SC16C554DIB64,151 Equivalent & Substitute Parts

Part Overview

The SC16C554DIB64,151 is a quad UART interface IC manufactured by NXP USA Inc., featuring four channels with 16-byte FIFO buffers, 64-LQFP surface mount packaging, and support for multiple supply voltages (2.5V, 3.3V, 5V). This component integrates auto flow control, IrDA encoder/decoder, false start bit detection, and modem control capabilities with a maximum data rate of 5 Mbps. The part is classified as obsolete, making equivalent and substitute components necessary for ongoing system support and new design implementations.

Key Parameters

Parameter	SC16C554DIB64,151
Manufacturer	NXP USA Inc.
Number of Channels	4 (QUART)
FIFO Size	16 Byte
Package / Case	64-LQFP (10x10)
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
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the SC16C554DIB64,151 is determined by the following critical parameters:

Mandatory Compatibility Parameters:

Package type: 64-LQFP (10x10) surface mount
Number of channels: 4 (QUART configuration)
FIFO buffer size: 16 Byte minimum
Auto flow control capability: Required
False start bit detection: Required
Modem control support: Required
Voltage supply compatibility: Minimum 2.5V to 5V range support

Functional Enhancement Parameters:

IrDA encoder/decoder support (present in main part)
Data rate capability (5 Mbps in main part)
Protocol support (RS232, RS485 variants acceptable)

Substitute parts are grouped into two categories:

Category A - Direct 16-Byte FIFO Equivalents: ST16C554 series parts (ST16C554CQ64-F, ST16C554DCQ64-F, ST16C554DIQ64-F, ST16C554DIQ64TR-F) and TL16CP554APM. These maintain identical FIFO depth and channel configuration.

Category B - Enhanced 64-Byte FIFO Variants: ST16C654 series parts (ST16C654CQ64-F, ST16C654DCQ64-F, ST16C654DIQ64-F, ST16C654IQ64-F) and XR16C854CV-F. These provide increased FIFO capacity and enhanced protocol support while maintaining core functional requirements.

Parameter Comparison

Parameter	SC16C554DIB64,151	ST16C554CQ64-F	ST16C554DCQ64-F	ST16C554DIQ64-F	ST16C554DIQ64TR-F	TL16CP554APM
Manufacturer	NXP USA Inc.	MaxLinear, Inc.	MaxLinear, Inc.	MaxLinear, Inc.	MaxLinear, Inc.	Texas Instruments
Number of Channels	4 (QUART)	4 (QUART)	4 (QUART)	4 (QUART)	4 (QUART)	4 (QUART)
FIFO Size	16 Byte	16 Byte	16 Byte	16 Byte	16 Byte	16 Byte
Package / Case	64-LQFP	64-LQFP	64-LQFP	64-LQFP	64-LQFP	64-LQFP
Data Rate (Max)	5 Mbps	1.5 Mbps	1.5 Mbps	1.5 Mbps	1.5 Mbps	1 Mbps
Voltage - Supply	2.5V, 3.3V, 5V	2.97V ~ 5.5V	2.97V ~ 5.5V	2.97V ~ 5.5V	2.97V ~ 5.5V	3V ~ 5.25V
Auto Flow Control	Yes	Yes	Yes	Yes	Yes	Yes
IrDA Encoder/Decoder	Yes	No	No	No	No	No
False Start Bit Detection	Yes	Yes	Yes	Yes	Yes	Yes
Modem Control	Yes	Yes	Yes	Yes	Yes	Yes
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)
Product Status	Obsolete	Active	Active	Active	Active	Obsolete

Parameter	SC16C554DIB64,151	ST16C654CQ64-F	ST16C654DCQ64-F	ST16C654DIQ64-F	ST16C654IQ64-F	XR16C854CV-F
Manufacturer	NXP USA Inc.	MaxLinear, Inc.	MaxLinear, Inc.	MaxLinear, Inc.	MaxLinear, Inc.	MaxLinear, Inc.
Number of Channels	4 (QUART)	4 (QUART)	4 (QUART)	4 (QUART)	4 (QUART)	4 (QUART)
FIFO Size	16 Byte	64 Byte	64 Byte	64 Byte	64 Byte	128 Byte
Package / Case	64-LQFP	64-LQFP	64-LQFP	64-LQFP	64-LQFP	64-LQFP
Data Rate (Max)	5 Mbps	1.5 Mbps	1.5 Mbps	1.5 Mbps	1.5 Mbps	2 Mbps
Voltage - Supply	2.5V, 3.3V, 5V	2.97V ~ 5.5V	2.97V ~ 5.5V	2.97V ~ 5.5V	2.97V ~ 5.5V	2.97V ~ 5.5V
Auto Flow Control	Yes	Yes	Yes	Yes	Yes	Yes
IrDA Encoder/Decoder	Yes	Yes	Yes	Yes	Yes	Yes
False Start Bit Detection	Yes	Yes	Yes	Yes	Yes	Yes
Modem Control	Yes	Yes	Yes	Yes	Yes	Yes
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Protocol Support	RS232	RS232	RS232	RS232	RS232	RS232, RS485
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)
Product Status	Obsolete	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Substitutes (16-Byte FIFO Category):

