CY74FCT16646TPVC Equivalent & Substitute Parts

Part Overview

The CY74FCT16646TPVC is a non-inverting transceiver logic integrated circuit manufactured by Texas Instruments, classified within the 74FCT series. This device functions as a 2-element, 8-bit per element transceiver with 3-state output capability, housed in a 56-BSSOP surface mount package. The part is currently obsolete, necessitating identification of equivalent and substitute components for ongoing system support and new designs requiring compatible functionality.

Key Parameters

Parameter	Value
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)
Mounting Type	Surface Mount
Package / Case	56-BSSOP (0.295", 7.50mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution eligibility for the CY74FCT16646TPVC is determined by strict equivalence across the following critical parameters:

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)
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute parts are grouped into two categories: parametric equivalents within the 74FCT series (obsolete status) and active-status alternatives from the 74ABT series. All listed substitutes maintain identical electrical specifications and mechanical compatibility with the main part.

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Logic Type	Elements / Bits	Output Type	Current (High/Low)	Supply Voltage	Temp Range	Package	RoHS	Inventory
CY74FCT16646TPVC	Texas Instruments	74FCT	Obsolete	Transceiver, Non-Inverting	2 / 8	3-State	32mA, 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	56-BSSOP	ROHS3	770 Pcs
CY74FCT16652ATPVC	Texas Instruments	74FCT	Obsolete	Transceiver, Non-Inverting	2 / 8	3-State	32mA, 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	56-BSSOP	ROHS3	2144 Pcs
CY74FCT16543CTPVC	Texas Instruments	74FCT	Obsolete	Transceiver, Non-Inverting	2 / 8	3-State	32mA, 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	56-BSSOP	ROHS3	1310 Pcs
CY74FCT16646ATPVC	Texas Instruments	74FCT	Obsolete	Transceiver, Non-Inverting	2 / 8	3-State	32mA, 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	56-BSSOP	ROHS3	863 Pcs
CY74FCT16646CTPVC	Texas Instruments	74FCT	Obsolete	Transceiver, Non-Inverting	2 / 8	3-State	32mA, 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	56-BSSOP	ROHS3	827 Pcs
CY74FCT16652CTPVC	Texas Instruments	74FCT	Obsolete	Transceiver, Non-Inverting	2 / 8	3-State	32mA, 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	56-BSSOP	ROHS3	1250 Pcs
CY74FCT16952ATPVC	Texas Instruments	74FCT	Obsolete	Transceiver, Non-Inverting	2 / 8	3-State	32mA, 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	56-BSSOP	ROHS3	1364 Pcs
SN74ABT16470DL	Texas Instruments	74ABT	Active	Transceiver, Non-Inverting	2 / 8	3-State	32mA, 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	56-BSSOP	ROHS3	1027 Pcs
SN74ABT16543DL	Texas Instruments	74ABT	Active	Transceiver, Non-Inverting	2 / 8	3-State	32mA, 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	56-BSSOP	ROHS3	1900 Pcs
SN74ABT16646DL	Texas Instruments	74ABT	Active	Transceiver, Non-Inverting	2 / 8	3-State	32mA, 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	56-BSSOP	ROHS3	3080 Pcs
SN74ABT16652DL	Texas Instruments	74ABT	Active	Transceiver, Non-Inverting	2 / 8	3-State	32mA, 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	56-BSSOP	ROHS3	846 Pcs

Engineering Selection Recommendations

For applications currently using the obsolete CY74FCT16646TPVC, selection of a substitute part should prioritize active-status components to ensure long-term availability and supply chain continuity. The 74ABT series alternatives—specifically SN74ABT16646DL, SN74ABT16652DL, SN74ABT16543DL, and SN74ABT16470DL—maintain full electrical and mechanical compatibility while offering active product status from Texas Instruments.

All substitute parts listed meet ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements equivalent to the original part. The 56-BSSOP package footprint is identical across all substitutes, enabling direct board-level replacement without layout modification.

For legacy system maintenance where 74FCT series continuity is required, the parametric equivalents CY74FCT16646ATPVC, CY74FCT16646CTPVC, CY74FCT16652ATPVC, CY74FCT16652CTPVC, CY74FCT16543CTPVC, and CY74FCT16952ATPVC provide functional equivalence, though these parts retain obsolete status.

Frequently Asked Questions (FAQ)

Q: Can SN74ABT16646DL directly replace CY74FCT16646TPVC on existing PCBs?

A: Yes. Both parts share identical electrical specifications (supply voltage 4.5V–5.5V, output current 32mA/64mA, operating temperature -40°C to 85°C), identical logic function (2-element, 8-bit non-inverting transceiver with 3-state output), and identical 56-BSSOP package footprint. No circuit modification is required.

Q: What is the difference between CY74FCT16646TPVC and CY74FCT16646ATPVC?

A: Both parts are functionally and electrically identical. The difference lies in packaging designation: TPVC indicates the original packaging specification, while ATPVC represents an alternative packaging variant. All electrical parameters, pin configuration, and performance characteristics remain unchanged.

Q: Why are 74ABT series parts recommended over 74FCT equivalents?

A: The 74ABT series parts (SN74ABT16646DL, SN74ABT16652DL, SN74ABT16543DL, SN74ABT16470DL) maintain active product status with Texas Instruments, ensuring continued availability, manufacturing support, and supply chain reliability. The 74FCT series, including all CY74FCT variants, are classified as obsolete and face potential discontinuation.

Q: Are there any electrical performance differences between 74FCT and 74ABT series substitutes?

A: No. All listed substitutes maintain identical electrical specifications: supply voltage range 4.5V–5.5V, output current capabilities 32mA (high) and 64mA (low), operating temperature range -40°C to 85°C, and 3-state output configuration. Functional behavior and timing characteristics are equivalent.

Q: Does the 56-BSSOP package remain consistent across all substitute parts?

A: Yes. All substitute parts use the 56-BSSOP (0.295", 7.50mm width) surface mount package. PCB footprint, solder pad layout, and mechanical dimensions are identical, enabling direct component substitution without board redesign.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts, including both 74FCT and 74ABT series alternatives, are ROHS3 compliant with MSL rating of 1 (unlimited moisture sensitivity level). Regulatory compliance is maintained across all substitutes.

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