SN74HC374PWT Equivalent & Substitute Parts

Part Overview

The SN74HC374PWT is a D-type flip-flop logic integrated circuit manufactured by Texas Instruments, featuring 1 element with 8-bit positive edge triggering in a 20-TSSOP surface mount package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components that maintain functional compatibility while meeting current supply chain requirements. Substitute parts must preserve the core logic function, package form factor, and electrical operating parameters within acceptable tolerances for direct circuit board replacement.

Key Parameters

Parameter	Value
Type	D-Type Flip Flop
Number of Elements	1
Number of Bits per Element	8
Output Type	Tri-State, Non-Inverted
Trigger Type	Positive Edge
Package / Case	20-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Voltage - Supply	2V ~ 6V
Operating Temperature	-40°C ~ 85°C (TA)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following parameters: identical package type (20-TSSOP), matching logic function (D-type flip-flop, 8-bit, positive edge triggered), compatible output configuration (tri-state, non-inverted), overlapping supply voltage range (minimum 2V ~ 6V), and surface mount mounting type. Parts are grouped into three categories based on parametric equivalence and manufacturer status.

Parametric Equivalents maintain all critical electrical specifications within the original operating envelope, differing only in packaging format (tape & reel versus cut tape) or product status (active versus discontinued). These parts are direct functional replacements.

Direct Manufacturer Alternatives originate from different manufacturers but meet the core functional and package requirements. Variations in clock frequency, propagation delay, quiescent current, and input capacitance are noted but do not preclude substitution when application timing margins accommodate the differences.

Manufacturer-Recommended Alternatives represent higher-performance or enhanced-specification variants from the 74HC, 74AHC, and 74VHC logic families. These parts offer improved speed, lower power consumption, or extended temperature ranges while maintaining package compatibility and functional equivalence.

Parameter Comparison

Part Number	Manufacturer	Series	Clock Frequency (MHz)	Max Propagation Delay @ 6V, 50pF (ns)	Current - Quiescent (µA)	Voltage - Supply (V)	Operating Temperature (°C)	Product Status	Packaging
SN74HC374PWT	Texas Instruments	74HC	70	31	8	2 ~ 6	-40 ~ 85	Discontinued	Cut Tape (CT) & Digi-Reel®
SN74HC374APWR	Texas Instruments	74HC	70	31	8	2 ~ 6	-40 ~ 85	Active	Tape & Reel (TR)
SN74HC374PWR	Texas Instruments	74HC	70	31	8	2 ~ 6	-40 ~ 85	Active	Cut Tape (CT) & Digi-Reel®
MC74HC374ADTR2G	onsemi	74HC	35	21	4	2 ~ 6	-55 ~ 125	Active	Tape & Reel (TR)
MM74HC374MTCX	onsemi	74HC	35	40	8	2 ~ 6	-40 ~ 85	Active	Tape & Reel (TR)
74AHC374PW,118	Nexperia USA Inc.	74AHC	120	10.1	4	2 ~ 5.5	-40 ~ 125	Active	Tape & Reel (TR)
74AHC574PW,118	Nexperia USA Inc.	74AHC	115	10.6	4	2 ~ 5.5	-40 ~ 125	Active	Tape & Reel (TR)
74HC374PW,118	Nexperia USA Inc.	74HC	83	28	4	2 ~ 6	-40 ~ 125	Active	Tape & Reel (TR)
74VHC574MTC	Fairchild Semiconductor	74VHC	115	10.6	4	2 ~ 5.5	-40 ~ 85	Active	-
74VHC574MTCX	onsemi	74VHC	115	10.6	4	2 ~ 5.5	-40 ~ 85	Active	Tape & Reel (TR)
MC74HC374ADTG	onsemi	74HC	35	21	4	2 ~ 6	-55 ~ 125	Obsolete	-

Engineering Selection Recommendations

Tier 1 - Direct Parametric Equivalents (Preferred)

SN74HC374APWR and SN74HC374PWR are Texas Instruments parts with identical electrical specifications to the SN74HC374PWT. Both are active products with ROHS3 compliance and unlimited moisture sensitivity rating. SN74HC374PWR matches the original cut tape packaging format, while SN74HC374APWR is supplied in tape & reel format. Selection between these two depends on procurement quantity and packaging requirements.

