TCKE502UA - 1.7-5.5V 1A eFuse IC 75mΩ SOT-353F | Toshiba
料号： TCKE502UA ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.55 | $0.55 |
| 10 | $0.48 | $4.80 |
| 100 | $0.38 | $38.00 |
| 500 | $0.32 | $160.00 |
| 1,000 | $0.28 | $280.00 |
TCKE502UA 概述
An eFuse IC is a solid-state circuit-protection device that functions as a resettable, reusable fuse within the power-management IC hierarchy. Unlike a one-time fusible link or a PTC resettable fuse, an eFuse integrates a MOSFET pass element, current-sense circuitry, and control logic in one IC, allowing designers to set precise overcurrent thresholds, block short-circuit faults within microseconds, and shut down on overtemperature. eFuses sit between the power source and the load, guarding hot-swap rails, USB ports, and low-voltage digital supplies.
Key features of the TCKE502UA include adjustable overcurrent protection set by a single external resistor, fast short-circuit protection, thermal shutdown with automatic recovery behavior, and the low 75 mΩ on-resistance that minimizes voltage drop and conduction power loss at the full 1.0 A load. Its 1.7 V minimum input uniquely supports 1.8 V power rails used in modern low-voltage IoT devices, a capability highlighted in Toshiba's October 2026 launch announcement of the TCKE5 series.
The TCKE5 series uses a simple single-channel architecture: the internal N-channel MOSFET pass device is controlled by protection logic, so external circuitry is limited to an ILIM-setting resistor and standard input/output decoupling capacitors. This reduces bill-of-material complexity compared with discrete hot-swap controller plus MOSFET solutions. The SOT-353F package saves board area versus larger eFuse options in WDFN or SOIC packages.
Typical applications include consumer equipment, IoT devices, general-purpose power supplies, 1.8 V and 3.3 V rail protection on microcontroller boards, and hot-swap input protection for battery-powered portable products.
Design consideration: size the external current-limit resistor so the trip threshold sits above the load's worst-case inrush and transient current, and verify thermal margins since 75 mΩ at 1.0 A dissipates an estimated 75 mW.
This page adds information gain by synthesizing distributor availability data (Farnell/element14), the Toshiba TCKE5 datasheet, series-family drop-in alternatives, and practical design notes in one place.
直接替换替代料： TCKE502UA ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： TCKE502UA （相同外形与封装尺寸） ——差异在于 Applications, Overcurrent Protection, Package, On-Resistance, Short-Circuit Protection.
快速对比工具——选择替代料号进行并排对比：
TCKE501UA
✅ 直接替换✓ 有现货
$0.23 / 个
查看数据手册 →TCKE502UA 规格参数
| 功能 | eFuse IC (single-input, single-output) |
| 输入电压范围 | 1.7 V to 5.5 V |
| 最大输出电流 | 1.0 A |
| On-Resistance | 75 mΩ (Typ.) |
| 过流保护 | Adjustable via external resistor |
| Short-Circuit Protection | Yes |
| 热关断 | Yes (overheat protection) |
| 通道数 | 1 |
| 封装 | SOT-353F (UFV), 5-pin |
| 安装类型 | Surface Mount |
| Applications | Consumer equipment, IoT equipment, general-purpose power supply |
| Series | TCKE5 |
TCKE502UA 引脚配置
| 引脚 1 | VIN — Input supply voltage, 1.7 V to 5.5 V |
| 引脚 2 | GND — Ground |
| 引脚 3 | EN — Enable control (on/off) |
| 引脚 4 | ILIM — Overcurrent threshold set via external resistor |
| 引脚 5 | VOUT — Protected output voltage |
典型应用
TCKE502UA 适用于 6 应用s: IoT Device Power-Rail Protection, Hot-Swap Input Protection, Consumer Equipment Power Supplies, General-Purpose Power Supply Rails, Portable and Wearable Electronics, USB Port and Accessory Rail Protection.
IoT Device Power-Rail Protection
Battery-powered and mains-adapter-powered IoT nodes commonly run 1.8 V and 3.3 V digital rails where fault current from a shorted sensor or MCU can damage the supply or drain the battery. The TCKE502UA fits this role because its 1.7 V minimum input supports 1.8 V lines directly - a capability Toshiba highlighted in the October 2026 TCKE5 launch - while 75 mΩ on-resistance keeps the voltage drop at 1.0 A to an estimated 75 mV, preserving margin on tight budgets. Placed between the rail and the load cluster with the ILIM resistor set just above the peak load current, it isolates faults in microseconds and recovers after the fault clears, removing the need for serviceable fuses in sealed IoT enclosures.
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Hot-Swap Input Protection
When a board is inserted into a live backplane or a cable is hot-plugged, inrush current and short-circuit events on the connector can glitch the upstream supply. The TCKE502UA acts as a hot-swap controller per distributor categorization (Farnell/element14: Hot-Swap Controller, eFuse, Adjustable Overcurrent Protection). Its adjustable overcurrent threshold, set by one external resistor, allows controlled fault clearing while the internal 75 mΩ MOSFET adds minimal series loss at loads up to 1.0 A. Place it immediately after the input connector with input and output ceramic decoupling capacitors; the short-circuit protection limits peak fault current faster than any discrete polyfuse can respond, protecting connector pins and upstream regulators.
