SY89808LTG Equivalent & Substitute Parts

Part Overview

The SY89808LTG is a Clock Fanout Buffer (Distribution), Multiplexer, Translator IC manufactured by Microchip Technology. This device provides 2:9 clock distribution at 500 MHz with HSTL input and output capabilities in a 32-TQFP surface mount package. The part is classified as Obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

SY89808LTG

Microchip TechnologyIn Stock: 1023SY89808LTG 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

Substitution for the SY89808LTG is determined by the following critical parameters:

• Input:Output Ratio: Must be 2:9 to maintain functional equivalence in clock distribution architecture
• Maximum Frequency: Must support 500 MHz minimum operation
• Package Type: 32-TQFP or 32-LQFP (compatible pinout and footprint)
• Signal Compatibility: Input and output signal types must be compatible with system requirements
• Supply Voltage Range: Must overlap with or encompass the 3.15V ~ 3.45V requirement
• Operating Temperature Range: Must support -40°C ~ 85°C or a subset thereof
• RoHS Compliance: ROHS3 Compliant status required for regulatory alignment

Two substitute parts meet these criteria:

8531AY-01LF (Renesas Electronics Corporation): Matches 2:9 ratio and 500 MHz frequency with compatible signal types (LVPECL output). Operates at 0°C ~ 70°C, which is a subset of the original temperature range. Supply voltage 3.135V ~ 3.465V overlaps the original specification.

853S031BYILF (Renesas Electronics Corporation): Matches 2:9 ratio with enhanced frequency capability (1.6 GHz). Supports wider supply voltage range (2.375V ~ 3.465V) and full temperature range (-40°C ~ 85°C). Active product status provides long-term availability.

Parameter Comparison

Engineering Selection Recommendations

For applications requiring exact parameter matching within the original specification range:

The 853S031BYILF is the preferred substitute. It maintains the 2:9 input:output ratio, supports the full -40°C ~ 85°C operating temperature range, and provides active product status ensuring continued availability and manufacturing support. The enhanced frequency capability (1.6 GHz) provides operational margin beyond the 500 MHz requirement. The wider supply voltage range (2.375V ~ 3.465V) accommodates system variations. ROHS3 compliance is maintained.

For applications with relaxed temperature requirements:

The 8531AY-01LF provides an alternative with identical 2:9 ratio and 500 MHz frequency specification. This part is suitable for systems operating within the 0°C ~ 70°C range. Supply voltage compatibility (3.135V ~ 3.465V) overlaps the original specification. ROHS3 compliance is maintained. Note that this part carries Obsolete status.

For new designs:

The 853S031BYILF is recommended due to Active product status, ensuring long-term supply chain stability and manufacturing consistency.

Frequently Asked Questions (FAQ)

Q: Can the 8531AY-01LF be used as a direct replacement for the SY89808LTG?

A: The 8531AY-01LF maintains functional equivalence for the 2:9 clock distribution function at 500 MHz. However, the operating temperature range is restricted to 0°C ~ 70°C compared to the original -40°C ~ 85°C. Output signal type differs (LVPECL vs. HSTL), requiring verification of downstream signal compatibility. The 32-LQFP package is footprint-compatible with 32-TQFP.

Q: What is the primary advantage of the 853S031BYILF?

A: The 853S031BYILF provides Active product status, ensuring ongoing manufacturing support and supply availability. It supports the full -40°C ~ 85°C temperature range matching the original part, maintains the 2:9 ratio, and offers enhanced frequency capability (1.6 GHz) providing operational margin. The wider supply voltage range (2.375V ~ 3.465V) accommodates system variations.

Q: Are the 32-TQFP and 32-LQFP packages pin-compatible?

A: Both packages are 32-pin configurations with compatible pinouts for clock distribution applications. PCB footprint verification is required to confirm mechanical compatibility with existing designs.

Q: Do all substitute parts maintain ROHS3 compliance?

A: Yes. Both 8531AY-01LF and 853S031BYILF are ROHS3 Compliant, maintaining regulatory alignment with the original SY89808LTG.

Q: What signal type compatibility must be verified when substituting?

A: The original SY89808LTG outputs HSTL signals. The 8531AY-01LF outputs LVPECL, and the 853S031BYILF outputs ECL or PECL. Downstream receiver compatibility with these signal types must be confirmed before implementation.