74AC245PC Equivalent & Substitute Parts

Part Overview

The 74AC245PC is an octal bus transceiver with non-inverting logic, featuring 3-state output capability. Manufactured by onsemi, this component operates across a 2V to 6V supply voltage range and is rated for -40°C to 85°C operating temperature. The part is classified as obsolete, making identification of equivalent and substitute components essential for ongoing system support and procurement planning.

Substiute Parts

74AC245PC

onsemiIn Stock: 1394274AC245PC Datasheet

Current PartRFQ

SN74AC245N

Texas InstrumentsIn Stock: 1083SN74AC245N Datasheet

DirectRFQ

CD74AC245E

Harris CorporationIn Stock: 11535CD74AC245E Datasheet

SimilarRFQ

SN74AC245NE4

Texas InstrumentsIn Stock: 653SN74AC245NE4 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74AC245PC is determined by strict equivalence across the following critical parameters: logic type (non-inverting transceiver), element and bit configuration (1 element, 8 bits per element), output type (3-state), output current capability (24mA high and low), supply voltage range (2V to 6V minimum), operating temperature range (-40°C to 85°C minimum), package type (20-DIP), and mounting method (through hole).

The substitute parts are grouped into two categories:

Direct Manufacturer Equivalents: Parts meeting all electrical and mechanical specifications with identical or superior performance characteristics and active product status.

Similar Manufacturer Parts: Components meeting core functional and electrical specifications but with variations in supply voltage range, operating temperature, or product status that may affect suitability depending on application requirements.

Parameter Comparison

Engineering Selection Recommendations

SN74AC245N (Texas Instruments) and SN74AC245NE4 (Texas Instruments) are the primary substitutes for the 74AC245PC. Both parts are active products with ROHS3 compliance, matching all critical electrical parameters and operating specifications. These components provide long-term availability and regulatory compliance advantages over the obsolete original part.

CD74AC245E (Harris Corporation) meets all core functional and electrical specifications but operates across a narrower supply voltage range (1.5V to 5.5V versus 2V to 6V) and an extended temperature range (-55°C to 125°C). This part is obsolete and RoHS non-compliant, making it suitable only for legacy system maintenance where supply voltage and temperature specifications align with application requirements.

Selection should prioritize active, compliant parts (SN74AC245N or SN74AC245NE4) for new designs and ongoing procurement. The CD74AC245E may be considered only when legacy system constraints require its specific voltage or temperature characteristics.

Frequently Asked Questions (FAQ)

Q: Can SN74AC245N directly replace 74AC245PC in existing designs?

A: Yes. The SN74AC245N meets all electrical and mechanical specifications of the 74AC245PC, including supply voltage range (2V to 6V), output current (24mA), operating temperature (-40°C to 85°C), and 20-DIP package configuration. The part is pin-compatible and functionally equivalent.

Q: What is the difference between SN74AC245N and SN74AC245NE4?

A: Both parts are functionally and electrically identical. The designation difference reflects packaging or distribution variants. Both are active products with ROHS3 compliance and identical electrical specifications.

Q: Why is CD74AC245E listed as a substitute if it has different voltage and temperature ranges?

A: CD74AC245E meets the core functional requirements (non-inverting transceiver, 8-bit, 3-state output, 24mA drive capability, 20-DIP package). However, its supply voltage range (1.5V to 5.5V) is narrower than the original specification (2V to 6V). It is listed as a similar part for applications where the narrower voltage range is acceptable and the extended temperature range (-55°C to 125°C) provides additional margin.

Q: Are there any compliance or regulatory differences between substitute parts?

A: SN74AC245N and SN74AC245NE4 are ROHS3 compliant active products. CD74AC245E is RoHS non-compliant and obsolete. For new designs or systems requiring regulatory compliance, SN74AC245N or SN74AC245NE4 are the appropriate selections.

Q: Is the 20-DIP package still available for new designs?

A: The 20-DIP through-hole package remains available through active product lines (SN74AC245N and SN74AC245NE4). However, for new designs, evaluation of surface-mount alternatives in the 74AC245 series may be warranted for manufacturing efficiency and space optimization.