IL 721T-3E Digital Isolator Equivalent & Substitute Parts

Part Overview

The IL 721T-3E is a General Purpose Digital Isolator manufactured by NVE Corp/Isolation Products, part of the IsoLoop® series. This 2500Vrms rated isolator provides 2-channel unidirectional isolation with 110Mbps data rate capability and 100kV/µs common mode transient immunity in an 8-SOIC surface mount package. The part is Active status and ROHS3 compliant. Substitute parts are identified when design requirements allow for reduced channel count, different compliance certifications, or alternative packaging configurations while maintaining core electrical isolation specifications.

Key Parameters

Parameter	Value
Manufacturer	NVE Corp/Isolation Products
Series	IsoLoop®
Technology	GMR (Giant Magnetoresistive)
Voltage - Isolation	2500Vrms
Number of Channels	2
Data Rate	110Mbps
Common Mode Transient Immunity (Min)	100kV/µs
Voltage - Supply	3V ~ 5.5V
Operating Temperature	-40°C ~ 125°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution logic for the IL 721T-3E is based on the following allowed parameters:

Primary Substitution Criteria:

Voltage - Isolation: 2500Vrms (fixed requirement)
Common Mode Transient Immunity: 100kV/µs (fixed requirement)
Data Rate: 110Mbps (fixed requirement)
Package / Case: 8-SOIC (0.154", 3.90mm Width) (fixed requirement)
Voltage - Supply: 3V ~ 5.5V (fixed requirement)
Operating Temperature: -40°C ~ 125°C (fixed requirement)
Technology: GMR (Giant Magnetoresistive) (fixed requirement)
Series: IsoLoop® (fixed requirement)

Variable Parameters Allowing Substitution:

Number of Channels: 2 (main part) vs. 1 (substitute IL 710T-3, IL 710T-3E)
RoHS Status: ROHS3 Compliant (main part) vs. RoHS non-compliant (IL 712T-3, IL 710T-3)
Packaging Configuration: Tube (standard)

Substitutes are grouped into two categories:

Category A - Same Channel Count (2-Channel): IL 712T-3 and IL 712T-3E maintain identical 2-channel configuration. Differentiation is based on RoHS compliance status and inventory availability.

Category B - Reduced Channel Count (1-Channel): IL 710T-3 and IL 710T-3E provide single-channel isolation. These are applicable only when circuit design requires single isolated signal path rather than dual channels.

Parameter Comparison

Parameter	IL 721T-3E (Main)	IL 712T-3	IL 712T-3E	IL 710T-3	IL 710T-3E
Manufacturer	NVE Corp	NVE Corp	NVE Corp	NVE Corp	NVE Corp
Series	IsoLoop®	IsoLoop®	IsoLoop®	IsoLoop®	IsoLoop®
Technology	GMR	GMR	GMR	GMR	GMR
Number of Channels	2	2	2	1	1
Voltage - Isolation	2500Vrms	2500Vrms	2500Vrms	2500Vrms	2500Vrms
Data Rate	110Mbps	110Mbps	110Mbps	110Mbps	110Mbps
Common Mode Transient Immunity	100kV/µs	100kV/µs	100kV/µs	100kV/µs	100kV/µs
Propagation Delay tpLH / tpHL (Max)	15ns / 15ns	15ns / 15ns	15ns / 15ns	15ns / 15ns	15ns / 15ns
Pulse Width Distortion (Max)	3ns	3ns	3ns	3ns	3ns
Rise / Fall Time (Typ)	1ns / 1ns	1ns / 1ns	1ns / 1ns	1ns / 1ns	1ns / 1ns
Voltage - Supply	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 ~ 125°C
Package / Case	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
Inventory (Pcs)	812	1464	5134	962	867

Engineering Selection Recommendations

For IL 721T-3E Direct Replacement (2-Channel, ROHS3 Compliant):

IL 712T-3E is the direct equivalent substitute. Both parts maintain identical electrical specifications, 2-channel configuration, ROHS3 compliance, and Active product status. IL 712T-3E offers higher inventory availability (5134 units vs. 812 units), making it suitable for high-volume production requirements.

