STMicroelectronics P6KE12CA

Overview

P6KE12CA from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode in DO-15 package, designed for IEC 61000-4-2 ESD and IEC 61000-4-4 surge protection in DC power rails and signal lines. It features a 12 V nominal breakdown voltage (V_BR = 11.4–12.6 V), 16.7 A peak pulse current (I_PP) at 10/1000 µs, 21.7 A at 8/20 µs, clamping voltage of 21.2 V (max), and leakage current ≤0.5 µA at 10 V reverse standoff.

For engineers reviewing the P6KE12CA datasheet, P6KE12CA pinout, P6KE12CA application, or P6KE12CA equivalent, key selection criteria include bidirectional clamping capability, 600 W peak pulse power rating (10/1000 µs), junction temperature range up to +175 °C, low dynamic resistance (0.114 Ω), and compliance with IEC 61000-4-2 level 4 (±30 kV contact/air discharge).

Technical Context

The P6KE12CA employs planar junction technology optimized for high-reliability surge suppression in SMPS and industrial control interfaces. Its bidirectional structure enables symmetrical clamping across both polarities without external polarity management, and its low leakage (<0.5 µA at VRM = 10 V) supports stable operation in low-power sensor circuits.

It delivers 600 W peak pulse power at T_j = 25 °C and retains 300 W at T_j = 175 °C, validated per IEC 61000-4-4 level 4 (4 kV), with thermal impedance (Z_th(j-a)) dependent on PCB copper area - e.g., 2.5 °C/W at 3 cm² per lead on FR4.

Key Specifications

Pinout & Package

DO-15 (JEDEC DO-204AC) axial-leaded package with cathode band marking. Body length: 6.05–6.75 mm; lead diameter: 0.71–0.88 mm; overall length: 26–31 mm. Matte tin-plated leads compliant with J-STD-002 and whisker-tested (JESD201 Class 2).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional TVS diode applications.

Compared with SMBJ12CA and 1.5KE12CA, P6KE12CA offers optimal balance of compact DO-15 size, low leakage, and sufficient 600 W surge rating for cost-sensitive industrial and automotive control applications where PCB real estate and thermal mass are constrained.

Availability

P6KE12CA is available at Aetrix Electronics and suitable for industrial sensor interfaces, DC power input protection, and automotive body control modules requiring stable component supply, long-lifecycle support, and traceable sourcing for production programs.

Supply support for P6KE12CA 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering silicon solutions for smart driving, power management, and industrial automation.

P6KE12CA belongs to ST's P6KE series of planar-junction TVS diodes, engineered specifically for high-reliability transient suppression in harsh-environment power and signal lines where low leakage, wide temperature range, and IEC-compliant surge immunity are mandatory.

FAQ

What is the maximum clamping voltage of P6KE12CA under a 10/1000 µs surge?

The maximum clamping voltage (V_CL) of P6KE12CA is 21.2 V when subjected to a 16.7 A peak pulse current with a 10/1000 µs waveform at T_amb = 25 °C. This value is measured across the device terminals and represents the upper limit of voltage imposed on the protected circuit during that specific surge condition.

Is P6KE12CA unidirectional or bidirectional, and how does that affect PCB layout?

P6KE12CA is a bidirectional TVS diode, indicated by the "CA" suffix. Its symmetrical I-V characteristic eliminates the need for polarity-aware placement - it protects both positive and negative transients across the same two terminals. No orientation-dependent routing or additional components (e.g., back-to-back diodes) are required, simplifying layout on differential or floating nets.

Can P6KE12CA be used in reflow soldering processes?

Yes - P6KE12CA is qualified for lead-free reflow soldering per J-STD-020 MSL Level 1. ST recommends a peak profile of 240–245 °C for ≤60 seconds, with ramp rates ≤3 °C/s pre-peak and ≤6 °C/s cooling. The matte tin-plated leads ensure reliable wetting and intermetallic formation without voiding or dewetting.

How does junction temperature affect the breakdown voltage of P6KE12CA?

V_BR increases with junction temperature at a coefficient α_T = 7.8 × 10⁻⁴ /°C. For example, at T_j = 125 °C, V_BR rises by ~0.078 V per °C above 25 °C, resulting in V_BR(125 °C) ≈ 12.0 V + (100 × 0.00078) = 12.078 V - a minor but measurable positive TC critical for precision overvoltage detection margins.