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Taiwan Semiconductor Corporation 1.5KE43A
- Part No.:
- 1.5KE43A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE43A.pdf
- Description:
- TVS 1500W 43.1V 5% UNIDIR DO-201
- Quantity:
- Payment:
- Shipping:
Inventory:3,960
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Product details
Overview
1.5KE43A from Taiwan Semiconductor is a unidirectional 1500W transient voltage suppressor (TVS) diode with a nominal breakdown voltage of 43V, minimum VBR of 40.9V at 1mA test current, maximum clamping voltage of 59.3V at 26A peak pulse current, and DO-201 axial package - designed for automotive and industrial power rail protection against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the 1.5KE43A datasheet, 1.5KE43A pinout, 1.5KE43A application, or 1.5KE43A equivalent, this part delivers verified AEC-Q101 qualification, sub-1ps response to voltage transients, <1μA leakage above 10V, and stable clamping performance across -55°C to +175°C junction temperature range.
Technical Context
The 1.5KE43A operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 40.9–45.2V breakdown range at 1mA. Its low dynamic impedance ensures rapid energy shunting during 10/1000μs surge events, limiting downstream voltage to ≤59.3V at 26A IPP.
It meets ISO 7637-2 immunity requirements for automotive electronics and supports steady-state power dissipation up to 5W at TL = 75°C on 16mm × 16mm copper pads. Polarity is marked by cathode band; forward voltage is 3.5V at 50A for VBR ≤ 200V devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT = 1mA | 40.9V min / 45.2V max - defines precise avalanche initiation threshold under standard test conditions |
| VWM | 36.8V - maximum continuous reverse working voltage before significant leakage begins |
| VC @ IPP = 26A | 59.3V - clamped voltage during 10/1000μs surge, directly limiting protected circuit stress |
| PPK | 1500W - peak pulse power handling capability per JEDEC standard waveform |
| IPP | 26A - maximum non-repetitive peak impulse current it can safely divert |
| Junction Temp Range | -55°C to +175°C - enables deployment in under-hood automotive and high-temp industrial environments |
| Leakage @ VWM | <1μA - ensures minimal standby power loss and signal integrity in always-on systems |
Pinout & Package
Package: DO-201 axial leaded case with pure tin-plated leads, UL 94V-0 molding compound, and cathode band marking for polarity identification. Weight ≈ 0.090g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or lower-potential rail in unidirectional clamp configuration |
| Cathode | Avalanche breakdown terminal | Connected to protected line; conducts when reverse voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| 10/1000μs surge rating | 1500W peak power handling per standardized transient waveform used in ISO 7637-2 compliance |
| Clamping ratio (VC/VBR) | ~1.45 - low ratio ensures tight overvoltage control relative to breakdown threshold |
| Response time | <1.0ps - enables suppression before sensitive ICs experience damaging overvoltage |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive for environmentally constrained applications |
Applications
| Automotive Power Rail Protection | Industrial Motor Drive Inputs |
|---|---|
Use Scenario: Protecting 12V/24V battery-fed ECUs from load dump and alternator switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges exceeding 36.8V. Use Value: Limits transient voltage to ≤59.3V at 26A, preventing damage to MCU, CAN transceivers, and power management ICs. |
Use Scenario: Safeguarding PLC input modules connected to inductive solenoids and contactors. IC Role / Device Role / Timing Role: Standoff device absorbing turn-off spikes from 24V/48V DC coils without affecting normal operation. Use Value: Withstands repetitive 1500W surges while maintaining <1μA leakage, preserving signal accuracy and system uptime. |
| LED Driver Overvoltage Clamp | Telecom Line Interface Protection |
Use Scenario: Shielding constant-current LED drivers from induced surges on long PCB traces or external wiring. IC Role / Device Role / Timing Role: Fast-acting shunt element across driver output to prevent overvoltage failure of MOSFETs and current-sense resistors. Use Value: Sub-1ps response ensures clamping occurs before LED string or driver IC sustains irreversible damage. |
Use Scenario: Front-end protection for RS-485 transceivers exposed to lightning-induced surges on field wiring. IC Role / Device Role / Timing Role: Primary surge limiter on VCC and signal lines, coordinated with secondary GDT or polymer PTC. Use Value: 59.3V clamping voltage aligns with 3.3V/5V transceiver absolute maximum ratings when used with series impedance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43A | Same 43V nominal VBR, but SMC (DO-214AB) surface-mount package; 600W PPK, lower IPP (13.3A) | Designed for space-constrained PCB layouts; lacks AEC-Q101 qualification in standard grade | Select SMBJ43A only if board area is critical and automotive qualification is not required. |
| 1N6286A | Identical electrical specs and DO-201 package; JEDEC type number for same 1.5KE43A device | No functional difference - dual-marking variant used interchangeably in BOMs | 1N6286A is a direct JEDEC-compliant marking of 1.5KE43A; no design change needed. |
Compared with SMBJ43A, the 1.5KE43A offers 2.5× higher surge power (1500W vs. 600W) and AEC-Q101 validation for automotive use; compared with 1N6286A, it is functionally identical - differing only in manufacturer-specific prefix and marking convention.
