ISO7421MDREP Equivalent & Substitute Parts

Part Overview

The ISO7421MDREP is a general purpose digital isolator manufactured by Texas Instruments, featuring 2500Vrms isolation voltage and 2-channel unidirectional architecture in an 8-SOIC surface mount package. This device is currently active in production status and complies with ROHS3 and REACH requirements. Substitute parts are identified when equivalent electrical performance, package compatibility, and isolation ratings are maintained across alternative manufacturers, enabling design flexibility and supply chain optimization.

Substiute Parts

ISO7421MDREP

Texas InstrumentsIn Stock: 1896ISO7421MDREP Datasheet

Current PartRFQ

SI8621AB-B-ISR

Skyworks Solutions Inc.In Stock: 19426SI8621AB-B-ISR Datasheet

MFR RecommendedRFQ

SI8621BC-B-ISR

Skyworks Solutions Inc.In Stock: 9671SI8621BC-B-ISR Datasheet

MFR RecommendedRFQ

SI8621EC-B-ISR

Skyworks Solutions Inc.In Stock: 25135SI8621EC-B-ISR Datasheet

MFR RecommendedRFQ

SI8622EC-B-ISR

Skyworks Solutions Inc.In Stock: 35133SI8622EC-B-ISR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts are classified into two groups based on electrical performance characteristics:

Group 1 - Direct Functional Equivalents (1Mbps Data Rate): SI8621AB-B-ISR maintains the same 2500Vrms isolation voltage, 2-channel unidirectional configuration, and 1Mbps data rate as the ISO7421MDREP. This part is suitable for direct replacement in applications where the original performance envelope is required.

Group 2 - Enhanced Performance Alternatives (150Mbps Data Rate): SI8621BC-B-ISR, SI8621EC-B-ISR, and SI8622EC-B-ISR provide higher isolation voltage (3750Vrms) and significantly increased data rate (150Mbps) compared to the ISO7421MDREP. These parts are compatible when the application can tolerate enhanced electrical specifications and the 8-SOIC package footprint remains unchanged.

Substitution Criteria:

• Package compatibility: All substitutes use 8-SOIC (0.154", 3.90mm Width)
• Channel configuration: All maintain 2-channel unidirectional architecture
• Technology: All use capacitive coupling isolation
• Compliance: All are ROHS3 compliant and REACH unaffected
• Mounting type: All are surface mount

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (ISO7421MDREP ↔ SI8621AB-B-ISR): SI8621AB-B-ISR is the functional equivalent when 1Mbps data rate and 2500Vrms isolation are required. Both parts maintain active production status and full regulatory compliance. The supply voltage range expands to 2.5V ~ 5.5V on the substitute, providing broader operational flexibility. Operating temperature minimum shifts from -55°C to -40°C; applications requiring sub-40°C operation must retain the ISO7421MDREP.

For Enhanced Performance (ISO7421MDREP → SI8621BC-B-ISR, SI8621EC-B-ISR, or SI8622EC-B-ISR): These substitutes provide 3750Vrms isolation voltage and 150Mbps data rate, representing enhanced electrical specifications. All three maintain active production status and ROHS3 compliance. Selection between SI8621BC-B-ISR, SI8621EC-B-ISR, and SI8622EC-B-ISR depends on packaging requirements: SI8621BC-B-ISR and SI8621EC-B-ISR are supplied in Cut Tape (CT) & Digi-Reel format, while SI8622EC-B-ISR is supplied in Tape & Reel (TR) format. Inventory availability varies across these options.

Temperature Consideration: Applications operating below -40°C must use ISO7421MDREP, as all Skyworks substitutes specify -40°C minimum operating temperature.

Frequently Asked Questions (FAQ)

Q: Can SI8621AB-B-ISR replace ISO7421MDREP in all applications? A: SI8621AB-B-ISR is functionally equivalent for applications operating at -40°C or above. Applications requiring operation below -40°C must use ISO7421MDREP, which specifies -55°C minimum operating temperature.

Q: What is the primary difference between SI8621AB-B-ISR and the higher-speed alternatives? A: SI8621AB-B-ISR maintains 1Mbps data rate matching ISO7421MDREP, while SI8621BC-B-ISR, SI8621EC-B-ISR, and SI8622EC-B-ISR support 150Mbps data rate with enhanced 3750Vrms isolation voltage.

Q: Are all substitute parts pin-compatible with ISO7421MDREP? A: All substitute parts use the same 8-SOIC (0.154", 3.90mm Width) package. Pin compatibility is confirmed by identical package specifications and 2-channel unidirectional channel configuration.

Q: What is the difference between SI8621EC-B-ISR and SI8622EC-B-ISR? A: Both parts are electrically identical with 3750Vrms isolation and 150Mbps data rate. The primary difference is packaging format: SI8621EC-B-ISR is supplied in Cut Tape (CT) & Digi-Reel format, while SI8622EC-B-ISR is supplied in Tape & Reel (TR) format.

Q: Do substitute parts maintain ROHS3 compliance? A: All substitute parts are ROHS3 compliant and REACH unaffected, matching the compliance status of ISO7421MDREP.

Q: What is the moisture sensitivity difference between ISO7421MDREP and substitutes? A: ISO7421MDREP has MSL 1 (Unlimited), while all Skyworks substitutes have MSL 2A (4 Weeks). This affects storage and handling requirements; MSL 2A parts require controlled humidity storage and have a 4-week floor life after bag opening.