PI49FCT3805QEX Equivalent & Substitute Parts

Part Overview

The PI49FCT3805QEX is an active Clock Fanout Buffer (Distribution) IC manufactured by Diodes Incorporated, designed for 1:5 clock distribution at 50 MHz maximum frequency. This 20-SSOP surface mount device operates across the industrial temperature range (-40°C to 85°C) and is compliant with ROHS3 and REACH standards. The part is currently in active production status with 6,148 units in stock.

Equivalent and substitute parts are necessary when the original manufacturer part becomes unavailable, when alternative packaging formats are required for production workflows, or when design specifications allow for compatible variants with different frequency ratings or temperature operating ranges.

Key Parameters

Parameter	Value
Manufacturer Part Number	PI49FCT3805QEX
Manufacturer	Diodes Incorporated
Series	49FCT
Type	Fanout Buffer (Distribution)
Ratio - Input:Output	1:5
Number of Circuits	2
Frequency - Max	50 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	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the PI49FCT3805QEX is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters for Substitution:

Ratio - Input:Output: 1:5 (must match exactly)
Number of Circuits: 2 (must match exactly)
Package / Case: 20-SSOP (0.154", 3.90mm Width) (must match exactly)
Voltage - Supply: 3V ~ 3.6V (must match exactly)
Mounting Type: Surface Mount (must match exactly)

Compatible Variation Parameters:

Manufacturer: Renesas Electronics Corporation variants are functionally equivalent
Frequency - Max: 50 MHz or higher (higher frequency parts are backward compatible)
Operating Temperature: -40°C ~ 85°C (industrial range) or 0°C ~ 70°C (commercial range, subset of industrial)
Input Logic: CMOS, TTL or CMOS, LVTTL (both support required input standards)
Output Logic: CMOS or CMOS, LVTTL (both support required output standards)
Packaging Format: Tape & Reel (TR), Cut Tape (CT), or Tube (all are equivalent delivery methods)

All substitute parts listed maintain the 49FCT base product number and are manufactured to the same electrical specifications within the allowed parameter ranges.

Parameter Comparison

Part Number	Manufacturer	Frequency - Max	Operating Temperature	Input Logic	Output Logic	Packaging Format	Inventory
PI49FCT3805QEX	Diodes Incorporated	50 MHz	-40°C ~ 85°C	CMOS, TTL	CMOS	Tape & Reel (TR)	6,148 Pcs
49FCT3805AQG	Renesas Electronics Corporation	50 MHz	0°C ~ 70°C	CMOS, LVTTL	CMOS, LVTTL	Tube	2,154 Pcs
49FCT3805AQG8	Renesas Electronics Corporation	50 MHz	0°C ~ 70°C	CMOS, LVTTL	CMOS, LVTTL	Cut Tape (CT)	2,400 Pcs
49FCT3805AQGI	Renesas Electronics Corporation	50 MHz	-40°C ~ 85°C	CMOS, LVTTL	CMOS, LVTTL	Tube	1,215 Pcs
49FCT3805AQGI8	Renesas Electronics Corporation	50 MHz	-40°C ~ 85°C	CMOS, LVTTL	CMOS, LVTTL	Tape & Reel (TR)	4,090 Pcs
49FCT3805DQGI	Renesas Electronics Corporation	166 MHz	-40°C ~ 85°C	CMOS, LVTTL	CMOS, LVTTL	Tube	1,675 Pcs
49FCT3805EQGI	Renesas Electronics Corporation	166 MHz	-40°C ~ 85°C	CMOS, LVTTL	CMOS, LVTTL	Tube	1,252 Pcs
49FCT3805QG	Renesas Electronics Corporation	50 MHz	0°C ~ 70°C	CMOS, LVTTL	CMOS, LVTTL	Tube	5,100 Pcs
49FCT3805QGI	Renesas Electronics Corporation	50 MHz	-40°C ~ 85°C	CMOS, LVTTL	CMOS, LVTTL	Tube	1,428 Pcs

Engineering Selection Recommendations

All listed substitute parts maintain active product status and full ROHS3 and REACH compliance, matching the regulatory requirements of the original PI49FCT3805QEX.

For applications requiring industrial temperature range (-40°C ~ 85°C): Select 49FCT3805AQGI, 49FCT3805AQGI8, 49FCT3805DQGI, 49FCT3805EQGI, or 49FCT3805QGI. The 49FCT3805AQGI8 is available in Tape & Reel format with 4,090 units in stock, matching the original packaging preference.

For applications with commercial temperature range (0°C ~ 70°C): Select 49FCT3805AQG, 49FCT3805AQG8, or 49FCT3805QG. The 49FCT3805QG offers the highest inventory (5,100 units) in Tube packaging.

For applications requiring higher frequency capability (166 MHz): Select 49FCT3805DQGI or 49FCT3805EQGI. These parts are backward compatible with 50 MHz designs and provide extended frequency margin.

For packaging format requirements: Tape & Reel (TR) options include 49FCT3805AQGI8 and the original PI49FCT3805QEX. Cut Tape (CT) is available as 49FCT3805AQG8. Tube packaging is available across all Renesas variants.

Frequently Asked Questions (FAQ)

Q: Can I substitute 49FCT3805AQG for PI49FCT3805QEX in an industrial temperature application?

A: No. The 49FCT3805AQG operates only across 0°C ~ 70°C (commercial range), while the PI49FCT3805QEX operates across -40°C ~ 85°C (industrial range). For industrial applications, select 49FCT3805AQGI, 49FCT3805AQGI8, 49FCT3805QGI, 49FCT3805DQGI, or 49FCT3805EQGI.

Q: Are the 49FCT3805DQGI and 49FCT3805EQGI suitable replacements for 50 MHz designs?

A: Yes. Both parts are rated for 166 MHz maximum frequency, which exceeds the 50 MHz requirement of the PI49FCT3805QEX. Higher frequency-rated parts are backward compatible with lower frequency applications.

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

A: These are delivery and packaging formats only. Tape & Reel (TR) is used for automated assembly lines. Cut Tape (CT) is pre-cut tape for manual or semi-automated handling. Tube packaging is for manual component selection. All three formats contain electrically identical parts and differ only in presentation and handling method.

Q: Can I use a Renesas 49FCT3805 variant to replace a Diodes Incorporated PI49FCT3805QEX?

A: Yes, provided the electrical parameters match. All Renesas 49FCT3805 variants listed maintain the same 1:5 ratio, 2-circuit configuration, 20-SSOP package, 3V ~ 3.6V supply voltage, and surface mount type. Verify that the operating temperature range and frequency rating meet your application requirements.

Q: What does LVTTL input/output support mean for compatibility?

A: LVTTL (Low Voltage TTL) is a subset of TTL logic levels. Parts supporting CMOS, LVTTL input/output are compatible with TTL and CMOS logic sources and loads. The original PI49FCT3805QEX supports CMOS and TTL input with CMOS output. Renesas variants supporting CMOS, LVTTL are fully compatible for these applications.

Q: Are all substitute parts ROHS3 and REACH compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the regulatory status of the original PI49FCT3805QEX.

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