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SN74LVC646APWR Equivalent & Substitute Parts
Part Overview
The SN74LVC646APWR is a non-inverting transceiver logic integrated circuit manufactured by Texas Instruments. This 24-TSSOP surface mount device functions as a single-element, 8-bit transceiver with 3-state output capability, operating across a supply voltage range of 1.65V to 3.6V. The device is classified as Active product status and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).
Substitute parts are necessary when the primary part number becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when inventory constraints necessitate functionally equivalent alternatives from the same product family.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| 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 | 1.65V ~ 3.6V |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Package / Case | 24-TSSOP (0.173", 4.40mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the SN74LVC646APWR is determined by strict equivalence across the following critical parameters:
- 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: 1.65V ~ 3.6V
- Operating Temperature: -40°C ~ 85°C (TA)
- Package / Case: 24-TSSOP (0.173", 4.40mm Width)
- Mounting Type: Surface Mount
- RoHS Status: ROHS3 Compliant
- Moisture Sensitivity Level (MSL): 1 (Unlimited)
All substitute parts listed maintain identical electrical specifications and mechanical compatibility. Variations in product status (Active vs. Discontinued at DiGi Electronics) and packaging designation (Tape & Reel vs. unspecified) do not affect functional equivalence.
Parameter Comparison
| Part Number | Manufacturer | Series | Logic Type | Elements | Bits/Element | Output Type | Current (mA) | Supply Voltage | Temp Range | Package | Product Status | Inventory |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SN74LVC646APWR | Texas Instruments | 74LVC | Transceiver, Non-Inverting | 1 | 8 | 3-State | 24, 24 | 1.65V ~ 3.6V | -40°C ~ 85°C | 24-TSSOP | Active | 773 Pcs |
| SN74LVC646APWT | Texas Instruments | 74LVC | Transceiver, Non-Inverting | 1 | 8 | 3-State | 24, 24 | 1.65V ~ 3.6V | -40°C ~ 85°C | 24-TSSOP | Discontinued at DiGi Electronics | 883 Pcs |
| SN74LVC652APWR | Texas Instruments | 74LVC | Transceiver, Non-Inverting | 1 | 8 | 3-State | 24, 24 | 1.65V ~ 3.6V | -40°C ~ 85°C | 24-TSSOP | Active | 3400 Pcs |
| SN74LVC652APWT | Texas Instruments | 74LVC | Transceiver, Non-Inverting | 1 | 8 | 3-State | 24, 24 | 1.65V ~ 3.6V | -40°C ~ 85°C | 24-TSSOP | Active | 1776 Pcs |
| SN74LVC543APWR | Texas Instruments | 74LVC | Transceiver, Non-Inverting | 1 | 8 | 3-State | 24, 24 | 1.65V ~ 3.6V | -40°C ~ 85°C | 24-TSSOP | Active | 4080 Pcs |
| SN74LVC543APWT | Texas Instruments | 74LVC | Transceiver, Non-Inverting | 1 | 8 | 3-State | 24, 24 | 1.65V ~ 3.6V | -40°C ~ 85°C | 24-TSSOP | Active | 1459 Pcs |
| SN74LVC2952APWR | Texas Instruments | 74LVC | Transceiver, Non-Inverting | 1 | 8 | 3-State | 24, 24 | 1.65V ~ 3.6V | -40°C ~ 85°C | 24-TSSOP | Active | 699 Pcs |
| SN74LVC2952APWT | Texas Instruments | 74LVC | Transceiver, Non-Inverting | 1 | 8 | 3-State | 24, 24 | 1.65V ~ 3.6V | -40°C ~ 85°C | 24-TSSOP | Discontinued at DiGi Electronics | 786 Pcs |
Engineering Selection Recommendations
All listed substitute parts maintain full electrical and mechanical compatibility with the SN74LVC646APWR. Selection among equivalents should be based on the following criteria:
Product Status Consideration: SN74LVC543APWR and SN74LVC652APWR are designated as Active products, ensuring continued manufacturer support and long-term availability. Parts marked as Discontinued at DiGi Electronics (SN74LVC646APWT and SN74LVC2952APWT) may face future supply constraints.
Inventory Availability: SN74LVC543APWR offers the highest inventory level at 4080 pieces, followed by SN74LVC652APWR at 3400 pieces. These options provide superior supply security for high-volume applications.
Compliance Status: All substitute parts maintain identical RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity ratings, ensuring regulatory and manufacturing process compatibility.
Packaging Designation: Parts designated with "APWR" suffix indicate Tape & Reel packaging, standard for automated assembly processes. Parts with "APWT" suffix or unspecified packaging may require process validation for specific manufacturing environments.
Frequently Asked Questions (FAQ)
Q: Can SN74LVC543APWR be used as a direct replacement for SN74LVC646APWR?
A: Yes. Both devices are parametrically equivalent across all critical electrical and mechanical specifications: identical logic type (Transceiver, Non-Inverting), 1 element with 8 bits per element, 3-state output, 24mA output current, 1.65V to 3.6V supply voltage range, -40°C to 85°C operating temperature, and 24-TSSOP package. The base product numbers differ (543 vs. 646), but functional equivalence is complete.
Q: What is the difference between APWR and APWT packaging designations?
A: APWR indicates Tape & Reel (TR) packaging, the standard format for automated surface mount assembly. APWT designation or unspecified packaging may represent alternative tape configurations or bulk packaging. For automated manufacturing processes, APWR variants are recommended to ensure compatibility with standard pick-and-place equipment.
Q: Are discontinued parts suitable for new designs?
A: Parts marked as Discontinued at DiGi Electronics (SN74LVC646APWT and SN74LVC2952APWT) should not be selected for new product designs requiring long-term production support. These parts are appropriate only for maintenance, repair, or limited-quantity applications where existing inventory is available.
Q: Do all substitute parts meet the same compliance requirements?
A: Yes. All listed substitute parts are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, matching the compliance profile of the SN74LVC646APWR. REACH status is Unaffected for all parts, and ECCN classification is EAR99 across the entire family.
Q: Which substitute part offers the best supply security?
A: SN74LVC543APWR provides the highest inventory availability at 4080 pieces and maintains Active product status, making it the optimal choice for applications requiring supply continuity and long-term availability assurance.
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