CY74FCT16646CTPVC Equivalent & Substitute Parts

Part Overview

The CY74FCT16646CTPVC 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 operates at 4.5V to 5.5V supply voltage with output currents of 32mA (high) and 64mA (low), designed for surface mount applications across industrial temperature ranges (-40°C to 85°C).

The CY74FCT16646CTPVC is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain reliability, and support long-term product availability for legacy systems and new designs requiring compatible functionality.

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

Substitute parts for the CY74FCT16646CTPVC are categorized based on strict electrical and mechanical compatibility criteria:

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-BSSOP (0.295", 7.50mm Width)
Mounting Type: Surface Mount
Operating Temperature: -40°C ~ 85°C (TA)

Voltage Supply Classification:

5.5V Series (Direct Parametric Equivalents): Parts operating at 4.5V ~ 5.5V supply voltage with identical output current specifications (32mA high, 64mA low). These include CY74FCT and SN74ABT series variants.
Low-Voltage Alternative (MFR Recommended): SN74LVC16646ADLR operates at 1.65V ~ 3.6V supply voltage with reduced output current (24mA high and low). This part is recommended for applications requiring lower voltage operation and is currently in active production status.

All substitute parts maintain identical package geometry, pin count, and functional logic configuration, ensuring mechanical and electrical compatibility within their respective voltage domains.

Parameter Comparison

Part Number	Series	Voltage Supply	Current Output (H/L)	Product Status	Packaging	Inventory
CY74FCT16646CTPVC	74FCT	4.5V ~ 5.5V	32mA / 64mA	Obsolete	Tube	827 Pcs
SN74LVC16646ADLR	74LVC	1.65V ~ 3.6V	24mA / 24mA	Active	Tape & Reel	717 Pcs
CY74FCT16652ATPVC	74FCT	4.5V ~ 5.5V	32mA / 64mA	Obsolete	Tube	2144 Pcs
CY74FCT16543CTPVC	74FCT	4.5V ~ 5.5V	32mA / 64mA	Obsolete	Tube	1310 Pcs
CY74FCT16646ATPVC	74FCT	4.5V ~ 5.5V	32mA / 64mA	Obsolete	Not Specified	863 Pcs
CY74FCT16652CTPVC	74FCT	4.5V ~ 5.5V	32mA / 64mA	Obsolete	Tube	1250 Pcs
CY74FCT16952ATPVC	74FCT	4.5V ~ 5.5V	32mA / 64mA	Obsolete	Tube	1364 Pcs
SN74ABT16470DL	74ABT	4.5V ~ 5.5V	32mA / 64mA	Active	Tube	1027 Pcs
SN74ABT16543DL	74ABT	4.5V ~ 5.5V	32mA / 64mA	Active	Tube	1900 Pcs
SN74ABT16646DL	74ABT	4.5V ~ 5.5V	32mA / 64mA	Active	Tube	3080 Pcs
SN74ABT16652DL	74ABT	4.5V ~ 5.5V	32mA / 64mA	Active	Tube	846 Pcs

Engineering Selection Recommendations

For 5.5V Supply Voltage Applications:

Active production alternatives in the 74ABT series provide long-term supply assurance. SN74ABT16646DL offers the highest inventory availability (3080 Pcs) with identical electrical specifications and active product status. SN74ABT16543DL and SN74ABT16652DL provide additional options with substantial stock levels (1900 Pcs and 846 Pcs respectively). These parts are ROHS3 compliant and maintain MSL 1 rating.

For Low-Voltage Applications (1.65V ~ 3.6V):

SN74LVC16646ADLR is the manufacturer-recommended substitute for designs requiring reduced supply voltage operation. This part maintains active production status and ROHS3 compliance. Output current specifications differ (24mA symmetric versus 32mA/64mA asymmetric), requiring verification against load requirements. Packaging format is Tape & Reel (TR) rather than Tube.

For Obsolete Part Replacement:

When replacing CY74FCT16646CTPVC in existing designs, SN74ABT16646DL provides direct parametric equivalence with active product status. All 74ABT series alternatives maintain identical voltage supply range, output current ratings, and package geometry.

Frequently Asked Questions (FAQ)

Q: Can SN74LVC16646ADLR directly replace CY74FCT16646CTPVC?

A: SN74LVC16646ADLR is electrically compatible at the functional level but operates at a different voltage range (1.65V ~ 3.6V versus 4.5V ~ 5.5V). Direct substitution requires verification that your system can operate at the lower voltage. Output current specifications also differ (24mA symmetric versus 32mA/64mA). Use only if your application supports 3.6V maximum supply voltage and 24mA output current requirements.

Q: What is the difference between 74FCT, 74ABT, and 74LVC series?

A: These represent different logic families with distinct electrical characteristics. 74FCT and 74ABT both operate at 4.5V ~ 5.5V with identical output current ratings (32mA/64mA). 74LVC operates at lower voltage (1.65V ~ 3.6V) with reduced output current (24mA). All maintain the same functional logic and package geometry for the specified part numbers.

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 CY74FCT16646CTPVC specifications.

Q: Does packaging format affect compatibility?

A: Packaging format (Tube versus Tape & Reel) affects handling and storage but not electrical or mechanical compatibility. SN74LVC16646ADLR is supplied in Tape & Reel format while most 74ABT alternatives are supplied in Tube format. Verify packaging requirements for your assembly process.

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

A: SN74ABT16646DL provides the highest inventory level (3080 Pcs) with active product status, ensuring sustained availability for future production runs and design continuity.

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