PI74LPT244AS Equivalent & Substitute Parts

Part Overview

The PI74LPT244AS is a non-inverting buffer logic IC manufactured by Diodes Incorporated, featuring 2 elements with 4 bits per element and 3-state output capability in a 20-SOIC package. This device operates at 2.7V to 3.6V supply voltage with 24mA output current capability. The part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. Substitute parts must maintain functional equivalence in buffer operation, pin configuration, and electrical performance within the 20-SOIC form factor.

Key Parameters

Parameter	PI74LPT244AS
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)
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the PI74LPT244AS is determined by strict equivalence in the following parameters:

Logic Type: Buffer, Non-Inverting (2 elements, 4 bits per element)
Output Type: 3-State
Package: 20-SOIC form factor
Output Current: Minimum 24mA (high and low)
Supply Voltage Range: Must encompass or exceed 2.7V ~ 3.6V
Operating Temperature: Must support -40°C minimum and 85°C maximum

Substitute parts are grouped into two categories based on supply voltage compatibility:

Category A (Voltage Range 2V ~ 3.6V): Parts with restricted upper voltage limit suitable for 3.3V logic systems.

Category B (Voltage Range 2V ~ 5.5V): Parts with extended voltage range supporting both 3.3V and 5V logic systems.

All substitute parts maintain the 20-SOIC package, 2-element 4-bit buffer configuration, and 3-state output architecture required for direct functional replacement.

Parameter Comparison

Parameter	PI74LPT244AS	74LCX244WM	74LCX244WMX	74LVC2244AD,118	CLVC244AQDWRG4Q1	MC74LCX244DWG	MC74LCX244DWR2G	SN74LVC2244ADW	SN74LVC2244ADWR	SN74LVC244ADW	SN74LVC244ADWE4
Manufacturer	Diodes Inc.	onsemi	Fairchild	NXP USA Inc.	Texas Instruments	onsemi	onsemi	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Logic Type	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting
Number of Elements	2	2	2	2	2	2	2	2	2	2	2
Number of Bits per Element	4	4	4	4	4	4	4	4	4	4	4
Output Type	3-State	3-State	3-State	3-State	3-State	3-State	3-State	3-State	3-State	3-State	3-State
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA	12mA, 12mA	24mA, 24mA	24mA, 24mA	24mA, 24mA	12mA, 12mA	12mA, 12mA	24mA, 24mA	24mA, 24mA
Voltage - Supply	2.7V ~ 3.6V	2V ~ 3.6V	2V ~ 3.6V	1.2V ~ 3.6V	1.65V ~ 3.6V	2V ~ 5.5V	2V ~ 5.5V	1.65V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Discontinued at DiGi Electronics
RoHS Status	Non-compliant	ROHS3 Compliant	Not specified	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For 3.3V Logic Systems (Restricted Voltage Range):

74LCX244WM (onsemi) and 74LCX244WMX (Fairchild Semiconductor) are suitable for applications limited to 2V ~ 3.6V operation. Both maintain 24mA output current and active product status. The 74LCX244WM offers higher inventory availability (1697 pcs) with ROHS3 compliance and standard MSL rating.

SN74LVC2244ADW and SN74LVC2244ADWR (Texas Instruments) provide 12mA output current with extended supply range (1.65V ~ 3.6V) and ROHS3 compliance. These are suitable where lower output current meets system requirements.

For Extended Voltage Range (2V ~ 5.5V):

MC74LCX244DWG and MC74LCX244DWR2G (onsemi) support operation across 2V ~ 5.5V with 24mA output current, enabling compatibility with both 3.3V and 5V logic systems. Both maintain active product status and ROHS3 compliance with extended operating temperature range (-55°C ~ 125°C).

For Automotive Applications:

CLVC244AQDWRG4Q1 (Texas Instruments) is qualified to AEC-Q100 automotive standard with 24mA output current, 1.65V ~ 3.6V supply range, and -40°C ~ 125°C operating temperature. This part carries ROHS3 compliance and unlimited MSL rating.

For Maximum Output Current Matching:

SN74LVC244ADW (Texas Instruments) and SN74LVC244ADWE4 (Texas Instruments) both provide 24mA output current matching the original PI74LPT244AS specification, with extended temperature range support (-40°C ~ 125°C) and ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with lower output current (12mA vs 24mA)?

A: Substitution with lower output current is application-dependent. The 74LVC2244AD,118 and SN74LVC2244ADW/ADWR provide 12mA output current. Use these only if your circuit design confirms that 12mA meets the load requirements. Higher current capability provides design margin but is not required if loads are verified at lower current levels.

Q: What is the difference between 74LCX244 and 74LVC244 series?

A: Both are non-inverting buffer ICs in 20-SOIC packages with identical pin configurations. The 74LCX series (onsemi) operates at 2V ~ 3.6V or 2V ~ 5.5V depending on variant. The 74LVC series (Texas Instruments, NXP) operates at lower minimum voltage (1.2V ~ 1.65V) with extended upper range. Selection depends on your system voltage requirements and output current needs.

Q: Are all substitute parts RoHS compliant?

A: Most active substitute parts listed are ROHS3 compliant. The original PI74LPT244AS is RoHS non-compliant. If RoHS compliance is required for your application, select from the ROHS3 compliant alternatives: 74LCX244WM, CLVC244AQDWRG4Q1, MC74LCX244DWG, MC74LCX244DWR2G, SN74LVC2244ADW, SN74LVC2244ADWR, SN74LVC244ADW, or SN74LVC244ADWE4.

Q: Which substitute offers the best long-term availability?

A: SN74LVC2244ADWR (Texas Instruments) and SN74LVC244ADW (Texas Instruments) show high inventory levels (2000 pcs and 2933 pcs respectively) with active product status. MC74LCX244DWR2G (onsemi) also maintains active status with 1597 pcs in stock. Texas Instruments and onsemi are established manufacturers with strong long-term support for logic IC families.

Q: Can I substitute the PI74LPT244AS in a 5V system?

A: The original PI74LPT244AS is rated for 2.7V ~ 3.6V and is not suitable for 5V systems. For 5V operation, use MC74LCX244DWG or MC74LCX244DWR2G (onsemi), both rated 2V ~ 5.5V with 24mA output current and active product status.

Q: What is the MSL (Moisture Sensitivity Level) consideration?

A: The original PI74LPT244AS has MSL 1 (unlimited moisture exposure). Most substitutes maintain MSL 1 (74LCX244WM, CLVC244AQDWRG4Q1, SN74LVC2244ADW, SN74LVC2244ADWR, SN74LVC244ADW, SN74LVC244ADWE4) or MSL 3 (74LCX244WMX, MC74LCX244DWG, MC74LCX244DWR2G). MSL 3 requires controlled storage and handling (168-hour floor life after moisture exposure). Select MSL 1 parts for applications with extended shelf storage or less stringent moisture control.

Q: Are the pin configurations identical across all substitutes?

A: Yes. All substitute parts maintain the 20-SOIC package with identical pin configuration as the PI74LPT244AS. The 2-element, 4-bit non-inverting buffer architecture with 3-state output is preserved across all listed alternatives, enabling direct PCB replacement without layout modification.

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