74ACTQ245MSAX Equivalent & Substitute Parts

Part Overview

The 74ACTQ245MSAX is a non-inverting transceiver IC manufactured by onsemi, featuring 1 element with 8 bits per element and 3-state output capability. This component operates within a 4.5V to 5.5V supply voltage range and is housed in a 20-SSOP package. The part is currently classified as obsolete, making identification of equivalent and substitute components essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	74ACTQ245MSAX
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-SSOP (0.209", 5.30mm Width)
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74ACTQ245MSAX is determined by the following critical parameters:

Logic Function: Transceiver, Non-Inverting with 1 element and 8 bits per element
Output Configuration: 3-State output
Electrical Performance: 24mA output current (high and low), 4.5V to 5.5V supply voltage
Operating Temperature Range: Minimum -40°C to 85°C
Package Type: 20-pin surface mount package
Mounting Technology: Surface mount compatibility

Substitute parts must maintain identical logic functionality, output drive capability, and supply voltage specifications. Package variations (SSOP vs. TSSOP) are permissible when footprint compatibility is confirmed. Parts with extended temperature ranges or active product status provide additional design flexibility.

Parameter Comparison

Parameter	74ACTQ245MSAX (onsemi)	CD74ACT245SM96 (TI)	SN74ACT245PWR (TI)	SN74ACT245DBR (TI)
Logic Type	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting
Number of Elements	1	1	1	1
Number of Bits per Element	8	8	8	8
Output Type	3-State	3-State	3-State	3-State
Current - Output High, Low	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
Operating Temperature	-40°C ~ 85°C	-55°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	20-SSOP	20-SSOP	20-TSSOP	20-SSOP
Product Status	Obsolete	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Direct Package Match (20-SSOP):

SN74ACT245DBR (Texas Instruments): Identical package footprint, matching operating temperature range, active product status, and ROHS3 compliance. This part provides the most direct replacement with no PCB layout modifications required.
CD74ACT245SM96 (Texas Instruments): Identical package footprint and electrical specifications. Extended operating temperature range (-55°C to 125°C) offers enhanced thermal margin. Active product status and ROHS3 compliance support long-term availability.

Alternative Package (20-TSSOP):

SN74ACT245PWR (Texas Instruments): Functionally equivalent with identical electrical performance. Package footprint differs (20-TSSOP vs. 20-SSOP), requiring PCB layout verification. Active product status and ROHS3 compliance ensure supply continuity. Higher inventory availability (3900 pcs) supports production requirements.

All substitute parts maintain the core 74ACT245 base product number, ensuring functional compatibility with the original 74ACTQ245MSAX design. Selection should prioritize package compatibility with existing PCB layouts and supply chain availability.

Frequently Asked Questions (FAQ)

Q: Can SN74ACT245PWR replace 74ACTQ245MSAX directly on the PCB? A: SN74ACT245PWR uses a 20-TSSOP package versus the original 20-SSOP package. While electrically equivalent, the different package footprint requires PCB layout verification before substitution. Direct pin-for-pin replacement is not possible without layout modification.

Q: What is the difference between CD74ACT245SM96 and SN74ACT245DBR? A: Both parts are functionally and electrically identical with matching 20-SSOP packages. CD74ACT245SM96 offers an extended operating temperature range (-55°C to 125°C) compared to SN74ACT245DBR (-40°C to 85°C). Selection depends on thermal environment requirements.

Q: Why is the 74ACTQ245MSAX listed as obsolete? A: The 74ACTQ245MSAX is an onsemi product that has reached end-of-life status. Texas Instruments maintains active production of equivalent 74ACT245 variants, providing long-term design support and supply continuity.

Q: Are all substitute parts RoHS compliant? A: Yes. All Texas Instruments substitute parts (CD74ACT245SM96, SN74ACT245PWR, SN74ACT245DBR) are ROHS3 compliant, meeting environmental and regulatory requirements for modern electronics manufacturing.

Q: What is the moisture sensitivity level for these parts? A: All parts, including the original 74ACTQ245MSAX and all substitutes, have MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions during storage or handling.

Q: Can I use these parts interchangeably in my design? A: Electrical interchangeability is confirmed for all listed substitutes. Package compatibility must be verified: SN74ACT245DBR and CD74ACT245SM96 match the original 20-SSOP footprint; SN74ACT245PWR requires layout verification due to its 20-TSSOP package.

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