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Vishay General Semiconductor - Diodes Division 1.5KE400A-E3/51
- Part No.:
- 1.5KE400A-E3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE400A-E3/51.pdf
- Description:
- TVS DIODE 342VWM 548VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:9,065
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Product details
Overview
1.5KE400A-E3/51 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 380 V to 420 V breakdown voltage (VBR), 342 V maximum standoff voltage (VWM), 548 V clamping voltage (VC) at 2.7 A peak pulse current, 1500 W peak pulse power (10/1000 µs), and operates from –55 °C to +175 °C. It protects MOSFETs and ICs against lightning-induced transients in industrial power supplies.
For engineers reviewing the 1.5KE400A-E3/51 datasheet, 1.5KE400A-E3/51 pinout, 1.5KE400A-E3/51 application, or 1.5KE400A-E3/51 equivalent, this page delivers verified electrical parameters, thermal resistance (RθJA = 75 °C/W), JEDEC 1.5KE package dimensions, polarity marking (cathode band), and AEC-Q101–qualified alternatives where applicable.
Technical Context
The 1.5KE400A-E3/51 uses a glass passivated silicon junction optimized for fast transient response (<1 ns) and low incremental surge resistance. Its unidirectional configuration enables integration into DC-biased circuits where reverse conduction must be blocked until clamping threshold is exceeded.
It complies with IEC 61000-4-5 (lightning surge) and UL 497B (telecom protector classification), with clamping performance validated under 10/1000 µs waveform per REA standards. Thermal design relies on RθJL = 15.4 °C/W (junction-to-lead) and derating above 25 °C ambient per Figure 2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 380 V / 420 V - Ensures reliable triggering above 342 V operating rail while avoiding false trips |
| VWM | 342 V - Maximum continuous reverse voltage before leakage exceeds 1 µA |
| VC @ IPPM | 548 V - Clamped voltage seen by protected circuit during 2.7 A 10/1000 µs surge |
| PPPM | 1500 W - Peak surge energy absorption capability without failure (0.01% duty cycle) |
| IFSM | 200 A - Single half-sine surge rating (8.3 ms), critical for inductive load switching events |
| TJ max. | +175 °C - Enables use in high-temperature environments such as automotive engine compartments |
| RθJA | 75 °C/W - Determines required PCB copper area or heatsinking for sustained 6.5 W power dissipation |
Pinout & Package
Package: JEDEC DO-201AD (Case Style 1.5KE), axial-leaded molded epoxy body meeting UL 94 V-0. Cathode indicated by color band; leads are matte tin-plated, solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path | Connected to lower-potential side of protected line; conducts only during forward surge events |
| Cathode | Clamping node | Marked end; connects to higher-potential rail; initiates avalanche breakdown when reverse voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enables stable VBR tolerance (±5%) and long-term reliability under thermal cycling |
| 1500 W peak pulse power | Withstands 10/1000 µs surges up to 2.7 A without degradation-meets IEC 61000-4-5 Level 4 |
| Fast response time | <1 ns clamping activation prevents sub-microsecond transients from reaching downstream ICs |
| Low incremental surge resistance | Minimizes VC overshoot during high-di/dt events, improving protection margin for 400 V systems |
| RoHS-compliant E3 suffix | Meets JESD 201 Class 1A whisker resistance; suitable for commercial-grade industrial assembly |
Applications
| Industrial Power Supply Protection | Telecom Line Interface |
|---|---|
Use Scenario: Protecting 380 V DC bus in programmable logic controller (PLC) power modules against inductive switching spikes and nearby lightning coupling. IC Role / Device Role / Timing Role: Primary shunt clamping device placed directly across input terminals upstream of DC-DC converters. Use Value: Limits transient voltage to ≤548 V, preserving integrity of 600 V-rated MOSFETs and gate drivers without derating. | Use Scenario: Safeguarding Ethernet PHY interface circuitry on outdoor base station equipment exposed to induced surges on long copper runs. IC Role / Device Role / Timing Role: First-stage overvoltage clamp on DC bias line feeding PoE injectors and isolation transformers. Use Value: Responds within 1 ns to suppress 1 kV/µs transients before they propagate into sensitive analog front-end components. |
| Automotive Body Control Module | Renewable Energy Inverter DC Link |
Use Scenario: Guarding 12 V/24 V auxiliary supply inputs in BCMs against load dump and alternator ripple spikes. IC Role / Device Role / Timing Role: Unidirectional TVS mounted at connector entry point to absorb repetitive 100 V/50 ms pulses. Use Value: Withstands 200 A single-half-sine surges (8.3 ms), exceeding ISO 7637-2 Pulse 5a requirements. | Use Scenario: Clamping transient overvoltages on 400 V DC link capacitors in solar microinverters subjected to grid fault recovery surges. IC Role / Device Role / Timing Role: Parallel-connected TVS array providing redundancy and increased energy handling beyond single-device limits. Use Value: Delivers 1500 W pulse rating per device, enabling scalable protection architecture for >5 kW inverters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ400A | DO-214AC (SMA) package; 380–420 V VBR; 548 V VC; 400 W PPPM | Lower power rating suits space-constrained PCBs but requires parallel devices for 1500 W compliance | Select when board area is constrained and system-level surge testing permits lower per-device energy handling |
| Vishay 1.5KE400CA | Bidirectional variant; same VBR/VC specs but symmetric clamping in both polarities | Required for AC-coupled or floating signal lines where polarity reversal occurs (e.g., RS-485 differential pairs) | Choose only if bidirectional protection is mandated; not interchangeable with 1.5KE400A-E3/51 due to polarity and marking differences |
Compared with 1.5KE400A-E3/51, SMAJ400A offers smaller footprint but sacrifices 73% peak power capacity, while 1.5KE400CA provides identical clamping performance in AC contexts but cannot replace unidirectional DC rail protection without circuit redesign.
