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Vishay General Semiconductor - Diodes Division SA51CAHE3/54
- Part No.:
- SA51CAHE3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA51CAHE3/54.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,144
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Product details
Overview
SA51CAHE3/54 from Vishay General Semiconductor is a bidirectional Transient Voltage Suppressor (TVS) diode in DO-15 package, rated for 51 V stand-off voltage (VWM), 500 W peak pulse power (10/1000 μs), 82.4 V maximum clamping voltage at 6.1 A peak pulse current, and AEC-Q101 qualified for automotive use. It protects signal lines and power rails in sensor interfaces, motor control circuits, and industrial I/O modules against ESD and inductive switching transients.
For engineers reviewing the SA51CAHE3/54 datasheet, SA51CAHE3/54 pinout, SA51CAHE3/54 application, or SA51CAHE3/54 equivalent, key selection criteria include bidirectional clamping behavior, DO-15 mechanical compatibility, 175 °C max junction temperature, low incremental surge resistance, and compliance with JESD 201 Class 2 whisker testing.
Technical Context
This device operates as a voltage-clamped transient protector with symmetrical breakdown in both directions (VBR min/max = 56.7 V / 62.7 V at 1.0 mA), enabling protection of AC-coupled or floating signal paths without polarity concerns. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1 ns).
The SA51CAHE3/54 delivers 500 W peak pulse power under standardized 10/1000 μs waveform conditions, with clamping voltage tightly bounded at 82.4 V up to 6.1 A IPPM - critical for safeguarding 5 V–48 V logic and analog front-ends. Thermal derating follows a defined curve down to zero power at 175 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for protected circuit's normal operating range. |
| VBR (min/max) | 56.7 V / 62.7 V at 1.0 mA - Confirmed breakdown threshold window; ensures reliable turn-on above system overvoltage margin. |
| VC @ IPPM | 82.4 V at 6.1 A - Measured clamping voltage during 10/1000 μs surge; defines worst-case voltage seen by downstream ICs. |
| PPPM | 500 W - Peak pulse power handling per single transient; supports robust protection against IEC 61000-4-5 Level 4 surges. |
| IFSM | Not applicable - Bidirectional type has no forward surge rating; only unidirectional variants specify 70 A IFSM. |
| TJ max | 175 °C - Maximum junction temperature; enables operation in under-hood automotive or high-ambient industrial environments. |
| Leakage ID | <1.0 μA at 51 V - Ultra-low reverse leakage preserves signal integrity and battery life in always-on sensor nodes. |
Pinout & Package
SA51CAHE3/54 uses the DO-15 (DO-204AC) axial-leaded package: molded epoxy body, matte tin-plated leads solderable per J-STD-002, RoHS compliant, and AEC-Q101 qualified. No polarity marking - bidirectional symmetry eliminates orientation concerns during placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically; clamps voltage across them when either exceeds VBR in either polarity - ideal for AC lines or differential pairs. |
| Lead 1 / Lead 2 | PCB interconnect interface | Matte tin-plated copper leads support wave/solder reflow (275 °C max, 10 s); JESD 201 Class 2 whisker resistance ensures long-term reliability in vibration-prone systems. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable VBR tolerance and <1.0 μA leakage at VWM, critical for precision analog and low-power IoT sensors. |
| 500 W peak pulse power (10/1000 μs) | Withstands repeated lightning-induced surges per IEC 61000-4-5; supports industrial fieldbus and automotive LIN bus protection. |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock - suitable for engine control and ADAS sensor interfaces. |
| DO-15 mechanical standardization | Ensures drop-in replacement capability across legacy designs; compatible with automated axial insertion and wave soldering equipment. |
| UL 94 V-0 molding compound | Provides flame-retardant housing essential for safety-critical applications in industrial control panels and medical devices. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and position sensor outputs from load dump and ESD events in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt transients before reaching sensitive ASICs. Use Value: Clamps to ≤82.4 V during 6.1 A surge, preventing damage to 5 V–12 V sensor supply rails and maintaining signal fidelity under ISO 7637-2 Pulse 5a stress. | Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers exposed to relay coil flyback and motor drive noise. IC Role / Device Role / Timing Role: Primary overvoltage clamp on field-side inputs, mounted adjacent to terminal blocks to minimize inductance. Use Value: Limits transient voltage to 82.4 V within nanoseconds, ensuring immunity to 1 kV/μs fast edges per IEC 61000-4-4 and preserving input logic thresholds. |
| Consumer Appliance Motor Control | Telecom Power Rail Protection |
Use Scenario: Suppressing inductive kickback from brushed DC motors in washing machines and HVAC blowers. IC Role / Device Role / Timing Role: Parallel-connected TVS across motor terminals to absorb energy from commutation spikes. Use Value: Dissipates 500 W peak pulses without degradation, extending MOSFET lifetime and eliminating false resets caused by >100 V transients. | Use Scenario: Protecting 48 V PoE-powered Ethernet switch ports against lightning-induced surges on data + power lines. IC Role / Device Role / Timing Role: Secondary-level clamping device on DC input rail, coordinated with primary GDT or MOV stages. Use Value: Provides precise 51 V standoff and 82.4 V clamping to avoid overvoltage shutdown while meeting UL 60950-1 insulation coordination requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51CA | Same VWM (51 V) and bidirectional configuration, but SMC (DO-214AB) surface-mount package; 400 W PPPM. | Requires PCB redesign for SMD layout; better suited for space-constrained consumer electronics vs. through-hole industrial assemblies. | Select SMAJ51CA only if board real estate is limited and reflow assembly is available. |
| 1.5KE51CA | Same DO-15 package and 51 V rating, but higher 1500 W PPPM; larger junction area increases capacitance (~200 pF vs. ~100 pF for SA51CAHE3/54). | Higher clamping voltage (93.6 V) and greater parasitic capacitance limit use in high-speed data lines. | Choose 1.5KE51CA for heavy-duty industrial surge zones where speed is secondary to energy absorption. |
Compared with SMAJ51CA and 1.5KE51CA, SA51CAHE3/54 offers optimal balance of compact DO-15 form factor, AEC-Q101 qualification, low clamping voltage (82.4 V), and moderate 500 W surge capacity - making it preferred for cost-sensitive, automotive-qualified, and medium-energy protection tasks.
