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SC16C554IB64,128 Equivalent & Substitute Parts
Part Overview
The SC16C554IB64,128 is a quad UART interface IC manufactured by NXP USA Inc., featuring four independent serial channels with 16-byte FIFOs, operating across 2.5V, 3.3V, and 5V supply voltages. This component integrates auto flow control, IrDA encoder/decoder, false start bit detection, and modem control capabilities in a 64-LQFP surface mount package. The part is classified as obsolete, making equivalent and substitute components necessary for ongoing system support and new design implementations.
Substiute Parts
Key Parameters
| Parameter | SC16C554IB64,128 |
|---|---|
| Manufacturer | NXP USA Inc. |
| Number of Channels | 4 (QUART) |
| FIFO Size | 16 Byte |
| Data Rate (Max) | 5 Mbps |
| Voltage Supply | 2.5V, 3.3V, 5V |
| Auto Flow Control | Yes |
| IrDA Encoder/Decoder | Yes |
| False Start Bit Detection | Yes |
| Modem Control | Yes |
| Package / Case | 64-LQFP (10x10) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| MSL Rating | 3 (168 Hours) |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution of the SC16C554IB64,128 is determined by the following critical parameters: quad channel configuration (4 QUART), 64-LQFP package form factor, surface mount technology, and functional feature set including auto flow control, false start bit detection, and modem control. FIFO depth, data rate capability, and supply voltage range define substitution tiers.
Substitute parts are grouped into two categories:
Category A: 16-Byte FIFO Equivalents — Direct functional replacements with identical 16-byte FIFO depth, maintaining the same data buffering capacity. These parts preserve the original design's serial channel architecture.
Category B: 64-Byte FIFO Enhanced Substitutes — Parts with expanded 64-byte FIFO capacity, offering increased buffering capability while maintaining quad-channel architecture and 64-LQFP packaging. These provide performance enhancement over the original specification.
Category C: 128-Byte FIFO Advanced Substitutes — Parts with 128-byte FIFO depth, representing the highest buffering capacity available in the 64-LQFP quad UART family, suitable for high-throughput serial applications.
Parameter Comparison
| Part Number | Manufacturer | Channels | FIFO (Bytes) | Data Rate (Max) | Supply Voltage | IrDA | Product Status | Packaging |
|---|---|---|---|---|---|---|---|---|
| SC16C554IB64,128 | NXP USA Inc. | 4 | 16 | 5 Mbps | 2.5V, 3.3V, 5V | Yes | Obsolete | Tray |
| ST16C554CQ64-F | MaxLinear, Inc. | 4 | 16 | 1.5 Mbps | 2.97V ~ 5.5V | No | Active | Tray |
| ST16C554DCQ64-F | MaxLinear, Inc. | 4 | 16 | 1.5 Mbps | 2.97V ~ 5.5V | No | Active | Tray |
| ST16C554DIQ64-F | MaxLinear, Inc. | 4 | 16 | 1.5 Mbps | 2.97V ~ 5.5V | No | Active | Tray |
| ST16C554DIQ64TR-F | MaxLinear, Inc. | 4 | 16 | 1.5 Mbps | 2.97V ~ 5.5V | No | Active | Tape & Reel |
| ST16C654CQ64-F | MaxLinear, Inc. | 4 | 64 | 1.5 Mbps | 2.97V ~ 5.5V | Yes | Active | Tray |
| ST16C654DCQ64-F | MaxLinear, Inc. | 4 | 64 | 1.5 Mbps | 2.97V ~ 5.5V | Yes | Active | Tray |
| ST16C654DIQ64-F | MaxLinear, Inc. | 4 | 64 | 1.5 Mbps | 2.97V ~ 5.5V | Yes | Active | Tray |
| ST16C654IQ64-F | MaxLinear, Inc. | 4 | 64 | 1.5 Mbps | 2.97V ~ 5.5V | Yes | Active | Tray |
| TL16CP554APM | Texas Instruments | 4 | 16 | 1 Mbps | 3V ~ 5.25V | No | Obsolete | Tray |
| XR16C854CV-F | MaxLinear, Inc. | 4 | 128 | 2 Mbps | 2.97V ~ 5.5V | Yes | Active | Tray |
Engineering Selection Recommendations
For Direct Replacement (16-Byte FIFO, Active Status): ST16C554DIQ64-F and ST16C554DCQ64-F are active production parts from MaxLinear, Inc., offering the highest inventory availability (6,176 and 20,200 units respectively). Both maintain quad-channel architecture with 16-byte FIFO depth and are ROHS3 compliant. ST16C554DIQ64-F is available in both Tray and Tape & Reel packaging options. These parts operate within the 2.97V to 5.5V supply range, covering the original 2.5V, 3.3V, and 5V specifications. Note that IrDA encoder/decoder functionality is not present in these variants.
