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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

Toshiba Semiconductor and Storage TCTH021BE,LF(CT

Name: TCTH021BE,LF(CT
Brand: Toshiba Semiconductor and Storage
SKU: TCTH021BE,LF(CT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TCTH021BE,LF(CT

Manufacturer:: Toshiba Semiconductor and Storage

Category:: Supervisors

Package:: SOT-553

Datasheet:: TCTH021BE,LF(CT.pdf

Description:: OVER TEMP DETECTION IC IPTCO: 10

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Product details

Overview

TCTH021BE,LF(CT from Toshiba Electronic Devices & Storage Corporation is a CMOS over-temperature detection IC that monitors external PTC thermistors and asserts an open-drain FLAG signal (PTCGOOD) when temperature exceeds the threshold set by thermistor resistance and 10 μA PTCO output current. It operates from 1.7 V to 5.5 V supply, consumes 11.3 μA typical current, supports -40 °C to 125 °C ambient range, and uses ESV (SOT-553) package for compact thermal sensing in mobile and industrial systems.

For engineers reviewing the TCTH021BE,LF(CT datasheet, TCTH021BE,LF(CT pinout, TCTH021BE,LF(CT application, or TCTH021BE,LF(CT equivalent, this page delivers verified specifications including PTCO output accuracy (±8 %), detect voltage (0.50 V typ.), response time (17 μs), latch-free operation, and open-drain output compatibility with standard pull-up configurations.

Technical Context

The TCTH021BE,LF(CT implements a constant-current source (10 μA typ.) on the PTCO pin to bias external PTC thermistors; detection occurs when resulting PTCO voltage exceeds 0.50 V (VDET), with 0.1 V hysteresis. It features UVLO at 1.5 V and 20 μs operation mask time to suppress false triggers during power-up.

As a non-latching, open-drain device, TCTH021BE,LF(CT outputs low on over-temperature and returns to high-impedance when thermistor resistance drops below threshold-no RESET pin required. Its design targets single-point thermal monitoring where automatic recovery is preferred over latched fault signaling.

Key Specifications

Parameter	Value and Actual Design Meaning
PTCO Output Current	10 μA (typ.), ±8 % accuracy at VDD = 3.3 V - sets precise thermistor bias for stable threshold calibration.
Detect Voltage (VDET)	0.50 V (typ.), 0.36–0.64 V (min–max) - defines trip point for PTCO voltage; determines temperature threshold with selected thermistor.
Supply Voltage Range	1.7 V to 5.5 V - supports wide-input battery-powered and industrial rail systems without external regulation.
Current Consumption	11.3 μA (typ.) - enables ultra-low-power thermal monitoring in always-on subsystems.
Operating Temperature	-40 °C to 125 °C - rated for harsh environments including automotive cabin, industrial motor drives, and computing thermal zones.
Response Time	17 μs (tDET1) - fast detection of rapid thermal transients without software intervention.
Output Type	Open-drain (PTCGOOD) - allows wired-OR fault bus configuration and flexible voltage-level interfacing.

Pinout & Package

Package: ESV (SOT-553), 1.6 mm × 1.6 mm × 0.55 mm, 2.98 mg typical weight, surface-mount compatible with standard reflow profiles.

Pin/Terminal	Circuit Role	Design Meaning
VDD	Power supply input	Accepts 1.7–5.5 V; includes UVLO (1.5 V) to prevent erratic behavior during brown-out.
GND	Ground reference	Single ground terminal; must connect to system GND for accurate PTCO bias and VDET reference.
PTCO	Constant-current output	Sources 10 μA (typ.) to external PTC thermistor(s); voltage at this pin rises with thermistor resistance until VDET is exceeded.
PTCGOOD	FLAG signal output	Open-drain output; pulls low on over-temperature, high-impedance otherwise - requires external pull-up for logic-high state.

Key Features

Feature	Design Value
10 μA precision PTCO current	±8 % accuracy ensures repeatable temperature thresholds across voltage and temperature ranges.
Ultra-low quiescent current	11.3 μA typical consumption enables multi-year battery life in portable thermal monitors.
Fast 17 μs detection response	Minimizes thermal runaway risk in high-dV/dt applications like power converters and motor drivers.
Open-drain PTCGOOD output	Supports shared fault-bus architecture and mixed-voltage system interfacing without level shifters.
No RESET pin required	Auto-recovery operation eliminates need for microcontroller GPIO or external reset circuitry.

