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Vishay General Semiconductor - Diodes Division SA51A-E3/54
- Part No.:
- SA51A-E3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA51A-E3/54.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,796
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Product details
Overview
SA51A-E3/54 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode in DO-15 package, designed for circuit protection against ESD, lightning surges, and inductive switching 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 (VC) at 6.1 A peak pulse current, and 500 W peak pulse power rating with 10/1000 μs waveform.
For engineers reviewing the SA51A-E3/54 datasheet, SA51A-E3/54 pinout, SA51A-E3/54 application, or SA51A-E3/54 equivalent, this device is selected for robust overvoltage protection in DC power rails, automotive sensor interfaces, and industrial I/O lines where fast response (<1 ns), low clamping ratio, and AEC-Q101 qualification are required.
Technical Context
The SA51A-E3/54 operates as a silicon avalanche diode with glass-passivated junction, enabling sub-nanosecond response to transient events. Its unidirectional polarity uses a cathode band marking and supports reverse-biased clamping only - forward conduction is limited to 3.5 V at 100 A surge.
Thermal design relies on DO-15 lead-frame construction with 175 °C max junction temperature and 3.0 W steady-state power dissipation at 75 °C lead temperature. Derating follows linear curves above 25 °C ambient, and surge capability is validated per 10/1000 μs waveform with 0.01% duty cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - maximum continuous reverse operating voltage before clamping begins; sets upper limit for protected line nominal DC voltage. |
| VBR (min/max) | 56.7 V / 62.7 V at 1 mA - guaranteed avalanche initiation range; ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 82.4 V at 6.1 A - clamped voltage during 10/1000 μs surge; defines worst-case stress on downstream ICs. |
| PPPM | 500 W - peak pulse power handling with standard 10/1000 μs waveform; validates protection level against common surge standards (IEC 61000-4-5). |
| IFSM | 70 A - non-repetitive forward surge current (10 ms half-sine); supports short-term overload tolerance in power rail applications. |
| TJ max | 175 °C - maximum junction temperature; enables operation in under-hood automotive or high-ambient industrial environments. |
| Leakage ID | 1.0 μA at VWM - ultra-low reverse leakage preserves battery life and signal integrity in always-on circuits. |
Pinout & Package
SA51A-E3/54 is housed in DO-15 (DO-204AC) axial-leaded package with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. The cathode is marked by a color band on the body; polarity must be observed during PCB layout to ensure correct reverse-bias clamping orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Current entry terminal in forward bias; connected to lower-potential side of protected line. | Must tie to ground or low-side reference when used in standard shunt configuration; incorrect anode/cathode routing disables protection. |
| Cathode (banded end) | Current exit terminal in forward bias; connected to higher-potential side (e.g., +12 V rail or signal line). | Acts as clamping node - voltage at this pin is limited to ≤82.4 V during transients; trace routing must minimize inductance to preserve response speed. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable, repeatable avalanche characteristics over 1000+ surge events without parameter drift or degradation. |
| AEC-Q101 qualified (E3 suffix variant) | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock - suitable for engine control, ADAS, and body electronics. |
| 500 W peak pulse power (10/1000 μs) | Meets IEC 61000-4-5 Level 3 (1 kV line-to-line, 2 kV line-to-ground) surge immunity requirements without external series impedance. |
| Low incremental clamping resistance | Clamping voltage rises only ~25.7 V above VBR (82.4 V – 56.7 V), minimizing let-through energy to sensitive loads. |
| RoHS-compliant, JESD 201 Class 1A whisker tested | Ensures long-term solder joint integrity in reflow and thermal cycling environments typical of industrial and automotive assembly. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12 V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Shunt-clamping TVS placed between VBAT and chassis ground to clamp transients before they reach LDOs and microcontrollers. Use Value: Withstand 500 W surges up to 6.1 A while limiting clamped voltage to 82.4 V - protecting downstream 80 V-rated input stages. |
Use Scenario: 4–20 mA current loop transmitters interfacing with PLC analog inputs in factory automation. IC Role / Device Role / Timing Role: Bidirectional protection is not used; SA51A-E3/54 provides unidirectional clamping on supply rail to suppress coupling from nearby motor drives. Use Value: 1.0 μA leakage at 51 V preserves loop accuracy; DO-15 axial form factor allows through-hole mounting near connector entry points. |
| Consumer USB Power Adapter Input | Telecom Line Card Surge Protection |
Use Scenario: Secondary-side 5 V/9 V/12 V DC outputs of AC-DC adapters subject to conducted EFT (IEC 61000-4-4) and surge. IC Role / Device Role / Timing Role: Final-stage TVS on output rail to prevent overvoltage damage to connected devices during adapter fault conditions. Use Value: 82.4 V clamping ensures no stress exceeds 24 V-rated USB PD controller ICs; 175 °C TJ max supports enclosed thermal environments. |
Use Scenario: Protection of Ethernet PHY power pins (e.g., 3.3 V or 5 V bias rails) on telecom line cards exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary shunt protector on DC bias lines feeding magnetics and PHY ICs, placed upstream of local decoupling. Use Value: 500 W rating handles multi-kV induced surges; DO-15 package allows manual rework and meets IPC-A-610 Class 3 soldering 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 | Same VWM (51 V), but SMC (DO-214AB) surface-mount package; 600 W PPPM; slightly higher VC (87.1 V at 5.7 A). | Requires PCB redesign for SMT placement; better suited for high-density layouts where axial DO-15 is impractical. | Select SMAJ51A when board space is constrained and automated assembly is preferred over through-hole. |
| 1.5KE51A | Higher PPPM (1500 W), same DO-15 package; VWM = 51 V, VBR = 56.7–62.7 V, VC = 84.5 V at 17.7 A. | Over-spec'd for most 500 W use cases; larger junction capacitance may affect high-speed signal lines. | Choose 1.5KE51A only when legacy designs require backward compatibility or surge threat level exceeds IEC 61000-4-5 Level 4. |
Compared with SMAJ51A and 1.5KE51A, SA51A-E3/54 offers optimal balance of proven DO-15 reliability, AEC-Q101 qualification, and precise 500 W rating - making it ideal for cost-sensitive, thermally demanding, or automotive-qualified applications where exact surge margin and through-hole serviceability matter.
