SN74LS90DG4 Equivalent & Substitute Parts

Part Overview

The SN74LS90DG4 is a decade counter IC manufactured by Texas Instruments, designed for 4-bit negative edge-triggered counting applications. This device is classified as discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and maintenance applications. The part operates within a 4.75 V to 5.25 V supply range with a maximum count rate of 42 MHz and supports asynchronous reset functionality in a 14-SOIC surface mount package.

Substiute Parts

SN74LS90DG4

Texas InstrumentsIn Stock: 727SN74LS90DG4 Datasheet

Current PartRFQ

SN74LS90D

onsemiIn Stock: 19389SN74LS90D Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74LS90DG4 is determined by the following critical parameters:

• Logic Type: Counter, Decade (1 Element, 4 Bit)
• Trigger Type: Negative Edge
• Count Rate: 42 MHz
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 14-SOIC (0.154", 3.90mm Width)
• Reset: Asynchronous
• Direction: Up

The SN74LS90D from onsemi meets all electrical and mechanical substitution criteria. Both devices share identical logic functionality, timing specifications, supply voltage requirements, operating temperature range, and package configuration. The base product number 74LS90 confirms functional equivalence across both parts.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS90D from onsemi is a direct functional equivalent to the SN74LS90DG4. Both devices are based on the 74LS90 base product number and share identical electrical specifications, timing characteristics, and physical packaging.

Selection between these parts should be based on:

• Availability: The onsemi SN74LS90D has significantly higher inventory (19,280 pcs) compared to the Texas Instruments variant (702 pcs).
• Compliance Status: The Texas Instruments SN74LS90DG4 is ROHS3 compliant. The onsemi SN74LS90D is RoHS non-compliant. Applications requiring RoHS compliance must use the Texas Instruments part.
• Product Status: Both parts are discontinued or obsolete, indicating limited future availability. Long-term sourcing strategies should be evaluated.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS90D replace the SN74LS90DG4 in all applications?

A: Yes, the SN74LS90D is electrically and mechanically equivalent. Both devices have identical logic type, bit width, count rate, supply voltage, operating temperature range, and 14-SOIC package configuration. Pin-for-pin compatibility is confirmed.

Q: What is the difference between these two parts?

A: The primary differences are manufacturer (Texas Instruments vs. onsemi), product status (discontinued vs. obsolete), RoHS compliance status (ROHS3 compliant vs. non-compliant), and current inventory levels. Functional specifications are identical.

Q: Are there any package differences?

A: No. Both parts use the 14-SOIC (0.154", 3.90mm Width) package. PCB layout and footprint compatibility is confirmed.

Q: Which part should I select for new designs?

A: Selection depends on compliance requirements. For RoHS-compliant applications, use the Texas Instruments SN74LS90DG4. For applications without RoHS requirements, the onsemi SN74LS90D offers higher availability. Both parts are discontinued or obsolete; alternative modern counter ICs should be evaluated for long-term product viability.

Q: What is the count rate specification?

A: Both parts support a maximum count rate of 42 MHz with negative edge triggering. This specification applies to decade counting operations with asynchronous reset.