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Vishay General Semiconductor - Diodes Division SA51HE3/73
- Part No.:
- SA51HE3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA51HE3/73.pdf
- Description:
- TVS DIODE 51VWM 91.1VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,227
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Product details
Overview
SA51HE3/73 from Vishay General Semiconductor is a uni-directional TransZORB® transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, rated for 51 V stand-off voltage (VWM), 62.7 V minimum breakdown voltage (VBR), and 500 W peak pulse power (10/1000 μs). It delivers 6.1 A peak pulse current (IPPM) with 82.4 V maximum clamping voltage (VC) and is AEC-Q101 qualified for automotive electronics protection.
For engineers reviewing the SA51HE3/73 datasheet, SA51HE3/73 pinout, SA51HE3/73 application, or SA51HE3/73 equivalent, this part is selected for robust overvoltage protection on DC power rails, sensor interfaces, and MOSFET gate drivers where fast response (<1 ns), low clamping ratio, and high surge reliability under repetitive transients are required.
Technical Context
The SA51HE3/73 employs a glass-passivated silicon junction optimized for bi-polar surge suppression in uni-directional configuration, with polarity indicated by a cathode band. Its clamping behavior follows a well-defined incremental resistance curve up to 6.1 A, maintaining stable VC ≤ 82.4 V under standardized 10/1000 μs pulses.
Thermal performance is characterized by a 175 °C maximum junction temperature and 3.0 W steady-state power dissipation at TL = 75 °C, supported by matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards. The HE3 suffix confirms AEC-Q101 qualification and JESD 201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 48 V systems. |
| VBR (min) | 56.7 V - Minimum breakdown voltage at 1.0 mA test current; ensures reliable turn-on above nominal system voltage. |
| VC @ IPPM | 82.4 V - Maximum clamped voltage at 6.1 A peak pulse; limits protected circuit stress during 10/1000 μs transients. |
| PPPM | 500 W - Peak pulse power handling per 10/1000 μs waveform; supports IEC 61000-4-5 Level 4 surge immunity. |
| IPPM | 6.1 A - Peak pulse current derived from PPPM/VC; enables precise coordination with upstream fuses or current limiters. |
| TJ max | 175 °C - Maximum junction temperature; allows operation in under-hood automotive environments without derating. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per AEC standard. |
Pinout & Package
Package: DO-204AC (DO-15), axial-leaded, molded epoxy case meeting UL 94 V-0 flammability rating. Cathode indicated by color band on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected line (e.g., ground or return path); conducts during forward surge events. |
| Cathode | Reverse-biased clamping terminal | Connected to higher-potential side (e.g., +VIN or signal line); initiates avalanche clamping when VAK exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enables stable, repeatable avalanche characteristics over 1000+ surge cycles without parameter drift. |
| 500 W peak pulse power (10/1000 μs) | Supports industrial-level surge immunity (IEC 61000-4-5) without external heat sinking. |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, body control, and ADAS modules requiring zero-failure field reliability. |
| Low incremental clamping resistance | Ensures minimal voltage overshoot during fast-rising transients (e.g., inductive switch-off in solenoid drivers). |
| Matte tin plating & JESD 201 Class 2 whisker resistance | Guarantees long-term solder joint integrity in high-reliability assemblies exposed to thermal cycling. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 48 V battery-fed ECUs against load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Uni-directional TVS placed between battery rail and input filter capacitor to clamp surges above 51 V. Use Value: Limits peak voltage to ≤82.4 V during 6.1 A transients, preventing damage to downstream DC/DC controllers and microcontrollers. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted at connector entry point to shunt fast transients before reaching op-amp inputs. Use Value: Sub-1 ns response time and 82.4 V clamping prevent latch-up or parametric shift in precision front-end circuits. |
| MOSFET Gate Driver Protection | Telecom DC Power Input Protection |
Use Scenario: Safeguarding high-side N-channel MOSFET gates driven by isolated PWM signals in motor inverters. IC Role / Device Role / Timing Role: TVS connected between gate and source to suppress Miller-induced voltage spikes during switching transitions. Use Value: 56.7–62.7 V VBR range aligns with common 60 V gate drive rails, ensuring clamping before gate oxide breakdown. |
Use Scenario: Hardening -48 V telecom rectifier outputs against lightning-induced surges on distribution lines. IC Role / Device Role / Timing Role: Primary TVS on secondary side of isolation transformer, coordinated with MOVs on primary side. Use Value: 500 W rating and 82.4 V clamping enable compliance with GR-1089-CORE Level 3 surge requirements. |
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-E3/5A | Same VWM (51 V), identical DO-214AC package, but lower PPPM (400 W) and higher VC (87.1 V). | Less suitable for IEC 61000-4-5 Level 4; better for space-constrained PCBs where SMA footprint is preferred. | Select SMAJ51A-E3/5A only if board area is critical and surge energy is limited to ≤400 W. |
| 1.5KE51A | Higher PPPM (1500 W), larger DO-201AD package, same VWM/VBR range, but no AEC-Q101 qualification. | Used in non-automotive industrial power supplies where mechanical robustness outweighs qualification needs. | Choose 1.5KE51A for higher-energy surges where AEC-Q101 is not mandated and board space permits larger case. |
Compared with SMAJ51A-E3/5A and 1.5KE51A, the SA51HE3/73 uniquely combines AEC-Q101 qualification, DO-15 form factor, and 500 W capability-making it the preferred choice for automotive and high-reliability embedded systems requiring validated field performance.