For Enhanced Buffering (64-Byte FIFO, Active Status): ST16C654IQ64-F, ST16C654CQ64-F, ST16C654DCQ64-F, and ST16C654DIQ64-F provide 64-byte FIFO capacity with IrDA encoder/decoder support, matching the original part's feature set. All are ROHS3 compliant and operate within 2.97V to 5.5V. ST16C654DIQ64-F offers the highest inventory (1,600 units). These parts are suitable for applications requiring increased serial data buffering without changing the 64-LQFP package footprint.
For Advanced Buffering (128-Byte FIFO, Active Status): XR16C854CV-F from MaxLinear, Inc., provides 128-byte FIFO depth with RS232 and RS485 protocol support, IrDA encoder/decoder, and the highest inventory availability (10,600 units). This part operates at 2 Mbps maximum data rate and is ROHS3 compliant. The 128-byte FIFO is appropriate for high-throughput serial applications while maintaining the 64-LQFP package form factor.
Obsolete Alternative: TL16CP554APM from Texas Instruments is an obsolete part with 16-byte FIFO and 1 Mbps maximum data rate. This part lacks IrDA functionality and operates within 3V to 5.25V. Use is not recommended for new designs due to obsolete status.
Frequently Asked Questions (FAQ)
Q: Can ST16C554 series parts directly replace the SC16C554IB64,128? A: ST16C554 variants maintain quad-channel architecture, 16-byte FIFO depth, and 64-LQFP packaging. However, they lack IrDA encoder/decoder functionality present in the original part. Verify that your application does not require IrDA support before substitution.
Q: What is the difference between ST16C554DIQ64-F and ST16C554DCQ64-F? A: Both parts are functionally identical with 16-byte FIFO, quad channels, and identical electrical specifications. ST16C554DIQ64-F is available in both Tray and Tape & Reel packaging, while ST16C554DCQ64-F is supplied in Tray only. Select based on your assembly process requirements.
Q: Should I use ST16C654 (64-byte FIFO) instead of ST16C554 (16-byte FIFO)? A: ST16C654 variants provide four times the FIFO depth and restore IrDA encoder/decoder functionality matching the original part. Use ST16C654 if your application benefits from increased buffering capacity or requires IrDA support. The 64-LQFP package footprint remains identical.
Q: Is XR16C854CV-F compatible with designs using SC16C554IB64,128? A: XR16C854CV-F maintains quad-channel architecture and 64-LQFP packaging with enhanced 128-byte FIFO and RS485 protocol support. It is pin-compatible and suitable for applications requiring higher data throughput. Verify that your PCB layout and firmware support the increased FIFO depth.
Q: What supply voltage range should I verify for substitution? A: The original part operates at 2.5V, 3.3V, and 5V. MaxLinear ST16C554 and ST16C654 variants operate within 2.97V to 5.5V, which covers all original specifications. Verify your system's actual supply voltage tolerance before substitution.
Q: Are all substitute parts RoHS compliant? A: All active production substitute parts listed (ST16C554 and ST16C654 series, XR16C854CV-F) are ROHS3 compliant. TL16CP554APM is also ROHS3 compliant but is obsolete. Verify compliance requirements for your specific application and region.
Q: What is the maximum data rate difference between parts? A: The original SC16C554IB64,128 supports 5 Mbps. ST16C554 and ST16C654 variants support 1.5 Mbps, while XR16C854CV-F supports 2 Mbps. Confirm that your application's serial communication speed does not exceed the substitute part's maximum data rate.
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