ISO7421

SOIC (D)

19 mm² 4.9 x 3.9

Highest Signaling Rate: 1 Mbps
Low Power Consumption, Typical I_CC per Channel (3.3-V operation):
- ISO7420: 1.1 mA, ISO7421: 1.5 mA
Low Propagation Delay – 9 ns Typical
Low Skew – 300 ps Typical
Wide T_A Range: –40°C to 125°C (M-Grade)
50-kV/μs Transient Immunity, Typical
Over 25-Year Isolation Integrity at Rated Voltage
Operates From 3.3-V and 5-V Supply and Logic Levels
3.3-V and 5-V Level Translation
Narrow Body SOIC-8 Package
Safety and Regulatory Approvals:
- 4242 V_PK Isolation per DIN V VDE V 0884-10 and DIN EN 61010-1
- 2500 V_RMS Isolation for 1 minute per UL 1577
- CSA Component Acceptance Notice 5A, IEC 60950-1 and IEC 61010-1 Standards
- CQC Certification per GB4943.1-2011

All other trademarks are the property of their respective owners

Highest Signaling Rate: 1 Mbps
Low Power Consumption, Typical I_CC per Channel (3.3-V operation):
- ISO7420: 1.1 mA, ISO7421: 1.5 mA
Low Propagation Delay – 9 ns Typical
Low Skew – 300 ps Typical
Wide T_A Range: –40°C to 125°C (M-Grade)
50-kV/μs Transient Immunity, Typical
Over 25-Year Isolation Integrity at Rated Voltage
Operates From 3.3-V and 5-V Supply and Logic Levels
3.3-V and 5-V Level Translation
Narrow Body SOIC-8 Package
Safety and Regulatory Approvals:
- 4242 V_PK Isolation per DIN V VDE V 0884-10 and DIN EN 61010-1
- 2500 V_RMS Isolation for 1 minute per UL 1577
- CSA Component Acceptance Notice 5A, IEC 60950-1 and IEC 61010-1 Standards
- CQC Certification per GB4943.1-2011

All other trademarks are the property of their respective owners

The ISO7420, ISO7420M and ISO7421 provide galvanic isolation up to 2500 V_RMS for 1 minute per UL. These digital isolators have two isolated channels. Each isolation channel has a logic input and output buffer separated by a silicon dioxide (SiO₂) insulation barrier. Used in conjunction with isolated power supplies, these devices prevent noise currents on a data bus or other circuit from entering the local ground and interfering with or damaging sensitive circuitry. The suffix M indicates wide temperature range (–40°C to 125°C).

These devices have TTL input thresholds and require two supply voltages, 3.3 or 5 V, or any combination. All inputs are 5-V tolerant when supplied from a 3.3-V supply.

Note: The ISO7420 and ISO7421 are specified for signaling rates up to 1 Mbps. Due to their fast response time, under most cases, these devices will also transmit data with much shorter pulse widths. Designers should add external filtering to remove spurious signals with input pulse duration <20 ns if desired.

These devices have TTL input thresholds and require two supply voltages, 3.3 or 5 V, or any combination. All inputs are 5-V tolerant when supplied from a 3.3-V supply.

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Technical documentation

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	Type	Title	Date
*	Data sheet	ISO742x Low-Power Dual-Channel Digital Isolators datasheet (Rev. I)	16 Jul 2015
	White paper	Why are Digital Isolators Certified to Meet Electrical Equipment Standards?	16 Nov 2021
	Certificate	CQC Certification (Rev. G)	19 Aug 2021
	Certificate	VDE Certificate for Basic Isolation for DIN VDE V 0884-11:2017-01 (Rev. S)	03 Aug 2021
	Certificate	CSA Certification (Rev. Q)	14 Jun 2021
	White paper	Distance Through Insulation: How Digital Isolators Meet Certification Requiremen	11 Jun 2021
	User guide	Universal Digital Isolator Evaluation Module	04 Mar 2021
	Certificate	UL Certification (Rev. O)	03 Feb 2021
	White paper	Improve Your System Performance by Replacing Optocouplers with Digital Isolators (Rev. A)	07 Dec 2020
	Technical article	How to select the right digital isolator for your design	21 Oct 2020
	Technical article	Why signal isolation matters in 48-V HEV/EV systems	20 Nov 2019
	Technical article	Staying on budget: How digital isolators are transforming field transmitters	24 May 2019
	Technical article	What are isolated digital inputs?	08 Mar 2019
	User guide	Dual-Channel Digital Isolator EVM (Rev. D)	08 Jul 2013

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

DIGI-ISO-EVM — Universal digital isolator evaluation module

DIGI-ISO-EVM is an evaluation module (EVM) used to evaluate any of the TI single-channel, dual-channel, triple-channel, quad-channel or six-channel digital isolator devices in five different packages - 8-pin narrow-body SOIC (D), 8-pin wide-body SOIC (DWV), 16-pin wide-body SOIC (DW), 16-pin ultra- (...)

User guide

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Evaluation board

ISO722XEVM — ISO722X EVM Bench

This evaluation module (EVM) is used for testing the parametrics of the factory installed ISO7421 dual channel isolator. The EVM may be reconfigured by the user for use with any of the ISO7220X, ISO7221X or ISO742X dual channel isolators.

User guide

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Limit: 5

Simulation model

ISO7421 IBIS Model (Rev. A)

SLOM200A.ZIP (28 KB) - IBIS Model

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