74ACT16646SSCX Equivalent & Substitute Parts

Part Overview

The 74ACT16646SSCX is a non-inverting transceiver IC with 2 elements, 8 bits per element, and 3-state output capability. Manufactured by onsemi in a 56-SSOP package, this component operates across a 4.5V to 5.5V supply voltage range with output drive capability of 24mA for both high and low states. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	74ACT16646SSCX
Manufacturer	onsemi
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
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74ACT16646SSCX 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)
Package / Case: 56-BSSOP (0.295", 7.50mm Width)
Supplier Device Package: 56-SSOP

All substitute parts listed maintain identical electrical and mechanical specifications. Differences in product status, packaging format (tube vs. tape & reel), and manufacturer reflect availability and sourcing options rather than functional capability.

Parameter Comparison

Part Number	Manufacturer	Series	Logic Type	Elements	Bits/Element	Output Type	Current (mA)	Supply Voltage	Temp Range	Package	Product Status
74ACT16646SSCX	onsemi	74ACT	Non-Inverting	2	8	3-State	24/24	4.5-5.5V	-40 to 85°C	56-BSSOP	Obsolete
74ACT16646DL	Texas Instruments	74ACT	Non-Inverting	2	8	3-State	24/24	4.5-5.5V	-40 to 85°C	56-BSSOP	Last Time Buy
74ACT16543DLR	Texas Instruments	74ACT	Non-Inverting	2	8	3-State	24/24	4.5-5.5V	-40 to 85°C	56-BSSOP	Active
74ACT16646DLR	Texas Instruments	74ACT	Non-Inverting	2	8	3-State	24/24	4.5-5.5V	-40 to 85°C	56-BSSOP	Active
74ACT16652DLR	Texas Instruments	74ACT	Non-Inverting	2	8	3-State	24/24	4.5-5.5V	-40 to 85°C	56-BSSOP	Active
74ACT16657DLR	Texas Instruments	74ACT	Non-Inverting	2	8	3-State	24/24	4.5-5.5V	-40 to 85°C	56-BSSOP	Active
74FCT162652ATPVCT	Texas Instruments	74FCT	Non-Inverting	2	8	3-State	24/24	4.5-5.5V	-40 to 85°C	56-BSSOP	Obsolete
CY74FCT162543TPVCT	Texas Instruments	74FCT	Non-Inverting	2	8	3-State	24/24	4.5-5.5V	-40 to 85°C	56-BSSOP	Obsolete

Engineering Selection Recommendations

For new designs and production continuity, prioritize active product status parts. The 74ACT16646DLR, 74ACT16543DLR, 74ACT16652DLR, and 74ACT16657DLR from Texas Instruments are all active components with ROHS3 compliance and identical electrical specifications to the obsolete 74ACT16646SSCX.

The 74ACT16646DLR provides the closest functional match as a direct base product number equivalent. The 74ACT16543DLR, 74ACT16652DLR, and 74ACT16657DLR offer parametric equivalence with active product status, ensuring long-term availability and supply chain stability.

For applications where obsolete inventory remains available, the 74ACT16646DL (Last Time Buy status) from Texas Instruments serves as an intermediate option. The 74FCT162652ATPVCT and CY74FCT162543TPVCT are obsolete alternatives and should be considered only when active parts are unavailable.

All recommended substitutes maintain identical package geometry (56-BSSOP), electrical performance (24mA output drive, 4.5-5.5V supply), and operating temperature range (-40°C to 85°C), ensuring direct functional replacement without circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 74ACT16646SSCX with any of the listed parts?

A: Yes. All listed parts maintain identical electrical specifications: 2-element, 8-bit non-inverting transceiver with 3-state output, 24mA drive capability, 4.5-5.5V supply voltage, and -40°C to 85°C operating temperature. The 56-BSSOP package is consistent across all parts, enabling direct pin-compatible replacement.

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

A: Both series meet the same electrical and mechanical requirements for this application. The 74FCT series parts listed (74FCT162652ATPVCT and CY74FCT162543TPVCT) are obsolete. For new designs, 74ACT series active parts are preferred due to ongoing availability.

Q: Why are some parts listed as "Active" and others as "Obsolete" or "Last Time Buy"?

A: Product status reflects manufacturer support and availability. Active parts (74ACT16646DLR, 74ACT16543DLR, 74ACT16652DLR, 74ACT16657DLR) are currently manufactured and supported. Last Time Buy and Obsolete parts have limited or no future availability. For production designs, select active parts to ensure supply chain continuity.

Q: Does packaging format (tube vs. tape & reel) affect electrical performance?

A: No. Packaging format affects only handling, storage, and automated assembly compatibility. The 74ACT16646DL (tube packaging) and 74ACT16646DLR (tape & reel packaging) are electrically identical. Select based on your assembly process requirements.

Q: Are all substitute parts ROHS3 compliant?

A: The active substitute parts (74ACT16646DLR, 74ACT16543DLR, 74ACT16652DLR, 74ACT16657DLR) and the Last Time Buy part (74ACT16646DL) are ROHS3 compliant. The obsolete 74FCT series parts are also ROHS3 compliant. All parts carry REACH Unaffected status.

Q: What is the Moisture Sensitivity Level (MSL) for these parts?

A: All parts carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

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