Availability
SA51HE3/73 is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface hardening, and telecom power input protection requiring stable component supply across multi-year production cycles.
Supply support for SA51HE3/73 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, TVS devices, and optoelectronics with emphasis on reliability and application-specific performance.
The SA51HE3/73 belongs to Vishay's TransZORB® family of transient voltage suppressors, engineered specifically for high-surge, high-reliability protection in automotive, industrial, and communications infrastructure applications.
FAQ
What is the clamping voltage of the SA51HE3/73 at its rated peak pulse current?
The SA51HE3/73 has a maximum clamping voltage (VC) of 82.4 V at its rated peak pulse current (IPPM) of 6.1 A, measured under the standardized 10/1000 μs waveform. This value is guaranteed across the full operating temperature range and ensures predictable overvoltage limiting for protected circuits. The SA51HE3/73 maintains this clamping performance due to its glass-passivated junction and low incremental surge resistance.
Is the SA51HE3/73 suitable for automotive applications?
Yes, the SA51HE3/73 is AEC-Q101 qualified and explicitly rated for automotive use, with testing covering temperature cycling, high-temperature reverse bias, and ESD. Its DO-204AC package, matte tin plating, and JESD 201 Class 2 whisker resistance further validate its suitability for under-hood and chassis-mounted modules. The SA51HE3/73 meets the reliability demands of modern automotive electronics where field failure is unacceptable.
How does the SA51HE3/73 differ from bi-directional variants like SA51CA?
The SA51HE3/73 is a uni-directional TVS diode with cathode marking and forward conduction capability, whereas SA51CA is bi-directional and unmarked. The SA51HE3/73 provides asymmetric protection-clamping only in reverse and conducting forward-making it ideal for DC power rails and polarized signal paths. In contrast, SA51CA protects AC or bidirectional data lines but lacks forward conduction. Their VBR and VC values also differ slightly per datasheet specifications.
What is the maximum operating temperature for the SA51HE3/73?
The SA51HE3/73 has a maximum junction temperature (TJ) of 175 °C, enabling reliable operation in high-ambient environments such as engine compartments or enclosed industrial enclosures. Its thermal derating curve (Fig. 2) shows linear power reduction above 25 °C ambient, and the device sustains full 500 W pulse capability up to TJ = 125 °C. This specification is integral to the SA51HE3/73's qualification for demanding automotive and industrial deployments.
Does the SA51HE3/73 meet RoHS and halogen-free requirements?
Yes, the SA51HE3/73 carries the HE3 suffix, indicating RoHS-compliant construction per Directive 2011/65/EU and halogen-free status per JEDEC JS709A. The molding compound meets UL 94 V-0 flammability rating, and the matte tin-plated leads comply with J-STD-002 solderability standards. These material attributes are verified and documented in Vishay's official compliance reports for the SA51HE3/73.
SA51HE3/73 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Box (TB)
- 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)
SA51HE3/73 FAQ
1.How can I place an order for SA51HE3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA51HE3/73 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 SA51HE3/73 reliable?
The price and inventory of SA51HE3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA51HE3/73 is usually 5 days.
3.What payment methods are accepted for SA51HE3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA51HE3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA51HE3/73?
SA51HE3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA51HE3/73 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 SA51HE3/73?
For technical support, including SA51HE3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA51HE3/73 requirements.
6.How does Aetrix verify that SA51HE3/73 is sourced from the original manufacturer or authorized distributors?
All SA51HE3/73 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 SA51HE3/73 meets industry standards.
7.What is the process for return or replacement of SA51HE3/73?
All SA51HE3/73 units undergo pre-shipment inspection (PSI). If there is an issue with SA51HE3/73, 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 SA51HE3/73 part is unused and in its original packaging.
Return procedure for SA51HE3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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