SY89809ALTZ Equivalent & Substitute Parts

Part Overview

The SY89809ALTZ is a Clock Fanout Buffer (Distribution) Multiplexer IC manufactured by Microchip Technology, designed for high-speed clock distribution applications. This 2:9 ratio device operates at a maximum frequency of 750 MHz and is housed in a 32-TQFP surface mount package. The part is currently in active production status with 2200 units available in inventory.

Finding equivalent and substitute parts for the SY89809ALTZ becomes necessary when addressing supply chain constraints, design optimization requirements, or when transitioning between product lifecycles. The substitute parts listed below maintain functional compatibility through equivalent input/output ratios, package compatibility, and overlapping electrical specifications.

Substiute Parts

SY89809ALTZ

Microchip TechnologyIn Stock: 2274SY89809ALTZ 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 SY89809ALTZ are qualified based on the following critical parameters that determine functional interchangeability:

Primary Compatibility Criteria:

• Input:Output Ratio: 2:9 (maintained across all substitutes)
• Package Type: 32-TQFP/32-LQFP (7x7 footprint compatibility)
• Differential Input and Output capability (required for signal integrity)
• Surface mount configuration

Secondary Compatibility Factors:

• Frequency range overlap with the 750 MHz maximum specification
• Supply voltage compatibility within the 3V ~ 3.6V range or broader ranges that encompass this window
• Operating temperature range that covers or exceeds 0°C ~ 85°C
• RoHS3 compliance and REACH unaffected status

The two substitute parts identified—8531AY-01LF and 853S031BYILF—both maintain the 2:9 input:output ratio and 32-TQFP package footprint. However, they differ in maximum frequency capability and operating temperature ranges, which affects their suitability for specific applications.

Parameter Comparison

Engineering Selection Recommendations

SY89809ALTZ (Primary Part - Active Status)

The SY89809ALTZ remains the preferred choice for new designs and ongoing production. As an active product with unlimited moisture sensitivity rating (MSL 1), it offers superior supply chain stability and handling flexibility. The 750 MHz maximum frequency and 3V ~ 3.6V supply range align with standard 3.3V logic systems.

853S031BYILF (Recommended Substitute - Active Status)

The 853S031BYILF is the preferred substitute when SY89809ALTZ availability is constrained. This part maintains active product status and offers superior frequency capability (1.6 GHz), making it suitable for applications requiring higher clock speeds. The extended operating temperature range (-40°C ~ 85°C) provides additional thermal margin. The broader supply voltage range (2.375V ~ 3.465V) accommodates wider system designs. However, the MSL 3 rating requires controlled moisture exposure during storage and handling.

8531AY-01LF (Secondary Substitute - Obsolete Status)

The 8531AY-01LF is classified as obsolete and should be avoided for new designs. While it maintains the 2:9 ratio and compatible package, the 500 MHz maximum frequency is below the SY89809ALTZ specification. The reduced operating temperature range (0°C ~ 70°C) and MSL 3 rating further limit its applicability. This part is suitable only for legacy system maintenance where existing inventory exists.

Frequently Asked Questions (FAQ)

Q: Can 853S031BYILF directly replace SY89809ALTZ in existing designs?

A: Yes, from a functional and mechanical standpoint. Both parts maintain the 2:9 input:output ratio, 32-TQFP package footprint, and differential input/output capability. The 853S031BYILF's higher frequency rating (1.6 GHz vs. 750 MHz) and extended temperature range provide additional design margin. The primary consideration is moisture sensitivity handling (MSL 3 vs. MSL 1), which requires appropriate storage and assembly procedures.

Q: Why is 8531AY-01LF listed as a substitute if it is obsolete?

A: The 8531AY-01LF is included in the substitute list because it maintains the core 2:9 ratio and package compatibility. However, its obsolete status and reduced frequency specification (500 MHz) make it unsuitable for new designs. It is referenced only for legacy system support where existing inventory may be available.

Q: What are the key differences in supply voltage specifications?

A: The SY89809ALTZ operates within 3V ~ 3.6V, which is optimized for 3.3V systems. The 853S031BYILF accepts 2.375V ~ 3.465V, providing compatibility with both 2.5V and 3.3V supply rails. The 8531AY-01LF range (3.135V ~ 3.465V) is narrower and centered on 3.3V operation.

Q: How does the operating temperature range affect part selection?

A: The SY89809ALTZ covers 0°C ~ 85°C, suitable for commercial and industrial applications. The 853S031BYILF extends to -40°C ~ 85°C, accommodating automotive and extended temperature environments. The 8531AY-01LF is limited to 0°C ~ 70°C, restricting its use in high-temperature applications.

Q: What is the significance of the Moisture Sensitivity Level (MSL) difference?

A: MSL 1 (SY89809ALTZ) indicates unlimited shelf life without moisture control. MSL 3 (853S031BYILF and 8531AY-01LF) requires storage at controlled humidity and has a 168-hour floor life after moisture exposure. This affects supply chain handling, storage infrastructure, and assembly scheduling but does not impact electrical performance.

Q: Are the input signal types compatible across all three parts?

A: The SY89809ALTZ accepts HSTL and LVPECL inputs. The 853S031BYILF and 8531AY-01LF accept CML, HCSL, LVDS, LVHSTL, LVPECL, and SSTL inputs. The broader input compatibility of the Renesas parts provides additional flexibility but does not affect substitution when the application uses HSTL or LVPECL signals.