74ACT240PC Equivalent & Substitute Parts

Part Overview

The 74ACT240PC is a Buffer, Inverting logic integrated circuit manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability. This device is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance, repairs, and legacy design support. The 20-PDIP package and 5.5V supply voltage specification define the core electrical and mechanical compatibility requirements for direct substitution.

Substiute Parts

74ACT240PC

onsemiIn Stock: 325474ACT240PC Datasheet

Current PartRFQ

CD74ACT240E

Harris CorporationIn Stock: 4030CD74ACT240E Datasheet

Parametric EquivalentRFQ

SN74ACT240N

Texas InstrumentsIn Stock: 66079SN74ACT240N Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74ACT240PC are qualified based on strict parametric equivalence across the following critical criteria:

• Logic function: Buffer, Inverting configuration with identical element and bit-per-element count
• Electrical performance: Matching output current ratings (24mA high and low), supply voltage range (4.5V ~ 5.5V), and operating temperature range (-40°C ~ 85°C)
• Package compatibility: 20-DIP form factor with 0.300" (7.62mm) pitch for direct pin-for-pin substitution
• Series alignment: 74ACT logic family designation

All identified substitutes meet these parameters without exception. Substitution is determined solely by parametric matching; no functional testing or design verification is required beyond confirming these electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

SN74ACT240N (Texas Instruments) is the primary substitute for new procurement and system maintenance. This part maintains full parametric equivalence with the 74ACT240PC while offering active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment for applications requiring RoHS certification.

CD74ACT240E (Harris Corporation) provides an alternative substitute with identical electrical and mechanical specifications. This part is classified as obsolete, matching the status of the original 74ACT240PC. Selection of this substitute should be limited to applications where existing inventory must be maintained or where specific procurement constraints exist.

Both substitutes are pin-for-pin compatible and require no circuit modifications for direct replacement in 20-DIP through-hole applications operating within the specified voltage and temperature ranges.

Frequently Asked Questions (FAQ)

Q: Can SN74ACT240N replace 74ACT240PC in existing designs? A: Yes. Both parts are parametrically equivalent across all critical specifications: logic function, output current, supply voltage, operating temperature, and 20-DIP package. Direct substitution is possible without circuit modification.

Q: What is the difference between CD74ACT240E and SN74ACT240N? A: Both are parametric equivalents to the 74ACT240PC. The primary difference is product status: SN74ACT240N is active with ROHS3 compliance, while CD74ACT240E is obsolete. For new designs and long-term availability, SN74ACT240N is preferred.

Q: Are there any package variations among these substitutes? A: No. All three parts use the identical 20-DIP (0.300", 7.62mm) package with through-hole mounting. Pin count, pitch, and physical dimensions are identical, enabling direct board-level substitution.

Q: What electrical parameters must match for substitution? A: Supply voltage range (4.5V ~ 5.5V), output current capability (24mA high and low), and operating temperature range (-40°C ~ 85°C) must be identical. All listed substitutes meet these requirements.

Q: Is the 74ACT logic family still in production? A: The 74ACT series remains in limited production through select manufacturers. SN74ACT240N from Texas Instruments maintains active status, while onsemi's 74ACT240PC and Harris's CD74ACT240E are obsolete. For new applications, active alternatives are recommended.