SN74LS145NG4 Equivalent & Substitute Parts

Part Overview

The SN74LS145NG4 is a logic decoder integrated circuit manufactured by Texas Instruments, classified as a 1 x 4:10 decoder in a 16-DIP package. This component is discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design and production requirements. The decoder function remains consistent across qualified substitutes, provided electrical and mechanical parameters align with the original specification.

Substiute Parts

SN74LS145NG4

Texas InstrumentsIn Stock: 660SN74LS145NG4 Datasheet

Current PartRFQ

SN74LS145N

Texas InstrumentsIn Stock: 2100SN74LS145N Datasheet

MFR RecommendedRFQ

SN74145N

Texas InstrumentsIn Stock: 2205SN74145N Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS145NG4 is determined by strict equivalence across the following critical parameters:

• Circuit configuration (1 x 4:10 decoder function)
• Output current capability (80mA low)
• Supply voltage range (4.75V ~ 5.25V)
• Operating temperature range (0°C ~ 70°C)
• Package type (16-DIP through-hole)
• Compliance certifications (ROHS3, REACH Unaffected)

Two substitute parts meet these criteria: the SN74LS145N (manufacturer recommended) and the SN74145N (parametric equivalent). Both maintain identical electrical performance and physical form factor, differing only in series designation and product status.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS145N is the primary substitute for the discontinued SN74LS145NG4. Both parts share identical series designation (74LS), active product status for the substitute, and equivalent electrical specifications. The SN74LS145N maintains full compatibility with existing designs and offers superior availability.

The SN74145N serves as a parametric equivalent, offering identical electrical performance and package configuration. The distinction lies in series classification (7400 versus 74LS), reflecting different logic family generations. Both parts satisfy the functional and compliance requirements of the original specification.

Selection between SN74LS145N and SN74145N depends on design constraints and supply chain considerations. The SN74LS145N is recommended for direct replacement due to series alignment with the original part.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS145N directly replace the SN74LS145NG4?

A: Yes. The SN74LS145N is electrically and mechanically equivalent to the SN74LS145NG4. Both parts share identical decoder configuration, output current ratings, supply voltage range, operating temperature, and 16-DIP package specifications. The primary difference is product status: the SN74LS145N is active, while the SN74LS145NG4 is discontinued.

Q: What is the difference between the SN74LS145N and SN74145N?

A: Both parts are parametric equivalents with identical electrical performance and package type. The distinction is series designation: SN74LS145N belongs to the 74LS logic family, while SN74145N belongs to the 7400 family. This reflects different manufacturing generations but does not affect functional compatibility in applications requiring 1 x 4:10 decoder operation at specified voltage and current ratings.

Q: Are all three parts pin-compatible?

A: Yes. The SN74LS145NG4, SN74LS145N, and SN74145N all use the 16-DIP package with identical pinout. Direct socket substitution is possible without circuit modification.

Q: Do the substitute parts meet the same compliance requirements?

A: Yes. All three parts are ROHS3 compliant and REACH unaffected, matching the original specification.

Q: What inventory status should I consider when selecting a substitute?

A: The SN74LS145N has 2038 units in stock, and the SN74145N has 2120 units in stock. Both offer active product status with established supply availability, unlike the discontinued SN74LS145NG4.