74ACT16646MTDX Equivalent & Substitute Parts

Part Overview

The 74ACT16646MTDX is a non-inverting transceiver IC manufactured by onsemi, featuring 2 elements with 8 bits per element and 3-state output capability. This component operates within the 4.5V to 5.5V supply voltage range and is housed in a 56-TSSOP package. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

74ACT16646MTDX

onsemiIn Stock: 71474ACT16646MTDX Datasheet

Current PartRFQ

74ACT16646DL

Texas InstrumentsIn Stock: 482074ACT16646DL Datasheet

SimilarRFQ

74ACT16646DLR

Texas InstrumentsIn Stock: 223874ACT16646DLR Datasheet

SimilarRFQ

SN74LVCH16646ADGGR

Texas InstrumentsIn Stock: 3249SN74LVCH16646ADGGR Datasheet

SimilarRFQ

74ACT16543DGGR

Texas InstrumentsIn Stock: 215274ACT16543DGGR Datasheet

Parametric EquivalentRFQ

74FCT162543ATPACT

Texas InstrumentsIn Stock: 108174FCT162543ATPACT Datasheet

Parametric EquivalentRFQ

74FCT162646CTPACT

Cypress Semiconductor CorpIn Stock: 703174FCT162646CTPACT Datasheet

Parametric EquivalentRFQ

74FCT162652CTPACT

Texas InstrumentsIn Stock: 98574FCT162652CTPACT Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74ACT16646MTDX is determined by 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-TFSOP (0.240", 6.10mm Width)

Substitute parts are grouped into two categories:

Direct Package Equivalents: Parts maintaining identical package specifications (56-TSSOP) with matching electrical parameters and supply voltage range.

Parametric Equivalents: Parts with identical functional specifications and electrical performance but potentially different package variants or series designations, suitable for applications where package footprint flexibility exists.

Parameter Comparison

Engineering Selection Recommendations

Recommended Primary Substitute: 74ACT16646DLR (Texas Instruments)

This part maintains identical electrical specifications and supply voltage range as the original 74ACT16646MTDX. The 74ACT16646DLR is currently in active production status, ensuring long-term availability. It carries ROHS3 compliance and is supplied in Tape & Reel packaging, suitable for automated assembly processes. The package variant (56-BSSOP vs. 56-TFSOP) represents a minor footprint difference that requires PCB layout verification but does not affect electrical compatibility.

Secondary Substitute: 74ACT16543DGGR (Texas Instruments)

This parametric equivalent maintains the same 56-TFSOP package footprint as the original part, eliminating PCB layout concerns. It operates within identical supply voltage and temperature ranges with matching output current specifications. Active product status ensures continued availability. The different base part number (74ACT16543 vs. 74ACT16646) reflects internal functional differences that do not affect substitution compatibility for this application.

Alternative for Lower Voltage Applications: SN74LVCH16646ADGGR (Texas Instruments)

This part is suitable only if your application can operate within the reduced supply voltage range of 1.65V to 3.6V. It maintains the same 56-TFSOP package and active product status. This option is not recommended as a direct replacement for 5V-dependent designs.

Avoid: 74FCT162543ATPACT and 74FCT162652CTPACT are obsolete parts and should not be selected for new designs despite matching electrical parameters.

Frequently Asked Questions (FAQ)

Q: Can I use 74ACT16646DL instead of 74ACT16646DLR?

A: Yes, both parts are electrically identical and maintain the same supply voltage range (4.5V ~ 5.5V), output current (24mA), and operating temperature (-40°C ~ 85°C). The primary difference is packaging format: 74ACT16646DL is supplied in Tube packaging, while 74ACT16646DLR is supplied in Tape & Reel. Select based on your assembly process requirements. Note that 74ACT16646DL has Last Time Buy status, making 74ACT16646DLR the preferred long-term choice.

Q: What is the difference between 74ACT16646MTDX and 74ACT16543DGGR?

A: Both parts are non-inverting transceivers with 2 elements, 8 bits per element, and 3-state output. They share identical electrical specifications: 24mA output current, 4.5V ~ 5.5V supply voltage, and -40°C ~ 85°C operating temperature. The base part numbers differ (16646 vs. 16543), indicating different internal logic configurations, but this does not prevent substitution. The 74ACT16543DGGR is currently active in production.

Q: Why does the SN74LVCH16646ADGGR have a different supply voltage range?

A: The SN74LVCH16646ADGGR operates at 1.65V ~ 3.6V, which is a lower voltage range than the original 74ACT16646MTDX (4.5V ~ 5.5V). This part is suitable only for applications designed for low-voltage operation. It cannot be used as a direct replacement in 5V systems without additional voltage regulation circuitry.

Q: Are there package compatibility concerns between 56-TFSOP and 56-BSSOP?

A: Yes. The 56-TFSOP package has a width of 0.240" (6.10mm), while the 56-BSSOP package has a width of 0.295" (7.50mm). Before selecting 74ACT16646DL or 74ACT16646DLR, verify that your PCB layout can accommodate the wider package footprint. Pin pitch and lead configuration remain compatible, but board space must be confirmed.

Q: Should I use 74FCT162646CTPACT as a substitute?

A: The 74FCT162646CTPACT is electrically compatible and maintains the same 56-TFSOP package. However, it is currently in active production status from Cypress Semiconductor Corp, making it a viable option. Verify component availability and lead times through your supplier before committing to this alternative.

Q: What does "3-State Output" mean for substitution purposes?

A: 3-State output means the transceiver can output high, low, or high-impedance (disabled) states. All listed substitute parts maintain this capability, ensuring functional compatibility in bus-based applications where multiple transceivers share signal lines.