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Vishay General Semiconductor - Diodes Division 1.5KE18CAHE3/51
- Part No.:
- 1.5KE18CAHE3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE18CAHE3/51.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:4,157
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Product details
Overview
1.5KE18CAHE3/51 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 1500 W peak pulse power rating (10/1000 µs), 17.1–18.9 V breakdown voltage (VBR) at 1 mA, 15.3 V maximum stand-off voltage (VWM), and clamps transients to ≤25.2 V at 59.5 A peak pulse current - deployed in automotive sensor interfaces, industrial I/O protection, and telecom line surge suppression.
For engineers reviewing the 1.5KE18CAHE3/51 datasheet, 1.5KE18CAHE3/51 pinout, 1.5KE18CAHE3/51 application, or 1.5KE18CAHE3/51 equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), JEDEC 1.5KE package dimensions, and design-meaningful clamping behavior for fast transient immunity validation.
Technical Context
This bi-directional TVS operates symmetrically in both polarities with identical VBR, VWM, and clamping characteristics - eliminating polarity marking requirements and enabling direct placement across AC-coupled or floating signal paths. Its glass-passivated junction ensures stable leakage (<1 µA at VWM) and low incremental surge resistance for consistent clamping under repetitive surges.
The device uses a 10/1000 µs waveform test condition per REA standards, delivering 1500 W pulse power capability at TA = 25 °C, derated linearly above 25 °C per Fig. 2, with maximum junction temperature of +175 °C and thermal resistance from junction-to-lead of 15.4 °C/W - supporting high-reliability mounting on PCBs with minimal copper area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 17.1 V / 18.9 V at 1 mA - defines reliable conduction onset threshold for bidirectional surge clamping |
| VWM | 15.3 V - maximum continuous reverse voltage before leakage exceeds 1 µA; sets safe operating margin below VBR |
| VC @ IPPM | 25.2 V at 59.5 A - clamped voltage during full 1500 W transient, limiting downstream IC stress |
| PPPM | 1500 W (10/1000 µs) - peak surge energy handling capacity for lightning and ESD-like events |
| TJ max. | +175 °C - enables operation in under-hood automotive and industrial environments without thermal shutdown |
| RθJA | 75 °C/W - quantifies self-heating under sustained power dissipation; informs heatsinking needs for repeated pulses |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
Pinout & Package
Package: JEDEC Case Style 1.5KE - molded epoxy body (UL 94 V-0), matte tin-plated leads, 0.375" (9.5 mm) lead length, 0.210" × 0.285" body footprint. RoHS-compliant and qualified to JESD 201 Class 2 whisker resistance (HE3 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (bi-directional) | Transient current path | No polarity marking; symmetrical conduction allows placement across any two-point voltage differential without orientation check |
| Leads (2) | Thermal and electrical interface | Provide primary heat transfer path to PCB; RθJL = 15.4 °C/W enables effective junction cooling via copper pour |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance (±5%) and <1 µA leakage at VWM across -55 °C to +175 °C |
| 1500 W peak pulse power (10/1000 µs) | Withstands IEC 61000-4-5 Level 4 surges (4 kV, 2 Ω source) without degradation |
| Bi-directional symmetry | Identical VBR, VC, and IPPM in both directions - eliminates need for polarity-aware layout or BOM variants |
| AEC-Q101 qualification | Validated for automotive applications including engine control units, ADAS sensors, and infotainment power rails |
| Low clamping ratio (VC/VBR ≈ 1.44) | Minimizes voltage overshoot during fast transients, protecting 24 V-rated logic and analog front-ends |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bi-directional clamping element placed directly at connector entry point to shunt surge energy before it reaches protected ICs. Use Value: Clamps 10/1000 µs transients to ≤25.2 V while maintaining <1 µA leakage at 15.3 V - preserving signal integrity and preventing false triggers in 12 V/24 V systems. |
Use Scenario: Safeguarding digital input modules against induced surges from relay coil switching and motor drive noise in factory automation cabinets. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V DC input lines, mounted adjacent to terminal block for shortest possible transient path. Use Value: 1500 W pulse rating handles repetitive 100 A inductive kick events; AEC-Q101 qualification ensures long-term reliability in vibration-prone control panels. |
| Telecom Line Interface | Consumer Power Adapter Input |
Use Scenario: Secondary surge protection on POTS or DSL line interfaces exposed to lightning-induced common-mode transients. IC Role / Device Role / Timing Role: Bidirectional suppressor bridging tip/ring or differential pair, coordinated with gas discharge tube (GDT) primary stage. Use Value: Sub-nanosecond response time clamps transients before GDT fires; symmetrical VC prevents DC bias shift in balanced signaling. |
Use Scenario: Input-stage transient suppression on AC-DC adapter primary side (across bridge rectifier output or bulk capacitor). IC Role / Device Role / Timing Role: Fast-acting clamp limiting voltage spikes from mains switching transients and capacitor inrush. Use Value: 175 °C max junction temperature supports operation near hot transformers; UL 94 V-0 molding compound meets safety isolation 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 |
|---|---|---|---|
| SMBJ18CA | Lower peak power (600 W), smaller SMB package (RθJA = 110 °C/W), same VBR range and bi-directionality | Better suited for space-constrained consumer electronics; insufficient for automotive load dump per ISO 16750-2 | Select when board area is critical and surge energy is limited to IEC 61000-4-5 Level 2 (1 kV) |
| 1.5KE18AHE3/51 | Uni-directional variant - includes cathode band marking, forward voltage drop (~3.5 V), no reverse conduction | Required only where DC-biased unidirectional lines (e.g., 5 V supply rail) demand asymmetric clamping | Choose only if circuit topology mandates polarity-specific protection; otherwise 1.5KE18CAHE3/51 offers broader flexibility |
Compared with SMBJ18CA and 1.5KE18AHE3/51, the 1.5KE18CAHE3/51 uniquely combines automotive-grade 1500 W surge handling, bi-directional symmetry, and AEC-Q101 qualification - making it the preferred choice for high-energy, polarity-agnostic protection in harsh environments without requiring layout redesign or additional components.
