PI74FCT3244QEX Equivalent & Substitute Parts

Part Overview

The PI74FCT3244QEX is a non-inverting buffer logic IC manufactured by Diodes Incorporated, designed for 3.3V CMOS applications. This device features 2 elements with 4 bits per element and 3-state output capability, housed in a 20-QSOP package. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Base Product Number	74FCT3244
Logic Type	Buffer, Non-Inverting
Number of Elements	2
Number of Bits per Element	4
Output Type	3-State
Voltage Supply Range	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Series	74FCT

Substitute Part Grouping Explanation

Substitution of the PI74FCT3244QEX is determined by strict adherence to the following electrical and mechanical parameters:

Core Electrical Parameters:

Logic type: Buffer, Non-Inverting
Number of elements: 2
Number of bits per element: 4
Output type: 3-State
Supply voltage range: 2.7V ~ 3.6V
Operating temperature range: -40°C ~ 85°C

Mechanical Parameters:

Mounting type: Surface Mount
Package family: 20-pin QSOP or 20-pin TSSOP or 20-pin SSOP variants

Substitute parts must maintain identical functional specifications and electrical characteristics. Package variations (QSOP, TSSOP, SSOP) are acceptable provided the pin count and pitch remain compatible with the application's PCB layout.

Parameter Comparison

Part Number	Manufacturer	Package Type	Logic Type	Elements / Bits	Output Type	Supply Voltage	Temp Range	Product Status	Current Output (High/Low)
PI74FCT3244QEX	Diodes Incorporated	20-QSOP	Buffer, Non-Inverting	2 / 4	3-State	2.7V ~ 3.6V	-40°C ~ 85°C	Obsolete	24mA / 24mA
74FCT3244APGG	IDT	20-TSSOP	Buffer, Non-Inverting	2 / 4	3-State	2.7V ~ 3.6V	-40°C ~ 85°C	Active	8mA / 24mA
74FCT3244APGG8	Renesas Electronics	20-TSSOP	Buffer, Non-Inverting	2 / 4	3-State	2.7V ~ 3.6V	-40°C ~ 85°C	Obsolete	8mA / 24mA
74FCT3244APYG	Renesas Electronics	20-SSOP	Buffer, Non-Inverting	2 / 4	3-State	2.7V ~ 3.6V	-40°C ~ 85°C	Obsolete	8mA / 24mA
74FCT3244AQG8	IDT	20-QSOP	Buffer, Non-Inverting	2 / 4	3-State	2.7V ~ 3.6V	-40°C ~ 85°C	Active	8mA / 24mA
74FCT3244QG	IDT	20-QSOP	Buffer, Non-Inverting	2 / 4	3-State	2.7V ~ 3.6V	-40°C ~ 85°C	Active	8mA / 24mA
74FCT3244QG8	Renesas Electronics	20-QSOP	Buffer, Non-Inverting	2 / 4	3-State	2.7V ~ 3.6V	-40°C ~ 85°C	Active	8mA / 24mA

Engineering Selection Recommendations

For Active Product Status Priority: Select 74FCT3244QG, 74FCT3244AQG8, or 74FCT3244QG8 for new designs and ongoing procurement. These parts maintain active product status with established supply chains and manufacturer support.

For Package Compatibility:

Same package (20-QSOP): 74FCT3244AQG8, 74FCT3244QG, 74FCT3244QG8
Alternative packages (20-TSSOP): 74FCT3244APGG, 74FCT3244APGG8
Alternative packages (20-SSOP): 74FCT3244APYG

For Compliance Requirements: All substitute parts listed maintain ROHS3 compliance and REACH unaffected status where specified. Verify specific compliance documentation with the selected manufacturer for your application requirements.

For Output Current Specifications: The original PI74FCT3244QEX specifies 24mA output current (both high and low). Substitute parts from IDT and Renesas specify 8mA high output current with 24mA low output current. Verify that reduced high-side output current meets your circuit's drive requirements before selection.

Frequently Asked Questions (FAQ)

Q: Can I use 74FCT3244APGG as a direct replacement for PI74FCT3244QEX? A: Functionally, yes. Both are non-inverting buffers with 2 elements, 4 bits per element, 3-state output, and identical supply voltage and temperature ranges. The primary difference is the package type (TSSOP vs. QSOP) and output current specification. PCB layout compatibility must be verified for the package change.

Q: What is the difference between 20-QSOP, 20-TSSOP, and 20-SSOP packages? A: These are different surface-mount package variants with different physical dimensions and pin pitches. QSOP (0.154" width), TSSOP (0.173" width), and SSOP (0.209" width) are not interchangeable on the same PCB without layout redesign. Select the package that matches your existing PCB footprint.

Q: Why do some substitute parts have lower output current (8mA vs. 24mA)? A: Output current specifications vary by manufacturer and product line within the 74FCT3244 family. Verify that your circuit's load requirements are satisfied by the 8mA high-side output current before substitution.

Q: Are all listed substitute parts RoHS compliant? A: RoHS3 compliance is specified for 74FCT3244APGG8, 74FCT3244APYG, and 74FCT3244QG8. Verify compliance documentation with IDT for 74FCT3244APGG, 74FCT3244AQG8, and 74FCT3244QG.

Q: Which substitute part has the best long-term availability? A: 74FCT3244QG and 74FCT3244AQG8 from IDT maintain active product status. 74FCT3244QG8 from Renesas also maintains active status. These three parts are recommended for designs requiring extended product lifecycle support.

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