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Vishay General Semiconductor - Diodes Division 1.5KE400CA/54
- Part No.:
- 1.5KE400CA/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE400CA/54.pdf
- Description:
- TVS DIODE 342VWM 548VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:7,360
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Product details
Overview
1.5KE400CA/54 from Vishay General Semiconductor is a bidirectional Transient Voltage Suppressor (TVS) diode designed for high-energy surge protection in power and signal lines. It features a 400 V standoff voltage (VWM), 456–504 V breakdown voltage (VBR), 1500 W peak pulse power (10/1000 µs), clamping voltage of 548 V at 2.7 A IPPM, and operates from –55 °C to +175 °C. It protects MOSFETs, ICs, and sensor interfaces against lightning-induced transients and inductive switching spikes.
For engineers reviewing the 1.5KE400CA/54 datasheet, 1.5KE400CA/54 pinout, 1.5KE400CA/54 application, or 1.5KE400CA/54 equivalent, this device is selected for robust overvoltage protection where bidirectional clamping, low clamping ratio, and AEC-Q101 qualification (in HE3 variants) are required - especially in automotive power distribution, industrial motor controls, and telecom line interface circuits.
Technical Context
This TVS diode uses a glass-passivated silicon junction optimized for fast response (<1 ns) and low incremental surge resistance. Its bidirectional structure enables symmetrical clamping across both polarities without external polarity management, making it suitable for AC-coupled or floating signal paths.
The 1.5KE400CA/54 complies with JEDEC standards for transient suppression and delivers stable performance under repetitive 10/1000 µs surges at ≤0.01% duty cycle. Thermal resistance is 15.4 °C/W (junction-to-lead), enabling reliable operation up to 175 °C junction temperature with appropriate PCB copper thermal relief.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 342 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR (Breakdown Voltage) | 380–420 V at 1 mA - Confirmed minimum/maximum threshold where avalanche conduction initiates reliably. |
| VC (Clamping Voltage) | 548 V at 2.7 A IPPM - Peak voltage seen by protected circuit during full-rated 1500 W transient; determines stress on downstream components. |
| PPPM (Peak Pulse Power) | 1500 W (10/1000 µs waveform) - Sustains high-energy surges common in lightning and load-switching events without failure. |
| Operating Temperature | –55 °C to +175 °C - Enables deployment in under-hood automotive, industrial drives, and outdoor telecom enclosures. |
| Leakage Current | ≤1.0 µA at VWM - Ensures negligible standby power loss and no interference with high-impedance sensing circuits. |
| Package | Case Style 1.5KE (DO-201AD) - Industry-standard axial-leaded package with 0.375" lead length; compatible with through-hole reflow and wave soldering. |
Pinout & Package
1.5KE400CA/54 uses the DO-201AD (Case Style 1.5KE) axial-leaded package. No polarity marking is present on bidirectional variants; both leads are electrically symmetrical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction terminal | Either lead serves as input/output path; identical clamping behavior in both directions - eliminates orientation concerns during placement. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated chip junction | Ensures long-term stability and moisture resistance in humid or contaminated environments without hermetic sealing. |
| 1500 W peak pulse power (10/1000 µs) | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth) when properly mounted with adequate trace width and ground plane. |
| Clamping ratio (VC/VBR) ≈ 1.39 | Low ratio minimizes voltage overshoot during transients - critical for protecting 3.3 V or 5 V logic interfaces downstream. |
| AEC-Q101 qualified option (HE3 suffix) | Validated for automotive powertrain and chassis applications requiring zero-defect reliability under thermal cycling and vibration stress. |
| UL 497B recognized (QVGQ2) | Approved for use in telecom and industrial safety-critical surge protection circuits per Underwriters Laboratories standards. |
Applications
| Automotive Power Distribution | Industrial Motor Drive Controls |
|---|---|
Use Scenario: Protection of 12 V/24 V battery-fed ECUs and body control modules against load dump and alternator transients. IC Role / Device Role / Timing Role: Primary clamping element placed at power entry point before DC/DC converters and microcontrollers. Use Value: Clamps 120 V/200 ms load dump spikes to <550 V, preventing latch-up or gate oxide damage in downstream MOSFET drivers and CAN transceivers. |
Use Scenario: Shielding PLC I/O modules and encoder feedback lines from inductive kickback in solenoid and relay coils. IC Role / Device Role / Timing Role: Bidirectional shunt protector on isolated analog inputs and digital status lines interfacing with field devices. Use Value: Sub-1 ns response prevents >300 V transients from propagating into 24 V logic rails, preserving signal integrity and reducing need for opto-isolation. |
| Telecom Line Interface | Consumer Appliance Power Supply |
Use Scenario: Surge protection on POTS or DSL line cards exposed to lightning-induced surges on outside plant wiring. IC Role / Device Role / Timing Role: First-stage protector ahead of hybrid transformers and line driver ICs in central office or CPE equipment. Use Value: Withstands 10/700 µs telecom surges up to 6 kV (per ITU-T K.20) when used with series impedance; clamps to safe levels for SLIC and codec ICs. |
Use Scenario: Secondary-side overvoltage clamp on switched-mode power supply outputs feeding microcontrollers and displays. IC Role / Device Role / Timing Role: Fail-safe crowbar element that activates only during catastrophic regulator failure or capacitor short. Use Value: Limits output rail excursion to ≤550 V during open-loop failure, preventing fire hazard and enabling compliance with IEC 62368-1 secondary circuit limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ400CA | Lower PPPM (600 W), smaller SMB package (surface-mount), lower clamping voltage (533 V at 1.7 A) | Better suited for space-constrained PCBs with moderate surge exposure (IEC 61000-4-5 Level 2); not rated for 1500 W events. | Select SMBJ400CA when board area is limited and peak surge energy is ≤600 W; verify thermal relief for sustained dissipation. |
| 1.5SMC400CA | Same 1500 W rating and VBR range, but SMC (DO-214AB) surface-mount package; slightly higher clamping (552 V at 2.7 A) | Enables automated assembly and improved high-frequency transient response due to lower parasitic inductance vs. axial leads. | Choose 1.5SMC400CA for new designs targeting SMT production and enhanced ESD/transient immunity above 100 MHz. |
Compared with 1.5KE400CA/54, SMBJ400CA trades peak power headroom for compactness, while 1.5SMC400CA retains full 1500 W capability in a more modern surface-mount form - both require layout review for thermal and inductive performance, unlike the proven axial-leaded 1.5KE400CA/54.
