74HC574DB,112 Equivalent & Substitute Parts

Part Overview

The 74HC574DB,112 is a D-type flip-flop logic integrated circuit manufactured by Nexperia USA Inc., featuring 1 element with 8-bit positive edge triggering and tri-state non-inverted output. This component operates across a 2V to 6V supply range with a maximum propagation delay of 26ns at 6V with 50pF load. The part is classified as Obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage supply, propagation delay, output characteristics, and thermal operating range while accommodating different packaging formats.

Key Parameters

Parameter	Value
Manufacturer Part Number	74HC574DB,112
Manufacturer	Nexperia USA Inc.
Base Product Number	74HC574
Category	Logic
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
Voltage Supply Range	2V ~ 6V
Clock Frequency	133 MHz
Max Propagation Delay @ 6V, 50pF	26ns
Current Output High/Low	7.8mA / 7.8mA
Quiescent Current (Iq)	8 µA
Input Capacitance	4.6 pF
Operating Temperature	-40°C ~ 125°C
Package Type	20-SSOP (0.209", 5.30mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the 74HC574DB,112 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Base product number: 74HC574 (same logic function and pin configuration)
Output type: Tri-state, non-inverted
Number of elements: 1
Number of bits per element: 8
Trigger type: Positive edge
Voltage supply range: 2V ~ 6V (minimum requirement)
Current output capability: 7.8mA minimum for both high and low states
Quiescent current: 8 µA maximum
Mounting type: Surface mount

Package Compatibility Considerations:

20-SSOP (0.209", 5.30mm Width) - direct mechanical replacement
20-TSSOP (0.173", 4.40mm Width) - functionally equivalent with different footprint

Performance Parameters:

Clock frequency: 40 MHz minimum (all substitutes meet or exceed this threshold)
Propagation delay: Must not exceed 46ns @ 6V, 150pF load
Operating temperature: Minimum -40°C ~ 85°C (some substitutes extend to 125°C)
Input capacitance: 3 pF to 5 pF acceptable range

Substitutes are grouped by package type and product status to facilitate selection based on design constraints and supply chain availability.

Parameter Comparison

Part Number	Manufacturer	Package Type	Clock Frequency	Max Propagation Delay @ 6V	Operating Temperature	Product Status	Inventory
74HC574DB,112	Nexperia USA Inc.	20-SSOP (5.30mm)	133 MHz	26ns @ 50pF	-40°C ~ 125°C	Obsolete	995 Pcs
74HC574PW,118	Nexperia USA Inc.	20-TSSOP (4.40mm)	133 MHz	26ns @ 50pF	-40°C ~ 125°C	Active	47315 Pcs
MM74HC574MTC	Fairchild Semiconductor	20-TSSOP (4.40mm)	35 MHz	27ns @ 150pF	-40°C ~ 85°C	Active	8889 Pcs
MM74HC574MTCX	onsemi	20-TSSOP (4.40mm)	35 MHz	27ns @ 150pF	-40°C ~ 85°C	Active	9784 Pcs
SN74HC574DBR	Texas Instruments	20-SSOP (5.30mm)	40 MHz	31ns @ 50pF	-40°C ~ 85°C	Active	2140 Pcs
SN74HC574PW	Texas Instruments	20-TSSOP (4.40mm)	36 MHz	46ns @ 150pF	-40°C ~ 85°C	Last Time Buy	1278 Pcs
SN74HC574PWR	Texas Instruments	20-TSSOP (4.40mm)	40 MHz	31ns @ 50pF	-40°C ~ 85°C	Active	2200 Pcs
SN74HC574PWRG4	Texas Instruments	20-TSSOP (4.40mm)	40 MHz	31ns @ 50pF	-40°C ~ 85°C	Discontinued at DiGi Electronics	815 Pcs
SN74HC574PWT	Texas Instruments	20-TSSOP (4.40mm)	40 MHz	31ns @ 50pF	-40°C ~ 85°C	Last Time Buy	1376 Pcs

Engineering Selection Recommendations

Primary Recommendation - Same Package (20-SSOP): SN74HC574DBR (Texas Instruments) provides direct mechanical compatibility with the 74HC574DB,112 footprint. This part maintains the 20-SSOP package format, eliminating PCB redesign requirements. The part is currently Active in product status with 2140 units in stock. Electrical parameters remain within acceptable tolerance, with 31ns propagation delay at 6V with 50pF load versus the original 26ns specification. Operating temperature range of -40°C to 85°C covers standard industrial applications, though it does not extend to the original 125°C maximum.

