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74ACTQ16543SSC Equivalent & Substitute Parts
Part Overview
The 74ACTQ16543SSC is a non-inverting transceiver IC manufactured by onsemi, featuring 2 elements with 8 bits per element and 3-state output capability. This 56-SSOP surface mount device operates across a 4.5V to 5.5V supply range and is rated for -40°C to 85°C operating temperature. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring compatible functionality.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 74ACTQ16543SSC |
| Manufacturer | onsemi |
| Logic Type | Transceiver, Non-Inverting |
| Number of Elements | 2 |
| 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) |
| Mounting Type | Surface Mount |
| Package / Case | 56-BSSOP (0.295", 7.50mm Width) |
| Supplier Device Package | 56-SSOP |
| Product Status | Obsolete |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution for the 74ACTQ16543SSC 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: 24mA, 24mA
- Voltage - Supply: 4.5V ~ 5.5V
- Operating Temperature: -40°C ~ 85°C (TA)
- Mounting Type: Surface Mount
- Package / Case: 56-BSSOP (0.295", 7.50mm Width)
- Supplier Device Package: 56-SSOP
Substitute parts are grouped into two categories: direct pin-compatible replacements (same base part number variants from different manufacturers) and parametric equivalents (different base part numbers with identical electrical and mechanical specifications).
Parameter Comparison
| Part Number | Manufacturer | Logic Type | Elements | Bits/Element | Output Type | Current (mA) | Supply Voltage | Temp Range | Package | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 74ACTQ16543SSC | onsemi | Non-Inverting | 2 | 8 | 3-State | 24/24 | 4.5-5.5V | -40 to 85°C | 56-BSSOP | Obsolete | REACH Unaffected |
| 74ACT16543DGGR | Texas Instruments | Non-Inverting | 2 | 8 | 3-State | 24/24 | 4.5-5.5V | -40 to 85°C | 56-TFSOP | Active | ROHS3 Compliant |
| 74ACT16543DLR | Texas Instruments | Non-Inverting | 2 | 8 | 3-State | 24/24 | 4.5-5.5V | -40 to 85°C | 56-BSSOP | Active | ROHS3 Compliant |
| 74ACT16543DL | Texas Instruments | Non-Inverting | 2 | 8 | 3-State | 24/24 | 4.5-5.5V | -40 to 85°C | 56-BSSOP | Last Time Buy | ROHS3 Compliant |
| 74ACT16646DL | Texas Instruments | Non-Inverting | 2 | 8 | 3-State | 24/24 | 4.5-5.5V | -40 to 85°C | 56-BSSOP | Last Time Buy | ROHS3 Compliant |
| 74ACT16651DL | Texas Instruments | Non-Inverting | 2 | 8 | 3-State | 24/24 | 4.5-5.5V | -40 to 85°C | 56-BSSOP | Active | ROHS3 Compliant |
| 74ACT16652DL | Texas Instruments | Non-Inverting | 2 | 8 | 3-State | 24/24 | 4.5-5.5V | -40 to 85°C | 56-BSSOP | Last Time Buy | ROHS3 Compliant |
| CY74FCT162543CTPVC | Texas Instruments | Non-Inverting | 2 | 8 | 3-State | 24/24 | 4.5-5.5V | -40 to 85°C | 56-BSSOP | Obsolete | ROHS3 Compliant |
| CY74FCT162543TPVC | Texas Instruments | Non-Inverting | 2 | 8 | 3-State | 24/24 | 4.5-5.5V | -40 to 85°C | 56-BSSOP | Obsolete | ROHS3 Compliant |
| CY74FCT162646ATPVC | Texas Instruments | Non-Inverting | 2 | 8 | 3-State | 24/24 | 4.5-5.5V | -40 to 85°C | 56-BSSOP | Obsolete | ROHS3 Compliant |
| CY74FCT162646CTPVC | Texas Instruments | Non-Inverting | 2 | 8 | 3-State | 24/24 | 4.5-5.5V | -40 to 85°C | 56-BSSOP | Obsolete | ROHS3 Compliant |
Engineering Selection Recommendations
For new designs, 74ACT16543DLR (Texas Instruments, Active status) is the primary selection, offering identical electrical and mechanical specifications with current product support and ROHS3 compliance. This part maintains the same 56-BSSOP package footprint as the original 74ACTQ16543SSC.
For applications requiring Last Time Buy inventory, 74ACT16543DL provides equivalent functionality with Tube packaging. The 74ACT16651DL variant offers Active product status with identical parametric specifications and is suitable for long-term production requirements.
The 74ACT16543DGGR variant uses a 56-TFSOP package (0.240", 6.10mm width) instead of 56-BSSOP, requiring PCB layout modification but offering Active product status from Texas Instruments.
Parametric equivalents 74ACT16646DL and 74ACT16652DL maintain full electrical and mechanical compatibility but carry Last Time Buy status. The CY74FCT162 series (CY74FCT162543CTPVC, CY74FCT162543TPVC, CY74FCT162646ATPVC, CY74FCT162646CTPVC) are obsolete alternatives with identical specifications, suitable only for legacy system maintenance.
All recommended substitutes maintain ROHS3 compliance and REACH Unaffected status, matching the regulatory profile of the original part.
Frequently Asked Questions (FAQ)
Q: Can 74ACT16543DLR directly replace 74ACTQ16543SSC without PCB modification?
A: Yes. Both parts use the 56-BSSOP package with identical 0.295" width and 7.50mm dimensions. Pin configuration, electrical specifications, and thermal characteristics are equivalent. No PCB layout changes are required.
Q: What is the difference between 74ACT16543DLR and 74ACT16543DGGR?
A: The primary difference is package type. 74ACT16543DLR uses 56-BSSOP (0.295" width), while 74ACT16543DGGR uses 56-TFSOP (0.240" width). Both maintain identical electrical performance and operating parameters. PCB footprint modification is necessary when switching between these variants.
Q: Why are some substitute parts marked as Obsolete or Last Time Buy?
A: Product status reflects manufacturer lifecycle stage. Obsolete parts have reached end-of-life with no further production. Last Time Buy parts are in final production phases. For new designs, Active status parts (74ACT16543DLR, 74ACT16651DL) are recommended to ensure long-term availability and supply chain stability.
Q: Are all listed substitutes ROHS3 compliant?
A: All Texas Instruments substitutes listed carry ROHS3 Compliant status. The original 74ACTQ16543SSC is REACH Unaffected. All substitutes maintain REACH Unaffected status, ensuring regulatory compatibility across applications.
Q: Can CY74FCT162 series parts be used as direct replacements?
A: CY74FCT162543CTPVC, CY74FCT162543TPVC, CY74FCT162646ATPVC, and CY74FCT162646CTPVC are parametrically equivalent with identical electrical and mechanical specifications. However, all are marked Obsolete. These parts are suitable only for legacy system maintenance where existing inventory exists. For new production, Active status alternatives are required.
Q: What output current specifications apply to all substitute parts?
A: All listed substitutes maintain 24mA output current for both high and low states, matching the original 74ACTQ16543SSC specification. This ensures equivalent drive capability across all recommended alternatives.
Q: Is packaging the only difference between substitute variants?
A: Packaging and product status are the primary differentiators. All substitutes maintain identical electrical specifications (supply voltage 4.5V-5.5V, operating temperature -40°C to 85°C, 3-state output, 2 elements with 8 bits per element). Packaging options include 56-BSSOP and 56-TFSOP, with corresponding footprint implications for PCB design.
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