CD74HC173NSR Equivalent & Substitute Parts

Part Overview

The CD74HC173NSR is a D-Type flip-flop logic integrated circuit manufactured by Texas Instruments, designed for 4-bit parallel data storage with master reset functionality. This component operates across a 2V to 6V supply range and features tri-state, non-inverted outputs. The part is currently classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. Substitute parts must maintain functional compatibility while meeting the same electrical and mechanical specifications required for direct board-level replacement.

Substiute Parts

CD74HC173NSR

Texas InstrumentsIn Stock: 1159CD74HC173NSR Datasheet

Current PartRFQ

74HC173D,653

NXP SemiconductorsIn Stock: 1709574HC173D,653 Datasheet

MFR RecommendedRFQ

MC74HC175ADG

onsemiIn Stock: 1770MC74HC175ADG Datasheet

MFR RecommendedRFQ

MC74HC175ADR2G

onsemiIn Stock: 1240MC74HC175ADR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CD74HC173NSR is determined by the following critical parameters:

Primary Compatibility Criteria:

• D-Type flip-flop architecture with 4-bit configuration
• Positive edge trigger mechanism
• Master reset function
• 16-pin SOIC package footprint
• Surface mount technology
• 2V to 6V supply voltage compatibility
• Operating temperature range of -55°C to 125°C or wider

Acceptable Variations:

• Clock frequency may exceed the original specification (higher performance acceptable)
• Propagation delay may be lower than the original specification (faster operation acceptable)
• Quiescent current may be lower than the original specification (reduced power consumption acceptable)
• Output type variations (tri-state non-inverted vs. complementary) are functionally distinct but both acceptable for logic applications
• Package width variations within 16-SOIC standard (0.154" to 0.209") are compatible with standard PCB footprints

The substitute parts 74HC173D,653 (NXP Semiconductors), MC74HC175ADG (onsemi), and MC74HC175ADR2G (onsemi) meet these criteria and are classified as active products with current manufacturing availability.

Parameter Comparison

Engineering Selection Recommendations

74HC173D,653 (NXP Semiconductors) is the primary recommended substitute. This part maintains identical output type (tri-state, non-inverted), matching output current specifications (7.8 mA), and equivalent supply voltage range. The NXP variant demonstrates improved performance with 95 MHz clock frequency and 30 ns propagation delay, both superior to the original specification. The part is classified as active with substantial inventory availability. Operating temperature range is -40°C to 125°C, which covers the majority of industrial applications, though it does not extend to the full -55°C lower limit of the original part.

MC74HC175ADG and MC74HC175ADR2G (onsemi) are secondary substitutes suitable for applications where complementary output type is functionally acceptable. Both onsemi variants are active products with ROHS3 compliance and full -55°C to 125°C operating temperature range. These parts feature lower quiescent current (4 µA vs. 8 µA) and reduced output current (5.2 mA vs. 7.8 mA), making them suitable for power-constrained designs. The MC74HC175ADR2G is supplied in tape and reel packaging, while MC74HC175ADG is supplied in tube packaging. Clock frequency is 35 MHz, which is lower than the original specification but sufficient for most standard logic applications.

Selection between these substitutes depends on specific application requirements regarding output type, temperature range, and packaging format.

Frequently Asked Questions (FAQ)

Q: Can the 74HC173D,653 directly replace the CD74HC173NSR on existing PCBs?

A: The 74HC173D,653 is mechanically compatible with standard 16-SOIC footprints. However, the package width differs (0.154" vs. 0.209"), which may require PCB footprint adjustment. Electrical compatibility is confirmed across all critical parameters including supply voltage, output type, and trigger mechanism.

Q: What is the functional difference between tri-state non-inverted and complementary output types?

A: Tri-state non-inverted outputs (CD74HC173NSR, 74HC173D,653) provide standard logic levels with high-impedance state capability. Complementary outputs (MC74HC175ADG, MC74HC175ADR2G) provide both true and inverted signal paths. Application requirements determine which output type is appropriate.

Q: Is the 74HC173D,653 suitable for applications requiring -55°C operation?

A: The 74HC173D,653 operates from -40°C to 125°C. Applications requiring -55°C minimum temperature must use MC74HC175ADG or MC74HC175ADR2G, which support the full -55°C to 125°C range.

Q: What are the packaging differences among the substitute parts?

A: 74HC173D,653 is supplied in bulk packaging. MC74HC175ADG is supplied in tube packaging. MC74HC175ADR2G is supplied in tape and reel format. All three are 16-SOIC surface mount packages compatible with automated assembly processes.

Q: Are all substitute parts ROHS3 compliant?

A: The 74HC173D,653 compliance status is not specified in available documentation. MC74HC175ADG and MC74HC175ADR2G are confirmed ROHS3 compliant. Applications requiring ROHS3 certification should specify onsemi variants.

Q: How do the quiescent current specifications affect power consumption?

A: The CD74HC173NSR draws 8 µA quiescent current, while all substitute parts draw 4 µA. This 50% reduction in standby current consumption may be significant in battery-powered or low-power applications. Output current capability also differs: the original and NXP parts provide 7.8 mA, while onsemi parts provide 5.2 mA.

Q: Can multiple substitute parts be used interchangeably within the same design?

A: No. The tri-state non-inverted output type (74HC173D,653) and complementary output type (onsemi variants) are functionally distinct. A single design must standardize on one output type. Mixing output types within a circuit requires separate signal conditioning logic.