SN74LS123DG4 Equivalent & Substitute Parts

Part Overview

The SN74LS123DG4 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 component is discontinued at DiGi Electronics, making identification of equivalent substitute parts essential for ongoing design support and production continuity. The part operates within the 74LS logic family standard and maintains compatibility through functionally equivalent alternatives that meet identical electrical and mechanical specifications.

Substiute Parts

SN74LS123DG4

Texas InstrumentsIn Stock: 869SN74LS123DG4 Datasheet

Current PartRFQ

SN74LS123D

Texas InstrumentsIn Stock: 1974SN74LS123D Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS123DG4 is determined by strict equivalence across the following critical parameters:

• Logic Type: Monostable Multivibrator with dual independent circuits
• 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
• Package Configuration: 16-SOIC surface mount
• Base Product Number: 74LS123
• Compliance Standards: ROHS3, REACH Unaffected

The SN74LS123D qualifies as a direct substitute based on identical electrical characteristics and package specifications. The primary distinction is product status and packaging format, with the substitute part currently active in production.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS123D is the appropriate substitute for the discontinued SN74LS123DG4. Both parts maintain identical electrical performance specifications and package configurations. The substitute part is currently in active production status, ensuring availability for new designs and production replenishment. Both components satisfy ROHS3 compliance requirements and carry equivalent moisture sensitivity ratings. Selection of the SN74LS123D eliminates obsolescence risk while preserving full functional and mechanical compatibility with existing circuit designs.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS123D directly replace the SN74LS123DG4 in existing designs?

A: Yes. Both parts share identical electrical specifications, including propagation delay, output current ratings, supply voltage range, and operating temperature range. The 16-SOIC package dimensions and surface mount configuration are equivalent, enabling direct PCB-level substitution without design modification.

Q: What is the primary difference between these two part numbers?

A: The SN74LS123DG4 is discontinued at DiGi Electronics, while the SN74LS123D remains in active production. The packaging format differs (the main part uses a specific DiGi Electronics designation, while the substitute uses standard tube packaging), but electrical and mechanical characteristics are identical.

Q: Are there any compliance or certification differences?

A: No. Both parts carry ROHS3 compliance status and maintain REACH Unaffected designation. Moisture sensitivity levels are identical at MSL 1 (Unlimited), indicating no special handling requirements during storage or assembly.

Q: What parameters must remain constant for substitution to be valid?

A: Substitution validity depends on maintaining the 28 ns propagation delay, dual independent circuit configuration, 400µA/8mA output current specifications, 4.75 V ~ 5.25 V supply voltage range, 0°C ~ 70°C operating temperature range, and 16-SOIC surface mount package format.

Q: Is the SN74LS123D available in alternative packages?

A: The provided data specifies the 16-SOIC surface mount package for the substitute part. Alternative package options, if available, would be designated by different part number suffixes and would require separate evaluation against design requirements.