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Vishay General Semiconductor - Diodes Division 1.5KE18CA/54
- Part No.:
- 1.5KE18CA/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE18CA/54.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:2,883
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Product details
Overview
1.5KE18CA from Vishay General Semiconductor is a bidirectional Transient Voltage Suppressor (TVS) diode designed for clamping voltage transients on power and signal lines. It features a 1500 W peak pulse power rating (10/1000 µs), 17.1–18.9 V breakdown voltage (VBR) at 1 mA, 15.3 V maximum standoff voltage (VWM), and clamps to ≤25.2 V at 59.5 A peak pulse current - used in automotive sensor protection and industrial I/O interface surge suppression.
For engineers reviewing the 1.5KE18CA datasheet, 1.5KE18CA pinout, 1.5KE18CA application, or 1.5KE18CA equivalent, this page delivers verified electrical parameters, bidirectional clamping behavior, JEDEC 1.5KE package details, thermal derating curves, and AEC-Q101-qualified alternatives - all critical for ESD/lightning transient design validation.
Technical Context
This device operates as a silicon avalanche diode with glass-passivated junction, delivering sub-nanosecond response time (<1 ns) and low incremental surge resistance. Its bidirectional structure enables symmetrical clamping across both polarities without polarity marking, supporting AC-coupled lines and differential interfaces.
Rated for -55 °C to +175 °C junction temperature, it sustains 1500 W peak pulse power under 10/1000 µs waveform at 0.01% duty cycle and exhibits 0.089 %/°C temperature coefficient of VBR. The molded epoxy case meets UL 94 V-0 and supports solder dip up to 275 °C for 10 s.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 17.1 V / 18.9 V at 1 mA - defines reliable avalanche initiation threshold for bidirectional overvoltage detection |
| VWM | 15.3 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA |
| VC @ IPPM | ≤25.2 V at 59.5 A - clamping voltage during 10/1000 µs surge, limiting downstream IC stress |
| PPPM | 1500 W - peak transient power handling capacity, enabling protection against lightning-induced surges per IEC 61000-4-5 |
| TJ max | +175 °C - high-temperature operation support for under-hood automotive and industrial motor drive environments |
| RθJA | 75 °C/W - thermal resistance from junction to ambient, guiding heatsink requirements for repetitive surge conditions |
| Leakage @ VWM | ≤1 μA - ensures minimal standby power loss and signal integrity in high-impedance circuits |
Pinout & Package
Package: JEDEC Case Style 1.5KE - axial-leaded, molded epoxy body (1.0" × 0.210" diameter), UL 94 V-0 rated, matte tin-plated leads compliant with J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (bidirectional) | Reversible avalanche junction | No polarity marking; terminals function identically in either direction - simplifies layout for AC or floating lines |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable VBR tolerance and long-term reliability under humidity and thermal cycling |
| 1500 W peak pulse power (10/1000 µs) | Meets IEC 61000-4-5 Level 4 surge immunity for industrial and automotive electronics |
| Sub-nanosecond response time | Clamps transients before sensitive ICs experience damaging overvoltage - critical for MOSFET gate protection |
| AEC-Q101 qualified (HE3 variants) | Validated for automotive applications including engine control units and ADAS sensor interfaces |
| UL 94 V-0 molding compound | Prevents flame propagation in safety-critical enclosures per regulatory compliance requirements |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load-dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt surge energy before reaching signal conditioning circuitry. Use Value: Limits transient voltage to ≤25.2 V during 59.5 A surges, preventing latch-up or gate oxide rupture in 3.3 V/5 V microcontrollers and op-amps. |
Use Scenario: Shielding 24 V DC digital input modules in programmable logic controllers from inductive kickback and field wiring surges. IC Role / Device Role / Timing Role: Primary front-end TVS on each channel, coordinated with series impedance to meet IEC 61000-4-4 EFT and IEC 61000-4-5 surge standards. Use Value: Withstands 1500 W pulses while maintaining <1 μA leakage at 15.3 V, ensuring no false triggering during normal 24 V operation. |
| Telecom Line Interface | Consumer Power Adapter Input |
Use Scenario: Safeguarding Ethernet PHYs and RS-485 transceivers connected to outdoor cabling exposed to induced lightning per R.E.A. P.E. 60. IC Role / Device Role / Timing Role: Bidirectional TVS across differential pairs (e.g., A/B lines), leveraging symmetric clamping to preserve common-mode rejection. Use Value: Clamps 10/1000 µs surges to ≤25.2 V with 0.089 %/°C VBR drift, ensuring consistent protection across -40 °C to +85 °C ambient ranges. |
Use Scenario: Secondary-side transient suppression on 12 V DC output rails of wall-mounted AC/DC adapters for smart home devices. IC Role / Device Role / Timing Role: Final-stage clamp after bulk filtering and regulation, absorbing residual switching noise and external coupling events. Use Value: Delivers 1500 W capability in compact 1.5KE package, eliminating need for larger MOVs while maintaining RoHS-compliant lead finish. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA | Lower PPPM (600 W), smaller SMB package (3.5 mm × 4.5 mm), same VBR range (17.1–18.9 V) | Better suited for space-constrained PCBs; not rated for 1500 W surges or AEC-Q101 unless specified | Select when board area is limited and surge threat level is ≤600 W (IEC 61000-4-5 Level 3) |
| 1.5KE18CAHE3_B | Identical electrical specs; adds AEC-Q101 qualification, JESD 201 Class 2 whisker resistance, and enhanced traceability | Required for automotive production; supports PPAP documentation and long-term supply continuity | Choose for OEM automotive designs where qualification and supply chain rigor are mandatory |
Compared with 1.5KE18CA, SMBJ18CA trades peak power headroom for footprint reduction, while 1.5KE18CAHE3_B retains full 1500 W capability with certified automotive reliability - enabling direct substitution only when qualification status and thermal margin align with system requirements.
