CY74FCT16543ATPACT Equivalent & Substitute Parts

Part Overview

The CY74FCT16543ATPACT is a non-inverting transceiver logic IC manufactured by Texas Instruments, featuring 2 elements with 8 bits per element and 3-state output capability in a 56-TSSOP package. This part operates at 4.5V to 5.5V supply voltage with output currents of 32mA (high) and 64mA (low), designed for signal buffering and bus interface applications.

The CY74FCT16543ATPACT carries an Obsolete product status. Equivalent and substitute parts are necessary to ensure design continuity, maintain supply chain reliability, and support long-term production requirements where the original part is no longer actively manufactured.

Key Parameters

Parameter	Value
Manufacturer Part Number	CY74FCT16543ATPACT
Manufacturer	Texas Instruments
Series	74FCT
Logic Type	Transceiver, Non-Inverting
Number of Elements	2
Number of Bits per Element	8
Output Type	3-State
Current - Output High, Low	32mA, 64mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	56-TFSOP (0.240", 6.10mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the CY74FCT16543ATPACT are classified based on strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Logic Type: Transceiver, Non-Inverting
Number of Elements: 2
Number of Bits per Element: 8
Output Type: 3-State
Package / Case: 56-TFSOP (0.240", 6.10mm Width)
Mounting Type: Surface Mount
Operating Temperature: -40°C ~ 85°C (TA)
RoHS Status: ROHS3 Compliant

Voltage Supply Classification:

Parts are grouped into two categories based on supply voltage specifications:

5.5V Supply Voltage Group (4.5V ~ 5.5V): Parts with identical supply voltage range to the original CY74FCT16543ATPACT, maintaining full electrical compatibility for designs operating at standard TTL/CMOS voltage levels. These include SN74ABT16543DGGR, SN74ABT16470DGGR, SN74ABT16646DGGR, SN74ABT16952DGGR, and CY74FCT16952CTPACT.
Low Voltage Group (1.65V ~ 3.6V): SN74LVCH16543ADGGR operates at reduced supply voltage, suitable for low-power applications and modern digital systems. This part is classified as a functional equivalent with voltage-dependent design considerations.

All substitute parts maintain identical package geometry, pin count, and functional logic architecture, ensuring mechanical and electrical interchangeability within their respective voltage classification.

Parameter Comparison

Parameter	CY74FCT16543ATPACT	SN74ABT16543DGGR	SN74ABT16470DGGR	SN74ABT16646DGGR	SN74ABT16952DGGR	CY74FCT16952CTPACT	SN74LVCH16543ADGGR
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Series	74FCT	74ABT	74ABT	74ABT	74ABT	74FCT	74LVCH
Logic Type	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting
Number of Elements	2	2	2	2	2	2	2
Number of Bits per Element	8	8	8	8	8	8	8
Output Type	3-State	3-State	3-State	3-State	3-State	3-State	3-State
Current - Output High, Low	32mA, 64mA	32mA, 64mA	32mA, 64mA	32mA, 64mA	32mA, 64mA	32mA, 64mA	24mA, 24mA
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	1.65V ~ 3.6V
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Package / Case	56-TFSOP (0.240", 6.10mm Width)	56-TFSOP (0.240", 6.10mm Width)	56-TFSOP (0.240", 6.10mm Width)	56-TFSOP (0.240", 6.10mm Width)	56-TFSOP (0.240", 6.10mm Width)	56-TFSOP (0.240", 6.10mm Width)	56-TFSOP (0.240", 6.10mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For 5.5V Supply Voltage Applications:

SN74ABT16543DGGR, SN74ABT16470DGGR, SN74ABT16646DGGR, and SN74ABT16952DGGR are all Active product status parts with identical electrical specifications to the original CY74FCT16543ATPACT. These parts maintain 4.5V to 5.5V supply voltage compatibility and are recommended for designs requiring direct electrical equivalence. All are ROHS3 compliant with MSL 1 rating.

CY74FCT16952CTPACT is an Obsolete status part with identical electrical parameters but should be considered only when supply chain availability of Active alternatives is constrained.

For Low Voltage Applications:

SN74LVCH16543ADGGR operates at 1.65V to 3.6V supply voltage and is classified as a functional equivalent for low-power system designs. This part maintains identical logic architecture and package geometry but features reduced output current specifications (24mA high and low versus 32mA/64mA). Active product status ensures long-term availability.

Compliance and Certification:

All substitute parts carry ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's environmental and regulatory qualifications. Selection should prioritize Active product status parts for new designs and long-term production support.

Frequently Asked Questions (FAQ)

Q: Can SN74ABT16543DGGR directly replace CY74FCT16543ATPACT in existing designs?

A: Yes. SN74ABT16543DGGR maintains identical electrical specifications including 4.5V to 5.5V supply voltage, 32mA/64mA output current, and 56-TFSOP package geometry. Both parts are ROHS3 compliant with MSL 1 rating. The primary difference is product status: SN74ABT16543DGGR is Active while CY74FCT16543ATPACT is Obsolete.

Q: What is the difference between the 5.5V supply group and SN74LVCH16543ADGGR?

A: The 5.5V supply group (SN74ABT16543DGGR, SN74ABT16470DGGR, SN74ABT16646DGGR, SN74ABT16952DGGR) operates at 4.5V to 5.5V and delivers 32mA/64mA output current. SN74LVCH16543ADGGR operates at reduced voltage (1.65V to 3.6V) with lower output current (24mA both high and low). Selection depends on system voltage requirements and load current specifications.

Q: Are all substitute parts available in the same packaging?

A: Yes. All substitute parts use the 56-TFSOP package (0.240", 6.10mm Width) with identical pin count and geometry, ensuring mechanical interchangeability on PCB layouts designed for the original CY74FCT16543ATPACT.

Q: Which substitute part should be selected for new designs?

A: For 5.5V supply voltage systems, SN74ABT16543DGGR, SN74ABT16470DGGR, SN74ABT16646DGGR, or SN74ABT16952DGGR are recommended due to Active product status, ensuring long-term manufacturing support and supply chain availability. For low-voltage applications, SN74LVCH16543ADGGR is the appropriate selection.

Q: Do all parts meet the same environmental and compliance standards?

A: Yes. All substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's regulatory qualifications for industrial and commercial applications.

Q: What is the significance of product status in part selection?

A: Active product status indicates ongoing manufacturing and supply chain support. Obsolete parts (CY74FCT16543ATPACT and CY74FCT16952CTPACT) are no longer actively produced. For new designs and long-term production, Active status parts ensure availability and reduce supply chain risk.

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