ISO7240CDWRG4 Digital Isolator Equivalent & Substitute Parts

Part Overview

The ISO7240CDWRG4 is a general purpose digital isolator manufactured by Texas Instruments, featuring 2500Vrms isolation, 4 channels, and 25Mbps data rate in a 16-SOIC package. This part is discontinued at DiGi Electronics, necessitating identification of active equivalent and substitute components that maintain functional compatibility for new designs and production continuity.

Key Parameters

Parameter	ISO7240CDWRG4
Manufacturer	Texas Instruments
Technology	Capacitive Coupling
Number of Channels	4
Voltage - Isolation	2500Vrms
Data Rate	25Mbps
Common Mode Transient Immunity (Min)	25kV/µs
Propagation Delay tpLH / tpHL (Max)	42ns / 42ns
Voltage - Supply	3.15V ~ 5.5V
Operating Temperature	-40°C ~ 125°C
Package / Case	16-SOIC (0.295", 7.50mm Width)
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitution is determined by the following critical parameters: isolation voltage (2500Vrms), number of channels (4), channel configuration (unidirectional, 4 inputs / 0 outputs), package type (16-SOIC), and operating temperature range (-40°C ~ 125°C). Parts are grouped into two categories:

Parametric Equivalents (Texas Instruments ISO7240 Series): Parts maintaining identical electrical specifications, technology (capacitive coupling), and package dimensions. These are direct functional replacements with active product status.

Manufacturer Recommended Alternatives (NVE IsoLoop® IL 715 Series): Parts meeting isolation voltage and channel requirements but utilizing different isolation technology (GMR), offering enhanced performance characteristics (higher data rate, faster propagation delay, superior CMTI) while maintaining package compatibility and operating temperature range.

Parameter Comparison

Parameter	ISO7240CDWRG4	ISO7230CDWR	ISO7240CDWR	ISO7240CFDWR	IL 715-3	IL 715-3E	IL 715-3ETR7	IL 715ETR13	IL 715T	IL 715T-3E
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	NVE Corp	NVE Corp	NVE Corp	NVE Corp	NVE Corp	NVE Corp
Number of Channels	4	3	4	4	4	4	4	4	4	4
Technology	Capacitive Coupling	Capacitive Coupling	Capacitive Coupling	Capacitive Coupling	GMR	GMR	GMR	GMR	GMR	GMR
Voltage - Isolation	2500Vrms	2500Vrms	2500Vrms	2500Vrms	2500Vrms	2500Vrms	2500Vrms	2500Vrms	2500Vrms	2500Vrms
Data Rate	25Mbps	25Mbps	25Mbps	25Mbps	110Mbps	110Mbps	110Mbps	110Mbps	110Mbps	110Mbps
Common Mode Transient Immunity (Min)	25kV/µs	25kV/µs	25kV/µs	25kV/µs	100kV/µs	100kV/µs	100kV/µs	100kV/µs	100kV/µs	100kV/µs
Propagation Delay tpLH / tpHL (Max)	42ns / 42ns	42ns / 42ns	42ns / 42ns	42ns / 42ns	15ns / 15ns	15ns / 15ns	15ns / 15ns	15ns / 15ns	15ns / 15ns	15ns / 15ns
Voltage - Supply	3.15V ~ 5.5V	3.15V ~ 5.5V	3.15V ~ 5.5V	3.15V ~ 5.5V	3V ~ 5.5V	3V ~ 5.5V	3V ~ 5.5V	3V ~ 5.5V	3V ~ 5.5V	3V ~ 5.5V
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 100°C	-40°C ~ 100°C	-40°C ~ 100°C	-40°C ~ 100°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	16-SOIC (0.295", 7.50mm)	16-SOIC (0.295", 7.50mm)	16-SOIC (0.295", 7.50mm)	16-SOIC (0.295", 7.50mm)	16-SOIC (0.154", 3.90mm)	16-SOIC (0.154", 3.90mm)	16-SOIC (0.154", 3.90mm)	16-SOIC (0.295", 7.50mm)	16-SOIC (0.295", 7.50mm)	16-SOIC (0.154", 3.90mm)
Product Status	Discontinued	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	2 (1 Year)	2 (1 Year)	2 (1 Year)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Direct Replacement (Same Technology, Active Status): ISO7240CDWR is the primary substitute, offering identical electrical specifications and capacitive coupling technology with active product status and improved MSL rating (2 vs. 3). ISO7240CFDWR provides equivalent performance with lower inventory availability. ISO7230CDWR is suitable only for applications requiring 3-channel isolation, as it reduces channel count from 4 to 3.

Enhanced Performance Alternative (Different Technology, Active Status): IL 715-3ETR7 and IL 715T-3E are recommended for designs tolerating package width reduction (3.90mm vs. 7.50mm) and requiring superior performance metrics: 110Mbps data rate (4.4× improvement), 15ns propagation delay (2.8× faster), and 100kV/µs CMTI (4× improvement). Both maintain 2500Vrms isolation, 4-channel configuration, and -40°C to 100°C operating range. IL 715T-3E adds ROHS3 compliance and extended temperature operation to 125°C.

Full Package Compatibility Alternative: IL 715ETR13 and IL 715T maintain the original 0.295" (7.50mm) package width while delivering GMR technology benefits. IL 715T extends operating temperature to 125°C, matching the original specification.

Compliance Considerations: For RoHS3-compliant designs, avoid IL 715 and IL 715T (non-compliant). Select IL 715-3E, IL 715-3ETR7, IL 715ETR13, or IL 715T-3E. For MSL-sensitive applications, NVE IsoLoop® parts offer superior moisture resistance (MSL 1 vs. MSL 2-3).

Frequently Asked Questions (FAQ)

Q: Can ISO7230CDWR replace ISO7240CDWRG4 directly? A: No. ISO7230CDWR provides only 3 channels versus the required 4 channels. Use only if application requirements permit channel reduction.

Q: What is the primary difference between Texas Instruments ISO7240 and NVE IL 715 series? A: Isolation technology differs: ISO7240 uses capacitive coupling; IL 715 uses GMR (Giant Magnetoresistive). IL 715 delivers superior performance (4.4× higher data rate, 2.8× faster propagation delay, 4× higher CMTI) but requires package width consideration for PCB layout.

Q: Are package dimensions interchangeable between 0.295" and 0.154" width variants? A: No. Package width affects PCB footprint and component spacing. IL 715-3 series (0.154" width) requires PCB redesign. IL 715ETR13 and IL 715T (0.295" width) maintain original footprint compatibility.

Q: Which substitute is recommended for new designs? A: ISO7240CDWR for direct replacement with identical specifications. IL 715T-3E for enhanced performance with ROHS3 compliance and extended temperature range (-40°C to 125°C), accepting package width reduction.

Q: Do all substitutes maintain 2500Vrms isolation? A: Yes. All listed substitutes maintain 2500Vrms isolation voltage, meeting the primary isolation requirement.

Q: What is the impact of operating temperature range differences? A: IL 715-3, IL 715-3E, IL 715-3ETR7, and IL 715ETR13 operate to 100°C maximum, versus 125°C for ISO7240CDWRG4, IL 715T, and IL 715T-3E. Verify application thermal requirements before selection.

Q: Are there supply voltage compatibility concerns? A: ISO7240 series operates 3.15V–5.5V; IL 715 series operates 3V–5.5V. IL 715 accepts lower minimum voltage (3V vs. 3.15V), providing broader supply range compatibility.

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