Toshiba Semiconductor and Storage TCKE812NL,RF

Overview

TCKE812NL,RF from Toshiba Electronic Devices & Storage Corporation is a 18 V, 5 A latched eFuse IC with reverse current blocking control, adjustable overcurrent protection (up to 5.0 A), and 15.1 V (typ.) overvoltage clamp. It integrates internal MOSFET switching, thermal shutdown, UVLO, and slew-rate control via external capacitor - designed for high-reliability power rail protection in 12 V systems such as HDD power supplies and battery charging circuits.

For engineers reviewing the TCKE812NL,RF datasheet, TCKE812NL,RF pinout, TCKE812NL,RF application, or TCKE812NL,RF equivalent, this page delivers verified electrical parameters, WSON10B package mapping, real-world protection timing behavior (e.g., 150 ns fast-trip response), latch-mode fault handling, and precise RILIM/CdV/dT design guidance for stable 12 V rail deployment.

Technical Context

The TCKE812NL,RF implements a single-input/single-output eFuse architecture with integrated N-channel power MOSFET and dedicated EFET gate driver for external reverse-blocking FET control. Its protection logic combines adjustable current limiting (via ILIM resistor), fixed 15.1 V overvoltage clamp, and thermal shutdown at 160°C with 20°C hysteresis.

It operates across −40°C to +85°C ambient, supports VIN from 4.4 V to 18.0 V, and uses EN/UVLO pin for dual-function enable control and programmable under-voltage lockout. Fault response is latched - requiring external reset via EN/UVLO low-to-high transition after fault clearance.

Key Specifications

Pinout & Package

Package: WSON10B (3.0 mm × 3.0 mm, 0.7 mm height, 0.5 mm pitch, exposed thermal pad). Compact footprint suitable for space-constrained portable and embedded power modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TCKE812NA,RF, the TCKE812NL,RF provides deterministic fault containment via latching, while versus TPS259472LVR it delivers unique EFET-driven reverse blocking - making it the sole option among these three for applications requiring both latch-mode safety and bidirectional current control.

Availability

TCKE812NL,RF is available at Aetrix Electronics and suitable for hard disk drive power supplies, battery charging circuits, industrial PLC I/O modules, and automotive body control modules requiring stable component supply, long-term lifecycle support, and IEC62368-1 certified protection.

Supply support for TCKE812NL,RF 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 semiconductor solutions for power management, motor control, and interface applications, with emphasis on industrial and computing markets.

The TCKE8xx series was developed specifically for robust, programmable eFuse protection in 12 V and 5 V power distribution networks - targeting applications where fuse replacement is impractical and system-level fault containment is mandatory.

FAQ

What is the overvoltage clamp voltage of the TCKE812NL,RF?

The TCKE812NL,RF features a fixed overvoltage clamp of 15.1 V (typical), with a guaranteed range of 14.11 V to 16.14 V across −40°C to +85°C ambient. This value applies specifically to the TCKE812 variant and is confirmed in Section 11.3 of the official Toshiba datasheet. The TCKE812NL,RF uses this clamp to protect downstream 12 V circuitry from input surges without requiring external components.

How does the latched fault response of the TCKE812NL,RF differ from auto-retry types?

The TCKE812NL,RF enters a latched-off state upon overcurrent, overvoltage, or thermal fault and remains disabled until the EN/UVLO pin is actively cycled from low to high. Unlike auto-retry variants (e.g., TCKE812NA,RF), it does not attempt autonomous recovery. This behavior ensures fault persistence is visible to system firmware and prevents uncontrolled re-energization in hazardous conditions - a key requirement in industrial and automotive safety-critical designs using the TCKE812NL,RF.

Can the TCKE812NL,RF be used without an external MOSFET for reverse current blocking?

Yes, the TCKE812NL,RF functions fully as a standalone eFuse without an external MOSFET. The EFET pin may be left floating if reverse current blocking is not required. When unused, the internal circuitry ignores the EFET driver output, and the device operates normally with forward-only current flow. Reverse blocking is an optional feature enabled only when an N-channel MOSFET is connected to the EFET pin - no penalty in cost, layout, or performance occurs when omitting it for unidirectional applications using the TCKE812NL,RF.

What is the recommended external capacitor value for dV/dT control on the TCKE812NL,RF?

Toshiba specifies CdV/dT values from 1 nF (typ.) to 100 nF (max) for the TCKE812NL,RF. A 1 nF capacitor yields ~4.8 ms typical VOUT ramp time at 12 V input, while open-circuit (no capacitor) gives ~500 μs. Designers select based on load capacitance and inrush sensitivity: 1–10 nF is typical for HDD or battery-charger outputs with ≥100 μF bulk capacitance. The exact value must be validated on the target PCB due to parasitic effects - the TCKE812NL,RF's dV/dT pin tolerates up to 6.0 V and draws only 250 nA.

Does the TCKE812NL,RF require a heatsink in 5 A continuous operation?

No external heatsink is required for the TCKE812NL,RF at 5 A DC in typical applications. With 28 mΩ (typ.) RON, conduction loss is ~700 mW, and the WSON10B package (θJA ≈ 52°C/W on 4-layer FR4) results in ~36°C junction rise above ambient. At 85°C max ambient, junction temperature stays well below the 160°C thermal shutdown threshold. However, board-level copper area under the exposed thermal pad must be ≥100 mm² and connected via ≥4 thermal vias to inner ground planes - this thermal design is mandatory to achieve rated performance with the TCKE812NL,RF.