Availability
1.5KE43A is available at Aetrix Electronics and suitable for automotive ECU protection, industrial motor drive inputs, LED driver overvoltage clamp, and telecom line interface protection requiring stable component supply across extended temperature ranges and high-reliability environments.
Supply support for 1.5KE43A 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global automotive, industrial, and consumer markets since 1979.
The 1.5KE series was developed specifically for high-energy transient suppression in harsh environments - emphasizing AEC-Q101 qualification, robust DO-201 packaging, and consistent clamping performance across wide temperature and surge conditions.
FAQ
What is the breakdown voltage tolerance of the 1.5KE43A?
The 1.5KE43A has a specified breakdown voltage range of 40.9V to 45.2V at 1mA test current, representing ±5% tolerance around the nominal 43V rating. This tight VBR window ensures predictable clamping behavior in overvoltage protection circuits and supports reliable coordination with downstream overvoltage thresholds in systems like automotive ECUs and industrial controllers.
Is the 1.5KE43A suitable for bidirectional transient protection?
No - the 1.5KE43A is a unidirectional TVS diode, intended for clamping positive transients on grounded systems. For bidirectional protection, TSC offers the 1.5KE43CA variant (with "CA" suffix), which provides symmetrical clamping in both polarities. Using the 1.5KE43A in bidirectional configurations risks failure due to forward conduction during negative transients.
Does the 1.5KE43A meet AEC-Q101 requirements?
Yes - the 1.5KE43A is explicitly qualified to AEC-Q101 standards, covering stress tests including high-temperature reverse bias (HTRB), temperature cycling, and electrostatic discharge (ESD). This qualification confirms its suitability for automotive under-hood and body-control module applications where reliability under thermal and electrical stress is mandatory.
What is the maximum clamping voltage of the 1.5KE43A at rated surge current?
The 1.5KE43A exhibits a maximum clamping voltage (VC) of 59.3V at its rated peak pulse current (IPP) of 26A under the 10/1000μs waveform. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during worst-case surge events - critical for ensuring compatibility with 3.3V, 5V, or 12V ICs downstream.
How does the 1.5KE43A compare to the 1.5KE43 in terms of electrical performance?
The 1.5KE43A differs from the base 1.5KE43 by tighter VBR tolerance (40.9–45.2V vs. 38.7–47.3V) and lower leakage current specification. The "A" suffix denotes enhanced parameter grading, resulting in more consistent clamping behavior and improved system-level predictability - especially valuable in safety-critical or high-volume automotive designs where binning reduces test overhead.
1.5KE43A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- 1.5KE
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 36.8V
- Voltage - Breakdown (Min):
- 40.9V
- Voltage - Clamping (Max) @ Ipp:
- 59.3V
- Current - Peak Pulse (10/1000µs):
- 26A
- 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
1.5KE43A FAQ
1.How can I place an order for 1.5KE43A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE43A 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 1.5KE43A reliable?
The price and inventory of 1.5KE43A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE43A is usually 5 days.
3.What payment methods are accepted for 1.5KE43A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE43A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE43A?
1.5KE43A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE43A 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 1.5KE43A?
For technical support, including 1.5KE43A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE43A requirements.
6.How does Aetrix verify that 1.5KE43A is sourced from the original manufacturer or authorized distributors?
All 1.5KE43A 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 1.5KE43A meets industry standards.
7.What is the process for return or replacement of 1.5KE43A?
All 1.5KE43A units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE43A, 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 1.5KE43A part is unused and in its original packaging.
Return procedure for 1.5KE43A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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