PI49FCT3805BQEX Clock Fanout Buffer IC - Equivalent & Substitute Parts

Part Overview

The PI49FCT3805BQEX is an active Clock Fanout Buffer (Distribution) IC manufactured by Diodes Incorporated, designed for clock distribution applications requiring 1:5 signal fanout at frequencies up to 80 MHz. This 20-SSOP surface mount device operates across the 3V to 3.6V supply range and maintains active product status with full RoHS3 compliance. Equivalent and substitute parts are identified based on matching electrical specifications, package compatibility, and operational parameters to ensure direct functional replacement in clock distribution circuits.

Key Parameters

Parameter	Value
Manufacturer Part Number	PI49FCT3805BQEX
Manufacturer	Diodes Incorporated
Product Category	Clock/Timing - Fanout Buffer (Distribution)
Series	49FCT
Type	Fanout Buffer (Distribution)
Number of Circuits	2
Ratio - Input:Output	1:5
Frequency - Max	80 MHz
Input Logic	CMOS, TTL
Output Logic	CMOS
Voltage - Supply	3V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package / Case	20-SSOP (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Packaging Format	Tape & Reel (TR)
Product Status	Active
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the PI49FCT3805BQEX are identified from the 49FCT3805 base product family manufactured by Renesas Electronics Corporation. Substitution eligibility is determined by the following critical parameters:

Primary Substitution Criteria:

Base product number: 49FCT3805
Package / Case: 20-SSOP (0.154", 3.90mm Width)
Number of Circuits: 2
Ratio - Input:Output: 1:5
Voltage - Supply: 3V ~ 3.6V
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Secondary Compatibility Parameters:

Frequency - Max: 80 MHz or higher
Operating Temperature: -40°C ~ 85°C (full industrial range)
Input Logic: CMOS, LVTTL
Output Logic: CMOS, LVTTL

Parts meeting all primary criteria are direct functional equivalents. Parts with extended frequency specifications (166 MHz) or narrower temperature ranges (0°C ~ 70°C) remain compatible but with noted operational differences.

Parameter Comparison

Parameter	PI49FCT3805BQEX	49FCT3805AQG	49FCT3805AQG8	49FCT3805AQGI	49FCT3805AQGI8	49FCT3805DQGI	49FCT3805EQGI	49FCT3805QG	49FCT3805QGI
Manufacturer	Diodes Inc.	Renesas	Renesas	Renesas	Renesas	Renesas	Renesas	Renesas	Renesas
Series	49FCT	49FCT	49FCT	49FCT	49FCT	49FCT	49FCT	49FCT	49FCT
Base Product Number	PI49FCT3805	49FCT3805	49FCT3805	49FCT3805	49FCT3805	49FCT3805	49FCT3805	49FCT3805	49FCT3805
Type	Fanout Buffer	Fanout Buffer	Fanout Buffer	Fanout Buffer	Fanout Buffer	Fanout Buffer	Fanout Buffer	Fanout Buffer	Fanout Buffer
Number of Circuits	2	2	2	2	2	2	2	2	2
Ratio - Input:Output	1:5	1:5	1:5	1:5	1:5	1:5	1:5	1:5	1:5
Frequency - Max	80 MHz	Not specified	Not specified	Not specified	Not specified	166 MHz	166 MHz	Not specified	Not specified
Input Logic	CMOS, TTL	CMOS, LVTTL	CMOS, LVTTL	CMOS, LVTTL	CMOS, LVTTL	CMOS, LVTTL	CMOS, LVTTL	CMOS, LVTTL	CMOS, LVTTL
Output Logic	CMOS	CMOS, LVTTL	CMOS, LVTTL	CMOS, LVTTL	CMOS, LVTTL	CMOS, LVTTL	CMOS, LVTTL	CMOS, LVTTL	CMOS, LVTTL
Voltage - Supply	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C
Package / Case	20-SSOP	20-SSOP	20-SSOP	20-SSOP	20-SSOP	20-SSOP	20-SSOP	20-SSOP	20-SSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Packaging Format	Tape & Reel	Tube	Cut Tape	Tube	Tape & Reel	Tube	Tube	Tube	Tube
Product Status	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All substitute parts listed maintain active product status and full RoHS3 compliance, ensuring regulatory alignment with the original PI49FCT3805BQEX. Selection among substitutes depends on specific application requirements:

Full Industrial Temperature Range (-40°C ~ 85°C): 49FCT3805AQGI, 49FCT3805AQGI8, 49FCT3805DQGI, 49FCT3805EQGI, and 49FCT3805QGI provide identical operating temperature coverage to the original part and are suitable for applications requiring extended temperature performance.

Commercial Temperature Range (0°C ~ 70°C): 49FCT3805AQG and 49FCT3805QG operate within a narrower temperature band and are applicable to commercial-grade clock distribution circuits where full industrial temperature range is not required.

Extended Frequency Capability: 49FCT3805DQGI and 49FCT3805EQGI support maximum frequencies of 166 MHz, providing headroom above the original 80 MHz specification while maintaining all other electrical and mechanical compatibility parameters.

Packaging Format Considerations: Tape & Reel (TR) format is available in 49FCT3805AQGI8 for high-volume automated assembly. Cut Tape (CT) format is available in 49FCT3805AQG8 for mixed-volume or prototype applications. Tube packaging is available across multiple variants for lower-volume requirements.

Frequently Asked Questions (FAQ)

Q: Can 49FCT3805AQGI be used as a direct replacement for PI49FCT3805BQEX?

A: Yes. The 49FCT3805AQGI meets all primary substitution criteria: identical 1:5 fanout ratio, 20-SSOP package, 3V to 3.6V supply voltage, 2-circuit configuration, and full industrial temperature range (-40°C ~ 85°C). Both parts are RoHS3 compliant with MSL rating 1. The primary difference is packaging format (Tube vs. Tape & Reel) and manufacturer (Renesas vs. Diodes).

Q: What is the difference between 49FCT3805AQGI and 49FCT3805DQGI?

A: Both parts are functionally equivalent in terms of fanout ratio, package, supply voltage, and temperature range. The primary difference is maximum frequency: 49FCT3805AQGI does not specify a frequency limit, while 49FCT3805DQGI specifies 166 MHz maximum. For applications operating at or below 80 MHz, both are suitable. For applications requiring higher frequency headroom, 49FCT3805DQGI is specified.

Q: Are parts with 0°C ~ 70°C operating temperature compatible with -40°C ~ 85°C applications?

A: No. Parts such as 49FCT3805AQG and 49FCT3805QG with 0°C ~ 70°C operating temperature range are not suitable for applications requiring full industrial temperature operation (-40°C ~ 85°C). These parts are restricted to commercial-grade applications within their specified temperature limits.

Q: Does packaging format affect electrical performance?

A: No. Tape & Reel (TR), Cut Tape (CT), and Tube packaging formats contain identical die and electrical specifications. Packaging format selection is determined by assembly process requirements and volume considerations, not electrical performance.

Q: Are all substitute parts REACH compliant?

A: Yes. All substitute parts listed carry REACH Unaffected status, matching the original PI49FCT3805BQEX specification.

Q: Can I use 49FCT3805EQGI in place of PI49FCT3805BQEX?

A: Yes. The 49FCT3805EQGI is electrically and mechanically compatible with the original part. It provides 166 MHz maximum frequency capability, exceeding the original 80 MHz specification, while maintaining identical supply voltage, package, fanout ratio, and full industrial temperature range operation.

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