74ACT16543SSCX Equivalent & Substitute Parts

Part Overview

The 74ACT16543SSCX is a non-inverting transceiver IC manufactured by onsemi, featuring 2 elements with 8 bits per element and 3-state output capability. This component 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	onsemi
Series	74ACT
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)
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 74ACT16543SSCX 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)
Mounting Type: Surface Mount
Package / Case: 56-BSSOP or compatible 56-pin SSOP variants

Substitute parts are categorized as follows:

Direct Manufacturer Equivalent: Parts with identical electrical specifications and package designation, differing only in manufacturer or packaging format (Tape & Reel vs. Tube).

Similar Manufacturer Equivalent: Parts with identical electrical specifications but alternative package variants (56-TSSOP vs. 56-SSOP), requiring PCB layout verification.

Parametric Equivalent: Parts from alternative manufacturers or series (74FCT, CY74FCT) that maintain all critical electrical parameters and package compatibility.

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Logic Type	Elements / Bits	Output Type	Current (mA)	Voltage (V)	Temp Range (°C)	Package	Packaging Format
74ACT16543SSCX	onsemi	74ACT	Obsolete	Non-Inverting	2 / 8	3-State	24, 24	4.5-5.5	-40 to 85	56-BSSOP	-
74ACT16543DLR	Texas Instruments	74ACT	Active	Non-Inverting	2 / 8	3-State	24, 24	4.5-5.5	-40 to 85	56-BSSOP	Tape & Reel
74ACT16543DGGR	Texas Instruments	74ACT	Active	Non-Inverting	2 / 8	3-State	24, 24	4.5-5.5	-40 to 85	56-TFSOP	Tape & Reel
74ACT16543DL	Texas Instruments	74ACT	Last Time Buy	Non-Inverting	2 / 8	3-State	24, 24	4.5-5.5	-40 to 85	56-BSSOP	Tube
74ACT16646DLR	Texas Instruments	74ACT	Active	Non-Inverting	2 / 8	3-State	24, 24	4.5-5.5	-40 to 85	56-BSSOP	Tape & Reel
74ACT16652DLR	Texas Instruments	74ACT	Active	Non-Inverting	2 / 8	3-State	24, 24	4.5-5.5	-40 to 85	56-BSSOP	Tape & Reel
74ACT16657DLR	Texas Instruments	74ACT	Active	Non-Inverting	2 / 8	3-State	24, 24	4.5-5.5	-40 to 85	56-BSSOP	Tape & Reel
74FCT162652ATPVCT	Texas Instruments	74FCT	Obsolete	Non-Inverting	2 / 8	3-State	24, 24	4.5-5.5	-40 to 85	56-BSSOP	-
CY74FCT162543TPVCT	Texas Instruments	74FCT	Obsolete	Non-Inverting	2 / 8	3-State	24, 24	4.5-5.5	-40 to 85	56-BSSOP	-

Engineering Selection Recommendations

Primary Recommendation: 74ACT16543DLR (Texas Instruments)

This part is the direct functional equivalent of the 74ACT16543SSCX with active product status. It maintains identical electrical specifications, package dimensions, and pin configuration. The part is available in Tape & Reel packaging and carries ROHS3 compliance certification, making it suitable for new designs and production environments requiring RoHS compliance.

Secondary Recommendation: 74ACT16646DLR or 74ACT16652DLR (Texas Instruments)

These parametric equivalents provide identical electrical performance and package compatibility. Both parts are active products with ROHS3 compliance. Selection between these alternatives depends on specific functional requirements within the transceiver architecture, as they represent different internal logic configurations while maintaining the same external electrical interface.

Alternative for Package Flexibility: 74ACT16543DGGR (Texas Instruments)

This part offers identical electrical specifications but uses the 56-TFSOP package (0.240" width) instead of the standard 56-BSSOP (0.295" width). This option is suitable only if PCB layout accommodates the narrower package footprint.

Legacy Compatibility: 74ACT16543DL (Texas Instruments)

This part maintains full electrical and functional equivalence but carries Last Time Buy status. It is available in Tube packaging and should be considered only when Tape & Reel format is unavailable or when existing inventory management requires tube-packaged components.

Obsolete Series Alternative: 74FCT162652ATPVCT or CY74FCT162543TPVCT

These parts are from the 74FCT series and carry obsolete product status. While they maintain all critical electrical parameters, they should be selected only when active 74ACT series alternatives are unavailable and existing inventory exists.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 74ACT16543SSCX with 74ACT16543DLR?

A: Yes. Both parts are identical in electrical specifications, pin configuration, and package dimensions (56-BSSOP). The primary difference is manufacturer (onsemi vs. Texas Instruments) and packaging format (unspecified vs. Tape & Reel). Functional substitution is direct with no circuit modifications required.

Q: What is the difference between 74ACT16543DLR and 74ACT16543DGGR?

A: Both parts are electrically identical and maintain the same pin configuration. The difference is package variant: 74ACT16543DLR uses 56-BSSOP (0.295" width), while 74ACT16543DGGR uses 56-TFSOP (0.240" width). The narrower TFSOP package requires verification that your PCB layout footprint accommodates the reduced width. Pin spacing and electrical performance remain unchanged.

Q: Why are 74ACT16646DLR and 74ACT16652DLR listed as substitutes if they have different part numbers?

A: These parts are parametric equivalents, meaning they maintain identical electrical specifications, output characteristics, and package compatibility. The different part numbers reflect variations in internal logic configuration or functional behavior within the transceiver architecture. They are suitable substitutes when the specific functional variant is compatible with your application requirements.

Q: Is 74FCT162652ATPVCT a suitable replacement?

A: 74FCT162652ATPVCT maintains all critical electrical parameters and package compatibility. However, it carries obsolete product status. Use this part only if active 74ACT series alternatives are unavailable and existing inventory is accessible. For new designs, prioritize active status parts such as 74ACT16543DLR.

Q: What does ROHS3 compliance mean for component selection?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. If your application or end-market requires RoHS compliance, select parts explicitly marked as ROHS3 Compliant. The 74ACT16543DLR, 74ACT16646DLR, 74ACT16652DLR, and 74ACT16657DLR all carry this certification.

Q: Can I use parts from different manufacturers interchangeably?

A: Yes, provided all electrical specifications, pin configurations, and package dimensions are identical. The 74ACT16543DLR (Texas Instruments) is a direct equivalent to the 74ACT16543SSCX (onsemi). Both maintain the same voltage supply range (4.5V-5.5V), output current (24mA), operating temperature range (-40°C to 85°C), and 56-BSSOP package. No circuit modifications are required.

Q: What is the significance of product status (Active, Obsolete, Last Time Buy)?

A: Product status indicates component availability and manufacturer support. Active parts are in full production with guaranteed long-term availability. Obsolete parts are no longer manufactured; use existing inventory only. Last Time Buy parts are in final production phase with limited availability. For new designs, select Active status parts. For legacy system maintenance, Last Time Buy or Obsolete parts may be necessary if inventory exists.

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