SN74LS390NG4 Equivalent & Substitute Parts

Part Overview

The SN74LS390NG4 is a decade counter logic IC manufactured by Texas Instruments, featuring two independent 4-bit counter elements with negative edge triggering. This component is classified as a discontinued product at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design requirements and production needs. The part operates within the 74LS logic family standard and maintains ROHS3 compliance.

Substiute Parts

SN74LS390NG4

Texas InstrumentsIn Stock: 1019SN74LS390NG4 Datasheet

Current PartRFQ

SN74LS390N

Texas InstrumentsIn Stock: 901SN74LS390N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS390NG4 is determined by strict equivalence across the following critical parameters:

• Logic Type: Counter, Decade (2 independent 4-bit elements)
• Trigger Type: Negative Edge
• Reset Configuration: Asynchronous
• Count Rate: 35 MHz minimum
• Voltage Supply Range: 4.75 V ~ 5.25 V
• Package Type: 16-DIP (0.300", 7.62mm)
• Mounting Type: Through Hole
• Operating Temperature Range: 0°C ~ 70°C

The SN74LS390N qualifies as a direct substitute based on identical electrical specifications and pinout compatibility. The primary distinction is product status and packaging format (tube vs. individual packaging).

Parameter Comparison

Engineering Selection Recommendations

The SN74LS390N is the direct equivalent for the discontinued SN74LS390NG4. Both components maintain identical electrical characteristics, pinout configuration, and mechanical specifications. The SN74LS390N carries active product status, ensuring continued availability and supply chain reliability. Both parts satisfy ROHS3 compliance requirements and REACH unaffected status, supporting regulatory requirements for current manufacturing environments.

Selection of the SN74LS390N eliminates obsolescence risk while preserving full functional compatibility with existing circuit designs. The packaging format difference (tube vs. individual) does not affect electrical performance or board-level integration.

Frequently Asked Questions (FAQ)

Q: Are the SN74LS390NG4 and SN74LS390N electrically identical?

A: Yes. Both components share identical electrical specifications, including counter logic type, element configuration, trigger characteristics, supply voltage range, count rate, and operating temperature range.

Q: Can the SN74LS390N be used as a direct replacement in existing designs?

A: Yes. The SN74LS390N provides direct pin-for-pin compatibility and identical functional performance. No circuit modifications are required.

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

A: The primary difference is product status. The SN74LS390NG4 is discontinued, while the SN74LS390N remains in active production. Packaging format also differs (individual vs. tube), but this does not affect electrical or mechanical compatibility.

Q: Are both parts RoHS compliant?

A: Yes. Both the SN74LS390NG4 and SN74LS390N are ROHS3 compliant and REACH unaffected.

Q: What is the 16-DIP package specification?

A: The 16-DIP package is a 16-pin dual inline package with 0.300" (7.62mm) row spacing, designed for through-hole mounting on standard PCB layouts.

Q: Can these parts operate at supply voltages outside the 4.75 V ~ 5.25 V range?

A: No. Both components are specified for operation within the 4.75 V ~ 5.25 V supply voltage range. Operation outside this range is not supported.

Q: What is the maximum count rate for these counters?

A: Both components support a maximum count rate of 35 MHz.