA51C through Aetrix?
Please submit a Request for Quotation (RFQ) for SA51C 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 SA51C reliable?
The price and inventory of SA51C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA51C is usually 5 days.
3.What payment methods are accepted for SA51C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA51C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA51C?
SA51C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA51C 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 SA51C?
For technical support, including SA51C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA51C requirements.
6.How does Aetrix verify that SA51C is sourced from the original manufacturer or authorized distributors?
All SA51C 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 SA51C meets industry standards.
7.What is the process for return or replacement of SA51C?
All SA51C units undergo pre-shipment inspection (PSI). If there is an issue with SA51C, 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 SA51C part is unused and in its original packaging.
Return procedure for SA51C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA51C Tags
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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