SN74LS145DG4 Equivalent & Substitute Parts

Part Overview

The SN74LS145DG4 is a 1 x 4:10 decoder logic integrated circuit manufactured by Texas Instruments in a 16-SOIC surface mount package. This component is discontinued at DiGi Electronics. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for production and repair applications.

Substiute Parts

SN74LS145DG4

Texas InstrumentsIn Stock: 937SN74LS145DG4 Datasheet

Current PartRFQ

SN74LS145DR

Texas InstrumentsIn Stock: 2846SN74LS145DR Datasheet

DirectRFQ

SN74LS145D

Texas InstrumentsIn Stock: 1293SN74LS145D Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74LS145DG4 are qualified based on the following criteria:

• Identical decoder circuit configuration (1 x 4:10)
• Matching electrical specifications: 4.75V ~ 5.25V supply voltage, 80mA output current, 0°C ~ 70°C operating temperature range
• Identical package type: 16-SOIC surface mount
• Same series classification: 74LS
• Compliance with RoHS3 and REACH requirements
• Moisture sensitivity level MSL 1

The SN74LS145DG4 differs from substitute parts only in packaging format (DG4 variant). Substitute parts maintain full functional and electrical equivalence while offering different packaging or availability options.

Parameter Comparison

Engineering Selection Recommendations

For applications currently using the SN74LS145DG4, the SN74LS145DR is the primary substitute. This part maintains active product status at the manufacturer and is available in Cut Tape and Digi-Reel packaging formats, ensuring reliable supply chain access. All three parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

The SN74LS145D is functionally equivalent but shares discontinued status with the original part. Selection between SN74LS145DR and SN74LS145D should prioritize availability and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Are SN74LS145DG4, SN74LS145DR, and SN74LS145D pin-for-pin compatible?

A: Yes. All three parts use the 16-SOIC package with identical pinout and electrical characteristics. They are direct functional equivalents.

Q: What is the difference between these substitute parts?

A: The parts differ only in packaging format and product status. SN74LS145DG4 and SN74LS145D are discontinued; SN74LS145DR is active. SN74LS145DR uses Cut Tape and Digi-Reel packaging, while SN74LS145D uses Tube packaging.

Q: Can I use SN74LS145DR as a direct replacement for SN74LS145DG4?

A: Yes. The SN74LS145DR is electrically and functionally identical. The only consideration is packaging format compatibility with your assembly process.

Q: Are there any compliance differences between these parts?

A: No. All three parts are ROHS3 compliant, REACH unaffected, and have identical moisture sensitivity levels (MSL 1).

Q: What supply voltage range do these decoders support?

A: All three parts operate with a single supply voltage range of 4.75V ~ 5.25V.

Q: What is the maximum output current for these decoders?

A: The maximum output low current is 80mA for all three parts.