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Vishay General Semiconductor - Diodes Division 1.5KE51AHE3/51
- Part No.:
- 1.5KE51AHE3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE51AHE3/51.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:9,881
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Product details
Overview
1.5KE51AHE3/51 from Vishay General Semiconductor is a uni-directional Transient Voltage Suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 48.5 V to 53.6 V breakdown voltage (VBR) at 1 mA, 43.6 V maximum stand-off voltage (VWM), 70.1 V clamping voltage (VC) at 21.4 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform - used to safeguard MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the 1.5KE51AHE3/51 datasheet, 1.5KE51AHE3/51 pinout, 1.5KE51AHE3/51 application, or 1.5KE51AHE3/51 equivalent, key selection criteria include its AEC-Q101 qualification, 175 °C max junction temperature, 0.102 %/°C VBR temperature coefficient, RoHS-compliant HE3 suffix, and compatibility with J-STD-002 solderability standards.
Technical Context
This TVS diode operates as a uni-directional clamping device with avalanche breakdown behavior, triggered when reverse voltage exceeds VBR. Its glass-passivated junction ensures stable leakage performance and low incremental surge resistance, enabling sub-nanosecond response time (<1 ns) to transient events such as ESD, inductive switching spikes, and lightning-induced surges.
The device is rated for 1500 W peak pulse power under 10/1000 µs waveform at 0.01 % duty cycle, with thermal resistance of 75 °C/W (junction-to-ambient) and 15.4 °C/W (junction-to-lead). It supports 200 A non-repetitive forward surge current (IFSM) and exhibits 3.5 V max forward voltage at 100 A - critical for minimizing conduction loss during fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 48.5 V / 53.6 V at 1 mA - defines precise voltage threshold for avalanche conduction onset |
| VWM | 43.6 V - maximum continuous reverse operating voltage before leakage exceeds 1 µA |
| VC @ IPPM | 70.1 V at 21.4 A - clamped voltage seen by protected circuit during 10/1000 µs transient |
| PPPM | 1500 W - peak transient energy absorption capability without failure |
| IFSM | 200 A - withstands single half-sine surge up to 8.3 ms without bond wire fusing |
| TJ max | 175 °C - enables reliable operation in high-temperature industrial and automotive under-hood environments |
| Temp. Coeff. of VBR | 0.102 %/°C - quantifies drift in breakdown voltage across operating temperature range |
Pinout & Package
Package: Case Style 1.5KE - molded epoxy body with matte tin-plated leads; meets UL 94 V-0 flammability rating and JESD 22-B102 solderability requirements. Cathode indicated by color band on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-impedance return in uni-directional clamp configuration |
| Cathode | Reverse-biased terminal / clamping node | Connected to protected line; conducts avalanche current when VREV > VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR tolerance and low leakage (<1 µA at VWM) over lifetime and temperature |
| AEC-Q101 qualified | Validated for automotive-grade reliability including HTOL, TC, and HAST testing per stress test plan |
| 1500 W peak pulse power | Supports robust protection against IEC 61000-4-5 Level 4 (4 kV surge) in industrial power inputs |
| Sub-nanosecond response | Clamps transients within <1 ns - faster than MOVs or polymer-based protectors, preserving signal integrity |
| RoHS-compliant HE3 suffix | Meets JESD 201 Class 2 whisker resistance and JEDEC MSL-1 handling requirements |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) Power Rail |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) exposed to load dump and relay coil flyback. IC Role / Device Role / Timing Role: Uni-directional TVS placed between +24 V rail and chassis ground to clamp transients before they reach DC/DC converter ICs. Use Value: Limits voltage to ≤70.1 V during 1500 W surges, preventing damage to 36 V-rated input capacitors and synchronous buck controllers. |
Use Scenario: 12 V battery-fed power domain in BCM subjected to ISO 7637-2 Pulse 5a (load dump). IC Role / Device Role / Timing Role: Primary clamping device on main VBAT line, coordinated with upstream fuse and downstream LDO regulators. Use Value: Withstands 200 A surge current and operates up to 175 °C ambient, meeting AEC-Q101 requirements for under-hood electronics. |
| Telecom Remote Radio Unit (RRU) DC Feeder Line | Consumer Appliance Motor Drive Board |
Use Scenario: Outdoor RRU powered via 48 V PoE-like feeder cable susceptible to induced lightning surges. IC Role / Device Role / Timing Role: First-stage protector on DC input, preceding DC/DC isolation and Ethernet PHY interface. Use Value: Clamps 10/1000 µs surges to 70.1 V while maintaining <1 µA leakage at 43.6 V - avoids false triggering in always-on monitoring circuits. |
Use Scenario: Brushless DC motor driver board in smart HVAC system experiencing back-EMF spikes during commutation. IC Role / Device Role / Timing Role: Parallel-connected TVS across H-bridge high-side FET source-drain to suppress inductive kickback. Use Value: Sub-ns response prevents FET avalanche failure; 1500 W rating handles repetitive 100–200 A spikes without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A | 600 W PPPM, SMC package (smaller footprint), 51 V VBR range identical | Limited to lower-energy transients; unsuitable for IEC 61000-4-5 Level 4 | Select when board space is constrained and surge threat level is ≤1 kV |
| 1.5KE51CA | Bi-directional variant; same VBR/VC specs but symmetric clamping in both polarities | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) | Choose only if protecting bidirectional data lines or ungrounded circuits |
Compared with SMBJ51A and 1.5KE51CA, the 1.5KE51AHE3/51 delivers higher surge robustness (1500 W vs. 600 W) and automotive qualification, while offering uni-directional optimization for DC power rails - making it preferred for industrial and automotive power input stages where unidirectional clamping suffices and energy levels exceed 1 kV.
