XR68M752IM48-F Equivalent & Substitute Parts

Part Overview

The XR68M752IM48-F is a dual-channel UART interface IC with 64-byte FIFO, manufactured by MaxLinear, Inc. This surface-mount component operates across a supply voltage range of 1.62V to 3.63V and supports RS232, RS422, and RS485 protocols at data rates up to 16Mbps. The device includes internal oscillator, timer/counter functionality, auto flow control, IrDA encoder/decoder, false start bit detection, and modem control features. Currently in active product status with 1829 units in stock, this component is widely used in serial communication applications requiring dual-channel UART functionality with advanced protocol support.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative packaging or supply chain options are required, or when design flexibility demands component selection from multiple manufacturers while maintaining functional compatibility.

Key Parameters

Parameter	XR68M752IM48-F
Manufacturer	MaxLinear, Inc.
Number of Channels	2 (DUART)
FIFO Size	64 Byte
Protocol Support	RS232, RS422, RS485
Data Rate (Max)	16Mbps
Supply Voltage	1.62V ~ 3.63V
Package / Case	48-TQFP (7x7)
Auto Flow Control	Yes
IrDA Encoder/Decoder	Yes
False Start Bit Detection	Yes
Modem Control	Yes
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the XR68M752IM48-F is determined by the following critical parameters:

Primary Compatibility Criteria:

Dual-channel UART (DUART) architecture
64-byte FIFO capacity
48-pin package footprint (48-TQFP or 48-LQFP)
Auto flow control capability
False start bit detection
Modem control support
ROHS3 compliance

Secondary Compatibility Considerations:

Supply voltage range compatibility
Maximum data rate capability
Protocol support (RS232, RS422, RS485)
IrDA encoder/decoder presence
Packaging format (Tray, Tape & Reel, Cut Tape)
Product status (Active vs. Obsolete)
Moisture sensitivity level

Substitute parts are grouped into two categories: parametric equivalents from the same manufacturer (MaxLinear) and manufacturer-recommended alternatives from NXP Semiconductors and Texas Instruments. All listed substitutes maintain the core dual-channel UART functionality with 64-byte FIFO and 48-pin package configuration.

Parameter Comparison

Part Number	Manufacturer	Channels	FIFO (Byte)	Package	Data Rate (Max)	Supply Voltage	Protocol	Auto Flow Control	False Start Bit Detection	Modem Control	Product Status	RoHS
XR68M752IM48-F	MaxLinear, Inc.	2	64	48-TQFP	16Mbps	1.62V ~ 3.63V	RS232, RS422, RS485	Yes	Yes	Yes	Active	ROHS3
XR16M752IM48-F	MaxLinear, Inc.	2	64	48-TQFP	16Mbps	1.62V ~ 3.63V	RS232, RS422, RS485	Yes	Yes	Yes	Active	ROHS3
SC16C752BIB48,128	NXP Semiconductors	2	64	48-LQFP	5Mbps	2.5V, 3.3V, 5V	—	Yes	Yes	Yes	Active	ROHS3
SC16C752BIB48,151	NXP USA Inc.	2	64	48-LQFP	5Mbps	2.5V, 3.3V, 5V	—	Yes	Yes	Yes	Obsolete	ROHS3
SC16C752BIB48,157	NXP USA Inc.	2	64	48-LQFP	5Mbps	2.5V, 3.3V, 5V	—	Yes	Yes	Yes	Obsolete	ROHS3
TL16C752BLPTREP	Texas Instruments	2	64	48-LQFP	3Mbps	2.7V ~ 3.6V	—	Yes	Yes	Yes	Active	ROHS3
TL16C752BTPTREP	Texas Instruments	2	64	48-LQFP	3Mbps	2.7V ~ 3.6V	—	Yes	Yes	Yes	Active	ROHS3
TL16C752CIPFB	Texas Instruments	2	64	48-TQFP	3Mbps	1.62V ~ 5.5V	RS485	Yes	Yes	Yes	Active	ROHS3
TL16C752CPFB	Texas Instruments	2	64	48-TQFP	3Mbps	1.62V ~ 5.5V	RS485	Yes	Yes	Yes	Active	ROHS3

Engineering Selection Recommendations

MaxLinear Parametric Equivalents (Preferred for Direct Substitution): The XR16M752IM48-F maintains identical electrical specifications and package configuration to the XR68M752IM48-F, offering seamless substitution within the same manufacturer ecosystem. Both devices are in active product status with ROHS3 compliance and equivalent MSL ratings.

NXP Semiconductors SC16C752 Series (Active Status): The SC16C752BIB48,128 is the only NXP option in active product status. This part maintains dual-channel UART architecture, 64-byte FIFO, and all required control features. The package transitions from 48-TQFP to 48-LQFP, requiring PCB layout verification. Maximum data rate reduces to 5Mbps, and supply voltage range narrows to 2.5V, 3.3V, and 5V discrete levels. MSL rating improves to 1 (Unlimited). This option is suitable for applications not requiring the full 16Mbps data rate capability.

