CY74FCT16543CTPVC Equivalent & Substitute Parts

Part Overview

The CY74FCT16543CTPVC 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-SSOP package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The device operates within a 4.5V to 5.5V supply voltage range and is suitable for applications requiring high-speed data buffering and signal routing in digital systems.

Key Parameters

Parameter	Value
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-BSSOP (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the CY74FCT16543CTPVC is determined by strict alignment of the following critical parameters:

Logic Type: Transceiver, Non-Inverting
Number of Elements: 2
Number of Bits per Element: 8
Output Type: 3-State
Package / Case: 56-BSSOP
Operating Temperature Range: -40°C ~ 85°C (TA)
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Substitute parts are grouped into two categories:

Category 1: Parametric Equivalents (Identical Electrical Specifications) Parts that maintain identical output current ratings (32mA, 64mA) and supply voltage range (4.5V ~ 5.5V). These include CY74FCT16652CTPVC, CY74FCT16646CTPVC, CY74FCT16952ATPVC, and the 74ABT series variants (SN74ABT16543DL, SN74ABT16646DL, SN74ABT16652DL, SN74ABT16470DL).

Category 2: Functional Equivalent with Reduced Supply Voltage (SN74LVCH16543ADLR) This part maintains the same logic architecture and package but operates at reduced voltage (1.65V ~ 3.6V) with lower output current (24mA, 24mA). This represents a functional substitute suitable for lower-voltage system designs.

Parameter Comparison

Part Number	Series	Status	Supply Voltage	Output Current (High, Low)	Package	Packaging Type
CY74FCT16543CTPVC	74FCT	Obsolete	4.5V ~ 5.5V	32mA, 64mA	56-BSSOP	Tube
SN74LVCH16543ADLR	74LVCH	Active	1.65V ~ 3.6V	24mA, 24mA	56-BSSOP	Tape & Reel (TR)
CY74FCT16652CTPVC	74FCT	Obsolete	4.5V ~ 5.5V	32mA, 64mA	56-BSSOP	Tube
CY74FCT16646CTPVC	74FCT	Obsolete	4.5V ~ 5.5V	32mA, 64mA	56-BSSOP	Tube
CY74FCT16952ATPVC	74FCT	Obsolete	4.5V ~ 5.5V	32mA, 64mA	56-BSSOP	Tube
SN74ABT16543DL	74ABT	Active	4.5V ~ 5.5V	32mA, 64mA	56-BSSOP	Tube
SN74ABT16646DL	74ABT	Active	4.5V ~ 5.5V	32mA, 64mA	56-BSSOP	Tube
SN74ABT16652DL	74ABT	Active	4.5V ~ 5.5V	32mA, 64mA	56-BSSOP	Tube
SN74ABT16470DL	74ABT	Active	4.5V ~ 5.5V	32mA, 64mA	56-BSSOP	Tube

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance): SN74ABT16543DL is the recommended primary substitute. It maintains identical electrical specifications (4.5V ~ 5.5V supply, 32mA/64mA output current) and is classified as Active product status, ensuring long-term availability and manufacturing support. Both parts are ROHS3 compliant with MSL 1 rating.

For Parametric Equivalents Within 74FCT Series: CY74FCT16652CTPVC, CY74FCT16646CTPVC, and CY74FCT16952ATPVC provide identical electrical performance and package compatibility. These remain obsolete but are available in current inventory (1,250, 827, and 1,364 units respectively).

For Lower-Voltage System Integration: SN74LVCH16543ADLR serves as a functional equivalent for designs operating at reduced supply voltages (1.65V ~ 3.6V). This part is Active status and available in Tape & Reel packaging. Output current specifications differ (24mA, 24mA), requiring circuit-level validation for current-limited applications.

For Extended Availability: SN74ABT16646DL and SN74ABT16652DL offer the highest inventory levels (3,080 and 846 units respectively) among Active parts, providing supply chain flexibility for high-volume procurement.

Frequently Asked Questions (FAQ)

Q: Can SN74LVCH16543ADLR replace CY74FCT16543CTPVC in all applications? A: SN74LVCH16543ADLR maintains the same logic architecture and package but operates at different voltage and current specifications. It is suitable only for systems designed for 1.65V to 3.6V supply operation. Applications requiring 4.5V to 5.5V supply must use parts from the 74FCT or 74ABT series.

Q: What is the difference between Tube and Tape & Reel packaging? A: Tube packaging is suitable for lower-volume applications and manual assembly. Tape & Reel packaging is optimized for automated pick-and-place assembly in high-volume production. Both formats contain identical die and electrical performance.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original CY74FCT16543CTPVC specifications.

Q: Why is CY74FCT16543CTPVC classified as obsolete? A: The 74FCT series represents an earlier generation of transceiver logic. Texas Instruments has transitioned manufacturing focus to the 74ABT and 74LVCH series, which offer improved performance characteristics and extended product lifecycle support.

Q: Can I use CY74FCT16652CTPVC as a direct substitute? A: CY74FCT16652CTPVC is a parametric equivalent with identical electrical specifications and package. However, it remains obsolete. For new designs, SN74ABT16543DL or SN74ABT16652DL are preferred due to Active product status.

Q: What inventory considerations should guide part selection? A: SN74ABT16543DL (1,900 units), SN74ABT16646DL (3,080 units), and SN74LVCH16543ADLR (969 units) offer the most robust inventory levels among Active parts, supporting both immediate and sustained procurement requirements.

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