推荐
Consumer Equipment Power Supplies
Consumer products - set-top boxes, small appliances, chargers, and accessories - require low-cost, small-footprint circuit protection that survives fault events without field service. The TCKE502UA's 5-pin SOT-353F package minimizes PCB area versus DFN or SOIC eFuse alternatives, and its integration of adjustable overcurrent, short-circuit, and thermal shutdown replaces a fuse-plus-thermal-protector combination. With a 1.7 V to 5.5 V input range it protects 3.3 V and 5 V secondary rails derived from AC-DC or DC-DC converters. Estimated conduction loss of only 75 mW at full 1.0 A load keeps self-heating negligible in enclosed consumer housings, improving long-term reliability.
推荐
General-Purpose Power Supply Rails
In general-purpose embedded and industrial power supplies, the TCKE502UA serves as a reusable electronic fuse on 1.8 V, 2.5 V, 3.3 V, and 5 V branch rails, per Toshiba's application scoping (consumer equipment, IoT equipment, general-purpose power supply). The single-resistor ILIM setting lets one PCB design family cover multiple rail current ratings by changing one component value. Thermal shutdown protects the pass MOSFET during prolonged overload, and the low 75 mΩ on-resistance limits regulation impact on downstream DC-DC converters. Design the layout with short, wide traces to the VIN/VOUT pins and place the ILIM resistor close to the IC to avoid noise coupling into the current-sense circuit.
推荐
Portable and Wearable Electronics
Wearables, handheld meters, and portable instruments pack batteries, chargers, and sensitive electronics into small volumes where a faulted peripheral must not drain or damage the battery. The TCKE502UA protects each peripheral rail with semiconductor-speed short-circuit response and a precise adjustable threshold, while the miniature SOT-353F footprint suits high-density flexible and rigid PCBs. Its 1.7 V operation directly covers single-cell boosted 1.8 V logic rails, and the estimated 75 mV drop at 1.0 A preserves usable battery voltage. Because the eFuse resets after the fault clears, end users avoid returning devices for fuse replacement - an important reliability and warranty consideration in sealed portable products.
推荐
USB Port and Accessory Rail Protection
USB VBUS-derived rails (nominally 5 V) and low-voltage accessory ports are frequent fault points due to cable damage and connector debris. The TCKE502UA's 5.5 V maximum input covers 5 V rails with margin, and its resistor-programmable overcurrent trip can be set to USB-class current limits. Short-circuit protection clamps fault energy before upstream switching converters fold back, and thermal shutdown prevents the pass device from overheating during sustained overloads. The 75 mΩ typical on-resistance keeps IR drop on the 5 V line to an estimated 75 mV at 1.0 A, staying well within USB voltage-accuracy budgets at the far end of the cable.
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推荐产品汇总
工程参考数据： TCKE502UA ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | TCKE501UA | TCKE502UL | TCKE501UL |
|---|---|---|---|---|
| Package | SOT-353F (UFV), 5-pin | SOT-353F (UFV) - same | SOT-353F (UFV) - same | SOT-353F (UFV) - same |
| Brand | Toshiba | Toshiba | Toshiba | Toshiba |
| Input Voltage Range | 1.7 V to 5.5 V | 1.7 V to 5.5 V | 1.7 V to 5.5 V | 1.7 V to 5.5 V |
| Maximum Output Current | 1.0 A | 1.0 A | 1.0 A | 1.0 A |
| On-Resistance (Typ.) | 75 mΩ | 75 mΩ | 75 mΩ | 75 mΩ |
| Adjustable Overcurrent | Yes, via external resistor | Yes, via external resistor | Yes, via external resistor | Yes, via external resistor |
| Fault-Response Configuration | UA configuration | UA configuration (same) | UL configuration - differs | UL configuration - differs |
| Thermal Shutdown | Yes | Yes | Yes | Yes |
关键差异点
- 1.7 V minimum input for 1.8 V rails （对比 TCKE501UA)
- Low conduction loss （对比 PTC resettable fuses)
- Fault-response trade-off within family （对比 TCKE502UL)
设计说明
Size the ILIM resistor so the overcurrent trip point sits above the load's worst-case inrush and transient current but below the 1.0 A device maximum, using the selection equation in the Toshiba TCKE5 series datasheet. Estimated conduction loss is 75 mW at full 1.0 A load with 75 mΩ typical on-resistance (P = I²R = 1.0² x 0.075), so thermal design is normally straightforward, but recheck for high ambient temperatures.
Place low-ESR ceramic input and output capacitors as close as possible to the VIN and VOUT pins per the TCKE5 datasheet application circuit, and keep the ILIM resistor trace short and away from switching-noise sources to prevent false overcurrent trips. Use wide, short copper runs for the VIN-to-VOUT current path; the small SOT-353F package relies on trace copper for heat spreading.
Do not confuse the UA and UL suffixes: TCKE5 family parts (TCKE501UA/501UL/502UA/502UL) differ in fault-response behavior such as auto-retry versus latched shutdown, so a pin-compatible substitution may change how the system recovers after a fault. Verify the fault-mode truth table in the datasheet before any substitution, and confirm the enable-pin logic level matches your controller's power-sequencing output.
合规信息
Compliance details not stated in the provided web data. The LF(CT) suffix on distributor listings typically denotes lead-free packaging, but confirm on the official Toshiba product page before relying on it.
