TCKE501UA - 1.7V-5.5V 1A eFuse IC 75mΩ SOT-353F | Toshiba
料号： TCKE501UA ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.62 | $0.62 |
| 10 | $0.52 | $5.20 |
| 100 | $0.38 | $38.00 |
| 500 | $0.29 | $145.00 |
| 1,000 | $0.23 | $230.00 |
TCKE501UA 概述
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.
直接替换替代料： TCKE501UA ——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： TCKE501UA （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：
TCKE501UL
✅ 直接替换✓ 有现货
联系询价
查看数据手册 →TCKE501UA 规格参数
| 功能 | eFuse IC (electronic fuse / hot-swap protection) |
| Number of Channels | 1 |
| 输入电压范围 | 1.7 V to 5.5 V |
| Operating Voltage (Line) | 1.8 V to 5.0 V (typical line voltage) |
| 最大输出电流 | 1.0 A |
| On-Resistance | 75 mOhm (typ) |
| 过流保护 | Adjustable via external resistor |
| Short-Circuit Protection | Yes |
| Thermal Protection | Overheat (thermal shutdown) protection |
| Power Switch | Integrated MOSFET |
| 封装 | SOT-353F (UFV), 5 pins |
| 安装类型 | Surface Mount |
| Operating Temperature Min | -40 C |
| Applications | Consumer equipment, IoT equipment, general purpose power supply |
| Ordering Code (element14) | 5120484 |
| 安装方式 | SMD/SMT |
TCKE501UA 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 input |
| 引脚 4 | ILIM — Overcurrent limit setting pin (external resistor to GND) |
| 引脚 5 | VOUT — Protected output voltage |
典型应用
TCKE501UA 适用于 6 应用s: IoT Device Power-Line Protection, Consumer Equipment Power Supplies, General-Purpose Low-Voltage Rail Hot-Swap, 1.8V Memory and Sensor Rail Protection, USB and Peripheral Port Protection, Battery-Powered Portable Equipment.
IoT Device Power-Line Protection
IoT devices commonly run from 1.8 V, 3.3 V, or 5 V rails feeding low-power radios, sensors, and microcontrollers, where a fault on any rail can cascade through the system. The TCKE501UA fits these rails directly because its 1.7 V to 5.5 V input range covers all three common voltages, and its 75 mΩ on-resistance keeps series loss negligible for low-power loads. Placed in series between the DC-DC converter output and the load, with the ILIM resistor set just above the maximum normal load current, it limits or interrupts current within microseconds during a short or overcurrent event and recovers automatically once the fault clears. This reusable-fuse behavior eliminates field fuse replacement, which matters for sealed or hard-to-service IoT hardware.
推荐
Consumer Equipment Power Supplies
Consumer electronics - set-top boxes, appliances, accessories - require robust, low-cost protection on internal 3.3 V and 5 V rails to survive misbehavior of downstream loads and user-pluggable connectors. The TCKE501UA suits this role with its 1.0 A current capability, adjustable overcurrent threshold set by one external resistor (minimizing BOM count versus discrete MOSFET plus sense-resistor solutions), and integrated short-circuit and thermal shutdown protection. Because it is housed in the compact 5-pin SOT-353F (UFV) package, it fits densely populated consumer PCBs where a discrete protection circuit would not. Toshiba targets this segment explicitly, and the device acts as a reusable fuse so products recover automatically after transient faults rather than requiring service.
推荐
General-Purpose Low-Voltage Rail Hot-Swap
General-purpose boards with hot-pluggable loads - backplane daughter cards, USB-derived 5 V rails, module sockets - need inrush and fault-current control when a load is inserted. The TCKE501UA provides this as a single-input, single-output eFuse IC: the integrated MOSFET soft-limits current during connection, adjustable overcurrent protection trips on sustained faults, and short-circuit protection reacts to hard shorts faster than any discrete fuse. Its 1.8 V to 5.0 V line-voltage operation means one protection design covers 1.8 V, 3.3 V, and 5 V variants of a product family, simplifying sourcing and layout reuse. The 75 mΩ typical on-resistance adds only about 75 mV of drop at the full 1 A load, preserving regulator headroom.
