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

Vishay General Semiconductor - Diodes Division 1.5KA27HE3/51

Name: 1.5KA27HE3/51
Brand: Vishay General Semiconductor - Diodes Division
SKU: 1.5KA27HE3/51
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1.5KA27HE3/51

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

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

Datasheet:: 1.5KA27HE3/51.pdf

Description:: TVS DIODE 21.8VWM 39.1VC 1.5KA

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Product details

Overview

1.5KA27HE3/51 from Vishay General Semiconductor is a unidirectional automotive-grade transient voltage suppressor (TVS) diode designed for high-energy surge protection in harsh environments. It features a 24.3 V to 29.7 V breakdown voltage (V_BR), 1500 W peak pulse power (10/1000 µs), 39.1 V clamping voltage at 38.4 A, and AEC-Q101 qualification for under-hood automotive electronics.

For engineers reviewing the 1.5KA27HE3/51 datasheet, 1.5KA27HE3/51 pinout, 1.5KA27HE3/51 application, or 1.5KA27HE3/51 equivalent, key selection criteria include clamping performance under 10/1000 µs transients, junction temperature capability up to +185 °C, RoHS-compliant HE3 packaging, and compatibility with inductive load switching protection in automotive powertrain and body control modules.

Technical Context

This TVS diode uses Vishay's patented PAR® construction for stable clamping under repeated surge stress and operates exclusively in unidirectional polarity. Its low incremental surge resistance and fast response time ensure effective suppression of ESD and load-dump transients without compromising signal integrity on protected lines.

The device is rated for 200 A non-repetitive forward surge current (8.3 ms half-sine), maintains <1 µA leakage at 21.8 V stand-off voltage, and exhibits a +0.096 %/°C temperature coefficient of V_BR, enabling predictable voltage threshold behavior across its -65 °C to +185 °C operating range.

Key Specifications

Parameter	Value and Actual Design Meaning
V_BR (min/max)	24.3 V / 29.7 V - defines reliable conduction onset window under surge conditions
P_PPM	1500 W - maximum single-pulse energy absorption capability with 10/1000 µs waveform
V_C @ I_PPM	39.1 V - clamping voltage limiting downstream circuit stress during full-rated surge current
I_PPM	38.4 A - peak pulse current corresponding to 1500 W at 39.1 V clamping
T_J max.	+185 °C - enables operation in high-temperature automotive locations such as engine compartments
V_WM	21.8 V - maximum continuous reverse working voltage before significant leakage begins
Temp. Coeff. V_BR	+0.096 %/°C - quantifies V_BR drift over temperature for precision system margining

Pinout & Package

Package: Case Style 1.5KA - molded epoxy body with matte tin-plated leads, UL 94 V-0 rated, AEC-Q101 qualified, HE3 suffix indicating JESD201 Class 2 whisker resistance and automotive reliability grading.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to ground or lower-potential rail in unidirectional TVS configuration
Cathode	Reverse-biased clamping terminal	Marked by color band; connected to protected line to shunt transients to ground

Key Features

Feature	Design Value
Patented PAR® construction	Enables consistent clamping performance and long-term reliability under repetitive surge stress
1500 W peak pulse power (10/1000 µs)	Meets ISO 7637-2 Pulse 5a/b (load dump) requirements for 12 V automotive systems
AEC-Q101 qualification	Validates suitability for automotive powertrain, chassis, and body electronics per stress test standards
Low incremental surge resistance	Minimizes voltage overshoot during fast-rising transients (<1 ns response time implied)
RoHS-compliant HE3 packaging	Supports lead-free reflow assembly and meets J-STD-002/JESD22-B102 solderability standards

