74ACTQ245QSCX Equivalent & Substitute Parts

Part Overview

The 74ACTQ245QSCX is a non-inverting transceiver logic integrated circuit manufactured by onsemi, designed for 8-bit bidirectional data transmission with 3-state output capability. This device operates within a 4.5V to 5.5V supply voltage range and is housed in a 20-QSOP surface mount package. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support, maintenance, and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	74ACTQ245QSCX
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-QSOP (0.154", 3.90mm Width)
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACTQ245QSCX is determined by the following critical parameters:

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
Mounting Type: Surface Mount
Base Product Number: 74ACT245

Substitute parts must maintain identical electrical specifications and functional characteristics. Package variations (QSOP, TSSOP, SSOP) are acceptable provided the pin configuration and electrical performance remain equivalent. All identified substitutes share the same base product number (74ACT245) and core functional parameters, ensuring direct functional compatibility.

Parameter Comparison

Parameter	74ACTQ245QSCX	MC74ACT245DTG	CD74ACT245SM96	SN74ACT245DBR	SN74ACT245PWR
Manufacturer	onsemi	onsemi	Texas Instruments	Texas Instruments	Texas Instruments
Logic Type	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting
Number of Elements	1	1	1	1	1
Number of Bits per Element	8	8	8	8	8
Output Type	3-State	3-State	3-State	3-State	3-State
Current - Output High, Low	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
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-55°C ~ 125°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	20-QSOP (0.154", 3.90mm Width)	20-TSSOP (0.173", 4.40mm Width)	20-SSOP (0.209", 5.30mm Width)	20-SSOP (0.209", 5.30mm Width)	20-TSSOP (0.173", 4.40mm Width)
Product Status	Obsolete	Obsolete	Active	Active	Active
RoHS Status	Not specified	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All identified substitute parts maintain electrical and functional equivalence to the 74ACTQ245QSCX. Selection among substitutes should prioritize product status and compliance certifications:

Active Status Substitutes (Recommended for New Designs):

CD74ACT245SM96 (Texas Instruments): Active product status with extended operating temperature range (-55°C ~ 125°C) and ROHS3 compliance. Available in 20-SSOP package.
SN74ACT245DBR (Texas Instruments): Active product status with ROHS3 compliance. Available in 20-SSOP package with highest current inventory (5400 Pcs).
SN74ACT245PWR (Texas Instruments): Active product status with ROHS3 compliance. Available in 20-TSSOP package with substantial inventory (3900 Pcs).

Obsolete Status Substitutes (Suitable for Maintenance/Replacement):

MC74ACT245DTG (onsemi): Obsolete status, functionally equivalent. Available in 20-TSSOP package with 1661 Pcs inventory.

Package selection depends on PCB layout constraints and available footprint space. All substitutes are electrically interchangeable within the specified parameters.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 74ACTQ245QSCX with any of the listed parts? A: Yes. All listed parts are functionally equivalent based on identical logic type, element count, bit width, output type, current ratings, and supply voltage specifications. Package differences (QSOP, TSSOP, SSOP) do not affect electrical compatibility but require PCB layout verification.

Q: What is the difference between the package types (QSOP, TSSOP, SSOP)? A: Package types differ in physical dimensions and pin pitch. QSOP (0.154" width) is the smallest, TSSOP (0.173" width) is intermediate, and SSOP (0.209" width) is the largest. All maintain identical pin configurations and electrical performance. PCB footprint compatibility must be verified before substitution.

Q: Why should I choose an active product over an obsolete substitute? A: Active products (CD74ACT245SM96, SN74ACT245DBR, SN74ACT245PWR) offer long-term availability, ongoing manufacturer support, and compliance certifications (ROHS3). Obsolete products may face supply constraints and limited future availability.

Q: Are there temperature rating differences between substitutes? A: CD74ACT245SM96 operates across -55°C ~ 125°C, providing extended temperature coverage compared to other substitutes rated -40°C ~ 85°C. Selection depends on application temperature requirements.

Q: Do all substitutes have the same moisture sensitivity level? A: Yes. All parts are classified as MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

Q: What inventory levels are available for each substitute? A: SN74ACT245DBR has the highest inventory (5400 Pcs), followed by SN74ACT245PWR (3900 Pcs), 74ACTQ245QSCX (3405 Pcs), MC74ACT245DTG (1661 Pcs), and CD74ACT245SM96 (743 Pcs).

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