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74ABT16646CSSCX Equivalent & Substitute Parts
Part Overview
The 74ABT16646CSSCX is a non-inverting transceiver logic IC manufactured by onsemi, featuring 2 elements with 8 bits per element and 3-state output capability. This device operates within the 4.5V to 5.5V supply voltage range and is housed in a 56-SSOP package. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 74ABT16646CSSCX |
| Manufacturer | onsemi |
| Series | 74ABT |
| Logic Type | Transceiver, Non-Inverting |
| Number of Elements | 2 |
| Number of Bits per Element | 8 |
| Output Type | 3-State |
| Current - Output High | 32mA |
| Current - Output Low | 64mA |
| Voltage - Supply | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Package / Case | 56-BSSOP (0.295", 7.50mm Width) |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the 74ABT16646CSSCX is determined by strict equivalence across 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: 32mA, 64mA
- Voltage - Supply: 4.5V ~ 5.5V
- Operating Temperature: -40°C ~ 85°C (TA)
- Package / Case: 56-BSSOP (0.295", 7.50mm Width)
- Mounting Type: Surface Mount
Substitute parts are grouped into two categories: direct pin-compatible substitutes and parametric equivalents. Direct substitutes maintain identical package specifications and base product functionality. Parametric equivalents share all electrical and thermal characteristics but may originate from different product lines (74FCT, 74LVC series) while maintaining functional compatibility within the specified parameter envelope.
Parameter Comparison
| Part Number | Manufacturer | Series | Logic Type | Elements / Bits | Output Type | I_out (H/L) | V_supply | Temp Range | Package | Product Status | RoHS |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 74ABT16646CSSCX | onsemi | 74ABT | Non-Inverting | 2 / 8 | 3-State | 32mA / 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | 56-BSSOP | Obsolete | REACH Unaffected |
| SN74ABT16646DGGR | Texas Instruments | 74ABT | Non-Inverting | 2 / 8 | 3-State | 32mA / 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | 56-TFSOP | Active | ROHS3 Compliant |
| SN74ABT16646DL | Texas Instruments | 74ABT | Non-Inverting | 2 / 8 | 3-State | 32mA / 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | 56-BSSOP | Active | ROHS3 Compliant |
| SN74ABT16646DLR | Texas Instruments | 74ABT | Non-Inverting | 2 / 8 | 3-State | 32mA / 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | 56-BSSOP | Active | ROHS3 Compliant |
| CY74FCT16646CTPVCT | Texas Instruments | 74FCT | Non-Inverting | 2 / 8 | 3-State | 32mA / 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | 56-BSSOP | Obsolete | ROHS3 Compliant |
| CY74FCT16543CTPVCT | Texas Instruments | 74FCT | Non-Inverting | 2 / 8 | 3-State | 32mA / 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | 56-BSSOP | Obsolete | ROHS3 Compliant |
| CY74FCT16652ATPVCT | Texas Instruments | 74FCT | Non-Inverting | 2 / 8 | 3-State | 32mA / 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | 56-BSSOP | Obsolete | ROHS3 Compliant |
| SN74ABT16543DLR | Texas Instruments | 74ABT | Non-Inverting | 2 / 8 | 3-State | 32mA / 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | 56-BSSOP | Active | ROHS3 Compliant |
| SN74ABT16652DLR | Texas Instruments | 74ABT | Non-Inverting | 2 / 8 | 3-State | 32mA / 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | 56-BSSOP | Active | ROHS3 Compliant |
| SN74ABT16657DLR | Texas Instruments | 74ABT | Non-Inverting | 2 / 8 | 3-State | 32mA / 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | 56-BSSOP | Active | ROHS3 Compliant |
| SN74ABT16470DLR | Texas Instruments | 74ABT | Non-Inverting | 2 / 8 | 3-State | 32mA / 64mA | 4.5V ~ 5.5V | -40°C ~ 85°C | 56-BSSOP | Discontinued at DiGi Electronics | ROHS3 Compliant |
Engineering Selection Recommendations
For new designs and ongoing procurement, SN74ABT16646DL and SN74ABT16646DLR are the primary recommended substitutes. Both are manufactured by Texas Instruments, maintain active product status, and are ROHS3 compliant. SN74ABT16646DL is supplied in tube packaging, while SN74ABT16646DLR is supplied in cut tape format. Both share identical electrical specifications and the same 56-BSSOP package footprint as the original 74ABT16646CSSCX.
SN74ABT16646DGGR offers an alternative with active status and ROHS3 compliance but uses a 56-TFSOP package variant (0.240", 6.10mm width) instead of the standard 56-BSSOP. This package difference requires PCB layout verification before selection.
For applications where base product number flexibility is acceptable, SN74ABT16543DLR, SN74ABT16652DLR, and SN74ABT16657DLR are parametric equivalents with active product status and full ROHS3 compliance. All maintain identical electrical and thermal operating parameters within the specified envelope.
Parametric equivalents from the 74FCT series (CY74FCT16646CTPVCT, CY74FCT16543CTPVCT, CY74FCT16652ATPVCT) are obsolete and should be avoided for new designs despite ROHS3 compliance.
Frequently Asked Questions (FAQ)
Q: Can SN74ABT16646DGGR be used as a direct replacement for 74ABT16646CSSCX?
A: SN74ABT16646DGGR is electrically equivalent but uses a 56-TFSOP package (0.240" width) instead of the 56-BSSOP package (0.295" width) of the original part. PCB footprint compatibility must be verified before substitution.
Q: What is the difference between SN74ABT16646DL and SN74ABT16646DLR?
A: Both parts are identical in electrical specifications and package type (56-BSSOP). The difference is packaging format: SN74ABT16646DL is supplied in tube packaging, while SN74ABT16646DLR is supplied in cut tape format. Selection depends on assembly process requirements.
Q: Are the parametric equivalents (SN74ABT16543DLR, SN74ABT16652DLR, SN74ABT16657DLR) suitable for direct substitution?
A: Yes. These parts are parametric equivalents with identical electrical characteristics, thermal operating range, output current ratings, and supply voltage specifications. They maintain the same 56-BSSOP package and surface mount configuration. Base product numbers differ, but functional compatibility is maintained within the specified parameter envelope.
Q: Why should the 74FCT series equivalents be avoided?
A: The 74FCT series parts (CY74FCT16646CTPVCT, CY74FCT16543CTPVCT, CY74FCT16652ATPVCT) are classified as obsolete. While they meet ROHS3 compliance and share electrical parameters, their discontinued status creates long-term supply risk and procurement uncertainty.
Q: What is the MSL rating for substitute parts?
A: All substitute parts maintain MSL 1 (Unlimited) moisture sensitivity level, matching the original 74ABT16646CSSCX specification.
Q: Are all substitute parts REACH compliant?
A: Yes. All listed substitute parts maintain REACH Unaffected status, consistent with the original part specification.
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