MM74HC174MX Equivalent & Substitute Parts

Part Overview

The MM74HC174MX is a D-type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 6 bits per element in a 16-SOIC package. This component functions as a master reset flip-flop with positive edge triggering and non-inverted outputs. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain functional equivalence across core electrical parameters including supply voltage range, output characteristics, and trigger behavior while accommodating variations in propagation delay, clock frequency, and operating temperature ranges.

Key Parameters

Parameter	MM74HC174MX
Manufacturer	onsemi
Series	74HC
Type	D-Type Flip-Flop
Number of Elements	1
Number of Bits per Element	6
Output Type	Non-Inverted
Trigger Type	Positive Edge
Package / Case	16-SOIC (0.154", 3.90mm Width)
Voltage - Supply	2V ~ 6V
Current - Output High, Low	5.2mA, 5.2mA
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the MM74HC174MX are classified based on functional and electrical compatibility within the 74HC174 logic family. The core substitution criteria are:

Critical Parameters (Must Match):

D-Type flip-flop architecture with 1 element, 6 bits per element
Non-inverted output configuration
Positive edge trigger mechanism
16-SOIC package form factor (0.154", 3.90mm Width)
Supply voltage range: 2V ~ 6V
Output current capability: 5.2mA (high and low)
Surface mount mounting type

Variable Parameters (Acceptable Variation):

Clock frequency (31 MHz to 107 MHz)
Propagation delay (14ns to 28ns @ 6V, 50pF)
Quiescent current (4 µA to 8 µA)
Input capacitance (3 pF to 10 pF)
Operating temperature range (extended ranges acceptable)
Product status (active preferred over obsolete)
RoHS compliance and packaging format

Substitutes are grouped as direct replacements (MC74HC174ADR2G), similar alternatives (NLV74HC174ADR2G, CD74HC174M96, MC74HC174ADG, SN74HC174D, SN74HC174DR, SN74HC174DRG4, SN74HC174NSR), and upgrades (74HC174D,653, CD74HC174M) based on performance characteristics and availability status.

Parameter Comparison

Parameter	MM74HC174MX	MC74HC174ADR2G	NLV74HC174ADR2G	CD74HC174M96	74HC174D,653	CD74HC174M	MC74HC174ADG	SN74HC174D	SN74HC174DR	SN74HC174DRG4	SN74HC174NSR
Manufacturer	onsemi	onsemi	onsemi	Harris	NXP	Harris	onsemi	TI	TI	TI	TI
Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type
Number of Bits	6	6	6	6	6	6	6	6	6	6	6
Output Type	Non-Inverted	Non-Inverted	Non-Inverted	Non-Inverted	Non-Inverted	Non-Inverted	Non-Inverted	Non-Inverted	Non-Inverted	Non-Inverted	Non-Inverted
Trigger Type	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge
Package / Case	16-SOIC (0.154", 3.90mm)	16-SOIC (0.154", 3.90mm)	16-SOIC (0.154", 3.90mm)	16-SOIC (0.154", 3.90mm)	16-SOIC (0.154", 3.90mm)	16-SOIC (0.154", 3.90mm)	16-SOIC (0.154", 3.90mm)	16-SOIC (0.154", 3.90mm)	16-SOIC (0.154", 3.90mm)	16-SOIC (0.154", 3.90mm)	16-SOIC (0.209", 5.30mm)
Voltage - Supply	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V
Current - Output High, Low	5.2mA, 5.2mA	5.2mA, 5.2mA	5.2mA, 5.2mA	5.2mA, 5.2mA	5.2mA, 5.2mA	5.2mA, 5.2mA	5.2mA, 5.2mA	5.2mA, 5.2mA	5.2mA, 5.2mA	5.2mA, 5.2mA	5.2mA, 5.2mA
Clock Frequency	31 MHz	35 MHz	35 MHz	35 MHz	107 MHz	35 MHz	35 MHz	50 MHz	50 MHz	50 MHz	50 MHz
Max Propagation Delay @ 6V, 50pF	28ns	19ns	27ns	28ns	28ns	28ns	19ns	14ns	14ns	27ns	27ns
Current - Quiescent (Iq)	8 µA	4 µA	4 µA	8 µA	8 µA	8 µA	4 µA	8 µA	8 µA	8 µA	8 µA
Input Capacitance	5 pF	10 pF	10 pF	10 pF	4.6 pF	10 pF	10 pF	3 pF	3 pF	3 pF	3 pF
Operating Temperature	-40°C ~ 85°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Product Status	Obsolete	Active	Obsolete	Obsolete	Active	Obsolete	Obsolete	Discontinued	Active	Discontinued	Active
RoHS Status	REACH Unaffected	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	REACH Unaffected	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: MC74HC174ADR2G

MC74HC174ADR2G is the direct substitute for MM74HC174MX. It maintains identical functional specifications, package form factor, and electrical characteristics while offering active product status and ROHS3 compliance. This part is available in Tape & Reel packaging with 10,300 units in stock, providing supply continuity. The improved propagation delay (19ns versus 28ns) and lower quiescent current (4 µA versus 8 µA) represent performance enhancements without functional deviation.

