74FCT162646ATPVCG4 Equivalent & Substitute Parts

Part Overview

The 74FCT162646ATPVCG4 is a non-inverting transceiver logic IC manufactured by Texas Instruments, featuring 2 elements with 8 bits per element and 3-state output capability. This device operates at 4.5V to 5.5V supply voltage with 24mA output current capacity and is housed in a 56-BSSOP surface mount package. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing system support and new designs.

Key Parameters

Parameter	Value
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 74FCT162646ATPVCG4 are selected based on strict electrical and mechanical parameter matching. All identified substitutes maintain identical specifications across the following critical parameters:

Logic type: Non-inverting transceiver configuration
Element and bit configuration: 2 elements × 8 bits per element
Output architecture: 3-state output
Current specifications: 24mA output high and low
Supply voltage range: 4.5V to 5.5V
Operating temperature range: -40°C to 85°C
Package form factor: 56-BSSOP surface mount
Environmental compliance: ROHS3 compliant, MSL 1

Substitutes are grouped into two categories: active and last-time-buy 74ACT series parts, and obsolete 74FCT series variants. All maintain full parametric equivalence with the primary part.

Parameter Comparison

Part Number	Manufacturer	Series	Logic Type	Elements × Bits	Output Type	Current (mA)	Supply Voltage	Temp Range	Package	Product Status	RoHS
74FCT162646ATPVCG4	Texas Instruments	74FCT	Non-Inverting	2 × 8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	56-BSSOP	Discontinued	ROHS3
74ACT16652DL	Texas Instruments	74ACT	Non-Inverting	2 × 8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	56-BSSOP	Last Time Buy	ROHS3
74ACT16543DL	Texas Instruments	74ACT	Non-Inverting	2 × 8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	56-BSSOP	Last Time Buy	ROHS3
74ACT16646DL	Texas Instruments	74ACT	Non-Inverting	2 × 8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	56-BSSOP	Last Time Buy	ROHS3
74ACT16651DL	Texas Instruments	74ACT	Non-Inverting	2 × 8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	56-BSSOP	Active	ROHS3
CY74FCT162543CTPVC	Texas Instruments	74FCT	Non-Inverting	2 × 8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	56-BSSOP	Obsolete	ROHS3
CY74FCT162543TPVC	Texas Instruments	74FCT	Non-Inverting	2 × 8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	56-BSSOP	Obsolete	ROHS3
CY74FCT162646ATPVC	Texas Instruments	74FCT	Non-Inverting	2 × 8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	56-BSSOP	Obsolete	ROHS3
CY74FCT162646CTPVC	Texas Instruments	74FCT	Non-Inverting	2 × 8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	56-BSSOP	Obsolete	ROHS3
CY74FCT162652ATPVC	Texas Instruments	74FCT	Non-Inverting	2 × 8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	56-BSSOP	Obsolete	ROHS3
CY74FCT162952BTPVC	Texas Instruments	74FCT	Non-Inverting	2 × 8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	56-BSSOP	Obsolete	ROHS3

Engineering Selection Recommendations

For new designs and ongoing production, 74ACT16651DL is the preferred substitute. This part maintains full parametric equivalence with the 74FCT162646ATPVCG4 and carries active product status from Texas Instruments, ensuring long-term availability and supply chain stability. All 74ACT series alternatives (74ACT16652DL, 74ACT16543DL, 74ACT16646DL) are designated as last-time-buy, indicating limited future availability.

The 74FCT series substitutes (CY74FCT162543CTPVC, CY74FCT162543TPVC, CY74FCT162646ATPVC, CY74FCT162646CTPVC, CY74FCT162652ATPVC, CY74FCT162952BTPVC) are classified as obsolete and should be used only for legacy system maintenance where existing inventory exists. All substitute parts maintain ROHS3 compliance and MSL 1 rating, meeting current environmental and moisture sensitivity requirements.

Frequently Asked Questions (FAQ)

Q: Can 74ACT16651DL be used as a direct replacement for 74FCT162646ATPVCG4?

A: Yes. Both parts share identical electrical specifications (2 elements, 8 bits per element, 3-state output, 24mA current, 4.5V–5.5V supply, -40°C to 85°C operating range) and the same 56-BSSOP package form factor. The primary difference is product status: 74ACT16651DL is active, while the original part is discontinued.

Q: What is the difference between 74ACT and 74FCT series parts?

A: Both series are non-inverting transceiver logic families manufactured by Texas Instruments with identical parametric specifications for this application. The 74ACT series represents current production, while 74FCT variants are obsolete. Electrical performance and pin compatibility are equivalent.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification and MSL 1 rating, meeting current environmental and moisture sensitivity standards.

Q: Can I mix 74ACT and 74FCT series parts in the same design?

A: Yes. All parts maintain identical electrical and mechanical specifications, allowing interchangeability within the same circuit board design. However, for new production, sourcing from the active 74ACT16651DL is recommended to avoid obsolescence issues.

Q: What inventory levels are available for substitute parts?

A: 74ACT16651DL has 1,048 units in stock. 74ACT16646DL has the highest inventory at 4,802 units. Obsolete 74FCT variants have limited inventory ranging from 821 to 1,247 units. Verify current availability with your supplier before committing to production schedules.

Q: Is the 56-BSSOP package identical across all substitute parts?

A: Yes. All substitute parts use the 56-BSSOP (0.295", 7.50mm width) surface mount package, ensuring mechanical compatibility with existing PCB layouts and assembly processes.

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