ISO7721FDR Digital Isolator Equivalent & Substitute Parts

Part Overview

The ISO7721FDR is a general purpose digital isolator manufactured by Texas Instruments, featuring 3000Vrms isolation voltage, 2 channels, and 100Mbps data rate in an 8-SOIC surface mount package. The device is Active in product status and ROHS3 compliant. Equivalent and substitute parts are identified based on matching isolation voltage, data rate, package type, and channel configuration to support design flexibility and supply chain continuity.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Isolation Voltage	3000Vrms
Number of Channels	2
Data Rate	100Mbps
Common Mode Transient Immunity (Min)	85kV/µs
Package / Case	8-SOIC (0.154", 3.90mm Width)
Voltage - Supply	2.25V ~ 5.5V
Operating Temperature	-55°C ~ 125°C
Technology	Capacitive Coupling
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the ISO7721FDR are identified based on the following critical parameters:

Primary Matching Criteria:

Isolation voltage: 3000Vrms
Package type: 8-SOIC (0.154", 3.90mm Width)
Data rate: 100Mbps
Common mode transient immunity: 85kV/µs minimum
Supply voltage range: 2.25V ~ 5.5V
Operating temperature range: -55°C ~ 125°C
Technology: Capacitive coupling
Product status: Active

Channel Configuration Consideration: The ISO7721FDR features 2 channels (1 input/1 output per side). The ISO7710DR and ISO7710FDR are single-channel variants (1 input/0 output configuration) that meet all electrical and thermal specifications but differ in channel count. The ISO7721DR is an identical 2-channel configuration with different packaging designation (Digi-Reel vs. Cut Tape).

Parameter Comparison

Parameter	ISO7721FDR	ISO7710DR	ISO7710FDR	ISO7721DR
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Number of Channels	2	1	1	2
Isolation Voltage	3000Vrms	3000Vrms	3000Vrms	3000Vrms
Data Rate	100Mbps	100Mbps	100Mbps	100Mbps
CMTI (Min)	85kV/µs	85kV/µs	85kV/µs	85kV/µs
Propagation Delay tpLH / tpHL (Max)	16ns, 16ns	16ns, 16ns	16ns, 16ns	16ns, 16ns
Pulse Width Distortion (Max)	4.9ns	4.9ns	4.9ns	4.9ns
Rise / Fall Time (Typ)	1.8ns, 1.9ns	1.8ns, 1.9ns	1.8ns, 1.9ns	1.8ns, 1.9ns
Voltage - Supply	2.25V ~ 5.5V	2.25V ~ 5.5V	2.25V ~ 5.5V	2.25V ~ 5.5V
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Technology	Capacitive Coupling	Capacitive Coupling	Capacitive Coupling	Capacitive Coupling
Product Status	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	2 (1 Year)	2 (1 Year)	2 (1 Year)	2 (1 Year)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

ISO7721DR: Direct equivalent to ISO7721FDR with identical electrical specifications and 2-channel configuration. Differs only in packaging designation (Digi-Reel vs. Cut Tape). Selection between ISO7721FDR and ISO7721DR depends on supply chain requirements and packaging format preference. Both are Active status and ROHS3 compliant.

ISO7710DR and ISO7710FDR: Single-channel alternatives meeting all electrical and thermal parameters of the ISO7721FDR. These parts are suitable for applications requiring only one isolation channel. ISO7710FDR offers higher inventory availability (17,700 pcs) compared to ISO7710DR (2,800 pcs). Both are Active status and ROHS3 compliant.

Selection of single-channel variants requires circuit redesign to accommodate reduced channel count. All substitute parts maintain identical isolation voltage, data rate, CMTI, propagation delay, and operating temperature specifications.

Frequently Asked Questions (FAQ)

Q: Can ISO7710DR or ISO7710FDR replace ISO7721FDR in existing designs?

A: ISO7710DR and ISO7710FDR are single-channel devices, while ISO7721FDR provides 2 channels. Direct PCB replacement is not possible without circuit modification. These parts are electrical equivalents only for applications requiring single-channel isolation.

Q: What is the difference between ISO7721FDR and ISO7721DR?

A: Both parts are identical in electrical specifications and channel configuration (2 channels). The difference is packaging format: ISO7721FDR is supplied in Cut Tape (CT) format, while ISO7721DR is supplied in Digi-Reel format. Selection depends on assembly line requirements and tape reel compatibility.

Q: Are all substitute parts pin-compatible?

A: ISO7721FDR and ISO7721DR share identical pinouts (8-SOIC package). ISO7710DR and ISO7710FDR also use 8-SOIC packaging but have different pin assignments due to single-channel configuration. PCB layout modification is required when substituting 2-channel parts with 1-channel variants.

Q: Do all substitute parts meet the same compliance standards?

A: All listed parts are ROHS3 compliant, REACH unaffected, and carry identical moisture sensitivity levels (MSL 2, 1 Year). All are Active status products from Texas Instruments.

Q: What is the inventory status of substitute parts?

A: ISO7721DR: 45,400 pcs; ISO7710FDR: 17,700 pcs; ISO7710DR: 2,800 pcs; ISO7721FDR: 5,401 pcs. Inventory levels support supply chain planning and alternative sourcing decisions.

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