Toshiba Semiconductor and Storage TCKE920NL,RF

Overview

TCKE920NL from Toshiba Electronic Devices & Storage Corporation is a 23 V input, 4 A latched eFuse IC with adjustable overcurrent protection (0.5–4.0 A), 22.2 V overvoltage clamp, and thermal shutdown-designed for USB VBUS line protection, storage power supply circuits, and battery charging systems.

For engineers reviewing the TCKE920NL datasheet, TCKE920NL pinout, TCKE920NL application, or TCKE920NL equivalent, this page delivers verified electrical specs, WSON8 package details, latch-type fault response behavior, IEC62368-1 certification, and real-world design implications for high-density portable electronics.

Technical Context

The TCKE920NL implements a single-channel, high-side MOSFET-based eFuse with integrated protection logic: overvoltage clamping triggers at 22.2 V (typ.), fast short-circuit detection responds in 2.0 μs, and thermal shutdown activates at 155 °C with 20 °C hysteresis. Its EN/UVLO pin supports dual-mode operation-enabling external control or programmable under-voltage lockout via resistor divider.

Unlike auto-retry variants, the TCKE920NL uses latched fault response: upon overcurrent, short circuit, or thermal shutdown, output remains disabled until EN/UVLO is actively toggled low-then-high. Slew rate is externally adjustable via dV/dT pin capacitance (≥3300 pF), enabling precise inrush current control during power-up.

Key Specifications

Pinout & Package

Package: WSON8 (2.0 mm × 2.0 mm × 0.8 mm max), exposed pad required to be connected to GND for thermal stability and EMI performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar eFuse applications.

Compared with TCKE920NL, TPS25942LARVAT offers faster OVC response but cannot support 23 V operation or latched behavior, while RTQ2132BGQW matches voltage range and latch mode but sacrifices current limit programmability-making TCKE920NL uniquely suited for adaptable, high-voltage, safety-critical latched eFuse roles.

Availability

TCKE920NL is available at Aetrix Electronics and suitable for USB-C power delivery protection, industrial SSD power management, and battery charging input stage applications requiring stable component supply across production lifecycles.

Supply support for TCKE920NL includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Toshiba Electronic Devices & Storage Corporation designs high-reliability analog and power semiconductors for industrial, automotive, and consumer applications, with emphasis on safety-certified protection ICs.

The TCKE9 Series targets compact, high-density power path protection-specifically engineered for portable electronics needing reusable, programmable, and standards-compliant eFuse functionality in sub-2 mm² packages.

FAQ

What is the overvoltage clamp threshold of the TCKE920NL?

The TCKE920NL features a fixed overvoltage clamp threshold of 22.2 V (typical), with a guaranteed range of 21.0 V to 23.3 V across −40 °C to +125 °C. This value is specific to the TCKE920NL variant and differs from other members of the TCKE9 series (e.g., TCKE905NL clamps at 5.7 V). The clamp activates within 6.0 μs at 4 A load, limiting energy transfer to downstream circuitry during transients. TCKE920NL maintains this specification without external components.

How does the latched fault response work in the TCKE920NL?

In the TCKE920NL, latched fault response means that once an overcurrent, short circuit, overvoltage, or thermal shutdown event occurs, the output remains disabled indefinitely until the EN/UVLO pin is actively cycled: driven low and then high again. Unlike auto-retry versions, it does not attempt autonomous recovery. This behavior ensures system-level control and prevents unsafe re-engagement during persistent faults. The FLAG pin stays low during the latched state, providing clear status indication to the host controller.

Can the overcurrent limit of the TCKE920NL be adjusted, and what is the valid range?

Yes, the TCKE920NL's overcurrent limit is fully adjustable via an external resistor (R_ILIM) connected between the ILIM pin and GND. Valid R_ILIM values range from 487 Ω to 5000 Ω, corresponding to current limits from 4.0 A down to 0.5 A. For example, 487 Ω sets ~4.09 A (typ.), while 4420 Ω sets ~0.49 A (typ.). The relationship is non-linear and documented in the datasheet's R_ILIM–ILIM curve. R_ILIM < 487 Ω is prohibited and may cause undefined behavior.

What package type and thermal requirements apply to the TCKE920NL?

The TCKE920NL uses the WSON8 package (2.0 mm × 2.0 mm × 0.8 mm max height) with an exposed thermal pad. That pad must be soldered to a PCB GND plane for both thermal dissipation and electrical stability. The device is rated for 2.0 W power dissipation on a standard 4-layer FR4 board (76.2 mm × 114.3 mm × 1.6 mm). Junction temperature must remain ≤125 °C during continuous operation, with thermal shutdown activating at 155 °C to prevent damage. Layout guidelines require adequate copper area under the exposed pad and short, low-inductance VIN/VOUT traces.

Does the TCKE920NL support adjustable slew rate control, and how is it implemented?

Yes, the TCKE920NL supports adjustable slew rate control via the dV/dT pin. Connecting an external capacitor (≥3300 pF) between dV/dT and GND sets the VOUT rise time and limits inrush current during startup. Larger capacitance yields slower slew rates-for example, 3300 pF gives ~11.0 V/ms at 20 V input, while open dV/dT yields ~24.0 V/ms. This feature prevents false triggering of overcurrent protection during capacitive load charging and allows fine-tuning for specific system capacitance and EMI requirements. No resistor is needed; only capacitor value selection matters.