Availability
1.5KE400CA/54 is available at Aetrix Electronics and suitable for automotive power systems, industrial motor controllers, telecom line cards, and consumer appliance power supplies requiring stable component supply and long-lifecycle support.
Supply support for 1.5KE400CA/54 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, ruggedness, and industry-standard qualification.
The 1.5KE family was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure tolerance and long-term parametric stability are mandatory.
FAQ
What is the maximum clamping voltage of the 1.5KE400CA/54 under full-rated surge conditions?
The 1.5KE400CA/54 clamps to 548 V at its rated peak pulse current of 2.7 A (10/1000 µs waveform). This value is measured per JEDEC standard test conditions and represents the worst-case voltage imposed on protected circuitry during a 1500 W transient event. The 1.5KE400CA/54 maintains this clamping performance across its full operating temperature range from –55 °C to +175 °C.
Is the 1.5KE400CA/54 suitable for automotive applications?
Yes - the 1.5KE400CA/54 is offered in an AEC-Q101 qualified variant (1.5KE400CAHE3_B), which undergoes rigorous stress testing for automotive under-hood and chassis applications. While the base 1.5KE400CA/54 is commercial-grade, its 175 °C max junction temperature, robust glass passivation, and UL 497B recognition make it viable for non-safety-critical automotive subsystems when validated per OEM requirements.
How does the bidirectional design of the 1.5KE400CA/54 affect circuit layout?
The 1.5KE400CA/54 has no polarity marking and exhibits identical clamping behavior in both directions, eliminating orientation constraints during PCB placement. This simplifies layout for AC-coupled lines, transformer-isolated interfaces, or floating bus structures. Unlike unidirectional TVS diodes, the 1.5KE400CA/54 requires no series blocking diode or directional routing - reducing component count and board area.
What is the thermal resistance and how does it impact heatsinking for the 1.5KE400CA/54?
The 1.5KE400CA/54 has a typical junction-to-lead thermal resistance (RθJL) of 15.4 °C/W. With a 6.5 W steady-state power dissipation rating at TL = 75 °C, this means lead temperature must be held ≤75 °C to avoid derating. Effective thermal relief requires ≥100 mm² of 2 oz copper connected directly to each lead - critical for repeated surge events or high ambient temperatures.
Can the 1.5KE400CA/54 be used in parallel to increase surge handling capacity?
No - the 1.5KE400CA/54 should not be paralleled without individual current-sharing resistors. Due to manufacturing tolerances in VBR (±5%), mismatched avalanche turn-on causes one device to absorb most of the surge current, leading to premature failure. For higher power needs, select a single higher-rated device (e.g., 3KP400CA) or implement staged protection with series impedance.
1.5KE400CA/54 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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
1.5KE400CA/54 FAQ
1.How can I place an order for 1.5KE400CA/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE400CA/54 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 1.5KE400CA/54 reliable?
The price and inventory of 1.5KE400CA/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE400CA/54 is usually 5 days.
3.What payment methods are accepted for 1.5KE400CA/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE400CA/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE400CA/54?
1.5KE400CA/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE400CA/54 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 1.5KE400CA/54?
For technical support, including 1.5KE400CA/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE400CA/54 requirements.
6.How does Aetrix verify that 1.5KE400CA/54 is sourced from the original manufacturer or authorized distributors?
All 1.5KE400CA/54 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 1.5KE400CA/54 meets industry standards.
7.What is the process for return or replacement of 1.5KE400CA/54?
All 1.5KE400CA/54 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE400CA/54, 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 1.5KE400CA/54 part is unused and in its original packaging.
Return procedure for 1.5KE400CA/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE400CA/54 Tags
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