SP3243EBCR-L RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The SP3243EBCR-L is a full-duplex RS232 transceiver with 3 drivers and 5 receivers, manufactured by MaxLinear, Inc. in a 32-QFN (5x5) surface mount package. This part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and production requirements. Substitute parts must maintain compatibility across electrical specifications, package form factor, and operational parameters to ensure direct replacement capability.

Key Parameters

Parameter	SP3243EBCR-L
Manufacturer	MaxLinear, Inc.
Type	Transceiver
Protocol	RS232
Drivers/Receivers	3/5
Duplex	Full
Package	32-VFQFN Exposed Pad (5x5)
Data Rate	250 kbps
Supply Voltage	3V to 5.5V
Operating Temperature	0°C to 70°C
Receiver Hysteresis	300 mV
Mounting Type	Surface Mount
RoHS Status	RoHS Compliant
MSL Rating	2 (1 Year)
Product Status	Discontinued

Substitute Part Grouping Explanation

Substitution logic for the SP3243EBCR-L is based on the following critical parameters:

Package Compatibility: The 32-VFQFN Exposed Pad (5x5) package is the primary constraint. Only parts in identical or pin-compatible packages qualify as direct substitutes.

Electrical Specifications: Supply voltage range (3V to 5.5V), data rate capability (250 kbps minimum), receiver hysteresis (300 mV), and driver/receiver configuration (3/5) must be maintained or exceeded.

Operational Range: Operating temperature range (0°C to 70°C minimum) and duplex mode (full-duplex) must be supported.

Compliance: RoHS compliance status ensures regulatory alignment for new designs.

Substitute parts are grouped into two categories:

Category 1 - Package-Identical Substitutes (32-QFN): ISL3243EIRZ and ISL3243EIRZ-T maintain the 32-QFN package footprint. These parts offer extended temperature range (-40°C to 85°C) and higher receiver hysteresis (500 mV), with supply voltage range of 2.7V to 3.6V. The narrower voltage range requires design verification for 5V-only applications.

Category 2 - Package-Different Substitutes (28-SSOP, 28-SOIC, 28-TSSOP): MAX3243 series parts in alternative packages (28-SSOP, 28-SOIC, 28-TSSOP) provide functional equivalence but require PCB layout redesign. These parts maintain 3/5 driver/receiver configuration and RS232 protocol compliance with identical or superior electrical performance.

Parameter Comparison

Parameter	SP3243EBCR-L	ISL3243EIRZ	ISL3243EIRZ-T	MAX3243CDBR	MAX3243CDW	MAX3243CDWR	MAX3243CPW	MAX3243CPWR	MAX3243ECPW	MAX3243ECPWR	MAX3243EIDB
Manufacturer	MaxLinear	Renesas	Renesas	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Package	32-VFQFN (5x5)	32-VFQFN (5x5)	32-VFQFN (5x5)	28-SSOP	28-SOIC	28-SOIC	28-TSSOP	28-TSSOP	28-TSSOP	28-TSSOP	28-SSOP
Drivers/Receivers	3/5	3/5	3/5	3/5	3/5	3/5	3/5	3/5	3/5	3/5	3/5
Data Rate	250 kbps	250 kbps	250 kbps	250 kbps	250 kbps	250 kbps	250 kbps	250 kbps	500 kbps	500 kbps	500 kbps
Supply Voltage	3V to 5.5V	2.7V to 3.6V	2.7V to 3.6V	3V to 5.5V	3V to 5.5V	3V to 5.5V	3V to 5.5V	3V to 5.5V	3V to 5.5V	3V to 5.5V	3V to 5.5V
Operating Temperature	0°C to 70°C	-40°C to 85°C	-40°C to 85°C	0°C to 70°C	0°C to 70°C	0°C to 70°C	0°C to 70°C	0°C to 70°C	0°C to 70°C	0°C to 70°C	-40°C to 85°C
Receiver Hysteresis	300 mV	500 mV	500 mV	300 mV	300 mV	300 mV	500 mV	500 mV	500 mV	500 mV	500 mV
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Discontinued	Active	Active	Active	Obsolete	Active	Obsolete	Active	Obsolete	Active	Obsolete

