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Vishay General Semiconductor - Diodes Division 1.5KE51CA-E3/51
- Part No.:
- 1.5KE51CA-E3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE51CA-E3/51.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:6,707
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Product details
Overview
1.5KE51CA-E3/51 from Vishay General Semiconductor is a bidirectional Transient Voltage Suppressor (TVS) diode designed for clamping voltage transients on signal and power lines. It features a 51 V breakdown voltage (VBR = 48.5–53.6 V at 1 mA), 1500 W peak pulse power (10/1000 µs), 70.1 V maximum clamping voltage (VC) at 21.4 A, 1.0 µA max reverse leakage at 43.6 V, and operates from –55 °C to +175 °C - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the 1.5KE51CA-E3/51 datasheet, 1.5KE51CA-E3/51 pinout, 1.5KE51CA-E3/51 application, or 1.5KE51CA-E3/51 equivalent, this page delivers verified electrical specs, bidirectional clamping behavior, JEDEC 1.5KE package details, thermal derating curves, and direct alternatives for ESD/lightning surge protection design.
Technical Context
This TVS diode uses a glass-passivated silicon junction optimized for fast transient response (<1 ns) and low incremental surge resistance. Its bidirectional structure enables symmetrical clamping in both polarities without polarity marking, supporting AC-coupled lines and differential signaling paths where voltage reversal occurs.
It complies with UL 497B (QVGQ2 recognition) and meets JESD 201 Class 1A whisker testing. The device is rated for 1500 W peak pulse power under 10/1000 µs waveform at 0.01% duty cycle, with thermal resistance RθJL = 15.4 °C/W enabling effective lead-based heat dissipation during surge events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 48.5 V / 53.6 V at 1 mA - defines reliable conduction onset across temperature and unit variation |
| VWM | 43.6 V - maximum continuous working voltage before leakage exceeds 1.0 µA |
| VC @ IPPM | 70.1 V at 21.4 A - clamped voltage seen by protected circuit during full-rated surge |
| PPPM | 1500 W (10/1000 µs) - surge energy handling capacity for lightning/inductive switching events |
| TJ range | –55 °C to +175 °C - supports under-hood automotive and high-temp industrial environments |
| Package | JEDEC DO-201AD (Case Style 1.5KE) - axial-leaded, epoxy-molded, UL 94 V-0 rated body |
| RoHS | E3 suffix - RoHS-compliant matte tin-plated leads, J-STD-002 solderable |
Pinout & Package
1.5KE51CA-E3/51 uses the standard axial-leaded DO-201AD package (Case Style 1.5KE), with no polarity marking due to its bidirectional construction. Leads are matte tin-plated, compliant with JESD 22-B102 solderability and JESD 201 Class 1A whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional current path | No functional distinction - either lead connects to line or ground; clamps ±70.1 V transients equally |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable VBR tolerance and long-term reliability under repeated surge stress |
| 1500 W peak pulse rating | Withstands IEC 61000-4-5 Level 4 (4 kV) surges when properly mounted with short traces |
| Sub-nanosecond response | Clamps transients within 1 ns - faster than MOVs or polymer-based protectors |
| UL 497B recognized (QVGQ2) | Validated for telecom and industrial signal-line protection per safety-critical standards |
| AEC-Q101 qualified variants available | 1.5KE51CAHE3_B version meets automotive-grade stress testing (not applicable to E3/51) |
Applications
| Automotive Sensor Interface | Industrial PLC Analog Input |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor front-ends (e.g., pressure, temperature) from load-dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between signal line and chassis ground, absorbing ±100 V transients before IC input stages. Use Value: Limits voltage excursion to ≤70.1 V during 21.4 A surge, preserving ADC reference integrity and preventing latch-up in microcontrollers. | Use Scenario: Shielding 4–20 mA current-loop inputs in programmable logic controllers against field-wiring induced surges and ESD. IC Role / Device Role / Timing Role: Primary overvoltage clamp on loop-powered analog input terminals, operating continuously at 24 VDC with transient headroom. Use Value: Maintains VWM = 43.6 V margin above 24 V nominal, ensuring zero leakage impact on loop accuracy while clamping lightning-induced spikes. |
| Telecom Line Protection | Consumer Power Adapter Output |
Use Scenario: Safeguarding Ethernet PHY magnetics and DSL line drivers from induced lightning surges on outdoor copper pairs. IC Role / Device Role / Timing Role: Secondary-level protector downstream of gas discharge tubes, handling residual fast-rising transients. Use Value: Delivers 70.1 V clamping at 21.4 A with <1 ns response, limiting stress on PHY ICs rated for 3.3 V or 5 V operation. | Use Scenario: Suppressing output overvoltage caused by feedback-loop failure or Zener regulator dropout in wall adapters. IC Role / Device Role / Timing Role: Fail-safe crowbar element across DC output, triggered only during catastrophic overvoltage (>43.6 V). Use Value: Prevents downstream USB-C PD controllers or charging ICs from exposure to >70.1 V, avoiding permanent damage during fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51CA | DO-214AA package (SMB), 600 W PPPM, VC = 87.1 V @ 6.9 A, lower surge rating | Surface-mount layout; suited for space-constrained PCBs but requires higher board area for thermal relief | Select SMBJ51CA when automated SMT assembly and smaller footprint outweigh need for 1500 W surge capacity |
| 1.5SMC51CA | DO-214AB package (SMC), 1500 W PPPM, VC = 70.1 V @ 21.4 A, identical clamping but SMD | No through-hole mounting; requires reflow-compatible pad design and thermal vias for sustained power dissipation | Choose 1.5SMC51CA for high-volume SMT production where axial leads are incompatible with assembly process |
Compared with 1.5KE51CA-E3/51, SMBJ51CA offers compact SMT integration at reduced surge robustness, while 1.5SMC51CA matches its 1500 W/70.1 V performance in surface-mount form - both require layout adjustments for thermal management and do not support drop-in replacement due to differing packages and lead geometry.
