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Vishay General Semiconductor - Diodes Division SA51HE3/54
- Part No.:
- SA51HE3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA51HE3/54.pdf
- Description:
- TVS DIODE 51VWM 91.1VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,170
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Product details
Overview
SA51HE3/54 from Vishay General Semiconductor is a uni-directional Transient Voltage Suppressor (TVS) diode in DO-204AC (DO-15) package, designed for clamping inductive switching transients and ESD events on power and signal lines. It features 51 V stand-off voltage (VWM), 56.7–62.7 V breakdown voltage (VBR) at 1 mA, 500 W peak pulse power (10/1000 μs), 82.4 V maximum clamping voltage at 6.1 A IPPM, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SA51HE3/54 datasheet, SA51HE3/54 pinout, SA51HE3/54 application, or SA51HE3/54 equivalent, this device is selected for robust overvoltage protection in DC power rails, sensor interfaces, and MOSFET gate drivers where fast response (<1 ns), low clamping ratio, and high surge current tolerance (6.1 A) are critical design requirements.
Technical Context
The SA51HE3/54 operates as a uni-directional avalanche diode with glass-passivated junction, enabling stable breakdown behavior under repetitive transient stress. Its 51 V stand-off voltage allows integration into 48 V nominal systems while maintaining margin against normal operating ripple.
It delivers 500 W peak pulse power per 10/1000 μs waveform at TA = 25 °C, with thermal derating above 25 °C per Fig. 2 and junction temperature limit of 175 °C. The device exhibits 5 %/°C breakdown voltage temperature coefficient and 3.0 W steady-state power dissipation on infinite heatsink at TL = 75 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping begins; sets system voltage margin for 48 V rail protection. |
| VBR min/max | 56.7 V / 62.7 V at IT = 1 mA - Confirmed avalanche threshold range; ensures predictable turn-on across production lot and temperature. |
| VC @ IPPM | 82.4 V at 6.1 A - Clamped voltage during 10/1000 μs surge; defines worst-case overvoltage seen by downstream ICs. |
| PPPM | 500 W - Peak transient energy handling capability; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out. |
| ID @ VWM | 1.0 μA - Reverse leakage at rated stand-off; negligible power loss and noise injection in standby operation. |
| TJ max | 175 °C - Maximum junction temperature; enables use in under-hood automotive environments and industrial enclosures. |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with matte tin-plated leads, RoHS-compliant and AEC-Q101 qualified. |
Pinout & Package
DO-204AC (DO-15) package: axial-leaded, molded epoxy case meeting UL 94 V-0 flammability rating; cathode indicated by color band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path); conducts during forward surge or bias conditions. |
| Cathode | Avalanche clamping terminal | Marked with color band; connected to protected line (e.g., 48 V rail); initiates clamping when reverse voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated chip junction | Ensures stable, repeatable avalanche characteristics and long-term reliability under thermal cycling and humidity stress. |
| 500 W peak pulse power (10/1000 μs) | Supports high-energy transients without degradation; validated per JEDEC standards with 0.01 % duty cycle. |
| AEC-Q101 qualification | Validated for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. |
| Low incremental clamping resistance | Enables tight VC–VBR spread (25.7 V), minimizing overvoltage overshoot during fast-rising transients. |
| Matte tin-plated leads | Guarantees solderability per J-STD-002 and JESD 22-B102; HE3 suffix meets JESD 201 Class 2 whisker resistance. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 48 V battery-fed ECUs from load dump and alternator surge events. IC Role / Device Role / Timing Role: Uni-directional TVS placed between power rail and chassis ground to clamp transients before they reach PMICs or microcontrollers. Use Value: With 51 V VWM and 82.4 V VC, it limits overvoltage to within safe operating area of 100 V-rated input capacitors and LDOs. |
Use Scenario: Shielding analog output lines of pressure/temperature sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance (typ. <100 pF) TVS mounted at connector entry point to shunt fast transients before reaching ADC front-end. Use Value: Sub-1 ns response time and 1.0 μA leakage preserve signal integrity and measurement accuracy in precision 24-bit sensor systems. |
| MOSFET Gate Driver Protection | Telecom DC Power Input Stage |
|
Use Scenario: Safeguarding high-side N-channel MOSFET gate drivers in motor control inverters from Miller-induced voltage spikes. IC Role / Device Role / Timing Role: TVS connected between gate and source to clamp dv/dt-induced overshoot during switching transitions. Use Value: 6.1 A IPPM rating handles repetitive gate ringing energy; 56.7–62.7 V VBR aligns with 60 V gate oxide limits. |
Use Scenario: Front-end protection for -48 V telecom rectifier outputs exposed to lightning-induced surges on distribution lines. IC Role / Device Role / Timing Role: Primary uni-directional clamping device on DC input before DC/DC converters and hot-swap controllers. Use Value: 500 W PPPM and 175 °C TJ max ensure survivability in unventilated central office cabinets with ambient up to 85 °C. |
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-E3/54 | Same DO-214AC (SMA) package, identical VWM/VBR/VC specs, but lower 400 W PPPM rating and non-AEC-Q101 grade. | Preferred for cost-sensitive commercial power supplies where automotive qualification is unnecessary. | Select SMAJ51A-E3/54 only if board space allows SMA footprint and AEC-Q101 compliance is not required. |
| 1.5KE51A | Higher 1500 W PPPM, DO-201AD package, 51 V VWM, but larger size, higher VF, and no AEC-Q101 qualification. | Suitable for high-energy industrial AC/DC front-ends where PCB real estate permits larger axial packages. | Choose 1.5KE51A when surge energy exceeds 500 W and layout accommodates longer leads and higher inductance. |
Compared with SMAJ51A-E3/54 and 1.5KE51A, the SA51HE3/54 uniquely combines AEC-Q101 qualification, DO-15 form factor, and 500 W surge rating-making it the only option qualified for automotive under-hood placement without footprint or reliability compromise.
