SY89809LTH Equivalent & Substitute Parts

Part Overview

The SY89809LTH is a Clock Fanout Buffer (Distribution) Multiplexer IC manufactured by Microchip Technology, designed for 2:9 clock distribution at frequencies up to 500 MHz. This device features HSTL and LVPECL input compatibility with HSTL output capability, housed in a 32-TQFP surface mount package. The product is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

SY89809LTH

Microchip TechnologyIn Stock: 3170SY89809LTH Datasheet

Current PartRFQ

8531AY-01LF

Renesas Electronics CorporationIn Stock: 10188531AY-01LF Datasheet

MFR RecommendedRFQ

853S031BYILF

Renesas Electronics CorporationIn Stock: 1312853S031BYILF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SY89809LTH are qualified based on the following critical parameters:

• Input:Output Ratio: Must maintain 2:9 configuration for direct functional replacement
• Package Compatibility: 32-TQFP (7x7) footprint ensures PCB layout compatibility
• Frequency Performance: Minimum 500 MHz operation required; higher frequency capability acceptable
• Supply Voltage Range: Must accommodate 3V ~ 3.6V nominal operation
• Differential Signaling: Input and output must support differential signal processing
• Surface Mount Technology: Consistent with original mounting requirements
• Regulatory Compliance: ROHS3 and REACH compliance maintained across substitutes

Two qualified substitutes are identified: the 8531AY-01LF (Renesas Electronics, 500 MHz maximum frequency, obsolete status) and the 853S031BYILF (Renesas Electronics, 1.6 GHz maximum frequency, active product status).

Parameter Comparison

Engineering Selection Recommendations

For Direct Frequency-Matched Replacement (500 MHz Operation): The 8531AY-01LF provides functional equivalence at the original 500 MHz specification. This substitute maintains identical input:output ratio, differential signaling capability, and package footprint. However, the operating temperature range is limited to 0°C ~ 70°C compared to the original 0°C ~ 85°C specification. The product status is obsolete, presenting similar long-term availability constraints as the original part.

For Active Product Status with Enhanced Performance: The 853S031BYILF is an active product offering superior frequency capability at 1.6 GHz maximum operation, extended operating temperature range (-40°C ~ 85°C), and broader supply voltage tolerance (2.375V ~ 3.465V). This substitute accommodates the original 500 MHz requirement with performance margin and provides extended product lifecycle support. The package designation changes from 32-TQFP to 32-LQFP; both are 7x7mm footprints with identical pin counts and compatible PCB layouts.

Selection between substitutes depends on system requirements: choose 8531AY-01LF for exact frequency matching with existing designs, or 853S031BYILF for new implementations requiring active product status and extended operational margins.

Frequently Asked Questions (FAQ)

Q: Can the 853S031BYILF directly replace the SY89809LTH in existing designs? A: Yes. Both devices maintain the 2:9 input:output ratio, differential signaling architecture, and 32-pin surface mount package footprint. The 1.6 GHz maximum frequency exceeds the 500 MHz requirement, providing operational margin. Pin compatibility and functional behavior are preserved.

Q: What is the difference between 32-TQFP and 32-LQFP packages? A: Both designations refer to 32-pin surface mount packages with 7x7mm body dimensions. TQFP (Thin Quad Flat Pack) and LQFP (Low-profile Quad Flat Pack) are functionally equivalent for PCB layout purposes. Pin pitch, spacing, and soldering requirements are identical.

Q: Why is the 8531AY-01LF also obsolete? A: The 8531AY-01LF is classified as obsolete by the manufacturer, indicating discontinued production. While currently available in inventory (934 units), long-term sourcing cannot be guaranteed. For new designs, the 853S031BYILF active product status provides superior lifecycle support.

Q: Does the supply voltage range difference affect compatibility? A: The 8531AY-01LF operates within 3.135V ~ 3.465V, which overlaps the original 3V ~ 3.6V specification. The 853S031BYILF extends the lower limit to 2.375V, providing broader tolerance. Both substitutes function within the original design voltage specification.

Q: What input signal types are supported by the substitute parts? A: The 8531AY-01LF and 853S031BYILF accept CML, HCSL, LVDS, LVHSTL, LVPECL, and SSTL input signals, exceeding the original HSTL and LVPECL support. This expanded input compatibility provides design flexibility without compromising the original specification.

Q: Are there temperature range limitations with the 8531AY-01LF? A: The 8531AY-01LF operates from 0°C ~ 70°C, which is narrower than the original 0°C ~ 85°C range. Applications requiring operation above 70°C must use the 853S031BYILF (-40°C ~ 85°C).