Engineering Selection Recommendations

For Direct Package Replacement (32-QFN):

ISL3243EIRZ and ISL3243EIRZ-T are the only package-identical alternatives. Both are manufactured by Renesas Electronics and maintain active product status. The ISL3243EIRZ-T variant in Tape & Reel packaging offers superior inventory availability (7400 pcs) compared to the tube-packaged ISL3243EIRZ (3530 pcs). Both parts provide extended temperature range (-40°C to 85°C) and ROHS3 compliance. The supply voltage range (2.7V to 3.6V) is narrower than the original part; designs operating at 5V require electrical compatibility assessment. Receiver hysteresis of 500 mV exceeds the original 300 mV specification, providing improved noise immunity.

For Alternative Package Solutions:

MAX3243CDBR (28-SSOP) and MAX3243CDWR (28-SOIC) maintain identical electrical specifications to the original part (3V to 5.5V supply, 0°C to 70°C operating range, 300 mV hysteresis, 250 kbps data rate). MAX3243CDBR offers the highest inventory availability (185,200 pcs) and active product status. MAX3243CDWR is obsolete but available in limited quantity (923 pcs).

MAX3243CPWR (28-TSSOP) and MAX3243ECPWR (28-TSSOP) provide enhanced data rate capability (500 kbps) with 500 mV receiver hysteresis. Both maintain 3V to 5.5V supply voltage and 0°C to 70°C operating range. MAX3243CPWR is active with 45,100 pcs inventory; MAX3243ECPWR is active with 27,600 pcs inventory.

MAX3243EIDB (28-SSOP) offers extended temperature range (-40°C to 85°C) with 500 kbps data rate capability but is obsolete with limited inventory (1900 pcs).

Compliance and Regulatory Status:

All substitute parts maintain ROHS3 compliance and EAR99 export classification, ensuring regulatory alignment with the original part. MSL ratings are equivalent or superior (MSL 1 for most MAX3243 variants versus MSL 2 for the original part).

Frequently Asked Questions (FAQ)

Q: Can ISL3243EIRZ be used as a direct replacement for SP3243EBCR-L in a 5V-only application?

A: The ISL3243EIRZ supply voltage range is 2.7V to 3.6V, which does not include 5V operation. Direct substitution in 5V-only designs is not supported. Designs with dual-supply capability (3.3V and 5V) or 3.3V-only operation may accommodate this part with electrical verification.

Q: What is the primary advantage of MAX3243ECPWR over MAX3243CDBR?

A: MAX3243ECPWR supports 500 kbps data rate compared to 250 kbps for MAX3243CDBR. Both maintain identical supply voltage (3V to 5.5V) and operating temperature (0°C to 70°C) ranges. MAX3243ECPWR is suitable for higher-speed RS232 applications. MAX3243CDBR offers superior inventory availability (185,200 pcs).

Q: Are package-different substitutes (28-SSOP, 28-SOIC, 28-TSSOP) suitable for direct PCB replacement?

A: No. Package-different substitutes require PCB layout redesign. The original 32-QFN (5x5) footprint is not compatible with 28-pin SSOP, SOIC, or TSSOP packages. These alternatives are suitable only for new PCB designs or redesign projects where layout modification is feasible.

Q: What is the significance of receiver hysteresis differences between substitute parts?

A: Receiver hysteresis affects noise immunity and signal integrity. The original SP3243EBCR-L specifies 300 mV hysteresis. Substitute parts with 500 mV hysteresis (ISL3243 series, MAX3243CPW/CPWR/ECPW/ECPWR/EIDB) provide improved noise rejection in electrically noisy environments. This is a performance enhancement and does not prevent substitution.

Q: Which substitute part offers the best long-term availability?

A: MAX3243CDBR (28-SSOP) is the recommended choice for long-term availability, with 185,200 pcs in stock and active product status. For package-identical substitution, ISL3243EIRZ-T (Tape & Reel) provides the highest inventory (7400 pcs) with active status.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, equivalent to or exceeding the RoHS compliance status of the original SP3243EBCR-L part.

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