74AC574MTCX Equivalent & Substitute Parts

Part Overview

The 74AC574MTCX 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 component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	74AC574MTCX
Manufacturer	onsemi
Series	74AC
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
Clock Frequency	153 MHz
Max Propagation Delay @ 5V, 50pF	9.5 ns
Voltage Supply Range	2V ~ 6V
Current Output High/Low	24 mA / 24 mA
Quiescent Current (Iq)	40 µA
Input Capacitance	4.5 pF
Operating Temperature Range	-40°C ~ 85°C
Package Type	20-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 74AC574MTCX are classified based on the following substitution criteria:

Direct Manufacturer Substitutes maintain identical electrical specifications and package configurations, differing only in product status or packaging format (tape & reel vs. tube).

Similar Substitutes share the same functional architecture (D-Type flip-flop, 8-bit, positive edge trigger) and package footprint but belong to different logic series (74AHC instead of 74AC) or have minor package variations (20-SSOP vs. 20-TSSOP). These require verification of voltage supply compatibility and propagation delay tolerance.

Parametric Equivalents provide functionally identical performance with matching electrical characteristics across all critical parameters including clock frequency, propagation delay, output current, and supply voltage range.

Key parameters determining substitutability:

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 Footprint: 20-TSSOP or compatible 20-pin surface mount
Voltage Supply Range: Minimum 2V ~ 6V compatibility
Max Propagation Delay @ 5V, 50pF: 9.5 ns or better

Parameter Comparison

Parameter	74AC574MTCX	MC74AC574DTR2G	SN74AC574PW	74AHC574PW,118	SN74AC574DBR	SN74AC574PWR
Manufacturer	onsemi	onsemi	Texas Instruments	Nexperia USA Inc.	Texas Instruments	Texas Instruments
Series	74AC	74AC	74AC	74AHC	74AC	74AC
Product Status	Obsolete	Active	Discontinued at DiGi Electronics	Active	Active	Active
Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type
Number of Elements	1	1	1	1	1	1
Number of Bits per Element	8	8	8	8	8	8
Output Type	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted
Trigger Type	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge
Clock Frequency	153 MHz	95 MHz	153 MHz	115 MHz	153 MHz	153 MHz
Max Propagation Delay @ 5V, 50pF	9.5 ns	9.5 ns	9.5 ns	10.6 ns	9.5 ns	9.5 ns
Current - Output High, Low	24 mA, 24 mA	24 mA, 24 mA	24 mA, 24 mA	8 mA, 8 mA	24 mA, 24 mA	24 mA, 24 mA
Voltage - Supply	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 5.5V	2V ~ 6V	2V ~ 6V
Current - Quiescent (Iq)	40 µA	8 µA	4 µA	4 µA	4 µA	4 µA
Input Capacitance	4.5 pF	4.5 pF	4.5 pF	3 pF	4.5 pF	4.5 pF
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	20-TSSOP (0.173", 4.40mm Width)	20-TSSOP (0.173", 4.40mm Width)	20-TSSOP (0.173", 4.40mm Width)	20-TSSOP (0.173", 4.40mm Width)	20-SSOP (0.209", 5.30mm Width)	20-TSSOP (0.173", 4.40mm Width)
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Not specified	Tape & Reel (TR)	Tube	Tape & Reel (TR)	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

Primary Recommendation: SN74AC574PWR (Texas Instruments)

The SN74AC574PWR is the optimal substitute for the 74AC574MTCX. It maintains identical electrical specifications including 153 MHz clock frequency, 9.5 ns propagation delay, 24 mA output current, and 2V ~ 6V supply voltage range. The part is active in production with ROHS3 compliance and available in Cut Tape & Digi-Reel packaging format. This selection ensures direct functional compatibility with no design modifications required.

Secondary Recommendation: MC74AC574DTR2G (onsemi)

The MC74AC574DTR2G provides continuity within the onsemi manufacturing ecosystem. While clock frequency is reduced to 95 MHz and quiescent current is 8 µA (compared to 40 µA in the original), propagation delay remains at 9.5 ns and all other critical parameters match. This part is active in production with ROHS3 compliance and available in high-volume Tape & Reel packaging.

Alternative for Extended Temperature Range: 74AHC574PW,118 (Nexperia USA Inc.)

The 74AHC574PW,118 operates across an extended temperature range of -40°C ~ 125°C compared to the standard -40°C ~ 85°C. This part belongs to the 74AHC series with reduced output current (8 mA vs. 24 mA) and slightly higher propagation delay (10.6 ns vs. 9.5 ns). Supply voltage range is 2V ~ 5.5V. Selection of this part requires confirmation that the reduced output current and propagation delay are acceptable for the application.

Package Consideration: SN74AC574DBR (Texas Instruments)

The SN74AC574DBR uses a 20-SSOP package (0.209", 5.30mm width) instead of the standard 20-TSSOP (0.173", 4.40mm width). While electrically equivalent with 153 MHz clock frequency and 9.5 ns propagation delay, this part requires PCB layout modification and is not recommended for direct replacement without board redesign.

Frequently Asked Questions (FAQ)

Q: Can I use MC74AC574DTR2G as a direct replacement for 74AC574MTCX?

A: MC74AC574DTR2G is functionally compatible with identical propagation delay (9.5 ns) and supply voltage range (2V ~ 6V). However, clock frequency is reduced from 153 MHz to 95 MHz, and quiescent current is lower at 8 µA. This substitution is valid if your application does not require the full 153 MHz clock frequency specification.

Q: What is the difference between 74AC574MTCX and SN74AC574PW?

A: Both parts share identical electrical specifications: 153 MHz clock frequency, 9.5 ns propagation delay, 24 mA output current, and 2V ~ 6V supply voltage. The primary differences are manufacturer (onsemi vs. Texas Instruments), product status (obsolete vs. discontinued at DiGi Electronics), and packaging format (not specified vs. tube). SN74AC574PW is the recommended substitute.

Q: Why does 74AHC574PW,118 have different electrical parameters?

A: The 74AHC574PW,118 belongs to the 74AHC logic series rather than 74AC. This results in reduced output current (8 mA vs. 24 mA), slightly higher propagation delay (10.6 ns vs. 9.5 ns), and a narrower supply voltage range (2V ~ 5.5V vs. 2V ~ 6V). The advantage is an extended operating temperature range (-40°C ~ 125°C). Use this part only if your application can tolerate these parameter differences.

Q: Is the SN74AC574DBR package compatible with 74AC574MTCX?

A: SN74AC574DBR uses a 20-SSOP package (0.209", 5.30mm width) while 74AC574MTCX uses 20-TSSOP (0.173", 4.40mm width). These packages have different physical dimensions and pin spacing. Direct PCB substitution is not possible without layout modification.

Q: Which substitute part has the best availability?

A: MC74AC574DTR2G has the highest inventory at 17,800 pieces in stock. SN74AC574PWR has 3,848 pieces available. Both parts are in active production status, ensuring long-term availability compared to discontinued alternatives.

Q: Are all substitute parts RoHS compliant?

A: All recommended substitute parts (MC74AC574DTR2G, SN74AC574PW, 74AHC574PW,118, SN74AC574DBR, and SN74AC574PWR) are ROHS3 compliant. The original 74AC574MTCX RoHS status is not specified in the provided data.

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

A: While all substitute parts are functionally compatible, mixing different manufacturers or logic series (74AC vs. 74AHC) in the same design is not recommended. Maintain consistency within a single part number to ensure uniform electrical behavior, thermal characteristics, and long-term supply chain stability.

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