SN74LS123DRG4 Equivalent & Substitute Parts

Part Overview

The SN74LS123DRG4 is a monostable multivibrator IC 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 equivalent substitutes necessary for ongoing production and maintenance applications. The part operates within the standard 74LS logic family specifications and is ROHS3 compliant.

Substiute Parts

SN74LS123DRG4

Texas InstrumentsIn Stock: 731SN74LS123DRG4 Datasheet

Current PartRFQ

SN74LS123DR

Texas InstrumentsIn Stock: 45487SN74LS123DR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS123DRG4 is determined by strict equivalence across the following critical parameters:

• Logic Type: Monostable Multivibrator with dual independent circuits
• Propagation Delay: 28 ns
• Current Specifications: Output High 400µA, Output Low 8mA
• Supply Voltage Range: 4.75 V ~ 5.25 V
• Operating Temperature Range: 0°C ~ 70°C
• Package Configuration: 16-SOIC surface mount
• Base Product Number: 74LS123
• Compliance: ROHS3 Compliant, REACH Unaffected

The SN74LS123DR qualifies as a direct substitute based on identical electrical characteristics and package specifications. The primary distinction is product status and packaging format availability.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS123DR is the direct equivalent for the discontinued SN74LS123DRG4. Both parts share identical electrical specifications, package geometry, and compliance certifications. The SN74LS123DR maintains active product status with higher inventory availability and flexible packaging options (Cut Tape and Digi-Reel formats). Selection of the SN74LS123DR eliminates obsolescence risk while maintaining full functional and mechanical compatibility. Both parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS123DR directly replace the SN74LS123DRG4 in existing designs?

A: Yes. The SN74LS123DR is electrically and mechanically identical to the SN74LS123DRG4. Both parts feature the same 28 ns propagation delay, dual independent monostable circuits, output current specifications, supply voltage range, operating temperature range, and 16-SOIC package configuration. No design modifications are required.

Q: What is the primary reason for substitution?

A: The SN74LS123DRG4 is discontinued at DiGi Electronics. The SN74LS123DR provides continued availability with active product status and higher inventory levels.

Q: Are there package differences between these parts?

A: Both parts use the 16-SOIC (0.154", 3.90mm Width) surface mount package. The SN74LS123DR offers additional packaging flexibility with both Cut Tape (CT) and Digi-Reel® formats available.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the SN74LS123DRG4 and SN74LS123DR are ROHS3 compliant, REACH unaffected, and carry identical MSL ratings of 1 (Unlimited).

Q: What are the critical electrical parameters that define substitution?

A: Substitution is based on matching propagation delay (28 ns), output current specifications (400µA high, 8mA low), supply voltage range (4.75 V ~ 5.25 V), operating temperature range (0°C ~ 70°C), and dual independent monostable circuit configuration.