PI74FCT3244LE Equivalent & Substitute Parts

Part Overview

The PI74FCT3244LE is a non-inverting buffer logic IC manufactured by Diodes Incorporated, designed for 3-state output applications in the 74FCT series. This component features 2 elements with 4 bits per element, operating across a supply voltage range of 2.7V to 3.6V. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	PI74FCT3244LE
Manufacturer	Diodes Incorporated
Series	74FCT
Logic Type	Buffer, Non-Inverting
Number of Elements	2
Number of Bits per Element	4
Output Type	3-State
Current - Output High, Low	24mA, 24mA
Voltage - Supply	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	20-TSSOP (0.173", 4.40mm Width)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the PI74FCT3244LE is determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Parameters:

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

Package Compatibility: Substitutes are grouped by package type. The original PI74FCT3244LE uses 20-TSSOP packaging. Substitutes in identical 20-TSSOP packaging provide direct mechanical and electrical compatibility. Substitutes in alternative packages (20-SSOP, 20-QSOP) maintain electrical equivalence but require PCB layout modification.

Output Current Consideration: The PI74FCT3244LE specifies 24mA output current (both high and low). Substitute parts from IDT and Renesas specify 8mA high output current with 24mA low output current. This difference in high-side output current must be evaluated against circuit requirements.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements / Bits	Output Type	Current High/Low (mA)	Voltage Supply	Temp Range	Package	Status
PI74FCT3244LE	Diodes Incorporated	Buffer, Non-Inverting	2 / 4	3-State	24 / 24	2.7V ~ 3.6V	-40°C ~ 85°C	20-TSSOP	Obsolete
74FCT3244APGG	IDT	Buffer, Non-Inverting	2 / 4	3-State	8 / 24	2.7V ~ 3.6V	-40°C ~ 85°C	20-TSSOP	Active
74FCT3244APGG8	Renesas Electronics	Buffer, Non-Inverting	2 / 4	3-State	8 / 24	2.7V ~ 3.6V	-40°C ~ 85°C	20-TSSOP	Obsolete
74FCT3244APYG	Renesas Electronics	Buffer, Non-Inverting	2 / 4	3-State	8 / 24	2.7V ~ 3.6V	-40°C ~ 85°C	20-SSOP	Obsolete
74FCT3244AQG8	IDT	Buffer, Non-Inverting	2 / 4	3-State	8 / 24	2.7V ~ 3.6V	-40°C ~ 85°C	20-QSOP	Active
74FCT3244QG	IDT	Buffer, Non-Inverting	2 / 4	3-State	8 / 24	2.7V ~ 3.6V	-40°C ~ 85°C	20-QSOP	Active
74FCT3244QG8	Renesas Electronics	Buffer, Non-Inverting	2 / 4	3-State	8 / 24	2.7V ~ 3.6V	-40°C ~ 85°C	20-QSOP	Active

Engineering Selection Recommendations

For Direct Replacement (20-TSSOP Package): The 74FCT3244APGG (IDT, Active status) provides the most current-available substitute with identical 20-TSSOP packaging. This part maintains mechanical compatibility with existing PCB designs. The reduced high-side output current (8mA vs. 24mA) must be verified against circuit load requirements.

For Active Product Status Priority: If procurement of an active product is required, 74FCT3244QG (IDT, 20-QSOP) or 74FCT3244AQG8 (IDT, 20-QSOP) are available with active product status. These require PCB layout modification due to package change from TSSOP to QSOP.

For RoHS3 Compliance: All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, consistent with the original PI74FCT3244LE specifications.

Frequently Asked Questions (FAQ)

Q: Can 74FCT3244APGG directly replace PI74FCT3244LE on the PCB? A: Yes, mechanically and electrically. Both use 20-TSSOP packaging and share identical pin configurations. The output current difference (8mA high vs. 24mA high) must be evaluated for your specific load impedance.

Q: What is the difference between 20-TSSOP, 20-SSOP, and 20-QSOP packages? A: These are different surface-mount package types with different physical dimensions and pin spacing. 20-TSSOP (0.173" width) and 20-SSOP (0.209" width) are not interchangeable on the same PCB footprint. 20-QSOP (0.154" width) requires a different footprint. Package selection depends on available PCB real estate and manufacturing capabilities.

Q: Why do substitute parts show lower high-side output current (8mA vs. 24mA)? A: This reflects manufacturer specifications for different product lines within the 74FCT3244 family. Circuit compatibility depends on load requirements. If your application requires 24mA high-side output, verify that substitute parts meet this requirement before selection.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, matching the original part's environmental compliance profile.

Q: Which substitute has the best availability? A: 74FCT3244QG (IDT) shows the highest inventory level at 24,273 pieces. This part is active status and ROHS3 compliant, though it requires PCB layout modification due to 20-QSOP packaging.

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