Availability
SA51CAHE3/54 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, appliance motor control circuits, and telecom power rail protection requiring stable component supply and long-term lifecycle support.
Supply support for SA51CAHE3/54 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, efficiency, and application-specific optimization.
The SAxxCA series targets high-reliability transient suppression in harsh environments, designed specifically for automotive, industrial, and telecom applications demanding AEC-Q101 qualification, low leakage, and repeatable clamping performance.
FAQ
What is the clamping voltage of SA51CAHE3/54 at its rated peak pulse current?
The SA51CAHE3/54 has a maximum clamping voltage (VC) of 82.4 V at 6.1 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured and guaranteed per Vishay Document Number 88378, ensuring predictable overvoltage limiting for downstream components in the protected circuit. The SA51CAHE3/54 maintains this clamping performance across its full operating temperature range.
Is SA51CAHE3/54 suitable for automotive applications?
Yes, SA51CAHE3/54 is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood and chassis-mounted modules. Its 175 °C maximum junction temperature, JESD 201 Class 2 whisker resistance, and robust surge handling make it appropriate for engine control units, ADAS sensor interfaces, and body electronics. The SA51CAHE3/54 meets automotive reliability standards without requiring additional qualification testing.
Does SA51CAHE3/54 have polarity markings on the package?
No, SA51CAHE3/54 has no polarity markings because it is a bidirectional TVS diode - both terminals are functionally identical. The DO-15 package is unmarked, reflecting symmetrical electrical behavior in either direction. This simplifies PCB layout and eliminates orientation errors during manual or automated assembly. The SA51CAHE3/54 functions identically regardless of lead orientation.
What is the maximum reverse leakage current for SA51CAHE3/54 at its stand-off voltage?
The maximum reverse leakage current (ID) for SA51CAHE3/54 is 1.0 μA at 51 V (VWM) and 25 °C, per Vishay's published electrical characteristics table. This ultra-low leakage preserves signal integrity in high-impedance sensor circuits and minimizes standby power loss in battery-operated systems. The SA51CAHE3/54 maintains leakage below 5 μA even at elevated temperatures up to 125 °C.
Can SA51CAHE3/54 replace unidirectional TVS diodes like SA51AHE3/54?
No, SA51CAHE3/54 cannot directly replace unidirectional types such as SA51AHE3/54 because it lacks a defined anode/cathode and conducts symmetrically in both directions. Using SA51CAHE3/54 in a DC-biased circuit may cause unintended conduction or failure to clamp correctly. The SA51CAHE3/54 is intended only for AC-coupled, floating, or dual-rail protection where polarity independence is required.
SA51CAHE3/54 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:
- -
- Bidirectional Channels:
- 1
- 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)
SA51CAHE3/54 FAQ
1.How can I place an order for SA51CAHE3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA51CAHE3/54 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 SA51CAHE3/54 reliable?
The price and inventory of SA51CAHE3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA51CAHE3/54 is usually 5 days.
3.What payment methods are accepted for SA51CAHE3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA51CAHE3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA51CAHE3/54?
SA51CAHE3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA51CAHE3/54 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 SA51CAHE3/54?
For technical support, including SA51CAHE3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA51CAHE3/54 requirements.
6.How does Aetrix verify that SA51CAHE3/54 is sourced from the original manufacturer or authorized distributors?
All SA51CAHE3/54 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 SA51CAHE3/54 meets industry standards.
7.What is the process for return or replacement of SA51CAHE3/54?
All SA51CAHE3/54 units undergo pre-shipment inspection (PSI). If there is an issue with SA51CAHE3/54, 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 SA51CAHE3/54 part is unused and in its original packaging.
Return procedure for SA51CAHE3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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