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Diodes Incorporated 1.5KE400A-T
- Part No.:
- 1.5KE400A-T
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE400A-T.pdf
- Description:
- TVS DIODE 342VWM 548VC DO201
- Quantity:
- Payment:
- Shipping:
Inventory:8,130
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Product details
Overview
1.5KE400A-T from Diodes Incorporated is a unidirectional 1500W transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power lines and signal interfaces. It features a 342–420 V breakdown voltage range, 548 V maximum clamping voltage at 4.0 A peak pulse current, and DO-201 axial package construction with glass-passivated die for robust surge immunity in industrial power supplies.
For engineers reviewing the 1.5KE400A-T datasheet, 1.5KE400A-T pinout, 1.5KE400A-T application, or 1.5KE400A-T equivalent, key selection criteria include standoff voltage (342 V min), clamping performance under 1.0 ms pulse, thermal derating above +25°C, RoHS-compliant lead finish, and compatibility with automated through-hole assembly processes.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector, triggering when reverse voltage exceeds its 342–420 V breakdown range. Its glass-passivated junction ensures stable leakage (<5 µA @ 342 V) and fast response time (<1.0 ps), critical for safeguarding downstream regulators and controllers against lightning-induced surges or inductive switching transients.
The device is rated for 1500 W peak pulse power (tP = 1.0 ms), 5.0 W steady-state dissipation at 75°C lead temperature, and withstands 200 A forward surge current (8.3 ms half-sine). Its -55°C to +175°C operating range supports deployment in harsh automotive and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W - Sustains single 1.0 ms transient without failure; defines maximum energy absorption capability. |
| Reverse Standoff Voltage | 342 V min - Maximum continuous DC voltage before significant leakage; sets system operating margin. |
| Breakdown Voltage | 380 V typical - Voltage at which device enters avalanche conduction; triggers clamping action. |
| Max Clamping Voltage | 548 V @ 4.0 A - Upper voltage limit during surge; determines protected circuit's maximum stress level. |
| Peak Pulse Current | 4.0 A - Corresponding current at 548 V clamping; used to size upstream fusing and PCB trace width. |
| Operating Temperature | -55°C to +175°C - Enables use in under-hood automotive, industrial motor drives, and outdoor power systems. |
| RoHS Compliance | Lead-free, halogen-free, antimony-free - Meets EU Directive 2015/863/EU; supports green manufacturing requirements. |
Pinout & Package
Package: DO-201 axial-leaded, transfer-molded epoxy (UL 94V-0), 1.12 g weight, tin-finished leads solderable per MIL-STD-202 Method 208. Cathode band identifies polarity on unidirectional version.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-voltage rail; completes shunt path during overvoltage event. |
| Cathode | High-side input terminal | Connected to protected line; carries full surge current to anode during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die | Ensures stable breakdown voltage and low leakage across temperature and lifetime. |
| 1500 W peak pulse rating | Provides high-energy surge immunity compliant with IEC 61000-4-5 Level 4 (4 kV EFT). |
| Fast response time | Sub-nanosecond turn-on protects sensitive ICs before transient propagates into system. |
| DO-201 mechanical robustness | Withstands axial lead bending and thermal cycling; suitable for high-reliability through-hole mounting. |
| RoHS 3 & "Green" compliance | Meets strict environmental mandates without compromising electrical performance or reliability. |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 400 V DC bus in programmable logic controller (PLC) power input stage exposed to load dump and inductive kickback. IC Role / Device Role / Timing Role: Primary shunt TVS protecting upstream rectifier and downstream DC-DC converter ICs. Use Value: Clamps transients to ≤548 V, preventing damage to 600 V-rated MOSFETs and enabling use of lower-cost input capacitors. |
Use Scenario: 12 V battery-fed microcontroller supply rail subjected to ISO 7637-2 pulse 1 and pulse 5a. IC Role / Device Role / Timing Role: Secondary overvoltage clamp after primary LC filter, absorbing residual spikes not attenuated by passive components. Use Value: Maintains <5 µA leakage at 342 V standoff, ensuring minimal quiescent current drain in always-on modules. |
| Telecom Line Interface | Renewable Energy Inverter DC Link |
Use Scenario: RS-485 data line powered from isolated 24 V supply, subject to ESD and induced surges from nearby AC wiring. IC Role / Device Role / Timing Role: Fast-acting voltage limiter placed between transceiver IC and isolation barrier. Use Value: Sub-ns response prevents latch-up in ±15 kV ESD-protected transceivers while maintaining signal integrity. |
