SN74ALS623ADWR Equivalent & Substitute Parts

Part Overview

The SN74ALS623ADWR is a non-inverting transceiver logic IC manufactured by Texas Instruments, designed for 8-bit data bus applications with 3-state output capability. This component operates within a 4.5V to 5.5V supply voltage range and is housed in a 20-SOIC surface mount package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

SN74ALS623ADWR

Texas InstrumentsIn Stock: 1186SN74ALS623ADWR Datasheet

Current PartRFQ

SN74ALS245A-1DWR

Texas InstrumentsIn Stock: 791SN74ALS245A-1DWR Datasheet

Parametric EquivalentRFQ

SN74ALS245ADWR

Texas InstrumentsIn Stock: 1693SN74ALS245ADWR Datasheet

Parametric EquivalentRFQ

SN74ALS645A-1DWR

Texas InstrumentsIn Stock: 1202SN74ALS645A-1DWR Datasheet

Parametric EquivalentRFQ

SN74ALS645ADWR

Texas InstrumentsIn Stock: 1150SN74ALS645ADWR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74ALS623ADWR are determined by strict parametric equivalence across the following critical criteria:

Electrical Parameters (Must Match):

• Logic Type: Transceiver, Non-Inverting
• Number of Elements: 1
• Number of Bits per Element: 8
• Output Type: 3-State
• Current - Output High, Low: 15mA, 24mA
• Voltage - Supply: 4.5V ~ 5.5V
• Operating Temperature: 0°C ~ 70°C (TA)

Mechanical Parameters (Must Match):

• Package / Case: 20-SOIC (0.295", 7.50mm Width)
• Mounting Type: Surface Mount

Compliance Parameters (Must Match):

• Series: 74ALS
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

All four substitute parts listed below meet these exact specifications and are therefore direct parametric equivalents suitable for replacement in applications currently using the SN74ALS623ADWR.

Parameter Comparison

Engineering Selection Recommendations

All four substitute parts—SN74ALS245A-1DWR, SN74ALS245ADWR, SN74ALS645A-1DWR, and SN74ALS645ADWR—are parametrically equivalent to the SN74ALS623ADWR and meet identical electrical, mechanical, and compliance specifications. The primary distinction between these alternatives is product status and packaging format.

The SN74ALS623ADWR is classified as obsolete, whereas all substitute parts maintain active product status with Texas Instruments. This status difference ensures long-term availability and supply chain continuity for new designs and ongoing production requirements.

Packaging format varies among substitutes: SN74ALS245A-1DWR and SN74ALS645A-1DWR are supplied in Tape & Reel (TR) format, SN74ALS245ADWR is available in Cut Tape (CT) & Digi-Reel® format, and SN74ALS645ADWR is supplied in Tape & Reel (TR) format. Selection between these alternatives should be based on procurement requirements and assembly process compatibility.

All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) rating, ensuring compatibility with modern manufacturing standards and environmental regulations.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS245A-1DWR, SN74ALS245ADWR, SN74ALS645A-1DWR, or SN74ALS645ADWR be used as direct replacements for SN74ALS623ADWR?

A: Yes. All four parts are parametrically equivalent across all critical electrical, mechanical, and compliance parameters. They share identical logic type (non-inverting transceiver), bit configuration (1 element, 8 bits per element), output type (3-state), current ratings (15mA/24mA), supply voltage range (4.5V–5.5V), operating temperature range (0°C–70°C), and package specification (20-SOIC surface mount). Direct substitution is supported without circuit modification.

Q: Why is the SN74ALS623ADWR classified as obsolete?

A: The SN74ALS623ADWR has reached end-of-life status with Texas Instruments. The substitute parts listed—all with active product status—provide equivalent functionality and are recommended for new designs and ongoing production support.

Q: What is the difference between Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® packaging?

A: Tape & Reel (TR) packaging supplies components on continuous tape wound on reels, suitable for high-volume automated assembly. Cut Tape (CT) & Digi-Reel® packaging provides components on tape segments or alternative reel formats, accommodating lower-volume or mixed-component assembly processes. Electrical and mechanical specifications remain identical regardless of packaging format.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts—SN74ALS245A-1DWR, SN74ALS245ADWR, SN74ALS645A-1DWR, and SN74ALS645ADWR—are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, meeting current environmental and manufacturing standards.

Q: Can I mix substitute parts within the same assembly?

A: Yes. All substitute parts meet identical parametric specifications and are therefore interchangeable within the same circuit or assembly. Packaging format selection should be based on procurement and assembly process requirements rather than electrical compatibility.