74ACTQ374PC Equivalent & Substitute Parts

Part Overview

The 74ACTQ374PC is a single-element D-type flip-flop integrated circuit with 8-bit positive edge triggering, housed in a 20-DIP package. Manufactured by onsemi, this component is classified as obsolete. Due to its obsolete status and limited availability from the original manufacturer, identifying equivalent substitute parts is essential for system maintenance, legacy equipment repair, and design continuity.

Substiute Parts

74ACTQ374PC

onsemiIn Stock: 101874ACTQ374PC Datasheet

Current PartRFQ

CD74ACT374E

Harris CorporationIn Stock: 1825CD74ACT374E Datasheet

SimilarRFQ

SN74ACT374N

Texas InstrumentsIn Stock: 1130SN74ACT374N Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74ACTQ374PC are qualified based on the following critical parameters:

• Functional equivalence: D-Type flip-flop with 8-bit configuration and positive edge triggering
• Output characteristics: Tri-state, non-inverted output
• Package compatibility: 20-DIP (0.300", 7.62mm) through-hole mounting
• Electrical specifications: Supply voltage range 4.5V ~ 5.5V
• Operating temperature range: Minimum -40°C ~ 85°C

The identified substitute parts CD74ACT374E and SN74ACT374N meet all these core substitution criteria. Both components share the same base product number (74ACT374) and maintain functional and electrical compatibility with the original 74ACTQ374PC.

Parameter Comparison

Engineering Selection Recommendations

SN74ACT374N (Texas Instruments) is the preferred substitute for new designs and ongoing production. This part maintains active product status, ensuring continued availability and manufacturer support. It is RoHS3 compliant and REACH unaffected, meeting modern regulatory requirements. The SN74ACT374N demonstrates superior performance characteristics with 160 MHz clock frequency and lower quiescent current (4 µA), while maintaining full functional and electrical compatibility with the 74ACTQ374PC.

CD74ACT374E (Harris Corporation) is an alternative substitute suitable for legacy system maintenance and repair applications where the original 74ACTQ374PC is no longer available. This part shares identical functional specifications and package compatibility. However, it carries obsolete product status and is RoHS non-compliant, limiting its use to existing installations rather than new implementations.

Both substitute parts are pin-compatible and functionally equivalent for direct replacement in 20-DIP through-hole applications operating within the 4.5V ~ 5.5V supply range.

Frequently Asked Questions (FAQ)

Q: Can SN74ACT374N directly replace 74ACTQ374PC in existing circuits?

A: Yes. Both parts are functionally equivalent D-type flip-flops with 8-bit configuration, tri-state non-inverted outputs, and identical 20-DIP package specifications. Pin-to-pin compatibility is maintained, and electrical parameters are within acceptable substitution tolerances.

Q: What is the difference between the three parts in terms of performance?

A: The SN74ACT374N offers the highest clock frequency (160 MHz) and lowest quiescent current (4 µA). The CD74ACT374E provides intermediate performance (110 MHz, 8 µA Iq). The 74ACTQ374PC operates at 85 MHz with 40 µA quiescent current. All three maintain identical output drive capability (24mA) and supply voltage requirements (4.5V ~ 5.5V).

Q: Are there temperature range differences between substitutes?

A: The CD74ACT374E supports an extended operating temperature range of -55°C ~ 125°C, compared to -40°C ~ 85°C for both the 74ACTQ374PC and SN74ACT374N. For applications requiring extended temperature operation, the CD74ACT374E provides broader coverage.

Q: What is the significance of product status (Active vs. Obsolete)?

A: Active product status indicates ongoing manufacturer support, continued availability, and compliance with current regulatory standards. The SN74ACT374N maintains active status, ensuring long-term supply chain reliability. Obsolete parts (74ACTQ374PC and CD74ACT374E) have limited availability and may not receive future updates or support.

Q: Are there compliance differences between the substitute parts?

A: The SN74ACT374N is RoHS3 compliant and REACH unaffected, meeting modern environmental and regulatory requirements. The CD74ACT374E is RoHS non-compliant. All three parts are classified as EAR99 for export control purposes.

Q: Can these parts be used interchangeably in high-speed applications?

A: Yes, within their specified operating parameters. The SN74ACT374N, with 160 MHz clock frequency and 10ns propagation delay, is suitable for higher-speed applications. The 74ACTQ374PC and CD74ACT374E, with lower clock frequencies, are appropriate for standard-speed logic applications. Selection depends on system timing requirements.