74ACTQ374SJ Equivalent & Substitute Parts

Part Overview

The 74ACTQ374SJ is a single-element D-type flip-flop logic integrated circuit with 8-bit positive edge triggering, manufactured by onsemi in a 20-SOIC package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The 74ACTQ374SJ operates with a supply voltage range of 4.5V to 5.5V and features tri-state, non-inverted outputs with 24mA output current capability. The device is suitable for applications requiring synchronous data storage and transfer in digital logic systems.

Key Parameters

Parameter	Value
Manufacturer Part Number	74ACTQ374SJ
Manufacturer	onsemi
Function	D-Type Flip-Flop
Number of Elements	1
Number of Bits per Element	8
Output Type	Tri-State, Non-Inverted
Trigger Type	Positive Edge
Clock Frequency	85 MHz
Max Propagation Delay @ 5V, 50pF	9 ns
Voltage - Supply	4.5V ~ 5.5V
Current - Output High, Low	24mA, 24mA
Current - Quiescent (Iq)	40 µA
Input Capacitance	4.5 pF
Operating Temperature	-40°C ~ 85°C
Package / Case	20-SOIC (0.209", 5.30mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74ACTQ374SJ is determined by the following critical parameters:

Functional Equivalence: All substitute parts must be single-element D-type flip-flops with 8-bit positive edge triggering, tri-state non-inverted outputs, and identical supply voltage range (4.5V ~ 5.5V).

Electrical Compatibility: Output current capability (24mA high and low) and output drive characteristics must match or exceed the original specification.

Package Compatibility: The 20-SOIC package footprint is the primary mechanical constraint. Substitutes may use equivalent 20-SOIC or 20-SSOP packages with compatible pin assignments.

Performance Parameters: Clock frequency, propagation delay, quiescent current, and input capacitance are secondary selection criteria. Substitutes with equal or superior performance characteristics are acceptable.

Compliance and Status: Product status (active, last time buy, or obsolete) and regulatory compliance (RoHS, REACH) are documented for procurement planning.

Parameter Comparison

Parameter	74ACTQ374SJ (Main)	CD74ACT374M	CD74ACT374M96	SN74ACT374DBR	SN74ACT374DW	SN74ACT374DWR	SN74ACT374NSR
Manufacturer	onsemi	Harris Corporation	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type
Number of Elements	1	1	1	1	1	1	1
Number of Bits per Element	8	8	8	8	8	8	8
Output Type	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted
Trigger Type	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge
Clock Frequency	85 MHz	110 MHz	110 MHz	160 MHz	160 MHz	160 MHz	160 MHz
Max Propagation Delay @ 5V, 50pF	9 ns	11.2 ns	11.2 ns	8.5 ns	8.5 ns	8.5 ns	10 ns
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	4.5V ~ 5.5V
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA
Current - Quiescent (Iq)	40 µA	8 µA	8 µA	4 µA	4 µA	4 µA	4 µA
Input Capacitance	4.5 pF	10 pF	10 pF	4.5 pF	4.5 pF	4.5 pF	4.5 pF
Operating Temperature	-40°C ~ 85°C	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	20-SOIC (0.209", 5.30mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)	20-SSOP (0.209", 5.30mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.209", 5.30mm)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Obsolete	Active	Active	Last Time Buy	Active	Active
RoHS Status	Not specified	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	Not specified	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Primary Substitutes (Active Product Status):

SN74ACT374DBR, SN74ACT374DWR, and SN74ACT374NSR are manufactured by Texas Instruments with active product status. These parts offer superior performance characteristics including higher clock frequency (160 MHz), lower propagation delay (8.5 ns to 10 ns), and reduced quiescent current (4 µA). All three are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements.

SN74ACT374DBR uses a 20-SSOP package (0.209", 5.30mm width) matching the original footprint dimensions. SN74ACT374DWR and SN74ACT374NSR use 20-SOIC packages with different body widths (0.295", 7.50mm and 0.209", 5.30mm respectively), requiring PCB layout verification for pin-to-pin compatibility.

Secondary Substitutes (Extended Temperature Range):

CD74ACT374M96 (Texas Instruments, active status) provides extended operating temperature range (-55°C to 125°C) with ROHS3 compliance. This part is suitable for applications requiring wider temperature operation. The 20-SOIC package (0.295", 7.50mm width) requires PCB layout assessment.

Legacy Substitutes (Obsolete Status):

CD74ACT374M (Harris Corporation, obsolete status) and SN74ACT374DW (Texas Instruments, last time buy status) are available but have limited procurement viability. CD74ACT374M is RoHS non-compliant. SN74ACT374DW is designated last time buy, indicating discontinued production.

Package Consideration:

The original 74ACTQ374SJ uses a 20-SOIC package with 0.209" body width. Substitutes with 0.295" body width require PCB layout verification to confirm pin spacing compatibility and clearance with adjacent components.

Frequently Asked Questions (FAQ)

Q: Can SN74ACT374DWR be used as a direct replacement for 74ACTQ374SJ?

A: SN74ACT374DWR is functionally equivalent with superior electrical performance. However, the package body width differs (0.295" versus 0.209"), requiring PCB layout verification. Pin assignments and electrical characteristics are compatible.

Q: What is the difference between SN74ACT374DBR and SN74ACT374DWR?

A: Both parts are manufactured by Texas Instruments with identical electrical specifications. SN74ACT374DBR uses a 20-SSOP package (0.209" width), while SN74ACT374DWR uses a 20-SOIC package (0.295" width). The SSOP variant matches the original footprint dimensions more closely.

Q: Is CD74ACT374M96 suitable for new designs?

A: Yes. CD74ACT374M96 has active product status, ROHS3 compliance, and REACH unaffected certification. The extended operating temperature range (-55°C to 125°C) provides additional design margin for temperature-sensitive applications.

Q: Why do some substitutes have lower quiescent current than the original part?

A: Quiescent current reduction reflects manufacturing process improvements in newer device generations. Lower Iq values reduce power consumption without affecting functional performance or output drive capability.

Q: Are all substitute parts pin-compatible with the original 74ACTQ374SJ?

A: All listed substitutes maintain identical pin assignments and functional pin definitions. Physical package dimensions vary, requiring PCB layout verification for mechanical fit and clearance.

Q: What is the significance of product status (Active, Last Time Buy, Obsolete)?

A: Active status indicates ongoing production and long-term availability. Last Time Buy indicates discontinued production with limited remaining inventory. Obsolete status indicates end-of-life with no production. For new designs, active status parts are recommended.

Q: Can CD74ACT374M be used despite RoHS non-compliance?

A: CD74ACT374M is functionally equivalent but does not meet current RoHS3 compliance requirements. Use is restricted to applications where RoHS compliance is not mandated. For new designs and regulated applications, ROHS3 compliant alternatives are required.

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