ISO7221BD Digital Isolator 2500Vrms 2-Channel Equivalent & Substitute Parts

Part Overview

The ISO7221BD is a general purpose digital isolator manufactured by Texas Instruments, featuring 2500Vrms isolation voltage and 2-channel unidirectional configuration in an 8-SOIC package. This device utilizes capacitive coupling technology for signal isolation with a 5Mbps data rate and 25kV/µs common mode transient immunity. The ISO7221BD is currently in Last Time Buy status, making equivalent and substitute parts essential for ongoing design support and procurement planning. Alternative models provide comparable isolation performance across different coupling technologies, data rates, and packaging options to ensure design continuity.

Substiute Parts

ISO7221BD

Texas InstrumentsIn Stock: 3728ISO7221BD Datasheet

Current PartRFQ

ISO7221BDR

Texas InstrumentsIn Stock: 655307ISO7221BDR Datasheet

MFR RecommendedRFQ

ADUM1201ARZ

Analog Devices Inc.In Stock: 16248ADUM1201ARZ Datasheet

MFR RecommendedRFQ

ADUM1201ARZ-RL7

Analog Devices Inc.In Stock: 52408ADUM1201ARZ-RL7 Datasheet

MFR RecommendedRFQ

ADUM1201BRZ

Analog Devices Inc.In Stock: 15440ADUM1201BRZ Datasheet

MFR RecommendedRFQ

ADUM1201BRZ-RL7

Analog Devices Inc.In Stock: 15112ADUM1201BRZ-RL7 Datasheet

MFR RecommendedRFQ

ADUM1201CRZ

Analog Devices Inc.In Stock: 5223ADUM1201CRZ Datasheet

MFR RecommendedRFQ

ADUM1201CRZ-RL7

Analog Devices Inc.In Stock: 4829ADUM1201CRZ-RL7 Datasheet

MFR RecommendedRFQ

IL 611-3E

NVE Corp/Isolation ProductsIn Stock: 6060IL 611-3E Datasheet

MFR RecommendedRFQ

IL 611-3ETR7

NVE Corp/Isolation ProductsIn Stock: 1067IL 611-3ETR7 Datasheet

MFR RecommendedRFQ

SI8622BC-B-ISR

Skyworks Solutions Inc.In Stock: 17535SI8622BC-B-ISR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ISO7221BD is determined by the following critical parameters: 2500Vrms isolation voltage, 2-channel unidirectional configuration, 8-SOIC package form factor, surface mount technology, and compliance certifications (ROHS3, REACH Unaffected). The substitute parts are grouped into three categories based on coupling technology and performance characteristics:

Category 1: Texas Instruments Capacitive Coupling (Same Technology) ISO7221BDR maintains identical electrical specifications with alternative packaging (Cut Tape & Digi-Reel). This represents a direct equivalent with active product status.

Category 2: Analog Devices Magnetic Coupling (iCoupler Series) ADUM1201 variants (ARZ, ARZ-RL7, BRZ, BRZ-RL7, CRZ, CRZ-RL7) provide 2500Vrms isolation with magnetic coupling technology. These parts maintain the same isolation voltage, channel configuration, and package but offer variable data rates (1Mbps to 25Mbps) and extended supply voltage range (2.7V ~ 5.5V). Operating temperature range is reduced to -40°C ~ 105°C.

Category 3: NVE Corp GMR Technology (IsoLoop Series) IL 611-3E and IL 611-3ETR7 employ Giant Magnetoresistive (GMR) technology with 100Mbps data rate and 15kV/µs CMTI. These maintain 2500Vrms isolation and 8-SOIC packaging but feature different channel input configuration (2/0) and reduced operating temperature range (-40°C ~ 85°C).

Category 4: Skyworks Capacitive Coupling (Enhanced Performance) SI8622BC-B-ISR provides higher isolation voltage (3750Vrms), increased data rate (150Mbps), and superior CMTI (35kV/µs) while maintaining capacitive coupling and 8-SOIC package. Supply voltage range extends to 2.5V minimum.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent (Recommended for Last Time Buy Replacement) ISO7221BDR is the primary substitute for ISO7221BD. Both devices are manufactured by Texas Instruments with identical electrical specifications, isolation voltage, data rate, and operating temperature range. The only difference is packaging format (Cut Tape & Digi-Reel versus Tube). This part maintains active product status and full compliance with ROHS3 and REACH requirements.

