ISO7220M — Datasheet Summary, Specs & Alternatives

01 — Overview

This Texas Instruments datasheet covers the ISO7220 and ISO7221 dual-channel digital isolator families, including parts A, B, C, and M variants. The document explains their function in providing up to 4000 V of galvanic isolation for industrial applications like Fieldbus and Modbus. Key performance parameters include signaling rates from 1 Mbps to 150 Mbps, 4 kV ESD protection, low output skew under 1 ns, and operation across a -40°C to 125°C temperature range. It also details supply voltage options of 2.8 V, 3.3 V, or 5 V.

02 — Key specifications

Datasheet parameters

Parameter	Min	Typ	Max	Conditions
quiescent current	1 mA	2 mA	—	Quiescent; VI = VCCor 0 V, no load
output current	—	—	4 mA
supply voltage range	—	150 mV	—
operating temperature	-40 °C	—	125 °C
power dissipation	—	390 mW	—
input capacitance	—	1 pF	—	INat VCC, VI = 0.4 sin (4E6πt)
isolation voltage	—	—	560 V
propagation delay	280 ns	405 ns	475 ns	See Figure 1
rise time	—	1 ns	—	SeeFigure 1
fall time	—	1 ns	—	SeeFigure 1
output voltage high	—	3 V	—	IOH = -4 mA, SeeFigure 1
output voltage low	—	200 mV	400 mV	IOL = 4 mA, SeeFigure 1
cmti	15 GV/s	40 GV/s	—	VI = VCCor 0 V, SeeFigure 3
output count	—	2	—
channel count	—	2	—

03 — Alternatives

Closest matches to ISO7220M

ISO7240C 2.0× higher fall time, 2.0× higher input capacitance, 2.0× higher output voltage low

Si8611 2.6× lower power dissipation, 2.5× higher fall time, 2.5× higher rise time

Si8612B-SV 4.5× higher isolation voltage, 2.6× lower power dissipation, 2.5× higher fall time

Si8230 20.0× higher rise time, 13.5× lower propagation delay, 1.1× higher cmti

ADuM1200AR 10.0× higher rise time, 4.5× higher isolation voltage, 4.0× lower propagation delay

ADuM1201ARZ 10.0× higher rise time, 4.5× higher isolation voltage, 4.0× lower propagation delay

04 — FAQ

Frequently asked questions

What is the channel count of the ISO7220M?

The channel count is 2.

What is the common-mode transient immunity (CMTI) of the ISO7220M when VI = VCCor 0 V, as shown in Figure 3?

The common-mode transient immunity (CMTI) is 40 GV/s when VI = VCCor 0 V, as shown in Figure 3.

What is the fall time of the ISO7220M?

The fall time is 1 ns, as shown in Figure 1.

What is the input capacitance of the ISO7220M?

The input capacitance is 1 pF at VCC with VI = 0.4 sin (4E6πt).

What is the isolation voltage of the ISO7220M?

The isolation voltage is 560 V.

What is the maximum operating temperature for the ISO7220M?

The maximum operating temperature is 125 °C.

What is the output count of the ISO7220M?

The output count is 2.

What is the output current of the ISO7220M?

The output current is 4 mA.