Tier 2 - Functional Equivalents with Extended Specifications

74HC374PW,118 (Nexperia) maintains 74HC series compatibility with extended operating temperature range (-40°C to 125°C) and improved clock frequency (83 MHz). This part is suitable for applications requiring wider temperature operation. MC74HC374ADTR2G (onsemi) offers extended temperature range (-55°C to 125°C) with lower quiescent current (4 µA) and faster propagation delay (21 ns), making it appropriate for temperature-critical or power-sensitive applications.

Tier 3 - Higher-Performance Alternatives

74AHC374PW,118 and 74AHC574PW,118 (Nexperia) represent the 74AHC family with significantly improved speed (120 MHz and 115 MHz respectively) and reduced propagation delay (10.1 ns and 10.6 ns). These parts operate at 2V ~ 5.5V supply range and are suitable for high-speed applications. 74VHC574MTCX (onsemi) and 74VHC574MTC (Fairchild) provide 74VHC series performance with 115 MHz clock frequency and 10.6 ns propagation delay, also within 2V ~ 5.5V supply range.

All recommended substitutes maintain ROHS3 compliance, 20-TSSOP package compatibility, and tri-state non-inverted output configuration. Selection should account for application timing requirements, supply voltage constraints, and temperature operating envelope.

Frequently Asked Questions (FAQ)

Q: Can SN74HC374APWR directly replace SN74HC374PWT on existing circuit boards?

A: Yes. SN74HC374APWR is a parametric equivalent with identical electrical specifications, package type (20-TSSOP), and functional configuration. The only difference is packaging format (tape & reel versus cut tape). No circuit modifications are required.

Q: What is the difference between 74HC and 74AHC series parts?

A: The 74AHC series offers improved performance characteristics: higher clock frequency (120 MHz versus 70 MHz), faster propagation delay (10.1 ns versus 31 ns), and lower quiescent current (4 µA versus 8 µA). However, 74AHC parts operate at reduced maximum supply voltage (5.5V versus 6V). Both series maintain the same package and functional configuration.

Q: Are 74VHC574 parts compatible with 74HC374 designs?

A: 74VHC574 parts are functionally equivalent D-type flip-flops with 8-bit configuration and tri-state output in the same 20-TSSOP package. They operate within 2V ~ 5.5V supply range with superior speed performance (115 MHz, 10.6 ns propagation delay). Compatibility depends on application supply voltage and timing requirements. Designs operating at 6V supply voltage cannot use 74VHC parts.

Q: What does "discontinued" status mean for the SN74HC374PWT?

A: Discontinued status indicates the part is no longer manufactured or actively distributed by the original manufacturer. Existing inventory may be available from component distributors, but long-term supply is not guaranteed. Active equivalent parts should be selected for new designs or when existing stock is depleted.

Q: Can MM74HC374MTCX be used as a direct replacement?

A: MM74HC374MTCX is functionally compatible but exhibits different electrical characteristics: lower clock frequency (35 MHz versus 70 MHz) and longer propagation delay (40 ns versus 31 ns). It is suitable for applications with relaxed timing requirements. For timing-critical circuits, SN74HC374APWR or SN74HC374PWR are preferred.

Q: What packaging format should be selected for production assembly?

A: Tape & reel (TR) packaging is standard for automated pick-and-place assembly. Cut tape (CT) & Digi-Reel® format is suitable for manual assembly or lower-volume applications. SN74HC374PWR provides cut tape format matching the original part. SN74HC374APWR provides tape & reel format for high-volume production.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts listed are ROHS3 compliant. MC74HC374ADTG is marked obsolete and should not be selected for new designs. Compliance certification is maintained across all recommended Tier 1 and Tier 2 alternatives.

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