Availability
SA51HE3/54 is available at Aetrix Electronics and suitable for automotive power management, industrial sensor interface, and telecom DC input protection requiring stable component supply, traceable sourcing, and long-term lifecycle support.
Supply support for SA51HE3/54 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SA51HE3/54 belongs to Vishay's TRANSZORB® TVS family, engineered for high-reliability transient suppression in harsh environments-including automotive, industrial automation, and communications infrastructure.
FAQ
What is the clamping voltage of the SA51HE3/54 under a 10/1000 μs surge?
The SA51HE3/54 has a maximum clamping voltage (VC) of 82.4 V at 6.1 A peak pulse current (IPPM) for a 10/1000 μs waveform. This value is measured per Figure 7 in the datasheet and defines the upper voltage limit imposed on protected circuitry during standardized surge events. The SA51HE3/54 maintains this clamping performance across its specified operating temperature range.
Is the SA51HE3/54 suitable for automotive applications?
Yes, the SA51HE3/54 is AEC-Q101 qualified and explicitly rated for automotive use. Its DO-204AC package, 175 °C maximum junction temperature, and robust surge handling make it appropriate for engine control modules, body control units, and ADAS sensor power rails. The HE3 suffix confirms compliance with JESD 201 Class 2 whisker resistance and automotive reliability testing.
How does the SA51HE3/54 differ from bi-directional variants like SA51CA?
The SA51HE3/54 is uni-directional, meaning it conducts only in reverse breakdown and blocks forward current beyond ~3.5 V VF. In contrast, SA51CA is bi-directional with symmetrical clamping in both polarities-used where AC signals or bidirectional data lines require protection. The SA51HE3/54's uni-directional nature provides tighter leakage control (1.0 μA vs. up to 5.0 μA for CA types) and avoids forward conduction in DC-coupled rails.
What is the thermal derating behavior of the SA51HE3/54 above 25 °C?
The SA51HE3/54 follows linear derating above TA = 25 °C: peak pulse power decreases per Figure 2, and steady-state power dissipation drops from 3.0 W at TL = 75 °C to zero at TL = 175 °C. For example, at 100 °C ambient, its PPPM is reduced to ~75 % of rated 500 W. Designers must apply these curves when sizing heatsinking or estimating lifetime in high-temperature enclosures.
Can the SA51HE3/54 be used in parallel for higher surge current handling?
No-parallel connection of SA51HE3/54 devices is not recommended due to mismatched VBR tolerances (±5 %) causing current imbalance and premature failure of the lower-VBR unit. For higher IPPM, select a single higher-rated device such as SA64HE3/54 (IPPM = 4.9 A) or use a TVS array with matched characteristics. The SA51HE3/54 is characterized and qualified as a standalone component.
SA51HE3/54 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 5.5A
- 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)
SA51HE3/54 FAQ
1.How can I place an order for SA51HE3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA51HE3/54 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 SA51HE3/54 reliable?
The price and inventory of SA51HE3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA51HE3/54 is usually 5 days.
3.What payment methods are accepted for SA51HE3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA51HE3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA51HE3/54?
SA51HE3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA51HE3/54 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 SA51HE3/54?
For technical support, including SA51HE3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA51HE3/54 requirements.
6.How does Aetrix verify that SA51HE3/54 is sourced from the original manufacturer or authorized distributors?
All SA51HE3/54 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 SA51HE3/54 meets industry standards.
7.What is the process for return or replacement of SA51HE3/54?
All SA51HE3/54 units undergo pre-shipment inspection (PSI). If there is an issue with SA51HE3/54, 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 SA51HE3/54 part is unused and in its original packaging.
Return procedure for SA51HE3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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