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74ABT646CSC Equivalent & Substitute Parts
Part Overview
The 74ABT646CSC is a non-inverting transceiver logic IC manufactured by onsemi, featuring 1 element with 8 bits per element and 3-state output capability. This component operates within a 4.5V to 5.5V supply voltage range and is housed in a 24-SOP package. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 74ABT646CSC |
| Manufacturer | onsemi |
| Series | 74ABT |
| Logic Type | Transceiver, Non-Inverting |
| Number of Elements | 1 |
| Number of Bits per Element | 8 |
| Output Type | 3-State |
| Current - Output High, Low | 32mA, 64mA |
| 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 |
| Product Status | Obsolete |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitute parts for the 74ABT646CSC are classified based on strict electrical and mechanical parameter alignment. The primary substitution criteria are:
Core Electrical Parameters (Must Match):
- Logic Type: Transceiver, Non-Inverting
- Number of Elements: 1
- Number of Bits per Element: 8
- Output Type: 3-State
- Current - Output High, Low: 32mA, 64mA
- Voltage - Supply: 4.5V ~ 5.5V
- Operating Temperature: -40°C ~ 85°C (TA)
- Series: 74ABT
Mechanical Parameters (Must Match or Be Compatible):
- Mounting Type: Surface Mount
- Package / Case: 24-SOIC (0.295", 7.50mm Width)
All substitute parts listed maintain identical electrical specifications and compatible package dimensions. Packaging format variations (Tape & Reel vs. Tube) do not affect electrical compatibility but may influence procurement and handling procedures.
Parameter Comparison
| Part Number | Manufacturer | Logic Type | Elements / Bits | Output Type | Current (High/Low) | Supply Voltage | Temp Range | Package | Product Status | Packaging Format |
|---|---|---|---|---|---|---|---|---|---|---|
| 74ABT646CSC | onsemi | Transceiver, Non-Inverting | 1 / 8 | 3-State | 32mA, 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-SOIC (0.295") | Obsolete | - |
| SN74ABT646ADWR | Texas Instruments | Transceiver, Non-Inverting | 1 / 8 | 3-State | 32mA, 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-SOIC (0.295") | Active | Tape & Reel |
| SN74ABT646ANSR | Texas Instruments | Transceiver, Non-Inverting | 1 / 8 | 3-State | 32mA, 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-SOIC (0.209") | Active | Tape & Reel |
| SN74ABT646DWR | Texas Instruments | Transceiver, Non-Inverting | 1 / 8 | 3-State | 32mA, 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-SOIC (0.295") | Active | Tape & Reel |
| SN74ABT543ADW | Texas Instruments | Transceiver, Non-Inverting | 1 / 8 | 3-State | 32mA, 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-SOIC (0.295") | Active | Tube |
| SN74ABT646ADW | Texas Instruments | Transceiver, Non-Inverting | 1 / 8 | 3-State | 32mA, 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-SOIC (0.295") | Active | Tube |
| SN74ABT646DW | Texas Instruments | Transceiver, Non-Inverting | 1 / 8 | 3-State | 32mA, 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-SOIC (0.295") | Active | Tube |
| SN74ABT652ADW | Texas Instruments | Transceiver, Non-Inverting | 1 / 8 | 3-State | 32mA, 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-SOIC (0.295") | Active | Tube |
| SN74ABT657ADW | Texas Instruments | Transceiver, Non-Inverting | 1 / 8 | 3-State | 32mA, 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-SOIC (0.295") | Active | Tube |
Engineering Selection Recommendations
All listed substitute parts are manufactured by Texas Instruments and maintain active product status, ensuring long-term availability and supply chain stability. The primary advantage of these substitutes over the obsolete 74ABT646CSC is their active lifecycle status and ROHS3 compliance certification.
For direct pin-compatible replacement with identical package dimensions (0.295" width), select from SN74ABT646ADWR, SN74ABT646DWR, SN74ABT646ADW, or SN74ABT646DW. These parts share the base product number 74ABT646 and are electrically and mechanically equivalent to the original component.
SN74ABT646ANSR offers electrical equivalence but features a narrower package width (0.209" vs. 0.295"), requiring PCB layout verification before implementation.
Parametric equivalents SN74ABT543ADW, SN74ABT652ADW, and SN74ABT657ADW maintain all critical electrical parameters but use different base product numbers (74ABT543, 74ABT652, 74ABT657 respectively). These parts are suitable for applications where the specific transceiver variant is interchangeable within the system design.
Packaging format selection (Tape & Reel vs. Tube) depends on procurement volume and assembly process requirements and does not affect electrical performance.
Frequently Asked Questions (FAQ)
Q: Can SN74ABT646ANSR be used as a direct replacement for 74ABT646CSC?
A: SN74ABT646ANSR is electrically equivalent but has a different package width (0.209" vs. 0.295"). PCB footprint compatibility must be verified before substitution. Pin count and electrical specifications are identical.
Q: What is the difference between Tape & Reel and Tube packaging?
A: Both packaging formats contain identical components with the same electrical specifications. Tape & Reel packaging is optimized for high-volume automated assembly, while Tube packaging is suitable for lower volumes and manual handling. The choice depends on production requirements, not electrical performance.
Q: Are all substitute parts ROHS3 compliant?
A: All Texas Instruments substitute parts listed are ROHS3 compliant. The original 74ABT646CSC from onsemi does not specify ROHS status in the provided data.
Q: Can parametric equivalents like SN74ABT543ADW replace the 74ABT646CSC?
A: SN74ABT543ADW maintains identical electrical parameters (voltage, current, temperature range, output type, and bit configuration). However, it uses a different base product number (74ABT543 vs. 74ABT646), indicating a different transceiver variant. Substitution is valid only if the specific transceiver function is interchangeable within your circuit design.
Q: What inventory levels are available for these substitute parts?
A: Current inventory for active substitutes ranges from 899 to 2788 pieces. SN74ABT646ADWR has the highest availability at 2788 pieces. Inventory levels should be confirmed with suppliers for procurement planning.
Q: Is the operating temperature range identical across all parts?
A: All parts operate within -40°C to 85°C (TA), matching the original 74ABT646CSC specification.
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