Analog Devices iCoupler Series (ADUM1201 Variants) The ADUM1201 family provides active alternatives with magnetic coupling technology. ADUM1201BRZ and ADUM1201BRZ-RL7 offer 10Mbps data rate, which exceeds the ISO7221BD specification while maintaining 2500Vrms isolation and 25kV/µs CMTI. ADUM1201CRZ and ADUM1201CRZ-RL7 provide 25Mbps capability for higher-speed applications. All variants maintain ROHS3 compliance and MSL 1 rating. Extended supply voltage range (2.7V minimum) provides additional design flexibility. Operating temperature maximum is reduced to 105°C.

NVE IsoLoop Series (IL 611-3E / IL 611-3ETR7) These GMR-based isolators deliver 100Mbps data rate with 2500Vrms isolation. The reduced CMTI specification (15kV/µs versus 25kV/µs) and narrower operating temperature range (-40°C ~ 85°C) require application-level evaluation. Both variants maintain ROHS3 compliance and are suitable for high-speed isolation applications where temperature constraints are acceptable.

Skyworks SI8622BC-B-ISR (Enhanced Performance Option) This capacitive coupling device provides superior specifications: 3750Vrms isolation voltage, 150Mbps data rate, and 35kV/µs CMTI. It maintains the same operating temperature range as ISO7221BD (-40°C ~ 125°C) and extends supply voltage compatibility to 2.5V minimum. MSL rating is 2A (4 Weeks), requiring controlled storage conditions. This part is suitable for applications requiring enhanced isolation margin and higher bandwidth.

Frequently Asked Questions (FAQ)

Q: Can ISO7221BDR directly replace ISO7221BD in existing designs? A: Yes. ISO7221BDR is electrically and functionally identical to ISO7221BD. The only difference is packaging format (Cut Tape & Digi-Reel versus Tube). Both maintain the same 2500Vrms isolation, 5Mbps data rate, 25kV/µs CMTI, and -40°C ~ 125°C operating range. No design changes are required.

Q: What are the key differences between Texas Instruments ISO7221 and Analog Devices ADUM1201 isolators? A: The primary differences are coupling technology (capacitive versus magnetic) and data rate options. ISO7221BD uses capacitive coupling at 5Mbps, while ADUM1201 variants use magnetic coupling with selectable data rates (1Mbps, 10Mbps, or 25Mbps). Both maintain 2500Vrms isolation and 25kV/µs CMTI. ADUM1201 extends minimum supply voltage to 2.7V but reduces maximum operating temperature to 105°C.

Q: Is the NVE IL 611-3E suitable as a direct replacement for ISO7221BD? A: IL 611-3E maintains 2500Vrms isolation and 8-SOIC packaging but differs in three critical areas: GMR technology instead of capacitive coupling, 100Mbps data rate (versus 5Mbps), and reduced CMTI (15kV/µs versus 25kV/µs). Additionally, operating temperature range is limited to -40°C ~ 85°C. This part is suitable only for applications where the reduced CMTI and temperature range are acceptable and higher bandwidth is beneficial.

Q: What is the advantage of SI8622BC-B-ISR over ISO7221BD? A: SI8622BC-B-ISR provides enhanced isolation performance with 3750Vrms (versus 2500Vrms), higher data rate (150Mbps versus 5Mbps), and superior CMTI (35kV/µs versus 25kV/µs). It maintains the same -40°C ~ 125°C operating range and capacitive coupling technology. The trade-off is MSL 2A moisture sensitivity requiring controlled storage. This part is recommended for applications requiring higher isolation margin or bandwidth.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH Unaffected status, matching the environmental compliance of ISO7221BD.

Q: What packaging options are available for these digital isolators? A: Substitute parts are available in Tube, Cut Tape & Digi-Reel (CT & Digi-Reel), and Tape & Reel (TR) formats. All maintain the same 8-SOIC (0.154", 3.90mm Width) physical package. Packaging selection depends on procurement volume and assembly process requirements.

Q: Can ADUM1201ARZ (1Mbps) be used in place of ISO7221BD (5Mbps)? A: ADUM1201ARZ is not suitable as a direct replacement due to insufficient data rate (1Mbps versus 5Mbps). However, ADUM1201BRZ (10Mbps) or ADUM1201CRZ (25Mbps) provide data rates exceeding ISO7221BD specifications and are functionally compatible with identical isolation voltage and CMTI.