SN74HCT574PWT Equivalent & Substitute Parts

Part Overview

The SN74HCT574PWT is a D-type flip-flop logic integrated circuit manufactured by Texas Instruments, configured as a single element with 8-bit parallel data storage capability. The device features tri-state, non-inverted outputs and operates on positive edge triggering. This part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active product lines that maintain electrical and mechanical compatibility within the 74HCT logic family.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN74HCT574PWT
Manufacturer	Texas Instruments
Logic Family	74HCT
Device Type	D-Type Flip-Flop, 1 Element, 8 Bit
Output Configuration	Tri-State, Non-Inverted
Clock Frequency	40 MHz
Propagation Delay	47 ns @ 5.5V, 150pF
Supply Voltage Range	4.5V – 5.5V
Output Current (High/Low)	6 mA / 6 mA
Quiescent Current	8 µA
Operating Temperature	-40°C to 85°C
Package Type	20-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SN74HCT574PWT is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Logic family classification (74HCT series)
Device function (D-type flip-flop, 1 element, 8-bit configuration)
Output type (tri-state, non-inverted)
Trigger mechanism (positive edge)
Supply voltage range (4.5V – 5.5V)
Package type (20-TSSOP with 0.173" width, 4.40mm)
Mounting type (surface mount)

Allowable Variation Parameters:

Clock frequency (minimum 30 MHz acceptable for standard logic applications)
Propagation delay (within typical operating conditions)
Output current capability (6 mA minimum)
Quiescent current (up to 8 µA)
Operating temperature range (minimum -40°C to 85°C)
Input capacitance (3 pF to 10 pF range)

Substitutes are classified into three categories: parametric equivalents (identical base function, minor performance variations), direct manufacturer alternatives (same base product number from different manufacturers), and upgraded variants (enhanced performance characteristics within compatible parameters).

Parameter Comparison

Part Number	Manufacturer	Status	Clock Freq (MHz)	Prop Delay (ns)	Output Current (mA)	Iq (µA)	Temp Range (°C)	Packaging
SN74HCT574PWT	Texas Instruments	Discontinued	40	47 @ 5.5V, 150pF	6/6	8	-40 to 85	CT & Digi-Reel
SN74HCT574PWR	Texas Instruments	Active	40	47 @ 5.5V, 150pF	6/6	8	-40 to 85	CT & Digi-Reel
SN74HCT374PWR	Texas Instruments	Active	40	41 @ 5.5V, 150pF	6/6	8	-40 to 85	Tape & Reel
SN74HCT374PWT	Texas Instruments	Discontinued	40	41 @ 5.5V, 150pF	6/6	8	-40 to 85	Tape & Reel
MM74HCT574MTC	onsemi	Active	33	30 @ 5V, 50pF	7.2/7.2	8	-40 to 85	Tube
MM74HCT574MTCX	onsemi	Active	33	30 @ 5V, 50pF	7.2/7.2	8	-40 to 85	CT & Digi-Reel
74HCT574PW/AUJ	NXP USA Inc.	Active	69	33 @ 4.5V, 50pF	6/6	8	-40 to 125	Surface Mount
74HCT574PW,118	Nexperia USA Inc.	Active	76	33 @ 4.5V, 50pF	6/6	8	-40 to 125	Tape & Reel
74HCT574PW-Q100,11	Nexperia USA Inc.	Active	76	33 @ 4.5V, 50pF	6/6	8	-40 to 125	Tape & Reel
MC74HCT574ADTR2G	onsemi	Active	30	30 @ 5V, 50pF	6/6	4	-55 to 125	Tape & Reel
MC74VHCT574ADTRG	onsemi	Active	130	10.4 @ 5V, 50pF	8/8	4	-40 to 85	Tape & Reel

Engineering Selection Recommendations

Primary Recommendation: SN74HCT574PWR

The SN74HCT574PWR from Texas Instruments is the direct active-status equivalent to the discontinued SN74HCT574PWT. This part maintains identical electrical specifications, supply voltage range, output configuration, and operating temperature limits. The only difference is packaging format (Cut Tape & Digi-Reel versus standard reel configuration). This part is currently in active production with 2,080 units in stock and carries full ROHS3 compliance and unlimited moisture sensitivity rating.

