PI74FCT543ATS Equivalent & Substitute Parts

Part Overview

The PI74FCT543ATS is a non-inverting octal transceiver logic IC manufactured by Diodes Incorporated, housed in a 20-SOIC package. This component functions as a 1-element, 8-bit transceiver with 3-state output capability, operating within the 4.75V to 5.25V supply voltage range. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations.

Substiute Parts

PI74FCT543ATS

Diodes IncorporatedIn Stock: 980PI74FCT543ATS Datasheet

Current PartRFQ

CY74FCT2543ATSOC

Texas InstrumentsIn Stock: 2020CY74FCT2543ATSOC Datasheet

MFR RecommendedRFQ

CY74FCT2543CTSOC

Cypress Semiconductor CorpIn Stock: 7064CY74FCT2543CTSOC Datasheet

MFR RecommendedRFQ

CY74FCT543ATSOC

Texas InstrumentsIn Stock: 1515CY74FCT543ATSOC Datasheet

MFR RecommendedRFQ

CY74FCT543TSOC

Texas InstrumentsIn Stock: 2179CY74FCT543TSOC Datasheet

MFR RecommendedRFQ

CY74FCT543TSOCT

Texas InstrumentsIn Stock: 1995CY74FCT543TSOCT Datasheet

MFR RecommendedRFQ

74FCT245ATSOG

Renesas Electronics CorporationIn Stock: 73374FCT245ATSOG Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PI74FCT543ATS are classified based on strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Logic Type: Transceiver, Non-Inverting
• Number of Elements: 1
• Number of Bits per Element: 8
• Output Type: 3-State
• Voltage - Supply: 4.75V ~ 5.25V
• Operating Temperature: -40°C ~ 85°C (TA)
• Mounting Type: Surface Mount
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitution Categories:

MFR Recommended Substitutes maintain full electrical compatibility with identical or superior output current specifications and active product status with RoHS3 compliance. These parts are direct functional replacements with enhanced regulatory compliance.

Parametric Equivalent parts maintain all critical electrical parameters and operating conditions but may differ in package configuration or base product number while preserving functional compatibility within the specified parameter ranges.

Parameter Comparison

Engineering Selection Recommendations

For Direct Package Compatibility (20-SOIC):

The 74FCT245ATSOG from Renesas Electronics Corporation provides parametric equivalence with identical package configuration. This part maintains the 20-SOIC form factor, matching the original PI74FCT543ATS footprint. The part is active with ROHS3 compliance and identical output current specifications (15mA high, 64mA low).

For Enhanced Compliance and Active Product Status:

The CY74FCT543ATSOC, CY74FCT543TSOC, and CY74FCT543TSOCT from Texas Instruments offer MFR recommended substitution with active product status and ROHS3 compliance. These parts feature enhanced output current capability (32mA high, 64mA low) and are available in multiple packaging formats (Tube, Tape & Reel). Package migration from 20-SOIC to 24-SOIC requires PCB layout modification.

For Alternative Base Product Number:

The CY74FCT2543ATSOC and CY74FCT2543CTSOC provide MFR recommended substitution with the 74FCT2543 base product number. These parts maintain full electrical compatibility within the specified parameter ranges and offer active product status with ROHS3 compliance (CY74FCT2543ATSOC). Output current specifications differ (15mA high, 12mA low), suitable for applications not requiring the full 64mA low-side current of the original part.

Frequently Asked Questions (FAQ)

Q: Can I use a 24-SOIC package substitute in place of the original 20-SOIC PI74FCT543ATS?

A: Package substitution from 20-SOIC to 24-SOIC requires PCB layout modification. The 24-SOIC package has a different pin count and footprint. Electrical compatibility is maintained, but physical board redesign is necessary. The 74FCT245ATSOG maintains the original 20-SOIC package for direct board-level compatibility.

Q: What is the difference between MFR Recommended and Parametric Equivalent substitutes?

A: MFR Recommended substitutes (CY74FCT2543ATSOC, CY74FCT2543CTSOC, CY74FCT543ATSOC, CY74FCT543TSOC, CY74FCT543TSOCT) are actively supported by manufacturers with current product status and enhanced compliance certifications. Parametric Equivalent parts (74FCT245ATSOG) maintain all critical electrical parameters and operating conditions but may differ in base product number or package configuration.

Q: Are all substitute parts RoHS3 compliant?

A: All MFR Recommended substitutes carry ROHS3 Compliant status. The CY74FCT2543CTSOC does not specify RoHS status in the provided data. The original PI74FCT543ATS is RoHS non-compliant. For applications requiring RoHS3 compliance, select from the actively compliant substitute options.

Q: What output current specifications should I consider when selecting a substitute?

A: The original PI74FCT543ATS provides 15mA output high and 64mA output low current. The CY74FCT543 series (CY74FCT543ATSOC, CY74FCT543TSOC, CY74FCT543TSOCT) offers enhanced 32mA output high capability. The CY74FCT2543 series provides 15mA output high and 12mA output low. The 74FCT245ATSOG matches the original 15mA/64mA specification. Select based on your circuit's current drive requirements.

Q: Which substitute offers the best long-term availability?

A: All substitute parts carry active product status, indicating ongoing manufacturer support. The CY74FCT543 series from Texas Instruments and the CY74FCT2543 series offer multiple packaging options (Tube, Bulk, Tape & Reel), providing flexibility for different procurement and assembly requirements.

Q: Can I use CY74FCT2543ATSOC as a direct replacement for PI74FCT543ATS?

A: The CY74FCT2543ATSOC maintains electrical compatibility within the specified parameter ranges but requires package migration from 20-SOIC to 24-SOIC. Additionally, the output low current is reduced from 64mA to 12mA. Verify that your circuit design accommodates these differences before implementation.