Availability
1.5KE18CAHE3/51 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line interfaces, and consumer power adapter designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for 1.5KE18CAHE3/51 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, efficiency, and application-specific performance.
The 1.5KE series was engineered for high-energy transient suppression in automotive, industrial, and telecom infrastructure - prioritizing ruggedness, repeatable clamping, and qualification to AEC-Q101 and UL 497B standards.
FAQ
What is the breakdown voltage tolerance for 1.5KE18CAHE3/51?
The 1.5KE18CAHE3/51 has a guaranteed breakdown voltage (VBR) range of 17.1 V to 18.9 V at 1 mA test current, representing a ±5% tolerance around the nominal 18 V rating. This tight tolerance ensures predictable clamping onset across production lots and temperature extremes from -55 °C to +175 °C, critical for consistent protection in automotive and industrial applications.
Is 1.5KE18CAHE3/51 suitable for automotive applications?
Yes, the 1.5KE18CAHE3/51 is AEC-Q101 qualified and explicitly rated for automotive use per Vishay documentation. It meets requirements for temperature cycling, high-temperature reverse bias (HTRB), and mechanical shock - making it appropriate for engine control units, ADAS camera modules, and body electronics where load dump and ISO 7637-2 pulse immunity are mandatory.
How does the clamping voltage of 1.5KE18CAHE3/51 compare to its breakdown voltage?
The 1.5KE18CAHE3/51 clamps transients to a maximum of 25.2 V at its rated peak pulse current of 59.5 A, yielding a clamping ratio (VC/VBR) of approximately 1.44. This low ratio reflects efficient energy absorption and minimal voltage overshoot - essential for protecting 24 V-rated ICs that cannot tolerate excursions beyond 28 V.
What is the thermal resistance of 1.5KE18CAHE3/51, and how does it affect layout?
The 1.5KE18CAHE3/51 has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead resistance (RθJL) of 15.4 °C/W. To maintain safe junction temperatures during repetitive surges, PCB layout must provide ≥1 cm² of 2-oz copper connected to both leads - leveraging the leads as primary thermal pathways rather than relying solely on ambient convection.
Does 1.5KE18CAHE3/51 require polarity-aware placement on the PCB?
No, the 1.5KE18CAHE3/51 is a bi-directional TVS diode with identical electrical characteristics in both directions - there is no cathode band or polarity marking. It can be placed across any two-point voltage differential without orientation constraints, simplifying assembly and reducing BOM complexity compared to uni-directional variants like 1.5KE18AHE3/51.
1.5KE18CAHE3/51 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):
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 1.5KE
1.5KE18CAHE3/51 FAQ
1.How can I place an order for 1.5KE18CAHE3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE18CAHE3/51 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 1.5KE18CAHE3/51 reliable?
The price and inventory of 1.5KE18CAHE3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE18CAHE3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KE18CAHE3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE18CAHE3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE18CAHE3/51?
1.5KE18CAHE3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE18CAHE3/51 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 1.5KE18CAHE3/51?
For technical support, including 1.5KE18CAHE3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE18CAHE3/51 requirements.
6.How does Aetrix verify that 1.5KE18CAHE3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KE18CAHE3/51 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 1.5KE18CAHE3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KE18CAHE3/51?
All 1.5KE18CAHE3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE18CAHE3/51, 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 1.5KE18CAHE3/51 part is unused and in its original packaging.
Return procedure for 1.5KE18CAHE3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE18CAHE3/51 Tags
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