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Vishay General Semiconductor - Diodes Division 1.5KE20AHE3/51
- Part No.:
- 1.5KE20AHE3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE20AHE3/51.pdf
- Description:
- TVS DIODE 17.1VWM 27.7VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:5,321
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Product details
Overview
1.5KE20AHE3/51 from Vishay General Semiconductor is a uni-directional transient voltage suppressor (TVS) diode designed for primary overvoltage protection of sensitive electronics. It features a 20 V breakdown voltage (VBR = 19.0–21.0 V at 1.0 mA), 1500 W peak pulse power rating (10/1000 µs waveform), clamping voltage of 27.7 V at 54.2 A, and AEC-Q101 qualification for automotive-grade reliability - deployed in DC power rails and signal lines of automotive ECUs and industrial sensor interfaces.
For engineers reviewing the 1.5KE20AHE3/51 datasheet, 1.5KE20AHE3/51 pinout, 1.5KE20AHE3/51 application, or 1.5KE20AHE3/51 equivalent, key selection criteria include its uni-directional polarity, 17.1 V stand-off voltage (VWM), 1.0 µA max reverse leakage at VWM, 175 °C maximum junction temperature, and RoHS-compliant HE3 suffix indicating JESD 201 Class 2 whisker resistance and AEC-Q101 qualification.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ) below VWM = 17.1 V, then rapidly avalanches into low-impedance conduction when transient voltage exceeds VBR = 19.0–21.0 V. Its glass-passivated junction enables sub-nanosecond response time (<1 ns) and stable clamping performance across temperature.
The device uses a DO-201AD package with axial leads, rated for 200 A non-repetitive forward surge current (8.3 ms half-sine), 6.5 W steady-state power dissipation on infinite heatsink, and thermal resistance RθJL = 15.4 °C/W - enabling robust transient energy absorption without thermal runaway in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 19.0 V / 21.0 V at 1.0 mA - defines precise avalanche initiation threshold for repeatable clamping onset |
| VWM | 17.1 V - maximum continuous working voltage; ensures no conduction during nominal 15 V DC rail operation |
| IPPM | 54.2 A at 10/1000 µs - peak surge current capability directly determines protected circuit's I2t withstand margin |
| VC | 27.7 V - clamped voltage at IPPM; limits downstream IC stress to safe levels during transients |
| PPPM | 1500 W - peak pulse power handling capacity defines maximum transient energy absorption per event |
| TJ max | +175 °C - extended junction temperature range supports under-hood automotive and high-ambient industrial use |
| AEC-Q101 | Qualified - validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD |
Pinout & Package
Package: DO-201AD (Case Style 1.5KE), axial-leaded, molded epoxy body meeting UL 94 V-0; matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-voltage return path; forms cathode-to-anode clamping path during positive transients |
| Cathode | High-side transient sensing node | Connected to protected line (e.g., 12 V supply); color band identifies this terminal for correct uni-directional orientation |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR tolerance (±5 %), low leakage (<1 µA), and long-term reliability under thermal cycling |
| 1500 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 Level 4 surge immunity (4 kV line-earth) without external series impedance |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, body control, and ADAS modules requiring zero-defect field performance |
| 175 °C maximum junction temperature | Enables placement near heat sources (e.g., power MOSFETs, DC/DC converters) without derating penalties |
| HE3 suffix | Indicates RoHS compliance, JESD 201 Class 2 whisker resistance, and AEC-Q101 qualification per 1.5KE20AHE3_A revision |
Applications
| Automotive Power Supply Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed microcontroller power inputs against load dump (ISO 16750-2) and alternator ripple. IC Role / Device Role / Timing Role: Shunt clamping element placed between VIN and GND, responding within <1 ns to limit voltage excursion to ≤27.7 V. Use Value: Prevents latch-up or gate oxide damage in MCU power management ICs during 35 V/100 ms load dump events. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC analog input cards. IC Role / Device Role / Timing Role: Uni-directional TVS placed across sensor output and ground to clamp ESD (IEC 61000-4-2 ±8 kV) and inductive switching spikes. Use Value: Maintains signal integrity by limiting transient overvoltage to <27.7 V, preserving 12-bit ADC accuracy and preventing sensor output saturation. |
| Telecom DC Feeder Protection | Consumer Appliance Motor Drive Protection |
|
Use Scenario: Shielding PoE-powered Ethernet switch ports from lightning-induced surges on 48 V DC feeder lines. IC Role / Device Role / Timing Role: Primary clamping device on DC input rail upstream of DC/DC converter, triggered before secondary protection stages. Use Value: Absorbs up to 1500 W of surge energy (10/1000 µs), reducing stress on downstream TVS arrays and enabling smaller system-level protection footprints. |
Use Scenario: Suppressing back-EMF transients generated by brushed DC motors in washing machine control boards. IC Role / Device Role / Timing Role: Mounted across motor terminals or H-bridge supply rails to divert inductive kickback away from driver ICs. Use Value: Limits voltage overshoot to 27.7 V, preventing destructive breakdown of 30 V-rated half-bridge MOSFETs during frequent motor commutation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20A | DO-214AA package (SMB), lower PPPM = 600 W, same VBR range (19.0–21.0 V), higher VC = 32.4 V | Compact surface-mount footprint; less robust for high-energy transients like load dump | Select SMBJ20A only when board space is constrained and surge energy is limited to IEC 61000-4-5 Level 2 (1 kV) |
| 1.5KE20CA | Bi-directional variant (same VBR, VC, PPPM), symmetric clamping for AC-coupled or floating lines | Required for bidirectional signal lines (e.g., RS-485, CAN bus) where polarity reversal occurs | Choose 1.5KE20CA instead of 1.5KE20AHE3/51 only when protecting differential or AC-signaled paths needing symmetrical clamping |
Compared with SMBJ20A, 1.5KE20AHE3/51 delivers 2.5× higher surge power handling and lower clamping voltage - critical for automotive load dump; compared with 1.5KE20CA, it offers superior unidirectional efficiency and lower leakage but cannot protect bidirectional signals.
