74AC245SJ Equivalent & Substitute Parts

Part Overview

The 74AC245SJ is a non-inverting transceiver logic IC manufactured by onsemi, featuring 1 element with 8 bits per element and 3-state output capability. This component operates across a 2V to 6V supply voltage range and is housed in a 20-SOP package. The part is currently listed as obsolete, making equivalent substitutes necessary for ongoing design requirements and production continuity.

Substiute Parts

74AC245SJ

onsemiIn Stock: 114274AC245SJ Datasheet

Current PartRFQ

SN74AC245NSR

Texas InstrumentsIn Stock: 7303SN74AC245NSR Datasheet

DirectRFQ

CD74AC245M

Harris CorporationIn Stock: 2009CD74AC245M Datasheet

SimilarRFQ

CD74AC245M96

Texas InstrumentsIn Stock: 5308CD74AC245M96 Datasheet

SimilarRFQ

SN74AC245DW

Texas InstrumentsIn Stock: 2384SN74AC245DW Datasheet

SimilarRFQ

SN74AC245DWR

Texas InstrumentsIn Stock: 3285SN74AC245DWR Datasheet

SimilarRFQ

SN74AC245IDWREP

Texas InstrumentsIn Stock: 841SN74AC245IDWREP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74AC245SJ is determined by the following critical parameters:

• Logic Type: Transceiver, Non-Inverting
• Number of Elements: 1
• Number of Bits per Element: 8
• Output Type: 3-State
• Current - Output High, Low: 24mA, 24mA
• Voltage - Supply: 2V ~ 6V
• Operating Temperature: -40°C ~ 85°C (TA)
• Mounting Type: Surface Mount
• Base Product Number: 74AC245

Substitutes are grouped into two categories based on electrical compatibility:

Direct Substitutes (Identical Electrical Specifications): Parts maintaining the exact 2V ~ 6V supply voltage range and -40°C ~ 85°C operating temperature.

Similar Substitutes (Extended Operating Range): Parts with expanded voltage supply (1.5V ~ 5.5V) and extended operating temperature range (-55°C ~ 125°C), which remain functionally compatible but offer broader environmental specifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation - Direct Electrical Equivalents:

SN74AC245NSR (Texas Instruments) is the preferred direct substitute. This part maintains identical electrical specifications (2V ~ 6V supply, -40°C ~ 85°C operating range) and is currently in active production status. The 20-SOIC package with 0.209" width matches the original 74AC245SJ footprint. ROHS3 compliance and unlimited MSL rating provide regulatory alignment for modern applications.

SN74AC245DWR (Texas Instruments) offers equivalent electrical performance with active product status and ROHS3 compliance. The 20-SOIC package uses a 0.295" width, requiring PCB layout verification for pin-to-pin compatibility despite identical pin count and electrical function.

SN74AC245IDWREP (Texas Instruments) provides identical electrical specifications with active status and ROHS3 compliance. Package dimensions match SN74AC245DWR, necessitating footprint verification.

Extended Operating Range Alternative:

CD74AC245M96 (Texas Instruments) extends the operating temperature range to -55°C ~ 125°C and supply voltage to 1.5V ~ 5.5V, offering broader environmental capability. This part is actively produced and ROHS3 compliant. The 20-SOIC package with 0.295" width requires footprint assessment.

Avoid:

CD74AC245M (Harris Corporation) is obsolete and RoHS non-compliant, making it unsuitable for new designs despite electrical compatibility.

SN74AC245DW (Texas Instruments) is discontinued at DiGi Electronics, limiting long-term availability.

Frequently Asked Questions (FAQ)

Q: Can SN74AC245NSR directly replace 74AC245SJ without PCB modifications?

A: Yes. SN74AC245NSR maintains identical electrical specifications and the same 20-SOIC package width (0.209", 5.30mm), ensuring pin-to-pin compatibility and direct PCB substitution.

Q: What is the difference between SN74AC245DWR and SN74AC245NSR?

A: Both parts are electrically identical with matching supply voltage (2V ~ 6V) and operating temperature (-40°C ~ 85°C) ranges. The primary difference is packaging format: SN74AC245NSR is supplied in Cut Tape & Digi-Reel format, while SN74AC245DWR is supplied in Cut Tape & Digi-Reel format. Both use 20-SOIC packages, though SN74AC245DWR has a 0.295" width versus SN74AC245NSR's 0.209" width, requiring footprint verification.

Q: Is CD74AC245M96 compatible with designs requiring -40°C ~ 85°C operation?

A: Yes. CD74AC245M96 operates across -55°C ~ 125°C, which encompasses the -40°C ~ 85°C range. However, the extended voltage range (1.5V ~ 5.5V versus 2V ~ 6V) and different package width (0.295" versus 0.209") require circuit analysis and PCB layout verification.

Q: Why should CD74AC245M (Harris) be avoided?

A: CD74AC245M is obsolete and RoHS non-compliant. These factors create supply chain risk and regulatory compliance issues for new production designs.

Q: What packaging considerations apply when substituting with SN74AC245DWR or SN74AC245IDWREP?

A: Both parts use 20-SOIC packages with 0.295" width, compared to the original 74AC245SJ at 0.209" width. While pin count and electrical function remain identical, the wider package may require PCB footprint adjustment. Verify pad spacing and trace routing compatibility before implementation.

Q: Are all recommended substitutes ROHS3 compliant?

A: All active and recommended substitutes (SN74AC245NSR, SN74AC245DWR, SN74AC245IDWREP, CD74AC245M96) are ROHS3 compliant. CD74AC245M is RoHS non-compliant and should not be used in new designs.