Availability
SA51A-E3/54 is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor modules, and telecom line card designs requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for SA51A-E3/54 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 protection devices with emphasis on reliability, power efficiency, and automotive-grade validation.
The SAxxA series is part of Vishay's TRANSZORB® TVS family, engineered specifically for robust, standardized transient suppression in harsh environments - targeting automotive, industrial, and infrastructure applications where failure is not an option.
FAQ
What is the maximum clamping voltage of the SA51A-E3/54 under standard surge conditions?
The SA51A-E3/54 exhibits a maximum clamping voltage (VC) of 82.4 V when subjected to its rated peak pulse current of 6.1 A using the 10/1000 μs waveform. This value is measured per JEDEC standards and guarantees that downstream components see no more than 82.4 V during such transients - critical for protecting 80 V-rated ICs in automotive and industrial systems. The SA51A-E3/54 maintains this performance across its full operating temperature range.
Is the SA51A-E3/54 suitable for automotive applications?
Yes, the SA51A-E3/54 is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood environments. Its DO-15 package, 175 °C maximum junction temperature, and validation across temperature cycling, humidity bias, and mechanical shock make it appropriate for engine control units, body electronics, and ADAS sensor modules. The SA51A-E3/54 meets stringent automotive reliability requirements without derating.
How does the SA51A-E3/54 differ from bidirectional TVS diodes like SA51CA?
The SA51A-E3/54 is unidirectional and functions only in reverse-bias clamping mode, with a cathode band marking polarity; SA51CA is bidirectional and symmetrical, lacking polarity markings and clamping in both directions. This makes SA51A-E3/54 ideal for DC power rail protection where polarity is fixed, while SA51CA suits AC-coupled or floating signal lines. The SA51A-E3/54 has identical VWM, VBR, and PPPM specs but differs fundamentally in conduction behavior and layout requirements.
What is the leakage current specification for SA51A-E3/54 at its stand-off voltage?
The SA51A-E3/54 specifies a maximum reverse leakage current (ID) of 1.0 μA at its 51 V stand-off voltage (VWM) and 25 °C ambient temperature. This ultra-low leakage preserves system efficiency in battery-powered or always-on applications and avoids false triggering in high-impedance sensing circuits. Leakage remains below 5 μA up to 125 °C, ensuring stability across industrial operating ranges. The SA51A-E3/54 achieves this via tightly controlled avalanche junction processing.
Can SA51A-E3/54 be used in parallel for higher surge current handling?
No - SA51A-E3/54 is not recommended for parallel operation due to mismatch in VBR (56.7–62.7 V) and dynamic impedance, which causes uneven current sharing and potential thermal runaway. For higher surge ratings, select a single higher-power device like 1.5KE51A (1500 W) or verify matched binning with Vishay. The SA51A-E3/54 is characterized and qualified as a standalone protection element; parallel use voids AEC-Q101 compliance and invalidates published clamping performance.
SA51A-E3/54 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA51A-E3/54 FAQ
1.How can I place an order for SA51A-E3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA51A-E3/54 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 SA51A-E3/54 reliable?
The price and inventory of SA51A-E3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA51A-E3/54 is usually 5 days.
3.What payment methods are accepted for SA51A-E3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA51A-E3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA51A-E3/54?
SA51A-E3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA51A-E3/54 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 SA51A-E3/54?
For technical support, including SA51A-E3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA51A-E3/54 requirements.
6.How does Aetrix verify that SA51A-E3/54 is sourced from the original manufacturer or authorized distributors?
All SA51A-E3/54 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 SA51A-E3/54 meets industry standards.
7.What is the process for return or replacement of SA51A-E3/54?
All SA51A-E3/54 units undergo pre-shipment inspection (PSI). If there is an issue with SA51A-E3/54, 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 SA51A-E3/54 part is unused and in its original packaging.
Return procedure for SA51A-E3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA51A-E3/54 Tags
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