Use Scenario: 400 V DC link in solar string inverter exposed to lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Parallel-connected TVS array providing redundancy and distributed clamping across bus terminals. Use Value: 175°C max junction temperature allows direct mounting near heatsinked IGBTs without thermal derating penalties. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ400A | Lower peak power (600 W), smaller SMB package, 558 V clamping at 3.6 A. | Designed for surface-mount board space constraints; less suited for high-energy 1.0 ms pulses. | Select when board area is limited and surge energy is ≤600 W; verify thermal relief for through-hole replacement. |
| 1.5SMC400A | Same 1500 W rating, SMC package, 548 V clamping, but higher leakage (10 µA @ VRWM). | Surface-mount alternative with identical electrical specs but different thermal path and mounting method. | Choose for reflow-compatible designs requiring same clamping performance; validate solder joint reliability under thermal cycling. |
Compared with SMBJ400A and 1.5SMC400A, the 1.5KE400A-T offers superior axial-lead mechanical stability, lower leakage, and proven suitability for high-reliability through-hole production-making it preferred for legacy industrial and automotive platforms where DO-201 is standardized.
Availability
1.5KE400A-T is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, telecom interface protection, and renewable energy inverters requiring stable component supply and long-term obsolescence management.
Supply support for 1.5KE400A-T 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The 1.5KE series belongs to Diodes' transient voltage suppressor portfolio, engineered specifically for high-energy surge protection in industrial, automotive, and telecom infrastructure where reliability under extreme electrical stress is mandatory.
FAQ
Is 1.5KE400A-T still in active production?
No-1.5KE400A-T is marked obsolete in Diodes' DS21503 Rev. 12 (May 2023) as "PART OBSOLETE – CONTACT US" and "OBSOLETE – PART DISCONTINUED". Aetrix Electronics maintains limited legacy stock with full traceability and provides cross-reference support for qualified replacements meeting identical clamping and thermal specifications.
What is the meaning of the "-T" suffix in 1.5KE400A-T?
The "-T" suffix denotes tape-and-reel packaging: 1,000 units per 13-inch reel. This format supports automated through-hole insertion equipment and ensures consistent orientation (cathode band facing designated direction) during placement, critical for process yield in high-volume manufacturing.
How does 1.5KE400A-T differ from the bidirectional 1.5KE400CA-T?
The 1.5KE400A-T is unidirectional with cathode marking and conducts only in reverse avalanche; the 1.5KE400CA-T is bidirectional, lacks polarity marking, and clamps symmetrically for AC-coupled or floating signal lines. Their clamping voltages and thermal ratings are identical, but circuit topology dictates selection.
Can 1.5KE400A-T be used in parallel for higher surge current handling?
Parallel use is not recommended due to mismatch in breakdown voltage (±5% tolerance), causing uneven current sharing and potential thermal runaway. For >4.0 A peak pulse current, Diodes recommends using a single higher-rated device (e.g., 3KP400A) or verified multi-device arrays with matched VBR and thermal coupling.
1.5KE400A-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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):
- 4A
- 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:
- DO-201
1.5KE400A-T FAQ
1.How can I place an order for 1.5KE400A-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE400A-T 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-T reliable?
The price and inventory of 1.5KE400A-T 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-T is usually 5 days.
3.What payment methods are accepted for 1.5KE400A-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE400A-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE400A-T?
1.5KE400A-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE400A-T 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-T?
For technical support, including 1.5KE400A-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE400A-T requirements.
6.How does Aetrix verify that 1.5KE400A-T is sourced from the original manufacturer or authorized distributors?
All 1.5KE400A-T 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-T meets industry standards.
7.What is the process for return or replacement of 1.5KE400A-T?
All 1.5KE400A-T units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE400A-T, 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-T part is unused and in its original packaging.
Return procedure for 1.5KE400A-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE400A-T 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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Diodes Incorporated
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Diodes Incorporated
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