MM74HC393MX Binary Counter IC Equivalent & Substitute Parts

Part Overview

The MM74HC393MX is a dual 4-bit binary counter IC manufactured by onsemi, housed in a 14-SOIC surface mount package. This logic component features two independent 4-bit counters with asynchronous reset, negative edge triggering, and a maximum count rate of 50 MHz. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Base Product Number	74HC393
Logic Type	Binary Counter
Number of Elements	2
Number of Bits per Element	4
Direction	Up
Reset Type	Asynchronous
Trigger Type	Negative Edge
Count Rate	50 MHz
Voltage Supply Range	2 V ~ 6 V
Operating Temperature Range	-40°C ~ 85°C
Package Type	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MM74HC393MX is determined by strict equivalence across the following critical parameters:

Base product number (74HC393 series)
Logic type (Binary Counter)
Number of elements (2) and bits per element (4)
Counter direction (Up) and reset type (Asynchronous)
Trigger type (Negative Edge)
Voltage supply range (2 V ~ 6 V minimum)
Package type (14-SOIC or 14-SO)
Mounting type (Surface Mount)

Substitute parts must maintain identical functional specifications. Count rate, operating temperature range, and product status may vary within acceptable limits. Packaging format (tube, tape & reel, cut tape) does not affect electrical equivalence but impacts procurement and handling.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Count Rate (MHz)	Operating Temperature (°C)	Product Status	Packaging	Package Type	RoHS Status
MM74HC393MX	onsemi	50	-40 ~ 85	Obsolete	—	14-SOIC	—
MC74HC393ADG	onsemi	50	-55 ~ 125	Active	Tube	14-SOIC	ROHS3 Compliant
MC74HC393ADR2G	onsemi	50	-55 ~ 125	Active	Tape & Reel	14-SOIC	ROHS3 Compliant
SN74HC393D	Texas Instruments	36	-40 ~ 85	Discontinued at DiGi Electronics	Tube	14-SOIC	ROHS3 Compliant
SN74HC393DR	Texas Instruments	36	-40 ~ 85	Active	Cut Tape & Digi-Reel	14-SOIC	ROHS3 Compliant
SN74HC393DT	Texas Instruments	36	-40 ~ 85	Discontinued at DiGi Electronics	Tape & Reel	14-SOIC	ROHS3 Compliant
74HC393D,652	Nexperia USA Inc.	107	-40 ~ 125	Obsolete	Tube	14-SOIC	ROHS3 Compliant
74HC393D,653	Nexperia USA Inc.	107	-40 ~ 125	Active	Tape & Reel	14-SOIC	ROHS3 Compliant
CD74HC393M96	Texas Instruments	35	-55 ~ 125	Active	Cut Tape & Digi-Reel	14-SOIC	ROHS3 Compliant
CD74HC393MT	Texas Instruments	35	-55 ~ 125	Discontinued at DiGi Electronics	Tape & Reel	14-SOIC	ROHS3 Compliant
SN74HC393NSR	Texas Instruments	36	-40 ~ 85	Active	Tape & Reel	14-SO	ROHS3 Compliant

Engineering Selection Recommendations

For replacement of the obsolete MM74HC393MX, the following active status parts are recommended based on product availability and compliance:

Primary Recommendations (onsemi sourced):

MC74HC393ADG (tube packaging) or MC74HC393ADR2G (tape & reel) provide direct functional equivalence with extended operating temperature range (-55°C ~ 125°C) and ROHS3 compliance. Both maintain the 50 MHz count rate specification.

Alternative Recommendations (Texas Instruments sourced):

SN74HC393DR (active status, cut tape & Digi-Reel) offers ROHS3 compliance with 36 MHz count rate and -40°C ~ 85°C operating range, matching the original temperature specification.
CD74HC393M96 (active status, cut tape & Digi-Reel) provides extended temperature range (-55°C ~ 125°C) with 35 MHz count rate and ROHS3 compliance.

Alternative Recommendations (Nexperia sourced):

74HC393D,653 (active status, tape & reel) offers the highest count rate at 107 MHz with extended temperature range (-40°C ~ 125°C) and ROHS3 compliance.

All recommended parts maintain identical logic functionality, pin configuration, and 14-SOIC package compatibility with the original MM74HC393MX.

Frequently Asked Questions (FAQ)

Q: Can I use SN74HC393NSR as a direct replacement for MM74HC393MX? A: SN74HC393NSR is functionally equivalent but uses a 14-SO package (0.209", 5.30mm width) versus the MM74HC393MX 14-SOIC package (0.154", 3.90mm width). While both are surface mount SOIC variants, the different widths may require PCB layout verification before substitution.

Q: What is the difference between MC74HC393ADG and MC74HC393ADR2G? A: Both parts are electrically identical with 50 MHz count rate and -55°C ~ 125°C operating range. The difference is packaging format: MC74HC393ADG is supplied in tube packaging, while MC74HC393ADR2G is supplied in tape & reel format. Selection depends on procurement and assembly requirements.

Q: Why do some substitute parts have lower count rates than the MM74HC393MX? A: The MM74HC393MX specifies 50 MHz maximum count rate. Texas Instruments SN74HC393 variants specify 36 MHz, and CD74HC393 variants specify 35 MHz. These represent different manufacturer specifications for the same logic function. Selection should verify that the application's timing requirements are met by the substitute part's count rate specification.

Q: Are all substitute parts ROHS3 compliant? A: All active and discontinued substitute parts listed are ROHS3 compliant. The original MM74HC393MX does not specify RoHS status in the provided data.

Q: Can I mix different manufacturers' parts in the same design? A: Yes. All listed parts implement the identical 74HC393 logic function with the same pin configuration and electrical characteristics within their specified operating ranges. Mixing manufacturers is acceptable from a functional standpoint, though design documentation should reflect the specific part number used.

Q: What should I consider when choosing between active and discontinued parts? A: Active status parts ensure long-term availability and ongoing manufacturer support. Discontinued parts may have limited remaining inventory. For new designs, prioritize active status parts such as MC74HC393ADR2G, SN74HC393DR, CD74HC393M96, or 74HC393D,653.

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