MM74HC374MTCX Equivalent & Substitute Parts

Part Overview

The MM74HC374MTCX is a D-type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 8-bit positive edge triggering in a 20-TSSOP surface mount package. This part is classified as a standard logic component with tri-state, non-inverted output configuration. The device operates across a 2V to 6V supply voltage range with a maximum clock frequency of 35 MHz and propagation delay of 40ns at 6V with 150pF load. The part maintains active product status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). Equivalent and substitute parts are necessary when addressing supply chain constraints, inventory availability, or when design specifications permit operation within alternative electrical or thermal parameters.

Key Parameters

Parameter	Value
Manufacturer Part Number	MM74HC374MTCX
Manufacturer	onsemi
Base Product Number	74HC374
Type	D-Type Flip Flop, 1 Element, 8 Bit
Output Type	Tri-State, Non-Inverted
Clock Frequency	35 MHz
Max Propagation Delay	40ns @ 6V, 150pF
Voltage Supply Range	2V ~ 6V
Quiescent Current	8 µA
Output Current (High/Low)	7.8mA / 7.8mA
Package	20-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the MM74HC374MTCX is determined by the following critical parameters: base product number (74HC374 or 74HC574 variants), logic function (D-type flip-flop with 8-bit configuration), output type (tri-state, non-inverted), package type (20-TSSOP or compatible 20-SSOP), and supply voltage compatibility (2V ~ 6V range). Parts are grouped into three categories:

Direct Equivalents (Same Base Number 74HC374, 20-TSSOP Package): Parts that maintain identical functional specifications and package footprint, differing only in manufacturer or minor electrical characteristics within acceptable tolerances.

Similar Substitutes (Same Base Number 74HC374, Different Packaging or Electrical Characteristics): Parts sharing the same logic function and base number but with variations in propagation delay, quiescent current, or package dimensions (20-SSOP vs. 20-TSSOP).

Parametric Equivalents (Base Number 74HC574, Same Package): Parts with functionally equivalent D-type flip-flop architecture in the same 20-TSSOP package but different internal latch configuration, suitable when design permits output latch timing variations.

Parameter Comparison

Part Number	Manufacturer	Base Number	Clock Freq (MHz)	Prop Delay (ns)	Iq (µA)	Temp Range (°C)	Package	Status	Inventory
MM74HC374MTCX	onsemi	74HC374	35	40 @ 6V, 150pF	8	-40 ~ 85	20-TSSOP	Active	12,700
MC74HC374ADTR2G	onsemi	74HC374	35	21 @ 6V, 50pF	4	-55 ~ 125	20-TSSOP	Active	4,820
NLV74HC374ADTR2G	onsemi	74HC374	35	21 @ 6V, 50pF	4	-55 ~ 125	20-TSSOP	Obsolete	3,118
MM74HC574MTCX	onsemi	74HC574	35	27 @ 6V, 150pF	8	-40 ~ 85	20-TSSOP	Active	9,784
SN74HC374PWR	Texas Instruments	74HC374	70	31 @ 6V, 50pF	8	-40 ~ 85	20-TSSOP	Active	65,200
SN74HC374PWT	Texas Instruments	74HC374	70	31 @ 6V, 50pF	8	-40 ~ 85	20-TSSOP	Discontinued	1,107
74HC374PW,118	Nexperia USA Inc.	74HC374	83	28 @ 6V, 50pF	4	-40 ~ 125	20-TSSOP	Active	1,369
MC74HC374ADTG	onsemi	74HC374	35	21 @ 6V, 50pF	4	-55 ~ 125	20-TSSOP	Obsolete	1,106
SN74HC374APWR	Texas Instruments	74HC374	70	31 @ 6V, 50pF	8	-40 ~ 85	20-TSSOP	Active	3,400
SN74HC374DBR	Texas Instruments	74HC374	70	31 @ 6V, 50pF	8	-40 ~ 85	20-SSOP	Active	1,900
NLV74HC574ADTR2G	onsemi	74HC574	35	27 @ 6V, 50pF	4	-55 ~ 125	20-TSSOP	Obsolete	3,623

Engineering Selection Recommendations

For Direct Pin-Compatible Replacement (20-TSSOP Package, 74HC374 Base):

SN74HC374PWR (Texas Instruments) is the primary recommendation for active production designs. This part maintains identical package footprint and logic function with higher clock frequency (70 MHz vs. 35 MHz), lower propagation delay (31ns vs. 40ns), and superior inventory availability (65,200 units). Both parts operate within the same temperature range (-40°C ~ 85°C) and supply voltage (2V ~ 6V), with ROHS3 compliance and MSL 1 rating.

