ISO150AUG4 Digital Isolator Equivalent & Substitute Parts

Part Overview

The ISO150AUG4 is a general purpose digital isolator manufactured by Texas Instruments, featuring 1500Vrms isolation voltage, 2 channels, and 80MBd data rate in a 28-SOIC package. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system design and procurement.

The obsolete status of the ISO150AUG4 necessitates evaluation of alternative components that maintain functional compatibility while meeting current design requirements and supply chain availability.

Substiute Parts

ISO150AUG4

Texas InstrumentsIn Stock: 904ISO150AUG4 Datasheet

Current PartRFQ

ISO7342CDW

Texas InstrumentsIn Stock: 58815ISO7342CDW Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ISO150AUG4 is evaluated based on the following critical parameters:

• Technology: Capacitive coupling isolator architecture
• Isolation Voltage: Minimum 1500Vrms required for equivalent isolation performance
• Channel Configuration: Functional channel count and input/output arrangement
• Data Rate: Minimum 80MBd to maintain signal integrity requirements
• Supply Voltage Compatibility: 3V to 5.5V operating range
• Package Type: Surface mount SOIC family
• Compliance: ROHS3 compliance and EAR99 classification

The ISO7342CDW qualifies as a substitute based on superior isolation voltage (3000Vrms), higher data rate capability (25Mbps), enhanced CMTI performance (25kV/µs), active product status, and identical supply voltage range. The package transition from 28-SOIC to 16-SOIC requires PCB layout modification.

Parameter Comparison

Engineering Selection Recommendations

The ISO7342CDW is the manufacturer-recommended substitute for the obsolete ISO150AUG4. Selection of this alternative is supported by:

• Active Product Status: ISO7342CDW maintains active production status, ensuring long-term supply chain availability and support
• Enhanced Isolation Performance: 3000Vrms isolation voltage exceeds the 1500Vrms requirement of the original part
• Compliance Alignment: Both components maintain ROHS3 compliance and EAR99 classification
• Extended Operating Range: ISO7342CDW supports -40°C to 125°C temperature range, providing broader operational envelope
• Improved Reliability: Lower MSL rating (2 vs. 3) indicates superior moisture resistance characteristics

Design implementation requires accommodation of package geometry change from 28-SOIC to 16-SOIC and functional adaptation to 4-channel architecture with unidirectional channel configuration.

Frequently Asked Questions (FAQ)

Q: Can ISO7342CDW directly replace ISO150AUG4 without PCB modification?

A: No. The ISO7342CDW uses a 16-SOIC package compared to the 28-SOIC package of the ISO150AUG4. PCB layout redesign is required to accommodate the different pin count and package footprint.

Q: What is the primary advantage of ISO7342CDW over ISO150AUG4?

A: The ISO7342CDW provides doubled isolation voltage (3000Vrms vs. 1500Vrms), significantly higher CMTI performance (25kV/µs vs. 1.6kV/µs), active product status, and extended operating temperature range (-40°C to 125°C vs. -40°C to 85°C).

Q: Are there functional differences in channel configuration?

A: Yes. The ISO150AUG4 features 2 bidirectional channels, while the ISO7342CDW provides 4 unidirectional channels. System design must accommodate this architectural difference in signal routing and control logic.

Q: Does the data rate difference affect system compatibility?

A: The ISO150AUG4 operates at 80MBd while the ISO7342CDW operates at 25Mbps. For applications requiring the full 80MBd bandwidth of the original part, the ISO7342CDW data rate may be limiting. System requirements must be evaluated against this specification.

Q: Are both components RoHS compliant?

A: Yes. Both ISO150AUG4 and ISO7342CDW are ROHS3 compliant and carry EAR99 classification.

Q: What is the significance of the MSL rating difference?

A: The ISO7342CDW has MSL 2 (1 Year) compared to ISO150AUG4 MSL 3 (168 Hours). Lower MSL ratings indicate better moisture resistance and longer shelf life before reflow soldering is required.