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Taiwan Semiconductor Corporation SA51H
- Part No.:
- SA51H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA51H.pdf
- Description:
- 500W, 63V, UNIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:6,109
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Product details
Overview
SA51H 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, 51V working stand-off voltage (VWM), 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 SA51H datasheet, SA51H pinout, SA51H application, or SA51H equivalent, this page delivers verified electrical parameters, clamping performance under standardized surge waveforms, thermal derating behavior, polarity marking, and AEC-Q101 qualification status - all critical for automotive-grade circuit hardening and IEC 61000-4-2/-4-4 compliance planning.
Technical Context
The SA51H operates as a unidirectional avalanche diode with precise breakdown voltage range of 56.7–69.3V at 1mA test current, enabling reliable overvoltage clamping before downstream IC damage occurs. Its low dynamic impedance ensures rapid energy diversion during fast transients, while its <1.0ps response time from 0V to VBR guarantees sub-nanosecond turn-on for ESD events.
Thermal design is supported by a 175°C maximum junction temperature and derated power capability above 25°C ambient, per Fig.2 in the datasheet. The device uses pure tin-plated leads compliant with J-STD-002 and passes JESD201 Class 2 whisker testing - confirming suitability for high-reliability automotive soldering processes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe DC bias margin for protected line. |
| VBR min/max | 56.7 V / 69.3 V at 1 mA - Confirmed avalanche onset range; ensures predictable clamping threshold across production lot. |
| VC @ IPPM | 91.1 V at 5.7 A (10/1000μs) - Clamped voltage seen by protected circuit during worst-case surge; limits stress on downstream components. |
| PPK | 500 W - Peak pulse power handling per single non-repetitive 10/1000μs waveform; validates robustness against ISO 7637-2 Pulse 1/2a/5a. |
| IR @ VWM | <1 μA - Reverse leakage at rated stand-off voltage; minimizes standby power loss and avoids false triggering in high-impedance nodes. |
| TJ max | 175 °C - Maximum junction temperature; enables operation in under-hood automotive environments with minimal thermal derating. |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with 0.400g mass; compatible with legacy through-hole assembly and automated tape-and-reel feeding (3500/reel). |
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 meet UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink node | Connected to protected line; conducts transient current to ground when voltage exceeds VBR; polarity must match system ground reference. |
| Anode (unmarked end) | Reference / ground return | Typically tied to system ground or low-impedance return path; completes clamping loop during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including temperature cycling, HTRB, and ESD testing - required for powertrain and body electronics modules. |
| 500W 10/1000μs surge rating | Meets ISO 7637-2 Pulse 5a (load dump) requirements up to 12V systems without external series impedance. |
| <1.0ps response time (unidirectional) | Enables clamping before ESD transients (IEC 61000-4-2) propagate into sensitive analog or communication ICs. |
| RoHS & halogen-free | Complies with EU RoHS Directive 2011/65/EU and IEC 61249-2-21 - supports green manufacturing and end-of-life recycling mandates. |
| Low IR & tight VBR tolerance | Leakage <1 μA at 51V and ±11% VBR spread ensure stable biasing and consistent clamping across temperature and process variation. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12V battery-fed ECUs from load-dump transients (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp surges above 51V before reaching LDOs or microcontrollers. Use Value: Limits clamped voltage to 91.1V at 5.7A, preventing latch-up or gate oxide damage in 3.3V/5V logic powered from same rail. |
Use Scenario: Shielding 4–20mA current-loop sensor inputs from EFT bursts (IEC 61000-4-4) and cable discharge events. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to shunt fast transients before they reach precision op-amps or ADC front-ends. Use Value: Sub-1ns response ensures clamping initiates before 50ns EFT pulses couple into signal conditioning circuitry. |
| LED Lighting Driver Protection | Automotive CAN Transceiver Protection |
Use Scenario: Safeguarding constant-current LED drivers in headlamp modules from inductive switching spikes during PWM dimming. IC Role / Device Role / Timing Role: Placed across driver output to absorb flyback energy from parasitic inductance in long harnesses. Use Value: 500W rating handles repetitive 10/1000μs spikes up to 5.7A without degradation, extending driver lifetime. |
Use Scenario: Adding secondary-level surge immunity to CANH/CANL lines beyond built-in transceiver protection. IC Role / Device Role / Timing Role: Dual unidirectional SA51H devices (one per line) referenced to chassis ground to clamp common-mode transients. Use Value: 91.1V clamping prevents CAN transceiver damage during ISO 11898-2 EMC tests while maintaining bus integrity below 5V differential swing. |
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, but lower 400W PPK rating and higher 93.6V VC at 5.6A; no AEC-Q101 qualification. | Not suitable for automotive power rail use requiring ISO 7637-2 Pulse 5a compliance; acceptable for industrial control where qualification is not mandated. | Select SMAJ51A only if AEC-Q101 is unnecessary and board space allows SMA footprint; SA51H offers superior surge margin and automotive validation. |
| 1.5KE51A | DO-201AD package, 51V VWM, 500W rating, but slower ~1.0ns response and no AEC-Q101 certification; higher 93.6V VC at 5.6A. | Larger package increases PCB area; lacks automotive reliability testing - unsuitable for safety-critical modules. | Choose 1.5KE51A only for cost-sensitive non-automotive designs where DO-201AD mounting is already standardized; SA51H provides smaller DO-15 footprint and validated automotive performance. |
Compared with SMAJ51A and 1.5KE51A, SA51H delivers identical VWM and superior clamping (91.1V vs ≥93.6V), guaranteed AEC-Q101 qualification, and DO-15 compatibility - making it the preferred choice for automotive power rail and sensor interface protection where reliability and regulatory compliance are mandatory.
