SY89321LMI-TR Equivalent & Substitute Parts

Part Overview

The SY89321LMI-TR is a mixed signal translator manufactured by Microchip Technology, designed to convert unidirectional signals from CML, LVDS, or LVPECL input levels to LVTTL output levels. This component is packaged in an 8-MLF® (2x2) surface mount configuration and operates across the industrial temperature range of -40°C to 85°C.

The SY89321LMI-TR is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives. Substitute parts must maintain identical electrical characteristics, signal conversion capabilities, and thermal operating specifications to ensure direct replacement without circuit redesign.

Key Parameters

Parameter	Value
Translator Type	Mixed Signal
Channel Type	Unidirectional
Number of Circuits	1
Channels per Circuit	1
Input Signal	CML, LVDS, LVPECL
Output Signal	LVTTL
Output Type	Non-Inverted
Operating Temperature	-40°C to 85°C (TA)
Mounting Type	Surface Mount
Package / Case	8-VFDFN Exposed Pad, 8-MLF®
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SY89321LMI-TR is determined by strict equivalence across the following critical parameters:

Translator Type: Must be Mixed Signal
Channel Configuration: Must be Unidirectional, 1 Circuit, 1 Channel per Circuit
Input Signal Compatibility: Must accept CML, LVDS, and LVPECL inputs
Output Signal: Must produce LVTTL output at minimum
Output Polarity: Must be Non-Inverted
Operating Temperature Range: Must support -40°C to 85°C
Moisture Sensitivity: Must be MSL 1 or equivalent
Physical Compatibility: Package must be compatible with 8-MLF® footprint requirements

Two substitute parts meet these criteria:

SY89321LMG-TR (Microchip Technology) — Same base product with alternative packaging format
MC100EPT21MNR4G (onsemi) — Cross-manufacturer equivalent with compatible electrical and thermal specifications

Parameter Comparison

Parameter	SY89321LMI-TR	SY89321LMG-TR	MC100EPT21MNR4G
Manufacturer	Microchip Technology	Microchip Technology	onsemi
Translator Type	Mixed Signal	Mixed Signal	Mixed Signal
Channel Type	Unidirectional	Unidirectional	Unidirectional
Number of Circuits	1	1	1
Channels per Circuit	1	1	1
Input Signal	CML, LVDS, LVPECL	CML, LVDS, LVPECL	CML, LVDS, LVPECL
Output Signal	LVTTL	LVTTL	LVTTL, LVCMOS
Output Type	Non-Inverted	Non-Inverted	Non-Inverted
Operating Temperature	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	8-VFDFN Exposed Pad, 8-MLF®	8-VFDFN Exposed Pad, 8-MLF®	8-VFDFN Exposed Pad, 8-DFN
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Discontinued at DiGi Electronics	Active	Active
RoHS Status	RoHS Non-Compliant	RoHS3 Compliant	RoHS3 Compliant

Engineering Selection Recommendations

SY89321LMG-TR is the primary substitute for the SY89321LMI-TR. Both parts share the identical base product number (SY89321) and are manufactured by Microchip Technology. The SY89321LMG-TR differs only in packaging format (Cut Tape & Digi-Reel® versus Tape & Reel) and holds active product status with RoHS3 compliance. This part provides direct functional equivalence with improved regulatory compliance and current availability.

MC100EPT21MNR4G serves as a secondary cross-manufacturer substitute from onsemi. It maintains all critical electrical parameters, signal conversion specifications, and thermal operating range. The MC100EPT21MNR4G offers expanded output signal capability (LVTTL and LVCMOS) and is actively produced with RoHS3 compliance. Package compatibility requires verification of PCB footprint alignment, as the 8-DFN designation may differ slightly from the 8-MLF® standard, though both are 8-pin, 2x2mm configurations.

Selection between these substitutes depends on supply chain availability, packaging requirements, and regulatory compliance mandates for the end application.

Frequently Asked Questions (FAQ)

Q: Can SY89321LMG-TR directly replace SY89321LMI-TR without PCB modifications?

A: Yes. Both parts use the same 8-MLF® (2x2) package footprint and are electrically identical. The only difference is the packaging format (tape reel type), which does not affect circuit performance or board layout.

Q: What is the key difference between SY89321LMI-TR and MC100EPT21MNR4G?

A: Both parts are functionally equivalent mixed signal translators with identical input/output signal specifications and operating temperature ranges. The primary differences are manufacturer (Microchip versus onsemi), package designation (8-MLF® versus 8-DFN), and output signal capability (MC100EPT21MNR4G supports both LVTTL and LVCMOS). PCB footprint compatibility must be verified before substitution.

Q: Why is RoHS compliance status different between the main part and substitutes?

A: The SY89321LMI-TR is marked as RoHS non-compliant, indicating it was manufactured before or outside RoHS3 requirements. Both substitute parts (SY89321LMG-TR and MC100EPT21MNR4G) are RoHS3 compliant, reflecting current manufacturing standards. This difference does not affect electrical performance but may be relevant for regulatory requirements in the end application.

Q: Are there any thermal or electrical performance differences between these three parts?

A: No. All three parts operate across the identical temperature range (-40°C to 85°C) and provide equivalent signal translation performance. Electrical characteristics, input/output specifications, and reliability are equivalent across all three options.

Q: What should be verified before selecting MC100EPT21MNR4G as a substitute?

A: Verify PCB footprint compatibility between the 8-MLF® and 8-DFN packages. Although both are 8-pin, 2x2mm surface mount configurations, pin layout and pad dimensions may differ. Consult the respective datasheets and PCB design files to confirm mechanical fit before committing to this substitution.

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