Availability
1.5KE20AHE3/51 is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom DC power system integration requiring stable component supply and long-term lifecycle assurance.
Supply support for 1.5KE20AHE3/51 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 diodes, rectifiers, and protection devices with emphasis on reliability, power handling, and automotive qualification.
The 1.5KE family was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where failure modes demand proven AEC-Q101 validation and 1500 W surge resilience.
FAQ
What is the breakdown voltage tolerance for 1.5KE20AHE3/51?
The 1.5KE20AHE3/51 has a specified breakdown voltage range of 19.0 V to 21.0 V at 1.0 mA test current, representing a ±5 % tolerance around the nominal 20 V rating. This tight VBR window ensures consistent clamping behavior across production lots and supports reliable coordination with downstream overvoltage protection thresholds in systems using the 1.5KE20AHE3/51.
Is 1.5KE20AHE3/51 suitable for automotive applications?
Yes, 1.5KE20AHE3/51 is AEC-Q101 qualified and carries the HE3 suffix denoting compliance with JESD 201 Class 2 whisker testing and RoHS requirements - making it approved for automotive powertrain, body electronics, and ADAS modules. Its 175 °C maximum junction temperature and validated performance under temperature cycling and humidity testing confirm suitability for under-hood and chassis-mounted use cases involving the 1.5KE20AHE3/51.
How does the clamping voltage of 1.5KE20AHE3/51 compare to its breakdown voltage?
The 1.5KE20AHE3/51 clamps at 27.7 V when subjected to its rated peak pulse current of 54.2 A (10/1000 µs waveform), which is approximately 38 % above its minimum breakdown voltage of 19.0 V. This incremental clamping voltage (ΔVC = 8.7 V) reflects low dynamic impedance and ensures protected circuits experience minimal overvoltage stress during high-energy transients handled by the 1.5KE20AHE3/51.
What is the meaning of the "HE3/51" suffix in 1.5KE20AHE3/51?
The "HE3" portion indicates RoHS compliance, AEC-Q101 qualification, and JESD 201 Class 2 whisker resistance; "/51" denotes the preferred packaging code for 1.5KE20AHE3/51 - specifically 13-inch paper tape and reel with 1400 units per reel. This packaging format supports automated SMT placement and ensures traceable, moisture-sensitive device handling per J-STD-020 for the 1.5KE20AHE3/51.
Can 1.5KE20AHE3/51 be used in parallel for higher surge current handling?
While the 1.5KE20AHE3/51 datasheet notes TVS diodes can be used in parallel to increase peak power ratings, doing so requires careful matching of VBR (±2 % recommended) and thermal layout symmetry to ensure current sharing. Unmatched parallel use of 1.5KE20AHE3/51 devices may result in uneven stress and premature failure of one unit - discrete sizing or higher-rated single devices are preferred unless matched lots and thermal coupling are guaranteed.
1.5KE20AHE3/51 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- TransZorb®
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 17.1V
- Voltage - Breakdown (Min):
- 19V
- Voltage - Clamping (Max) @ Ipp:
- 27.7V
- Current - Peak Pulse (10/1000µs):
- 54.2A
- 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
1.5KE20AHE3/51 FAQ
1.How can I place an order for 1.5KE20AHE3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE20AHE3/51 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 1.5KE20AHE3/51 reliable?
The price and inventory of 1.5KE20AHE3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE20AHE3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KE20AHE3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE20AHE3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE20AHE3/51?
1.5KE20AHE3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE20AHE3/51 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 1.5KE20AHE3/51?
For technical support, including 1.5KE20AHE3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE20AHE3/51 requirements.
6.How does Aetrix verify that 1.5KE20AHE3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KE20AHE3/51 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 1.5KE20AHE3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KE20AHE3/51?
All 1.5KE20AHE3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE20AHE3/51, 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 1.5KE20AHE3/51 part is unused and in its original packaging.
Return procedure for 1.5KE20AHE3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE20AHE3/51 Tags
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Diodes Incorporated
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