74ACTQ244QSCX Equivalent & Substitute Parts

Part Overview

The 74ACTQ244QSCX is a non-inverting buffer logic IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability. This device is rated for 4.5V to 5.5V supply voltage operation across the -40°C to 85°C temperature range. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	74ACTQ244QSCX
Manufacturer	onsemi
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	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	20-LSSOP (0.154", 3.90mm Width)
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74ACTQ244QSCX is determined by strict equivalence across the following critical parameters:

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: 4.5V ~ 5.5V
Operating Temperature: -40°C ~ 85°C (TA)
Mounting Type: Surface Mount

Substitute parts maintain identical electrical specifications and functional behavior. Package variations (20-QSOP, 20-SSOP, 20-TSSOP) represent different physical form factors of the same logic device and are interchangeable at the functional level, provided PCB layout accommodates the specific package dimensions.

Parameter Comparison

Parameter	74ACTQ244QSCX (onsemi)	CD74ACT244SM96 (TI)	SN74ACT244DBR (TI)	SN74ACT244PW (TI)	SN74ACT244PWE4 (TI)	SN74ACT244PWR (TI)
Logic Type	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
Number of Bits per Element	4	4	4	4	4	4
Output Type	3-State	3-State	3-State	3-State	3-State	3-State
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	20-LSSOP (0.154", 3.90mm Width)	20-SSOP (0.209", 5.30mm Width)	20-SSOP (0.209", 5.30mm Width)	20-TSSOP (0.173", 4.40mm Width)	20-TSSOP (0.173", 4.40mm Width)	20-TSSOP (0.173", 4.40mm Width)
Product Status	Obsolete	Discontinued at DiGi Electronics	Active	Discontinued at DiGi Electronics	Discontinued at DiGi Electronics	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For replacement of the obsolete 74ACTQ244QSCX, the following Texas Instruments alternatives are available:

SN74ACT244PWR is the primary recommendation. This part maintains active product status, carries ROHS3 compliance certification, and is available in high inventory (45,400 units). The 20-TSSOP package requires PCB layout modification compared to the original 20-LSSOP form factor.

SN74ACT244DBR provides an alternative with active product status and ROHS3 compliance. This part uses the 20-SSOP package, which differs in width (5.30mm versus the original 3.90mm), requiring PCB redesign consideration.

CD74ACT244SM96 and SN74ACT244PW are available but carry discontinued status at DiGi Electronics, limiting long-term supply reliability.

All substitute parts maintain identical electrical specifications and functional equivalence to the original 74ACTQ244QSCX across the specified operating range.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 74ACTQ244QSCX with SN74ACT244PWR without circuit modification?

A: Electrical substitution is direct. The SN74ACT244PWR maintains identical logic function, output drive capability (24mA), supply voltage range (4.5V–5.5V), and operating temperature range (-40°C to 85°C). However, the package differs: SN74ACT244PWR uses 20-TSSOP (4.40mm width) versus the original 20-LSSOP (3.90mm width). PCB footprint modification is required.

Q: What is the difference between 20-LSSOP, 20-SSOP, and 20-TSSOP packages?

A: These are surface-mount package variants of the same logic device. The primary difference is package width: 20-LSSOP measures 3.90mm, 20-SSOP measures 5.30mm, and 20-TSSOP measures 4.40mm. Pin pitch and electrical function remain identical. Package selection depends on available PCB real estate and layout constraints.

Q: Are all substitute parts RoHS compliant?

A: All Texas Instruments substitutes (CD74ACT244SM96, SN74ACT244DBR, SN74ACT244PW, SN74ACT244PWE4, SN74ACT244PWR) carry ROHS3 compliance certification. The original onsemi 74ACTQ244QSCX does not specify RoHS status in the provided data.

Q: Which substitute part has the best availability?

A: SN74ACT244PWR offers the highest inventory level at 45,400 units and maintains active product status, ensuring long-term supply continuity.

Q: Can I use CD74ACT244SM96 or SN74ACT244PW for new designs?

A: Both parts are functionally equivalent but carry discontinued status at DiGi Electronics. For new designs requiring long-term support, SN74ACT244PWR or SN74ACT244DBR are preferred due to active product status.

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