74ACTQ16646SSC Equivalent & Substitute Parts

Part Overview

The 74ACTQ16646SSC is a non-inverting transceiver logic IC manufactured by onsemi, featuring 2 elements with 8 bits per element and 3-state output capability in a 56-SSOP package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part operates within a 4.5V to 5.5V supply voltage range and supports operating temperatures from -40°C to 85°C.

Key Parameters

Parameter	Specification
Logic Type	Transceiver, Non-Inverting
Number of Elements	2
Number of Bits per Element	8
Output Type	3-State
Current - Output High, Low	24mA, 24mA
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
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74ACTQ16646SSC 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: 24mA, 24mA
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

Substitute parts are grouped into two categories: direct parametric equivalents from active or last-time-buy product lines, and functionally equivalent alternatives from different manufacturers. All listed substitutes maintain identical electrical specifications and physical packaging requirements.

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Logic Type	Elements	Bits/Element	Output Type	I/O Current (mA)	Supply Voltage	Temp Range	Package	RoHS Status
74ACTQ16646SSC	onsemi	74ACTQ	Obsolete	Non-Inverting	2	8	3-State	24/24	4.5-5.5V	-40 to 85°C	56-BSSOP	REACH Unaffected
74ACT16646DLR	Texas Instruments	74ACT	Active	Non-Inverting	2	8	3-State	24/24	4.5-5.5V	-40 to 85°C	56-BSSOP	ROHS3 Compliant
74ACT16646DL	Texas Instruments	74ACT	Last Time Buy	Non-Inverting	2	8	3-State	24/24	4.5-5.5V	-40 to 85°C	56-BSSOP	ROHS3 Compliant
74ACT16543DL	Texas Instruments	74ACT	Last Time Buy	Non-Inverting	2	8	3-State	24/24	4.5-5.5V	-40 to 85°C	56-BSSOP	ROHS3 Compliant
74ACT16651DL	Texas Instruments	74ACT	Active	Non-Inverting	2	8	3-State	24/24	4.5-5.5V	-40 to 85°C	56-BSSOP	ROHS3 Compliant
74ACT16652DL	Texas Instruments	74ACT	Last Time Buy	Non-Inverting	2	8	3-State	24/24	4.5-5.5V	-40 to 85°C	56-BSSOP	ROHS3 Compliant
CY74FCT162543CTPVC	Texas Instruments	74FCT	Obsolete	Non-Inverting	2	8	3-State	24/24	4.5-5.5V	-40 to 85°C	56-BSSOP	ROHS3 Compliant
CY74FCT162543TPVC	Texas Instruments	74FCT	Obsolete	Non-Inverting	2	8	3-State	24/24	4.5-5.5V	-40 to 85°C	56-BSSOP	ROHS3 Compliant
CY74FCT162646ATPVC	Texas Instruments	74FCT	Obsolete	Non-Inverting	2	8	3-State	24/24	4.5-5.5V	-40 to 85°C	56-BSSOP	ROHS3 Compliant
CY74FCT162646CTPVC	Texas Instruments	74FCT	Obsolete	Non-Inverting	2	8	3-State	24/24	4.5-5.5V	-40 to 85°C	56-BSSOP	ROHS3 Compliant
CY74FCT162652ATPVC	Texas Instruments	74FCT	Obsolete	Non-Inverting	2	8	3-State	24/24	4.5-5.5V	-40 to 85°C	56-BSSOP	ROHS3 Compliant

Engineering Selection Recommendations

For new designs and procurement, 74ACT16646DLR from Texas Instruments is the primary recommended substitute. This part maintains active product status, ensuring long-term availability and supply chain stability. It is ROHS3 compliant and carries identical electrical and mechanical specifications to the 74ACTQ16646SSC.

For applications requiring immediate availability with established inventory, 74ACT16646DL offers parametric equivalence with last-time-buy status. This part is suitable for legacy system support and maintenance applications.

The 74ACT16651DL and 74ACT16652DL variants provide functional equivalence and active or last-time-buy status, offering alternative sourcing options within the same logic family.

Parts from the 74FCT series (CY74FCT162543CTPVC, CY74FCT162646ATPVC, CY74FCT162646CTPVC, CY74FCT162652ATPVC) are classified as obsolete and should be considered only when legacy system compatibility is a specific requirement. These parts maintain full parametric equivalence but carry obsolete product status.

Frequently Asked Questions (FAQ)

Q: Can 74ACT16646DLR be used as a direct replacement for 74ACTQ16646SSC?

A: Yes. Both parts share identical electrical specifications (2 elements, 8 bits per element, 3-state output, 24mA output current, 4.5-5.5V supply, -40 to 85°C operating range) and the same 56-BSSOP package. The primary difference is product status: 74ACT16646DLR is active, while 74ACTQ16646SSC is obsolete.

Q: What is the difference between 74ACT16646DL and 74ACT16646DLR?

A: Both parts are parametrically equivalent. The primary distinction is packaging: 74ACT16646DL is supplied in Tube packaging, while 74ACT16646DLR is supplied in Tape & Reel (TR) format. Electrical and mechanical specifications are identical.

Q: Are the 74FCT series parts suitable for new designs?

A: The 74FCT series parts listed (CY74FCT162543CTPVC, CY74FCT162646ATPVC, CY74FCT162646CTPVC, CY74FCT162652ATPVC) are classified as obsolete. While they maintain full parametric equivalence, they are not recommended for new designs. Use active or last-time-buy alternatives from the 74ACT series instead.

Q: What packaging options are available for substitute parts?

A: All substitute parts use the 56-BSSOP (0.295", 7.50mm Width) surface-mount package, maintaining mechanical compatibility with the original 74ACTQ16646SSC. Packaging format options include Tube and Tape & Reel (TR), which do not affect electrical performance or PCB mounting.

Q: Are all substitute parts ROHS3 compliant?

A: All Texas Instruments substitute parts listed are ROHS3 compliant. The original 74ACTQ16646SSC carries REACH Unaffected status. All parts maintain MSL 1 (Unlimited) moisture sensitivity classification.

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

A: 74ACT16646DLR from Texas Instruments is the recommended choice for long-term availability, as it maintains active product status. This ensures continued manufacturing and supply chain support beyond last-time-buy windows.

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