PI49FCT3805AS Equivalent & Substitute Parts

Part Overview

The PI49FCT3805AS is a Clock Fanout Buffer (Distribution) IC manufactured by Diodes Incorporated, designed for 1:5 clock distribution at frequencies up to 66 MHz. This component is classified as obsolete, which necessitates identification of active equivalent parts for ongoing design support and procurement. The part operates with CMOS and TTL inputs, delivering CMOS outputs in a 20-SOIC surface mount package.

Key Parameters

Parameter	Value
Manufacturer Part Number	PI49FCT3805AS
Manufacturer	Diodes Incorporated
Category	Clock/Timing
Type	Fanout Buffer (Distribution)
Series	49FCT
Number of Circuits	2
Ratio - Input:Output	1:5
Input Logic	CMOS, TTL
Output Logic	CMOS
Frequency - Max	66 MHz
Voltage - Supply	3V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the PI49FCT3805AS is determined by the following critical parameters:

Base Product Number: 49FCT3805 (all substitutes share this designation)
Package / Case: 20-SOIC (0.295", 7.50mm Width) (identical across all parts)
Ratio - Input:Output: 1:5 (functional requirement)
Number of Circuits: 2 (functional requirement)
Voltage - Supply: 3V ~ 3.6V (identical across all parts)
Mounting Type: Surface Mount (identical across all parts)

All four substitute parts are manufactured by Renesas Electronics Corporation and maintain the same electrical and mechanical specifications as the original part. The substitutes differ in packaging format (Tube vs. Tape & Reel) and operating temperature range, with two variants supporting the extended -40°C ~ 85°C range matching the original specification.

Parameter Comparison

Parameter	PI49FCT3805AS (Original)	49FCT3805SOG	49FCT3805SOG8	49FCT3805SOGI	49FCT3805SOGI8
Manufacturer	Diodes Incorporated	Renesas Electronics	Renesas Electronics	Renesas Electronics	Renesas Electronics
Product Status	Obsolete	Active	Active	Active	Active
Type	Fanout Buffer (Distribution)	Fanout Buffer (Distribution)	Fanout Buffer (Distribution)	Fanout Buffer (Distribution)	Fanout Buffer (Distribution)
Ratio - Input:Output	1:5	1:5	1:5	1:5	1:5
Number of Circuits	2	2	2	2	2
Input Logic	CMOS, TTL	CMOS, LVTTL	CMOS, LVTTL	CMOS, LVTTL	CMOS, LVTTL
Output Logic	CMOS	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
Operating Temperature	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)
Packaging Format	Not specified	Tube	Tape & Reel (TR)	Tube	Tape & Reel (TR)
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For applications requiring the extended operating temperature range of -40°C ~ 85°C, select either 49FCT3805SOGI or 49FCT3805SOGI8. These parts maintain full compatibility with the original PI49FCT3805AS temperature specification while offering active product status and ROHS3 compliance.

For applications operating within the 0°C ~ 70°C temperature range, 49FCT3805SOG or 49FCT3805SOG8 are suitable alternatives. These parts provide the same functional performance with reduced thermal operating range.

Packaging format selection depends on procurement and assembly requirements: Tube packaging (49FCT3805SOG, 49FCT3805SOGI) for lower-volume applications, or Tape & Reel format (49FCT3805SOG8, 49FCT3805SOGI8) for automated assembly processes.

All substitute parts are ROHS3 compliant, addressing regulatory requirements that the original obsolete part does not meet.

Frequently Asked Questions (FAQ)

Q: Can 49FCT3805SOG or 49FCT3805SOG8 be used in applications requiring -40°C ~ 85°C operation?

A: No. These parts are rated for 0°C ~ 70°C operation only. For extended temperature range applications, use 49FCT3805SOGI or 49FCT3805SOGI8.

Q: What is the difference between Tube and Tape & Reel packaging?

A: Tube packaging (SOG, SOGI) is suitable for manual assembly and lower-volume production. Tape & Reel format (SOG8, SOGI8) is designed for automated pick-and-place assembly equipment and higher-volume manufacturing.

Q: Are all substitute parts pin-compatible with the original PI49FCT3805AS?

A: Yes. All substitute parts use the identical 20-SOIC package with the same pin configuration and electrical interface.

Q: What is the significance of ROHS3 compliance?

A: ROHS3 compliance indicates the part meets current Restriction of Hazardous Substances regulations. The original PI49FCT3805AS is RoHS non-compliant and may not be acceptable for new designs or procurement in regulated markets.

Q: Do the substitute parts support the same input logic levels as the original?

A: The original part accepts CMOS and TTL inputs. Substitute parts accept CMOS and LVTTL inputs. LVTTL is compatible with TTL-level signals in most applications, but circuit-specific validation is required for critical timing applications.

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