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Vishay General Semiconductor - Diodes Division 1.5KE18HE3/54
- Part No.:
- 1.5KE18HE3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE18HE3/54.pdf
- Description:
- TVS DIODE 14.5VWM 26.5VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:4,681
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Product details
Overview
1.5KE18HE3/54 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 18 V breakdown voltage (VBR = 17.1–18.9 V at IT = 1.0 mA), 15.3 V maximum working peak reverse voltage (VWM), 25.2 V clamping voltage (VC) at 59.5 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform - used to safeguard MOSFETs, ICs, and sensor interfaces against lightning-induced surges and inductive switching transients.
For engineers reviewing the 1.5KE18HE3/54 datasheet, 1.5KE18HE3/54 pinout, 1.5KE18HE3/54 application, or 1.5KE18HE3/54 equivalent, this part delivers verified AEC-Q101 qualification, RoHS-compliant matte tin-plated leads, JESD 201 Class 2 whisker resistance, and UL 94 V-0 molded epoxy packaging - critical for automotive, industrial, and telecom surge protection design-in.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: when transient voltage exceeds VBR, it avalanches into low-impedance conduction within <1 ns, diverting surge current away from downstream circuitry. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance.
It is rated for 200 A non-repetitive forward surge current (IFSM) and supports continuous power dissipation of 6.5 W on an infinite heatsink at TL = 75 °C. Thermal resistance is 15.4 °C/W junction-to-lead, enabling effective heat transfer through PCB copper pours or lead-frame mounting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 17.1 V / 18.9 V at 1.0 mA test current - defines precise avalanche initiation threshold for reliable overvoltage triggering |
| VWM | 15.3 V maximum - ensures no conduction during normal 12 V–15 V DC rail operation |
| VC @ IPPM | 25.2 V at 59.5 A - clamps transient to safe level for 3.3 V/5 V logic and MOSFET gate drivers |
| PPPM | 1500 W with 10/1000 µs waveform - handles high-energy surges from motor commutation or EFT bursts |
| IFSM | 200 A (8.3 ms half-sine) - withstands repetitive inrush or fault currents without degradation |
| TJ range | −55 °C to +175 °C - supports under-hood automotive and industrial ambient environments |
| Package | Case Style 1.5KE (DO-201AD) - axial-leaded, 0.375" lead length, UL 94 V-0 compliant epoxy body |
Pinout & Package
1.5KE18HE3/54 uses the standard DO-201AD axial package (Case Style 1.5KE), with cathode indicated by a color band on one end. Leads are matte tin-plated, solderable per J-STD-002 and JESD 22-B102, and qualified to JESD 201 Class 2 for whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during reverse-biased clamping | Connected to protected line (e.g., VIN or signal); must be routed with low-inductance path to ground |
| Cathode | Current exit point during clamping; marked with band | Connected to system ground or low-impedance return plane - determines polarity-sensitive placement |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance (±5%) and long-term reliability under thermal cycling |
| AEC-Q101 qualification | Validated for automotive-grade stress testing including HTOL, temperature cycling, and HTRB |
| 1500 W peak pulse power | Supports IEC 61000-4-5 Level 4 (4 kV/2 Ω) surge immunity without external series impedance |
| Sub-nanosecond response time | Clamps transients before sensitive ICs experience overstress - faster than MOVs or GDTs |
| UL 94 V-0 epoxy molding | Provides flame-retardant mechanical encapsulation suitable for enclosed industrial enclosures |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12 V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Shunt clamping device placed between VBAT and chassis ground, triggered within 1 ns upon overvoltage detection. Use Value: Limits transient voltage to ≤25.2 V, protecting 36 V-rated DC-DC controllers and CAN transceivers without derating. |
Use Scenario: 4–20 mA current loop sensors in factory automation subject to ESD and cable discharge events. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS placed across loop terminals to clamp both positive and negative transients. Use Value: Maintains loop integrity below 15.3 V standoff while clamping ±25.2 V surges - preserving analog accuracy and avoiding false triggers. |
| Telecom Line Surge Protection | Consumer Power Adapter Input Stage |
Use Scenario: DSL or PoE-powered equipment connected to outdoor copper lines vulnerable to induced lightning. IC Role / Device Role / Timing Role: Primary front-end protector on AC/DC input stage, coordinated with MOV and gas discharge tube. Use Value: Fast clamping action (<1 ns) supplements slower protectors, reducing let-through energy to downstream bridge rectifiers and bulk capacitors. |
Use Scenario: Secondary-side 5 V/3.3 V DC output rails in wall adapters subjected to conducted EFT (IEC 61000-4-4). IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF) shunt suppressor placed directly at regulator input pins. Use Value: Prevents latch-up in LDOs and buck converters by limiting transient overshoot to 25.2 V - well below absolute maximum ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A | DO-214AA package (SMB), 600 W PPPM, lower IPPM (32.4 A), same VBR range (17.1–18.9 V) | Surface-mount only; unsuitable for high-power axial designs or legacy through-hole layouts | Select SMBJ18A only when board space is constrained and peak surge energy is ≤600 W. |
| 1.5KE18A-E3/54 | Same 1.5KE package and electrical specs, but commercial-grade (non-AEC-Q101), JESD 201 Class 1A whisker rating | Lacks automotive qualification; not approved for under-hood or safety-critical modules | Choose 1.5KE18A-E3/54 for cost-sensitive consumer or industrial applications where AEC-Q101 is not mandated. |
Compared with SMBJ18A and 1.5KE18A-E3/54, the 1.5KE18HE3/54 uniquely combines 1500 W surge capability, AEC-Q101 qualification, and axial DO-201AD form factor - making it the only option for high-energy automotive front-end protection requiring through-hole robustness and automotive traceability.
