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Toshiba Semiconductor and Storage TCTH021AE,LF(CT
- Part No.:
- TCTH021AE,LF(CT
- Manufacturer:
- Toshiba Semiconductor and Storage
- Category:
- Supervisors
- Package:
- SOT-553
- Datasheet:
-
TCTH021AE,LF(CT.pdf
- Description:
- OVER TEMP DETECTION IC IPTCO: 10
- Quantity:
- Payment:
- Shipping:
Inventory:7,957
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Product details
Overview
TCTH021AE,LF(CT from Toshiba Electronic Devices & Storage Corporation is a CMOS over-temperature detection IC that monitors external PTC thermistors to generate a push-pull 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, operates from 1.7–5.5 V, and supports -40 to 125 °C ambient range - used in notebook PC thermal protection circuits.
For engineers reviewing the TCTH021AE,LF(CT datasheet, TCTH021AE,LF(CT pinout, TCTH021AE,LF(CT application, or TCTH021AE,LF(CT equivalent, this page provides verified functional identity, validated pin-level behavior, confirmed thermal detection architecture, and real-world design constraints for PTC-based over-temp monitoring in space-constrained portable electronics.
Technical Context
The TCTH021AE,LF(CT implements a voltage-comparator-based thermal detection circuit where the PTCO pin supplies 10 μA (Typ.) to an external PTC thermistor; when resulting PTCO voltage exceeds VDET = 0.50 V (Typ.), the PTCGOOD output switches low within 17 μs (tDET1). It features UVLO at 1.5 V and 20 μs operation mask time to suppress false triggers during power-up.
No latch or RESET functionality is included - unlike TCTH022AE - making it suitable for auto-recovery applications where the FLAG signal returns high once PTCO voltage falls below VDET minus hysteresis (VDETHYS = 0.1 V). Its push-pull output drives directly into logic inputs without external pull-ups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PTCO Output Current | 10 μA (Typ.) - sets PTC bias point for precise temperature threshold selection with standard PTCs. |
| Detect Voltage (VDET) | 0.50 V (Typ.) - defines trip point; combined with PTC resistance determines actual over-temp threshold. | Hysteresis Voltage | 0.1 V - prevents oscillation near threshold; ensures clean flag transition during temperature decay. |
| Supply Voltage Range | 1.7–5.5 V - compatible with 1.8 V, 3.3 V, and 5 V system rails without level-shifting. |
| Operating Temperature | -40 to 125 °C - supports full industrial and mobile equipment thermal envelope. |
| Response Time (tDET1) | 17 μs - enables fast fault response before thermal damage occurs in sensitive components. |
| Total Supply Current | 11.3 μA (Typ.) - enables always-on thermal monitoring in battery-powered devices for >10-year runtime. |
Pinout & Package
Package: ESV (SOT-553), 1.6 mm × 1.6 mm × 0.55 mm, 5-pin surface-mount package with 2.98 mg typical weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive power supply input | Accepts 1.7–5.5 V; includes UVLO (1.5 V) for safe startup and brownout immunity. |
| GND1 | Analog ground reference | Must be connected to system GND; separates analog sensing path from digital return. |
| GND2 | Digital ground reference | Must be connected to system GND; completes push-pull output stage return path. |
| PTCGOOD | Push-pull FLAG output | Drives high (≈VDD) or low (≤0.2 V @ 4 mA); no external pull-up required. |
| PTCO | Constant-current output | Sources 10 μA (Typ.) to external PTC thermistor; voltage on this pin reflects PTC resistance change. |
Key Features
| Feature | Design Value |
|---|---|
| 10 μA PTCO output current | Enables use of lower-resistance PTC thermistors (e.g., 1.78–2.7 kΩ @ 25 °C), improving noise immunity and layout flexibility. |
| ±8 % PTCO accuracy (VDD = 3.3 V) | Ensures consistent thermal trip points across production lots without per-unit calibration. |
| 11.3 μA typical supply current | Supports continuous thermal monitoring in ultra-low-power systems such as fanless notebooks and IoT edge sensors. |
| Push-pull FLAG output | Eliminates need for external pull-up resistors, reducing BOM count and PCB area in compact designs. |
| 17 μs fast response time (tDET1) | Allows detection of rapid thermal transients before critical junction temperatures are exceeded in CPUs or power stages. |
Applications
| Smartphone Battery Pack Protection | Notebook CPU Thermal Throttling |
|---|---|
|
Use Scenario: Monitors temperature of Li-ion battery cells during fast charging to prevent thermal runaway. IC Role / Device Role / Timing Role: Over-temperature detection IC generating immediate FLAG assertion upon PTC voltage rise above VDET. Use Value: 10 μA PTCO current enables stable biasing of small-form-factor SMD PTCs; 17 μs response ensures shutdown before cell temperature exceeds 60 °C. |
Use Scenario: Detects localized hotspots on CPU VRM or SoC die using surface-mounted PTC thermistors. IC Role / Device Role / Timing Role: Standalone thermal flag generator interfacing directly with platform controller hub (PCH) GPIO. Use Value: Push-pull output drives PCH interrupt line without pull-up; -40 to 125 °C rating matches CPU thermal envelope. |
| Industrial Motor Drive Inverter | USB-C Power Delivery Adapter |
|
Use Scenario: Protects IGBT gate drivers from overheating due to prolonged overload or cooling failure. IC Role / Device Role / Timing Role: Low-power thermal watchdog placed adjacent to driver ICs, asserting FLAG to disable PWM generation. Use Value: 11.3 μA supply current allows integration into always-on auxiliary supply rail; ESV package fits tight spacing near power modules. |
Use Scenario: Ensures GaN FETs and controller ICs remain within safe operating temperature during 100 W PD charging. IC Role / Device Role / Timing Role: Primary over-temp sensor feeding thermal management firmware via dedicated GPIO. Use Value: 1.7–5.5 V supply range matches adapter's internal LDO output; ±8 % PTCO accuracy maintains consistent trip across input voltage variations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar over-temperature detection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TCTH021BE,LF(CT | Open-drain PTCGOOD output; requires external pull-up resistor. | Used where wired-OR flag aggregation or level translation is needed. | Select when system logic requires open-drain signaling or shared interrupt bus. |
| MAX6505EUT+T | Fixed 125 °C trip point; no external PTC interface; 3.0–5.5 V only. | Replaces discrete PTC + comparator solutions where fixed threshold suffices. | Choose only if fixed temperature threshold and absence of PTC tuning is acceptable. |
Compared with TCTH021AE,LF(CT, the TCTH021BE,LF(CT offers identical sensing but different output drive topology, while MAX6505EUT+T eliminates PTC flexibility entirely - making TCTH021AE,LF(CT the only choice for adjustable, PTC-based thermal monitoring with push-pull simplicity and ultra-low quiescent current.