Availability
1.5KE51AHE3/51 is available at Aetrix Electronics and suitable for industrial power supply input protection, automotive body control module (BCM) designs, and telecom remote radio unit (RRU) DC feeder line protection requiring stable component supply and long-term lifecycle continuity.
Supply support for 1.5KE51AHE3/51 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, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and AEC-Q qualification.
The 1.5KE series was engineered for high-energy transient suppression in harsh environments - targeting industrial automation, automotive power distribution, and infrastructure equipment where 1500 W surge immunity and 175 °C operation are mandatory.
FAQ
What is the breakdown voltage tolerance of the 1.5KE51AHE3/51?
The 1.5KE51AHE3/51 has a specified breakdown voltage range of 48.5 V to 53.6 V at 1 mA test current, representing ±5.2% tolerance about the nominal 51 V rating. This tight VBR window ensures consistent clamping behavior across production lots and supports predictable overvoltage protection design margins in systems like 48 V telecom power supplies.
Is the 1.5KE51AHE3/51 suitable for automotive applications?
Yes, the 1.5KE51AHE3/51 carries AEC-Q101 qualification (per note 2 on page 3 of Vishay document 88301), confirming compliance with stress tests for temperature cycling, high-temperature operating life, and humidity exposure. Its 175 °C max junction temperature and HE3 suffix (JESD 201 Class 2 whisker resistance) make it appropriate for under-hood and body control module use cases.
How does the clamping voltage of 1.5KE51AHE3/51 compare to its breakdown voltage?
The 1.5KE51AHE3/51 clamps at 70.1 V when subjected to its rated 21.4 A peak pulse current (10/1000 µs), which is approximately 37 % above its minimum breakdown voltage of 48.5 V. This VC–VBR margin defines the voltage overshoot seen by downstream components and confirms effective transient suppression without excessive overvoltage stress on protected ICs.
What is the meaning of the 'HE3' suffix in 1.5KE51AHE3/51?
The 'HE3' suffix indicates RoHS-compliant construction with AEC-Q101 qualification and JESD 201 Class 2 whisker resistance. Unlike standard 'E3' parts, 'HE3' devices undergo additional reliability screening for automotive use, including extended temperature cycling and biased HAST testing - verified per Vishay's internal qualification report referenced in document 88301.
Can the 1.5KE51AHE3/51 be used in parallel for higher surge current handling?
Yes, multiple 1.5KE51AHE3/51 devices can be paralleled to increase total peak pulse current capacity, provided layout symmetry, matched trace inductance, and thermal coupling are maintained. However, derating is required due to minor VBR tolerances; Vishay recommends using external ballast resistors or selecting higher-power alternatives like 3KP51A for >30 A aggregate needs.
1.5KE51AHE3/51 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):
- 43.6V
- Voltage - Breakdown (Min):
- 48.5V
- Voltage - Clamping (Max) @ Ipp:
- 70.1V
- Current - Peak Pulse (10/1000µs):
- 21.4A
- 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
1.5KE51AHE3/51 FAQ
1.How can I place an order for 1.5KE51AHE3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE51AHE3/51 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 1.5KE51AHE3/51 reliable?
The price and inventory of 1.5KE51AHE3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE51AHE3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KE51AHE3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE51AHE3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE51AHE3/51?
1.5KE51AHE3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE51AHE3/51 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 1.5KE51AHE3/51?
For technical support, including 1.5KE51AHE3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE51AHE3/51 requirements.
6.How does Aetrix verify that 1.5KE51AHE3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KE51AHE3/51 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 1.5KE51AHE3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KE51AHE3/51?
All 1.5KE51AHE3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE51AHE3/51, 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 1.5KE51AHE3/51 part is unused and in its original packaging.
Return procedure for 1.5KE51AHE3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE51AHE3/51 Tags
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