SN74HC645DWR Equivalent & Substitute Parts

Part Overview

The SN74HC645DWR is a non-inverting transceiver logic integrated circuit manufactured by Texas Instruments. This 20-SOIC surface mount device functions as a 1-element, 8-bit per element transceiver with 3-state output capability, operating across a 2V to 6V supply voltage range. The device is classified as Active product status with full ROHS3 compliance and REACH unaffected designation. Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing, different packaging formats, or extended inventory availability while maintaining electrical and mechanical compatibility.

Substiute Parts

SN74HC645DWR

Texas InstrumentsIn Stock: 3210SN74HC645DWR Datasheet

Current PartRFQ

SN74HC245DWR

Texas InstrumentsIn Stock: 131463SN74HC245DWR Datasheet

Parametric EquivalentRFQ

74HC245D,653

Nexperia USA Inc.In Stock: 228174HC245D,653 Datasheet

MFR RecommendedRFQ

MM74HC245AWMX

onsemiIn Stock: 1882MM74HC245AWMX Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74HC645DWR are qualified based on matching the following critical parameters: Logic Type (Transceiver, Non-Inverting), Number of Elements (1), Number of Bits per Element (8), Output Type (3-State), Output Current specifications (7.8mA, 7.8mA), Supply Voltage range (2V ~ 6V), Package / Case (20-SOIC), and Mounting Type (Surface Mount). All identified substitutes maintain the 74HC base product number designation and are classified as Active product status with ROHS3 compliance. Substitution eligibility is determined by electrical parameter equivalence and mechanical package compatibility, with packaging format variations (Cut Tape, Digi-Reel, Tape & Reel) representing distribution options rather than functional differences.

Parameter Comparison

Engineering Selection Recommendations

All identified substitute parts maintain full electrical equivalence with the SN74HC645DWR across critical operating parameters. Selection between substitutes is determined by availability, packaging format requirements, and moisture sensitivity specifications. The SN74HC245DWR (Texas Instruments) and MM74HC245AWMX (onsemi) are direct parametric equivalents with identical electrical characteristics. The 74HC245D,653 (Nexperia USA Inc.) offers extended operating temperature range (-40°C ~ 125°C) compared to the primary part (-40°C ~ 85°C), providing enhanced thermal performance for applications requiring higher temperature operation. The MM74HC245AWMX carries MSL 3 (168 Hours) moisture sensitivity versus MSL 1 (Unlimited) for other options, requiring appropriate handling protocols during storage and assembly. All parts maintain ROHS3 compliance and Active product status, ensuring long-term availability and regulatory conformance.

Frequently Asked Questions (FAQ)

Q: What determines if a part can substitute for the SN74HC645DWR? A: Substitution eligibility requires matching Logic Type (Transceiver, Non-Inverting), Element and Bit configuration (1 Element, 8 Bits per Element), Output Type (3-State), Output Current specifications (7.8mA, 7.8mA), Supply Voltage range (2V ~ 6V), and Package / Case (20-SOIC). All identified substitutes meet these criteria.

Q: Are there differences in operating temperature ranges among the substitutes? A: The 74HC245D,653 (Nexperia) operates across -40°C ~ 125°C, providing 40°C extended upper temperature limit compared to the SN74HC645DWR and SN74HC245DWR (-40°C ~ 85°C). The MM74HC245AWMX matches the -40°C ~ 85°C range of the primary part.

Q: What is the significance of MSL (Moisture Sensitivity Level) differences? A: The SN74HC645DWR, SN74HC245DWR, and 74HC245D,653 carry MSL 1 (Unlimited), requiring no special moisture control during storage. The MM74HC245AWMX carries MSL 3 (168 Hours), requiring controlled humidity storage and bake-out procedures before assembly to prevent moisture-induced defects.

Q: Do packaging format variations affect electrical compatibility? A: Packaging formats (Cut Tape, Digi-Reel, Tape & Reel) represent distribution and handling methods only. All substitutes maintain identical 20-SOIC package dimensions and surface mount compatibility, ensuring PCB footprint and assembly process equivalence.

Q: Are all substitutes ROHS3 compliant? A: All identified substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the regulatory profile of the SN74HC645DWR.