74ABT16646CSSC Equivalent & Substitute Parts

Part Overview

The 74ABT16646CSSC is a non-inverting transceiver logic IC manufactured by onsemi, featuring 2 elements with 8 bits per element and 3-state output capability. This device operates within the 4.5V to 5.5V supply voltage range and is housed in a 56-SSOP package. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	74ABT16646CSSC
Manufacturer	onsemi
Series	74ABT
Logic Type	Transceiver, Non-Inverting
Number of Elements	2
Number of Bits per Element	8
Output Type	3-State
Current - Output High	32mA
Current - Output Low	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)
Supplier Device Package	56-SSOP
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74ABT16646CSSC 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)
Mounting Type: Surface Mount
Package / Case: 56-BSSOP (0.295", 7.50mm Width)
Supplier Device Package: 56-SSOP

Substitute parts are grouped into two categories: direct pin-compatible replacements from active manufacturers, and parametric equivalents that maintain identical electrical and mechanical specifications despite different base product numbers or series designations.

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Logic Type	Elements	Bits/Element	Output Type	I_out High/Low (mA)	V_supply (V)	Temp Range (°C)	Package	RoHS Status
74ABT16646CSSC	onsemi	74ABT	Obsolete	Transceiver, Non-Inverting	2	8	3-State	32/64	4.5~5.5	-40~85	56-BSSOP	REACH Unaffected
SN74ABT16646DGGR	Texas Instruments	74ABT	Active	Transceiver, Non-Inverting	2	8	3-State	32/64	4.5~5.5	-40~85	56-TFSOP	ROHS3 Compliant
SN74ABT16646DLR	Texas Instruments	74ABT	Active	Transceiver, Non-Inverting	2	8	3-State	32/64	4.5~5.5	-40~85	56-BSSOP	ROHS3 Compliant
CY74FCT16543CTPVC	Texas Instruments	74FCT	Obsolete	Transceiver, Non-Inverting	2	8	3-State	32/64	4.5~5.5	-40~85	56-BSSOP	ROHS3 Compliant
CY74FCT16646ATPVC	Texas Instruments	74FCT	Obsolete	Transceiver, Non-Inverting	2	8	3-State	32/64	4.5~5.5	-40~85	56-BSSOP	ROHS3 Compliant
CY74FCT16646CTPVC	Texas Instruments	74FCT	Obsolete	Transceiver, Non-Inverting	2	8	3-State	32/64	4.5~5.5	-40~85	56-BSSOP	ROHS3 Compliant
CY74FCT16652ATPVC	Texas Instruments	74FCT	Obsolete	Transceiver, Non-Inverting	2	8	3-State	32/64	4.5~5.5	-40~85	56-BSSOP	ROHS3 Compliant
CY74FCT16652CTPVC	Texas Instruments	74FCT	Obsolete	Transceiver, Non-Inverting	2	8	3-State	32/64	4.5~5.5	-40~85	56-BSSOP	ROHS3 Compliant
CY74FCT16952ATPVC	Texas Instruments	74FCT	Obsolete	Transceiver, Non-Inverting	2	8	3-State	32/64	4.5~5.5	-40~85	56-BSSOP	ROHS3 Compliant
SN74ABT16470DL	Texas Instruments	74ABT	Active	Transceiver, Non-Inverting	2	8	3-State	32/64	4.5~5.5	-40~85	56-BSSOP	ROHS3 Compliant
SN74ABT16543DL	Texas Instruments	74ABT	Active	Transceiver, Non-Inverting	2	8	3-State	32/64	4.5~5.5	-40~85	56-BSSOP	ROHS3 Compliant

Engineering Selection Recommendations

For new designs and long-term procurement, SN74ABT16646DLR (Texas Instruments) is the primary recommended substitute. This part maintains identical electrical specifications and package geometry (56-BSSOP) while offering active product status and ROHS3 compliance. The part is available in cut tape packaging and provides 2300 units in current inventory.

SN74ABT16646DGGR offers an alternative from the same manufacturer and series with active status and ROHS3 compliance, though it uses a 56-TFSOP package variant (0.240", 6.10mm width) rather than the original 56-BSSOP footprint. This substitution requires PCB layout verification for mechanical compatibility.

SN74ABT16470DL and SN74ABT16543DL are parametric equivalents within the active 74ABT series, maintaining all critical electrical and thermal specifications. Both are available in 56-BSSOP packages with ROHS3 compliance and active product status.

The 74FCT series parts (CY74FCT16543CTPVC, CY74FCT16646ATPVC, CY74FCT16646CTPVC, CY74FCT16652ATPVC, CY74FCT16652CTPVC, CY74FCT16952ATPVC) are parametric equivalents with identical electrical performance and package specifications. However, these parts carry obsolete product status. Selection of these alternatives should be limited to applications where existing inventory must be maintained or where active series alternatives are unavailable.

Frequently Asked Questions (FAQ)

Q: Can SN74ABT16646DGGR be used as a direct replacement for 74ABT16646CSSC?

A: SN74ABT16646DGGR is electrically equivalent and maintains the same 56-pin SSOP footprint family. However, it uses a 56-TFSOP package variant with a narrower width (6.10mm vs. 7.50mm). PCB layout compatibility must be verified before substitution.

Q: What is the difference between 56-BSSOP and 56-TFSOP packages?

A: Both are 56-pin SSOP packages. The 56-BSSOP has a body width of 0.295" (7.50mm), while the 56-TFSOP has a width of 0.240" (6.10mm). Pin pitch and lead configuration remain compatible, but PCB footprints differ. Verify layout compatibility before substitution.

Q: Why are the 74FCT series parts listed as obsolete?

A: The CY74FCT series parts are classified as obsolete by their manufacturers. While they maintain identical electrical and mechanical specifications to the 74ABT16646CSSC, they are not recommended for new designs. Use active series alternatives (74ABT) when possible.

Q: Are all substitute parts ROHS3 compliant?

A: The original 74ABT16646CSSC is REACH Unaffected. All Texas Instruments substitute parts listed are ROHS3 Compliant. Verify compliance requirements for your specific application before selection.

Q: Can I use SN74ABT16543DL or SN74ABT16470DL as substitutes?

A: Yes. Both parts are parametric equivalents with identical electrical specifications, output characteristics, and 56-BSSOP package geometry. They are active products with ROHS3 compliance and represent valid long-term alternatives.

Q: What packaging options are available for active substitutes?

A: SN74ABT16646DLR is available in cut tape (CT) packaging. SN74ABT16646DGGR is available in tape and reel (TR) packaging. SN74ABT16470DL and SN74ABT16543DL are available in tube packaging. Select based on your procurement and assembly requirements.

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