74F646SC Equivalent & Substitute Parts

Part Overview

The 74F646SC is a non-inverting transceiver logic integrated circuit manufactured by onsemi, designed for 8-bit bidirectional data transfer with 3-state output capability. This component operates within a 4.5V to 5.5V supply voltage range and is housed in a 24-SOP surface mount package. The 74F646SC is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing system maintenance and new design implementations.

Substiute Parts

74F646SC

onsemiIn Stock: 92874F646SC Datasheet

Current PartRFQ

SN74BCT543DW

Texas InstrumentsIn Stock: 1010SN74BCT543DW Datasheet

Parametric EquivalentRFQ

SN74BCT646DW

Texas InstrumentsIn Stock: 2341SN74BCT646DW Datasheet

Parametric EquivalentRFQ

SN74BCT652DW

Texas InstrumentsIn Stock: 848SN74BCT652DW Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74F646SC are identified based on strict parametric equivalence across the following critical criteria:

Functional Parameters:

• Logic Type: Transceiver, Non-Inverting
• Number of Elements: 1
• Number of Bits per Element: 8
• Output Type: 3-State

Electrical Parameters:

• Current - Output High, Low: 15mA, 64mA
• Voltage - Supply: 4.5V ~ 5.5V
• Operating Temperature: 0°C ~ 70°C (TA)

Physical Parameters:

• Package / Case: 24-SOIC (0.295", 7.50mm Width)
• Mounting Type: Surface Mount

All identified substitute parts match these parameters exactly, ensuring direct functional replacement capability.

Parameter Comparison

Engineering Selection Recommendations

SN74BCT543DW (Texas Instruments) - Active product status with ROHS3 compliance. Recommended for new designs and long-term availability requirements.

SN74BCT646DW (Texas Instruments) - Obsolete product status. Suitable for legacy system maintenance where existing inventory is available, but not recommended for new production.

SN74BCT652DW (Texas Instruments) - Active product status with ROHS3 compliance. Recommended for new designs and long-term availability requirements.

All three substitute parts provide identical electrical and mechanical compatibility with the 74F646SC. Selection between active-status alternatives should be based on supply chain availability and specific application requirements.

Frequently Asked Questions (FAQ)

Q: Can SN74BCT543DW, SN74BCT646DW, and SN74BCT652DW be used interchangeably with 74F646SC?

A: Yes. All three parts match the critical substitution parameters: 1-element, 8-bit non-inverting transceiver with 3-state output, identical electrical specifications (15mA/64mA output current, 4.5V-5.5V supply), and identical 24-SOIC package dimensions.

Q: What is the difference between the Texas Instruments substitute options?

A: SN74BCT543DW and SN74BCT652DW are active products with current manufacturing support and ROHS3 compliance. SN74BCT646DW is obsolete. All three are electrically and mechanically equivalent to the 74F646SC.

Q: Are there package compatibility concerns when substituting?

A: No. All parts use the 24-SOIC (0.295", 7.50mm Width) surface mount package with identical pinout and footprint requirements.

Q: Does the obsolete status of 74F646SC affect substitution validity?

A: The obsolete status of the original part makes substitute identification necessary for system continuity. The substitute parts provide full functional equivalence regardless of the original part's lifecycle status.

Q: Are there compliance differences between the main part and substitutes?

A: The Texas Instruments substitutes carry ROHS3 compliance certification. The 74F646SC compliance status is not specified in the provided data. All parts share identical REACH and ECCN classifications.