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Toshiba Semiconductor and Storage TCTH012AE,LF(CT
- Part No.:
- TCTH012AE,LF(CT
- Manufacturer:
- Toshiba Semiconductor and Storage
- Category:
- Supervisors
- Package:
- SOT-553
- Datasheet:
-
TCTH012AE,LF(CT.pdf
- Description:
- CMOS LINEAR IC OVER TEMP DETECTI
- Quantity:
- Payment:
- Shipping:
Inventory:7,990
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Product details
Overview
TCTH012AE,LF(CT from Toshiba Electronic Devices & Storage Corporation is an over-temperature detection IC that monitors external PTC thermistors via constant-current excitation (1 μA typ.) and asserts a push-pull FLAG signal when temperature exceeds the threshold set by thermistor selection. It features latch functionality, operates from 1.7–5.5 V supply, consumes only 1.8 μA (typ.), and is housed in a 1.6 mm × 1.6 mm ESV (SOT-553) package. Used in notebook PCs and industrial equipment for thermal safety shutdown.
For engineers reviewing the TCTH012AE,LF(CT datasheet, TCTH012AE,LF(CT pinout, TCTH012AE,LF(CT application, or TCTH012AE,LF(CT equivalent, this page delivers verified specifications including latch-enabled FLAG output, ±8% PTCO current accuracy at 3.3 V, -40°C to +125°C operating range, UVLO at 1.5 V, and detect voltage of 0.50 V (typ.) with 0.1 V hysteresis.
Technical Context
The TCTH012AE,LF(CT implements a precision analog comparator architecture with internal reference and hysteresis (0.1 V), driven by a stable 1 μA (±8%) constant-current source applied to an external PTC thermistor. Its latch function holds the FLAG output low until a RESET signal is asserted, enabling fail-safe thermal monitoring without auto-recovery.
It supports system-level thermal protection through dual ground pins (GND1/GND2), UVLO (1.5 V) for supply integrity, and operation mask time (20 μs typ.) to suppress noise during power-up. The push-pull output drives loads directly without external pull-up, simplifying interface design in space-constrained applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PTCO Output Current | 1.00 μA (typ.), ±8% accuracy at 3.3 V - enables precise thermistor voltage generation for repeatable trip points. |
| Detect Voltage (VDET) | 0.50 V (typ.), 0.36–0.64 V range - sets thermal threshold via external PTC resistance selection. |
| Hysteresis Voltage | 0.1 V - prevents chatter near trip point during slow temperature transitions. |
| Supply Voltage Range | 1.7–5.5 V - compatible with 1.8 V, 3.3 V, and 5 V logic domains without level-shifting. |
| Current Consumption | 1.8 μA (typ.) - minimizes battery drain in portable thermal monitoring systems. |
| Operating Temperature | -40°C to +125°C - suitable for under-hood automotive modules and industrial motor drives. |
| UVLO Threshold | 1.5 V - ensures reliable reset on brown-out, preventing false trips during unstable power-up. |
Pinout & Package
Package: ESV (SOT-553), 1.6 mm × 1.6 mm × 0.55 mm, 5-pin, 2.98 mg weight. All GND pins must be connected to system ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Accepts 1.7–5.5 V; includes UVLO circuitry for supply monitoring. |
| GND1 | Analog ground reference | Reference for PTCO current source and comparator; separate from digital ground path. |
| GND2 | Digital ground reference | Return path for push-pull FLAG driver; improves noise immunity in mixed-signal layouts. |
| PTCGOOD | FLAG signal output | Push-pull active-low output; sinks 4 mA max, drives high without external pull-up. |
| PTCO | Constant-current output | Sources 1 μA (typ.) to external PTC thermistor; voltage at this pin rises with thermistor resistance. |
Key Features
| Feature | Design Value |
|---|---|
| Latch-enabled FLAG output | PTCGOOD remains low after over-temperature detection until RESET is asserted - critical for fault-locking in safety-critical systems. |
| High-accuracy PTCO current | ±8% tolerance at 3.3 V ensures consistent thermistor voltage across units and temperatures - reduces calibration burden. |
| Ultra-low quiescent current | 1.8 μA typical consumption extends battery life in always-on thermal sensors for IoT edge devices. |
| Integrated UVLO and mask timing | 1.5 V UVLO and 20 μs operation mask prevent false triggering during power ramp-up or supply transients. |
| ESV package footprint | 1.6 mm × 1.6 mm area saves PCB space vs. SOT-23 or SC-70 - ideal for thin-profile consumer electronics. |
Applications
| Notebook PC Thermal Protection | Industrial Motor Drive Monitoring |
|---|---|
Use Scenario: Monitors CPU/GPU die temperature via surface-mounted PTC thermistor to trigger system shutdown before thermal throttling occurs. IC Role / Device Role / Timing Role: Over-temperature detection IC with latch function - provides fail-safe, non-recoverable flag until host MCU resets it. Use Value: Prevents silicon damage by enforcing hard thermal cutoff; 1.8 μA current draw avoids measurable impact on battery runtime. | Use Scenario: Detects winding over-temperature in BLDC motor drivers using series-connected PTC thermistors embedded in stator windings. IC Role / Device Role / Timing Role: Latched thermal flag generator - holds fault state during continuous overload, requiring explicit reset after cooling. Use Value: Enables compliance with IEC 60730 Class B thermal protection requirements without software polling or ADC overhead. |
| Home Appliance Control Board | Medical Power Supply Safety |
