74AC245SC Equivalent & Substitute Parts

Part Overview

The 74AC245SC is a non-inverting transceiver logic IC manufactured by onsemi, designed for 8-bit bidirectional data transfer with 3-state output capability. This component operates across a 2V to 6V supply voltage range and is housed in a 20-SOIC package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Substiute Parts

74AC245SC

onsemiIn Stock: 139974AC245SC Datasheet

Current PartRFQ

MC74AC245DWG

onsemiIn Stock: 2190MC74AC245DWG Datasheet

DirectRFQ

74AC245SCX

onsemiIn Stock: 328274AC245SCX Datasheet

SimilarRFQ

MC74AC245DWR2G

onsemiIn Stock: 4763MC74AC245DWR2G Datasheet

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CD74AC245M

Harris CorporationIn Stock: 2009CD74AC245M Datasheet

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SN74AC245DW

Texas InstrumentsIn Stock: 2384SN74AC245DW Datasheet

DirectRFQ

SN74AC245DWR

Texas InstrumentsIn Stock: 3285SN74AC245DWR Datasheet

DirectRFQ

SN74AC245IDWREP

Texas InstrumentsIn Stock: 841SN74AC245IDWREP Datasheet

DirectRFQ

CD74AC245M96

Texas InstrumentsIn Stock: 5308CD74AC245M96 Datasheet

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SN74AC245NSR

Texas InstrumentsIn Stock: 7303SN74AC245NSR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74AC245SC is determined by strict equivalence across 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)
• Package / Case: 20-SOIC (0.295", 7.50mm Width)

Substitute parts are grouped into two categories:

Direct Substitutes (Identical Electrical and Mechanical Specifications): Parts that match all critical parameters and operate within the same voltage and temperature ranges with identical output current ratings.

Similar Substitutes (Compatible with Parameter Variations): Parts that maintain functional equivalence but differ in voltage supply range, operating temperature range, or moisture sensitivity level. These require design verification for specific application constraints.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

MC74AC245DWG, 74AC245SCX, MC74AC245DWR2G, SN74AC245DWR, and SN74AC245IDWREP are functionally equivalent to the 74AC245SC across all critical electrical and mechanical parameters. These parts are manufactured by onsemi or Texas Instruments and maintain active product status with ROHS3 compliance. Selection among these options should be based on packaging availability (Tube, Cut Tape & Digi-Reel, or Tape & Reel) and inventory requirements.

Extended Temperature Range Alternatives:

CD74AC245M96 (Texas Instruments) and CD74AC245M (Harris Corporation) provide extended operating temperature range (-55°C ~ 125°C) and broader voltage supply tolerance (1.5V ~ 5.5V). These parts are suitable for applications requiring enhanced thermal performance. CD74AC245M96 maintains ROHS3 compliance and active status, while CD74AC245M is obsolete and non-compliant with RoHS requirements.

Package Variant:

SN74AC245NSR uses a 20-SO package (0.209" width) instead of the standard 20-SOIC (0.295" width). This variant is suitable only for designs where the narrower package footprint is compatible with PCB layout constraints.

Avoid:

SN74AC245DW is discontinued at DiGi Electronics and should not be selected for new designs requiring long-term supply assurance.

Frequently Asked Questions (FAQ)

Q: Can I use SN74AC245NSR as a direct replacement for 74AC245SC?

A: SN74AC245NSR is electrically equivalent but uses a different package footprint (20-SO vs. 20-SOIC). It is compatible only if your PCB layout accommodates the narrower 0.209" package width. Verify pin compatibility and board layout before substitution.

Q: What is the difference between MC74AC245DWG and 74AC245SCX?

A: Both parts are onsemi 74AC245 variants with identical electrical specifications. MC74AC245DWG is supplied in Tube packaging, while 74AC245SCX is supplied in Cut Tape & Digi-Reel format. Selection depends on your procurement and assembly process requirements.

Q: Are CD74AC245M96 and CD74AC245M suitable replacements for the 74AC245SC?

A: Both CD74AC245 variants are functionally compatible with extended operating temperature range (-55°C ~ 125°C) and broader voltage tolerance (1.5V ~ 5.5V). CD74AC245M96 is recommended as it maintains active status and ROHS3 compliance. CD74AC245M is obsolete and non-compliant. Use these variants only if your application requires the extended temperature or voltage specifications.

Q: What does MSL (Moisture Sensitivity Level) mean for component selection?

A: MSL indicates the maximum time a component can be exposed to moisture before soldering. The 74AC245SC has MSL 1 (Unlimited), meaning no moisture exposure restrictions. onsemi variants MC74AC245DWG and 74AC245SCX have MSL 3 (168 Hours), requiring storage in dry conditions and limiting shelf life after moisture exposure. For applications with strict moisture control requirements, verify your storage and handling procedures.

Q: Which substitute offers the best long-term availability?

A: SN74AC245DWR (Texas Instruments) and SN74AC245IDWREP (Texas Instruments) are both active products with established supply chains. MC74AC245DWR2G and 74AC245SCX (onsemi) are also active. Verify current inventory and lead times with your component supplier for your specific procurement timeline.

Q: Can I mix different manufacturers' parts in the same design?

A: Yes. All recommended substitutes maintain identical electrical specifications (voltage, current, temperature range, logic function). Cross-manufacturer substitution is acceptable from an electrical standpoint. Verify packaging and MSL requirements for your assembly process.