ISO7240CFDW Equivalent & Substitute Parts

Part Overview

The ISO7240CFDW is a general purpose digital isolator manufactured by Texas Instruments, featuring 2500Vrms isolation voltage, 4 channels, and 25Mbps data rate in a 16-SOIC package. This device is currently in Last Time Buy status, indicating end-of-life production. Identifying equivalent and substitute parts is necessary to ensure design continuity and long-term component availability for new production runs and system updates.

Key Parameters

Parameter	ISO7240CFDW
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)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the ISO7240CFDW are grouped based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Isolation voltage: 2500Vrms (mandatory match)
Number of channels: 4 (mandatory match)
Channel type: Unidirectional (mandatory match)
Package type: 16-SOIC (mandatory match)
Mounting type: Surface Mount (mandatory match)

Secondary Compatibility Parameters:

Data rate: 25Mbps or higher
Common Mode Transient Immunity: 25kV/µs or higher
Supply voltage range: Must encompass 3.15V ~ 5.5V
Operating temperature: Must support -40°C ~ 125°C or equivalent range

Substitutes are classified into two categories:

Category 1: Direct Packaging Equivalent (Same Manufacturer) ISO7240CFDWR meets all primary criteria with identical electrical specifications but differs in packaging format (Cut Tape & Digi-Reel vs. Tube). This part maintains Active product status.

Category 2: Parametric Equivalents (Same Manufacturer, Identical Electrical Performance) ISO7240CDW provides identical electrical specifications and 4-channel configuration in 16-SOIC package but carries Last Time Buy status. ISO7230CDW is a 3-channel variant that does not meet the 4-channel requirement and is listed for reference only.

Category 3: Alternative Technology Substitutes (Different Manufacturer, Enhanced Performance) IL 715 series parts (NVE Corp) utilize GMR (Giant Magnetoresistive) technology instead of capacitive coupling. These parts exceed the primary electrical requirements with 110Mbps data rate and 100kV/µs CMTI, maintaining 2500Vrms isolation and 4-channel configuration. Package variants include different SOIC widths (0.154" vs. 0.295").

Parameter Comparison

Parameter	ISO7240CFDW	ISO7240CFDWR	ISO7240CDW	IL 715-3	IL 715-3E	IL 715E
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	NVE Corp	NVE Corp	NVE Corp
Technology	Capacitive Coupling	Capacitive Coupling	Capacitive Coupling	GMR	GMR	GMR
Number of Channels	4	4	4	4	4	4
Voltage - Isolation	2500Vrms	2500Vrms	2500Vrms	2500Vrms	2500Vrms	2500Vrms
Data Rate	25Mbps	25Mbps	25Mbps	110Mbps	110Mbps	110Mbps
Common Mode Transient Immunity (Min)	25kV/µs	25kV/µs	25kV/µs	100kV/µs	100kV/µs	100kV/µs
Propagation Delay tpLH / tpHL (Max)	42ns / 42ns	42ns / 42ns	42ns / 42ns	15ns / 15ns	15ns / 15ns	15ns / 15ns
Voltage - Supply	3.15V ~ 5.5V	3.15V ~ 5.5V	3.15V ~ 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 ~ 100°C	-40°C ~ 100°C	-40°C ~ 100°C
Package / Case	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 (0.295", 7.50mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Last Time Buy	Active	Last Time Buy	Active	Active	Active

Engineering Selection Recommendations

For Direct Replacement (Same Electrical Performance, Active Status): ISO7240CFDWR is the recommended substitute. It maintains identical electrical specifications and 16-SOIC (0.295", 7.50mm) package footprint as the ISO7240CFDW while offering Active product status and extended availability. The only difference is packaging format (Cut Tape & Digi-Reel vs. Tube), which does not affect circuit functionality.

For Enhanced Performance Applications: IL 715-3E and IL 715E are suitable substitutes when higher performance margins are acceptable. Both parts provide superior data rate (110Mbps vs. 25Mbps), lower propagation delay (15ns vs. 42ns), and higher CMTI (100kV/µs vs. 25kV/µs). IL 715-3E offers ROHS3 compliance and Active status. IL 715E maintains the 0.295" SOIC width matching the original package footprint. Both operate at -40°C to 100°C, which is narrower than the original -40°C to 125°C range.

For RoHS3 Compliance Requirement: If RoHS3 compliance is mandatory, IL 715-3E or IL 715E are preferred over IL 715-3 or IL 715T, which carry RoHS non-compliant status.

For Package Footprint Compatibility: IL 715E and IL 715ETR13 maintain the 0.295" (7.50mm) SOIC width, ensuring direct PCB layout compatibility. IL 715-3, IL 715-3E, and IL 715-3ETR7 use the narrower 0.154" (3.90mm) SOIC width and require PCB layout verification before substitution.

Frequently Asked Questions (FAQ)

Q: Can ISO7240CFDWR be used as a direct replacement for ISO7240CFDW? A: Yes. ISO7240CFDWR is electrically and functionally identical to ISO7240CFDW. The only difference is packaging format (Cut Tape & Digi-Reel vs. Tube). Both use the same 16-SOIC (0.295", 7.50mm) package and have identical electrical specifications. ISO7240CFDWR carries Active product status, providing better long-term availability.

Q: What is the key difference between Texas Instruments ISO7240 series and NVE IL 715 series? A: The primary difference is isolation technology. ISO7240 uses capacitive coupling, while IL 715 uses GMR (Giant Magnetoresistive) technology. IL 715 parts offer superior performance with 110Mbps data rate versus 25Mbps, 15ns propagation delay versus 42ns, and 100kV/µs CMTI versus 25kV/µs. Both maintain 2500Vrms isolation and 4-channel configuration.

Q: Can IL 715-3 be used in place of ISO7240CFDW without PCB modifications? A: IL 715-3 uses a narrower 16-SOIC package (0.154" width vs. 0.295" width). While the pin count and spacing are identical, the package body width differs. PCB layout verification is required to confirm pad and trace compatibility. IL 715E uses the same 0.295" width as ISO7240CFDW and requires no PCB modifications.

Q: Are there temperature range limitations when substituting with IL 715 series? A: Yes. IL 715 series parts operate from -40°C to 100°C, while ISO7240CFDW operates from -40°C to 125°C. If the application requires operation above 100°C, IL 715 series substitutes are not suitable. IL 715T extends the upper temperature limit to 125°C but carries RoHS non-compliant status.

Q: What is the inventory status of recommended substitutes? A: ISO7240CFDWR (Active status) has 2109 pcs in stock. IL 715-3E (Active status) has 8807 pcs in stock. IL 715E (Active status) has 4460 pcs in stock. All recommended substitutes maintain adequate inventory levels for production requirements.

Q: Does substituting with IL 715 series require circuit design changes? A: No circuit design changes are required. IL 715 series parts are pin-compatible and functionally equivalent. The superior performance characteristics (higher data rate, lower propagation delay, higher CMTI) are backward compatible with designs specified for ISO7240CFDW. Existing firmware and software require no modification.

Q: Which substitute offers the best compliance profile? A: IL 715-3E and IL 715E both carry ROHS3 compliance and Active product status. IL 715-3E provides the highest inventory availability (8807 pcs) among compliant alternatives. Both parts meet REACH Unaffected and EAR99 ECCN classifications matching the original part.

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