SY89537LMH Equivalent & Substitute Parts

Part Overview

The SY89537LMH is a Clock/Frequency Synthesizer IC manufactured by Microchip Technology, designed for precision timing applications requiring up to 756MHz output frequency. This component features a Phase-Locked Loop (PLL) architecture with flexible input and output configurations supporting multiple signal standards including LVDS, LVPECL, CMOS, HSTL, LVTTL, SSTL, and Crystal inputs.

The SY89537LMH is classified as Obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for systems utilizing this clock synthesizer.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
Category	Clock/Timing
Type	Clock/Frequency Synthesizer
Series	Precision Edge®
Package / Case	44-VFQFN Exposed Pad, 44-MLF® (7x7)
Mounting Type	Surface Mount
Frequency - Max	756MHz
Voltage - Supply	2.375V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Input Signals	CMOS, HSTL, LVDS, LVPECL, LVTTL, SSTL, Crystal
Output Signals	LVDS, LVPECL
PLL	Yes
Number of Circuits	1
Ratio - Input:Output	3:7
Differential - Input:Output	Yes/Yes
Divider/Multiplier	Yes/No
RoHS Status	ROHS3 Compliant
REACH Status	REACH Unaffected
ECCN	EAR99
HTSUS Code	8542.39.0001

Substitute Part Grouping Explanation

Substitution of the SY89537LMH is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Frequency maximum: 756MHz
Supply voltage range: 2.375V ~ 3.6V
Operating temperature range: -40°C ~ 85°C
Input signal standards: CMOS, HSTL, LVDS, LVPECL, LVTTL, SSTL, Crystal
Output signal standards: LVDS, LVPECL
PLL architecture: Present
Input:Output ratio: 3:7
Differential input and output capability: Yes/Yes

Mechanical Equivalence Criteria:

Package type: 44-VFQFN Exposed Pad, 44-MLF® (7x7)
Mounting type: Surface Mount
Pin count and footprint: Identical

Compliance Equivalence Criteria:

RoHS3 Compliance
REACH Unaffected status
ECCN classification: EAR99

The SY89537LMY meets all electrical, mechanical, and compliance requirements for direct substitution with the SY89537LMH. The primary distinction between these parts is product status and packaging format.

Parameter Comparison

Parameter	SY89537LMH (Main Part)	SY89537LMY (Substitute)
Manufacturer	Microchip Technology	Microchip Technology
Base Product Number	SY89537	SY89537
Series	Precision Edge®	Precision Edge®
Product Status	Obsolete	Active
Package / Case	44-VFQFN Exposed Pad, 44-MLF® (7x7)	44-VFQFN Exposed Pad, 44-MLF® (7x7)
Packaging Format	Not specified	Tray
Frequency - Max	756MHz	756MHz
Voltage - Supply	2.375V ~ 3.6V	2.375V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Input Signals	CMOS, HSTL, LVDS, LVPECL, LVTTL, SSTL, Crystal	CMOS, HSTL, LVDS, LVPECL, LVTTL, SSTL, Crystal
Output Signals	LVDS, LVPECL	LVDS, LVPECL
PLL	Yes	Yes
Number of Circuits	1	1
Ratio - Input:Output	3:7	3:7
Differential - Input:Output	Yes/Yes	Yes/Yes
Divider/Multiplier	Yes/No	Yes/No
Mounting Type	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	2 (1 Year)
REACH Status	REACH Unaffected	REACH Unaffected
ECCN	EAR99	EAR99
HTSUS Code	8542.39.0001	8542.39.0001

Engineering Selection Recommendations

The SY89537LMY is a direct functional equivalent to the SY89537LMH. Both parts share identical electrical specifications, package geometry, and compliance certifications. The SY89537LMY is classified as Active product status, ensuring ongoing availability and manufacturing support from Microchip Technology.

Selection of the SY89537LMY over the obsolete SY89537LMH is supported by:

Identical electrical performance across all specified parameters
Identical mechanical compatibility and PCB footprint
Active product status with assured long-term supply
ROHS3 and REACH compliance maintained
Improved moisture sensitivity rating (MSL 2 versus MSL 3)
Tray packaging format suitable for automated assembly processes

No design modifications, PCB layout changes, or firmware adjustments are required when transitioning from SY89537LMH to SY89537LMY.

Frequently Asked Questions (FAQ)

Q: Can the SY89537LMY be used as a direct replacement for the SY89537LMH?

A: Yes. The SY89537LMY is electrically and mechanically equivalent to the SY89537LMH. All electrical parameters, signal standards, frequency specifications, supply voltage ranges, operating temperature ranges, and package dimensions are identical. No circuit modifications are required.

Q: What is the difference between the SY89537LMH and SY89537LMY?

A: The primary differences are product status and packaging format. The SY89537LMH is Obsolete, while the SY89537LMY is Active. The SY89537LMY is supplied in Tray packaging. The SY89537LMY also features an improved Moisture Sensitivity Level (MSL 2 versus MSL 3).

Q: Are there any pin configuration differences between these parts?

A: No. Both parts use the identical 44-VFQFN Exposed Pad package with 44-MLF® (7x7) dimensions. Pin assignments, signal routing, and PCB footprints are identical.

Q: Do both parts support the same input and output signal standards?

A: Yes. Both the SY89537LMH and SY89537LMY support identical input standards (CMOS, HSTL, LVDS, LVPECL, LVTTL, SSTL, Crystal) and output standards (LVDS, LVPECL).

Q: Are there compliance or regulatory differences?

A: No. Both parts maintain ROHS3 compliance, REACH Unaffected status, and EAR99 ECCN classification. Both are subject to the same HTSUS code (8542.39.0001).

Q: What is the maximum operating frequency for both parts?

A: Both the SY89537LMH and SY89537LMY support a maximum frequency of 756MHz with a 3:7 input:output ratio.

Q: Are the supply voltage requirements identical?

A: Yes. Both parts operate within the identical supply voltage range of 2.375V to 3.6V and support the same operating temperature range of -40°C to 85°C.

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