74ABT16543CSSC Equivalent & Substitute Parts

Part Overview

The 74ABT16543CSSC is a non-inverting transceiver IC manufactured by onsemi, featuring 2 elements with 8 bits per element and 3-state output capability. This 56-SSOP surface mount device operates across a 4.5V to 5.5V supply range and is rated for -40°C to 85°C operating temperature. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring this functional class.

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	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)
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74ABT16543CSSC is determined by strict equivalence across the following critical parameters: logic type (non-inverting transceiver), element count (2), bits per element (8), output configuration (3-state), output current specifications (32mA high, 64mA low), supply voltage range (4.5V ~ 5.5V), operating temperature range (-40°C ~ 85°C), and surface mount packaging with 56-pin BSSOP footprint (0.295", 7.50mm width).

Substitute parts are grouped into two categories:

Direct Equivalents (Same Base Part Number): Parts sharing the 74ABT16543 base designation with identical electrical and mechanical specifications but different packaging formats or product status.

Parametric Equivalents (Different Base Part Numbers): Parts from the 74FCT and 74ABT series that maintain all critical electrical parameters and physical package dimensions, enabling functional interchangeability despite different part number designations.

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Package / Case	Voltage Supply	Output Current (High/Low)	Operating Temp	RoHS Status	Inventory
74ABT16543CSSC	onsemi	74ABT	Obsolete	56-BSSOP (0.295", 7.50mm)	4.5V ~ 5.5V	32mA / 64mA	-40°C ~ 85°C	REACH Unaffected	970 Pcs
SN74ABT16543DGGR	Texas Instruments	74ABT	Active	56-TFSOP (0.240", 6.10mm)	4.5V ~ 5.5V	32mA / 64mA	-40°C ~ 85°C	ROHS3 Compliant	2000 Pcs
SN74ABT16543DLR	Texas Instruments	74ABT	Active	56-BSSOP (0.295", 7.50mm)	4.5V ~ 5.5V	32mA / 64mA	-40°C ~ 85°C	ROHS3 Compliant	3200 Pcs
CY74FCT16543CTPVC	Texas Instruments	74FCT	Obsolete	56-BSSOP (0.295", 7.50mm)	4.5V ~ 5.5V	32mA / 64mA	-40°C ~ 85°C	ROHS3 Compliant	1310 Pcs
CY74FCT16646ATPVC	Texas Instruments	74FCT	Obsolete	56-BSSOP (0.295", 7.50mm)	4.5V ~ 5.5V	32mA / 64mA	-40°C ~ 85°C	ROHS3 Compliant	863 Pcs
CY74FCT16646CTPVC	Texas Instruments	74FCT	Obsolete	56-BSSOP (0.295", 7.50mm)	4.5V ~ 5.5V	32mA / 64mA	-40°C ~ 85°C	ROHS3 Compliant	827 Pcs
CY74FCT16652ATPVC	Texas Instruments	74FCT	Obsolete	56-BSSOP (0.295", 7.50mm)	4.5V ~ 5.5V	32mA / 64mA	-40°C ~ 85°C	ROHS3 Compliant	2144 Pcs
CY74FCT16652CTPVC	Texas Instruments	74FCT	Obsolete	56-BSSOP (0.295", 7.50mm)	4.5V ~ 5.5V	32mA / 64mA	-40°C ~ 85°C	ROHS3 Compliant	1250 Pcs
CY74FCT16952ATPVC	Texas Instruments	74FCT	Obsolete	56-BSSOP (0.295", 7.50mm)	4.5V ~ 5.5V	32mA / 64mA	-40°C ~ 85°C	ROHS3 Compliant	1364 Pcs
SN74ABT16470DL	Texas Instruments	74ABT	Active	56-BSSOP (0.295", 7.50mm)	4.5V ~ 5.5V	32mA / 64mA	-40°C ~ 85°C	ROHS3 Compliant	1027 Pcs
SN74ABT16543DL	Texas Instruments	74ABT	Active	56-BSSOP (0.295", 7.50mm)	4.5V ~ 5.5V	32mA / 64mA	-40°C ~ 85°C	ROHS3 Compliant	1900 Pcs

Engineering Selection Recommendations

For applications currently using the obsolete 74ABT16543CSSC, the following selection criteria apply:

Primary Recommendation: SN74ABT16543DLR (Texas Instruments) provides the highest compatibility as an active product with identical 56-BSSOP package footprint, matching all electrical specifications, and ROHS3 compliance. This part maintains pin-for-pin compatibility and requires no PCB redesign.

Alternative with Package Consideration: SN74ABT16543DGGR (Texas Instruments) is an active product with identical electrical specifications but uses a 56-TFSOP package (0.240", 6.10mm width) instead of the original 56-BSSOP (0.295", 7.50mm width). PCB layout modification is required for this substitution.

Parametric Equivalents: CY74FCT16543CTPVC, CY74FCT16646ATPVC, CY74FCT16646CTPVC, CY74FCT16652ATPVC, CY74FCT16652CTPVC, and CY74FCT16952ATPVC maintain all critical electrical parameters and 56-BSSOP package dimensions. These parts are obsolete but available in inventory. SN74ABT16470DL and SN74ABT16543DL are active products with identical specifications and packaging.

All substitute parts maintain REACH compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage conditions.

Frequently Asked Questions (FAQ)

Q: Can SN74ABT16543DGGR be used as a direct replacement for 74ABT16543CSSC?

A: SN74ABT16543DGGR is electrically equivalent with identical output current, voltage supply, and operating temperature specifications. However, it uses a 56-TFSOP package (0.240", 6.10mm width) versus the original 56-BSSOP (0.295", 7.50mm width). PCB footprint modification is required; pin-to-pin functionality is preserved.

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

A: Both series maintain identical electrical specifications for this application: 2-element, 8-bit non-inverting transceivers with 3-state output, 32mA/64mA output current, and 4.5V to 5.5V supply operation. The series designation reflects internal logic family differences that do not affect functional interchangeability for these specified parameters.

Q: Are all substitute parts ROHS3 compliant?

A: All Texas Instruments substitute parts listed are ROHS3 compliant. The original onsemi 74ABT16543CSSC is REACH Unaffected. All parts maintain MSL 1 (Unlimited) moisture sensitivity rating.

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

A: SN74ABT16543DLR (Texas Instruments, Active status) with 3200 Pcs inventory and SN74ABT16543DGGR (Texas Instruments, Active status) with 2000 Pcs inventory provide the highest availability as active products. Both are recommended for new designs requiring long-term supply assurance.

Q: Can parametric equivalents like CY74FCT16652CTPVC be used interchangeably?

A: Yes. CY74FCT16652CTPVC maintains all critical electrical parameters (output current, voltage supply, operating temperature, 3-state output) and identical 56-BSSOP package dimensions. Functional interchangeability is confirmed. Note this part is obsolete; inventory availability should be verified before design commitment.

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