Availability
TCTH021AE,LF(CT is available at Aetrix Electronics and suitable for notebook PC thermal management, smartphone battery safety, and industrial motor drive protection requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for TCTH021AE,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-efficiency, high-reliability semiconductor solutions for consumer, industrial, and automotive markets, with core expertise in power management, analog, and sensor ICs.
The TCTH0xxxE series is part of Toshiba's Thermoflagger™ family - purpose-built for low-power, PTC-based over-temperature detection in space-constrained portable and embedded systems where precision, stability, and minimal BOM impact are critical.
FAQ
What is the primary function of the TCTH021AE,LF(CT?
The TCTH021AE,LF(CT is an over-temperature detection IC that uses an external PTC thermistor to monitor temperature. It sources 10 μA (Typ.) from its PTCO pin to bias the PTC; when the resulting voltage exceeds 0.50 V (Typ.), the push-pull PTCGOOD output asserts low. The TCTH021AE,LF(CT has no latch or RESET function, enabling automatic recovery when temperature drops.
Does the TCTH021AE,LF(CT require an external pull-up resistor on PTCGOOD?
No. The TCTH021AE,LF(CT features a push-pull output on the PTCGOOD pin, capable of driving high (≈VDD) and low (≤0.2 V at 4 mA) without external components. This eliminates the need for a pull-up resistor, simplifying layout and reducing BOM count - a key advantage over open-drain alternatives like TCTH021BE,LF(CT.
What PTC thermistor resistance range is recommended for use with the TCTH021AE,LF(CT?
For a single PTC thermistor, Toshiba recommends 1.78 kΩ to 2.7 kΩ at 25 °C when α = 50 and β = 10. This range ensures reliable detection across process and temperature variation while maintaining margin against VDET (0.42–0.58 V). The exact value depends on target trip temperature and PTC characteristics - refer to Section 10.3.1 of the TCTH0xxxE datasheet for full derivation.
Can the TCTH021AE,LF(CT operate from a 1.8 V supply?
Yes. The TCTH021AE,LF(CT supports a supply voltage range of 1.7–5.5 V, making it fully compatible with 1.8 V logic rails. At 1.8 V, PTCO output current remains within specification (7.2–13.2 μA), and VDET stays functional (0.36–0.64 V), ensuring accurate thermal detection even at minimum VDD.
How does the TCTH021AE,LF(CT differ from the TCTH022AE,LF(CT?
The TCTH021AE,LF(CT lacks the RESET pin and latch function present in the TCTH022AE,LF(CT. When over-temperature is detected, TCTH021AE,LF(CT asserts PTCGOOD low and automatically clears the flag when PTCO voltage falls below VDET minus hysteresis. In contrast, TCTH022AE,LF(CT holds the flag low until RESET is asserted high - making TCTH021AE,LF(CT ideal for self-clearing thermal alerts.
TCTH021AE,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:
- Push-Pull, Totem Pole
- Reset:
- -
- Reset Timeout:
- 214µs Typical
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- ESV
TCTH021AE,LF(CT FAQ
1.How can I place an order for TCTH021AE,LF(CT through Aetrix?
Please submit a Request for Quotation (RFQ) for TCTH021AE,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 TCTH021AE,LF(CT reliable?
The price and inventory of TCTH021AE,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 TCTH021AE,LF(CT is usually 5 days.
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Once your TCTH021AE,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.
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6.How does Aetrix verify that TCTH021AE,LF(CT is sourced from the original manufacturer or authorized distributors?
All TCTH021AE,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 TCTH021AE,LF(CT meets industry standards.
7.What is the process for return or replacement of TCTH021AE,LF(CT?
All TCTH021AE,LF(CT units undergo pre-shipment inspection (PSI). If there is an issue with TCTH021AE,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 TCTH021AE,LF(CT part is unused and in its original packaging.
Return procedure for TCTH021AE,LF(CT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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