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

Vishay General Semiconductor - Diodes Division 1.5KA22HE3/51

Name: 1.5KA22HE3/51
Brand: Vishay General Semiconductor - Diodes Division
SKU: 1.5KA22HE3/51
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1.5KA22HE3/51

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

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

Datasheet:: 1.5KA22HE3/51.pdf

Description:: TVS DIODE 17.8VWM 31.9VC 1.5KA

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Product details

Overview

1.5KA22HE3/51 from Vishay General Semiconductor is an automotive-grade unidirectional transient voltage suppressor (TVS) diode designed for high-energy surge protection in power rails and signal lines. It delivers 1500 W peak pulse power (10/1000 µs), clamps at 31.9 V under 47 A surge current, and operates up to +185 °C junction temperature - enabling robust protection in engine control units and battery management systems.

For engineers reviewing the 1.5KA22HE3/51 datasheet, 1.5KA22HE3/51 pinout, 1.5KA22HE3/51 application, or 1.5KA22HE3/51 equivalent, key selection criteria include its AEC-Q101 qualification, 19.8–24.2 V breakdown range, low 0.092 %/°C V_BR tempco, and HE3 suffix meeting JESD201 Class 2 whisker resistance.

Technical Context

This TVS diode uses Vishay's patented PAR® construction for stable clamping under repetitive surge stress and high-temperature operation. Its unidirectional polarity and 1.5KA case style support fast response (<1 ns) and low incremental surge resistance - critical for protecting MOSFETs and ICs against load dump and inductive switching transients.

Rated for automotive environments, it complies with RoHS and WEEE directives, features matte tin-plated leads solderable per J-STD-002/JESD22-B102, and maintains reliable performance across -65 °C to +185 °C junction temperature range with derating above 25 °C ambient.

Key Specifications

Parameter	Value and Actual Design Meaning
Peak Pulse Power (10/1000 µs)	1500 W - sustains high-energy surges without failure in automotive load-dump events
Breakdown Voltage V_BR	19.8–24.2 V at 1 mA - defines precise clamping threshold for 24 V system rail protection
Clamping Voltage V_C	31.9 V at 47 A IPPM - limits downstream voltage stress during worst-case transients
Operating Temperature Range	-65 °C to +185 °C - enables under-hood deployment in engine control modules
AEC-Q101 Qualified	Yes - certified for automotive reliability including temperature cycling and HTRB
RoHS / Whisker Rating	RoHS-compliant HE3 suffix; JESD201 Class 2 whisker resistance - ensures long-term solder joint integrity

Pinout & Package

Package: Case Style 1.5KA - molded epoxy body with UL 94 V-0 rating, 0.375" lead length, axial-leaded DO-201AD outline (1.0" × 1.0" min footprint).

Pin/Terminal	Circuit Role	Design Meaning
Anode	Current entry terminal in forward bias; connected to protected circuit ground	Provides low-impedance path to ground during reverse-biased clamping events
Cathode	Current exit terminal in forward bias; marked by color band	Connected to line/rail being protected; absorbs surge energy when voltage exceeds V_BR

Key Features

Feature	Design Value
Patented PAR® construction	Enables stable V_BR and low dynamic impedance over lifetime and temperature extremes
1500 W peak pulse power	Meets ISO 7637-2 Pulse 5a (load dump) requirements for 24 V automotive systems
Low 0.092 %/°C V_BR tempco	Minimizes clamping voltage drift across under-hood temperature ranges (-40 °C to +150 °C)
Uni-directional polarity only	Simplifies layout for DC rail protection where reverse conduction is not required
Solder dip rated 260 °C / 40 s	Supports standard reflow and wave soldering without parameter shift or delamination

Applications

Engine Control Unit (ECU) Power Input	Automotive Battery Management System (BMS)
Use Scenario: Protects ECU microcontroller and CAN transceivers from alternator load dump transients on the 24 V main supply rail. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between 24 V input and chassis ground to clamp surges before LDO regulators. Use Value: Clamps to 31.9 V at 47 A, limiting stress on downstream 36 V-rated input capacitors and PMICs.	Use Scenario: Shields BMS analog front-end and cell monitoring ICs from switching noise and relay bounce on HV battery interconnects. IC Role / Device Role / Timing Role: Surge suppression element on precharge and main contactor control lines operating at 400–800 V nominal. Use Value: Withstands 200 A I_FSM and 185 °C T_J, ensuring reliability during repeated high-current switching cycles.
Body Control Module (BCM) LIN Bus Line	Electric Power Steering (EPS) Motor Driver Stage
Use Scenario: Guards LIN transceiver I/O pins against ESD and cable discharge events in door module wiring harnesses. IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly at connector interface to shunt transients before LIN PHY. Use Value: Fast response time and 1.0 µA leakage at 17.8 V V_WM prevent signal distortion while maintaining bus integrity.	Use Scenario: Protects gate drivers and high-side MOSFETs in EPS H-bridge from inductive kickback during motor commutation. IC Role / Device Role / Timing Role: Rail-clamp TVS on 12 V auxiliary supply feeding gate driver ICs and bootstrap circuits. Use Value: 6.5 W steady-state power dissipation supports continuous thermal management in sealed EPS enclosures.

Engine Control Unit (ECU) Power Input

Automotive Battery Management System (BMS)

Use Scenario: Protects ECU microcontroller and CAN transceivers from alternator load dump transients on the 24 V main supply rail.

IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between 24 V input and chassis ground to clamp surges before LDO regulators.

Use Value: Clamps to 31.9 V at 47 A, limiting stress on downstream 36 V-rated input capacitors and PMICs.

