PM4351-RI Equivalent & Substitute Parts

Part Overview

The PM4351-RI is a telecom interface IC transceiver manufactured by Microchip Technology, designed for E1, J1, and T1 telecommunications applications. This component operates at 3.3V supply voltage and is housed in an 80-MQFP (14x14) surface mount package. The PM4351-RI is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and component procurement.

Substiute Parts

PM4351-RI

Microchip TechnologyIn Stock: 16042PM4351-RI Datasheet

Current PartRFQ

PM4351-RGI

Microchip TechnologyIn Stock: 2540PM4351-RGI Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PM4351-RI is determined by strict equivalence across the following parameters:

• Base Product Number: Both parts share PM4351, indicating identical core functionality
• Interface Standards: Both support E1, J1, and T1 telecommunications protocols
• Supply Voltage: Both operate at 3.3V
• Operating Temperature Range: Both rated -40°C ~ 85°C
• Package Configuration: Both use 80-QFP / 80-MQFP (14x14) surface mount packaging
• Moisture Sensitivity Level: Both classified as MSL 3 (168 Hours)

The PM4351-RGI is a direct functional equivalent with identical electrical and mechanical specifications. The primary distinction is product status and compliance certification.

Parameter Comparison

Engineering Selection Recommendations

The PM4351-RGI is the direct substitute for the PM4351-RI. Both components are electrically and mechanically identical across all specified parameters. Selection between these parts is determined by regulatory and procurement requirements:

PM4351-RGI is the preferred selection when:

• Active product status is required for ongoing supply chain support
• RoHS3 compliance is mandated by design or regulatory standards
• REACH compliance documentation is required for international distribution

PM4351-RI remains applicable when:

• Legacy system maintenance requires exact original part matching
• RoHS non-compliance is acceptable within the application context
• Existing inventory stock is available and cost-effective

Both parts are functionally interchangeable in E1, J1, and T1 telecommunications interface applications without circuit modification.

Frequently Asked Questions (FAQ)

Q: Are PM4351-RI and PM4351-RGI electrically interchangeable?

A: Yes. Both parts are identical in electrical specifications, including supply voltage (3.3V), operating temperature range (-40°C ~ 85°C), and interface standards (E1, J1, T1). No circuit modifications are required for substitution.

Q: What is the difference between these two part numbers?

A: The primary differences are product status, RoHS compliance, and packaging. PM4351-RGI is an active product with RoHS3 compliance and tray packaging, while PM4351-RI is obsolete and RoHS non-compliant. Functionally, they are equivalent.

Q: Can I use PM4351-RGI as a drop-in replacement for PM4351-RI?

A: Yes. The 80-MQFP (14x14) surface mount package, pin configuration, and electrical characteristics are identical. No PCB layout changes are necessary.

Q: Does the packaging type (tray vs. unspecified) affect compatibility?

A: No. Packaging type affects only handling, storage, and logistics. The component itself and its electrical performance are unaffected by packaging format.

Q: Why is PM4351-RI marked as obsolete?

A: Obsolescence indicates that Microchip Technology has discontinued active production and support for this part number. PM4351-RGI is the active equivalent for new designs and ongoing procurement.

Q: Are there any compliance considerations when substituting these parts?

A: Yes. If your application or market requires RoHS3 or REACH compliance, PM4351-RGI must be used. PM4351-RI does not meet these standards and may not be acceptable for regulated applications.