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Taiwan Semiconductor Corporation SA51CH
- Part No.:
- SA51CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA51CH.pdf
- Description:
- 500W, 63V, BIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:7,785
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Product details
Overview
SA51CH from Taiwan Semiconductor is a unidirectional 500W transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, with 51V working stand-off voltage (VWM), 56.7–69.3V breakdown voltage (VBR @ 1mA), and 91.1V maximum clamping voltage (VC) at 5.7A peak pulse current. It delivers AEC-Q101 qualification for automotive-grade surge protection in power supply rails and signal lines.
For engineers reviewing the SA51CH datasheet, SA51CH pinout, SA51CH application, or SA51CH equivalent, this page provides verified electrical parameters, clamping performance under 10/1000μs transients, thermal derating behavior, polarity marking, and direct alternatives for ESD and inductive switching protection in harsh environments.
Technical Context
The SA51CH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (56.7–69.3V), clamping transients to ≤91.1V at 5.7A. Its low dynamic impedance ensures effective suppression of fast-rising EFT and lightning-induced surges.
Designed for automotive compliance, it features AEC-Q101 qualification, 175°C maximum junction temperature, and meets JESD201 Class 2 whisker resistance. The device uses pure tin-plated leads and UL 94V-0 molding compound for reliability in high-vibration, high-temperature PCB assemblies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR min/max | 56.7 / 69.3 V @ 1 mA - Confirmed breakdown threshold range defining turn-on consistency |
| VC @ IPPM | 91.1 V @ 5.7 A - Clamped voltage during 10/1000μs surge, limiting downstream IC stress |
| PPK | 500 W - Peak pulse power handling per single non-repetitive 10/1000μs waveform |
| IR @ VWM | <1 μA - Negligible leakage at rated stand-off, preserving low-power circuit integrity |
| TJ max | 175 °C - Enables operation in under-hood automotive environments without thermal shutdown |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with cathode band marking |
Pinout & Package
DO-204AC (DO-15) package with axial leads: anode (unmarked end) and cathode (banded end). Polarity is marked via molded cathode band; no internal pin numbering applies as it is a two-terminal discrete diode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference node | Connected to lower-potential side (e.g., GND or return path) in unidirectional TVS configuration |
| Cathode | Clamping output / Surge current sink | Connected to protected line (e.g., 51V rail); conducts surge current to ground when Vline > VBR |
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 transients |
| Fast response time <1.0 ps | Activates before sensitive logic or analog circuits experience overvoltage damage |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and automotive ELV directive requirements |
| UL 94V-0 molding compound | Prevents flame propagation in high-energy fault conditions on PCB |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 5V–48V microcontroller power inputs against load dump and alternator ripple in vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between rail and chassis ground to clamp transients above 51V. Use Value: Limits voltage excursion to ≤91.1V during 500W surges, preventing MCU latch-up or regulator failure. | Use Scenario: Safeguarding RS-485 transceiver I/O pins from ESD and inductive kickback in factory automation PLCs. IC Role / Device Role / Timing Role: Bidirectional-capable variant not used; SA51CH applied on VCC line only due to unidirectional architecture. Use Value: Sub-1μA leakage preserves sensor bias accuracy while enabling 5.7A surge current sinking capability. |
| LED Driver Overvoltage Clamp | DC-DC Converter Input Stage Protection |
Use Scenario: Clamping input voltage spikes on constant-current LED drivers powered from 48V bus in street lighting systems. IC Role / Device Role / Timing Role: Connected anode-to-ground, cathode-to-input rail to shunt overvoltage events. Use Value: 91.1V clamping voltage ensures driver IC remains within absolute maximum ratings during 10/1000μs transients. | Use Scenario: Front-end protection for buck converter ICs subjected to 12V–24V automotive input with load dump risk. IC Role / Device Role / Timing Role: Placed upstream of input capacitor to absorb energy before reaching controller and MOSFETs. Use Value: 500W peak power rating handles ISO 7637-2 Pulse 5a (load dump) without degradation over 1000+ events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51A | Same DO-214AC package; 51V VWM, 56.7–62.7V VBR, 87.1V VC @ 6.0A; RoHS, not AEC-Q101 qualified | Lacks automotive qualification; suitable for industrial/commercial use only | Select SMAJ51A where AEC-Q101 is not required and board space allows SMD mounting |
| P6KE51A | DO-204AC package; 51V VWM, 56.7–62.7V VBR, 87.1V VC @ 6.0A; 600W PPK; not AEC-Q101 qualified | Higher peak power but no automotive qualification; larger thermal mass than SA51CH | Choose P6KE51A when higher surge margin is needed and qualification is secondary |
Compared with SMAJ51A and P6KE51A, the SA51CH uniquely combines AEC-Q101 qualification, DO-204AC axial form factor, and 500W 10/1000μs rating-making it the preferred choice for automotive OEM designs requiring traceable, qualified components without layout change.
