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Vishay General Semiconductor - Diodes Division SA51AHE3/54
- Part No.:
- SA51AHE3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA51AHE3/54.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,581
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Product details
Overview
SA51AHE3/54 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode in DO-15 package, designed for circuit protection against ESD and voltage transients. It features 51 V stand-off voltage (VWM), 56.7–62.7 V breakdown voltage (VBR) at 1 mA, 82.4 V clamping voltage at 6.1 A peak pulse current, 500 W peak pulse power (10/1000 µs), and AEC-Q101 qualification for automotive use.
For engineers reviewing the SA51AHE3/54 datasheet, SA51AHE3/54 pinout, SA51AHE3/54 application, or SA51AHE3/54 equivalent, key selection criteria include clamping performance under 10/1000 µs surge, thermal derating above 25 °C, unidirectional polarity marking, DO-15 mechanical compatibility, and compliance with JESD22-B106 soldering and JESD201 Class 2 whisker resistance.
Technical Context
The SA51AHE3/54 operates as a silicon avalanche diode, leveraging glass-passivated junction technology to achieve fast response (<1 ns) and low incremental surge resistance. Its unidirectional configuration uses a cathode band for polarity identification and delivers stable clamping across -55 °C to +175 °C junction temperature range.
It is rated for 70 A non-repetitive forward surge current (IFSM, 10 ms half-sine), 3.0 W steady-state power dissipation at TL = 75 °C, and exhibits a +61 mV/°C breakdown voltage temperature coefficient - enabling predictable voltage shift under thermal stress in automotive engine control units.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 56.7 V / 62.7 V at 1 mA - ensures reliable avalanche initiation within defined tolerance band |
| VC @ IPPM | 82.4 V at 6.1 A - limits transient-induced voltage stress on downstream ICs during 10/1000 µs surge |
| PPPM | 500 W - sustains high-energy transients without failure per IEC 61000-4-5 waveform |
| TJ max | +175 °C - supports under-hood automotive placement with minimal derating |
| IFSM | 70 A - withstands inrush surges from relay coil de-energization or motor commutation |
| Leakage ID | 1.0 µA at VWM - negligible standby power loss in battery-powered sensor nodes |
Pinout & Package
Package: DO-15 (DO-204AC), axial-leaded, epoxy-molded, RoHS-compliant, AEC-Q101 qualified. Matte tin-plated leads meet J-STD-002 solderability and JESD22-B102 wetting requirements. Cathode identified by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional clamp configuration |
| Cathode | Avalanche clamping terminal | Marked with band; connected to protected line (e.g., CAN_H, LIN, or 12 V rail) to shunt overvoltage to ground |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enables stable avalanche characteristics and long-term reliability under repeated surge stress |
| 500 W peak pulse power (10/1000 µs) | Meets ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 Level 3 immunity requirements |
| AEC-Q101 qualification | Validated for automotive powertrain and body electronics applications per stress test conditions |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes voltage overshoot during fast transients, protecting 5 V and 3.3 V logic interfaces |
| JESD201 Class 2 whisker resistance | Prevents tin whisker growth in high-humidity, high-temperature environments over 15+ year service life |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply rails in engine control modules from load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery feed and LDO input to clamp transients up to ±100 V. Use Value: Limits clamped voltage to 82.4 V, preventing damage to 65 V-rated input capacitors and linear regulators. | Use Scenario: Safeguarding analog outputs of pressure or temperature sensors exposed to ESD in factory automation systems. IC Role / Device Role / Timing Role: Standoff protection on 4–20 mA current loop output lines, mounted adjacent to connector. Use Value: Sub-1 ns response ensures clamping occurs before ESD pulse couples into precision op-amp front-end stages. |
| Telecom DC Power Input | Consumer Appliance Motor Control |
Use Scenario: Securing primary-side DC input of PoE-powered network switches against lightning-induced surges. IC Role / Device Role / Timing Role: First-stage transient suppressor upstream of DC-DC converter, rated for 500 W repetitive surge capability. Use Value: 51 V VWM aligns with 48 V nominal telecom rail; 82.4 V VC prevents overvoltage stress on MOSFET gate drivers. | Use Scenario: Clamping back-EMF spikes from brushed DC motors in washing machine control boards. IC Role / Device Role / Timing Role: Mounted across motor terminals to divert inductive kickback energy during PWM commutation. Use Value: 70 A IFSM rating handles 10 ms half-sine surges from motor stall events without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51A-E3/5A | Same VWM (51 V), but SMA package (surface-mount); lower PPPM (400 W); no AEC-Q101 qualification | Preferred for space-constrained PCBs where reflow compatibility is required over through-hole assembly | Select when board real estate is limited and automotive qualification is not mandatory |
| 1.5KE51A | Higher PPPM (1500 W), DO-201 package (larger footprint), higher VF (3.5 V), same VWM/VBR range | Better suited for high-energy industrial surge environments (e.g., AC mains input) where 10/1000 µs energy exceeds 500 W | Choose for legacy designs requiring higher surge margin and larger thermal mass |
Compared with SMAJ51A-E3/5A and 1.5KE51A, the SA51AHE3/54 offers optimal balance of AEC-Q101 compliance, DO-15 mechanical robustness, and precise 51 V standoff for automotive 12 V systems - making it the preferred choice where qualification, leaded reliability, and standardized through-hole assembly are required.
