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Vishay General Semiconductor - Diodes Division 1.5KE51CAHE3/51
- Part No.:
- 1.5KE51CAHE3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE51CAHE3/51.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:7,846
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Product details
Overview
1.5KE51CAHE3/51 from Vishay General Semiconductor is a bi-directional Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 48.5 V to 53.6 V breakdown voltage (VBR) at 1 mA, 43.6 V maximum stand-off voltage (VWM), 70.1 V clamping voltage (VC) at 21.4 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the 1.5KE51CAHE3/51 datasheet, 1.5KE51CAHE3/51 pinout, 1.5KE51CAHE3/51 application, or 1.5KE51CAHE3/51 equivalent, this device serves as a RoHS-compliant, AEC-Q101-qualified TVS for high-energy transient suppression where fast response (<1 ns), low clamping ratio, and bidirectional symmetry are critical design requirements.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, enabling single-device protection of AC-coupled or floating signal paths without polarity concerns. Its glass-passivated junction ensures stable VBR tolerance (±5%), low incremental surge resistance, and repeatable clamping performance under repetitive transients.
The device delivers 1500 W peak pulse power handling per 10/1000 µs waveform at TA = 25 °C, derating linearly above 25 °C with RθJA = 75 °C/W. It supports operating junction temperatures from –55 °C to +175 °C and meets JESD 201 Class 2 whisker resistance with HE3 suffix.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 48.5 V / 53.6 V at IT = 1 mA - defines reliable conduction onset threshold for transient clamping |
| VWM | 43.6 V - maximum continuous reverse working voltage before leakage exceeds 1 µA |
| VC @ IPPM | 70.1 V at 21.4 A - clamped voltage during 1500 W transient, limiting stress on downstream ICs |
| PPPM | 1500 W - peak pulse power capability with 10/1000 µs waveform, supporting lightning surge immunity |
| IPPM | 21.4 A - maximum non-repetitive peak pulse current corresponding to VC = 70.1 V |
| Junction Temp Range | –55 °C to +175 °C - enables deployment in under-hood automotive and industrial environments |
| Leakage @ VWM | ≤1 µA - ensures minimal standby power loss and signal integrity in high-impedance circuits |
Pinout & Package
Package: DO-201AD (Case Style 1.5KE), axial-leaded, molded epoxy body with matte tin-plated leads. Complies with UL 94 V-0 flammability rating and J-STD-002 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Transient current entry point (negative half-cycle) | Accepts reverse surge current during negative transients; symmetrical with cathode for bi-directional operation |
| Cathode (Lead 2) | Transient current entry point (positive half-cycle) | Accepts reverse surge current during positive transients; identical electrical behavior to anode due to bi-directional structure |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Identical VBR, VC, and IPPM in both polarities - eliminates need for dual-device placement on AC or differential lines |
| AEC-Q101 qualification | Validated for automotive applications including engine control modules and ADAS sensor interfaces |
| Glass passivated junction | Ensures tight VBR tolerance (±5%), long-term stability, and resistance to humidity-induced degradation |
| 1500 W pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-to-earth, 2 kV line-to-line) without failure |
| JESD 201 Class 2 whisker resistance | Enables reliable long-term solder joint integrity in high-reliability industrial and automotive assemblies |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN bus transceivers and analog sensor inputs (e.g., temperature, pressure) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bi-directional voltage clamp placed across signal/power pins to limit transient excursions below IC absolute maximum ratings. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V microcontrollers and analog front-ends during 100 V/100 ms load dump events. |
Use Scenario: Shielding digital input modules in programmable logic controllers from induced surges on 24 V DC field wiring. IC Role / Device Role / Timing Role: Primary overvoltage shunt element at terminal block entry, diverting energy before reaching optocoupler or level-shifter ICs. Use Value: Maintains functional safety integrity by clamping transients to ≤70.1 V within <1 ns, ensuring no false triggering or reset of control logic. |
| Telecom Line Interface | Consumer Power Adapter ESD |
Use Scenario: Safeguarding Ethernet PHYs and DSL line drivers against lightning-induced surges on outdoor copper pairs. IC Role / Device Role / Timing Role: First-stage protector in hybrid surge suppression circuits, absorbing bulk energy before secondary MOV or GDT stages. Use Value: Enables compliance with ITU-T K.20/K.21 immunity requirements via 1500 W peak power handling and low clamping ratio (VC/VBR ≈ 1.45). |
Use Scenario: Adding secondary-level surge protection to USB-C and barrel-jack inputs in wall adapters and chargers. IC Role / Device Role / Timing Role: Fast-reacting clamp across input rectifier output to suppress switching spikes and ESD events exceeding 8 kV contact discharge. Use Value: Extends product lifetime by preventing cumulative degradation of electrolytic capacitors and primary-side controllers under repeated 10/1000 µs transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51CA | Lower PPPM (600 W), smaller SMB package (vs. DO-201AD), higher VC/VBR ratio (1.52 vs. 1.45) | Better suited for space-constrained PCBs but less robust for high-energy surges like lightning | Select when board area is critical and surge threat level is limited to IEC 61000-4-2/4-4, not 4-5 |
| 1.5SMC51CA | Same PPPM (1500 W), SMC package (DO-214AB), slightly higher VC (71.4 V), same VBR range | Surface-mount alternative with comparable thermal performance and automated assembly compatibility | Choose for reflow-soldered designs requiring equivalent surge rating without through-hole assembly |
Compared with 1.5KE51CAHE3/51, SMBJ51CA trades surge robustness for compactness, while 1.5SMC51CA offers identical power handling in an SMT form factor - making the latter ideal for volume production where pick-and-place efficiency matters, and the former appropriate for legacy through-hole systems demanding maximum ruggedness.