Availability
1.5KE18HE3/54 is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and telecom infrastructure requiring stable component supply with full AEC-Q101 compliance and RoHS traceability.
Supply support for 1.5KE18HE3/54 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 high-reliability diodes, MOSFETs, and passive components for demanding industrial and automotive applications.
The 1.5KE family was engineered specifically for high-energy transient suppression in harsh environments, emphasizing robustness, repeatable clamping, and qualification to automotive and industrial reliability standards.
FAQ
What is the exact breakdown voltage range for 1.5KE18HE3/54?
The 1.5KE18HE3/54 has a guaranteed breakdown voltage (VBR) range of 17.1 V to 18.9 V at a test current of 1.0 mA, measured per JEDEC standard. This tight tolerance ensures consistent clamping behavior across production lots and supports precise overvoltage margining in 12 V systems. The value is confirmed in Vishay's official datasheet document 88301, revision 09-Aug-2022.
Is 1.5KE18HE3/54 suitable for automotive applications?
Yes, 1.5KE18HE3/54 is AEC-Q101 qualified and explicitly listed in Vishay's documentation as meeting automotive stress requirements. Its HE3 suffix denotes RoHS compliance and AEC-Q101 qualification, validated for temperature cycling, high-temperature operating life, and humidity testing. Engineers deploying 1.5KE18HE3/54 in engine control units or ADAS modules can rely on its certified performance.
What is the clamping voltage of 1.5KE18HE3/54 at its rated peak pulse current?
The 1.5KE18HE3/54 clamps to a maximum of 25.2 V at its rated peak pulse current of 59.5 A (10/1000 µs waveform). This value is measured under standardized conditions and defines the upper voltage limit imposed on protected circuitry during surge events. It enables safe interfacing with 24 V-rated ICs and ensures compatibility with common industrial I/O voltage thresholds.
Does 1.5KE18HE3/54 have a bidirectional variant?
No, 1.5KE18HE3/54 is strictly unidirectional. Bidirectional variants in the 1.5KE family use the "CA" suffix (e.g., 1.5KE18CA), and the datasheet confirms bidirectional types are only available from 1.5KE6.8CA to 1.5KE220CA. Since 1.5KE18HE3/54 carries the "A" suffix and no "C", it is unidirectional with cathode marking - essential for correct polarity-dependent placement in DC circuits.
What package type does 1.5KE18HE3/54 use, and what are its key mechanical properties?
1.5KE18HE3/54 uses the DO-201AD (Case Style 1.5KE) axial package: molded epoxy body meeting UL 94 V-0 flammability rating, 0.375" (9.5 mm) lead length, and matte tin-plated leads compliant with J-STD-002. Its thermal resistance is 15.4 °C/W junction-to-lead, supporting direct heat sinking via PCB copper or chassis contact - a critical advantage over SMD alternatives in high-power surge scenarios.
1.5KE18HE3/54 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 14.5V
- Voltage - Breakdown (Min):
- 16.2V
- Voltage - Clamping (Max) @ Ipp:
- 26.5V
- Current - Peak Pulse (10/1000µs):
- 56.6A
- 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
1.5KE18HE3/54 FAQ
1.How can I place an order for 1.5KE18HE3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE18HE3/54 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 1.5KE18HE3/54 reliable?
The price and inventory of 1.5KE18HE3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE18HE3/54 is usually 5 days.
3.What payment methods are accepted for 1.5KE18HE3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE18HE3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE18HE3/54?
1.5KE18HE3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE18HE3/54 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 1.5KE18HE3/54?
For technical support, including 1.5KE18HE3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE18HE3/54 requirements.
6.How does Aetrix verify that 1.5KE18HE3/54 is sourced from the original manufacturer or authorized distributors?
All 1.5KE18HE3/54 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 1.5KE18HE3/54 meets industry standards.
7.What is the process for return or replacement of 1.5KE18HE3/54?
All 1.5KE18HE3/54 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE18HE3/54, 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 1.5KE18HE3/54 part is unused and in its original packaging.
Return procedure for 1.5KE18HE3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE18HE3/54 Tags
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