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AS273D1D13

Over-Temperature Detector

Astec Semiconductor => Silicon Link 

SEMICONDUCTOR

AS273

Over-Temperature Detector

Features

¥ Programmable to three different

over-temperature thresholds

¥ 2.5 V temperature compensated

bandgap reference trimmed to 1%

¥ Open collector output goes low

on over-temp condition

¥ ±3¡C temperature accuracy

¥ Reference shunt current serves to

program over-temp threshold

¥ Available with 5¡C or 10¡C of

temperature hysteresis

¥ Available in a wide range of over-

temp thresholds to fit most

temperature monitoring

applications

¥ Now available in the SOT-223 for

improved substrate temperature

sensing

Description

The AS273 is a series of programmable over-temperature

detectors. Each is internally composed of a precision 2.5 V

shunt reference, a proportional-to-absolute temperature

thermal sensor, a comparator with controlled hysteresis, and

an open collector output that indicates an over-temp condi-

tion. The threshold for the over-temp signal can be set to any

of three values on a given part by controlling the magnitude

of the reference shunt current.

The AS273 has an excellent absolute temperature accuracy

of ±3¡C for each of the three over-temp thresholds. The low

power dissipation minimizes any temperature sensing errors

due to self-heating. There is either 5¡C or 10¡C of tempera-

ture hysteresis to prevent bouncing when an over-temp con-

dition is removed.

The packaging options available with the AS273 make it

appealing to a wide variety of temperature-sensing applica-

tions. The TO-92 package can be mechanically clamped to a

heat sink to monitor the temperature of power devices. The

8L-SOIC and SOT-223 surface mount packages allow for

temperature sensing in high component density applications.

Pin Configuration Ñ Top view

SOIC (D)

OUT 1

N/C 2

N/C 3

N/C 4

8 VREF

7 DO NOT USE

6 DO NOT USE

5 GROUND

TO-92 (LP)

OUT

GROUND

VREF

SOT-223 (G)

OUT

GROUND

VREF

ASTEC Semiconductor

1

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