Applications

Mobile Device Thermal Protection	Notebook PC CPU/GPU Zone Monitoring
Use Scenario: Real-time temperature monitoring of battery packs and SoC die in smartphones and tablets during fast charging or sustained compute loads. IC Role / Device Role / Timing Role: Over-temperature detection IC providing hardware-level shutdown signal to PMIC or application processor via open-drain PTCGOOD line. Use Value: Prevents thermal damage using 10 μA PTCO current and 17 μs response-enabling immediate throttling before critical junction temperatures are reached.	Use Scenario: Distributed thermal sensing across CPU, GPU, and VRM hotspots in thin-and-light notebooks with space-constrained PCB layouts. IC Role / Device Role / Timing Role: Standalone thermoflag IC interfacing with multiple discrete PTC thermistors to generate localized fault signals without MCU polling. Use Value: ESV package (1.6 mm × 1.6 mm) and auto-recovery behavior reduce BOM count and firmware complexity versus latched alternatives.
Industrial Motor Drive Inverter Protection	Home Appliance Power Module Monitoring
Use Scenario: Monitoring IGBT module heatsink temperature in variable-frequency drives to prevent thermal runaway during overload conditions. IC Role / Device Role / Timing Role: Hardware safety monitor asserting PTCGOOD low to disable gate driver enable lines upon over-temperature event. Use Value: -40 °C to 125 °C operating range and 11.3 μA current ensure reliable operation in sealed enclosures with minimal self-heating impact.	Use Scenario: Detecting overheating in microwave oven magnetron drivers, washing machine motor controllers, and air conditioner inverters. IC Role / Device Role / Timing Role: Low-cost, single-chip thermal flag generator replacing discrete comparator + reference solutions. Use Value: 0.50 V detect voltage and ±8 % PTCO accuracy allow precise 85–110 °C trip points using standard 1 kΩ–10 kΩ PTC thermistors.

Mobile Device Thermal Protection

Notebook PC CPU/GPU Zone Monitoring

Use Scenario: Real-time temperature monitoring of battery packs and SoC die in smartphones and tablets during fast charging or sustained compute loads.

IC Role / Device Role / Timing Role: Over-temperature detection IC providing hardware-level shutdown signal to PMIC or application processor via open-drain PTCGOOD line.

Use Value: Prevents thermal damage using 10 μA PTCO current and 17 μs response-enabling immediate throttling before critical junction temperatures are reached.

Use Scenario: Distributed thermal sensing across CPU, GPU, and VRM hotspots in thin-and-light notebooks with space-constrained PCB layouts.

IC Role / Device Role / Timing Role: Standalone thermoflag IC interfacing with multiple discrete PTC thermistors to generate localized fault signals without MCU polling.

Use Value: ESV package (1.6 mm × 1.6 mm) and auto-recovery behavior reduce BOM count and firmware complexity versus latched alternatives.

Industrial Motor Drive Inverter Protection

Home Appliance Power Module Monitoring

Use Scenario: Monitoring IGBT module heatsink temperature in variable-frequency drives to prevent thermal runaway during overload conditions.

IC Role / Device Role / Timing Role: Hardware safety monitor asserting PTCGOOD low to disable gate driver enable lines upon over-temperature event.

Use Value: -40 °C to 125 °C operating range and 11.3 μA current ensure reliable operation in sealed enclosures with minimal self-heating impact.

Use Scenario: Detecting overheating in microwave oven magnetron drivers, washing machine motor controllers, and air conditioner inverters.

IC Role / Device Role / Timing Role: Low-cost, single-chip thermal flag generator replacing discrete comparator + reference solutions.

Use Value: 0.50 V detect voltage and ±8 % PTCO accuracy allow precise 85–110 °C trip points using standard 1 kΩ–10 kΩ PTC thermistors.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TCTH021AE,LF(CT	Push-pull PTCGOOD output; no external pull-up required; same PTCO current and VDET.	Preferred where active-high logic interface or drive capability into capacitive loads is needed.	Select when system lacks pull-up resistors or requires direct connection to MCU GPIO without external components.
MAX6501UKP+T	Open-drain output, 1.6 V to 5.5 V supply, 1.5 μA supply current, fixed 125 °C threshold (internal sensor).	Integrated silicon temperature sensor; no external PTC thermistor required but less flexible trip-point tuning.	Choose when board space permits internal sensing and fixed threshold suffices; not suitable for remote or multi-point PTC-based monitoring.

Compared with TCTH021BE,LF(CT, the TCTH021AE,LF(CT offers push-pull drive eliminating external pull-ups, while MAX6501UKP+T replaces external PTC networks with monolithic sensing-making TCTH021BE,LF(CT optimal for calibrated, distributed, and adjustable thermal protection using cost-effective PTC elements.

Availability

TCTH021BE,LF(CT is available at Aetrix Electronics and suitable for notebook PC thermal management, mobile equipment battery protection, and industrial motor drive inverter monitoring requiring stable component supply and long-term lifecycle support.

