TCKE501UL - 1A eFuse IC, 75mΩ, 1.7-5.5V | Toshiba | SOT-353F
MPN： TCKE501UL ✓ 啟用中TCKE501UL 概覽
An eFuse IC is a type of electronic circuit protector that replaces a traditional resettable fuse (PPTC) or discrete fuse circuit in a power distribution path. Within the power management IC hierarchy, the eFuse sits alongside hot-swap controllers and load switches as a protection device: it monitors input current and voltage, and disconnects the load when an overcurrent, short-circuit, or overtemperature event is detected, protecting both upstream supply and downstream load.
Key features of the TCKE5 Series include adjustable overcurrent protection set by an external resistor on the ILIM pin, built-in short-circuit protection with fast response, and overheat (thermal) protection. The 75 mΩ typical on-resistance minimizes voltage drop and power loss at the full 1 A output current. The 1.7 V minimum operating voltage is a differentiating specification, supporting modern 1.8 V power rails used in low-voltage consumer, IoT, and portable designs.
Architecturally, the TCKE5 Series integrates a sensing FET, control logic, and protection circuits in a single low-cost package. The UL suffix denotes the latch-type fault response variant of the family (the UA variant provides the auto-retry behavior), letting designers choose recovery behavior per system policy. Thermal protection shuts the internal FET off if die temperature exceeds the protection threshold, and the device acts as a reusable fuse across repeated fault events.
Typical applications include USB device power-line protection, HDMI equipment, laptop PCs, gaming consoles, IoT equipment, and general-purpose power supplies. Wherever a 1.8 V to 5 V rail feeds an external connector or unprotected load, the TCKE501UL provides compact turnkey fault isolation.
Design consideration: set the overcurrent threshold with the ILIM resistor per the datasheet equation, verify PCB copper area for thermal dissipation at sustained load, and follow the precautions detailed in the manufacturer datasheet for latch-type behavior.
This page adds distributor-style comparison data, drop-in same-family alternatives, and practical design notes not found in the Toshiba datasheet.
直接替換替代品，適用於 TCKE501UL — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： TCKE501UL （相同外形與佔位） — 差異在於 Applications, Overcurrent Protection, Package, On-Resistance, Short-Circuit Protection.
TCKE501UA
✅ 直接替換聯絡詢價
查看資料表 →TCKE501UL 規格
| Product Type | eFuse IC (electronic fuse, high-side) |
| 輸入電壓範圍 | 1.7 V to 5.5 V |
| 輸出電流 (最大) | 1.0 A |
| On-Resistance (Typ) | 75 mΩ |
| 過電流保護 | Adjustable via external ILIM resistor |
| Short-Circuit Protection | Yes (built-in) |
| Thermal Protection | Yes (overheat protection) |
| Fault Response Type | Latch type (UL suffix) |
| 封裝 | SOT-353F (UFV), 5-pin |
| 安裝類型 | Surface Mount |
| Applications | Consumer equipment, IoT equipment, general purpose power supply |
| Series | TCKE5 Series |
TCKE501UL 腳位配置
| 腳位 1 | VIN — Input supply voltage, 1.7 V to 5.5 V |
| 腳位 2 | GND — Ground |
| 腳位 3 | EN — Enable control input |
| 腳位 4 | ILIM — Overcurrent threshold setting (external resistor) |
| 腳位 5 | VOUT — Protected output voltage |
典型應用
TCKE501UL 適用於 6 應用s: USB Device Power-Line Protection, IoT Equipment Power Rails, Laptop PC and Notebook Rail Protection, Gaming Console Peripherals Protection, HDMI Device Power Protection, General Purpose Power Supply Protection.
USB Device Power-Line Protection
The TCKE501UL fits USB port protection because its 1.7 V to 5.5 V input range covers the 5 V VBUS rail and its adjustable overcurrent limit can be set to match the USB port specification with a single ILIM resistor. The 75 mΩ typical on-resistance limits the series voltage drop to roughly 75 mV at the full 1 A load, preserving voltage headroom at the far end of the cable. The built-in short-circuit protection reacts immediately when a connector pin is accidentally shorted to ground, and the latch-type UL behavior keeps the port disabled until the fault is cleared by the host, preventing repeated inrush events into a damaged cable.
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IoT Equipment Power Rails
IoT devices frequently run from single-cell lithium batteries or 1.8 V rail subsystems, and the 1.7 V minimum operating voltage of the TCKE501UL is a headline advantage here, as many legacy eFuse ICs cannot start at such low input levels. Placed between the battery or DC-DC output and the wireless module or sensor load, the eFuse isolates faults on external sensor connectors without dropping the main rail. The 75 mΩ on-resistance keeps quiescent loss low, an estimated 75 mW at full 1 A load, which matters for thermally constrained wearables and battery-powered nodes. Thermal shutdown adds a second protection layer for enclosed, passively cooled IoT hardware.
