6.3.2.2 Drive Capability

A class-A output driver provides a maximum output of 100µA to drive capacitive loads up to 220nF, while

sinking less than 1µA. However, for the best accuracy, load current can be minimized to prevent self-heating

contributions to the total error.

6.3.2.3 Common Mode Transient Immunity (CMTI)

CMTI is the capability of the device to tolerate a rising or falling voltage step on the high-voltage pins without

coupling a significant disturbance to the output signal. The ISOTMP35R device is specified for the maximum

common-mode transition rate under which the output signal does not experience a disturbance greater than

200mV lasting longer than 4µs, as shown in Figure 6-2 with a 65.8kV/µs common-mode input step. Higher edge

rates than the specified CMTI can be supported with sufficient blanking time after common-mode transitions.

Time (



s)

-2

0

2

4

6

8

10

12

14

16

-250

-1.2

0

-0.8

250

-0.4

500

0

750

0.4

1000

0.8

1250

1.2

1500

1.6

TA = 25°C, VDD = 5.0V, VCM = 750V, RLOAD = 15k, CLOAD = 100nF

VCM

VOUT

Figure 6-2. Common-Mode Transient Response

6.3.3 Thermal Response

The SSOP-12 package is designed to maximize the heat flow and minimize the thermal response time from the

TSENSE pins to the temperature sensor, while also providing the 5kVRMS isolation rating (UL 1577).

When evaluating thermal response with a thermal contact device, care must be taken to understand the gradient

established by the heat source in the application. Traditionally, most temperature sensors are characterized

on the basis of a "stirred-liquid" thermal response test, which sees the totality of the device submerged into a

circulated oil bath at an elevated temperature, which typically provides the best possible response the device

yields, having all parts of the device held to the secondary temperature for the purposes of establishing a new

thermal equilibrium point. This style of test is visualized in Stirred Liquid Thermal Response Test, and the results

of this test are presented in Thermal Response (Air-to-Fluid Bath).

T = T

A = 25°C

Outside of bath

Figure 6-3. Stirred Liquid Thermal Response Test

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ISOTMP35R

SNIS244 – SEPTEMBER 2025

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