ISO7240CFDWG4 Equivalent & Substitute Parts

Part Overview

The ISO7240CFDWG4 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 component is classified as Obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The device uses capacitive coupling technology and operates across -40°C to 125°C with supply voltage range of 3.15V to 5.5V.

Key Parameters

Parameter	ISO7240CFDWG4 Value
Manufacturer	Texas Instruments
Number of Channels	4
Voltage - Isolation	2500Vrms
Common Mode Transient Immunity (Min)	25kV/µs
Data Rate	25Mbps
Propagation Delay tpLH / tpHL (Max)	42ns / 42ns
Pulse Width Distortion (Max)	2.5ns
Voltage - Supply	3.15V ~ 5.5V
Operating Temperature	-40°C ~ 125°C
Package / Case	16-SOIC (0.295", 7.50mm Width)
Technology	Capacitive Coupling
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the ISO7240CFDWG4 is determined by the following critical parameters:

Primary Substitution Criteria:

Number of Channels: 4 (unidirectional, 4 inputs / 0 outputs)
Voltage - Isolation: 2500Vrms
Package / Case: 16-SOIC (0.295", 7.50mm Width)
Technology: Capacitive Coupling
Operating Temperature Range: -40°C ~ 125°C
Voltage - Supply: 3.15V ~ 5.5V minimum compatibility

Secondary Compatibility Parameters:

Common Mode Transient Immunity (Min): 25kV/µs or higher
Data Rate: 25Mbps or higher
Propagation Delay: 42ns or lower
Pulse Width Distortion: 2.5ns or lower

Parts are grouped into two categories:

MFR Recommended Substitutes: Direct replacements with identical or superior electrical performance and active or last-time-buy product status.

Parametric Equivalents: Parts meeting primary substitution criteria with variations in secondary parameters, suitable for applications where performance headroom exists.

Parameter Comparison

Part Number	Manufacturer	Channels	Isolation (Vrms)	CMTI (kV/µs)	Data Rate (Mbps)	tpLH/tpHL (ns)	PWD (ns)	Supply (V)	Package	Status
ISO7240CFDWG4	Texas Instruments	4	2500	25	25	42 / 42	2.5	3.15–5.5	16-SOIC	Obsolete
ISO7240CFDW	Texas Instruments	4	2500	25	25	42 / 42	2.5	3.15–5.5	16-SOIC	Last Time Buy
ISO7240CFDWR	Texas Instruments	4	2500	25	25	42 / 42	2.5	3.15–5.5	16-SOIC	Active
ISO7240CDW	Texas Instruments	4	2500	25	25	42 / 42	2.5	3.15–5.5	16-SOIC	Last Time Buy
ISO7230CDW	Texas Instruments	3	2500	25	25	42 / 42	2.5	3.15–5.5	16-SOIC	Last Time Buy
SI8640AB-B-ISR	Skyworks Solutions Inc.	4	2500	35	1	35 / 35	25	2.5–5.5	16-SOIC	Active
SI8645BB-B-ISR	Skyworks Solutions Inc.	4	2500	35	150	13 / 13	4.5	2.5–5.5	16-SOIC	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

ISO7240CFDWR is the primary recommendation. This part maintains all electrical specifications of the ISO7240CFDWG4 while offering Active product status, ensuring long-term availability and manufacturing support. The device is supplied in Cut Tape and Digi-Reel packaging with MSL 2 (1 Year) rating.

ISO7240CFDW provides an alternative with Last Time Buy status and Tube packaging. This option is suitable for applications where procurement volume justifies last-time-buy inventory strategies.

ISO7240CDW offers identical electrical performance with Last Time Buy status and Tube packaging, providing additional procurement flexibility.

For Parametric Equivalence (4-Channel, 2500Vrms, 16-SOIC):

ISO7230CDW is a 3-channel variant maintaining all other electrical specifications. This part is suitable only for applications requiring 3 isolated channels instead of 4.

For Enhanced Performance (Higher CMTI, Active Status):

SI8645BB-B-ISR from Skyworks Solutions provides superior data rate (150Mbps vs. 25Mbps), faster propagation delay (13ns vs. 42ns), and higher CMTI (35kV/µs vs. 25kV/µs). This part is recommended for high-speed applications where performance headroom is required. Supply voltage range extends to 2.5V minimum.

SI8640AB-B-ISR from Skyworks Solutions offers higher CMTI (35kV/µs) and lower supply voltage floor (2.5V), though with reduced data rate (1Mbps). This part is suitable for low-speed, high-noise-immunity applications.

Compliance Considerations:

All recommended substitutes maintain ROHS3 compliance and EAR99 export classification. MSL ratings vary; verify moisture sensitivity requirements for your manufacturing process.

Frequently Asked Questions (FAQ)

Q: Can ISO7240CFDWR directly replace ISO7240CFDWG4?

A: Yes. ISO7240CFDWR is electrically identical to ISO7240CFDWG4 across all specified parameters and maintains the same 16-SOIC package. The primary difference is product status (Active vs. Obsolete) and packaging format (Cut Tape & Digi-Reel vs. standard). No design changes are required.

Q: What is the difference between ISO7240CFDW and ISO7240CFDWR?

A: Both parts are electrically identical. The difference is packaging: ISO7240CFDW is supplied in Tube format, while ISO7240CFDWR is supplied in Cut Tape and Digi-Reel format. ISO7240CFDWR has Active status; ISO7240CFDW has Last Time Buy status. Select based on procurement volume and packaging requirements.

Q: Can I use SI8645BB-B-ISR as a substitute?

A: SI8645BB-B-ISR is compatible from an isolation and package perspective but offers significantly different electrical performance. It provides 150Mbps data rate (vs. 25Mbps), 13ns propagation delay (vs. 42ns), and 35kV/µs CMTI (vs. 25kV/µs). Use this part only if your application requires higher performance. Verify timing-critical signal paths do not depend on the original 42ns propagation delay specification.

Q: Why is ISO7230CDW listed as a substitute if it has only 3 channels?

A: ISO7230CDW is a parametric equivalent meeting all electrical specifications except channel count. It is listed for applications where only 3 isolated channels are required, allowing use of existing design infrastructure and supply chain relationships. It is not suitable for designs requiring 4 channels.

Q: What does "Last Time Buy" status mean?

A: Last Time Buy indicates the manufacturer will no longer produce the part after current inventory is exhausted. Parts with this status (ISO7240CFDW, ISO7240CDW, ISO7230CDW) are available in limited quantities. For new designs or long-term production, select parts with Active status (ISO7240CFDWR, SI8645BB-B-ISR, SI8640AB-B-ISR).

Q: Are there supply voltage compatibility issues between substitutes?

A: ISO7240CFDWG4, ISO7240CFDW, ISO7240CFDWR, ISO7240CDW, and ISO7230CDW all require 3.15V to 5.5V supply. SI8640AB-B-ISR and SI8645BB-B-ISR operate at 2.5V to 5.5V, offering lower voltage floor compatibility. Verify your supply voltage range matches the selected substitute.

Q: What is the MSL (Moisture Sensitivity Level) difference, and does it matter?

A: ISO7240CFDWG4 has MSL 3 (168 Hours); all recommended substitutes have MSL 2 (1 Year) or MSL 2A (4 Weeks). Lower MSL values indicate better moisture tolerance and longer shelf life. This is advantageous for inventory management and reduces baking requirements before assembly.

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