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Vishay General Semiconductor - Diodes Division 1.5KA20HE3/51
- Part No.:
- 1.5KA20HE3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KA20HE3/51.pdf
- Description:
- TVS DIODE 16.2VWM 29.1VC 1.5KA
- Quantity:
- Payment:
- Shipping:
Inventory:3,467
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Product details
Overview
1.5KA20HE3/51 from Vishay General Semiconductor is a unidirectional automotive-grade transient voltage suppressor (TVS) diode designed for high-energy surge protection in harsh environments. It delivers 1500 W peak pulse power (10/1000 µs), clamps at 29.1 V under 51.5 A peak pulse current, and operates up to +185 °C junction temperature - ideal for protecting MOSFETs and sensor signal lines in automotive powertrain control modules.
For engineers reviewing the 1.5KA20HE3/51 datasheet, 1.5KA20HE3/51 pinout, 1.5KA20HE3/51 application, or 1.5KA20HE3/51 equivalent, key selection criteria include its AEC-Q101 qualification, 18.0–22.0 V breakdown voltage range, 16.2 V stand-off voltage, 1.0 µA max reverse leakage at VWM, and 3.5 V forward voltage at 100 A - all critical for robust ESD and load-dump immunity in 12 V/24 V vehicle systems.
Technical Context
This TVS diode employs Vishay's patented PAR® construction for stable clamping under repeated surge stress and features a molded epoxy case rated UL 94 V-0. Its unidirectional polarity and low incremental surge resistance enable precise overvoltage limiting during fast transients such as inductive switching spikes.
Rated for operation from –65 °C to +185 °C and qualified per AEC-Q101, the 1.5KA20HE3/51 supports automotive reliability requirements including solder dip at 260 °C for 40 s and JESD201 Class 2 whisker resistance - confirming suitability for under-hood and transmission-control applications.
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 VBR | 18.0–22.0 V - defines reliable conduction onset above normal system operating voltage |
| Clamping Voltage VC at IPPM | 29.1 V - limits downstream voltage to safe levels during 51.5 A transient |
| Stand-off Voltage VWM | 16.2 V - ensures no conduction during nominal 12 V system operation with margin |
| Max Reverse Leakage ID | 1.0 µA at VWM - minimizes standby power loss in always-on circuits |
| Junction Temperature Range | –65 °C to +185 °C - enables deployment in engine bay and power electronics enclosures |
Pinout & Package
Package: Case Style 1.5KA - axial-leaded, molded epoxy body with matte tin-plated leads; UL 94 V-0 rated; cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias | Connected to ground or low-side reference in unidirectional TVS configuration |
| Cathode | Current exit point in forward bias; protected line connection | Connected to the signal or power line requiring transient suppression (e.g., CAN bus, sensor supply) |
Key Features
| Feature | Design Value |
|---|---|
| Patented PAR® construction | Enables consistent clamping performance across thermal cycling and repeated surge events |
| AEC-Q101 qualification | Validates reliability for automotive powertrain, chassis, and body electronics |
| 1500 W peak pulse power | Meets ISO 7637-2 Pulse 5a (load dump) requirements for 12 V systems |
| Low incremental surge resistance | Reduces voltage overshoot during fast-rising transients (<1 ns response time) |
| RoHS-compliant HE3 suffix | Meets JESD201 Class 2 whisker resistance and automotive soldering process standards |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Motor Drive Interface |
|---|---|
Use Scenario: Protecting microcontroller I/O and power MOSFET gate drivers from inductive kickback during fuel injector or solenoid actuation. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between protected node and ground to shunt surge energy before IC damage occurs. Use Value: Withstands 1500 W pulses and operates up to +185 °C, ensuring reliability in high-temperature ECU environments where standard TVS devices fail. | Use Scenario: Safeguarding encoder feedback lines and analog sensor inputs in variable-frequency drives exposed to switching noise and ground bounce. IC Role / Device Role / Timing Role: Standoff voltage of 16.2 V prevents conduction during normal 10–15 V analog signaling while clamping >29 V transients. Use Value: Low 1.0 µA leakage at VWM avoids signal offset errors in precision 12-bit ADC front-ends. |
| Telecom Power Supply Input | Automotive Body Control Module (BCM) |
Use Scenario: Suppressing lightning-induced surges on 24 V DC input rails of base station power supplies. IC Role / Device Role / Timing Role: Primary overvoltage protection stage upstream of DC-DC converters and PMICs. Use Value: 1500 W rating and 29.1 V clamping voltage limit stress on downstream 30 V-rated MOSFETs and controllers. | Use Scenario: Shielding LIN bus transceivers and LED driver ICs from battery reverse-polarity and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS connected anode-to-ground, cathode-to-LIN line to absorb negative-going spikes and positive surges. Use Value: AEC-Q101 qualification and –65 °C to +185 °C operation ensure compliance with automotive environmental test profiles (e.g., GMW3172). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A-E3/5A | Lower peak pulse power (400 W), smaller SMA package, 20 V nominal VBR | Not AEC-Q101 qualified; limited to commercial-temperature industrial use | Select when board space is constrained and automotive qualification is not required |
| 1.5KE20A | Same 1500 W rating but TO-204AA (DO-41) package; non-automotive grade; no HE3 whisker testing | Lacks AEC-Q101 qualification and high-temp derating data beyond 150 °C | Choose only for cost-sensitive non-automotive designs where 185 °C operation is unnecessary |
Compared with SMAJ20A-E3/5A and 1.5KE20A, the 1.5KA20HE3/51 provides higher temperature capability (+185 °C), automotive qualification, and verified lead finish reliability - making it the sole option for under-hood ECU and transmission control applications demanding long-term field robustness.
