74ACT16543MTDX Equivalent & Substitute Parts

Part Overview

The 74ACT16543MTDX is a non-inverting transceiver 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-TSSOP 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	74ACT16543MTDX
Manufacturer	onsemi
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-TFSOP (0.240", 6.10mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the 74ACT16543MTDX 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

Substitute parts are grouped into two categories:

Direct Package Equivalent (56-TSSOP): Parts maintaining identical package specifications to the original 74ACT16543MTDX, ensuring pin-for-pin compatibility without PCB layout modifications.

Functional Equivalent with Package Variation (56-SSOP): Parts meeting all electrical and functional parameters but housed in a 56-SSOP package (0.295", 7.50mm Width), requiring PCB footprint adjustment but maintaining electrical compatibility.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Bits/Element	Output Type	Current (mA)	Supply Voltage	Temp Range	Package	Product Status
74ACT16543MTDX	onsemi	Transceiver, Non-Inverting	2	8	3-State	24/24	4.5V ~ 5.5V	-40°C ~ 85°C	56-TSSOP	Obsolete
74ACT16543DGGR	Texas Instruments	Transceiver, Non-Inverting	2	8	3-State	24/24	4.5V ~ 5.5V	-40°C ~ 85°C	56-TSSOP	Active
74ACT16543DL	Texas Instruments	Transceiver, Non-Inverting	2	8	3-State	24/24	4.5V ~ 5.5V	-40°C ~ 85°C	56-SSOP	Last Time Buy
74ACT16543DLR	Texas Instruments	Transceiver, Non-Inverting	2	8	3-State	24/24	4.5V ~ 5.5V	-40°C ~ 85°C	56-SSOP	Active
74FCT162543ATPACT	Texas Instruments	Transceiver, Non-Inverting	2	8	3-State	24/24	4.5V ~ 5.5V	-40°C ~ 85°C	56-TSSOP	Obsolete
74FCT162646CTPACT	Cypress Semiconductor Corp	Transceiver, Non-Inverting	2	8	3-State	24/24	4.5V ~ 5.5V	-40°C ~ 85°C	56-TSSOP	Active
74FCT162652CTPACT	Texas Instruments	Transceiver, Non-Inverting	2	8	3-State	24/24	4.5V ~ 5.5V	-40°C ~ 85°C	56-TSSOP	Obsolete

Engineering Selection Recommendations

Primary Recommendation - Direct Package Equivalent: The 74ACT16543DGGR (Texas Instruments, Active status) is the preferred substitute for the 74ACT16543MTDX. This part maintains identical package specifications (56-TSSOP), electrical parameters, and operating characteristics while offering active product status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). No PCB layout modifications are required.

Secondary Recommendation - Package Variant: The 74ACT16543DLR (Texas Instruments, Active status) provides functional equivalence with a package variation (56-SSOP). This part is actively supported and ROHS3 compliant, making it suitable for new designs where PCB footprint adjustment is acceptable. The 74ACT16543DL (Last Time Buy status) offers the same electrical and functional characteristics but with limited procurement availability.

Alternative Equivalent - 56-TSSOP Package: The 74FCT162646CTPACT (Cypress Semiconductor Corp, Active status) maintains the 56-TSSOP package and all critical electrical parameters. This part is actively manufactured and represents a viable long-term substitute.

Avoid for New Designs: Parts with Obsolete product status (74FCT162543ATPACT, 74FCT162652CTPACT) should not be selected for new designs due to limited availability and end-of-life status.

Frequently Asked Questions (FAQ)

Q: Can I directly replace the 74ACT16543MTDX with the 74ACT16543DGGR without PCB modifications? A: Yes. Both parts use the 56-TSSOP package with identical pin configurations, electrical specifications, and operating parameters. Direct substitution is possible without PCB layout changes.

Q: What is the difference between the 56-TSSOP and 56-SSOP packages? A: The 56-TSSOP package has a width of 0.240" (6.10mm), while the 56-SSOP package has a width of 0.295" (7.50mm). Both are surface-mount packages with 56 pins, but the different widths require different PCB footprints. Electrical functionality remains identical.

Q: Why is the 74ACT16543MTDX listed as obsolete? A: The original onsemi part is no longer in active production. Equivalent parts from other manufacturers, particularly Texas Instruments and Cypress Semiconductor, are available as active alternatives.

Q: Are all substitute parts ROHS3 compliant? A: The active substitute parts (74ACT16543DGGR, 74ACT16543DLR, 74FCT162646CTPACT) are ROHS3 compliant. The obsolete parts (74FCT162543ATPACT, 74FCT162652CTPACT) are also ROHS3 compliant but should not be selected for new designs.

Q: What is the moisture sensitivity level (MSL) for these parts? A: All listed parts have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

Q: Can I use a 74FCT series part as a substitute for a 74ACT series part? A: Yes, provided all electrical and functional parameters match. The 74FCT162543ATPACT and 74FCT162646CTPACT meet all critical specifications for the 74ACT16543MTDX. However, the 74FCT162543ATPACT is obsolete and should not be used for new designs.

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