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Home > Products > Circuit Protection > Transient Voltage Suppressors (TVS) > TVS Diodes

Vishay General Semiconductor - Diodes Division 1.5KA18HE3/73

Name: 1.5KA18HE3/73
Brand: Vishay General Semiconductor - Diodes Division
SKU: 1.5KA18HE3/73
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1.5KA18HE3/73

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

Package:: DO-201AA, DO-27, Axial

Datasheet:: 1.5KA18HE3/73.pdf

Description:: TVS DIODE 14.5VWM 26.5VC 1.5KA

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Product details

Overview

1.5KA18HE3/73 from Vishay General Semiconductor is a unidirectional automotive-grade transient voltage suppressor (TVS) diode designed for high-energy surge clamping in power and signal lines. It features 18 V breakdown voltage (V_BR = 16.2–19.8 V), 1500 W peak pulse power (10/1000 µs), 26.5 V max clamping voltage at 56.6 A, 185 °C max junction temperature, and AEC-Q101 qualification for under-hood automotive electronics.

For engineers reviewing the 1.5KA18HE3/73 datasheet, 1.5KA18HE3/73 pinout, 1.5KA18HE3/73 application, or 1.5KA18HE3/73 equivalent, key selection criteria include clamping performance under 10/1000 µs transients, thermal stability up to 185 °C, RoHS-compliant HE3 packaging with JESD201 Class 2 whisker resistance, and unidirectional polarity for DC-biased protection circuits.

Technical Context

This TVS diode operates as a voltage-clamped shunt protector, leveraging patented PAR® construction to achieve low incremental surge resistance and fast response time (<1 ns). Its unidirectional configuration enables integration into DC power rails and signal paths where reverse conduction must be blocked during normal operation.

The device is rated for 1500 W peak pulse power per 10/1000 µs waveform, supports 200 A non-repetitive forward surge current (8.3 ms half-sine), and maintains stable V_BR with +0.088 %/°C temperature coefficient - critical for consistent clamping across automotive temperature ranges (−65 °C to +185 °C).

Key Specifications

Parameter	Value and Actual Design Meaning
V_BR (min/max)	16.2 V / 19.8 V - ensures reliable turn-on above 18 V nominal system voltage while accommodating manufacturing tolerance
V_C @ I_PPM	26.5 V - clamps induced transients below IC damage thresholds in 12 V automotive systems
P_PPM	1500 W - handles ISO 7637-2 Pulse 1, 2a, 3a/b, and ISO 16750-2 load dump surges
T_J max	+185 °C - supports under-hood placement near engines without derating loss
I_FSM	200 A - withstands repetitive inductive switching events in motor control and relay drivers
V_WM	14.5 V - provides 20 % margin above 12 V nominal rail, blocking leakage below clamping threshold
Package	Case Style 1.5KA - axial-leaded, epoxy-molded, UL 94 V-0 compliant package with matte tin leads

Pinout & Package

Case Style 1.5KA is an axial-leaded, through-hole package with cathode indicated by color band. Leads are matte tin-plated, solderable per J-STD-002 and JESD22-B102, and qualified to JESD201 Class 2 for whisker resistance.

Pin/Terminal	Circuit Role	Design Meaning
Anode	DC return path / surge current sink	Connected to ground or low-impedance return; carries full transient current during clamping
Cathode	Protected line input / voltage reference node	Connected to line being protected (e.g., battery rail); defines clamping voltage relative to anode

Key Features

Feature	Design Value
Patented PAR® construction	Reduces incremental surge resistance for tighter clamping and lower let-through energy
AEC-Q101 qualification	Validated for automotive under-hood use including temperature cycling, humidity, and mechanical shock
1500 W peak pulse rating (10/1000 µs)	Meets ISO 7637-2 and ISO 16750-2 transient immunity requirements for 12 V systems
RoHS-compliant HE3 suffix	Ensures lead-free assembly compatibility and JESD201 Class 2 whisker resistance for long-term reliability
185 °C maximum junction temperature	Enables direct mounting on hot PCB areas without thermal derating penalties

