74ACT16651DLR Equivalent & Substitute Parts

Part Overview

The 74ACT16651DLR is a non-inverting transceiver logic IC manufactured by Texas Instruments, featuring 2 elements with 8 bits per element and 3-state output capability in a 56-SSOP surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The device operates within the 4.5V to 5.5V supply voltage range and maintains consistent output drive capability across its operating temperature range of -40°C to 85°C.

Key Parameters

Parameter	Specification
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)
Mounting Type	Surface Mount
Package / Case	56-BSSOP (0.295", 7.50mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 74ACT16651DLR are qualified based on strict electrical and mechanical parameter matching. All substitute candidates maintain identical specifications 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 (0.295", 7.50mm Width)
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitutes are categorized into two groups: parametric equivalents with active product status (preferred for new designs) and direct packaging variants of the base product number.

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Packaging	Logic Type	Elements / Bits	Output Type	Current (mA)	Voltage (V)	Temp Range (°C)	Package	RoHS	Inventory (Pcs)
74ACT16651DLR	Texas Instruments	74ACT	Obsolete	Tape & Reel	Transceiver, Non-Inverting	2 / 8	3-State	24, 24	4.5 ~ 5.5	-40 ~ 85	56-BSSOP	ROHS3	641
74ACT16543DLR	Texas Instruments	74ACT	Active	Tape & Reel	Transceiver, Non-Inverting	2 / 8	3-State	24, 24	4.5 ~ 5.5	-40 ~ 85	56-BSSOP	ROHS3	1871
74ACT16646DLR	Texas Instruments	74ACT	Active	Tape & Reel	Transceiver, Non-Inverting	2 / 8	3-State	24, 24	4.5 ~ 5.5	-40 ~ 85	56-BSSOP	ROHS3	2200
74ACT16652DLR	Texas Instruments	74ACT	Active	Tape & Reel	Transceiver, Non-Inverting	2 / 8	3-State	24, 24	4.5 ~ 5.5	-40 ~ 85	56-BSSOP	ROHS3	931
74ACT16657DLR	Texas Instruments	74ACT	Active	Tape & Reel	Transceiver, Non-Inverting	2 / 8	3-State	24, 24	4.5 ~ 5.5	-40 ~ 85	56-BSSOP	ROHS3	768
74FCT162652ATPVCT	Texas Instruments	74FCT	Obsolete	Tape & Reel	Transceiver, Non-Inverting	2 / 8	3-State	24, 24	4.5 ~ 5.5	-40 ~ 85	56-BSSOP	ROHS3	830
CY74FCT162543TPVCT	Texas Instruments	74FCT	Obsolete	Tape & Reel	Transceiver, Non-Inverting	2 / 8	3-State	24, 24	4.5 ~ 5.5	-40 ~ 85	56-BSSOP	ROHS3	1018
74ACT16651DL	Texas Instruments	74ACT	Active	Tube	Transceiver, Non-Inverting	2 / 8	3-State	24, 24	4.5 ~ 5.5	-40 ~ 85	56-BSSOP	ROHS3	1048

Engineering Selection Recommendations

For new designs, prioritize active product status parts from the 74ACT series: 74ACT16543DLR, 74ACT16646DLR, 74ACT16652DLR, and 74ACT16657DLR. These parts maintain full electrical and mechanical compatibility with the 74ACT16651DLR while offering ongoing manufacturer support and supply continuity.

The 74ACT16651DL variant provides an active alternative using identical electrical specifications but supplied in tube packaging rather than tape and reel format. This option is suitable for applications where packaging format does not impose supply chain constraints.

Obsolete series parts (74FCT162652ATPVCT and CY74FCT162543TPVCT) meet all electrical and mechanical requirements but lack active product status. These parts are acceptable only for legacy system maintenance or where existing inventory is available and supply continuity is not a concern.

All substitute parts maintain ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can 74ACT16543DLR be used as a direct replacement for 74ACT16651DLR?

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, -40°C to 85°C operating range) and the same 56-BSSOP package. The primary difference is product status: 74ACT16543DLR is active while 74ACT16651DLR is obsolete.

Q: What is the difference between 74ACT16651DLR and 74ACT16651DL?

A: Both parts are from the same base product number (74ACT16651) with identical electrical and mechanical specifications. The difference is packaging format: DLR indicates tape and reel supply, while DL indicates tube supply. The 74ACT16651DL is active and available for new orders.

Q: Are 74FCT series parts suitable replacements?

A: 74FCT162652ATPVCT and CY74FCT162543TPVCT meet all electrical and mechanical parameters but are classified as obsolete. They are functionally equivalent but not recommended for new designs due to lack of active product status and potential supply discontinuation.

Q: Does packaging format affect electrical compatibility?

A: No. Tape and reel (DLR) and tube (DL) packaging formats contain identical die and electrical performance. The packaging difference affects only supply chain logistics and handling procedures, not circuit functionality.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL Level 1 rating, meeting standard environmental and manufacturing requirements.

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