74ACTQ16646MTDX Equivalent & Substitute Parts

Part Overview

The 74ACTQ16646MTDX is a non-inverting transceiver IC manufactured by onsemi, featuring 2 elements with 8 bits per element and 3-state output capability. This 56-TSSOP surface mount device operates across a 4.5V to 5.5V supply range and is rated for -40°C to 85°C operating temperatures. The part is currently classified as obsolete, making equivalent and substitute parts essential for ongoing design support and production continuity.

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-TFSOP (0.240", 6.10mm Width)
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74ACTQ16646MTDX 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)
Mounting Type: Surface Mount

Substitute parts are grouped into two categories based on package compatibility:

Direct Package Match (56-TSSOP): Parts maintaining identical package specifications to the original 74ACTQ16646MTDX.

Compatible Package Variant (56-SSOP): Parts with equivalent electrical performance but different package footprint (56-BSSOP, 0.295" width vs. 0.240" width), requiring PCB layout verification.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Bits/Element	Output Type	Current (mA)	Supply Voltage	Temp Range	Package	Product Status
74ACTQ16646MTDX	onsemi	Transceiver, Non-Inverting	2	8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	56-TFSOP	Obsolete
74ACT16646DL	Texas Instruments	Transceiver, Non-Inverting	2	8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	56-BSSOP	Last Time Buy
74ACT16646DLR	Texas Instruments	Transceiver, Non-Inverting	2	8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	56-BSSOP	Active
74ACT16543DGGR	Texas Instruments	Transceiver, Non-Inverting	2	8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	56-TFSOP	Active
74FCT162543ATPACT	Texas Instruments	Transceiver, Non-Inverting	2	8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	56-TFSOP	Obsolete
74FCT162646CTPACT	Cypress Semiconductor Corp	Transceiver, Non-Inverting	2	8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	56-TFSOP	Active
74FCT162652CTPACT	Texas Instruments	Transceiver, Non-Inverting	2	8	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	56-TFSOP	Obsolete

Engineering Selection Recommendations

For New Designs: 74ACT16646DLR (Texas Instruments) is the preferred substitute. This part maintains active product status, offers ROHS3 compliance, and is available in tape & reel packaging for production volumes. The 56-BSSOP package requires PCB layout adjustment but provides long-term availability assurance.

For Direct Package Compatibility: 74ACT16543DGGR (Texas Instruments) provides identical 56-TFSOP packaging to the original 74ACTQ16646MTDX. This part is active and ROHS3 compliant, enabling drop-in replacement without PCB modification.

For Immediate Availability: 74FCT162646CTPACT (Cypress Semiconductor Corp) offers the highest current inventory (6939 pcs) with active product status and identical 56-TFSOP packaging. This part is suitable for urgent production requirements.

For Legacy Support: 74ACT16646DL (Texas Instruments) remains available under Last Time Buy status with substantial inventory (4802 pcs). This option is appropriate for sustaining production of existing designs with minimal redesign effort.

Frequently Asked Questions (FAQ)

Q: Can 74ACT16646DL be used as a direct replacement for 74ACTQ16646MTDX?

A: Electrically yes, but with a package caveat. The 74ACT16646DL uses 56-BSSOP packaging (0.295" width) versus the original 56-TFSOP (0.240" width). PCB footprint verification is required before implementation.

Q: What is the difference between 74ACT16646DL and 74ACT16646DLR?

A: Both parts are electrically identical. The primary difference is packaging format: 74ACT16646DL is supplied in tube packaging, while 74ACT16646DLR is supplied in tape & reel format. The DLR variant is recommended for production environments.

Q: Why are some substitute parts marked as obsolete?

A: Parts such as 74FCT162543ATPACT and 74FCT162652CTPACT are classified as obsolete but remain available from inventory. These parts maintain full electrical and functional equivalence and are suitable for applications where existing stock is available.

Q: Is 74ACT16543DGGR functionally equivalent to 74ACTQ16646MTDX?

A: Yes. Both parts meet all critical electrical parameters: 2 elements, 8 bits per element, 3-state output, 24mA output current, 4.5V to 5.5V supply, and -40°C to 85°C operating range. The 74ACT16543DGGR maintains identical 56-TFSOP packaging.

Q: What compliance certifications apply to substitute parts?

A: All listed substitute parts carry REACH Unaffected status and EAR99 export classification. Texas Instruments and Cypress Semiconductor parts are ROHS3 compliant. Moisture sensitivity level is 1 (Unlimited) across all substitutes.

Q: Can I use 74FCT162646CTPACT in a design originally specified for 74ACTQ16646MTDX?

A: Yes. This part maintains identical electrical specifications and 56-TFSOP packaging. The primary consideration is product status: 74FCT162646CTPACT is active, ensuring long-term availability for production and support.

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