Availability
SA51CH is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor interface hardening, and LED driver overvoltage clamping requiring stable component supply across multi-year production cycles.
Supply support for SA51CH 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, rectifiers, and MOSFETs for automotive, industrial, and consumer markets.
The SA Series TVS diodes are engineered specifically for robust transient immunity in automotive power systems, emphasizing AEC-Q101 compliance, tight VBR tolerance, and repeatable clamping performance under thermal stress.
FAQ
What is the clamping voltage of SA51CH under standard 10/1000μs surge conditions?
The SA51CH has a maximum clamping voltage (VC) of 91.1 V at 5.7 A peak pulse current under the 10/1000μs waveform. This value is measured per IEC 61000-4-5 and defines the upper voltage limit imposed on protected circuitry during surge events. The SA51CH maintains this clamping performance across its full operating temperature range up to 175°C junction temperature.
Is SA51CH suitable for bidirectional transient protection?
No, SA51CH is a unidirectional TVS diode intended for DC rail protection where polarity is fixed. Its datasheet specifies breakdown and clamping only in reverse bias; forward conduction follows standard silicon diode behavior. For bidirectional protection, SA51CH must be paired with another diode or replaced with a bipolar variant such as SA51A. The SA51CH itself does not support symmetrical clamping in both directions.
Does SA51CH meet automotive qualification standards?
Yes, SA51CH is explicitly AEC-Q101 qualified, as confirmed in the "FEATURES" section of the official Taiwan Semiconductor SA Series datasheet (Version L2105). This qualification covers stress tests including high-temperature operating life, temperature cycling, and mechanical shock-validating its suitability for under-hood and body-control module applications in passenger vehicles and commercial fleets.
What is the maximum junction temperature rating for SA51CH?
The SA51CH has a maximum junction temperature (TJ MAX) rating of +175°C, enabling reliable operation in high-ambient environments such as engine compartments or enclosed industrial enclosures. Derating curves in the datasheet confirm usable surge capability down to 0% at 175°C ambient, with linear reduction from 100% at 25°C. This TJ MAX supports long-term reliability in thermally demanding SA51CH deployments.
How is polarity marked on the SA51CH DO-204AC package?
The SA51CH uses a molded cathode band on the DO-204AC (DO-15) package to indicate polarity: the banded end is the cathode, and the unmarked end is the anode. This marking aligns with JEDEC standards and is visible under standard visual inspection. When mounted, the cathode connects to the line being protected (e.g., 51V rail), and the anode connects to ground or the lower-potential reference node.
SA51CH 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:
- -
- 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)
SA51CH FAQ
1.How can I place an order for SA51CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA51CH 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 SA51CH reliable?
The price and inventory of SA51CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA51CH is usually 5 days.
3.What payment methods are accepted for SA51CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA51CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA51CH?
SA51CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA51CH 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 SA51CH?
For technical support, including SA51CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA51CH requirements.
6.How does Aetrix verify that SA51CH is sourced from the original manufacturer or authorized distributors?
All SA51CH 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 SA51CH meets industry standards.
7.What is the process for return or replacement of SA51CH?
All SA51CH units undergo pre-shipment inspection (PSI). If there is an issue with SA51CH, 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 SA51CH part is unused and in its original packaging.
Return procedure for SA51CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA51CH Tags
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