SY89873LMI-TR Equivalent & Substitute Parts

Part Overview

The SY89873LMI-TR is a Clock Fanout Buffer (Distribution), Divider IC manufactured by Microchip Technology, operating at a maximum frequency of 2 GHz with a 1:3 input-to-output ratio. This component is designed for precision clock distribution applications requiring differential LVDS output from multiple input signal types (CML, HSTL, LVDS, LVPECL). The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing system designs and maintenance applications.

Substiute Parts

SY89873LMI-TR

Microchip TechnologyIn Stock: 760SY89873LMI-TR Datasheet

Current PartRFQ

SY89876LMG-TR

Microchip TechnologyIn Stock: 2756SY89876LMG-TR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SY89873LMI-TR is determined by the following critical parameters:

• Frequency Capability: Maximum operating frequency must be 2 GHz or greater
• Input/Output Ratio: The fanout ratio (1:3 for the main part) defines the number of output channels available from a single input
• Signal Compatibility: Input acceptance of CML, HSTL, LVDS, and LVPECL signals; LVDS output requirement
• Package Compatibility: Identical 16-VFQFN Exposed Pad, 16-MLF® (3x3) surface mount package
• Supply Voltage Range: 2.97V ~ 3.63V operating range
• Temperature Range: -40°C ~ 85°C operating specification

The SY89876LMG-TR is identified as a parametric equivalent based on matching frequency, package, supply voltage, temperature range, input signal types, and output signal type. The primary difference is the input-to-output ratio (1:2 versus 1:3), which represents a functional variation rather than a direct pin-for-pin replacement.

Parameter Comparison

Engineering Selection Recommendations

The SY89876LMG-TR is available as an active product with ROHS3 compliance, addressing the regulatory and supply chain limitations of the discontinued SY89873LMI-TR. Both components share identical electrical specifications for frequency, supply voltage, operating temperature, and signal compatibility. The substitution is valid for applications where a 1:2 fanout ratio meets system requirements. Applications requiring exactly three output channels from a single input must evaluate alternative clock distribution solutions within the Microchip Precision Edge® series or equivalent product lines from other manufacturers.

Frequently Asked Questions (FAQ)

Q: Can the SY89876LMG-TR directly replace the SY89873LMI-TR in existing designs?

A: Direct replacement is possible only if the system design can accommodate a 1:2 output ratio instead of 1:3. The electrical characteristics, package footprint, and signal types are identical. PCB layout and routing remain compatible.

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

A: The SY89873LMI-TR provides three LVDS output channels from a single input (1:3 ratio), while the SY89876LMG-TR provides two output channels (1:2 ratio). All other specifications are equivalent.

Q: Are there compliance differences between the two parts?

A: Yes. The SY89876LMG-TR is ROHS3 compliant with MSL 2 (1 Year), while the SY89873LMI-TR is RoHS non-compliant with MSL 1 (Unlimited). Both are REACH Unaffected and classified as EAR99.

Q: Does the package footprint differ between these parts?

A: No. Both components use the identical 16-VFQFN Exposed Pad, 16-MLF® (3x3) surface mount package. PCB layout and assembly processes are interchangeable.

Q: What input signal types are supported by the SY89876LMG-TR?

A: The SY89876LMG-TR accepts CML, HSTL, LVDS, and LVPECL input signals, identical to the SY89873LMI-TR. Output is LVDS in both cases.

Q: Are the supply voltage and operating temperature ranges the same?

A: Yes. Both parts operate at 2.97V ~ 3.63V supply voltage and -40°C ~ 85°C operating temperature range.