SN74LS423NG4 Equivalent & Substitute Parts

Part Overview

The SN74LS423NG4 is a monostable multivibrator logic IC manufactured by Texas Instruments, featuring 28 ns propagation delay in a 16-DIP package. This part is discontinued at DiGi Electronics, making substitute parts necessary for ongoing production and maintenance applications. The device provides two independent circuits suitable for timing and pulse generation in digital logic systems operating at standard TTL voltage levels.

Substiute Parts

SN74LS423NG4

Texas InstrumentsIn Stock: 1099SN74LS423NG4 Datasheet

Current PartRFQ

SN74LS423N

Texas InstrumentsIn Stock: 3442SN74LS423N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SN74LS423NG4 is determined by the following critical parameters:

• Logic type and circuit configuration (monostable multivibrator with 2 independent circuits)
• Propagation delay specification (28 ns)
• Output current ratings (400µA high, 8mA low)
• Supply voltage range (4.75 V ~ 5.25 V)
• Package type and pin configuration (16-DIP)
• Mounting technology (through hole)

The SN74LS423N qualifies as a direct substitute based on matching all electrical and mechanical parameters. The primary distinction is product status and packaging format, with the SN74LS423N currently active in inventory.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS423N is the direct substitute for the SN74LS423NG4. Both parts are manufactured by Texas Instruments with identical electrical specifications and package configurations. The SN74LS423N maintains active product status with current inventory availability, whereas the SN74LS423NG4 is discontinued. Both parts meet ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for new designs and legacy system maintenance.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS423N directly replace the SN74LS423NG4 in existing designs?

A: Yes. The SN74LS423N is electrically and mechanically identical to the SN74LS423NG4. All electrical parameters, pin configurations, and package dimensions match exactly, enabling direct substitution without circuit modification.

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

A: The primary difference is product status. The SN74LS423NG4 is discontinued, while the SN74LS423N remains active with current inventory. Both parts share the same base product number (74LS423) and identical specifications.

Q: Are there any compatibility concerns with the 16-DIP package?

A: No. Both parts use the standard 16-DIP (0.300", 7.62mm) through-hole package. Pin assignments and mechanical dimensions are identical, ensuring compatibility with existing PCB layouts and socket configurations.

Q: Do both parts meet current compliance requirements?

A: Yes. Both the SN74LS423NG4 and SN74LS423N are ROHS3 compliant and REACH unaffected, meeting current regulatory standards for electronics manufacturing and distribution.

Q: What is the propagation delay specification for these parts?

A: Both parts specify 28 ns propagation delay, maintaining timing performance in monostable multivibrator applications requiring this switching speed.