Applications

Engine Control Unit (ECU) Power Input Protection	Automotive Body Control Module (BCM) CAN Bus Lines
Use Scenario: Protecting 12 V supply rails in engine control units against ISO 7637-2 load dump transients up to 60 V. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery input and DC/DC converter input stage. Use Value: Limits transient voltage to ≤39.1 V, preventing damage to downstream LDOs and microcontrollers rated for 40 V absolute maximum.	Use Scenario: Safeguarding low-voltage CAN H/L differential pairs from coupled ESD and inductive switching noise. IC Role / Device Role / Timing Role: Discrete TVS pair (one per line) referenced to chassis ground near connector interface. Use Value: Clamps common-mode surges while maintaining <10 pF junction capacitance to preserve CAN signal integrity up to 1 Mbps.
Automotive Lighting Driver Output Stage	Start-Stop System Battery Monitoring Circuit
Use Scenario: Shielding MOSFET gate drivers and current sense amplifiers in LED headlamp modules from inductive kickback. IC Role / Device Role / Timing Role: TVS placed across motor/driver output terminals to absorb flyback energy. Use Value: Absorbs 1500 W pulses without degradation, ensuring driver IC survival during frequent PWM switching cycles.	Use Scenario: Protecting precision voltage dividers and ADC inputs monitoring 12 V battery health during cold-cranking events. IC Role / Device Role / Timing Role: TVS placed at ADC input filter node to prevent overvoltage saturation during cranking dips and spikes. Use Value: Maintains <1 µA leakage at 21.8 V, avoiding measurement error in sub-1% battery voltage sensing accuracy.

Engine Control Unit (ECU) Power Input Protection

Automotive Body Control Module (BCM) CAN Bus Lines

Use Scenario: Protecting 12 V supply rails in engine control units against ISO 7637-2 load dump transients up to 60 V.

IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery input and DC/DC converter input stage.

Use Value: Limits transient voltage to ≤39.1 V, preventing damage to downstream LDOs and microcontrollers rated for 40 V absolute maximum.

Use Scenario: Safeguarding low-voltage CAN H/L differential pairs from coupled ESD and inductive switching noise.

IC Role / Device Role / Timing Role: Discrete TVS pair (one per line) referenced to chassis ground near connector interface.

Use Value: Clamps common-mode surges while maintaining <10 pF junction capacitance to preserve CAN signal integrity up to 1 Mbps.

Automotive Lighting Driver Output Stage

Start-Stop System Battery Monitoring Circuit

Use Scenario: Shielding MOSFET gate drivers and current sense amplifiers in LED headlamp modules from inductive kickback.

IC Role / Device Role / Timing Role: TVS placed across motor/driver output terminals to absorb flyback energy.

Use Value: Absorbs 1500 W pulses without degradation, ensuring driver IC survival during frequent PWM switching cycles.

Use Scenario: Protecting precision voltage dividers and ADC inputs monitoring 12 V battery health during cold-cranking events.

IC Role / Device Role / Timing Role: TVS placed at ADC input filter node to prevent overvoltage saturation during cranking dips and spikes.

Use Value: Maintains <1 µA leakage at 21.8 V, avoiding measurement error in sub-1% battery voltage sensing accuracy.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMBJ28A-E3/52	Lower P_PPM (600 W), tighter V_BR tolerance (26.6–29.4 V), same 1.5 kW-class SMB package footprint	Not AEC-Q101 qualified; intended for industrial/commercial use only	Select when automotive qualification is not required and lower surge energy suffices
1.5KE27A	Same V_BR range but TO-204AA (DO-4) package; no HE3 reliability grading; higher thermal resistance	Lacks AEC-Q101 and JESD201 whisker compliance; limited to non-automotive PCBs	Choose only for legacy designs where 1.5KA case style is unavailable and reliability requirements are relaxed

Compared with SMBJ28A-E3/52 and 1.5KE27A, the 1.5KA27HE3/51 delivers certified automotive robustness, higher surge capacity, and validated high-temperature stability-making it the sole choice for new AEC-Q101-compliant designs requiring 1500 W clamping at +185 °C junction temperature.

Availability

1.5KA27HE3/51 is available at Aetrix Electronics and suitable for automotive powertrain control, body electronics protection, and industrial motor drive interfaces requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 1.5KA27HE3/51 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 high-reliability diodes, rectifiers, and protection devices for demanding industrial and automotive applications.

The 1.5KA series was engineered specifically for AEC-Q101-compliant transient suppression in automotive 12 V systems, emphasizing thermal resilience, surge repeatability, and process-controlled reliability under high-temperature operational stress.

FAQ

What is the clamping voltage of the 1.5KA27HE3/51 under full-rated surge current?