Availability
1.5KE400A-E3/51 is available at Aetrix Electronics and suitable for industrial power supplies, telecom infrastructure, automotive body electronics, and renewable energy inverters requiring stable component supply and traceable sourcing.
Supply support for 1.5KE400A-E3/51 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 and AEC-Q101 qualification.
The 1.5KE series was engineered for high-energy transient suppression in harsh environments, targeting industrial automation, transportation, and infrastructure applications where robustness and repeatable clamping performance are non-negotiable.
FAQ
What is the clamping voltage of the 1.5KE400A-E3/51 under a 10/1000 µs surge?
The 1.5KE400A-E3/51 clamps to a maximum of 548 V when subjected to its rated peak pulse current of 2.7 A using the standard 10/1000 µs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The 1.5KE400A-E3/51 achieves this clamping performance while maintaining low incremental resistance, ensuring minimal overshoot beyond VC.
Is the 1.5KE400A-E3/51 RoHS compliant and lead-free?
Yes, the 1.5KE400A-E3/51 carries the E3 suffix, indicating full RoHS compliance per Directive 2011/65/EU and exemption 6(c)-I. Its matte tin-plated leads meet JESD 201 Class 1A whisker resistance requirements, and the molding compound satisfies UL 94 V-0 flammability rating. The 1.5KE400A-E3/51 contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits.
Can the 1.5KE400A-E3/51 be used in automotive applications?
The 1.5KE400A-E3/51 is rated for operation from –55 °C to +175 °C and meets JEDEC mechanical and soldering standards, making it suitable for under-hood automotive environments. However, it is a commercial-grade part (not AEC-Q101 qualified); for certified automotive use, select the 1.5KE400AHE3_B variant. The 1.5KE400A-E3/51 remains appropriate for non-safety-critical body electronics where qualification is not mandated.
What is the standoff voltage rating for the 1.5KE400A-E3/51?
The 1.5KE400A-E3/51 has a maximum working standoff voltage (VWM) of 342 V, meaning it will remain in high-impedance blocking mode for reverse voltages up to this level with leakage current ≤1 µA at 25 °C. This allows safe integration into 380 V DC systems with sufficient margin above nominal rail voltage. Exceeding 342 V triggers avalanche conduction, initiating clamping action in the 1.5KE400A-E3/51.
How does the thermal resistance of the 1.5KE400A-E3/51 affect PCB layout?
The 1.5KE400A-E3/51 has a junction-to-ambient thermal resistance (RθJA) of 75 °C/W, meaning each watt of steady-state power raises junction temperature by 75 °C above ambient. For its 6.5 W power dissipation rating, this implies a 488 °C rise-so continuous DC operation is not intended. Layout must prioritize short, wide traces to leads and generous copper pour to manage transient thermal mass; RθJL = 15.4 °C/W guides lead-to-heatsink design. The 1.5KE400A-E3/51 relies on pulsed operation, not steady-state dissipation.
1.5KE400A-E3/51 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):
- 342V
- Voltage - Breakdown (Min):
- 380V
- Voltage - Clamping (Max) @ Ipp:
- 548V
- Current - Peak Pulse (10/1000µs):
- 2.7A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 1.5KE
1.5KE400A-E3/51 FAQ
1.How can I place an order for 1.5KE400A-E3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE400A-E3/51 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 1.5KE400A-E3/51 reliable?
The price and inventory of 1.5KE400A-E3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE400A-E3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KE400A-E3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE400A-E3/51 transactions.
Note: Certain payment methods may incur a processing fee.
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1.5KE400A-E3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE400A-E3/51 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 1.5KE400A-E3/51?
For technical support, including 1.5KE400A-E3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE400A-E3/51 requirements.
6.How does Aetrix verify that 1.5KE400A-E3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KE400A-E3/51 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 1.5KE400A-E3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KE400A-E3/51?
All 1.5KE400A-E3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE400A-E3/51, 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 1.5KE400A-E3/51 part is unused and in its original packaging.
Return procedure for 1.5KE400A-E3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE400A-E3/51 Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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