Use Scenario: Shields BMS analog front-end and cell monitoring ICs from switching noise and relay bounce on HV battery interconnects.

IC Role / Device Role / Timing Role: Surge suppression element on precharge and main contactor control lines operating at 400–800 V nominal.

Use Value: Withstands 200 A I_FSM and 185 °C T_J, ensuring reliability during repeated high-current switching cycles.

Body Control Module (BCM) LIN Bus Line

Electric Power Steering (EPS) Motor Driver Stage

Use Scenario: Guards LIN transceiver I/O pins against ESD and cable discharge events in door module wiring harnesses.

IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly at connector interface to shunt transients before LIN PHY.

Use Value: Fast response time and 1.0 µA leakage at 17.8 V V_WM prevent signal distortion while maintaining bus integrity.

Use Scenario: Protects gate drivers and high-side MOSFETs in EPS H-bridge from inductive kickback during motor commutation.

IC Role / Device Role / Timing Role: Rail-clamp TVS on 12 V auxiliary supply feeding gate driver ICs and bootstrap circuits.

Use Value: 6.5 W steady-state power dissipation supports continuous thermal management in sealed EPS enclosures.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMBJ22AHE3/52	600 W PPPM, 22 V standoff, DO-214AA package - lower power, smaller footprint	Suitable for non-load-dump scenarios like ESD protection on low-power sensor lines	Select when space-constrained and peak surge energy ≤600 W
1.5KE22A-E3/54	1500 W PPPM, same V_BR range, but DO-201AE package - no AEC-Q101 qualification	Limited to industrial/commercial use; lacks automotive reliability validation	Select only for cost-sensitive non-automotive designs requiring identical electrical specs

Compared with SMBJ22AHE3/52 and 1.5KE22A-E3/54, the 1.5KA22HE3/51 uniquely combines AEC-Q101 qualification, 185 °C T_Jmax, and 1.5KA mechanical robustness - making it the sole choice for under-hood automotive power rail protection where thermal and reliability margins are non-negotiable.

Availability

1.5KA22HE3/51 is available at Aetrix Electronics and suitable for engine control units, battery management systems, and electric power steering modules requiring stable component supply across extended temperature and high-reliability automotive programs.

Supply support for 1.5KA22HE3/51 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, MOSFETs, and optoelectronics for automotive, industrial, and computing markets.

The 1.5KA series was engineered specifically for automotive transient suppression - emphasizing AEC-Q101 compliance, high-temperature stability, and robust PAR® construction to meet ISO 7637-2 and ISO 16750-2 requirements.

FAQ

What is the breakdown voltage range of the 1.5KA22HE3/51?

The 1.5KA22HE3/51 has a specified breakdown voltage (V_BR) range of 19.8 V to 24.2 V at 1 mA test current, per Vishay Document 88300. This range ensures consistent clamping behavior across production lots and supports design margining for 24 V automotive systems where nominal rail voltage may vary during cranking or charging.

Is the 1.5KA22HE3/51 qualified for automotive use?

Yes, the 1.5KA22HE3/51 is AEC-Q101 qualified and designated as high-reliability/automotive grade (base P/NHE3). It undergoes rigorous stress testing including temperature cycling, highly accelerated life testing (HALT), and humidity bias HTRB - confirming suitability for under-hood applications such as ECUs and battery disconnect units.

What does the HE3 suffix indicate on the 1.5KA22HE3/51?

The HE3 suffix on the 1.5KA22HE3/51 denotes RoHS compliance, high-reliability construction, and qualification to JESD201 Class 2 for tin whisker resistance. It also confirms matte tin-plated leads compliant with J-STD-002 and JESD22-B102 solderability standards - essential for long-term reliability in automotive solder joints.

What is the maximum clamping voltage of the 1.5KA22HE3/51 under surge conditions?

The 1.5KA22HE3/51 exhibits a maximum clamping voltage (V_C) of 31.9 V at 47 A peak pulse current (I_PPM) with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during standardized surge events like ISO 7637-2 Pulse 5a.

Can the 1.5KA22HE3/51 be used in bidirectional configurations?

No, the 1.5KA22HE3/51 is available in uni-directional polarity only, as explicitly stated in the Vishay datasheet. Its cathode is marked by a color band, and it is not rated for reverse-biased conduction beyond its specified V_WM of 17.8 V - bidirectional protection requires separate devices or a dedicated bi-directional TVS.

1.5KA22HE3/51 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):: 17.8V

Voltage - Breakdown (Min):: 19.8V

Voltage - Clamping (Max) @ Ipp:: 31.9V

Current - Peak Pulse (10/1000µs):: 47A

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

1.5KA22HE3/51 FAQ

1.How can I place an order for 1.5KA22HE3/51 through Aetrix?

Please submit a Request for Quotation (RFQ) for 1.5KA22HE3/51 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 1.5KA22HE3/51 reliable?

The price and inventory of 1.5KA22HE3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KA22HE3/51 is usually 5 days.

3.What payment methods are accepted for 1.5KA22HE3/51?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KA22HE3/51 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1.5KA22HE3/51?

1.5KA22HE3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1.5KA22HE3/51 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 1.5KA22HE3/51?

For technical support, including 1.5KA22HE3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KA22HE3/51 requirements.

6.How does Aetrix verify that 1.5KA22HE3/51 is sourced from the original manufacturer or authorized distributors?

All 1.5KA22HE3/51 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 1.5KA22HE3/51 meets industry standards.

7.What is the process for return or replacement of 1.5KA22HE3/51?

All 1.5KA22HE3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KA22HE3/51, 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 1.5KA22HE3/51 part is unused and in its original packaging.

Return procedure for 1.5KA22HE3/51:

1.Submit a request within 90 days.

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

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