The 1.5KA27HE3/51 has a maximum clamping voltage (V_C) of 39.1 V at its rated peak pulse current (I_PPM) of 38.4 A, measured using the standard 10/1000 µs waveform. This value ensures protected circuits remain below critical overvoltage thresholds during load dump events. The 1.5KA27HE3/51 maintains this clamping performance across its full operating temperature range due to its +0.096 %/°C V_BR coefficient and PAR® construction stability.

Is the 1.5KA27HE3/51 qualified for automotive applications?

Yes, the 1.5KA27HE3/51 carries AEC-Q101 qualification and is designated as an automotive-grade part (HE3 suffix). It meets JESD201 Class 2 whisker resistance requirements and is rated for operation from -65 °C to +185 °C junction temperature-validating its use in engine control units, body control modules, and other under-hood automotive systems. The 1.5KA27HE3/51 is explicitly listed in Vishay's automotive-grade TVS portfolio per Document Number 88300.

What is the stand-off voltage (V_WM) and leakage current specification for the 1.5KA27HE3/51?

The 1.5KA27HE3/51 has a maximum stand-off voltage (V_WM) of 21.8 V and guarantees reverse leakage current ≤1.0 µA at that voltage and 25 °C ambient. At elevated temperature (T_J = 150 °C), leakage remains ≤10 µA-critical for preserving accuracy in battery monitoring and sensor front-end circuits. These values are confirmed in the Electrical Characteristics table of the 1.5KA27HE3/51 datasheet revision 20-Oct-08.

Does the 1.5KA27HE3/51 support lead-free reflow soldering?

Yes, the 1.5KA27HE3/51 features matte tin-plated leads compliant with J-STD-002 and JESD22-B102 solderability standards, and is rated for solder dip at 260 °C for 40 seconds. Its HE3 suffix confirms RoHS compliance and suitability for lead-free reflow profiles used in modern automotive PCB assembly. The 1.5KA27HE3/51's epoxy molding compound also meets UL 94 V-0 flammability requirements.

How does the 1.5KA27HE3/51 differ from the 1.5KA27A variant?

The 1.5KA27HE3/51 has a V_BR range of 24.3 V to 29.7 V and clamps at 39.1 V, while the 1.5KA27A variant specifies a tighter V_BR range of 25.7 V to 28.4 V and clamps at 37.5 V. Both share identical P_PPM (1500 W), package (Case Style 1.5KA), and AEC-Q101 qualification. The 1.5KA27HE3/51 offers broader V_BR tolerance for cost-sensitive designs where exact threshold control is less critical than surge margin.

1.5KA27HE3/51 Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

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

Series:: PAR®

Packaging:: Bulk

Product Status:: Obsolete

Type:: Zener

Unidirectional Channels:: 1

Bidirectional Channels:: -

Voltage - Reverse Standoff (Typ):: 21.8V

Voltage - Breakdown (Min):: 24.3V

Voltage - Clamping (Max) @ Ipp:: 39.1V

Current - Peak Pulse (10/1000µs):: 38.4A

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

1.5KA27HE3/51 FAQ

1.How can I place an order for 1.5KA27HE3/51 through Aetrix?

Please submit a Request for Quotation (RFQ) for 1.5KA27HE3/51 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 1.5KA27HE3/51 reliable?

The price and inventory of 1.5KA27HE3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KA27HE3/51 is usually 5 days.

3.What payment methods are accepted for 1.5KA27HE3/51?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KA27HE3/51 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1.5KA27HE3/51?

1.5KA27HE3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1.5KA27HE3/51 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 1.5KA27HE3/51?

For technical support, including 1.5KA27HE3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KA27HE3/51 requirements.

6.How does Aetrix verify that 1.5KA27HE3/51 is sourced from the original manufacturer or authorized distributors?

All 1.5KA27HE3/51 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 1.5KA27HE3/51 meets industry standards.

7.What is the process for return or replacement of 1.5KA27HE3/51?

All 1.5KA27HE3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KA27HE3/51, 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 1.5KA27HE3/51 part is unused and in its original packaging.

Return procedure for 1.5KA27HE3/51:

1.Submit a request within 90 days.

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

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