Availability
1.5KA20HE3/51 is available at Aetrix Electronics and suitable for automotive engine control units, industrial motor drive interfaces, and telecom power supply inputs requiring stable component supply with full traceability and long-lifecycle support.
Supply support for 1.5KA20HE3/51 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 automotive, industrial, and computing markets.
The 1.5KA series was engineered specifically for AEC-Q101-compliant transient suppression in automotive power systems - emphasizing high-temperature stability, repeatable clamping, and process-controlled lead finishes for automated assembly.
FAQ
What is the breakdown voltage range for the 1.5KA20HE3/51?
The 1.5KA20HE3/51 has a specified breakdown voltage (VBR) range of 18.0 V to 22.0 V at 10 mA test current, measured per ANSI/IEEE C62.35. This range ensures reliable turn-on above nominal 12 V system voltage while maintaining margin against false triggering during ripple or noise.
Is the 1.5KA20HE3/51 qualified for automotive use?
Yes, the 1.5KA20HE3/51 is AEC-Q101 qualified and designated as high-reliability/automotive grade (Base P/NHE3). It meets rigorous stress tests including temperature cycling, humidity bias, and mechanical shock - confirmed in Vishay Document Number 88300.
What is the maximum clamping voltage of the 1.5KA20HE3/51 under surge conditions?
The 1.5KA20HE3/51 clamps to a maximum of 29.1 V when subjected to its rated 51.5 A peak pulse current (IPPM) using a 10/1000 µs waveform. This value is guaranteed per the Electrical Characteristics table in the official datasheet.
Does the 1.5KA20HE3/51 have unidirectional or bidirectional polarity?
The 1.5KA20HE3/51 is available in uni-directional polarity only, as explicitly stated in the Features section of Vishay Document 88300. The cathode is marked by a color band on the epoxy body.
What packaging format is used for the 1.5KA20HE3/51?
The 1.5KA20HE3/51 ships in 13" diameter paper tape and reel packaging with a base quantity of 1400 units per reel (package code 54), as specified in the Ordering Information section of the Vishay datasheet.
1.5KA20HE3/51 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):
- 16.2V
- Voltage - Breakdown (Min):
- 18V
- Voltage - Clamping (Max) @ Ipp:
- 29.1V
- Current - Peak Pulse (10/1000µs):
- 51.5A
- 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
1.5KA20HE3/51 FAQ
1.How can I place an order for 1.5KA20HE3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KA20HE3/51 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 1.5KA20HE3/51 reliable?
The price and inventory of 1.5KA20HE3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KA20HE3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KA20HE3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KA20HE3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KA20HE3/51?
1.5KA20HE3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KA20HE3/51 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 1.5KA20HE3/51?
For technical support, including 1.5KA20HE3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KA20HE3/51 requirements.
6.How does Aetrix verify that 1.5KA20HE3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KA20HE3/51 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 1.5KA20HE3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KA20HE3/51?
All 1.5KA20HE3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KA20HE3/51, 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 1.5KA20HE3/51 part is unused and in its original packaging.
Return procedure for 1.5KA20HE3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KA20HE3/51 Tags
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