SN74LS123DRE4 Equivalent & Substitute Parts

Part Overview

The SN74LS123DRE4 is a monostable multivibrator logic integrated circuit manufactured by Texas Instruments, featuring dual independent circuits with 28 ns propagation delay in a 16-SOIC surface mount package. This part is discontinued at DiGi Electronics, making identification of equivalent substitute components essential for ongoing production and maintenance applications. The functional characteristics and electrical parameters of this device remain relevant for legacy system support and new designs requiring monostable multivibrator functionality within the 74LS logic family specifications.

Substiute Parts

SN74LS123DRE4

Texas InstrumentsIn Stock: 1118SN74LS123DRE4 Datasheet

Current PartRFQ

SN74LS123DR

Texas InstrumentsIn Stock: 45487SN74LS123DR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS123DRE4 is determined by strict equivalence across the following critical parameters:

• Logic Type: Monostable Multivibrator
• Independent Circuits: 2
• Propagation Delay: 28 ns
• Current Specifications: Output High 400µA, Output Low 8mA
• Voltage Supply Range: 4.75 V ~ 5.25 V
• Operating Temperature Range: 0°C ~ 70°C
• Package Configuration: 16-SOIC surface mount
• Base Product Number: 74LS123

The SN74LS123DR meets all electrical and mechanical substitution criteria for the discontinued SN74LS123DRE4. Both devices share identical functional specifications, electrical performance characteristics, and physical packaging requirements. The primary distinction is product status and packaging format availability.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS123DR is the direct substitute for the discontinued SN74LS123DRE4. Both components are manufactured by Texas Instruments and maintain identical electrical specifications, timing characteristics, and physical packaging. The SN74LS123DR carries active product status with established supply chain availability, whereas the SN74LS123DRE4 is discontinued.

Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for industrial and commercial applications. The MSL rating of 1 (Unlimited) indicates no moisture sensitivity constraints during storage and handling.

For applications currently using the SN74LS123DRE4, direct substitution with the SN74LS123DR requires no circuit modifications, PCB layout changes, or firmware adjustments. Pin configuration, electrical performance, and thermal characteristics remain identical across both part numbers.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS123DR directly replace the SN74LS123DRE4 without circuit modifications?

A: Yes. Both parts are electrically and mechanically identical. Pin configuration, voltage supply requirements, propagation delay, output current specifications, and operating temperature range are equivalent. Direct substitution is valid for all applications.

Q: What is the difference between SN74LS123DRE4 and SN74LS123DR?

A: The primary difference is product status and packaging format. The SN74LS123DRE4 is discontinued at DiGi Electronics, while the SN74LS123DR maintains active status. Both share the same 16-SOIC package, electrical specifications, and manufacturing origin from Texas Instruments.

Q: Are there any compliance or certification differences between these parts?

A: No. Both the SN74LS123DRE4 and SN74LS123DR carry identical RoHS3 compliance, REACH unaffected status, and MSL rating of 1 (Unlimited). Regulatory and environmental certifications are equivalent.

Q: What packaging formats are available for the SN74LS123DR?

A: The SN74LS123DR is available in Cut Tape (CT) and Digi-Reel® packaging formats, providing flexibility for both prototype and production volume requirements.

Q: Is the 16-SOIC package compatible with existing PCB designs for the SN74LS123DRE4?

A: Yes. Both parts use the 16-SOIC (0.154", 3.90mm Width) surface mount package. PCB footprints, solder pad layouts, and component placement are identical. No PCB redesign is required.