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Laptop PC and Notebook Rail Protection
Laptop PCs contain numerous low-voltage rails (1.8 V, 3.3 V, 5 V) feeding external-accessible connectors such as USB, HDMI, and card slots. The TCKE501UL provides hot-plug fault isolation on these rails: adjustable overcurrent via the ILIM resistor, immediate short-circuit disconnect, and overheat protection guard against damage from shorted peripherals. The small SOT-353F (UFV) footprint suits the dense board layouts of thin notebook designs, and the latch-type response lets the embedded controller (EC) detect and log fault events before re-enabling the rail, supporting structured service diagnostics rather than silent auto-retry loops.
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Gaming Console Peripherals Protection
Gaming consoles expose multiple external ports - front USB, controller charging ports, and accessory connectors - that are frequent fault entry points. Toshiba explicitly lists gaming consoles among TCKE5 Series applications. The TCKE501UL protects the 5 V peripheral supply: when a damaged accessory or foreign object shorts the port, the built-in short-circuit protection disconnects within microseconds-class response, and overheat protection prevents the internal FET from being destroyed during prolonged faults. The 1 A capability suits charging and accessory rails, while the adjustable ILIM threshold allows per-port current budgeting so one faulty port does not steal capacity from others.
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HDMI Device Power Protection
HDMI sources must supply 5 V power on the +5V pin of the HDMI connector for downstream EDID access and powering of adapters. This pin is exposed to hot-plug events and cable faults, making it a classic eFuse application. The TCKE501UL placed in series with the HDMI +5V output provides adjustable overcurrent protection matched to the HDMI current budget, fast short-circuit disconnect, and thermal protection. Its 75 mΩ on-resistance maintains the 5 V level within tolerance at the connector, and the SOT-353F package fits the tight space near TV, monitor, or set-top-box HDMI receptacles.
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General Purpose Power Supply Protection
In general-purpose power supplies and modular distribution boards, the TCKE501UL serves as a reusable electronic fuse on 1.8 V to 5 V branch rails. Unlike a one-time fuse, it survives repeated fault events; unlike a PPTC, its trip point is set precisely by the ILIM resistor rather than drifting with ambient temperature. The 1.7 V to 5.5 V input range lets one protection part serve multiple rail voltages across a product family, simplifying the bill of materials. The latch-type fault behavior supports systems with a supervisor or microcontroller that wants to count faults and re-enable the rail under firmware control.
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推薦產品摘要
工程參考資料，適用於 TCKE501UL — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | TCKE501UA | TCKE502UL | TCKE502UA |
|---|---|---|---|---|
| Package | SOT-353F (UFV) | 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 |
| Fault Response | Latch type | Auto-retry | Latch type | Auto-retry |
| Adjustable OC Protection | Yes (ILIM resistor) | Yes (ILIM resistor) | Yes (ILIM resistor) | Yes (ILIM resistor) |
| Thermal / Short Protection | Yes / Yes | Yes / Yes | Yes / Yes | Yes / Yes |
主要差異化特點
- 1.7 V minimum operating voltage (對比Many legacy eFuse ICs (5 V-class only))
- Latch-type fault isolation with low 75 mΩ on-resistance (對比TCKE501UA (auto-retry))
- Turnkey protection integration in 5 pins (對比TCKE502UL / TCKE502UA)
設計說明
Choose latch (UL) versus auto-retry (UA) behavior deliberately. In the latch-type TCKE501UL, a fault disables the output until power is cycled or EN is toggled; systems that expect autonomous recovery must use the TCKE501UA instead. Also note the datasheet specifies the TCKE5 line input as 1.8 V to 5.0 V in the description section while the launch specification states 1.7 V to 5.5 V operating range - use the datasheet electrical characteristics table for design limits. Follow Section 16 precautions of the datasheet for layout and application constraints.
Estimated: at the full 1 A load the internal FET dissipates I² × R = 1² × 0.075 Ω = 75 mW, which is modest for the SOT-353F package but must be added to the PCB thermal budget. Set the overcurrent threshold via the ILIM resistor using the equation in the TCKE5 Series datasheet; a too-low threshold causes nuisance trips on capacitive inrush, while a too-high threshold weakens protection of connectors and wiring.
Place the input capacitor close to VIN and the output capacitor close to VOUT to handle the fast short-circuit disconnect transient without large voltage ringing. Route the ILIM resistor away from high-dV/dt nodes and keep the GND return of the ILIM setting shared with the IC ground pin. Provide solid copper to the small SOT-353F footprint - the 1.7 mm-class package relies on the PCB for heat spreading at sustained load currents.
合規資訊
The ,LF(CT suffix at DigiKey indicates lead-free product code convention; explicit RoHS/REACH certificates were not present in the retrieved data - verify on the Toshiba product page.
