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TCKE501UA - 1.7V-5.5V 1A eFuse IC 75mΩ SOT-353F | Toshiba
The Toshiba TCKE501UA is a 1.0 A single-channel eFuse IC (hot-swap protection IC) operating from a 1.7 V to 5.5 V input range, with a typical on-resistance of 75 mΩ, housed in the compact 5-pin SOT-353F (UFV) surface-mount package. An eFuse IC, or electronic fuse, is an integrated circuit protection device that sits in series with a power rail and replaces a traditional resettable fuse or discrete MOSFET-based hot-swap circuit. Within the power management IC hierarchy, eFuse ICs sit alongside hot-swap controllers and load switches, providing overcurrent, short-circuit, and overtemperature protection in one small footprint, with fast response times that conventional fuses cannot match. Key features of the TCKE501UA include adjustable overcurrent protection set by a single external resistor, integrated short-circuit protection, and thermal shutdown (overheat protection). Its low 75 mΩ typical on-resistance minimizes voltage drop and power loss in the protected rail, while the wide 1.7 V to 5.5 V operating range makes it one of the first Toshiba eFuse ICs to support 1.8 V low-voltage rails alongside 3.3 V and 5 V systems. The 1.0 A maximum output current suits protection of low-power digital loads. The TCKE5 series integrates the power MOSFET, current-sense circuitry, and protection logic on a single die, reducing bill-of-material count versus discrete solutions. During a fault, the internal control loop limits or interrupts current within microseconds, and the device automatically recovers once the fault and thermal condition clear, acting as a reusable fuse. The small SOT-353F package conserves board area in space-constrained designs. Typical applications include consumer equipment, IoT devices, and general-purpose power supplies - for example, protecting 1.8 V DDR or sensor-rail power lines, 3.3 V microcontroller supplies, and 5 V USB-derived rails in battery-powered and mains-powered products. When designing with the TCKE501UA, size the external ILIM resistor for the desired overcurrent threshold per the manufacturer datasheet, and account for the 75 mΩ on-resistance drop at full load (about 75 mV at 1 A). This page synthesizes distributor availability, drop-in same-family alternatives, and practical design notes not found in the manufacturer datasheet.
TCKE712BNL - 13.2V 3.65A eFuse IC, 53mΩ | Toshiba
The Toshiba TCKE712BNL is a 13.2 V input eFuse IC (electronic fuse) with an adjustable overcurrent limit, 53 mΩ typical on-resistance, and a 3.65 A maximum continuous output current, housed in a 10-pin WSON (3x3 mm) package. It functions as a resettable, single-input single-output circuit-protection IC for 4.4 V to 13.2 V power rails. An eFuse IC is a solid-state electronic fuse integrated into a power-management IC: it sits in series with a supply rail and disconnects the load when current, voltage, or temperature conditions exceed safe limits. Unlike a one-time熔 fuse, an eFuse can be re-enabled after a fault, and unlike a hot-swap controller alone it integrates the power MOSFET, sense element, and control logic in one package. eFuses sit in the broader hierarchy of power management ICs, alongside LDO regulators, DC-DC converters, and supervisors, and are a standard building block in server, storage, IoT, and general-purpose power supplies. Key features include an adjustable overcurrent limit set by a single external resistor, short-circuit protection with fast response, programmable inrush (slew rate) control via an external capacitor, and adjustable overvoltage protection with undervoltage lockout. The 53 mΩ on-resistance minimizes series voltage drop and power loss - at a 3 A load the drop is only about 159 mV and dissipation about 0.48 W (estimated: I²R = 3² × 0.053). Technically, the TCKE712BNL is a CMOS silicon-monolithic linear power IC. The integrated back power MOSFET and sense circuitry enable precise current limiting, while the slew-rate control pin allows designers to soft-start capacitive loads and suppress inrush spikes during hot-plug events. Fault behavior (latch-off versus auto-retry) is handled by the BL series variant family, letting designers match protection policy to system requirements. Typical applications include server backplane 12 V rail protection, SSD and hard-disk storage power inputs, IoT equipment and consumer electronics DC inputs, and general-purpose 5 V/12 V power-supply outputs where a resettable fuse with inrush control is required. Design consideration: set the overcurrent limit resistor so the trip point sits above the worst-case load transient but well below the wiring and connector ratings, and choose the slew-rate capacitor for the load capacitance to keep inrush below the OCP threshold during startup. This page synthesizes distributor pricing, same-family drop-in alternatives, comparison tables, and practical eFuse design notes not found in the manufacturer datasheet alone.