INDUSTRY COMPONENT

Thermal shutdown circuit

Thermal shutdown circuit is an electronic protection component that automatically disables a line driver/transceiver when its temperature exceeds a safe threshold to prevent thermal damage.

Component Specifications

Definition
A thermal shutdown circuit is an integrated protection mechanism in line drivers/transceivers that monitors the device's junction temperature using an on-chip temperature sensor. When the temperature rises above a predetermined threshold (typically 150-175°C), the circuit triggers a shutdown sequence that disables the output drivers, interrupts signal transmission, and may activate cooling protocols. This prevents thermal runaway, protects semiconductor components from permanent damage, and ensures system safety during overload conditions or cooling failures.
Working Principle
The circuit operates by comparing a temperature-dependent voltage (generated by a proportional-to-absolute-temperature sensor or thermal diode) against a reference voltage. When the sensor voltage exceeds the reference (indicating overtemperature), a comparator triggers a latch that shuts down the driver circuitry. Some implementations include hysteresis to prevent oscillation near the threshold, requiring the temperature to drop below a recovery point (typically 10-30°C lower) before normal operation resumes.
Materials
Silicon semiconductor substrate with integrated bipolar/CMOS transistors, polysilicon resistors, metal interconnects (aluminum or copper), silicon dioxide insulation, and thermal sensing elements (often PN junctions or thermistors). Package materials include epoxy molding compound, copper leadframes, and thermal pads for heat dissipation.
Technical Parameters
  • Accuracy ±5°C
  • Hysteresis 10-30°C
  • Response Time <1ms
  • Operating Voltage 3.3V or 5V
  • Shutdown Threshold 150-175°C
  • Current Consumption <100μA
Standards
ISO 16750-2, IEC 60747, JESD22-A108

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Thermal shutdown circuit.

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • False triggering from electrical noise
  • Insufficient hysteresis causing oscillation
  • Sensor calibration drift over time
  • Delayed response during rapid temperature rise
FMEA Triads
Trigger: Temperature sensor failure
Failure: No shutdown during overtemperature
Mitigation: Implement redundant sensors and periodic self-test routines
Trigger: Comparator circuit malfunction
Failure: Premature shutdown or failure to trigger
Mitigation: Use fault-tolerant design with watchdog timers
Trigger: Poor thermal coupling
Failure: Inaccurate temperature measurement
Mitigation: Optimize sensor placement and thermal interface materials

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±5°C temperature accuracy across -40°C to +125°C range
Test Method
Thermal chamber testing per IEC 60068-2-14, junction temperature monitoring using thermal diodes or infrared thermography

Buyer Feedback

★★★★☆ 4.7 / 5.0 (21 reviews)

"Impressive build quality. Especially the technical reliability is very stable during long-term operation."

"As a professional in the Computer, Electronic and Optical Product Manufacturing sector, I confirm this Thermal shutdown circuit meets all ISO standards."

"Standard OEM quality for Computer, Electronic and Optical Product Manufacturing applications. The Thermal shutdown circuit arrived with full certification."

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Frequently Asked Questions

What triggers a thermal shutdown in line drivers?

Thermal shutdown activates when the junction temperature exceeds the circuit's programmed threshold, typically due to excessive ambient temperature, high current loads, poor ventilation, or sustained short-circuit conditions.

How does the circuit recover after shutdown?

Most circuits include hysteresis; after shutdown, the device remains disabled until temperature drops below the recovery threshold (typically 10-30°C below shutdown point), then automatically resumes normal operation.

Can thermal shutdown be disabled?

Some devices include programmable disable features, but this is not recommended as it removes critical protection and may void safety certifications.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Thermal Plate Thermal Sink / Housing