Secondary Recommendation: 74HCT574PW,118 (Nexperia USA Inc.)

The 74HCT574PW,118 offers enhanced performance characteristics including higher clock frequency (76 MHz versus 40 MHz) and faster propagation delay (33 ns versus 47 ns). Extended operating temperature range (-40°C to 125°C) provides additional thermal margin. This part is actively manufactured with 33,864 units in inventory, ensuring supply continuity. ROHS3 compliance and unlimited MSL rating are maintained.

Automotive-Grade Option: 74HCT574PW-Q100,11

For applications requiring automotive qualification, the 74HCT574PW-Q100,11 from Nexperia USA Inc. provides AEC-Q100 certification with identical electrical performance to the 74HCT574PW,118. This variant is suitable for automotive and industrial environments requiring formal qualification documentation.

Extended Temperature Range Option: MC74HCT574ADTR2G

The MC74HCT574ADTR2G from onsemi extends the operating temperature range to -55°C to 125°C while maintaining 74HCT logic family compatibility. Quiescent current is reduced to 4 µA. This option is appropriate for applications requiring wider temperature operation or lower standby power consumption.

High-Speed Alternative: MC74VHCT574ADTRG

The MC74VHCT574ADTRG represents an upgrade path for applications requiring higher clock frequency (130 MHz) and significantly faster propagation delay (10.4 ns). This device operates within the same supply voltage and package specifications but belongs to the 74VHCT logic family, offering enhanced speed performance at the cost of slightly higher output current (8 mA).

Frequently Asked Questions (FAQ)

Q: Can I directly replace SN74HCT574PWT with SN74HCT574PWR?

A: Yes. Both parts are Texas Instruments 74HCT574 devices with identical electrical specifications, supply voltage requirements, output configuration, and operating temperature range. The difference is packaging format only. SN74HCT574PWR is the active production equivalent.

Q: What is the difference between the SN74HCT574 and SN74HCT374 variants?

A: The SN74HCT574 and SN74HCT374 are different device types within the 74HCT family. While both are 8-bit D-type flip-flops in 20-TSSOP packages, they have different internal logic configurations and are not interchangeable. The SN74HCT374PWT and SN74HCT374PWR are listed as separate product lines.

Q: Are onsemi MM74HCT574 parts compatible with Texas Instruments SN74HCT574?

A: Yes, within the specified parameters. The MM74HCT574MTC and MM74HCT574MTCX maintain the same logic family classification, device function, output type, and package specifications. Minor variations exist in clock frequency (33 MHz versus 40 MHz) and propagation delay characteristics, but these remain within acceptable substitution parameters for standard 74HCT applications.

Q: What is the advantage of Nexperia 74HCT574PW,118 over the Texas Instruments SN74HCT574PWR?

A: The Nexperia part offers higher clock frequency (76 MHz versus 40 MHz), faster propagation delay (33 ns versus 47 ns), and extended operating temperature range (-40°C to 125°C versus -40°C to 85°C). These enhancements provide additional performance margin and thermal headroom for demanding applications.

Q: Can I use MC74VHCT574ADTRG as a direct replacement?

A: The MC74VHCT574ADTRG is not a direct replacement. While it maintains the same package type and supply voltage range, it belongs to the 74VHCT logic family rather than 74HCT. This represents an upgrade path for applications requiring higher speed (130 MHz clock frequency, 10.4 ns propagation delay) but requires verification of logic level compatibility with existing circuit designs.

Q: What packaging options are available for active 74HCT574 devices?

A: Active production variants are available in Tape & Reel (TR), Cut Tape & Digi-Reel (CT), and Tube packaging formats. Selection depends on procurement volume and assembly line requirements. Tape & Reel packaging is standard for high-volume production; Cut Tape & Digi-Reel is suitable for lower-volume or mixed-component orders.

Q: Are all listed substitutes ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1) ratings, ensuring compatibility with modern manufacturing processes and environmental regulations.

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