Taiwan Semiconductor Corporation 1V5KE12A

Overview

1V5KE12A from Taiwan Semiconductor is a unidirectional 1500W transient voltage suppressor (TVS) diode in DO-201 package, with 11.4V minimum breakdown voltage (V_BR), 12.6V maximum V_BR, 10.2V reverse stand-off voltage (V_RWM), and 16.7V clamping voltage (V_C) at 90A peak pulse current - used for ESD and lightning surge protection in DC power rails and I/O interfaces.

For engineers reviewing the 1V5KE12A datasheet, 1V5KE12A pinout, 1V5KE12A application, or 1V5KE12A equivalent, key selection criteria include unidirectional polarity, DO-201 mechanical compatibility, 1500W 1ms pulse rating, sub-1μA leakage at 10.2V, and junction temperature range of –55°C to +175°C.

Technical Context

The 1V5KE12A operates as a silicon avalanche diode with glass-passivated junction, designed to clamp transient overvoltages above its reverse stand-off voltage (10.2V) while maintaining low incremental surge resistance. Its fast response time (<1 ns) and stable clamping behavior enable reliable protection of downstream ICs during electrical fast transients (EFT) and inductive switching events.

It is rated for 1500W peak pulse power (10/1000 μs waveform), supports 200A non-repetitive forward surge current (8.3 ms half-sine), and exhibits typical reverse leakage <1 μA at V_RWM, ensuring minimal standby power loss in always-on circuits.

Key Specifications

Pinout & Package

Package: DO-201 axial leaded package with cathode band marking; tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient voltage suppression applications.

Compared with SMBJ12A, the 1V5KE12A delivers 2.5× higher pulse power and axial through-hole mounting; compared with 1N6273A, it is functionally identical but uses Taiwan Semiconductor's proprietary part numbering - both support same design-in and qualification paths.

Availability

1V5KE12A is available at Aetrix Electronics and suitable for industrial power supply protection, automotive body control modules, LED driver overvoltage clamp, and telecom DC feeding interface applications requiring stable component supply and long-lifecycle availability.

Supply support for 1V5KE12A 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs, with ISO 9001 and IATF 16949 certified production.

The 1V5KE series was developed specifically for high-energy transient suppression in automotive, industrial, and telecom infrastructure, emphasizing robustness, tight V_BR tolerance, and extended temperature operation.

FAQ

What is the polarity configuration of the 1V5KE12A?

The 1V5KE12A is a unidirectional TVS diode, with cathode marked by a band on the DO-201 package. It conducts in reverse bias during overvoltage events and blocks forward current up to 200A surge rating. This polarity enables precise clamping on positive-rail transients while preventing unintended conduction during normal operation. The 1V5KE12A must be oriented with cathode toward the protected line and anode to ground.

Does the 1V5KE12A meet RoHS and halogen-free requirements?

Yes, the 1V5KE12A complies with RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. Its molding compound meets UL 94V-0 flammability rating, and its pure tin-plated leads satisfy J-STD-002 solderability standards. These certifications ensure compatibility with lead-free reflow processes and environmentally regulated end markets. The 1V5KE12A documentation confirms full compliance without exemptions.

What is the maximum clamping voltage of the 1V5KE12A under surge conditions?

The 1V5KE12A has a maximum clamping voltage (V_C) of 16.7 V at 90 A peak pulse current (I_PPM) under the standard 10/1000 μs waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during transient events. Designers use this parameter to verify margin against downstream component absolute maximum ratings - for example, ensuring 16.7 V stays below the 20 V rating of a typical 12 V DC-DC controller.

Can the 1V5KE12A be used in bidirectional configurations?

No, the 1V5KE12A is strictly unidirectional. For bidirectional operation, Taiwan Semiconductor specifies the 1V5KE12CA variant (with "C" suffix), which integrates two opposing diodes in series to handle symmetrical transients on AC or floating lines. Using the 1V5KE12A in bidirectional mode risks permanent failure due to forward conduction during negative excursions. Always select 1V5KE12CA or equivalent dual-diode TVS for bipolar applications.

What is the thermal derating behavior of the 1V5KE12A above 75°C ambient?

The 1V5KE12A's steady-state power dissipation derates linearly from 5 W at 75°C ambient to zero at 175°C junction temperature, per Figure 5 in the datasheet. At 100°C ambient, usable power drops to ~3.3 W; at 125°C, it falls to ~1.7 W. This derating applies only to continuous DC power - the 1500W pulse rating remains valid regardless of ambient, as it reflects short-duration energy absorption. Designers must ensure heatsinking or layout allowances accommodate this thermal profile in high-temp enclosures.