SN74HC574PWT Equivalent & Substitute Parts

Part Overview

The SN74HC574PWT 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 device is classified as Last Time Buy, indicating limited availability from the original manufacturer. Equivalent and substitute parts are necessary to ensure design continuity, maintain supply chain flexibility, and accommodate varying performance requirements across different application scenarios.

Key Parameters

Parameter	Value
Function 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	40 MHz
Max Propagation Delay @ 6V, 50pF	31 ns
Voltage Supply Range	2V to 6V
Current Output High/Low	7.8 mA / 7.8 mA
Quiescent Current (Iq)	8 µA
Input Capacitance	3 pF
Operating Temperature Range	-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

Substitute parts for the SN74HC574PWT are categorized based on the following critical parameters that determine functional compatibility:

Core Compatibility Criteria:

D-Type flip-flop architecture with 1 element, 8-bit configuration
Tri-state, non-inverted output topology
Positive edge trigger mechanism
20-TSSOP package footprint (0.173", 4.40mm Width)
Surface mount mounting type
Supply voltage range overlap with 2V to 6V specification
RoHS3 compliance and MSL 1 rating

Substitution Categories:

MFR Recommended (Direct Replacements): Parts meeting or exceeding all electrical parameters while maintaining identical or superior performance characteristics. SN74HC574APWR and 74HC574PW,118 fall into this category with active product status and full parameter compatibility.

Parametric Equivalents: Parts with identical core functionality and package but variations in clock frequency, propagation delay, or quiescent current. SN74HC574PWR and SN74HC574PWRG4 provide parametric equivalence with identical electrical specifications to the main part.

Upgrade Options: Parts offering enhanced performance metrics including higher clock frequency, lower propagation delay, or extended temperature range. 74HC574PW/AUJ (NXP) and 74AHC574PW,118 (Nexperia) provide performance upgrades with improved timing characteristics.

Alternative Series: Parts from different logic families (74AHC, 74VHC) offering superior performance with compatible pinouts and package specifications but different electrical operating characteristics.

Parameter Comparison

Part Number	Manufacturer	Clock Frequency (MHz)	Max Propagation Delay @ 6V, 50pF (ns)	Voltage Supply (V)	Iq (µA)	Operating Temp (°C)	Product Status	Packaging
SN74HC574PWT	Texas Instruments	40	31	2-6	8	-40 to 85	Last Time Buy	Tape & Reel
SN74HC574APWR	Texas Instruments	84	33	2-6	8	-40 to 85	Active	Tape & Reel
SN74HC574PWR	Texas Instruments	40	31	2-6	8	-40 to 85	Active	Cut Tape & Digi-Reel
SN74HC574PWRG4	Texas Instruments	40	31	2-6	8	-40 to 85	Discontinued at DiGi Electronics	Cut Tape & Digi-Reel
74HC574PW/AUJ	NXP USA Inc.	133	26	2-6	8	-40 to 125	Active	Surface Mount
74AHC374PW,118	Nexperia USA Inc.	120	10.1	2-5.5	4	-40 to 125	Active	Tape & Reel
74AHC574PW,118	Nexperia USA Inc.	115	10.6	2-5.5	4	-40 to 125	Active	Tape & Reel
74HC574PW,118	Nexperia USA Inc.	133	26	2-6	8	-40 to 125	Active	Cut Tape & Digi-Reel
74HC574PW-Q100,118	Nexperia USA Inc.	133	26	2-6	8	-40 to 125	Active	Tape & Reel
74VHC574MTC	Fairchild Semiconductor	115	10.6	2-5.5	4	-40 to 85	Active	Surface Mount
74VHC574MTCX	onsemi	115	10.6	2-5.5	4	-40 to 85	Active	Tape & Reel

Engineering Selection Recommendations

For Direct Replacement with Active Supply: SN74HC574APWR (Texas Instruments) is the primary recommendation for direct substitution. This part maintains identical electrical specifications to the SN74HC574PWT while offering active product status and higher inventory availability. Both parts operate within the 2V to 6V supply range, share identical output current ratings, and maintain the same quiescent current specification.

For Parametric Equivalence: SN74HC574PWR and SN74HC574PWRG4 provide parametric equivalence with identical electrical characteristics. SN74HC574PWR is preferred due to active product status, while SN74HC574PWRG4 is discontinued at DiGi Electronics and should be avoided for new designs.

