SN74LS145D Equivalent & Substitute Parts

Part Overview

The SN74LS145D is a 1 x 4:10 decoder logic integrated circuit manufactured by Texas Instruments in a 16-SOIC surface mount package. This component is classified as discontinued at DiGi Electronics, making identification of compatible substitute parts essential for ongoing design support and procurement. The SN74LS145D operates as a single-circuit decoder with fixed electrical and mechanical specifications that define the scope of acceptable substitutes.

Substiute Parts

SN74LS145D

Texas InstrumentsIn Stock: 1293SN74LS145D Datasheet

Current PartRFQ

SN74LS145DR

Texas InstrumentsIn Stock: 2846SN74LS145DR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS145D is determined by strict equivalence across the following parameters:

• Base product number (74LS145) ensures identical decoder logic and circuit configuration
• Package specification (16-SOIC, 0.154" width, 3.90mm) ensures mechanical and thermal compatibility
• Voltage supply range (4.75V ~ 5.25V) ensures electrical compatibility with existing power distribution
• Current output specification (80mA low) ensures load-driving capability
• Operating temperature range (0°C ~ 70°C) ensures functional performance within specified environmental conditions
• RoHS3 compliance and MSL rating ensure regulatory and manufacturing process compatibility

Substitutes must match all parameters listed above. Deviations in any parameter disqualify a part from direct substitution.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS145D is discontinued at DiGi Electronics. The SN74LS145DR is the direct substitute, manufactured by Texas Instruments with identical electrical and mechanical specifications. The SN74LS145DR maintains active product status and is available in standard packaging formats (Cut Tape and Digi-Reel). Both parts are ROHS3 compliant and carry identical regulatory certifications (REACH Unaffected, ECCN EAR99, HTSUS 8542.39.0001).

Selection of the SN74LS145DR eliminates supply chain risk associated with discontinued inventory while maintaining full functional and physical compatibility with designs specified for the SN74LS145D.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS145DR be used as a direct replacement for the SN74LS145D?

A: Yes. Both parts share identical base product number (74LS145), package specification (16-SOIC), voltage supply range (4.75V ~ 5.25V), current output (80mA), operating temperature (0°C ~ 70°C), and compliance certifications. The SN74LS145DR is the active equivalent.

Q: What is the difference between the SN74LS145D and SN74LS145DR?

A: The primary difference is product status and packaging format. The SN74LS145D is discontinued and supplied in Tube packaging. The SN74LS145DR is active and supplied in Cut Tape and Digi-Reel formats. All electrical and mechanical specifications are identical.

Q: Are there any thermal or environmental differences between these parts?

A: No. Both parts operate across the same temperature range (0°C ~ 70°C) and carry identical moisture sensitivity level (MSL 1, Unlimited). Thermal and environmental performance are equivalent.

Q: Does the packaging format affect compatibility?

A: No. Packaging format (Tube versus Cut Tape/Digi-Reel) affects procurement and handling only. The physical component specifications and electrical performance remain identical.

Q: Are both parts RoHS compliant?

A: Yes. Both the SN74LS145D and SN74LS145DR are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic components.