49FCT805BTPYG Clock Fanout Buffer Equivalent & Substitute Parts

Part Overview

The 49FCT805BTPYG is a Clock Fanout Buffer (Distribution) IC manufactured by Renesas Electronics Corporation, designed for 1:5 clock distribution applications in 20-SSOP surface mount packaging. This part is classified as obsolete, making identification of active equivalent substitutes necessary for ongoing design support and procurement continuity. The 49FCT805BTPYG operates within the 49FCT series and maintains compatibility with CMOS and LVTTL logic families, supporting supply voltages from 4.5V to 5.5V across an operating temperature range of 0°C to 70°C.

Substiute Parts

49FCT805BTPYG

Renesas Electronics CorporationIn Stock: 99649FCT805BTPYG Datasheet

Current PartRFQ

PI49FCT3805CHE

Diodes IncorporatedIn Stock: 4494PI49FCT3805CHE Datasheet

MFR RecommendedRFQ

PI49FCT3805DHEX

Diodes IncorporatedIn Stock: 6960PI49FCT3805DHEX Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 49FCT805BTPYG is based on the following critical parameters that must remain consistent across equivalent parts:

Mandatory Compatibility Parameters:

• Package / Case: 20-SSOP (0.209", 5.30mm Width) — physical and electrical footprint compatibility
• Type: Fanout Buffer (Distribution) — functional classification
• Number of Circuits: 2 — internal circuit count
• Ratio - Input:Output: 1:5 — distribution ratio specification
• Mounting Type: Surface Mount — assembly method compatibility

Functional Logic Parameters:

• Input Logic Family: CMOS, TTL compatibility required
• Output Logic Family: CMOS compatibility required
• Differential - Input:Output: No/No — non-differential signaling

Environmental & Compliance Parameters:

• Moisture Sensitivity Level (MSL): 1 (Unlimited) — handling and storage compatibility
• REACH Status: REACH Unaffected — regulatory alignment

The substitute parts PI49FCT3805CHE and PI49FCT3805DHEX, both manufactured by Diodes Incorporated, satisfy all mandatory compatibility parameters. Both parts maintain the 20-SSOP package footprint, 1:5 distribution ratio, and 2-circuit configuration. The primary differences between substitutes relate to maximum frequency specification (100 MHz vs. 133 MHz) and supply voltage range (3V ~ 3.6V vs. the original 4.5V ~ 5.5V), which represent functional enhancements rather than compatibility restrictions.

Parameter Comparison

Engineering Selection Recommendations

Both PI49FCT3805CHE and PI49FCT3805DHEX are active products with current manufacturing status, providing long-term availability and supply chain stability compared to the obsolete 49FCT805BTPYG. Both substitutes maintain identical package footprints and functional distribution ratios, enabling direct board-level replacement without layout modifications.

The PI49FCT3805DHEX offers the highest maximum frequency specification at 133 MHz, compared to 100 MHz for the PI49FCT3805CHE. Selection between these two substitutes should be based on application frequency requirements and supply voltage compatibility with the target system design.

Both substitute parts achieve ROHS3 compliance and maintain REACH Unaffected status, aligning with current environmental and regulatory requirements. The extended operating temperature range (-40°C ~ 85°C) of both substitutes exceeds the original part specification (0°C ~ 70°C), providing broader environmental applicability.

Supply voltage compatibility requires design review: the original 49FCT805BTPYG operates at 4.5V ~ 5.5V, while both substitutes operate at 3V ~ 3.6V. System designs operating at 5V supply voltage require voltage regulation or level shifting to accommodate the lower supply range of the substitute parts.

Frequently Asked Questions (FAQ)

Q: Can PI49FCT3805CHE and PI49FCT3805DHEX be used interchangeably with the 49FCT805BTPYG?

A: Both parts maintain identical package footprints (20-SSOP), circuit counts (2), and distribution ratios (1:5), enabling direct physical replacement. Functional compatibility is confirmed across input/output logic families (CMOS, TTL) and moisture sensitivity levels. Supply voltage range differences require design verification to ensure system compatibility.

Q: What is the primary difference between PI49FCT3805CHE and PI49FCT3805DHEX?

A: The maximum frequency specification differs: PI49FCT3805CHE supports 100 MHz, while PI49FCT3805DHEX supports 133 MHz. Both parts share identical package, circuit configuration, and supply voltage specifications. Selection should be based on application frequency requirements.

Q: Why does the supply voltage range differ between the original and substitute parts?

A: The original 49FCT805BTPYG operates at 4.5V ~ 5.5V, while PI49FCT3805CHE and PI49FCT3805DHEX operate at 3V ~ 3.6V. This represents a design evolution toward lower-voltage operation. Systems designed for 5V operation require voltage regulation or level shifting to use these substitutes.

Q: Are the substitute parts RoHS compliant?

A: Yes, both PI49FCT3805CHE and PI49FCT3805DHEX are ROHS3 compliant. The original 49FCT805BTPYG RoHS status is not specified in available documentation.

Q: What is the moisture sensitivity level for these parts?

A: All three parts (original and both substitutes) maintain Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity restrictions for handling, storage, or assembly.

Q: Can these parts be used in extended temperature applications?

A: The original 49FCT805BTPYG operates from 0°C ~ 70°C. Both substitute parts extend this range to -40°C ~ 85°C, providing broader environmental applicability for extended temperature designs.