Secondary Recommendation: SN74HC174DR

SN74HC174DR from Texas Instruments is an active product with ROHS3 compliance and 3,407 units in stock. It provides equivalent functionality with improved propagation delay (14ns) and lower input capacitance (3 pF). Operating temperature range matches the original part (-40°C ~ 85°C). This part is available in Cut Tape and Digi-Reel packaging formats.

Alternative Recommendation: 74HC174D,653

74HC174D,653 from NXP Semiconductors is an active product offering the highest clock frequency (107 MHz) and lowest input capacitance (4.6 pF) among available substitutes. Extended operating temperature range (-40°C ~ 125°C) provides broader application flexibility. With 35,059 units in stock, this part ensures long-term availability. Bulk packaging format requires consideration for production workflows.

Compatibility Note: SN74HC174NSR

SN74HC174NSR differs in package width (0.209", 5.30mm versus 0.154", 3.90mm). While functionally equivalent and active with ROHS3 compliance, PCB layout modifications are required for this part. Use only when primary recommendations are unavailable and board redesign is acceptable.

Obsolete Parts: NLV74HC174ADR2G, CD74HC174M96, CD74HC174M, MC74HC174ADG

These parts are obsolete or discontinued. While electrically compatible, they present supply chain risk. Selection should occur only when active alternatives are exhausted and existing inventory is confirmed available.

Frequently Asked Questions (FAQ)

Q: Can MC74HC174ADR2G directly replace MM74HC174MX without circuit modification?

A: Yes. MC74HC174ADR2G maintains identical pin configuration, package dimensions (16-SOIC, 0.154", 3.90mm), supply voltage range (2V ~ 6V), output current (5.2mA), and trigger behavior (positive edge, non-inverted). No circuit modifications are required.

Q: What is the difference between propagation delay specifications across substitute parts?

A: Propagation delay varies from 14ns (SN74HC174D, SN74HC174DR) to 28ns (MM74HC174MX, CD74HC174M96, 74HC174D,653, CD74HC174M). Lower propagation delay indicates faster signal transition. All values remain within acceptable timing margins for standard 74HC logic applications. Verify timing requirements against specific circuit design specifications.

Q: Are all substitute parts RoHS compliant?

A: No. MC74HC174ADR2G, NLV74HC174ADR2G, MC74HC174ADG, SN74HC174D, SN74HC174DR, SN74HC174DRG4, and SN74HC174NSR are ROHS3 compliant. CD74HC174M96 and CD74HC174M are RoHS non-compliant. 74HC174D,653 has REACH Unaffected status. Verify compliance requirements for your application before selection.

Q: Which substitute offers the best long-term availability?

A: 74HC174D,653 from NXP Semiconductors is recommended for long-term availability, with 35,059 units in stock and active product status. MC74HC174ADR2G (10,300 units, active) and SN74HC174DR (3,407 units, active) are secondary options.

Q: Can SN74HC174NSR be used as a substitute despite different package width?

A: SN74HC174NSR has a different package width (0.209", 5.30mm versus 0.154", 3.90mm). While functionally equivalent, this requires PCB layout modifications and potential board redesign. Use only when primary recommendations are unavailable and design changes are acceptable.

Q: What is the operating temperature range difference between MM74HC174MX and substitute parts?

A: MM74HC174MX operates -40°C ~ 85°C. MC74HC174ADR2G, NLV74HC174ADR2G, CD74HC174M96, CD74HC174M, and MC74HC174ADG extend to -55°C ~ 125°C. 74HC174D,653 operates -40°C ~ 125°C. SN74HC174D, SN74HC174DR, SN74HC174DRG4, and SN74HC174NSR match the original range (-40°C ~ 85°C). Select based on thermal environment requirements.

Q: How do quiescent current differences affect circuit design?

A: MM74HC174MX draws 8 µA quiescent current. MC74HC174ADR2G, NLV74HC174ADR2G, and MC74HC174ADG reduce this to 4 µA, lowering standby power consumption. All other substitutes maintain 8 µA. For battery-powered or low-power applications, lower quiescent current parts provide efficiency benefits.

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