SN74HC374APWR (Texas Instruments) provides equivalent electrical performance to SN74HC374PWR with active product status and 3,400 units in stock.

74HC374PW,118 (Nexperia USA Inc.) offers the highest clock frequency (83 MHz) and extended temperature range (-40°C ~ 125°C) with active status, suitable for applications requiring enhanced thermal performance.

MC74HC374ADTR2G (onsemi) delivers improved propagation delay (21ns vs. 40ns) and lower quiescent current (4 µA vs. 8 µA) with extended temperature range (-55°C ~ 125°C), appropriate for power-sensitive or high-speed applications.

For Parametric Equivalence (74HC574 Base, Same Package):

MM74HC574MTCX and NLV74HC574ADTR2G provide functionally equivalent D-type flip-flop operation with different latch timing characteristics. These parts are suitable only when design specifications explicitly permit 74HC574 architecture substitution.

Package Consideration:

SN74HC374DBR uses 20-SSOP package (0.209", 5.30mm width) instead of 20-TSSOP (0.173", 4.40mm width). This part is not suitable for direct PCB replacement without layout modification.

Obsolete Parts:

NLV74HC374ADTR2G, MC74HC374ADTG, and NLV74HC574ADTR2G carry obsolete product status and should not be selected for new designs despite available inventory.

Frequently Asked Questions (FAQ)

Q: Can SN74HC374PWR directly replace MM74HC374MTCX on the PCB?

A: Yes. Both parts use identical 20-TSSOP package footprint (0.173", 4.40mm width), pin configuration, and logic function. Electrical parameters are compatible within the specified 2V ~ 6V supply range and -40°C ~ 85°C operating temperature.

Q: What is the difference between 74HC374 and 74HC574 base numbers?

A: Both are D-type flip-flops with 8-bit configuration and tri-state output. The 74HC574 has different internal latch timing and propagation delay characteristics (27ns vs. 40ns at specified load). Substitution between these base numbers requires design verification that output timing variations are acceptable.

Q: Why does SN74HC374PWR have higher clock frequency (70 MHz) than MM74HC374MTCX (35 MHz)?

A: Clock frequency specification reflects the maximum operating frequency under specified conditions. Texas Instruments SN74HC374PWR is rated for higher frequency operation, but both parts function correctly at lower frequencies. The MM74HC374MTCX will operate reliably at 70 MHz if thermal and electrical margins are maintained.

Q: Is the 20-SSOP package (SN74HC374DBR) compatible with 20-TSSOP designs?

A: No. The 20-SSOP package is physically larger (0.209" vs. 0.173" width) and requires different PCB footprint. Direct substitution is not possible without layout redesign.

Q: What does "Obsolete" product status mean for NLV74HC374ADTR2G?

A: Obsolete status indicates the manufacturer has discontinued production. While inventory may be available, these parts should not be selected for new designs due to future supply uncertainty and lack of manufacturer support.

Q: Can I use 74HC374PW,118 in a design with -40°C ~ 85°C temperature requirement?

A: Yes. The 74HC374PW,118 is rated for -40°C ~ 125°C, which exceeds the -40°C ~ 85°C requirement. The part will function correctly within the narrower temperature range.

Q: What is the significance of quiescent current differences (4 µA vs. 8 µA)?

A: Quiescent current represents power consumption when the device is not switching. Lower quiescent current (4 µA in MC74HC374ADTR2G) reduces standby power consumption, beneficial for battery-powered or low-power applications. Higher quiescent current (8 µA in MM74HC374MTCX) has minimal impact in typical powered applications.

Q: Are all listed parts ROHS3 compliant?

A: Yes. All parts in this reference carry ROHS3 compliance status and MSL 1 (unlimited moisture sensitivity level), meeting environmental and reliability standards for industrial and commercial applications.

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