74ACT16861DL Equivalent & Substitute Parts

Part Overview

The 74ACT16861DL is a non-inverting transceiver logic IC manufactured by Texas Instruments, configured as a 2-element, 10-bit per element device in a 56-SSOP surface mount package. This part operates across a 4.5V to 5.5V supply range with 3-state output capability and 24mA output current specifications. The 74ACT16861DL is designated as Last Time Buy, indicating discontinued production. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and legacy system support.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Series	74ACT
Logic Type	Transceiver, Non-Inverting
Number of Elements	2
Number of Bits per Element	10
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
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74ACT16861DL is determined by the following critical parameters: logic type (non-inverting transceiver), number of elements (2), output type (3-state), supply voltage range (4.5V ~ 5.5V), operating temperature range (-40°C ~ 85°C), package type (56-BSSOP), and output current capability (24mA). The number of bits per element is the primary differentiator among available substitutes.

Substitutes are grouped into two categories:

Direct Equivalent (Identical Bit Configuration): The 74ACT16861DLR maintains the 10-bit per element configuration with identical electrical and mechanical specifications. This part differs only in packaging format (Tape & Reel versus Tube) and product status (Active versus Last Time Buy).

Parametric Equivalents (Reduced Bit Configuration): Parts including 74ACT16652DL, 74ACT16543DL, 74ACT16646DL, and 74ACT16651DL operate with 8-bit per element configurations. The 74ACT16863DL provides a 9-bit per element alternative. All maintain identical supply voltage, operating temperature, output current, package dimensions, and 3-state output characteristics. These parts are suitable for applications where the reduced bit width is compatible with system requirements.

Cross-Series Alternatives: CY74FCT162543CTPVC, CY74FCT162543TPVC, CY74FCT162646ATPVC, and CY74FCT162646CTPVC represent the 74FCT series with 8-bit per element configurations. These parts share identical electrical specifications and package dimensions but carry Obsolete product status.

Parameter Comparison

Part Number	Manufacturer	Series	Bits per Element	Product Status	Packaging	Voltage Supply	Output Current (mA)	Package Type
74ACT16861DL	Texas Instruments	74ACT	10	Last Time Buy	Tube	4.5V ~ 5.5V	24, 24	56-BSSOP
74ACT16861DLR	Texas Instruments	74ACT	10	Active	Tape & Reel	4.5V ~ 5.5V	24, 24	56-BSSOP
74ACT16652DL	Texas Instruments	74ACT	8	Last Time Buy	Tube	4.5V ~ 5.5V	24, 24	56-BSSOP
74ACT16543DL	Texas Instruments	74ACT	8	Last Time Buy	Tube	4.5V ~ 5.5V	24, 24	56-BSSOP
74ACT16646DL	Texas Instruments	74ACT	8	Last Time Buy	Tube	4.5V ~ 5.5V	24, 24	56-BSSOP
74ACT16651DL	Texas Instruments	74ACT	8	Active	Tube	4.5V ~ 5.5V	24, 24	56-BSSOP
74ACT16863DL	Texas Instruments	74ACT	9	Active	Tube	4.5V ~ 5.5V	24, 24	56-BSSOP
CY74FCT162543CTPVC	Texas Instruments	74FCT	8	Obsolete	Tube	4.5V ~ 5.5V	24, 24	56-BSSOP
CY74FCT162543TPVC	Texas Instruments	74FCT	8	Obsolete	-	4.5V ~ 5.5V	24, 24	56-BSSOP
CY74FCT162646ATPVC	Texas Instruments	74FCT	8	Obsolete	-	4.5V ~ 5.5V	24, 24	56-BSSOP
CY74FCT162646CTPVC	Texas Instruments	74FCT	8	Obsolete	-	4.5V ~ 5.5V	24, 24	56-BSSOP

Engineering Selection Recommendations

Primary Recommendation: The 74ACT16861DLR is the direct equivalent for the 74ACT16861DL. Both parts maintain identical electrical specifications, bit configuration, and package dimensions. The 74ACT16861DLR carries Active product status, ensuring long-term availability and supply chain continuity. The only distinction is packaging format: Tape & Reel versus Tube. Selection between these formats depends on assembly process requirements and volume considerations.

Secondary Recommendations for Reduced Bit Width Applications: When system design permits operation with reduced bit width, the 74ACT16651DL and 74ACT16863DL are preferred alternatives due to Active product status. The 74ACT16651DL operates with 8-bit per element configuration, while the 74ACT16863DL provides 9-bit per element operation. Both maintain identical supply voltage, operating temperature range, output current specifications, and 56-BSSOP package dimensions as the original part.

Alternative Selections: The 74ACT16652DL, 74ACT16543DL, and 74ACT16646DL are functionally equivalent 8-bit per element alternatives but carry Last Time Buy status, indicating limited future availability. These parts are suitable only when immediate component procurement is feasible and long-term supply is not a requirement.

Cross-Series Alternatives: The CY74FCT162543CTPVC, CY74FCT162543TPVC, CY74FCT162646ATPVC, and CY74FCT162646CTPVC parts from the 74FCT series are electrically compatible but designated as Obsolete. These parts should be selected only when existing inventory is available and no alternative options meet design requirements.

All recommended substitutes maintain ROHS3 compliance, MSL Level 1 rating, and identical mechanical package specifications (56-BSSOP, 0.295" width, 7.50mm).

Frequently Asked Questions (FAQ)

Q: Can the 74ACT16861DLR directly replace the 74ACT16861DL?

A: Yes. The 74ACT16861DLR is electrically and mechanically identical to the 74ACT16861DL. Both parts feature 10-bit per element configuration, identical supply voltage range (4.5V ~ 5.5V), operating temperature (-40°C ~ 85°C), output current (24mA), and 56-BSSOP package dimensions. The difference is packaging format: the DLR variant uses Tape & Reel packaging while the DL variant uses Tube packaging. Selection depends on assembly process requirements.

Q: What is the difference between 10-bit and 8-bit per element configurations?

A: The bit width per element determines the number of parallel data lines the transceiver can handle. The 74ACT16861DL processes 10 bits per element across 2 elements, while 8-bit alternatives such as the 74ACT16646DL process 8 bits per element. Substitution with reduced bit width is only valid if the application circuit design accommodates fewer data lines.

Q: Are the 74FCT series parts suitable replacements?

A: The CY74FCT162543CTPVC, CY74FCT162543TPVC, CY74FCT162646ATPVC, and CY74FCT162646CTPVC parts maintain identical electrical specifications and package dimensions. However, all 74FCT series alternatives carry Obsolete product status. These parts should be selected only when existing inventory is available and no Active status alternatives meet design requirements.

Q: What does Last Time Buy status mean?

A: Last Time Buy indicates the manufacturer has discontinued production and will not accept new orders after a specified date. Existing inventory may be available from distributors, but long-term supply cannot be guaranteed. For new designs or production runs requiring extended component availability, selection of Active status parts such as the 74ACT16861DLR, 74ACT16651DL, or 74ACT16863DL is recommended.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All parts listed in this reference maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with modern manufacturing processes and environmental regulations.

Q: Does packaging format affect electrical performance?

A: No. Tube and Tape & Reel packaging formats contain identical die and electrical specifications. Packaging selection is determined by assembly process requirements: Tube packaging is typically used for manual or lower-volume assembly, while Tape & Reel packaging is standard for automated pick-and-place assembly systems.

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