Applications

Automotive Power Rail Protection	Industrial Sensor Signal Line Protection
Use Scenario: Protecting 12 V battery-fed ECUs, body controllers, and lighting modules from load dump and inductive switching transients. IC Role / Device Role / Timing Role: Shunt-type transient voltage suppressor placed between power rail and ground, activated within nanoseconds of overvoltage event. Use Value: Clamps transients to ≤26.5 V, preventing damage to downstream 30 V-rated MOSFETs and microcontrollers.	Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) in factory automation against ESD and cable discharge events. IC Role / Device Role / Timing Role: Unidirectional TVS placed at connector interface to absorb ±8 kV contact ESD per IEC 61000-4-2 without affecting DC bias. Use Value: Limits voltage excursion to <30 V during 10/1000 µs surges, preserving ADC input integrity and avoiding latch-up.
Telecom DC Power Feeds	Consumer Appliance Motor Control
Use Scenario: Securing −48 V telecom power distribution boards against lightning-induced surges on outdoor feeder lines. IC Role / Device Role / Timing Role: Reverse-polarity configured TVS (cathode to −48 V rail) to clamp positive transients toward ground. Use Value: Withstands 1500 W pulses while maintaining <26.5 V clamping, protecting PoE controllers and DC-DC converters.	Use Scenario: Shielding BLDC motor driver gate drivers and current sense amplifiers from commutation spikes in washing machines and HVAC fans. IC Role / Device Role / Timing Role: Mounted across H-bridge supply rails to clamp inductive kickback during PWM switching transitions. Use Value: Fast response and low V_C prevent false triggering of overvoltage protection and extend MOSFET lifetime.

Automotive Power Rail Protection

Industrial Sensor Signal Line Protection

Use Scenario: Protecting 12 V battery-fed ECUs, body controllers, and lighting modules from load dump and inductive switching transients.

IC Role / Device Role / Timing Role: Shunt-type transient voltage suppressor placed between power rail and ground, activated within nanoseconds of overvoltage event.

Use Value: Clamps transients to ≤26.5 V, preventing damage to downstream 30 V-rated MOSFETs and microcontrollers.

Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) in factory automation against ESD and cable discharge events.

IC Role / Device Role / Timing Role: Unidirectional TVS placed at connector interface to absorb ±8 kV contact ESD per IEC 61000-4-2 without affecting DC bias.

Use Value: Limits voltage excursion to <30 V during 10/1000 µs surges, preserving ADC input integrity and avoiding latch-up.

Telecom DC Power Feeds

Consumer Appliance Motor Control

Use Scenario: Securing −48 V telecom power distribution boards against lightning-induced surges on outdoor feeder lines.

IC Role / Device Role / Timing Role: Reverse-polarity configured TVS (cathode to −48 V rail) to clamp positive transients toward ground.

Use Value: Withstands 1500 W pulses while maintaining <26.5 V clamping, protecting PoE controllers and DC-DC converters.

Use Scenario: Shielding BLDC motor driver gate drivers and current sense amplifiers from commutation spikes in washing machines and HVAC fans.

IC Role / Device Role / Timing Role: Mounted across H-bridge supply rails to clamp inductive kickback during PWM switching transitions.

Use Value: Fast response and low V_C prevent false triggering of overvoltage protection and extend MOSFET lifetime.

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient suppression applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMBJ18A-E3/52	Surface-mount SMB package; 18 V bidirectional; 600 W P_PPM; lower I_PPM (32.4 A)	Limited to board-level protection where space constraints preclude axial leads; not AEC-Q101 qualified	Select when automated SMT assembly is required and surge energy is ≤600 W
1.5KE18A	Same 1.5 kW rating and 18 V V_BR, but legacy DO-201 package; no HE3 whisker qualification; TJ max = 175 °C	Acceptable for industrial non-automotive use; lacks AEC-Q101 validation and high-temp reliability margin	Select only for cost-sensitive non-automotive designs with ambient <150 °C

Compared with 1.5KA18HE3/73, SMBJ18A-E3/52 offers smaller footprint but reduced surge handling and no automotive qualification, while 1.5KE18A matches power rating but lacks high-temperature capability and whisker-resistant plating - making 1.5KA18HE3/73 the sole choice for AEC-Q101-compliant, high-thermal-margin designs.

Availability

1.5KA18HE3/73 is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, telecom power feeds, and consumer appliance motor control requiring stable component supply across extended temperature and surge stress conditions.

Supply support for 1.5KA18HE3/73 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, TVS devices, and optoelectronics with emphasis on reliability and automotive qualification.

The 1.5KA series was engineered specifically for AEC-Q101-compliant transient suppression in harsh automotive environments, combining high-temperature silicon design, robust PAR® packaging, and stringent process controls for under-hood deployment.