NXP Semiconductors SC16C752 Series (Obsolete Status): SC16C752BIB48,151 and SC16C752BIB48,157 are obsolete products with limited inventory (1214 and 949 units respectively). These parts should be avoided for new designs due to end-of-life status, though they remain available for legacy system maintenance.

Texas Instruments TL16C752 Series (Active Status): TL16C752BLPTREP and TL16C752BTPTREP offer active product status with 48-LQFP packaging. Maximum data rate is 3Mbps with supply voltage range of 2.7V to 3.6V. These options are suitable for 3.3V-centric designs with lower bandwidth requirements.

TL16C752CIPFB and TL16C752CPFB provide 48-TQFP packaging matching the original device footprint, with extended supply voltage range (1.62V to 5.5V) and RS485 protocol support. Maximum data rate remains 3Mbps. These options are optimal for designs requiring package compatibility and wide supply voltage tolerance.

All substitute parts maintain ROHS3 compliance and are suitable for applications requiring dual-channel UART functionality with 64-byte FIFO and modem control features.

Frequently Asked Questions (FAQ)

Q: Can I substitute the XR68M752IM48-F with the XR16M752IM48-F? A: Yes. The XR16M752IM48-F is a parametric equivalent from MaxLinear with identical electrical specifications, package configuration, and feature set. Both devices support 16Mbps data rates, operate across 1.62V to 3.63V supply voltage, and include all required control features. This is the preferred direct substitution option.

Q: What is the primary difference between 48-TQFP and 48-LQFP packages? A: Both packages contain 48 pins in a 7x7mm footprint but differ in lead geometry. TQFP (Thin Quad Flat Pack) features gull-wing leads, while LQFP (Low-profile Quad Flat Pack) also uses gull-wing leads with slightly different dimensional specifications. PCB layout and solder reflow profiles may require adjustment when transitioning between these package types. Consult the respective device datasheets for precise footprint dimensions.

Q: Why do NXP and Texas Instruments substitutes have lower maximum data rates? A: The SC16C752 series from NXP supports 5Mbps maximum, while TL16C752 series from Texas Instruments supports 3Mbps maximum. These specifications reflect the design architecture and internal oscillator capabilities of each manufacturer's implementation. Applications requiring the full 16Mbps capability of the XR68M752IM48-F must use MaxLinear devices or verify that lower data rates are acceptable for the intended application.

Q: Are obsolete parts suitable for new designs? A: No. SC16C752BIB48,151 and SC16C752BIB48,157 are marked as obsolete and should not be selected for new product designs. These parts are available only for legacy system maintenance and repair. Active status parts (XR16M752IM48-F, SC16C752BIB48,128, TL16C752BLPTREP, TL16C752BTPTREP, TL16C752CIPFB, TL16C752CPFB) are recommended for all new applications.

Q: What supply voltage range should I verify when selecting a substitute? A: The original XR68M752IM48-F operates across 1.62V to 3.63V. NXP SC16C752 devices operate at discrete voltage levels (2.5V, 3.3V, 5V), while Texas Instruments TL16C752CIPFB and TL16C752CPFB support 1.62V to 5.5V. Verify that your circuit's supply voltage falls within the selected substitute's operating range. Narrower voltage ranges may require circuit redesign or voltage regulation modifications.

Q: Do all substitutes support RS232, RS422, and RS485 protocols? A: No. The original XR68M752IM48-F explicitly supports RS232, RS422, and RS485. NXP SC16C752 devices do not specify protocol support in the provided parameters. Texas Instruments TL16C752CIPFB and TL16C752CPFB specify RS485 support only. Verify protocol requirements for your application before selecting a substitute part.

Q: What is the significance of MSL (Moisture Sensitivity Level) ratings? A: MSL ratings indicate how long a component can be exposed to ambient moisture before soldering. The original XR68M752IM48-F has MSL 3 (168 hours), while NXP SC16C752 devices have MSL 1 (Unlimited), indicating superior moisture tolerance. Texas Instruments TL16C752BLPTREP and TL16C752BTPTREP have MSL 3 (168 hours), while TL16C752CIPFB and TL16C752CPFB have MSL 2 (1 Year). Select parts with MSL ratings appropriate for your storage and manufacturing environment.

Q: Can I use TL16C752CIPFB or TL16C752CPFB as direct pin-for-pin replacements? A: Yes, for PCB layout purposes. Both parts use 48-TQFP packaging matching the original XR68M752IM48-F footprint. However, verify that the 3Mbps maximum data rate and RS485-only protocol support meet your application requirements. Electrical characteristics and internal functionality may differ, requiring firmware or driver validation.

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