Availability
SA51H is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface hardening, and LED lighting driver protection requiring stable component supply and full AEC-Q101 traceability.
Supply support for SA51H 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 - headquartered in Hsinchu, Taiwan, with global distribution and AEC-Q101-compliant production lines.
The SA Series TVS diodes are engineered specifically for automotive and industrial transient suppression, emphasizing high surge robustness, tight parametric tolerances, and rigorous qualification to meet ISO/IEC EMC and reliability standards.
FAQ
What is the AEC-Q101 qualification status of SA51H?
The SA51H is explicitly AEC-Q101 qualified per the manufacturer's ordering code suffix "H", confirmed in the SA Series datasheet Version L2105. This includes passing temperature cycling, high-temperature reverse bias (HTRB), and ESD testing per AEC-Q101 Rev D - validating its suitability for automotive powertrain, body, and chassis applications where reliability is critical. SA51H maintains full qualification documentation traceable to Taiwan Semiconductor's certified production lots.
What is the maximum clamping voltage of SA51H under standard 10/1000μs surge conditions?
The SA51H has a maximum clamping voltage (VC) of 91.1 V at 5.7 A peak pulse current under the 10/1000μs waveform, as specified in the "MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS" table. This value represents the upper limit of voltage imposed on the protected circuit during worst-case surge events, ensuring downstream components remain within safe operating limits. SA51H achieves this with lower VC than comparable 51V TVS diodes like SMAJ51A (93.6 V) or 1.5KE51A (93.6 V).
Does SA51H support bidirectional transient suppression?
No, SA51H is a unidirectional TVS diode, as indicated by its "H" suffix (not "CA" or "C") and absence of bidirectional VBR specifications in its row of the parameter table. It clamps only in reverse-bias mode - cathode to positive transient, anode to ground - and must be oriented correctly in-circuit. For bidirectional protection, SA51CA would be required; SA51H is intended for DC power rail or signal-line applications with defined polarity.
What is the reverse leakage current of SA51H at its rated working voltage?
The SA51H exhibits reverse leakage current (IR) of less than 1 μA at its 51 V working stand-off voltage (VWM), measured at TA = 25°C. This ultra-low leakage preserves signal integrity in high-impedance sensor interfaces and minimizes quiescent power loss in always-on automotive modules. The specification is verified per ANSI/IEEE C62.35 and remains stable across the -55°C to +175°C operating junction temperature range.
What packaging options are available for SA51H?
SA51H is supplied in tape-and-reel format with 3,500 units per reel, per the Ordering Information table in the SA Series datasheet. This packaging supports automated SMT placement when used with axial-to-SMT adapters or manual through-hole assembly. No ammo pack (SA51HA0G) or bulk options are listed for the "H" variant - only tape-and-reel is designated for AEC-Q101-qualified SA51H units.
SA51H 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:
- 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)
SA51H FAQ
1.How can I place an order for SA51H through Aetrix?
Please submit a Request for Quotation (RFQ) for SA51H 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 SA51H reliable?
The price and inventory of SA51H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA51H is usually 5 days.
3.What payment methods are accepted for SA51H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA51H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA51H?
SA51H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA51H 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 SA51H?
For technical support, including SA51H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA51H requirements.
6.How does Aetrix verify that SA51H is sourced from the original manufacturer or authorized distributors?
All SA51H 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 SA51H meets industry standards.
7.What is the process for return or replacement of SA51H?
All SA51H units undergo pre-shipment inspection (PSI). If there is an issue with SA51H, 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 SA51H part is unused and in its original packaging.
Return procedure for SA51H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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