74ACTQ245SJ Equivalent & Substitute Parts

Part Overview

The 74ACTQ245SJ is a non-inverting transceiver IC manufactured by onsemi, designed for 8-bit data bus switching applications with 3-state output capability. This component operates across a 4.5V to 5.5V supply range and is rated for -40°C to 85°C operating temperature. 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	74ACTQ245SJ
Manufacturer	onsemi
Logic Type	Transceiver, Non-Inverting
Number of Elements	1
Number of Bits per Element	8
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-SOIC (0.209", 5.30mm Width)
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACTQ245SJ is determined by the following critical parameters:

Logic Type: Transceiver, Non-Inverting (must match exactly)
Number of Elements: 1 (must match exactly)
Number of Bits per Element: 8 (must match exactly)
Output Type: 3-State (must match exactly)
Current - Output High, Low: 24mA, 24mA (must match exactly)
Voltage - Supply: 4.5V ~ 5.5V (must match exactly)
Mounting Type: Surface Mount (must match exactly)
Moisture Sensitivity Level: 1 (Unlimited) (must match exactly)

All identified substitute parts meet these core electrical and mechanical requirements. Package variations (20-SOIC with different widths or 20-SO) are acceptable substitutes provided the pin configuration and electrical specifications remain identical.

Parameter Comparison

Parameter	74ACTQ245SJ (onsemi)	CD74ACT245M96 (TI)	SN74ACT245DW (TI)	SN74ACT245DWR (TI)	SN74ACT245NSR (TI)	SN74ACT245NS (TI)
Logic Type	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting
Number of Elements	1	1	1	1	1	1
Number of Bits per Element	8	8	8	8	8	8
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)	-55°C ~ 125°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-SOIC (0.209", 5.30mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.209", 5.30mm Width)	20-SOIC (0.209", 5.30mm Width)
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Discontinued at DiGi Electronics	Active	Active	Discontinued at DiGi Electronics
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For applications currently using the 74ACTQ245SJ, the following Texas Instruments alternatives provide direct functional equivalence:

Primary Recommendations (Active Product Status):

CD74ACT245M96: Active status with extended operating temperature range (-55°C to 125°C). Package width differs (7.50mm vs. 5.30mm); PCB layout verification required.
SN74ACT245DWR: Active status with matching operating temperature range (-40°C to 85°C). Package width differs (7.50mm vs. 5.30mm); PCB layout verification required.
SN74ACT245NSR: Active status with matching operating temperature range (-40°C to 85°C). Package width matches original (5.30mm); direct footprint compatibility.

Secondary Alternatives (Discontinued Status):

SN74ACT245DW: Discontinued at DiGi Electronics; available inventory may be limited.
SN74ACT245NS: Discontinued at DiGi Electronics; available inventory may be limited.

All substitute parts carry ROHS3 compliance and REACH unaffected status, meeting modern regulatory requirements. Selection should prioritize active product status for long-term supply assurance.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a different package width?

A: Package width differences (0.209" vs. 0.295") affect PCB footprint compatibility. Substitutes with 7.50mm width (CD74ACT245M96, SN74ACT245DW, SN74ACT245DWR) require PCB layout verification. SN74ACT245NSR maintains the original 5.30mm width for direct footprint compatibility.

Q: What is the significance of the operating temperature range difference?

A: CD74ACT245M96 offers an extended operating temperature range (-55°C to 125°C) compared to the original specification (-40°C to 85°C). This provides additional thermal margin but does not affect compatibility in applications within the original temperature range.

Q: Are all substitute parts RoHS compliant?

A: All identified Texas Instruments substitutes are ROHS3 compliant. The original 74ACTQ245SJ RoHS status was not specified in available documentation.

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

A: SN74ACT245DWR and SN74ACT245NSR maintain active product status at Texas Instruments, providing the most reliable long-term supply assurance. CD74ACT245M96 is also active but with package width variation.

Q: Can I directly replace the 74ACTQ245SJ with SN74ACT245NSR?

A: Yes. SN74ACT245NSR matches all critical electrical parameters and maintains the original 20-SOIC (0.209", 5.30mm Width) package, enabling direct footprint and functional replacement.

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