Availability
1.5KE51CAHE3/51 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection, and consumer power adapter designs requiring stable component supply and AEC-Q101-qualified reliability.
Supply support for 1.5KE51CAHE3/51 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade qualification.
The 1.5KE series was engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure modes must be mitigated without compromising response speed or clamping precision.
FAQ
What is the breakdown voltage tolerance for 1.5KE51CAHE3/51?
The 1.5KE51CAHE3/51 has a specified breakdown voltage (VBR) range of 48.5 V to 53.6 V at test current IT = 1 mA, representing a ±5% tolerance around the nominal 51 V rating. This tight tolerance ensures predictable clamping onset across production lots and temperature ranges, critical for consistent protection in safety-critical systems.
Is 1.5KE51CAHE3/51 suitable for automotive applications?
Yes, 1.5KE51CAHE3/51 is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood environments. Its –55 °C to +175 °C operating junction temperature range, JESD 201 Class 2 whisker resistance, and robust 1500 W surge capability make it appropriate for protecting ECUs, ADAS sensors, and infotainment power rails against load dump and ISO 7637-2 transients.
How does the bi-directional configuration of 1.5KE51CAHE3/51 affect circuit placement?
The bi-directional nature of 1.5KE51CAHE3/51 means it has no polarity marking and functions identically in either orientation - simplifying layout and eliminating risk of reverse installation. This allows direct placement across AC-coupled lines, differential buses (e.g., RS-485), or ungrounded power rails without concern for anode/cathode alignment.
What is the clamping voltage of 1.5KE51CAHE3/51 at its rated peak pulse current?
The 1.5KE51CAHE3/51 clamps to a maximum of 70.1 V at its rated peak pulse current of 21.4 A (10/1000 µs waveform). This VC value reflects worst-case device behavior under standardized surge conditions and is used to verify that downstream components remain within their absolute maximum voltage ratings during transient events.
Does 1.5KE51CAHE3/51 require a heatsink for standard operation?
No heatsink is required for 1.5KE51CAHE3/51 under typical transient conditions, as its 1500 W rating applies to short-duration pulses (≤1 ms). However, its thermal resistance RθJA is 75 °C/W, so sustained power dissipation must remain below 6.5 W (its DC power rating) - meaning continuous operation near VWM demands adequate PCB copper area for heat spreading, not a discrete heatsink.
1.5KE51CAHE3/51 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 1.5KE
1.5KE51CAHE3/51 FAQ
1.How can I place an order for 1.5KE51CAHE3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE51CAHE3/51 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 1.5KE51CAHE3/51 reliable?
The price and inventory of 1.5KE51CAHE3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE51CAHE3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KE51CAHE3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE51CAHE3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE51CAHE3/51?
1.5KE51CAHE3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE51CAHE3/51 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 1.5KE51CAHE3/51?
For technical support, including 1.5KE51CAHE3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE51CAHE3/51 requirements.
6.How does Aetrix verify that 1.5KE51CAHE3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KE51CAHE3/51 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 1.5KE51CAHE3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KE51CAHE3/51?
All 1.5KE51CAHE3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE51CAHE3/51, 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 1.5KE51CAHE3/51 part is unused and in its original packaging.
Return procedure for 1.5KE51CAHE3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE51CAHE3/51 Tags
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Diodes Incorporated
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