TMP461 datasheet(27/38 Pages) TI2

27 / 38 page

conversions per second; see the Section 6.5 table for typical values required for these calculations. For a 3.3V

supply and a conversion rate of 16 conversions per second, the TMP461-EP device dissipates 0.531mW (PDIQ

= 3.3V × 161μA) when both the remote and local channels are enabled.

Average Conversion Current

Local ADC Conversion Time

Conversions per Second

Local Active I

Remote ADC Conversion Time

Conversions per Second

Remote Active I

Standby Mode I

Local ADC Conversion Ti

Remote ADC Conversion Time

Conversions per Second

(6)

u ¨

Average Conversion Current

15 ms

240 $

15 ms

400 $

15 $

161 $

(7)

The temperature measurement accuracy of the TMP461-EP device depends on the remote and local

temperature sensor being at the same temperature as the system point being monitored. If the temperature

sensor is not in good thermal contact with the part of the system being monitored, then there is a delay between

the sensor response and the system changing temperature. This delay is typically not a concern for remote

temperature-sensing applications that use a substrate transistor (or a small, SOT23 transistor) placed close to

the device being monitored.

9.2.3 Application Curve

Figure 9-4 shows the step response of the TMP461-EP to a submersion in an oil bath of 100°C from room

temperature (25°C). The time-constant, or the time for the output to reach 63% of the input step, is around 1.1s

for local sensors and 0.6s for the remote diode sensor. The time-constant result depends on the printed-circuit

board (PCB) size that the TMP461-EP is mounted. For this test, the TMP461-EP is soldered to a two-layer PCB

that measures 0.5 inches × 0.5 inches.

Time (s)

-1 0

9 10 11 12 13 14

100

125

Local

Remote

Local: soldered devices on 62mil 2-layer FR4 PCB

Remote: characterized with 2N3906 PNP transistor

Figure 9-4. Temperature Step Response

www.ti.com

TMP461-EP

SNIS241 – SEPTEMBER 2025

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