Toshiba Semiconductor and Storage TCTH022BE,LF(CT

Overview

TCTH022BE,LF(CT) from Toshiba Electronic Devices & Storage Corporation is a CMOS over-temperature detection IC that monitors external PTC thermistors to generate a latched open-drain FLAG signal upon temperature threshold exceedance. It delivers 10 μA (Typ.) constant-current output to the PTC, consumes 11.3 μA (Typ.) total supply current, and operates across −40 °C to +125 °C with 1.7–5.5 V supply range - deployed in notebook PCs and industrial equipment for thermal safety shutdown.

For engineers reviewing the TCTH022BE,LF(CT) datasheet, TCTH022BE,LF(CT) pinout, TCTH022BE,LF(CT) application, or TCTH022BE,LF(CT) equivalent, key selection criteria include its latched open-drain PTCGOOD output, ±8% PTCO current accuracy at 3.3 V, 0.5 V detect voltage with 0.1 V hysteresis, 17 μs response time, and ESV (SOT-553) package compatibility with space-constrained thermal monitoring nodes.

Technical Context

The TCTH022BE,LF(CT) implements a precision voltage comparator architecture with internal reference and hysteresis, where PTCO current flows through an external PTC thermistor to develop VPTCO; when VPTCO exceeds VDET (0.50 V Typ.), the PTCGOOD output latches low. The RESET pin enables active release of the latch state, supporting fail-safe recovery protocols in embedded thermal management systems.

Its dual-ground-pin layout (GND and GND2) minimizes ground bounce during flag assertion, while UVLO (1.5 V) ensures reliable startup and operation under brown-out conditions. The device supports up to 30 series-connected PTC thermistors, enabling multi-zone thermal sensing with single-IC coordination without external logic.

Key Specifications

Pinout & Package

Package: ESV (SOT-553), 1.6 mm × 1.6 mm × 0.55 mm, 5-pin surface-mount, weight 2.98 mg (Typ.).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar over-temperature detection applications.

Compared with TCTH022BE,LF(CT), the TCTH022AE,LF(CT) offers push-pull convenience but forfeits wired-OR flexibility, while the MAX6503ESA+ trades PTC-based adaptability for fixed-point simplicity and larger footprint - making TCTH022BE,LF(CT) optimal for scalable, space-constrained, multi-thermistor thermal safety architectures.

Availability

TCTH022BE,LF(CT) is available at Aetrix Electronics and suitable for notebook PC thermal management, industrial motor drive protection, and smart home appliance safety systems requiring stable component supply and long-term lifecycle continuity.

Supply support for TCTH022BE,LF(CT) 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 automotive, industrial, and consumer applications, with emphasis on power efficiency, miniaturization, and functional safety.

The TCTH0xxxE series targets compact, ultra-low-power thermal monitoring in space-constrained electronics - engineered specifically to replace discrete thermal protection circuits with integrated, latch-enabled PTC interface ICs.

FAQ

What is the primary function of the TCTH022BE,LF(CT)?

The TCTH022BE,LF(CT) is an over-temperature detection IC that uses an external PTC thermistor to sense thermal events. It sources a precise 10 μA (Typ.) current to the PTC, monitors the resulting voltage, and asserts a latched open-drain FLAG signal (PTCGOOD) when the threshold is exceeded. Its core function is hardware-enforced thermal safety with persistent fault signaling until explicit RESET.

How does the RESET pin operate on the TCTH022BE,LF(CT)?

The RESET pin on the TCTH022BE,LF(CT) is an active-high input that releases the latched PTCGOOD state. When RESET rises above 0.84 V (min), PTCGOOD transitions from low to high-impedance, restoring normal monitoring. This allows controlled system recovery after thermal events - critical for automated restart sequences in industrial controllers and embedded platforms using the TCTH022BE,LF(CT).

What PTC thermistor resistance range is recommended for use with the TCTH022BE,LF(CT)?

For a single PTC thermistor at 25 °C, Toshiba recommends 1.78 kΩ to 2.7 kΩ when α = 50 and β = 10. With N = 10 thermistors in series, the range shifts to 470 Ω to 940 Ω (α = 180, β = 20). These values ensure VPTCO crosses the 0.50 V detect threshold reliably while accommodating PTC tolerance, temperature drift, and VDET margin - all validated for correct operation of the TCTH022BE,LF(CT).

Can the TCTH022BE,LF(CT) drive multiple PTC thermistors, and how many?

Yes, the TCTH022BE,LF(CT) supports up to 30 PTC thermistors connected in series. Its 10 μA PTCO current and 0.50 V detect voltage enable scalable multi-zone thermal sensing - for example, monitoring individual MOSFETs on a power board or heater elements across a smart appliance. The device's electrical characteristics and timing behavior remain valid across this full count, as confirmed in Toshiba's application note for the TCTH022BE,LF(CT).

What is the significance of the ESV package for the TCTH022BE,LF(CT)?

ESV (SOT-553) is a 1.6 mm × 1.6 mm × 0.55 mm 5-pin package used by the TCTH022BE,LF(CT). Its ultra-small footprint enables placement directly adjacent to heat sources - minimizing thermal conduction delay between sensor and monitored component. At just 2.98 mg, it adds negligible thermal mass, preserving PTC response fidelity. This package is essential for modern compact electronics where board space and thermal performance are co-optimized in the TCTH022BE,LF(CT) implementation.