SY87701LHG Equivalent & Substitute Parts

Part Overview

The SY87701LHG is a Clock and Data Recovery (CDR) multiplexer IC manufactured by Microchip Technology, designed for Ethernet, SONET/SDH, and ATM applications. Operating at 1.25Gbps with PECL input/output interfaces, this component is classified as obsolete. Due to its discontinued status, identifying compatible substitute parts is essential for system redesign, legacy system maintenance, and ensuring supply chain continuity.

Substiute Parts

SY87701LHG

Microchip TechnologyIn Stock: 2322SY87701LHG Datasheet

Current PartRFQ

SY87701ALHG

Microchip TechnologyIn Stock: 2299SY87701ALHG Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SY87701LHG is determined by strict alignment with the following critical parameters:

• Package and Pinout: 32-TQFP Exposed Pad (7x7) form factor with identical pin configuration
• Interface Standards: PECL input and output compatibility
• Supply Voltage: 3.15V ~ 3.45V operating range
• Operating Temperature Range: -40°C ~ 85°C
• Functional Architecture: Single-circuit CDR multiplexer with 3:3 input:output ratio and integrated PLL
• Compliance: ROHS3 and REACH compliance status
• Mounting Type: Surface mount technology

The SY87701ALHG meets all substitution criteria within these parameters. Both parts share identical electrical specifications, package geometry, and compliance certifications, enabling direct functional replacement in applications requiring CDR functionality for Ethernet, SONET/SDH, and ATM protocols.

Parameter Comparison

Engineering Selection Recommendations

The SY87701ALHG is the direct substitute for the obsolete SY87701LHG. Selection is based on the following engineering criteria:

Compliance and Certification: Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for current manufacturing standards.

Product Status: The SY87701ALHG is actively manufactured by Microchip Technology, providing assured supply availability and long-term support compared to the obsolete SY87701LHG.

Electrical and Mechanical Compatibility: Identical supply voltage range (3.15V ~ 3.45V), operating temperature range (-40°C ~ 85°C), package geometry (32-TQFP Exposed Pad 7x7), and interface specifications (PECL input/output) ensure drop-in replacement capability without circuit redesign.

Performance Specification: The SY87701ALHG operates at 1.3Gbps maximum frequency, exceeding the 1.25Gbps specification of the SY87701LHG, providing enhanced performance margin within the same electrical and thermal operating envelope.

Frequently Asked Questions (FAQ)

Q: Can the SY87701ALHG directly replace the SY87701LHG without PCB modifications?

A: Yes. Both parts share identical package geometry (32-TQFP Exposed Pad 7x7), pinout, supply voltage requirements (3.15V ~ 3.45V), and operating temperature range (-40°C ~ 85°C). No PCB layout changes are required.

Q: What is the primary difference between these two parts?

A: The SY87701ALHG operates at 1.3Gbps maximum frequency compared to the SY87701LHG at 1.25Gbps. The SY87701ALHG is actively manufactured, while the SY87701LHG is obsolete. All other electrical and mechanical specifications are identical.

Q: Are there any compliance or certification differences?

A: No. Both parts maintain ROHS3 compliance, REACH unaffected status, and identical MSL ratings (3, 168 Hours). Regulatory requirements are equivalent.

Q: What applications are these parts suitable for?

A: Both parts are designed for Ethernet, SONET/SDH, and ATM applications requiring Clock and Data Recovery functionality with PECL interface standards.

Q: Is the higher frequency specification of the SY87701ALHG a concern for legacy designs?

A: No. The SY87701ALHG maintains full backward compatibility. The higher 1.3Gbps specification provides additional performance margin and does not introduce incompatibility with systems designed for 1.25Gbps operation.

Q: What is the packaging difference between these parts?

A: The SY87701LHG is supplied in standard packaging, while the SY87701ALHG is supplied in Tray packaging. Both use identical 32-TQFP Exposed Pad (7x7) component packages suitable for surface mount assembly.