Toshiba Semiconductor and Storage TCTH022AE,LF(CT

Overview

TCTH022AE,LF(CT from Toshiba Electronic Devices & Storage Corporation is a CMOS over-temperature detection IC that monitors external PTC thermistors and asserts a latched low-level FLAG signal (PTCGOOD) upon threshold exceedance. It delivers 10 μA (Typ.) constant-current output to the PTCO pin, consumes 11.3 μA (Typ.) supply current, operates from 1.7–5.5 V, supports -40 to 125 °C ambient range, and uses push-pull output with RESET-enabled latch release - deployed in notebook PCs and industrial equipment for thermal safety shutdown.

For engineers reviewing the TCTH022AE,LF(CT datasheet, TCTH022AE,LF(CT pinout, TCTH022AE,LF(CT application, or TCTH022AE,LF(CT equivalent, key selection criteria include its 10 μA PTCO drive accuracy (±8 %), 0.5 V detect voltage with 0.1 V hysteresis, 17 μs response time, latch behavior requiring active RESET assertion, and ESV (SOT-553) package compatibility with space-constrained thermal monitoring nodes.

Technical Context

The TCTH022AE,LF(CT implements a precision voltage comparator architecture where the PTCO pin supplies constant current to an external PTC thermistor; rising thermistor resistance elevates PTCO voltage until it crosses the 0.50 V (Typ.) detect threshold (VDET), triggering immediate PTCGOOD low assertion. Its internal latch holds the flag state until RESET is driven high, enabling persistent fault indication without continuous polling.

This device integrates UVLO (1.5 V) for power-rail integrity, features 20 μs operation mask time to suppress noise-induced false triggers, and maintains ±8 % PTCO current accuracy across 1.7–5.5 V supply and -40 to 125 °C - ensuring stable thermal trip points independent of system rail variation or ambient drift.

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 output eliminating external components, while MAX6503ASA+ lacks integrated PTC biasing and latch - making TCTH022AE,LF(CT the only option supporting direct, latch-enabled PTC thermistor interfacing in ultra-low-power space-constrained designs.

Availability

TCTH022AE,LF(CT is available at Aetrix Electronics and suitable for notebook PC thermal management, industrial motor drive protection, and medical power supply safety systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for TCTH022AE,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 and manufactures high-reliability semiconductor solutions for automotive, industrial, and consumer applications, with emphasis on energy efficiency and functional safety.

The TCTH0xxxE series is part of Toshiba's Thermoflagger™ family - purpose-built for standalone, low-power over-temperature detection using external PTC thermistors in space- and power-constrained thermal safety systems.

FAQ

What is the primary function of the TCTH022AE,LF(CT?

The TCTH022AE,LF(CT is a dedicated over-temperature detection IC that sources 10 μA (Typ.) from its PTCO pin to bias an external PTC thermistor. When thermistor resistance rises due to heat, PTCO voltage exceeds 0.50 V (Typ.), causing the push-pull PTCGOOD output to assert low and latch until RESET is activated. It operates from 1.7–5.5 V and supports -40 to 125 °C environments - making TCTH022AE,LF(CT ideal for autonomous thermal shutdown in portable and industrial electronics.

How does the RESET pin function on the TCTH022AE,LF(CT?

The RESET pin on the TCTH022AE,LF(CT is an active-high control that releases the latched PTCGOOD low state. When RESET is driven to ≥0.84 V (min), the PTCGOOD output returns to high level, indicating normal thermal status. This allows manual or system-controlled recovery after fault clearance. The RESET pin draws only 0.04 μA (Typ.), minimizing impact on driving circuitry - a key design feature of the TCTH022AE,LF(CT for low-power applications.

What PTC thermistor resistance range is recommended for use with the TCTH022AE,LF(CT?

For single-PTC use with the TCTH022AE,LF(CT, Toshiba recommends a 25 °C resistance between 1.78 kΩ and 2.7 kΩ when α = 50 and β = 10. This range ensures reliable detection across process and temperature variation, leveraging the device's 10 μA PTCO current and 0.50 V detect threshold. For multi-thermistor configurations (up to 30 pcs), resistance must be scaled per N and α values - full guidance is provided in the TCTH022AE,LF(CT application note section 10.3.

Does the TCTH022AE,LF(CT require external passive components to operate?

No, the TCTH022AE,LF(CT requires no external passive components for basic operation. Its integrated 10 μA PTCO current source, 0.50 V comparator threshold, 0.1 V hysteresis, UVLO (1.5 V), and latch logic eliminate the need for external resistors, capacitors, or comparators. Only the external PTC thermistor connected between PTCO and GND is mandatory - a core advantage of the TCTH022AE,LF(CT for minimizing BOM and layout complexity in thermal monitoring nodes.

What is the thermal response time of the TCTH022AE,LF(CT?

The TCTH022AE,LF(CT achieves a 17 μs (Typ.) response time (tDET1) from PTCO voltage crossing the detect threshold to PTCGOOD assertion. This fast propagation delay enables protection against rapid thermal transients in power semiconductors and processors. The device also includes a 20 μs operation mask time to reject sub-microsecond noise spikes - ensuring robust operation in electrically noisy environments typical of the TCTH022AE,LF(CT target applications.