74LCX574MSA Equivalent & Substitute Parts

Part Overview

The 74LCX574MSA is a D-type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 8-bit positive edge triggering in a 20-SSOP package. This part is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Substitute parts maintain functional compatibility while offering improved availability and extended product lifecycles.

Key Parameters

Parameter	Value
Manufacturer Part Number	74LCX574MSA
Manufacturer	onsemi
Series	74LCX
Type	D-Type Flip-Flop
Number of Elements	1
Number of Bits per Element	8
Output Type	Tri-State, Non-Inverted
Clock Frequency	150 MHz
Max Propagation Delay @ 3.3V, 50pF	8.5 ns
Trigger Type	Positive Edge
Current - Output High/Low	24 mA / 24 mA
Voltage - Supply	2V ~ 3.6V
Current - Quiescent (Iq)	10 µA
Input Capacitance	7 pF
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	20-SSOP (0.209", 5.30mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Functional Compatibility Requirements:

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

Electrical Compatibility Requirements:

Clock Frequency: minimum 150 MHz
Max Propagation Delay @ 3.3V: maximum 8.5 ns
Current - Output High/Low: 24 mA / 24 mA
Voltage - Supply: must encompass 2V ~ 3.6V range
Current - Quiescent (Iq): 10 µA
Operating Temperature: must support -40°C minimum

Package Compatibility:

Mounting Type: Surface Mount
Package options: 20-SSOP or 20-TSSOP (both 20-pin configurations)

Substitute parts are grouped into two categories based on package type: 20-SSOP (direct footprint match) and 20-TSSOP (compatible pinout, different package dimensions).

Parameter Comparison

Part Number	Manufacturer	Series	Clock Frequency (MHz)	Max Propagation Delay @ 3.3V (ns)	Voltage Supply (V)	Operating Temp (°C)	Package	Product Status
74LCX574MSA	onsemi	74LCX	150	8.5	2.0 ~ 3.6	-40 ~ 85	20-SSOP	Obsolete
MC74LCX574DTG	onsemi	74LCX	150	8.5	2.0 ~ 3.6	-40 ~ 85	20-TSSOP	Obsolete
74LVC574APW,118	NXP Semiconductors	74LVC	200	7.0	1.65 ~ 3.6	-40 ~ 125	20-TSSOP	Active
74LVC574APW/AUJ	NXP USA Inc.	74LVC	200	7.0	1.65 ~ 3.6	-40 ~ 125	20-TSSOP	Active
CLVC374AQPWRG4Q1	Texas Instruments	74LVC	100	8.5	2.0 ~ 3.6	-40 ~ 125	20-TSSOP	Active
SN74LVC574ADBR	Texas Instruments	74LVC	150	6.8	1.65 ~ 3.6	-40 ~ 125	20-SSOP	Active
SN74LVC574APW	Texas Instruments	74LVC	150	6.8	1.65 ~ 3.6	-40 ~ 125	20-TSSOP	Active
SN74LVC574APWR	Texas Instruments	74LVC	150	6.8	1.65 ~ 3.6	-40 ~ 125	20-TSSOP	Active
SN74LVC574APWT	Texas Instruments	74LVC	150	6.8	1.65 ~ 3.6	-40 ~ 125	20-TSSOP	Active
SN74LVC574AQPWREP	Texas Instruments	74LVC	150	7.0	2.0 ~ 3.6	-40 ~ 125	20-TSSOP	Active

Engineering Selection Recommendations

20-SSOP Package (Direct Footprint Compatibility):

SN74LVC574ADBR is the primary substitute for 20-SSOP applications. It maintains the same package footprint as the 74LCX574MSA while offering active product status, extended operating temperature range (-40°C to 125°C), and improved propagation delay (6.8 ns vs. 8.5 ns). The part is RoHS3 compliant and widely available.

20-TSSOP Package (Pinout Compatible, Smaller Footprint):

For designs that can accommodate package migration, multiple active alternatives exist:

SN74LVC574APWR and SN74LVC574APWT offer the best performance match with 150 MHz clock frequency, 6.8 ns propagation delay, and extended temperature range. Both are RoHS3 compliant with high inventory availability.

SN74LVC574APW and 74LVC574APW,118 provide enhanced performance with 200 MHz clock frequency and 7 ns propagation delay, suitable for higher-speed applications.

CLVC374AQPWRG4Q1 is qualified to AEC-Q100 automotive standards and maintains the original 8.5 ns propagation delay specification, appropriate for automotive-grade applications.

SN74LVC574AQPWREP offers voltage supply range matching the original part (2V ~ 3.6V) with active status and RoHS3 compliance.

All recommended substitutes maintain tri-state, non-inverted output configuration, positive edge triggering, and 24 mA output drive capability.

Frequently Asked Questions (FAQ)

Q: Can I use a 20-TSSOP package part as a direct replacement for the 20-SSOP 74LCX574MSA?

A: Pinout compatibility exists between 20-TSSOP and 20-SSOP packages for this device family, but physical footprints differ. 20-TSSOP is narrower (0.173" vs. 0.209" width). PCB layout modification is required; direct socket substitution is not possible.

Q: What is the minimum clock frequency requirement for substitutes?

A: Substitute parts must support at least 150 MHz clock frequency to maintain functional compatibility with the original 74LCX574MSA specification.

Q: Are all listed substitutes RoHS compliant?

A: All active substitute parts listed are RoHS3 compliant. The original 74LCX574MSA does not specify RoHS status.

Q: Which substitute offers the best propagation delay performance?

A: SN74LVC574ADBR and SN74LVC574APW series parts offer 6.8 ns propagation delay, improving upon the original 8.5 ns specification.

Q: Can I use CLVC374AQPWRG4Q1 in non-automotive applications?

A: Yes. AEC-Q100 qualification indicates automotive-grade reliability but does not restrict use in other applications. This part meets all functional and electrical requirements for general logic applications.

Q: What is the voltage supply range compatibility?

A: The original part operates at 2V ~ 3.6V. Most active substitutes support 1.65V ~ 3.6V, providing broader supply voltage compatibility. SN74LVC574AQPWREP and CLVC374AQPWRG4Q1 maintain the original 2V ~ 3.6V range.

Q: Are there inventory differences between substitute options?

A: Yes. SN74LVC574APWR has the highest inventory (237,968 pcs), followed by 74LVC574APW,118 (195,695 pcs). Availability varies by distributor and packaging option.

Q: What is the moisture sensitivity level for substitute parts?

A: All substitute parts maintain MSL 1 (Unlimited) rating, matching the original part specification.

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