CD74HC93M Binary Counter 4-Bit Logic IC Equivalent & Substitute Parts

Part Overview

The CD74HC93M is a 4-bit binary counter logic IC manufactured by Texas Instruments in a 14-SOIC surface mount package. This component functions as a negative edge-triggered counter with asynchronous reset capability, designed for digital counting and frequency division applications. The part is currently discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and production requirements. With 917 units in current inventory, alternative sources and compatible replacements are essential for long-term component availability.

Substiute Parts

CD74HC93M

Texas InstrumentsIn Stock: 1006CD74HC93M Datasheet

Current PartRFQ

CD74HC93M96

Harris CorporationIn Stock: 2911CD74HC93M96 Datasheet

DirectRFQ

74HCT273D,653

NXP SemiconductorsIn Stock: 30030174HCT273D,653 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the CD74HC93M is determined by the following critical parameters: logic function type (binary counter), bit width (4-bit), trigger mechanism (negative edge), reset configuration (asynchronous), supply voltage range (2 V ~ 6 V), maximum count rate (35 MHz), package form factor (14-SOIC), and mounting technology (surface mount).

The CD74HC93M96 qualifies as a direct equivalent substitute based on identical specifications across all functional and electrical parameters. This part maintains the same 74HC series designation, 4-bit counter architecture, negative edge triggering, asynchronous reset, 35 MHz count rate, 2 V ~ 6 V supply voltage, and 14-SOIC package configuration. The primary distinction is manufacturer origin (Harris Corporation versus Texas Instruments) and packaging format (bulk versus tube).

The 74HCT273D,653 represents a functional alternative within the 74-series logic family but operates under different electrical constraints and implements a different logic function (D-type flip-flop with 8-bit configuration rather than 4-bit binary counter). This part is included in the substitute list but requires design-level evaluation due to functional and electrical parameter differences.

Parameter Comparison

Engineering Selection Recommendations

For applications requiring direct pin-for-pin and functional compatibility, the CD74HC93M96 is the primary substitute. This part maintains identical electrical specifications, package configuration, and logic function. However, the CD74HC93M96 carries RoHS non-compliant status, which may present regulatory constraints in applications subject to RoHS3 requirements. The CD74HC93M96 is classified as obsolete, requiring verification of long-term availability through component distributors.

The 74HCT273D,653 is an active product with substantial inventory availability (300,200 units), but substitution requires circuit redesign. This part implements D-type flip-flop logic rather than binary counter function, operates on a narrower supply voltage range (4.5V ~ 5.5V versus 2 V ~ 6 V), uses positive edge triggering instead of negative edge, and requires a larger 20-SOIC package footprint. The 74HCT273D,653 is suitable only for applications where the counter function can be replaced with flip-flop logic and where the electrical parameter differences are acceptable.

For new designs or applications requiring RoHS3 compliance and extended availability, evaluation of alternative 4-bit binary counter architectures from active product lines is recommended.

Frequently Asked Questions (FAQ)

Q: Can the CD74HC93M96 be used as a direct replacement for the CD74HC93M?

A: Yes, the CD74HC93M96 provides direct functional and electrical equivalence. Both parts implement 4-bit binary counter logic with negative edge triggering, asynchronous reset, 35 MHz count rate, 2 V ~ 6 V supply voltage, and identical 14-SOIC package configuration. The primary considerations are manufacturer origin (Harris Corporation versus Texas Instruments) and RoHS compliance status (non-compliant versus ROHS3 compliant).

Q: Is the 74HCT273D,653 compatible with the CD74HC93M?

A: The 74HCT273D,653 is not a direct replacement. While both are 74-series logic components, they implement different functions: the CD74HC93M is a 4-bit binary counter, while the 74HCT273D,653 is an 8-bit D-type flip-flop. Additionally, the 74HCT273D,653 operates on a restricted supply voltage range (4.5V ~ 5.5V), uses positive edge triggering, and requires a larger package footprint (20-SOIC). Substitution requires circuit redesign and is only viable if the application logic can accommodate flip-flop functionality.

Q: What are the package differences between these parts?

A: The CD74HC93M and CD74HC93M96 both use 14-SOIC (0.154", 3.90mm width) surface mount packages with identical pin configurations. The 74HCT273D,653 uses a larger 20-SOIC (0.295", 7.50mm width) package, requiring PCB layout modifications and cannot be used as a pin-compatible substitute.

Q: Are there supply voltage compatibility concerns?

A: The CD74HC93M operates across 2 V ~ 6 V, providing broad supply voltage flexibility. The CD74HC93M96 maintains this same range. The 74HCT273D,653 operates only within 4.5V ~ 5.5V, a narrower range that may not be compatible with applications designed for the full 2 V ~ 6 V operating window of the CD74HC93M.

Q: What is the significance of the trigger type difference?

A: The CD74HC93M and CD74HC93M96 both use negative edge triggering, meaning the counter increments on the falling edge of the clock signal. The 74HCT273D,653 uses positive edge triggering, incrementing on the rising edge. This fundamental difference in timing behavior prevents direct substitution without circuit modification.