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P6KE18CA

600W bidirectional TVS, 18V VBR, 15.3V standoff, DO-15

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Manufacturer Part：

P6KE18CA

Package：

DO-15 (5.80 x 3.60 mm, axial)

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Description

P6KE18CA Overview

The P6KE18CA is a 600W bidirectional transient voltage suppressor (TVS) from STMicroelectronics, 18V standoff voltage, 29.2V clamping voltage, in a DO-15 package, suitable for ESD and surge protection.

Key Features

  • Standoff voltage: 18V
  • Peak power: 600W
  • Breakdown voltage: 20V
  • Clamping voltage: 29.2V
  • Bidirectional protection
  • Leakage current: 1uA

The P6KE18CA is a 600 W peak pulse power bidirectional Transient Voltage Suppressor (TVS) diode in a DO-15 axial leaded package. It provides overvoltage protection for sensitive electronics by clamping transient voltages at 25.2 V with a standoff voltage of 15.3 V. The bidirectional configuration protects against both positive and negative transients, making it suitable for AC line protection and reversible polarity environments. The glass-passivated junction ensures reliable avalanche characteristics and low leakage current of 1 uA at the standoff voltage.

The P6KE18CA operates in the avalanche breakdown mode. Under normal operating conditions (voltage below 15.3 V standoff), the device presents a high impedance with only microamp-level leakage current. When a transient voltage exceeds the breakdown voltage (17.1-18.9 V), the junction enters avalanche breakdown, rapidly diverting surge current away from the protected circuit. The low dynamic impedance during avalanche clamps the voltage to a maximum of 25.2 V at the rated peak pulse current of 24.2 A. After the transient subsides, the device automatically resets to its high-impedance state. The bidirectional structure consists of two opposing Zener junctions, providing symmetrical clamping for both polarity surges. The 600 W rating is based on a 10/1000 us pulse waveform per IEC 61000-4-5.

Pin Name Description
1 Anode/Cathode Bidirectional device; either terminal can serve as anode or cathode depending on transient polarity
2 Cathode/Anode Opposing terminal; bidirectional clamping in both directions

Package: DO-15, axial leaded. Polarity band is typically not present on bidirectional variants (CA suffix). The device can be installed in either orientation.

P6KE18CA uses the DO-15 axial-leaded package, a two-terminal bidirectional TVS device with no polarity distinction — both leads are functionally equivalent. The “CA” suffix denotes bidirectional (symmetric) clamping, meaning the device protects against both positive and negative transients. This contrasts with the unidirectional “A” suffix variant (P6KE18A) which has a defined cathode bar marking. The DO-15 package is rated for 600W peak pulse power (10/1000µs waveform). For surface-mount equivalents, consider SMAJ18CA (400W in SMA) or SMBJ18CA (600W in SMB) with similar clamping characteristics.

  • Power Line Surge Protection: Protecting DC power rails from lightning-induced and switching transients
  • Telecom Line Protection: Bidirectional clamping on tip/ring pairs for SLIC circuits
  • Industrial I/O Protection: Transient suppression on sensor inputs and relay-driven loads
  • AC Mains Cross-Barrier Protection: Secondary side protection in offline power supplies
  • Automotive Load Dump: Suppressing vehicle alternator transients on 12 V battery bus
Model Manufacturer PPP V standoff V clamp Package
P6KE18A Multiple 600 W 15.3 V 25.2 V DO-15 Unidirectional version
SMAJ18CA Littelfuse 400 W 15.3 V 25.4 V SMA SMD alternative, lower power
SMBJ18CA Littelfuse 600 W 15.3 V 26.0 V SMB SMD equivalent
1.5SMC18CA onsemi 1500 W 15.3 V 24.1 V SMC Higher power SMD option
P6KE20CA Multiple 600 W 17.1 V 27.7 V DO-15 Next higher standoff voltage

P6KE18CA is a 600W bidirectional TVS in DO-15 from multiple manufacturers (Littelfuse, ST, Taiwan Semi). The P6KE18A provides unidirectional protection for DC lines. For surface-mount alternatives, SMBJ18CA offers 600W in SMB (DO-214AA) and SMAJ18CA provides 400W in SMA (DO-214AC). The SMCJ18CA delivers 1500W peak pulse power in SMC package for higher surge requirements. For automotive, SMCJ18CAQ provides AEC-Q101 qualification. The 1.5KE18CA offers 1500W in DO-201 for higher energy applications.

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