Availability
SA51AHE3/54 is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, and telecom DC input circuits requiring stable component supply with full traceability and long-lifecycle support.
Supply support for SA51AHE3/54 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, and protection devices with emphasis on reliability, ruggedness, and automotive-grade qualification.
The SAxxA series is engineered specifically for transient overvoltage protection in harsh environments - targeting automotive, industrial, and telecom applications where robustness against ESD, load dump, and lightning-induced surges is critical.
FAQ
What is the clamping voltage of SA51AHE3/54 and how is it measured?
The SA51AHE3/54 has a maximum clamping voltage (VC) of 82.4 V, measured at 6.1 A peak pulse current using a 10/1000 µs waveform per IEC 61000-4-5. This value reflects the actual voltage seen by protected circuitry during surge events and is guaranteed across the full operating temperature range of -55 °C to +175 °C. The SA51AHE3/54 maintains this clamping performance due to its low incremental surge resistance and stable avalanche junction.
Is SA51AHE3/54 suitable for automotive applications?
Yes, SA51AHE3/54 is AEC-Q101 qualified and explicitly rated for automotive use. Its construction includes glass-passivated junction, JESD201 Class 2 whisker-resistant matte tin plating, and operation up to +175 °C junction temperature - meeting requirements for engine control units, body control modules, and infotainment power supplies. The SA51AHE3/54 also complies with soldering standards JESD22-B106 and J-STD-002.
What does the "HE3" suffix mean in SA51AHE3/54?
The "HE3" suffix in SA51AHE3/54 indicates RoHS-compliant construction with AEC-Q101 qualification and JESD201 Class 2 whisker resistance. It distinguishes the part from commercial-grade "E3" variants (e.g., SA51A-E3/54), which lack automotive qualification and Class 2 whisker testing. The SA51AHE3/54 is intended for mission-critical automotive and industrial deployments where long-term reliability under thermal cycling and humidity is essential.
How does SA51AHE3/54 compare to bidirectional TVS diodes like SA51CA?
The SA51AHE3/54 is unidirectional and features a cathode band for polarity identification, while SA51CA is bidirectional with no polarity marking. SA51AHE3/54 provides forward conduction capability (VF = 3.5 V at 100 A) and is used where DC bias exists - such as 12 V supply lines - whereas SA51CA suits AC-coupled or symmetric signal lines like RS-485. Clamping behavior differs: SA51AHE3/54 clamps only in reverse; SA51CA clamps in both directions.
What is the maximum surge current rating for SA51AHE3/54?
The SA51AHE3/54 has a peak pulse current (IPPM) rating of 6.1 A under 10/1000 µs waveform conditions, and a non-repetitive forward surge current (IFSM) rating of 70 A for 10 ms half-sine wave. These ratings are interdependent: the 70 A IFSM applies only to forward conduction events (e.g., motor startup), while the 6.1 A IPPM defines reverse-biased transient handling. Both are validated per JEDEC standards and derated above TA = 25 °C per Figure 2 in the datasheet.
SA51AHE3/54 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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 6.1A
- 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)
SA51AHE3/54 FAQ
1.How can I place an order for SA51AHE3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA51AHE3/54 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 SA51AHE3/54 reliable?
The price and inventory of SA51AHE3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA51AHE3/54 is usually 5 days.
3.What payment methods are accepted for SA51AHE3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA51AHE3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA51AHE3/54?
SA51AHE3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA51AHE3/54 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 SA51AHE3/54?
For technical support, including SA51AHE3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA51AHE3/54 requirements.
6.How does Aetrix verify that SA51AHE3/54 is sourced from the original manufacturer or authorized distributors?
All SA51AHE3/54 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 SA51AHE3/54 meets industry standards.
7.What is the process for return or replacement of SA51AHE3/54?
All SA51AHE3/54 units undergo pre-shipment inspection (PSI). If there is an issue with SA51AHE3/54, 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 SA51AHE3/54 part is unused and in its original packaging.
Return procedure for SA51AHE3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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