Industry Insights
03 Jan 2026
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Toshiba Launches 40V Electronic Fuse (eFuse IC) for Industrial and Consumer Applications
Toshiba Electronic Devices & Storage Corporation (“Toshiba”) has expanded its lineup of electronic fuse (eFuse IC) products with the addition of the 40V “TCKE6 series,” which supports multiple functions required for power line circuit protection. The five newly introduced products are “TCKE601RA,” “TCKE601RL,” “TCKE602RM,” “TCKE603RA,” and “TCKE603RL.” Shipments begin immediately.
The new TCKE6 series provides short-circuit protection similar to standard physical fuses, while also integrating current-limiting and overvoltage protection functions—capabilities not achievable with physical fuses[1], protecting circuits from damage due to overcurrent and overvoltage. When overcurrent or overvoltage occurs at any point in a circuit, these features prevent excessive current or voltage from being applied to downstream integrated circuits. These eFuse ICs also include built-in thermal protection that shuts off immediately in case of abnormal heat generation or sudden short circuits, thereby protecting downstream circuits. Another advantage of eFuse ICs is simplified circuit design. By integrating multiple protection functions into a single device, they reduce the need for discrete components, enabling compact, efficient designs with fewer components and smaller footprint.
The TCKE6 series has a rated voltage of 40V and supports a wide input voltage range from 4.4V to 30V, making it suitable for power management applications such as 5V, 9V, 12V, and 24V systems. With a low on-resistance of just 52mΩ (typical value), it reduces power consumption during operation, contributing to improved energy efficiency. The series uses a compact TSOP6F package (typical dimensions: 2.9mm × 2.8mm), helping to minimize PCB size. These eFuse ICs are widely applicable across various industrial and consumer equipment.
The TCKE6 series includes two types: one equipped with a FLAG function for fault detection and reporting, and another with an enable (EN) function to control eFuse IC operation. Each type offers two recovery operation modes: auto-retry mode, where the eFuse IC automatically recovers, and latch mode, where recovery is triggered by an external signal. Additionally, one product in the series lacks both FLAG and EN functions but allows switching between auto-retry and latch modes via an external signal. This flexible configuration enables users to select the most suitable product based on their system requirements and device size.
Toshiba will continue developing eFuse IC products to meet diverse equipment needs and further expand its product portfolio.
Note:
[1] Refers to glass tube fuses, chip fuses, etc.
Applications
- Industrial equipment: industrial robots, programmable logic controllers, multifunction printers, etc.
- Consumer devices: robotic vacuum cleaners, etc.
Features
- Maximum input voltage: VIN (max) = 40V
- Low on-resistance: RON = 52mΩ (typical) (IOUT=1A)
- Output short-circuit response time: tSHORT = 1μs (typical)
- Simple functional configuration: overcurrent protection, overtemperature protection, short-circuit protection, and slew rate control
- Thin, compact package: TSOP6F (2.9mm × 2.8mm (typical), t = 0.8mm (typical))
Main Specifications
| (Unless otherwise specified, Ta = -40 to 125°C, VIN = 24V) | Part Number | TCKE601RA | TCKE601RL | TCKE602RM | TCKE603RA | TCKE603RL | Recovery Operation Type | Auto-retry | Latch | Switchable | Auto-retry | Latch | Function | FLAG Function | FLAG Function | MODE Function | EN Function | EN Function | Absolute Maximum Ratings | Input Voltage VIN (V) | -0.3 to 40 | Operating Range | Input Voltage VIN (V) | 4.4 to 30 | Junction Temperature Tj_opr (°C) | -40 to 125 | Output Current IOUT (A) | 0 to 2.5 | Electrical Characteristics | On-Resistance
RON (mΩ) | IOUT=1A, RILIM=11kΩ, Ta=25°C | Typical | 52 | Maximum | 90 | Output Limit Current ILIM (A) | RILIM=11kΩ, VIN - VOUT=2V | Minimum | 1.84 | Maximum | 2.98 | Short-Circuit Response Time
tSHORT (μs) | RLIM=11kΩ, RLOAD=100Ω, CIN=COUT=1μF, Ta=25°C | Typical | 1
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