FAQ

What is the clamping voltage of the 1.5KA18HE3/73 under maximum rated surge current?

The 1.5KA18HE3/73 exhibits a maximum clamping voltage (V_C) of 26.5 V when subjected to its peak pulse current (I_PPM) of 56.6 A using the standard 10/1000 µs waveform. This value is measured at T_A = 25 °C and guarantees that protected circuitry remains below critical overvoltage thresholds during surge events. The 1.5KA18HE3/73 maintains this clamping performance across its full operating temperature range due to its low V_BR temperature coefficient of +0.088 %/°C.

Is the 1.5KA18HE3/73 suitable for automotive applications?

Yes, the 1.5KA18HE3/73 is explicitly qualified to AEC-Q101 standards for automotive use, with a maximum junction temperature rating of +185 °C and construction validated for thermal cycling, mechanical shock, and humidity exposure. Its HE3 suffix confirms RoHS compliance and JESD201 Class 2 whisker resistance - essential for long-term reliability in engine control units, body electronics, and ADAS modules. The 1.5KA18HE3/73 meets ISO 7637-2 and ISO 16750-2 transient immunity requirements for 12 V vehicle systems.

What does the "HE3" suffix indicate on the 1.5KA18HE3/73 part number?

The "HE3" suffix on the 1.5KA18HE3/73 denotes a high-reliability, automotive-grade variant compliant with RoHS Directive 2002/95/EC and qualified to JESD201 Class 2 for tin whisker resistance. It specifies matte tin-plated leads meeting J-STD-002 and JESD22-B102 solderability standards, and indicates full AEC-Q101 qualification. The 1.5KA18HE3/73 HE3 version is distinct from commercial-grade variants and is intended for mission-critical automotive and industrial deployments.

How does the 1.5KA18HE3/73 differ from the 1.5KA18A variant?

The 1.5KA18HE3/73 and 1.5KA18A share identical electrical characteristics - including V_BR (16.2–19.8 V), V_C (26.5 V), and P_PPM (1500 W) - but differ in packaging and qualification. The 1.5KA18HE3/73 uses the HE3 suffix denoting AEC-Q101 qualification, JESD201 Class 2 whisker resistance, and RoHS compliance, whereas 1.5KA18A is a standard commercial variant without automotive validation. Both use Case Style 1.5KA, but only the 1.5KA18HE3/73 is approved for under-hood automotive use.

What is the standoff voltage (V_WM) of the 1.5KA18HE3/73, and why is it important?

The standoff voltage (V_WM) of the 1.5KA18HE3/73 is 14.5 V - the maximum continuous reverse voltage it can block without significant leakage. This parameter ensures the 1.5KA18HE3/73 remains non-conductive during normal 12 V system operation while providing a 20 % safety margin above nominal rail voltage. At V_WM, reverse leakage is limited to 1 µA at 25 °C and 10 µA at 150 °C, preventing power loss or false triggering in always-on automotive modules.

1.5KA18HE3/73 Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

Package/Case:: DO-201AA, DO-27, Axial

Series:: PAR®

Packaging:: Tape & Box (TB)

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:: -65°C ~ 185°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Through Hole

Supplier Device Package:: 1.5KA

1.5KA18HE3/73 FAQ

1.How can I place an order for 1.5KA18HE3/73 through Aetrix?

Please submit a Request for Quotation (RFQ) for 1.5KA18HE3/73 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 1.5KA18HE3/73 reliable?

The price and inventory of 1.5KA18HE3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KA18HE3/73 is usually 5 days.

3.What payment methods are accepted for 1.5KA18HE3/73?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KA18HE3/73 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1.5KA18HE3/73?

1.5KA18HE3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1.5KA18HE3/73 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 1.5KA18HE3/73?

For technical support, including 1.5KA18HE3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KA18HE3/73 requirements.

6.How does Aetrix verify that 1.5KA18HE3/73 is sourced from the original manufacturer or authorized distributors?

All 1.5KA18HE3/73 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 1.5KA18HE3/73 meets industry standards.

7.What is the process for return or replacement of 1.5KA18HE3/73?

All 1.5KA18HE3/73 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KA18HE3/73, 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 1.5KA18HE3/73 part is unused and in its original packaging.

Return procedure for 1.5KA18HE3/73:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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