Supply support for TCTH021BE,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 power management, analog, and sensing applications, with global manufacturing and quality certifications.

The TCTH0xxxE series is part of Toshiba's Thermoflagger™ family-engineered specifically for low-power, high-accuracy over-temperature detection using external PTC thermistors in space-constrained consumer and industrial systems.

FAQ

What is the primary function of the TCTH021BE,LF(CT?

The TCTH021BE,LF(CT is an over-temperature detection IC that sources a precise 10 μA current through an external PTC thermistor and asserts a low-level open-drain FLAG signal (PTCGOOD) when the resulting PTCO pin voltage exceeds 0.50 V. It provides hardware-level thermal protection without software intervention and automatically recovers when temperature falls below threshold. The TCTH021BE,LF(CT is designed for compact, low-power applications where reliability and calibration stability are essential.

Does the TCTH021BE,LF(CT require a RESET pin to clear the FLAG signal?

No, the TCTH021BE,LF(CT does not include a RESET pin and operates in auto-retry mode-meaning the PTCGOOD output returns to high-impedance automatically once the PTCO voltage drops below the detect threshold. This behavior distinguishes it from latched variants like TCTH022BE,LF(CT and eliminates the need for external reset circuitry or MCU control. The TCTH021BE,LF(CT is optimized for applications requiring immediate, autonomous thermal recovery.

What is the recommended PTC thermistor resistance range for use with the TCTH021BE,LF(CT at 25 °C?

For a single PTC thermistor, the recommended resistance at 25 °C is 1.78 kΩ to 2.7 kΩ when α = 50 and β = 10, based on the TCTH021BE,LF(CT's 10 μA PTCO current and 0.50 V detect voltage. This range ensures reliable trip-point setting across process and temperature variation. The TCTH021BE,LF(CT datasheet provides extended guidance for multi-thermistor configurations and margining against resistance tolerance and aging effects.

Can the TCTH021BE,LF(CT be used with multiple PTC thermistors in series?

Yes, the TCTH021BE,LF(CT supports up to approximately 30 PTC thermistors connected in series between PTCO and GND, provided they share identical resistance values at 25 °C. The combined resistance determines the trip point, and the TCTH021BE,LF(CT's 10 μA current ensures sufficient sensitivity. Designers must account for worst-case resistance variation and apply appropriate margins per the TCTH021BE,LF(CT application note to avoid false triggering.

What package type and dimensions does the TCTH021BE,LF(CT use?

The TCTH021BE,LF(CT uses the ESV (SOT-553) package: 1.6 mm × 1.6 mm × 0.55 mm footprint with five terminals, optimized for high-density PCB layouts. Its lightweight construction (2.98 mg typical) and standard reflow compatibility make it suitable for automated assembly in consumer and industrial products. The TCTH021BE,LF(CT pinout is fully documented in Toshiba's official datasheet Rev. 2.0.A, including top marking "PC7" for traceability.

TCTH021BE,LF(CT Specifications

Product attributes: Attribute value

Manufacturer:: Toshiba Semiconductor and Storage

Series:: TCTH0xxxE

Package/Case:: SOT-553

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: -

Type:: Thermal

Number of Voltages Monitored:: 1

Voltage - Threshold:: 0.5V

Output:: Open Drain or Open Collector

Reset:: -

Reset Timeout:: 214µs Typical

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: ESV

TCTH021BE,LF(CT FAQ

1.How can I place an order for TCTH021BE,LF(CT through Aetrix?

Please submit a Request for Quotation (RFQ) for TCTH021BE,LF(CT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for TCTH021BE,LF(CT reliable?

The price and inventory of TCTH021BE,LF(CT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TCTH021BE,LF(CT is usually 5 days.

3.What payment methods are accepted for TCTH021BE,LF(CT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TCTH021BE,LF(CT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TCTH021BE,LF(CT?

TCTH021BE,LF(CT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TCTH021BE,LF(CT order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for TCTH021BE,LF(CT?

For technical support, including TCTH021BE,LF(CT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TCTH021BE,LF(CT requirements.

6.How does Aetrix verify that TCTH021BE,LF(CT is sourced from the original manufacturer or authorized distributors?

All TCTH021BE,LF(CT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TCTH021BE,LF(CT meets industry standards.

7.What is the process for return or replacement of TCTH021BE,LF(CT?

All TCTH021BE,LF(CT units undergo pre-shipment inspection (PSI). If there is an issue with TCTH021BE,LF(CT, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The TCTH021BE,LF(CT part is unused and in its original packaging.

Return procedure for TCTH021BE,LF(CT:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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