STIEC45: Highly-reliable Transil™ at high temperatures,
IEC 61000-4-5 compliant
The STIEC45 Transil series is designed to protect DC power supply lines according to IEC 61000-4-5. These Transils fully protect PCBs against electrical fast transients (EFT) according to IEC 61000-4-4 and ETS EN 300 386, as well as against electrostatic discharges (ESD), in compliance with IEC 61000-4-2 and MIL STD 883 Method 3015. Using planar technology, the STIEC45 series is intended for high-end equipment and SMPS, especially where low leakage current and high-junction temperature are required, so ensuring reliability and stability over time. The STIEC45 devices are housed in SMC, with a footprint in accordance with the IPC 7351 standard.
Parameters from the datasheet show the compliance of the STIEC45 with the well known
IEC 61000-4-5 standard.
Current derating versus temperature shows the capability of the device to protect applications at high temperature: 410 A @ 150 °C. ST gives this derating curve in current whereas others often only provide a power derating curve with zero watts @ 150 °C.
The temperature effect can also be checked using aT with the following formula:
VBR @ Tj = VBR @ 25 °C x (1 + aT x (Tj – 25))
If the IEC 61000-4-5 surge is not directly applied on the STIEC45, the remaining surge on the protection device may be lower. Dynamic resistance is used to calculate the clamping voltage whatever the surge is, using the following formula:
VCLmax = RD x IPP + VBRmax @ Tj
IEC 61000-4-5 compliance is achieved using a standard footprint according to IPC 7531, while some competitors define a larger footprint loosing the benefits of a compact SMC package.
Datasheet
Format: (297 kb)
Last Updated: 08/12/2009
Pages: 9
Features
Peak pulse current: 500 A (8/20 µs)
High current capability at 150 °C: 410 A (8/20 µs)
Standoff voltage: 24, 26, 28, 30 and 33 V
Low leakage current at 25 °C
Packaged in SMC
Benefits
Compliance with IEC 61000-4-5 :
Level 2: 1 kV under 2 Ω (differential protection)
Level 4: 4 kV under 12 Ω (common mode protection)
Low leakage current at 85°C: 1 µA max (planar technology)