ST16C554DIQ64-F and ST16C554DIQ64TR-F are the preferred direct equivalents. Both are manufactured by MaxLinear, Inc. with active product status, ensuring long-term availability and support. These parts maintain identical channel count, FIFO depth, and package configuration. The ST16C554DIQ64TR-F variant in Tape & Reel packaging is suitable for high-volume automated assembly. Both comply with ROHS3 standards and carry EAR99 ECCN classification matching the original part.

ST16C554CQ64-F and ST16C554DCQ64-F provide equivalent functionality in Tray packaging, with ST16C554DCQ64-F offering the highest inventory availability (6176 units). These are suitable for applications where packaging format flexibility is acceptable.

TL16CP554APM, manufactured by Texas Instruments, is an obsolete alternative with lower maximum data rate (1 Mbps) and reduced voltage supply range (3V ~ 5.25V). This part is not recommended for new designs due to obsolete status.

Enhanced Substitutes (64-Byte FIFO Category):

ST16C654DIQ64-F, ST16C654IQ64-F, ST16C654CQ64-F, and ST16C654DCQ64-F provide increased FIFO capacity (64 Byte) while maintaining all core functional requirements including IrDA encoder/decoder support. These parts are suitable for applications requiring deeper buffering. All variants are active products with ROHS3 compliance and EAR99 ECCN classification.

Advanced Substitute (128-Byte FIFO Category):

XR16C854CV-F offers the highest FIFO capacity (128 Byte) with extended protocol support (RS232 and RS485). This part is suitable for applications requiring enhanced serial communication capabilities and deeper buffering. It maintains active product status, ROHS3 compliance, and EAR99 ECCN classification.

Compliance Considerations:

All recommended substitutes maintain MSL Level 3 (168 Hours) moisture sensitivity rating, ROHS3 compliance, and REACH unaffected status, ensuring compatibility with existing manufacturing and environmental requirements.

Frequently Asked Questions (FAQ)

Q: Can ST16C554 series parts directly replace the SC16C554DIB64,151?

A: Yes. ST16C554DIQ64-F and ST16C554DIQ64TR-F are direct functional equivalents. Both maintain the same 4-channel QUART configuration, 16-byte FIFO depth, 64-LQFP package, and all required control features (auto flow control, false start bit detection, modem control). The primary difference is manufacturer (MaxLinear vs. NXP) and active product status, which ensures ongoing availability.

Q: What is the difference between 16-byte and 64-byte FIFO variants?

A: FIFO depth determines buffering capacity. The 16-byte FIFO in the original SC16C554DIB64,151 and ST16C554 series is suitable for standard serial communication applications. The 64-byte FIFO in ST16C654 series provides deeper buffering for applications with higher data throughput or interrupt latency requirements. Both maintain identical channel count, package, and core functionality.

Q: Are there packaging format differences between substitute parts?

A: Yes. ST16C554DIQ64-F is supplied in Tray packaging, while ST16C554DIQ64TR-F uses Tape & Reel (TR) format. Tape & Reel packaging is optimized for automated pick-and-place assembly in high-volume production. Tray packaging is suitable for manual assembly or lower-volume applications. Both formats contain identical components.

Q: Does the XR16C854CV-F offer advantages over ST16C554 series?

A: XR16C854CV-F provides three enhancements: 128-byte FIFO (vs. 16-byte), dual protocol support (RS232 and RS485), and higher data rate (2 Mbps vs. 1.5 Mbps). These enhancements are beneficial for applications requiring extended buffering, multi-protocol communication, or higher serial data rates. The 64-LQFP package remains identical.

Q: What is the impact of lower maximum data rates in substitute parts?

A: The original SC16C554DIB64,151 supports 5 Mbps maximum data rate. Most ST16C554 series substitutes support 1.5 Mbps, while TL16CP554APM supports 1 Mbps. For applications operating below these thresholds, the reduced data rate specification has no functional impact. Applications requiring data rates above 1.5 Mbps should consider XR16C854CV-F (2 Mbps) or evaluate system requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. All recommended substitute parts comply with RoHS standards. Most carry ROHS3 Compliant certification. ST16C554DIQ64TR-F and ST16C654DIQ64-F carry RoHS Compliant certification. Both certifications meet current environmental and regulatory requirements.

Q: Can I use ST16C654 series parts as drop-in replacements?

A: ST16C654 series parts are functionally compatible but not true drop-in replacements due to increased FIFO depth (64-byte vs. 16-byte). Firmware or driver software may require adjustment to utilize the larger buffer. However, the parts are backward compatible at the hardware interface level and will function in existing 64-LQFP socket configurations.

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