Toshiba Launches Small-Package eFuse IC Supporting 1.7V Low-Voltage Operation
October 13, 2026
Toshiba Electronic Devices & Storage Corporation
KAWASAKI, Japan—Toshiba Electronic Devices & Storage Corporation ("Toshiba") has launched a lineup of four electronic fuses (eFuse ICs), the TCKE5 Series, that integrate multiple functions for the protection of power supply lines. Shipments start today. The new products operate over an input voltage range of 1.7V to 5.5V and are housed in the small SOT-353F (UFV) package. The lineup consists of four products, "TCKE501UA," "TCKE501UL," "TCKE502UA," and "TCKE502UL."
The miniaturization, enhanced functionality, and lower power consumption of electronic equipment have increased the use of applications that require low-voltage power supplies, including 1.8V power lines. To improve system reliability, protection functions against overcurrent and short-circuit conditions are also required for low-voltage power lines.
TCKE5 Series products feature an operating input voltage range of 1.7V to 5.5V and are the first products in Toshiba's eFuse IC lineup to support 1.8V power lines. This makes them suitable for low-voltage applications, including SD memory cards.
The series is available in the small, low-profile SOT-353F (UFV) package, which helps reduce PCB mounting area and contributes to space-saving and high-density designs for products such as wearable and IoT devices.
In addition to the short-circuit protection provided by physical fuses, such as glass tube fuses and chip current fuses, the TCKE5 Series incorporates overcurrent protection that shuts off output when overcurrent is detected. The overcurrent detection threshold (IOCP) can be set using an external resistor (RILIM), enabling protection levels to be configured to meet system requirements. Overcurrent protection also includes a mask time[1] that helps prevent unnecessary shutdowns caused by transient peak currents. These features help protect downstream circuits and contribute to improved system safety and reliability.
The product lineup includes both an auto-retry type, where the eFuse IC automatically recovers circuit operation, and a latch type, where recovery is triggered by an external signal, and customers can select the appropriate product for their system configuration. The series also offers products with different slew-rate settings, and customers can choose a device that meets their power sequencing requirements.
Toshiba will further expand its eFuse IC lineup with products that support a wide range of equipment.
Note:
[1] When a current exceeding the overcurrent detection threshold IOCP flows, the output is shut off after the mask time tOCP.
Applications
- Protection of power supply circuits in USB devices, HDMI® devices, laptop PCs and gaming consoles.
Features
- Input voltage operating range: 1.7V to 5.5V, supporting 1.8V, 3.3V, and 5V power lines
- Overcurrent protection mask time: tOCP=2.4ms (typ.)
- Thin and compact SOT-353F package: 2.0×2.1×0.7mm (typ.)
Main Specifications
(Unless otherwise specified, VIN=3.3V, RILIM=13.3kΩ, RLOAD=100Ω, CIN=COUT=1μF, Ta=25°C)
| Part number | TCKE501UA | TCKE501UL | TCKE502UA | TCKE502UL | |||
|---|---|---|---|---|---|---|---|
| Fault response | Auto-retry | Latched | Auto-retry | Latched | |||
| Absolute maximum rating | Input voltage VIN (V) | -0.3 to 6.0 | |||||
| Operating range | Input voltage VIN (V) | 1.7 to 5.5[2] | |||||
| Operating junction temperature Tj_opr (°C) | -40 to 125 | ||||||
| Output current IOUT (A) | DC | 0 to 1.0 | |||||
| Pulse | 0 to 2.0[3] | ||||||
| Electrical characteristics | On-resistance[4] RON (mΩ) | VIN=1.7 to 5.5V, IOUT=1.0A | Typ. | 75 | |||
| Max | 100 | ||||||
| Overcurrent protection threshold[4] IOCP (A) | RILIM=6.8kΩ, Ta=-40 to 125°C | Min | 0.88 | ||||
| Max | 1.12 | ||||||
| Overcurrent protection mask time[5] tOCP (ms) | IOUT=0 to 1.5A | Typ. | 2.4 | ||||
| Fast trip comparator level[5] ISHORT (A) | Typ. | 2.8 | |||||
| Short circuit response time[5] tSHORT (µs) | IOUT>ISHORT→IOUT=0A | Typ. | 1.3 | ||||
| Switching characteristics[5] | Turn on rise time tR (µs) | VIN=1.8V | Typ. | 400 | 750 | ||
| VIN=3.3V | Typ. | 600 | 1150 | ||||
| VIN=5.0V | Typ. | 800 | 1450 | ||||
| Package | Name | SOT-353F (UFV) | |||||
| Size (mm) | Typ. | 2.0×2.1×0.7 | |||||
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Notes:
[2] Section 16 of the datasheets details precautions to be taken when using the product.
[3] 500μs pulse, duty ratio 2%.
[4] Pulsed testing techniques used during this test maintain a junction temperature approximately equal to ambient temperature.
[5] This parameter is for reference only.
Customer Inquiries:
Analog Device Sales & Marketing Dept.
Tel: +81-44-548-2219
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