For 2-Channel Applications with RoHS Non-Compliance Acceptable:

IL 712T-3 provides 2-channel isolation with identical electrical performance but carries RoHS non-compliant status and ECCN 5A991A classification. This part is applicable only when regulatory requirements do not mandate ROHS3 compliance.

For Single-Channel Isolation Applications:

IL 710T-3E is the ROHS3-compliant single-channel substitute when circuit design requires only one isolated signal path. Electrical specifications remain identical to the main part except for channel count reduction. IL 710T-3E maintains Active product status and EAR99 ECCN classification.

IL 710T-3 provides single-channel isolation with RoHS non-compliant status and ECCN 5A991A classification, applicable only when compliance requirements permit.

Compliance-Based Selection:

ROHS3 Compliant requirement: Select IL 721T-3E, IL 712T-3E, or IL 710T-3E
RoHS non-compliant acceptable: IL 712T-3 or IL 710T-3 are available
EAR99 ECCN requirement: IL 721T-3E, IL 712T-3E, or IL 710T-3E
ECCN 5A991A acceptable: IL 712T-3 or IL 710T-3

Frequently Asked Questions (FAQ)

Q: Can IL 712T-3E replace IL 721T-3E in all applications?

A: Yes. IL 712T-3E is a parametric equivalent with identical electrical specifications, channel count, isolation voltage, data rate, CMTI, supply voltage range, operating temperature range, and package configuration. Both are ROHS3 compliant and Active status.

Q: What is the primary difference between IL 721T-3E and IL 712T-3?

A: The primary difference is RoHS compliance status. IL 721T-3E is ROHS3 compliant with EAR99 ECCN classification. IL 712T-3 is RoHS non-compliant with ECCN 5A991A classification. All electrical parameters are identical.

Q: Can single-channel parts (IL 710T-3E or IL 710T-3) replace the 2-channel IL 721T-3E?

A: Single-channel parts can replace IL 721T-3E only if the circuit design requires isolation of a single signal path rather than two independent channels. The electrical specifications for isolation voltage, data rate, CMTI, and timing parameters are identical. PCB layout and signal routing must be redesigned to accommodate the reduced channel count.

Q: What is the difference between IL 710T-3 and IL 710T-3E?

A: IL 710T-3E is ROHS3 compliant with EAR99 ECCN classification and Active product status. IL 710T-3 is RoHS non-compliant with ECCN 5A991A classification. All electrical parameters and package specifications are identical.

Q: Are all substitute parts available in the same packaging?

A: All substitute parts use 8-SOIC (0.154", 3.90mm Width) surface mount package. Packaging configuration (Tube) is standard across all parts listed.

Q: What inventory considerations should guide part selection?

A: IL 712T-3E offers the highest inventory availability at 5134 units. IL 712T-3 provides 1464 units. IL 710T-3 and IL 710T-3E offer 962 and 867 units respectively. IL 721T-3E has 812 units in stock. Selection should account for production volume requirements and lead time constraints.

Q: Do all substitute parts maintain the same operating temperature range?

A: Yes. All substitute parts operate across -40°C to 125°C temperature range, identical to IL 721T-3E.

Q: Are there any differences in supply voltage requirements between the main part and substitutes?

A: No. All parts require 3V to 5.5V supply voltage range. No design modifications to power supply circuits are necessary when substituting between these parts.

Q: What is the significance of the ECCN classification difference?

A: EAR99 classification (IL 721T-3E, IL 712T-3E, IL 710T-3E) indicates different export control requirements compared to ECCN 5A991A (IL 712T-3, IL 710T-3). Selection must comply with applicable export regulations for the intended destination.

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