For Performance Enhancement with Extended Temperature Range: 74HC574PW,118 (Nexperia) and 74HC574PW-Q100,118 (Nexperia automotive grade) offer improved clock frequency (133 MHz vs. 40 MHz) and reduced propagation delay (26 ns vs. 31 ns) while extending the operating temperature range to -40°C to 125°C. The automotive-qualified variant (74HC574PW-Q100,118) includes AEC-Q100 certification for applications requiring automotive-grade components.

For Superior Performance with Lower Power Consumption: 74AHC574PW,118 (Nexperia) delivers significantly improved timing performance (10.6 ns propagation delay, 115 MHz clock frequency) and reduced quiescent current (4 µA vs. 8 µA). This part operates within a narrower supply voltage range (2V to 5.5V) and extends the operating temperature to -40°C to 125°C. Selection of this part requires verification that the application supply voltage does not exceed 5.5V.

For Alternative Series with Comparable Performance: 74VHC574MTCX (onsemi) provides equivalent performance to the 74AHC series with 115 MHz clock frequency and 10.6 ns propagation delay. This part maintains the 2V to 5.5V supply range and 4 µA quiescent current but limits operating temperature to -40°C to 85°C.

Compliance Considerations: All recommended substitute parts maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage practices. The 74HC574PW-Q100,118 variant includes AEC-Q100 automotive qualification for applications requiring automotive-grade component certification.

Frequently Asked Questions (FAQ)

Q: Can SN74HC574APWR be used as a direct replacement for SN74HC574PWT?

A: Yes. SN74HC574APWR is a direct functional replacement. Both parts share identical D-type flip-flop architecture, 8-bit configuration, tri-state non-inverted output topology, positive edge triggering, 20-TSSOP package footprint, and electrical operating parameters including 2V to 6V supply voltage, 7.8 mA output current, and 8 µA quiescent current. The primary difference is product status: SN74HC574APWR is active with higher inventory availability, while SN74HC574PWT is Last Time Buy.

Q: What is the difference between 74HC574PW,118 and 74HC574PW-Q100,118?

A: Both parts are manufactured by Nexperia and share identical electrical specifications: 133 MHz clock frequency, 26 ns propagation delay, 2V to 6V supply voltage, and -40°C to 125°C operating temperature. The primary distinction is qualification: 74HC574PW-Q100,118 includes AEC-Q100 automotive-grade certification, making it suitable for automotive applications requiring formal qualification documentation. 74HC574PW,118 is the standard industrial-grade variant.

Q: Can 74AHC574PW,118 replace SN74HC574PWT in all applications?

A: 74AHC574PW,118 is functionally compatible but operates within a narrower supply voltage range (2V to 5.5V vs. 2V to 6V). Applications requiring operation above 5.5V cannot use this substitute. For applications operating within the 2V to 5.5V range, 74AHC574PW,118 offers superior performance with 10.6 ns propagation delay, 115 MHz clock frequency, and reduced quiescent current (4 µA). Extended operating temperature range (-40°C to 125°C) is an additional benefit.

Q: What are the key differences between 74HC and 74AHC logic families?

A: Both families maintain identical D-type flip-flop architecture and 20-TSSOP package compatibility. The 74AHC family offers superior performance characteristics: faster propagation delay (10.6 ns vs. 31 ns), higher clock frequency (115 MHz vs. 40 MHz), and lower quiescent current (4 µA vs. 8 µA). The 74AHC family operates within a narrower supply voltage range (2V to 5.5V) and extends the operating temperature to -40°C to 125°C. Selection depends on application timing requirements and supply voltage constraints.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All recommended substitute parts listed maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing processes and storage requirements.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in three packaging formats: Tape & Reel (TR), Cut Tape (CT) & Digi-Reel, and standard Surface Mount. Selection depends on procurement and assembly requirements. Tape & Reel packaging is standard for high-volume production, while Cut Tape & Digi-Reel accommodates lower-volume requirements.

Q: Can 74VHC574MTCX be used instead of 74AHC574PW,118?

A: Yes, for applications operating within -40°C to 85°C temperature range. Both parts share identical electrical specifications: 115 MHz clock frequency, 10.6 ns propagation delay, 2V to 5.5V supply voltage, 8 mA output current, and 4 µA quiescent current. The primary difference is operating temperature range: 74VHC574MTCX limits operation to -40°C to 85°C, while 74AHC574PW,118 extends to -40°C to 125°C. For applications requiring extended temperature operation, 74AHC574PW,118 is the appropriate selection.

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