74LVQ573QSC Equivalent & Substitute Parts

Part Overview

The 74LVQ573QSC is a D-Type Transparent Latch IC with 8:8 circuit configuration and tri-state output, manufactured by onsemi in a 20-QSOP package. This component is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. The part operates across a 2V to 3.6V supply voltage range with a propagation delay of 8.5ns and supports 12mA output current capability.

Substiute Parts

74LVQ573QSC

onsemiIn Stock: 95074LVQ573QSC Datasheet

Current PartRFQ

SN74LV573ADBR

Texas InstrumentsIn Stock: 3150SN74LV573ADBR Datasheet

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SN74LV573ADGVR

Texas InstrumentsIn Stock: 4412SN74LV573ADGVR Datasheet

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SN74LV573APW

Texas InstrumentsIn Stock: 1047SN74LV573APW Datasheet

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SN74LV573APWR

Texas InstrumentsIn Stock: 4166SN74LV573APWR Datasheet

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SN74LV573APWT

Texas InstrumentsIn Stock: 1831SN74LV573APWT Datasheet

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SN74LV573ATPW

Texas InstrumentsIn Stock: 1404SN74LV573ATPW Datasheet

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SN74LV573ATPWR

Texas InstrumentsIn Stock: 2299SN74LV573ATPWR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74LVQ573QSC is determined by the following critical parameters:

• Logic Type & Circuit Configuration: All substitutes must be D-Type Transparent Latch ICs with 8:8 circuit configuration
• Output Type: Tri-state output capability is required
• Operating Temperature Range: Must support -40°C to 85°C minimum
• Mounting Type: Surface mount technology required
• Supply Voltage Compatibility: The 74LVQ573QSC operates at 2V ~ 3.6V. Substitute parts with wider voltage ranges (2V ~ 5.5V) are compatible and provide enhanced flexibility for mixed-voltage applications
• Independent Circuits: Single channel configuration required

All identified substitutes are from the Texas Instruments 74LV573 series, which maintains functional equivalence while offering improved specifications and active product status. Package variations (SSOP, TSSOP, TVSOP) represent different physical form factors suitable for different PCB assembly requirements.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: SN74LV573APWR (Texas Instruments)

This part is the optimal substitute based on active product status, ROHS3 compliance, and widespread availability (4066 pcs in stock). The 20-TSSOP package is a standard form factor suitable for modern PCB assembly processes. The extended supply voltage range (2V ~ 5.5V) provides superior flexibility compared to the original 74LVQ573QSC specification.

Alternative Recommendations by Package Type:

• 20-SSOP Package: SN74LV573ADBR offers the widest package footprint (5.30mm) and maintains active product status with 3100 pcs inventory
• 20-TFSOP Package: SN74LV573ADGVR provides a compact alternative with 4384 pcs in stock and active status
• Tape & Reel Packaging: SN74LV573APWT is available for high-volume production requirements, though marked as discontinued at DiGi Electronics

Avoid: SN74LV573APW and SN74LV573ATPW are both discontinued at DiGi Electronics or in last-time-buy status, limiting long-term supply viability.

All Texas Instruments substitutes provide improved propagation delay (1ns vs 8.5ns) and higher output current capability (16mA vs 12mA), delivering enhanced performance margins for new designs.

Frequently Asked Questions (FAQ)

Q: Can I directly replace the 74LVQ573QSC with any of these Texas Instruments parts?

A: Yes, all listed Texas Instruments SN74LV573 variants are functionally equivalent. The primary consideration is package form factor compatibility with your PCB layout. The 74LVQ573QSC uses a 20-QSOP package; substitutes use 20-SSOP, 20-TSSOP, or 20-TFSOP packages with different physical dimensions.

Q: What is the difference between the various package types?

A: Package differences relate to physical dimensions and PCB footprint requirements. The 20-SSOP (5.30mm width) is the widest, while 20-TSSOP and 20-TFSOP (both 4.40mm width) are narrower. The original 20-QSOP (3.90mm width) is the most compact. All maintain the same 20-pin lead count and electrical functionality.

Q: Are the Texas Instruments parts compatible with the original 3.6V maximum supply voltage?

A: Yes. The Texas Instruments SN74LV573 series supports 2V ~ 5.5V supply voltage, which encompasses the original 2V ~ 3.6V range. The wider voltage specification provides additional design flexibility without compromising compatibility.

Q: What is the significance of the improved propagation delay (1ns vs 8.5ns)?

A: The Texas Instruments substitutes offer significantly faster signal propagation. This improvement is beneficial for timing-critical applications and provides additional performance margin. In applications where the original 8.5ns delay was acceptable, the 1ns specification ensures superior performance.

Q: Which part should I select for new production designs?

A: SN74LV573APWR is recommended for new designs due to active product status, ROHS3 compliance, and strong inventory availability. This ensures long-term supply continuity and regulatory compliance.

Q: Are there any compatibility concerns with mixed-voltage systems?

A: No. The extended 2V ~ 5.5V supply range of the Texas Instruments parts makes them suitable for systems operating at the original 3.6V specification or higher voltages up to 5.5V. The higher output current capability (16mA vs 12mA) also supports more demanding load conditions.