Semtech has introduced the TDS5311P, a SurgeSwitch circuit protection device aimed at USB Power Delivery (PD) Extended Power Range (EPR) designs using 48 V power rails. The part is designed to protect VBus lines operating up to 53 V, targeting USB PD EPR use cases moving beyond consumer chargers into industrial equipment, rugged mobility devices, and high-performance portable systems.
Semtech positions the TDS5311P as a way to address a common protection issue in these higher-voltage USB PD EPR designs: conventional TVS diodes can clamp inconsistently, with clamping voltage varying across surge current levels and temperature. The TDS5311P uses a surge-rated FET architecture from Semtech’s SurgeSwitch family and is specified to maintain a near-constant clamping voltage “from the first microsecond of a surge event through maximum rated current,” across an operating temperature range of -40°C to +125°C.
For engineers, the practical point is predictability. When the clamp point shifts with temperature or surge amplitude, the downstream power path has to be designed for worst-case behavior, which can drive up voltage margins and component stress. A protection device that holds a more consistent clamp level across current and temperature can simplify design limits around the VBus rail, especially when 48 V PD is being used in harsher environments than typical consumer USB-C applications.
The TDS5311P is rated for 1512 W peak pulse power and 24 A peak pulse current, and Semtech says it meets the IEC 61000-4-5 industrial surge standard. The device comes in a 2.0 x 2.0 mm DFN-6 (Dual Flat No-lead) package.
“USB Power Delivery Extended Power Range is bringing 48 V into application environments that demand industrial-grade reliability,” said Tamir Reshef, vice president of product marketing and applications, analog mixed signal and wireless products group at Semtech. “The TDS5311P gives designers the consistent protection behavior those systems require, in a package small enough to fit the space constraints of the devices they’re building.”
Semtech lists the TDS5311P as available now.
Source: Semtech
