74ACT16651DLRG4 Equivalent & Substitute Parts

Part Overview

The 74ACT16651DLRG4 is a non-inverting transceiver IC manufactured by Texas Instruments, 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-BSSOP surface mount package. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Manufacturer Part Number	74ACT16651DLRG4
Manufacturer	Texas Instruments
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)
Package / Case	56-BSSOP (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 74ACT16651DLRG4 are qualified based on the following critical parameters that determine functional and mechanical compatibility:

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-BSSOP (0.295", 7.50mm Width)
Mounting Type: Surface Mount

All substitute parts listed maintain identical electrical specifications and physical packaging, ensuring direct functional replacement capability. Substitutes are categorized by product status: active parts provide long-term availability, while obsolete alternatives serve as interim solutions for legacy system support.

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Logic Type	Elements	Bits/Element	Output Type	Current (mA)	Supply Voltage	Temp Range	Package	Packaging Type	Inventory (Pcs)
74ACT16651DLRG4	Texas Instruments	74ACT	Obsolete	Transceiver, Non-Inverting	2	8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	56-BSSOP	Tube	791
74ACT16543DLR	Texas Instruments	74ACT	Active	Transceiver, Non-Inverting	2	8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	56-BSSOP	Tape & Reel	1871
74ACT16646DLR	Texas Instruments	74ACT	Active	Transceiver, Non-Inverting	2	8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	56-BSSOP	Tape & Reel	2200
74ACT16652DLR	Texas Instruments	74ACT	Active	Transceiver, Non-Inverting	2	8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	56-BSSOP	Tape & Reel	931
74ACT16657DLR	Texas Instruments	74ACT	Active	Transceiver, Non-Inverting	2	8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	56-BSSOP	Tape & Reel	768
74FCT162652ATPVCT	Texas Instruments	74FCT	Obsolete	Transceiver, Non-Inverting	2	8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	56-BSSOP	Tube	830
CY74FCT162543TPVCT	Texas Instruments	74FCT	Obsolete	Transceiver, Non-Inverting	2	8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	56-BSSOP	Tube	1018
74ACT16651DL	Texas Instruments	74ACT	Active	Transceiver, Non-Inverting	2	8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	56-BSSOP	Tube	1048

Engineering Selection Recommendations

For new designs and long-term system support, prioritize active product status parts. The 74ACT16646DLR offers the highest inventory availability (2200 pcs) with active product status and Tape & Reel packaging suitable for automated assembly. The 74ACT16543DLR and 74ACT16652DLR provide alternative active options with substantial inventory levels.

For legacy system maintenance where the original 74ACT16651DLRG4 is unavailable, the 74ACT16651DL serves as a direct base part number equivalent with active status, differing only in packaging format (Tube instead of the original specification).

All listed substitutes maintain ROHS3 compliance and MSL Level 1 rating, ensuring regulatory and environmental compatibility with the original specification. The 74FCT162652ATPVCT and CY74FCT162543TPVCT are obsolete alternatives and should be considered only when active parts are unavailable.

Frequently Asked Questions (FAQ)

Q: Can 74ACT16543DLR directly replace 74ACT16651DLRG4 in existing designs?

A: Yes. Both parts share identical electrical specifications (2 elements, 8 bits per element, 3-state output, 24mA drive current, 4.5V–5.5V supply) and the same 56-BSSOP package. The primary difference is packaging format (Tape & Reel vs. Tube) and product status (Active vs. Obsolete).

Q: What is the difference between 74ACT16651DLRG4 and 74ACT16651DL?

A: These parts are functionally identical with the same base part number (74ACT16651). The difference is packaging: DLRG4 uses Tube packaging while DL also uses Tube packaging. The DL variant has active product status, making it preferable for new procurement.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL Level 1 rating, matching the original part's environmental and regulatory specifications.

Q: Why are some substitutes marked as obsolete?

A: The 74FCT162652ATPVCT and CY74FCT162543TPVCT are from the 74FCT series, which has been superseded by the 74ACT series. While electrically compatible, these obsolete parts should only be used when active alternatives are unavailable, as they may face future supply constraints.

Q: Does packaging format affect electrical performance?

A: No. Tape & Reel and Tube packaging formats contain identical die and electrical characteristics. The choice between formats depends on assembly process requirements and volume considerations.

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