74ACT11245DW Equivalent & Substitute Parts

Part Overview

The 74ACT11245DW is a non-inverting transceiver logic integrated circuit manufactured by Texas Instruments, housed in a 24-SOIC surface mount package. This component functions as a single-element, 8-bit transceiver with 3-state output capability, designed for signal buffering and bus interface applications in digital systems operating at 4.5V to 5.5V supply voltage.

The 74ACT11245DW carries a Last Time Buy product status, indicating that Texas Instruments has discontinued active production. This status necessitates identification of equivalent substitute parts to ensure design continuity and procurement availability for new production runs or system maintenance.

Substiute Parts

74ACT11245DW

Texas InstrumentsIn Stock: 75274ACT11245DW Datasheet

Current PartRFQ

74ACT11245DWR

Texas InstrumentsIn Stock: 89774ACT11245DWR Datasheet

MFR RecommendedRFQ

MC74ACT646DWG

onsemiIn Stock: 972MC74ACT646DWG Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74ACT11245DW are identified based on strict electrical and mechanical parameter matching within the 74ACT logic family. The substitution criteria are:

Primary Substitution Criteria:

• Logic Type: Transceiver, Non-Inverting
• Number of Elements: 1
• 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: 24-SOIC (0.295", 7.50mm Width)
• Mounting Type: Surface Mount

Packaging Consideration: The 74ACT11245DWR differs from the main part only in packaging format (Tape & Reel versus standard packaging), maintaining identical electrical specifications and footprint compatibility.

Cross-Manufacturer Equivalents: The MC74ACT646DWG from onsemi provides parametric equivalence across all critical electrical and mechanical parameters, though it carries an Obsolete product status and differs in Moisture Sensitivity Level (MSL 3 versus MSL 1).

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: 74ACT11245DWR

The 74ACT11245DWR from Texas Instruments is the preferred substitute for the 74ACT11245DW. This part maintains Active product status, ensuring long-term availability and supply chain stability. All electrical parameters, thermal specifications, and package dimensions are identical. The only difference is packaging format (Tape & Reel), which does not affect circuit performance or PCB assembly compatibility. Both parts are ROHS3 compliant with MSL 1 rating.

Secondary Option: MC74ACT646DWG

The MC74ACT646DWG from onsemi provides parametric equivalence across all critical electrical and mechanical specifications. However, this part carries Obsolete product status, limiting its suitability for new designs or long-term production. Additionally, the MSL 3 rating (168 hours) requires stricter moisture control during storage and handling compared to the MSL 1 rating of the primary options. This part is suitable only for replacement applications where immediate availability is critical and supply chain risk is acceptable.

Frequently Asked Questions (FAQ)

Q: Can the 74ACT11245DWR be used as a direct replacement for the 74ACT11245DW?

A: Yes. The 74ACT11245DWR is a direct electrical and mechanical substitute. Both parts share identical logic specifications, output drive capability, supply voltage range, operating temperature range, and 24-SOIC package footprint. The difference in packaging format (Tape & Reel) does not affect circuit functionality or PCB assembly.

Q: Why is the 74ACT11245DW marked as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has discontinued active production of this part number. Existing inventory may be available through authorized distributors, but long-term availability cannot be guaranteed. The 74ACT11245DWR (Active status) is the recommended path forward for new designs.

Q: Is the MC74ACT646DWG suitable for production use?

A: The MC74ACT646DWG meets all electrical and mechanical requirements for functional equivalence. However, its Obsolete product status means supply availability is limited and unpredictable. The higher Moisture Sensitivity Level (MSL 3) also requires enhanced storage and handling protocols. This part should be considered only for replacement or repair applications where the primary substitute is unavailable.

Q: What is the significance of the MSL rating difference between the parts?

A: Moisture Sensitivity Level (MSL) defines the maximum time a component can be exposed to ambient moisture before soldering. MSL 1 (Unlimited) allows indefinite storage without moisture control. MSL 3 (168 hours) requires that the component be soldered within 168 hours of exposure to standard humidity conditions. For production environments with standard moisture control, this difference is manageable but requires documented handling procedures for the MC74ACT646DWG.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. The 74ACT11245DW, 74ACT11245DWR, and MC74ACT646DWG are all ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements for commercial and industrial applications.

Q: Can these parts be used interchangeably on the same PCB assembly?

A: Yes. All three parts share identical 24-SOIC package dimensions and pin configurations. PCB layout and assembly processes require no modification when substituting between these parts. Tape & Reel packaging (74ACT11245DWR) is compatible with standard pick-and-place assembly equipment.