CY74FCT16646ATPVC Equivalent & Substitute Parts

Part Overview

The CY74FCT16646ATPVC 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 CY74FCT16646ATPVC is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for legacy systems or 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 CY74FCT16646ATPVC are categorized based on strict electrical and mechanical compatibility criteria:

Parametric Equivalents (Full Compatibility): Parts maintaining identical electrical specifications including 4.5V to 5.5V supply voltage, 32mA/64mA output current ratings, 2 elements with 8 bits per element, 3-state output configuration, and 56-BSSOP package form factor. These parts are direct functional replacements with no design modifications required.

Manufacturer Recommended Substitute (Voltage Downgrade): The SN74LVC16646ADLR operates at reduced supply voltage (1.65V to 3.6V) with lower output current (24mA/24mA) but maintains identical logic configuration, element count, bit width, and package specifications. This part is suitable only for applications where lower voltage operation is acceptable.

Active Series Alternatives (Full Compatibility): Parts from the 74ABT series (SN74ABT16470DL, SN74ABT16543DL, SN74ABT16646DL, SN74ABT16652DL) provide full electrical and mechanical compatibility with active product status, ensuring long-term availability and supply chain stability.

All substitute parts share the following critical parameters with the main part:

56-BSSOP package configuration
Surface mount mounting type
2 elements, 8 bits per element architecture
3-state output capability
-40°C to 85°C operating temperature range
ROHS3 compliance and MSL 1 rating

Parameter Comparison

Part Number	Series	Status	Supply Voltage	Output Current (H/L)	Package	Inventory
CY74FCT16646ATPVC	74FCT	Obsolete	4.5V ~ 5.5V	32mA / 64mA	56-BSSOP	863 Pcs
SN74LVC16646ADLR	74LVC	Active	1.65V ~ 3.6V	24mA / 24mA	56-BSSOP	717 Pcs
CY74FCT16652ATPVC	74FCT	Obsolete	4.5V ~ 5.5V	32mA / 64mA	56-BSSOP	2144 Pcs
CY74FCT16543CTPVC	74FCT	Obsolete	4.5V ~ 5.5V	32mA / 64mA	56-BSSOP	1310 Pcs
CY74FCT16646CTPVC	74FCT	Obsolete	4.5V ~ 5.5V	32mA / 64mA	56-BSSOP	827 Pcs
CY74FCT16652CTPVC	74FCT	Obsolete	4.5V ~ 5.5V	32mA / 64mA	56-BSSOP	1250 Pcs
CY74FCT16952ATPVC	74FCT	Obsolete	4.5V ~ 5.5V	32mA / 64mA	56-BSSOP	1364 Pcs
SN74ABT16470DL	74ABT	Active	4.5V ~ 5.5V	32mA / 64mA	56-BSSOP	1027 Pcs
SN74ABT16543DL	74ABT	Active	4.5V ~ 5.5V	32mA / 64mA	56-BSSOP	1900 Pcs
SN74ABT16646DL	74ABT	Active	4.5V ~ 5.5V	32mA / 64mA	56-BSSOP	3080 Pcs
SN74ABT16652DL	74ABT	Active	4.5V ~ 5.5V	32mA / 64mA	56-BSSOP	846 Pcs

Engineering Selection Recommendations

For Direct Replacement (Obsolete to Active Migration): Select SN74ABT16646DL or SN74ABT16543DL from the active 74ABT series. These parts maintain full electrical and mechanical compatibility with the CY74FCT16646ATPVC while providing active product status, ensuring long-term supply chain availability and ROHS3 compliance certification.

For Parametric Equivalents Within 74FCT Series: CY74FCT16652ATPVC, CY74FCT16543CTPVC, CY74FCT16646CTPVC, CY74FCT16652CTPVC, and CY74FCT16952ATPVC provide identical electrical specifications and package configuration. These parts are suitable for applications where 74FCT series continuity is required, though all are classified as obsolete.

For Voltage-Reduced Applications: SN74LVC16646ADLR is the manufacturer-recommended substitute when system design permits operation at 1.65V to 3.6V supply voltage. This part is active and ROHS3 compliant but requires verification that reduced output current (24mA/24mA versus 32mA/64mA) meets application load requirements.

Supply Chain Considerations: SN74ABT16646DL offers the highest inventory availability (3080 Pcs) among active alternatives, supporting volume production requirements. All recommended substitutes maintain identical -40°C to 85°C operating temperature range and MSL 1 moisture sensitivity rating.

Frequently Asked Questions (FAQ)

Q: Can the SN74LVC16646ADLR directly replace the CY74FCT16646ATPVC in existing designs?

A: Direct replacement requires design verification. While both parts maintain identical logic configuration, element count, bit width, and 56-BSSOP package, the SN74LVC16646ADLR operates at 1.65V to 3.6V supply voltage with reduced output current (24mA/24mA) compared to the CY74FCT16646ATPVC (4.5V to 5.5V, 32mA/64mA). Substitution is valid only if the application operates within the lower voltage range and load current requirements do not exceed 24mA.

Q: What is the difference between CY74FCT16646ATPVC and CY74FCT16646CTPVC?

A: Both parts are electrically identical with matching supply voltage (4.5V to 5.5V), output current (32mA/64mA), and 56-BSSOP package specifications. The primary difference is packaging format: ATPVC uses Tape & Reel packaging while CTPVC uses Tube packaging. Selection depends on assembly process requirements and handling procedures.

Q: Are all 74ABT series alternatives fully compatible with the CY74FCT16646ATPVC?

A: Yes. SN74ABT16470DL, SN74ABT16543DL, SN74ABT16646DL, and SN74ABT16652DL maintain full electrical and mechanical compatibility, including 4.5V to 5.5V supply voltage, 32mA/64mA output current, 2 elements with 8 bits per element, 3-state output configuration, and 56-BSSOP package form factor. All are active products with ROHS3 compliance.

Q: Why are multiple CY74FCT variants listed as substitutes?

A: CY74FCT16652ATPVC, CY74FCT16543CTPVC, CY74FCT16646CTPVC, CY74FCT16652CTPVC, and CY74FCT16952ATPVC are parametric equivalents sharing identical electrical specifications and package configuration with the main part. These alternatives provide flexibility in sourcing from available inventory across the 74FCT series, though all are classified as obsolete.

Q: What compliance certifications apply to all substitute parts?

A: All listed substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the CY74FCT16646ATPVC specifications. REACH status is unaffected for all parts, and ECCN classification is EAR99 for all alternatives.

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

A: SN74ABT16646DL from the active 74ABT series provides the highest inventory availability (3080 Pcs) and active product status, ensuring sustained supply chain support and manufacturing continuity for new designs and production requirements.

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