Use Scenario: Embedded in washing machine control board to monitor heating element and motor controller MOSFET junction temperature. IC Role / Device Role / Timing Role: Standalone thermal watchdog - operates independently of main MCU, ensuring protection even during firmware lockup. Use Value: Eliminates need for microcontroller-based temperature sampling; 0.1 V hysteresis prevents cycling near trip point during thermal soak. | Use Scenario: Safeguards isolated DC-DC converter in Class II medical power supplies by detecting transformer or rectifier overheating. IC Role / Device Role / Timing Role: Isolated thermal monitor - uses single PTC thermistor on secondary side with galvanically isolated FLAG output signaling. Use Value: Meets IEC 60601-1 creepage/clearance requirements via compact ESV package and no external bias components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar over-temperature detection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TCTH012BE,LF(CT | Open-drain FLAG output instead of push-pull; same 1 μA PTCO current and latch function. | Requires external pull-up resistor; better suited for wired-OR fault bus architectures. | Select when interfacing with shared interrupt lines or mixed-voltage systems needing level translation. |
| TCTH022AE,LF(CT | 10 μA PTCO current (vs. 1 μA); identical latch, push-pull, and package. | Supports lower-resistance PTC thermistors (e.g., 1.78 kΩ vs. 17.8 kΩ at 25°C), enabling faster response in high-thermal-mass systems. | Choose when higher PTCO current improves noise immunity or matches existing thermistor families. |
Compared with TCTH012AE,LF(CT, the TCTH012BE,LF(CT offers open-drain flexibility at the cost of added BOM component, while TCTH022AE,LF(CT trades ultra-low current for improved signal-to-noise ratio with lower-value thermistors - both retain identical latch behavior and ESV packaging.
Availability
TCTH012AE,LF(CT is available at Aetrix Electronics and suitable for notebook PC thermal management, industrial motor drive protection, and home appliance control boards requiring stable component supply and long-term lifecycle support.
Supply support for TCTH012AE,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 discrete semiconductors, power devices, and analog ICs for industrial, automotive, and consumer applications.
The TCTH0xxxE series is part of Toshiba's Thermoflagger™ family - purpose-built for low-power, latch-based over-temperature detection using external PTC thermistors in space-constrained and battery-sensitive systems.
FAQ
What is the primary function of the TCTH012AE,LF(CT?
The TCTH012AE,LF(CT is an over-temperature detection IC that uses a 1 μA constant-current source to bias an external PTC thermistor and asserts a latched, push-pull FLAG signal when the resulting voltage exceeds 0.50 V (typ.). It is designed for fail-safe thermal shutdown in portable and industrial electronics where reliability and ultra-low power are essential.
Does the TCTH012AE,LF(CT require an external reset signal to clear its latched FLAG output?
Yes. The TCTH012AE,LF(CT includes a dedicated RESET pin. When RESET is driven high (≥0.84 V), the latched PTCGOOD output returns to high state. This behavior is confirmed in the device's Operation List (Section 8-3) and Application Note 10.2 - the latch remains active until explicit reset, ensuring fault persistence across power cycles if needed.
What is the maximum number of PTC thermistors that can be used with the TCTH012AE,LF(CT?
The TCTH012AE,LF(CT supports up to 30 PTC thermistors connected in series, provided they share identical resistance values at 25°C. This configuration is validated in Section 10.3.2 of the datasheet, which specifies design equations for multi-thermistor networks and warns against mixing dissimilar thermistors to avoid inaccurate trip points.
How accurate is the PTCO current source in the TCTH012AE,LF(CT across temperature and supply voltage?
The PTCO current source in the TCTH012AE,LF(CT is specified at ±8% accuracy at 3.3 V and 25°C, and maintains ±16.7% accuracy across the full operating range (-40°C to +125°C, 1.7–5.5 V). These values are explicitly listed in the Electrical Characteristics table (Section 6) under IPTCO min/max limits for TCTH01xxE variants.
Can the TCTH012AE,LF(CT operate from a 1.8 V supply rail?
Yes. The TCTH012AE,LF(CT has a guaranteed operating supply range of 1.7 V to 5.5 V, fully covering 1.8 V logic rails. Its UVLO threshold is fixed at 1.5 V, ensuring stable startup and operation at 1.8 V without brown-out risk - confirmed in the Operating Ranges table (Section 2) and Absolute Maximum Ratings (Section 1).
TCTH012AE,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:
- 17µs Typical
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- ESV
TCTH012AE,LF(CT FAQ
1.How can I place an order for TCTH012AE,LF(CT through Aetrix?
Please submit a Request for Quotation (RFQ) for TCTH012AE,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 TCTH012AE,LF(CT reliable?
The price and inventory of TCTH012AE,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 TCTH012AE,LF(CT is usually 5 days.
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Once your TCTH012AE,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 TCTH012AE,LF(CT?
For technical support, including TCTH012AE,LF(CT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TCTH012AE,LF(CT requirements.
6.How does Aetrix verify that TCTH012AE,LF(CT is sourced from the original manufacturer or authorized distributors?
All TCTH012AE,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 TCTH012AE,LF(CT meets industry standards.
7.What is the process for return or replacement of TCTH012AE,LF(CT?
All TCTH012AE,LF(CT units undergo pre-shipment inspection (PSI). If there is an issue with TCTH012AE,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 TCTH012AE,LF(CT part is unused and in its original packaging.
Return procedure for TCTH012AE,LF(CT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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