SN74LS123NG4 Equivalent & Substitute Parts

Part Overview

The SN74LS123NG4 is a monostable multivibrator IC manufactured by Texas Instruments, featuring dual independent circuits with 28 ns propagation delay in a 16-DIP package. This component is discontinued at DiGi Electronics, making identification of equivalent substitute parts essential for ongoing design support and procurement. The part operates within the 74LS logic family standard and maintains compatibility through standardized electrical and mechanical parameters.

Substiute Parts

SN74LS123NG4

Texas InstrumentsIn Stock: 862SN74LS123NG4 Datasheet

Current PartRFQ

SN74LS123N

Texas InstrumentsIn Stock: 6112SN74LS123N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS123NG4 is determined by strict equivalence across the following parameters:

• Logic Type: Monostable multivibrator function
• Independent Circuits: Dual circuit configuration
• Propagation Delay: 28 ns timing specification
• Output Current Characteristics: 400µA high, 8mA low
• Supply Voltage Range: 4.75 V ~ 5.25 V
• Operating Temperature Range: 0°C ~ 70°C
• Package Configuration: 16-DIP through-hole mounting
• Electrical Compliance: ROHS3 and REACH standards

The SN74LS123N qualifies as a direct substitute based on identical electrical specifications and package geometry. The primary distinction is product status and packaging format.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS123N is the appropriate substitute for the discontinued SN74LS123NG4. Both parts maintain identical electrical and mechanical specifications, ensuring direct functional equivalence in circuit applications. The SN74LS123N carries active product status with established supply availability, addressing the discontinuation of the original part number. Both components satisfy ROHS3 and REACH compliance requirements, maintaining regulatory alignment for new designs and legacy system support.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS123N directly replace the SN74LS123NG4 in existing designs?

A: Yes. The SN74LS123N provides direct substitution. Both parts share identical propagation delay (28 ns), output current specifications (400µA, 8mA), supply voltage range (4.75 V ~ 5.25 V), operating temperature range (0°C ~ 70°C), and 16-DIP package geometry. No circuit modifications are required.

Q: What is the difference between SN74LS123NG4 and SN74LS123N?

A: The primary differences are product status and packaging format. The SN74LS123NG4 is discontinued, while the SN74LS123N maintains active status. The SN74LS123N is supplied in tube packaging, whereas the original part number designation reflects a different packaging configuration. Electrical performance is identical.

Q: Are there any compliance or certification differences?

A: Both parts maintain ROHS3 compliance and REACH unaffected status. The SN74LS123N does not specify Moisture Sensitivity Level (MSL), whereas the SN74LS123NG4 is rated MSL 1 (Unlimited). This does not affect functional substitution for standard through-hole mounting applications.

Q: Is the 16-DIP package compatible with existing PCB layouts?

A: Yes. Both the SN74LS123NG4 and SN74LS123N use identical 16-DIP (0.300", 7.62mm) through-hole package geometry. PCB footprints and mounting requirements remain unchanged.

Q: What supply voltage range should be used with these parts?

A: Both parts operate within 4.75 V to 5.25 V supply voltage range. This standard 5V logic supply specification applies to both the main part and substitute.