Toshiba Semiconductor and Storage TCKE903NL,RF

Overview

TCKE903NL from Toshiba Electronic Devices & Storage Corporation is a 23 V input, 4 A single-channel eFuse IC with latched fault response, adjustable overcurrent limit (0.5–4.0 A), 3.87 V typical overvoltage clamp, and 34 mΩ typical ON resistance. It functions as a reusable power-switching protection device in USB VBUS lines, storage power supplies, and battery charging circuits.

For engineers reviewing the TCKE903NL datasheet, TCKE903NL pinout, TCKE903NL application, or TCKE903NL equivalent, key selection considerations include its latched fault behavior (vs. auto-retry variants), WSON8 package constraints, VIN UVLO threshold of 2.35–2.68 V, and external RILIM-based current limit tuning for precise system-level fault margining.

Technical Context

The TCKE903NL implements a high-side N-channel MOSFET switch with integrated protection logic, where EN/UVLO serves dual roles: enable control and externally adjustable under-voltage lockout via resistor divider. Its latched fault mode ensures persistent shutdown after overcurrent, overvoltage, or thermal events until an active-high reset is applied to EN/UVLO.

Protection timing is deterministic: OVC responds in ≤9.0 μs, short-circuit detection triggers in 2.0 μs, and thermal shutdown activates at 155 °C with 20 °C hysteresis. Slew rate control is achieved via external capacitor on dV/dT pin, enabling inrush current management without compromising startup reliability.

Key Specifications

Pinout & Package

Package: WSON8 (2.0 mm × 2.0 mm, 0.8 mm max height), exposed pad required for thermal and electrical grounding.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TCKE903NA and TPS25942L, the TCKE903NL uniquely combines 23 V capability, field-adjustable UVLO, and latched fault behavior in a 2 mm × 2 mm WSON8 package - making it optimal for safety-critical, wide-input, and maintenance-aware designs.

Availability

TCKE903NL is available at Aetrix Electronics and suitable for USB power delivery protection, industrial SSD power management, and battery charging input stage applications requiring stable component supply across long-lifecycle embedded programs.

Supply support for TCKE903NL 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 computing markets, with emphasis on safety-certified protection ICs.

The TCKE9 Series was developed specifically for high-density, high-voltage power path protection in portable and space-constrained electronics - prioritizing configurable fault handling, low RON, and compact WSON8 packaging.

FAQ

What is the overvoltage clamp voltage of the TCKE903NL?

The TCKE903NL features a fixed overvoltage clamp threshold of 3.87 V (typical), with a guaranteed range of 3.64 V to 4.1 V across temperature. This value is specific to the TCKE903NL variant and is designed to protect 3.3 V logic circuits from transient overvoltage on the VOUT rail. The clamp activates within ≤9.0 μs when output voltage exceeds this threshold, limiting energy dissipation and safeguarding downstream components. The TCKE903NL does not support programmable OVC voltage - only resistor-configurable UVLO and current limit.

How does the latched fault response of the TCKE903NL differ from auto-retry versions like TCKE903NA?

The TCKE903NL enters a persistent shutdown state upon detecting overcurrent, overvoltage, short circuit, or thermal fault - and remains latched off until the EN/UVLO pin is actively toggled from high to low and back to high. In contrast, the TCKE903NA automatically attempts recovery after thermal shutdown (55 ms interval). This makes the TCKE903NL suitable for safety-critical applications where uncontrolled restart could risk hardware damage or data corruption. The latch behavior is inherent to the TCKE903NL's silicon configuration and cannot be modified via external components.

What is the minimum and maximum external resistor value for setting overcurrent limit on the TCKE903NL?

The TCKE903NL requires an external resistor (RILIM) between the ILIM pin and GND to set overcurrent limit from 0.5 A to 4.0 A. Per Toshiba's datasheet, RILIM must be between 487 Ω (for ~4.09 A) and 5000 Ω (for ~0.49 A). Values below 487 Ω are prohibited and may cause undefined behavior; open-circuit disables output entirely. The relationship is approximately ILIM ≈ 1985 / (RILIM – 0.04), with deviation increasing below 1 A - so validation at target current is recommended. The TCKE903NL does not support zero-ohm or floating ILIM configurations.

Can the TCKE903NL be used with input voltages above 23 V?

No - the TCKE903NL is rated for continuous operation up to 23.0 V input (VIN), with an absolute maximum rating of 25.0 V. Exceeding 23.0 V violates the specified operating range and risks premature thermal shutdown or accelerated parametric drift. While the absolute maximum rating allows brief 25.0 V exposure (e.g., during transient testing), sustained use above 23.0 V voids reliability guarantees and may trigger immediate OVC clamping or latch-up. For systems with higher nominal rails, consider the TCKE920NL (22.2 V clamp, 23 V max) or alternative architectures with upstream regulation.

Does the TCKE903NL provide quick output discharge (QOD) functionality?

No - the TCKE903NL does not include quick output discharge. Only the "QNA" variants (e.g., TCKE903QNA) integrate a dedicated QOD pin and internal discharge MOSFET. The TCKE903NL lacks both the QOD terminal and associated internal circuitry; therefore, VOUT discharge relies solely on external load and output capacitance decay. If rapid VOUT discharge is required, TCKE903QNA must be selected instead - it provides ~12 Ω internal discharge resistance and supports external resistor tuning. The TCKE903NL's pinout and functional block diagram confirm absence of QOD functionality.