FET-based clamp protects 48-V USB PD EPR lines
Semtech’s TDS5311P circuit protection device delivers near-constant clamping voltage for 48-V USB PD EPR applications. A member of the SurgeSwitch family, it protects a single voltage bus or data line operating at up to 53 V in devices and systems requiring industrial-grade reliability.
Unlike conventional TVS diodes, the TDS5311P uses a surge-rated FET as the main electrical overstress (EOS) protection element. It maintains a nearly constant clamping voltage from the first microsecond of a surge event through the maximum rated current across the full −40°C to +125°C industrial temperature range.
The TDS5311P is rated for transient current up to 24 A (8/20 µs) and peak pulse power of 1512 W (8/20 µs). It meets the IEC 61000-4-5 industrial surge standard of ±1 kV (RS = 42 Ω, CS = 0.5 µF), as well as IEC 61000-4-2 ESD withstand levels of ±20 kV (contact) and ±25 kV (air). Typical clamping voltage is 60 V at 24 A (8/20 µs).
Housed in a 2.0×2.0-mm, 6-pin DFN package, the TDS5311P conserves PCB area compared with SMAJ and SMAB packages. Supplied on tape and reel in 3000-unit quantities, the device costs $0.38256 each ($1147.68 per reel).
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