MM74HC174SJX Equivalent & Substitute Parts

Part Overview

The MM74HC174SJX 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 listed as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Base Product Number	74HC174
Function	Master Reset
Type	D-Type
Output Type	Non-Inverted
Number of Elements	1
Number of Bits per Element	6
Trigger Type	Positive Edge
Voltage Supply Range	2V ~ 6V
Current Output High/Low	5.2mA / 5.2mA
Current Quiescent (Iq)	8 µA
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	16-SOIC
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MM74HC174SJX is determined by strict adherence to the following core parameters:

Critical Matching Parameters:

Base product number: 74HC174
Function: Master Reset
Type: D-Type flip-flop
Output type: Non-Inverted
Number of elements: 1
Number of bits per element: 6
Trigger type: Positive Edge
Voltage supply range: 2V ~ 6V
Current output specifications: 5.2mA / 5.2mA
Quiescent current: 8 µA
Mounting type: Surface Mount
Package family: 16-SOIC

All substitute parts listed maintain these core electrical and functional characteristics. Package width variations (0.154" vs 0.209") are noted but do not prevent substitution when PCB layout accommodates the physical dimensions.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Clock Frequency	Max Propagation Delay @ 6V, 50pF	Input Capacitance	Operating Temperature	Package Width	Product Status
MM74HC174SJX	onsemi	31 MHz	28ns	5 pF	-40°C ~ 85°C	0.209" (5.30mm)	Obsolete
74HC174D,653	NXP Semiconductors	107 MHz	28ns	4.6 pF	-40°C ~ 125°C	0.154" (3.90mm)	Active
CD74HC174M	Harris Corporation	35 MHz	28ns	10 pF	-55°C ~ 125°C	0.154" (3.90mm)	Obsolete
CD74HC174M96	Harris Corporation	35 MHz	28ns	10 pF	-55°C ~ 125°C	0.154" (3.90mm)	Obsolete
SN74HC174D	Texas Instruments	50 MHz	14ns	3 pF	-40°C ~ 85°C	0.154" (3.90mm)	Discontinued at DiGi Electronics
SN74HC174DR	Texas Instruments	50 MHz	14ns	3 pF	-40°C ~ 85°C	0.154" (3.90mm)	Active
SN74HC174DRG4	Texas Instruments	50 MHz	27ns	3 pF	-40°C ~ 85°C	0.154" (3.90mm)	Discontinued at DiGi Electronics
SN74HC174NSR	Texas Instruments	50 MHz	27ns	3 pF	-40°C ~ 85°C	0.209" (5.30mm)	Active

Engineering Selection Recommendations

Primary Recommendation: SN74HC174DR (Texas Instruments)

The SN74HC174DR is the preferred substitute for the MM74HC174SJX. This part is currently active in production, carries ROHS3 compliance certification, and maintains REACH unaffected status. The propagation delay of 14ns at 6V with 50pF load meets or exceeds the original specification of 28ns, providing improved timing performance. The part is available in Cut Tape and Digi-Reel packaging formats with substantial inventory (3407 units).

Alternative Recommendation: 74HC174D,653 (NXP Semiconductors)

The 74HC174D,653 from NXP Semiconductors offers the highest clock frequency specification (107 MHz) among all substitutes and is currently active in production. This part provides superior performance headroom and is available in bulk packaging with the largest inventory (35059 units). The operating temperature range extends to 125°C, providing broader environmental coverage than the original part.

Secondary Recommendation: SN74HC174NSR (Texas Instruments)

The SN74HC174NSR maintains the same 0.209" package width as the original MM74HC174SJX, eliminating potential PCB layout modifications. This part is active in production with ROHS3 compliance and REACH unaffected status. The 27ns propagation delay closely matches the original specification.

Not Recommended for New Designs:

Parts with obsolete status (CD74HC174M, CD74HC174M96) or discontinued status (SN74HC174D, SN74HC174DRG4) should not be selected for new designs despite functional equivalence. These parts present long-term supply chain risk and may not meet current compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can I use any 74HC174 variant as a direct replacement for the MM74HC174SJX?

A: All listed substitute parts share the same base product number (74HC174) and maintain identical core electrical specifications: D-type flip-flop function, 6-bit configuration, positive edge triggering, 2V-6V supply range, and 5.2mA output current. Substitution is electrically valid. Physical package width differences (0.154" vs 0.209") must be verified against PCB layout constraints.

Q: What is the difference between the 0.154" and 0.209" package widths?

A: Both are 16-SOIC packages but with different body widths. The 0.209" width (MM74HC174SJX, SN74HC174NSR) is the older standard. The 0.154" width (most NXP and newer Texas Instruments variants) is the modern standard. PCB footprints must accommodate the specific width. Consult PCB design files to determine compatibility.

Q: Why do propagation delays vary between substitutes?

A: Propagation delay specifications reflect manufacturing process differences between semiconductor vendors. The MM74HC174SJX specifies 28ns maximum delay. Substitutes ranging from 14ns to 28ns all meet or exceed this specification. Faster propagation delays (14ns) provide additional timing margin in synchronous circuits.

Q: Are all substitutes RoHS compliant?

A: Texas Instruments parts (SN74HC174DR, SN74HC174DRG4, SN74HC174NSR) carry ROHS3 compliance certification. NXP's 74HC174D,653 does not specify RoHS status in provided data. Harris Corporation parts (CD74HC174M, CD74HC174M96) are explicitly RoHS non-compliant. Verify RoHS requirements for your application before selection.

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

A: The SN74HC174DR (Texas Instruments) and 74HC174D,653 (NXP Semiconductors) are both active in production with substantial inventory levels (3407 and 35059 units respectively). These parts represent the lowest supply chain risk for new designs and ongoing procurement.

Q: Can I mix different manufacturers' parts in the same design?

A: Yes. All substitutes maintain identical functional specifications and electrical characteristics. Mixing manufacturers is acceptable from an engineering standpoint. However, maintain consistent sourcing within production batches to ensure consistent performance characteristics and compliance certifications.

Q: What is the significance of the MSL (Moisture Sensitivity Level) rating?

A: MSL 1 (Unlimited) indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. All listed parts carry MSL 1 rating, eliminating moisture management as a selection factor.

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