Primary Recommendation - Compact Package (20-TSSOP): 74HC574PW,118 (Nexperia USA Inc.) is the direct functional equivalent with Active product status and highest inventory availability (47315 units). This part maintains identical electrical performance to the original (133 MHz clock frequency, 26ns propagation delay at 6V with 50pF load) and extends the operating temperature range to -40°C to 125°C. The 20-TSSOP package is 0.173" width versus 0.209" for SSOP, requiring PCB layout modification but offering space efficiency. This part is supplied in Cut Tape and Digi-Reel packaging formats.

Secondary Recommendation - Alternative Manufacturers: SN74HC574PWR (Texas Instruments) offers Active product status with 2200 units available in Cut Tape and Digi-Reel format. Performance specifications (40 MHz clock, 31ns propagation delay at 6V with 50pF) are acceptable for most applications. Operating temperature range is -40°C to 85°C.

Inventory and Supply Considerations: Parts with Last Time Buy or Discontinued status (SN74HC574PW, SN74HC574PWT, SN74HC574PWRG4) should be evaluated only when current Active alternatives cannot meet design requirements. These parts have limited remaining inventory and represent end-of-life components.

Compliance Status: All substitute parts listed maintain ROHS3 compliance and REACH Unaffected status, consistent with the original part's regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can I use a 20-TSSOP package part as a direct replacement for the 20-SSOP original? A: Electrically yes, mechanically no. The 20-TSSOP package (0.173" width) and 20-SSOP package (0.209" width) have different footprints. PCB layout modification is required. Pin configuration and electrical function remain identical.

Q: What is the difference between 74HC574PW,118 and SN74HC574PWR? A: Both are 20-TSSOP packages with Active product status. The 74HC574PW,118 (Nexperia) offers superior clock frequency (133 MHz vs. 40 MHz) and identical propagation delay (26ns vs. 31ns at 6V, 50pF). The SN74HC574PWR (Texas Instruments) is an acceptable alternative with slightly higher propagation delay but adequate performance for standard applications.

Q: Why does the original part show Obsolete status? A: The 74HC574DB,112 is classified as Obsolete by Nexperia USA Inc., indicating it is no longer in active production. Substitute parts from active product lines ensure long-term supply chain stability and continued availability.

Q: Are there temperature range limitations I should consider? A: The original part operates from -40°C to 125°C. Most substitute parts operate from -40°C to 85°C. If your application requires operation above 85°C, the 74HC574PW,118 (Nexperia) maintains the full -40°C to 125°C range.

Q: What packaging formats are available for substitute parts? A: Substitute parts are available in multiple formats: Cut Tape (CT) & Digi-Reel, Tape & Reel (TR), Tube, and Bulk. Selection depends on production volume and assembly process requirements.

Q: How do propagation delay specifications differ between parts? A: Propagation delay is measured under specific load conditions. The original part specifies 26ns at 6V with 50pF load. Some substitutes specify 27ns or 31ns at the same conditions, or 46ns at higher load (150pF). These variations remain within acceptable logic circuit timing margins for standard applications.

Q: Is the Fairchild MM74HC574MTC equivalent to the onsemi MM74HC574MTCX? A: Both parts share identical electrical specifications (35 MHz clock, 27ns propagation delay at 6V with 150pF load, -40°C to 85°C operating range) and 20-TSSOP package format. The primary difference is manufacturer (Fairchild Semiconductor vs. onsemi) and packaging format (Bulk vs. Cut Tape & Digi-Reel).

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