74FCT16646ATPVCG4 Equivalent & Substitute Parts

Part Overview

The 74FCT16646ATPVCG4 is a non-inverting transceiver logic IC manufactured by Texas Instruments, featuring 2 elements with 8 bits per element and 3-state output capability. This component is classified as discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement.

The 74FCT16646ATPVCG4 operates within the 74FCT logic series and is housed in a 56-BSSOP surface mount package. Its discontinuation status necessitates identification of functionally equivalent alternatives that maintain electrical and mechanical compatibility for system integration.

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 74FCT16646ATPVCG4 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)

All substitute parts listed maintain identical electrical specifications and mechanical compatibility. Substitutes are grouped by product status: obsolete parts within the 74FCT series and active alternatives from the 74ABT series.

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Logic Type	Elements	Bits/Element	Output Type	Current High/Low (mA)	Supply Voltage	Temp Range (°C)	Package	RoHS	MSL	Inventory (Pcs)
74FCT16646ATPVCG4	Texas Instruments	74FCT	Discontinued	Transceiver, Non-Inverting	2	8	3-State	32, 64	4.5 ~ 5.5V	-40 ~ 85	56-BSSOP	ROHS3	1	854
CY74FCT16652ATPVC	Texas Instruments	74FCT	Obsolete	Transceiver, Non-Inverting	2	8	3-State	32, 64	4.5 ~ 5.5V	-40 ~ 85	56-BSSOP	ROHS3	1	2144
CY74FCT16543CTPVC	Texas Instruments	74FCT	Obsolete	Transceiver, Non-Inverting	2	8	3-State	32, 64	4.5 ~ 5.5V	-40 ~ 85	56-BSSOP	ROHS3	1	1310
CY74FCT16646ATPVC	Texas Instruments	74FCT	Obsolete	Transceiver, Non-Inverting	2	8	3-State	32, 64	4.5 ~ 5.5V	-40 ~ 85	56-BSSOP	ROHS3	1	863
CY74FCT16646CTPVC	Texas Instruments	74FCT	Obsolete	Transceiver, Non-Inverting	2	8	3-State	32, 64	4.5 ~ 5.5V	-40 ~ 85	56-BSSOP	ROHS3	1	827
CY74FCT16652CTPVC	Texas Instruments	74FCT	Obsolete	Transceiver, Non-Inverting	2	8	3-State	32, 64	4.5 ~ 5.5V	-40 ~ 85	56-BSSOP	ROHS3	1	1250
CY74FCT16952ATPVC	Texas Instruments	74FCT	Obsolete	Transceiver, Non-Inverting	2	8	3-State	32, 64	4.5 ~ 5.5V	-40 ~ 85	56-BSSOP	ROHS3	1	1364
SN74ABT16470DL	Texas Instruments	74ABT	Active	Transceiver, Non-Inverting	2	8	3-State	32, 64	4.5 ~ 5.5V	-40 ~ 85	56-BSSOP	ROHS3	1	1027
SN74ABT16543DL	Texas Instruments	74ABT	Active	Transceiver, Non-Inverting	2	8	3-State	32, 64	4.5 ~ 5.5V	-40 ~ 85	56-BSSOP	ROHS3	1	1900
SN74ABT16646DL	Texas Instruments	74ABT	Active	Transceiver, Non-Inverting	2	8	3-State	32, 64	4.5 ~ 5.5V	-40 ~ 85	56-BSSOP	ROHS3	1	3080
SN74ABT16652DL	Texas Instruments	74ABT	Active	Transceiver, Non-Inverting	2	8	3-State	32, 64	4.5 ~ 5.5V	-40 ~ 85	56-BSSOP	ROHS3	1	846

Engineering Selection Recommendations

For applications currently using the 74FCT16646ATPVCG4, substitute selection depends on product lifecycle requirements and compliance status.

Obsolete 74FCT Series Alternatives: CY74FCT16652ATPVC, CY74FCT16543CTPVC, CY74FCT16646ATPVC, CY74FCT16646CTPVC, CY74FCT16652CTPVC, and CY74FCT16952ATPVC maintain identical electrical and mechanical specifications within the original 74FCT logic family. These parts are classified as obsolete and carry equivalent ROHS3 compliance and MSL ratings. Inventory availability ranges from 827 to 2144 units.

Active 74ABT Series Alternatives: SN74ABT16470DL, SN74ABT16543DL, SN74ABT16646DL, and SN74ABT16652DL are active products from the 74ABT logic series. These parts maintain all critical electrical parameters and mechanical compatibility while offering current product status and ongoing manufacturer support. The 74ABT series provides superior long-term availability and supply chain stability. Inventory availability ranges from 846 to 3080 units.

All substitute parts maintain ROHS3 compliance, MSL Level 1 (unlimited moisture sensitivity), and REACH unaffected status, ensuring regulatory alignment with the original component.

Frequently Asked Questions (FAQ)

Q: What determines if a part can substitute for the 74FCT16646ATPVCG4?

A: Substitution requires identical specifications across logic type (Transceiver, Non-Inverting), element count (2), bits per element (8), output type (3-State), output current (32mA high, 64mA low), supply voltage range (4.5V ~ 5.5V), operating temperature range (-40°C ~ 85°C), and package type (56-BSSOP). All listed substitutes meet these criteria.

Q: Can I use 74ABT series parts as direct replacements for 74FCT parts?

A: Yes. The SN74ABT16470DL, SN74ABT16543DL, SN74ABT16646DL, and SN74ABT16652DL maintain electrical and mechanical equivalence to the 74FCT16646ATPVCG4. The 74ABT series offers the advantage of active product status and ongoing manufacturer support.

Q: What is the difference between obsolete and active product status?

A: Obsolete parts (74FCT variants) are no longer manufactured but may be available from existing inventory. Active parts (74ABT variants) are currently produced by the manufacturer, ensuring long-term availability and supply chain continuity. For new designs or long-term production, active alternatives are recommended.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance status, matching the original 74FCT16646ATPVCG4 and meeting environmental regulatory requirements.

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

A: Yes. All substitute parts use the 56-BSSOP (0.295", 7.50mm Width) surface mount package, ensuring mechanical compatibility with existing PCB layouts and assembly processes.

Q: What is MSL Level 1, and why does it matter?

A: MSL (Moisture Sensitivity Level) 1 indicates unlimited shelf life with no moisture precautions required. All substitute parts carry this rating, eliminating moisture-related handling constraints during storage and assembly.

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