SN74LS90DRG4 Equivalent & Substitute Parts

Part Overview

The SN74LS90DRG4 is a decade counter IC manufactured by Texas Instruments, classified as a 4-bit logic counter in the 74LS series. This component functions as a negative edge-triggered counter with asynchronous reset capability, operating at a maximum count rate of 42 MHz. The part is discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and maintenance applications. Active alternatives with identical electrical and mechanical specifications are available to ensure design continuity.

Substiute Parts

SN74LS90DRG4

Texas InstrumentsIn Stock: 718SN74LS90DRG4 Datasheet

Current PartRFQ

SN74LS90DR

Texas InstrumentsIn Stock: 2186SN74LS90DR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS90DRG4 is determined by strict equivalence across the following critical parameters:

• Logic Type: Counter, Decade (1 Element, 4 Bit)
• Trigger Type: Negative Edge
• Reset Configuration: Asynchronous
• Count Rate: 42 MHz minimum
• Supply Voltage Range: 4.75 V ~ 5.25 V
• Operating Temperature Range: 0°C ~ 70°C
• Package / Case: 14-SOIC (0.154", 3.90mm Width)
• Mounting Type: Surface Mount
• Base Product Number: 74LS90

The SN74LS90DR meets all substitution criteria as a parametric equivalent. Both parts share identical electrical specifications, mechanical dimensions, and functional characteristics. The primary distinction is packaging format and product status.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS90DR is the direct parametric equivalent for the discontinued SN74LS90DRG4. Both components are manufactured by Texas Instruments and maintain identical electrical and mechanical specifications. The SN74LS90DR carries Active product status, ensuring ongoing availability and supply chain continuity.

Both parts comply with ROHS3 and REACH requirements, meeting current environmental and regulatory standards. The MSL rating of 1 (Unlimited) indicates no moisture sensitivity constraints for either component.

Selection between these parts should be based on packaging format requirements. The SN74LS90DRG4 is supplied in Digi-Reel® format, while the SN74LS90DR is available in Cut Tape (CT) and Digi-Reel® packaging options. Inventory availability and procurement lead times should also be considered in component selection.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS90DR directly replace the SN74LS90DRG4 in existing designs?

A: Yes. Both components are parametric equivalents with identical electrical specifications, pin configurations, and mechanical dimensions. Direct substitution is supported without design modifications.

Q: What is the difference between SN74LS90DRG4 and SN74LS90DR?

A: The primary difference is packaging format and product status. The SN74LS90DRG4 is discontinued, while the SN74LS90DR is active. Both share the same 14-SOIC package dimensions and electrical characteristics.

Q: Are there any compatibility concerns with PCB assembly?

A: No. Both parts use identical 14-SOIC surface mount packaging with 0.154" (3.90mm) width. PCB footprints, reflow profiles, and assembly processes remain unchanged.

Q: What supply voltage range is supported?

A: Both the SN74LS90DRG4 and SN74LS90DR operate within 4.75 V to 5.25 V supply voltage range, consistent with standard TTL logic levels.

Q: Is the SN74LS90DR environmentally compliant?

A: Yes. The SN74LS90DR is ROHS3 compliant and REACH unaffected, meeting current environmental regulations.

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

A: Both components support a maximum count rate of 42 MHz with negative edge triggering.