74HC574DB,118 Equivalent & Substitute Parts

Part Overview

The 74HC574DB,118 is a D-type flip-flop logic integrated circuit manufactured by Nexperia USA Inc., featuring 1 element with 8-bit positive edge triggering in a 20-SSOP surface mount package. This component is classified as Obsolete, which necessitates identification of functionally equivalent alternatives for new designs and ongoing production requirements. The part operates across a 2V to 6V supply range with a maximum propagation delay of 26ns at 6V with 50pF load, making it suitable for standard digital logic applications requiring edge-triggered data storage.

Substiute Parts

74HC574DB,118

Nexperia USA Inc.In Stock: 110174HC574DB,118 Datasheet

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74HC574PW,118

Nexperia USA Inc.In Stock: 4734874HC574PW,118 Datasheet

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MM74HC574MTC

Fairchild SemiconductorIn Stock: 8968MM74HC574MTC Datasheet

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MM74HC574MTCX

onsemiIn Stock: 9864MM74HC574MTCX Datasheet

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NLV74HC574ADTR2G

onsemiIn Stock: 3704NLV74HC574ADTR2G Datasheet

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SN74HC574DBR

Texas InstrumentsIn Stock: 2190SN74HC574DBR Datasheet

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SN74HC574PW

Texas InstrumentsIn Stock: 1356SN74HC574PW Datasheet

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SN74HC574PWR

Texas InstrumentsIn Stock: 2280SN74HC574PWR Datasheet

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SN74HC574PWRG4

Texas InstrumentsIn Stock: 878SN74HC574PWRG4 Datasheet

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SN74HC574PWT

Texas InstrumentsIn Stock: 1419SN74HC574PWT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74HC574DB,118 is determined by the following critical parameters:

Functional Equivalence Criteria:

• Base product number must be 74HC574 (same logic function and pin configuration)
• Type must be D-Type flip-flop with 1 element and 8-bit configuration
• Output type must be Tri-State, Non-Inverted
• Trigger type must be Positive Edge
• Voltage supply range must encompass or match 2V ~ 6V
• Current output specifications must be 7.8mA for both high and low states

Package Compatibility Criteria:

• Surface mount technology required
• Package options include 20-SSOP (0.209", 5.30mm) or 20-TSSOP (0.173", 4.40mm) formats
• Both packages are mechanically compatible with standard PCB layouts designed for 20-pin SSOP/TSSOP footprints

Performance Considerations:

• Clock frequency and propagation delay specifications may vary among substitutes
• Operating temperature range may differ; substitutes with extended ranges (-55°C to 125°C) provide broader application coverage
• Quiescent current specifications may vary slightly between manufacturers

Substitute parts are grouped into two categories based on package type: SSOP variants (direct footprint match) and TSSOP variants (smaller footprint, same electrical function).

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Active Product Status):

For applications requiring direct footprint compatibility with the original 20-SSOP package, SN74HC574DBR from Texas Instruments is the recommended substitute. This part maintains identical package dimensions, meets all electrical specifications, and carries Active product status with full RoHS3 compliance.

For applications where package size reduction is acceptable, 74HC574PW,118 from Nexperia provides the closest electrical match with Active product status. This part uses the 20-TSSOP package (0.173" width versus 0.209" for SSOP) and maintains identical clock frequency and propagation delay specifications.

SN74HC574PWR from Texas Instruments offers equivalent performance in the 20-TSSOP package with Active product status and is available in Cut Tape & Digi-Reel packaging for high-volume applications.

Secondary Substitutes (Extended Temperature Range):

NLV74HC574ADTR2G from onsemi provides extended operating temperature range (-55°C to 125°C) compared to the original part (-40°C to 125°C), making it suitable for applications requiring broader temperature coverage. This part is classified as Obsolete but remains available in inventory.

Substitutes with Performance Variations:

MM74HC574MTCX from onsemi and MM74HC574MTC from Fairchild Semiconductor operate at reduced clock frequencies (35 MHz versus 133 MHz) and exhibit longer propagation delays under higher load conditions (27ns at 150pF). These parts are suitable only for applications where the lower performance specifications are acceptable.

SN74HC574PW from Texas Instruments is classified as Last Time Buy and exhibits the longest propagation delay (46ns at 150pF) among available substitutes, limiting its use to non-time-critical applications.

Compliance and Certification:

All substitute parts listed maintain ROHS3 compliance and REACH Unaffected status, matching the original part's regulatory requirements. Moisture Sensitivity Level 1 (Unlimited) is consistent across all recommended substitutes, eliminating moisture handling concerns during assembly and storage.

Frequently Asked Questions (FAQ)

Q: Can I use a 20-TSSOP package substitute in a design originally specified for 20-SSOP?

A: No. While both are 20-pin surface mount packages, the 20-TSSOP (0.173" width) and 20-SSOP (0.209" width) have different footprints. PCB layouts designed for one package type will not accommodate the other without redesign. For direct replacement without PCB modification, use SN74HC574DBR, which maintains the 20-SSOP package format.

Q: What is the significance of the different clock frequency ratings among substitutes?

A: Clock frequency indicates the maximum speed at which the flip-flop can reliably capture and store data. The original 74HC574DB,118 operates at 133 MHz. Substitutes with lower ratings (35-40 MHz) are suitable only for applications operating below their specified frequency limits. Exceeding the rated clock frequency may result in timing violations and data corruption.

Q: Why do some substitutes show different propagation delay values at different load capacitances?

A: Propagation delay increases with output load capacitance. The original part specifies 26ns at 50pF load. Some substitutes specify 27ns at 150pF, indicating they are tested under higher load conditions. For direct comparison, propagation delay at 50pF load should be used as the primary criterion.

Q: Are there any substitutes with improved quiescent current performance?

A: NLV74HC574ADTR2G from onsemi specifies 4 µA quiescent current compared to 8 µA for the original part, representing a 50% reduction in standby power consumption. This part is classified as Obsolete but remains available in limited inventory.

Q: What is the difference between "Last Time Buy" and "Discontinued at DiGi Electronics" product status?

A: Last Time Buy indicates the manufacturer has announced end-of-life but continues accepting orders until a specified cutoff date. Discontinued at DiGi Electronics indicates the distributor has ceased stocking the part, though the manufacturer may continue production. Both statuses indicate limited future availability and should be considered when selecting substitutes for long-term production requirements.

Q: Can I substitute a part with extended temperature range (-55°C to 125°C) in an application specified for -40°C to 125°C?

A: Yes. Extended temperature range substitutes are backward compatible with applications requiring narrower ranges. NLV74HC574ADTR2G provides this capability, though it is classified as Obsolete.

Q: Which substitute offers the best balance of availability and performance?

A: SN74HC574PWR from Texas Instruments combines Active product status, high clock frequency (40 MHz), fast propagation delay (31ns at 50pF), and availability in standard Cut Tape & Digi-Reel packaging. For SSOP package requirements, SN74HC574DBR provides equivalent performance with Active status.