推荐
1.8V Memory and Sensor Rail Protection
Modern DDR memory interfaces, low-voltage sensors, and PMIC output rails increasingly run at 1.8 V, and faults on these rails can destroy expensive SoCs and memories. The TCKE501UA is among the first Toshiba eFuse ICs to support 1.8 V power lines, operating down to 1.7 V input - most older eFuse ICs stop at 2.5 V or higher. Placed between the 1.8 V regulator and the protected load, its 75 mΩ on-resistance drops only about 75 mV at 1 A, preserving the tight tolerance that 1.8 V cores require. Adjustable overcurrent protection lets the designer set a threshold just above worst-case memory refresh or sensor burst current, while short-circuit and thermal protection guard against PCB-level faults.
推荐
USB and Peripheral Port Protection
Ports that users can touch or plug accessories into are the most fault-prone nodes in any system, requiring protection against shorted cables, damaged accessories, and over-current draws. The TCKE501UA protects 5 V port rails up to 1.0 A: on a short circuit its internal protection acts within microseconds, well before connector or PCB damage occurs, and the adjustable overcurrent threshold can be set to the port's rated current with a single ILIM resistor. Thermal shutdown protects the IC itself during sustained faults, and automatic recovery restores the port once the fault is removed - improving user experience versus one-time fuses that need manual replacement.
推荐
Battery-Powered Portable Equipment
Portable battery-operated products chain a charger IC, one or more boost/buck converters, and sensitive loads; a fault anywhere in the chain drains the battery or damages cells. The TCKE501UA protects post-converter rails from 1.8 V to 5 V with minimal penalty in battery life - the 75 mΩ on-resistance wastes only I²R power (about 75 mW at the full 1 A, far less at typical portable loads). Its tiny SOT-353F (UFV) footprint fits tightly packed portable PCBs, and its integrated short-circuit, overcurrent, and thermal protection provides layered defense without discrete components. Adjustable ILIM accommodates the wide load profile of portable devices, from sleep-mode microamps to burst-mode peaks, when paired with appropriate output capacitance.
推荐
推荐产品汇总
工程参考数据： TCKE501UA ——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 | TCKE501UL | TCKE502UA | TCKE502UL |
|---|---|---|---|---|
| Package | SOT-353F (UFV), 5 pins | 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 |
| Current Class | 1.0 A | 1.0 A class | Higher class (502 variant) | Higher class (502 variant) |
| Configuration Suffix | UA | UL | UA | UL |
| Overcurrent Protection | Adjustable (external resistor) | Adjustable (external resistor) | Adjustable (external resistor) | Adjustable (external resistor) |
| Short-Circuit Protection | Yes | Yes | Yes | Yes |
| Target Applications | Consumer, IoT, general-purpose power supply | Consumer, IoT, general-purpose power supply | Consumer, IoT, general-purpose power supply | Consumer, IoT, general-purpose power supply |
| Lifecycle | Active (launched October 2026) | Active (launched October 2026) | Active (launched October 2026) | Active (launched October 2026) |
关键差异点
- 1.7 V minimum operating voltage （对比 TCKE502UA)
- First Toshiba eFuse lineup supporting 1.8 V rails （对比 TCKE501UL)
- 75 mΩ low on-resistance （对比 TCKE502UL)
设计说明
Set the ILIM resistor so the overcurrent threshold sits comfortably above worst-case normal load current (including inrush and burst peaks) but below the level that upstream wiring or connectors can survive. Choosing a threshold too close to normal load current causes nuisance trips, especially with capacitive loads at startup. Consult the ILIM resistor selection table in the Toshiba TCKE5 series datasheet (document did=169171) rather than extrapolating, since the threshold-to-resistor mapping is non-linear in places.
Place a ceramic input capacitor close to VIN/GND and an output capacitor at VOUT to stabilize the internal control loop during fault events, per the TCKE5 datasheet application section. Keep the VIN-to-VOUT path short and wide; although the SOT-353F package is tiny, the 1 A path should use at least one well-connected thermal land for GND. The exposed routing on such a small 5-pin package means trace inductance matters - long thin traces degrade short-circuit response.
Estimated: at full 1 A load with 75 mΩ typical on-resistance, device dissipation is about 75 mW (I²R = 1² × 0.075), which is modest for the SOT-353F package at moderate ambient temperatures. However, during a sustained overcurrent event, dissipation rises sharply until thermal shutdown trips. For higher continuous currents, consider the TCKE502UA/TCKE502UL higher-current class variants or verify junction temperature with the datasheet thermal resistance figures for your PCB stack-up.
合规信息
Ordering part number TCKE501UA,LF(CT) - the LF(CT) suffix denotes the lead-free, halogen-free-style Toshiba Tape and Reel packing code per distributor listings at element14/Farnell. Full compliance declarations should be confirmed on the Toshiba product page.
