74ACQ240PC Equivalent & Substitute Parts

Part Overview

The 74ACQ240PC is a Buffer, Inverting logic IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability. This 20-PDIP package device operates across a 2V to 6V supply voltage range and is rated for -40°C to 85°C operating temperature. The part is currently classified as obsolete, making equivalent substitutes necessary for ongoing system support and new designs requiring this functional specification.

Substiute Parts

74ACQ240PC

onsemiIn Stock: 95674ACQ240PC Datasheet

Current PartRFQ

SN74AC240N

Texas InstrumentsIn Stock: 2622SN74AC240N Datasheet

DirectRFQ

CD74AC240E

Harris CorporationIn Stock: 2264CD74AC240E Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACQ240PC is determined by the following critical parameters:

• Logic Type: Buffer, Inverting (must match exactly)
• Number of Elements: 2 (must match exactly)
• Number of Bits per Element: 4 (must match exactly)
• Output Type: 3-State (must match exactly)
• Current - Output High, Low: 24mA, 24mA (must match exactly)
• Package / Case: 20-DIP (0.300", 7.62mm) (must match exactly)
• Mounting Type: Through Hole (must match exactly)

Substitute parts must maintain identical functional specifications and physical form factor. Voltage supply range and operating temperature range may vary within industry-standard tolerances for the 74AC logic family, provided the substitute range encompasses or equals the original specification range.

Parameter Comparison

Engineering Selection Recommendations

SN74AC240N (Texas Instruments) is the primary substitute for 74ACQ240PC. This part maintains identical electrical specifications and physical packaging while offering active product status with current manufacturing support. The SN74AC240N is RoHS3 compliant, providing enhanced environmental and regulatory compliance compared to the obsolete original part.

CD74AC240E (Harris Corporation) is a secondary substitute option. While functionally equivalent in logic configuration, output characteristics, and package form factor, this part operates within a reduced voltage supply range (1.5V ~ 5.5V) compared to the original specification (2V ~ 6V). The CD74AC240E is obsolete and RoHS non-compliant, making it suitable only for legacy system maintenance where new stock availability is confirmed.

Frequently Asked Questions (FAQ)

Q: Can SN74AC240N directly replace 74ACQ240PC in existing designs?

A: Yes. The SN74AC240N maintains identical logic configuration, output drive capability (24mA), 3-state output functionality, and 20-PDIP package dimensions. Pin-for-pin compatibility is confirmed across all functional parameters.

Q: What is the voltage supply difference between CD74AC240E and the original 74ACQ240PC?

A: The CD74AC240E operates within 1.5V ~ 5.5V, while 74ACQ240PC operates within 2V ~ 6V. The CD74AC240E cannot be used in applications requiring supply voltages above 5.5V or below 2V.

Q: Why is 74ACQ240PC listed as obsolete?

A: The 74ACQ240PC is an obsolete onsemi product. Active alternatives from major manufacturers such as Texas Instruments (SN74AC240N) are available for new designs and ongoing production requirements.

Q: Are there compliance differences between substitute options?

A: SN74AC240N is RoHS3 compliant with active product status. CD74AC240E is RoHS non-compliant and obsolete. For new designs and regulated applications, SN74AC240N is the recommended selection.

Q: Is the 20-PDIP package identical across all three parts?

A: Yes. All three parts use the 20-DIP (0.300", 7.62mm) package with identical pin configuration and through-hole mounting specifications.