74FCT543CTSOG Equivalent & Substitute Parts

Part Overview

The 74FCT543CTSOG is a non-inverting octal transceiver logic IC manufactured by Renesas Electronics Corporation in a 24-SOIC surface mount package. This component features 1 element with 8 bits per element, 3-state output capability, and operates within a 4.75V to 5.25V supply voltage range. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Manufacturer Part Number	74FCT543CTSOG
Manufacturer	Renesas Electronics Corporation
Series	74FCT
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)
Package / Case	24-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 74FCT543CTSOG is determined by the following critical parameters:

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)
Package / Case: 24-SOIC (0.295", 7.50mm Width)
Mounting Type: Surface Mount

All identified substitute parts maintain these core electrical and mechanical specifications. Variations in output current ratings and packaging formats (Tube, Bulk, Tape & Reel) do not affect functional compatibility within the specified operating parameters.

Parameter Comparison

Parameter	74FCT543CTSOG	CY74FCT2543ATSOC	CY74FCT2543CTSOC	CY74FCT543ATSOC	CY74FCT543TSOC	CY74FCT543TSOCT
Manufacturer	Renesas Electronics	Texas Instruments	Cypress Semiconductor	Texas Instruments	Texas Instruments	Texas Instruments
Logic Type	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting
Number of Elements	1	1	1	1	1	1
Number of Bits per Element	8	8	8	8	8	8
Output Type	3-State	3-State	3-State	3-State	3-State	3-State
Current - Output High (mA)	15	15	15	32	32	32
Current - Output Low (mA)	64	12	12	64	64	64
Voltage - Supply	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	24-SOIC	24-SOIC	24-SOIC	24-SOIC	24-SOIC	24-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Not specified	Tube	Bulk	Tube	Tube	Tape & Reel (TR)

Engineering Selection Recommendations

All substitute parts listed maintain active product status, ensuring long-term availability and manufacturing support. The CY74FCT2543ATSOC and CY74FCT2543CTSOC variants feature reduced output low current (12mA versus 64mA), suitable for applications with lower current drive requirements. The CY74FCT543ATSOC, CY74FCT543TSOC, and CY74FCT543TSOCT variants maintain the original output current specifications (32mA high, 64mA low) and are direct functional equivalents to the obsolete 74FCT543CTSOG.

All substitute parts comply with ROHS3 standards where specified and maintain identical electrical operating parameters within the 4.75V to 5.25V supply voltage range and -40°C to 85°C temperature range. Selection between alternatives should be based on packaging format requirements (Tube, Bulk, or Tape & Reel) and current drive specifications appropriate to the application circuit.

Frequently Asked Questions (FAQ)

Q: Can CY74FCT2543ATSOC replace 74FCT543CTSOG directly?

A: CY74FCT2543ATSOC is functionally compatible. Both maintain identical logic type, element count, bit width, output type, supply voltage, and operating temperature specifications. The output low current differs (12mA versus 64mA), which is acceptable in applications not requiring maximum current drive capability.

Q: What is the difference between CY74FCT543ATSOC and CY74FCT543TSOC?

A: Both parts are electrically identical. The difference is packaging format: CY74FCT543ATSOC is supplied in Tube packaging, while CY74FCT543TSOC is supplied in Tube packaging. CY74FCT543TSOCT is supplied in Tape & Reel format for automated assembly processes.

Q: Are all substitutes ROHS3 compliant?

A: CY74FCT2543ATSOC, CY74FCT543ATSOC, CY74FCT543TSOC, and CY74FCT543TSOCT are specified as ROHS3 compliant. CY74FCT2543CTSOC RoHS status is not specified in the provided data.

Q: Does the 24-SOIC package remain consistent across all substitutes?

A: Yes. All substitute parts use the 24-SOIC (0.295", 7.50mm Width) package with surface mount mounting type, ensuring PCB layout compatibility with the original 74FCT543CTSOG design.

Q: Which substitute offers the closest electrical match to the original part?

A: CY74FCT543ATSOC, CY74FCT543TSOC, and CY74FCT543TSOCT maintain identical output current specifications (32mA high, 64mA low) to the original 74FCT543CTSOG, providing the closest electrical equivalence.

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