Availability
1.5KE18CA is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O hardening, and telecom line interface applications requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for 1.5KE18CA 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, power handling, and automotive-grade qualification.
The 1.5KE family was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness against lightning, EFT, and load dump is non-negotiable.
FAQ
What is the breakdown voltage tolerance for 1.5KE18CA?
The 1.5KE18CA has a guaranteed breakdown voltage (VBR) range of 17.1 V to 18.9 V at 1 mA test current, representing ±5.6% tolerance around the nominal 18 V rating. This tight spread ensures predictable clamping onset across production lots and supports precise system-level surge margin analysis without overspecifying downstream components.
Does 1.5KE18CA require a heatsink for standard operation?
No heatsink is required for 1.5KE18CA under single-pulse or low-duty-cycle surge conditions due to its 1500 W peak rating and 75 °C/W junction-to-ambient thermal resistance. However, for repetitive surges above 0.01% duty cycle, PCB copper area or localized thermal relief should be added to maintain TJ ≤175 °C - confirmed via derating curve in Figure 2 of Vishay document 88301.
Is 1.5KE18CA compatible with lead-free reflow processes?
Yes, 1.5KE18CA features matte tin-plated leads qualified per J-STD-002 and JESD 22-B102, supporting standard lead-free reflow profiles (peak ≤260 °C). Its epoxy body withstands solder dip up to 275 °C for 10 s, making it compatible with wave soldering and selective reflow - verified in Vishay's mechanical data section.
How does the bidirectional nature of 1.5KE18CA affect PCB layout?
The 1.5KE18CA has no polarity marking and functions identically in both directions, eliminating orientation concerns during placement. This simplifies layout for AC-coupled lines, differential buses (e.g., RS-485), and floating grounds - unlike unidirectional variants that require strict cathode alignment toward the protected side.
What is the maximum clamping voltage of 1.5KE18CA under surge conditions?
The 1.5KE18CA clamps to a maximum of 25.2 V at its rated peak pulse current of 59.5 A (10/1000 µs waveform), as specified in Vishay document 88301. This value represents worst-case voltage seen by downstream circuitry during surge events and must be compared against the absolute maximum ratings of protected ICs to ensure safe operation.
1.5KE18CA/54 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 15.3V
- Voltage - Breakdown (Min):
- 17.1V
- Voltage - Clamping (Max) @ Ipp:
- 25.2V
- Current - Peak Pulse (10/1000µs):
- 59.5A
- 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
1.5KE18CA/54 FAQ
1.How can I place an order for 1.5KE18CA/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE18CA/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 1.5KE18CA/54 reliable?
The price and inventory of 1.5KE18CA/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE18CA/54 is usually 5 days.
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Once your 1.5KE18CA/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.
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For technical support, including 1.5KE18CA/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE18CA/54 requirements.
6.How does Aetrix verify that 1.5KE18CA/54 is sourced from the original manufacturer or authorized distributors?
All 1.5KE18CA/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 1.5KE18CA/54 meets industry standards.
7.What is the process for return or replacement of 1.5KE18CA/54?
All 1.5KE18CA/54 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE18CA/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 1.5KE18CA/54 part is unused and in its original packaging.
Return procedure for 1.5KE18CA/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE18CA/54 Tags
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