ST16C554DIJ68-F Equivalent & Substitute Parts

Part Overview

The ST16C554DIJ68-F is a quad UART interface IC with 16-byte FIFO, designed for RS232 serial communication applications. Manufactured by MaxLinear, Inc., this component operates across a supply voltage range of 2.97V to 5.5V and supports data rates up to 1.5 Mbps with integrated modem control and false start bit detection. The part is currently classified as obsolete, making equivalent substitute parts necessary for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Manufacturer Part Number	ST16C554DIJ68-F
Manufacturer	MaxLinear, Inc.
Category	Interface
Description	IC UART FIFO 16B QUAD 68PLCC
Number of Channels	4 (QUART)
FIFO Size	16 Byte
Protocol	RS232
Data Rate (Max)	1.5 Mbps
Voltage - Supply	2.97V ~ 5.5V
Auto Flow Control	Yes
False Start Bit Detection	Yes
Modem Control	Yes
Package / Case	68-LCC (J-Lead)
Mounting Type	Surface Mount
RoHS Status	RoHS Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the ST16C554DIJ68-F is determined by the following critical parameters:

Primary Compatibility Criteria:

Number of Channels: 4 (QUART)
FIFO Size: 16 Byte
Modem Control: Yes
False Start Bit Detection: Yes
Mounting Type: Surface Mount
Package / Case: 68-LCC (J-Lead) with 68-PLCC (24.23x24.23) footprint

Voltage Compatibility Range:

Main part operates at 2.97V ~ 5.5V
Substitute parts must support overlapping voltage ranges

Data Rate Consideration:

Main part supports 1.5 Mbps maximum
Substitute parts operating at 1 Mbps are functionally compatible for RS232 applications

Substitute parts are grouped into two categories based on voltage supply specifications and auto flow control availability. All listed substitutes maintain identical channel count, FIFO depth, package footprint, and core modem control features.

Parameter Comparison

Parameter	ST16C554DIJ68-F	ST16C554DIQ64-F	TL16C554AFN	TL16C554AFNR	TL16C554AIFN	TL16C554AIFNR	TL16C554FN	TL16C554FNR	TL16C554IFN	TL16C554IFNR
Manufacturer	MaxLinear	MaxLinear	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Number of Channels	4 (QUART)	4 (QUART)	4 (QUART)	4 (QUART)	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	16 Byte	16 Byte	16 Byte	16 Byte
Data Rate (Max)	1.5 Mbps	1.5 Mbps	1 Mbps	1 Mbps	1 Mbps	1 Mbps	1 Mbps	1 Mbps	1 Mbps	1 Mbps
Voltage - Supply	2.97V ~ 5.5V	2.97V ~ 5.5V	3V ~ 5.25V	3V ~ 5.25V	3V ~ 5.25V	3V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V
Auto Flow Control	Yes	Yes	Yes	Yes	Yes	Yes	No	No	No	No
False Start Bit Detection	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Modem Control	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Package / Case	68-LCC (J-Lead)	64-LQFP	68-LCC (J-Lead)	68-LCC (J-Lead)	68-LCC (J-Lead)	68-LCC (J-Lead)	68-LCC (J-Lead)	68-LCC (J-Lead)	68-LCC (J-Lead)	68-LCC (J-Lead)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Recommendation: ST16C554DIQ64-F

The ST16C554DIQ64-F from MaxLinear represents the manufacturer's direct successor, maintaining identical electrical specifications (2.97V ~ 5.5V, 1.5 Mbps, 16-byte FIFO, 4 channels) while transitioning to a 64-LQFP package. This part is currently active and ROHS3 compliant. Selection of this part requires PCB redesign to accommodate the different package footprint.

Secondary Recommendation: TL16C554AIFN / TL16C554AIFNR

Texas Instruments TL16C554AIFN and TL16C554AIFNR maintain the 68-PLCC footprint, enabling direct socket compatibility with the original ST16C554DIJ68-F. Both parts are active, ROHS3 compliant, and support auto flow control. Voltage range is 3V ~ 5.25V, which overlaps with the main part's operating range. Data rate is specified at 1 Mbps, suitable for standard RS232 applications.

Alternative Recommendation: TL16C554AFN / TL16C554AFNR

TL16C554AFN and TL16C554AFNR provide identical footprint compatibility and feature set to the AIFN variants, with the same voltage and data rate specifications. These parts are active and ROHS3 compliant.

Limited Compatibility: TL16C554FN / TL16C554FNR / TL16C554IFN / TL16C554IFNR

These Texas Instruments variants maintain 68-PLCC footprint and core functionality but operate at a narrower voltage range (4.75V ~ 5.25V) and lack auto flow control. Selection is appropriate only for applications that do not require the extended lower voltage operation or automatic flow control features of the main part.

Frequently Asked Questions (FAQ)

Q: Can ST16C554DIQ64-F be used as a direct replacement for ST16C554DIJ68-F?

A: ST16C554DIQ64-F is electrically equivalent but uses a different package (64-LQFP vs. 68-PLCC). Direct socket substitution is not possible; PCB redesign is required. The part maintains identical channel count, FIFO depth, voltage range, and maximum data rate.

Q: What is the key difference between TL16C554AIFN and TL16C554FN?

A: Both maintain the 68-PLCC footprint and 16-byte FIFO with 4 channels. The primary differences are: TL16C554AIFN supports auto flow control and operates at 3V ~ 5.25V, while TL16C554FN lacks auto flow control and operates at 4.75V ~ 5.25V. Selection depends on application voltage requirements and flow control necessity.

Q: Are all Texas Instruments TL16C554 variants pin-compatible with the ST16C554DIJ68-F?

A: All listed Texas Instruments substitutes maintain the 68-PLCC (24.23x24.23) package footprint, providing mechanical and electrical pin compatibility. However, voltage supply ranges vary. Verify that your application's supply voltage falls within the substitute part's specified range.

Q: What does the packaging designation (Tube, Tape & Reel, Cut Tape) mean for substitution?

A: Packaging designation refers to the form factor for component delivery and does not affect electrical or mechanical compatibility. Tube, Tape & Reel (TR), and Cut Tape (CT) variants of the same part number are functionally identical. Selection is based on procurement and assembly requirements.

Q: Why does ST16C554DIJ68-F have a higher maximum data rate (1.5 Mbps) than most Texas Instruments substitutes (1 Mbps)?

A: The data rate specification reflects the maximum supported baud rate for each device. For standard RS232 serial communication, 1 Mbps is sufficient for typical applications. The lower specification in Texas Instruments parts does not indicate reduced functionality but rather different design specifications.

Q: Is the ST16C554DIJ68-F RoHS compliant?

A: Yes, ST16C554DIJ68-F is RoHS compliant. All listed substitute parts are ROHS3 compliant, meeting current environmental and regulatory requirements.

Q: Can I use a substitute part with a narrower voltage range in my application?

A: Only if your application's supply voltage falls entirely within the substitute part's specified range. For example, TL16C554FN operates at 4.75V ~ 5.25V. If your system requires operation below 4.75V, this part is not suitable. Verify your application's voltage requirements before selection.

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