Availability
1.5KE51CA-E3/51 is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O conditioning, telecom line safeguarding, and consumer power adapter overvoltage suppression requiring stable component supply across multi-year production cycles.
Supply support for 1.5KE51CA-E3/51 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 AEC-Q qualification.
The 1.5KE series was engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where robustness against lightning, ESD, and inductive switching surges is non-negotiable.
FAQ
What is the breakdown voltage tolerance for 1.5KE51CA-E3/51?
The 1.5KE51CA-E3/51 has a specified breakdown voltage range of 48.5 V to 53.6 V at 1 mA test current, representing ±5.2% tolerance about the nominal 51 V rating. This VBR window ensures consistent clamping onset across units and temperature, critical for predictable protection in bidirectional signal paths.
Is 1.5KE51CA-E3/51 suitable for automotive applications?
The 1.5KE51CA-E3/51 is RoHS-compliant and rated for –55 °C to +175 °C operation, but it is not AEC-Q101 qualified. For automotive use, Vishay offers the 1.5KE51CAHE3_B variant - same electrical specs but validated per AEC-Q101. Engineers must select the HE3 suffix version for under-hood or safety-critical vehicle systems.
How does the bidirectional nature of 1.5KE51CA-E3/51 affect PCB layout?
Because 1.5KE51CA-E3/51 is bidirectional, it has no cathode marking and either lead may connect to signal or ground - simplifying layout on AC-coupled or differential lines. However, its axial DO-201AD package requires adequate creepage distance (≥3.2 mm) and thermal relief on both leads to sustain 1500 W surge dissipation without trace delamination.
What is the maximum clamping voltage of 1.5KE51CA-E3/51 under full-rated surge?
The 1.5KE51CA-E3/51 exhibits a maximum clamping voltage (VC) of 70.1 V when subjected to its full-rated 21.4 A peak pulse current (IPPM) under 10/1000 µs waveform. This value is guaranteed across temperature and unit variation, defining the upper voltage limit imposed on protected circuitry during worst-case transients.
Can 1.5KE51CA-E3/51 be used in parallel for higher surge capability?
Yes, 1.5KE51CA-E3/51 can be paralleled to increase total peak pulse power handling, but matching VBR (48.5–53.6 V) between units is essential to ensure balanced current sharing. Uneven distribution may cause one device to absorb disproportionate energy and fail prematurely - matched lots or derating by ≥20% is recommended for parallel configurations.
1.5KE51CA-E3/51 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- TransZorb®
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 43.6V
- Voltage - Breakdown (Min):
- 48.5V
- Voltage - Clamping (Max) @ Ipp:
- 70.1V
- Current - Peak Pulse (10/1000µs):
- 21.4A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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:
- 1.5KE
1.5KE51CA-E3/51 FAQ
1.How can I place an order for 1.5KE51CA-E3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE51CA-E3/51 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 1.5KE51CA-E3/51 reliable?
The price and inventory of 1.5KE51CA-E3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE51CA-E3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KE51CA-E3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE51CA-E3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE51CA-E3/51?
1.5KE51CA-E3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE51CA-E3/51 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 1.5KE51CA-E3/51?
For technical support, including 1.5KE51CA-E3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE51CA-E3/51 requirements.
6.How does Aetrix verify that 1.5KE51CA-E3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KE51CA-E3/51 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 1.5KE51CA-E3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KE51CA-E3/51?
All 1.5KE51CA-E3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE51CA-E3/51, 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 1.5KE51CA-E3/51 part is unused and in its original packaging.
Return procedure for 1.5KE51CA-E3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE51CA-E3/51 Tags
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