SP3243EBCR-L/TR Equivalent & Substitute Parts

Part Overview

The SP3243EBCR-L/TR is a 3/5 full-duplex RS232 transceiver manufactured by MaxLinear, Inc., housed in a 32-QFN (5x5) package with exposed pad. This interface IC operates across 3V to 5.5V supply voltage and supports data rates up to 250 kbps with 300 mV receiver hysteresis. The part is currently classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	SP3243EBCR-L/TR
Manufacturer	MaxLinear, Inc.
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	3/5
Duplex	Full
Package / Case	32-VFQFN Exposed Pad
Data Rate	250 kbps
Voltage - Supply	3V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Receiver Hysteresis	300 mV
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	2 (1 Year)

Substitute Part Grouping Explanation

Substitution eligibility for the SP3243EBCR-L/TR is determined by the following critical parameters:

Protocol and Channel Configuration: RS232 protocol with 3/5 driver/receiver configuration and full-duplex operation
Package Compatibility: 32-QFN (5x5) with exposed pad for direct pin-compatible replacement
Electrical Specifications: Supply voltage range 3V to 5.5V, data rate capability of 250 kbps or higher, receiver hysteresis tolerance
Operating Temperature Range: 0°C to 70°C minimum
Product Status: Active or available alternatives to obsolete classification

Substitute parts are grouped into two categories:

Category 1 - Package-Compatible Substitutes (32-QFN): Parts maintaining identical 32-QFN (5x5) package footprint, enabling direct PCB replacement without layout modification.

Category 2 - Functional Equivalents (Alternative Packages): Parts with identical electrical specifications and RS232 3/5 configuration but in different surface-mount packages (28-SSOP, 28-SOIC, 28-TSSOP), requiring PCB redesign but offering active product status and improved availability.

Parameter Comparison

Part Number	Manufacturer	Package	Protocol	Drivers/Receivers	Data Rate	Supply Voltage	Operating Temp	Receiver Hysteresis	Product Status	RoHS Status
SP3243EBCR-L/TR	MaxLinear, Inc.	32-QFN (5x5)	RS232	3/5	250 kbps	3V ~ 5.5V	0°C ~ 70°C	300 mV	Obsolete	Not specified
SP3243EBCA-L/TR	MaxLinear, Inc.	28-SSOP	RS232	3/5	250 kbps	3V ~ 5.5V	0°C ~ 70°C	300 mV	Active	RoHS Compliant
ISL3243EIRZ	Renesas Electronics Corporation	32-QFN (5x5)	RS232	3/5	250 kbps	2.7V ~ 3.6V	-40°C ~ 85°C	500 mV	Active	ROHS3 Compliant
ISL3243EIRZ-T	Renesas Electronics Corporation	32-QFN (5x5)	RS232	3/5	250 kbps	2.7V ~ 3.6V	-40°C ~ 85°C	500 mV	Active	ROHS3 Compliant
MAX3243CDBR	Texas Instruments	28-SSOP	RS232	3/5	250 kbps	3V ~ 5.5V	0°C ~ 70°C	300 mV	Active	ROHS3 Compliant
MAX3243CDW	Texas Instruments	28-SOIC	RS232	3/5	250 kbps	3V ~ 5.5V	0°C ~ 70°C	300 mV	Obsolete	ROHS3 Compliant
MAX3243CDWR	Texas Instruments	28-SOIC	RS232	3/5	250 kbps	3V ~ 5.5V	0°C ~ 70°C	300 mV	Active	ROHS3 Compliant
MAX3243CPW	Texas Instruments	28-TSSOP	RS232	3/5	250 kbps	3V ~ 5.5V	0°C ~ 70°C	500 mV	Obsolete	ROHS3 Compliant
MAX3243CPWR	Texas Instruments	28-TSSOP	RS232	3/5	250 kbps	3V ~ 5.5V	0°C ~ 70°C	500 mV	Active	ROHS3 Compliant
MAX3243ECPW	Texas Instruments	28-TSSOP	RS232	3/5	500 kbps	3V ~ 5.5V	0°C ~ 70°C	500 mV	Obsolete	ROHS3 Compliant
MAX3243ECPWR	Texas Instruments	28-TSSOP	RS232	3/5	500 kbps	3V ~ 5.5V	0°C ~ 70°C	500 mV	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Package Replacement (32-QFN Footprint)

ISL3243EIRZ and ISL3243EIRZ-T (Renesas Electronics Corporation) provide pin-compatible 32-QFN (5x5) substitutes with active product status. Both parts maintain RS232 3/5 full-duplex configuration and 250 kbps data rate. Key considerations include narrower supply voltage range (2.7V to 3.6V versus 3V to 5.5V) and extended operating temperature range (-40°C to 85°C). Receiver hysteresis is specified at 500 mV compared to 300 mV in the original part. ISL3243EIRZ-T offers tape and reel packaging with higher inventory availability (7400 units) and ROHS3 compliance with REACH unaffected status.

For Functional Equivalence with Package Flexibility

SP3243EBCA-L/TR (MaxLinear, Inc.) maintains identical electrical specifications (3V to 5.5V, 0°C to 70°C, 300 mV hysteresis, 250 kbps) in 28-SSOP package with active product status and RoHS compliance. This option preserves the original manufacturer lineage while offering improved availability (2052 units).

MAX3243CDBR (Texas Instruments) provides 28-SSOP packaging with matching electrical parameters (3V to 5.5V, 0°C to 70°C, 300 mV hysteresis, 250 kbps), active product status, ROHS3 compliance, and highest inventory availability (185200 units).

MAX3243CDWR (Texas Instruments) offers 28-SOIC package with identical electrical specifications and active product status, suitable for applications where SOIC footprint is acceptable.

MAX3243CPWR (Texas Instruments) provides 28-TSSOP package with 500 mV receiver hysteresis and 250 kbps data rate, active product status, and substantial inventory (45100 units).

MAX3243ECPWR (Texas Instruments) extends data rate capability to 500 kbps in 28-TSSOP package with 500 mV hysteresis, active product status, and 27600 units available.

All Texas Instruments alternatives carry ROHS3 compliance and REACH unaffected status.

Frequently Asked Questions (FAQ)

Q: Can ISL3243EIRZ directly replace SP3243EBCR-L/TR without PCB modification?

A: Yes. ISL3243EIRZ maintains identical 32-QFN (5x5) package footprint and pin configuration, enabling direct PCB replacement. However, the narrower supply voltage range (2.7V to 3.6V) requires verification that your power supply design operates within this specification. The extended operating temperature range (-40°C to 85°C) and 500 mV receiver hysteresis are compatible with RS232 applications designed for the original part.

Q: What is the primary difference between ISL3243EIRZ and ISL3243EIRZ-T?

A: Both parts are electrically identical. The difference is packaging format: ISL3243EIRZ ships in tube packaging, while ISL3243EIRZ-T is supplied in tape and reel format. ISL3243EIRZ-T offers higher inventory availability (7400 units) and is preferred for production volume requirements.

Q: If I redesign my PCB, which substitute offers the best availability?

A: MAX3243CDBR (Texas Instruments, 28-SSOP package) provides the highest inventory availability at 185200 units with active product status, ROHS3 compliance, and identical electrical specifications to the original part (3V to 5.5V, 0°C to 70°C, 300 mV hysteresis, 250 kbps).

Q: Are there supply voltage compatibility concerns with Renesas ISL3243 parts?

A: Yes. ISL3243EIRZ and ISL3243EIRZ-T operate within 2.7V to 3.6V supply range, which is narrower than the original SP3243EBCR-L/TR specification (3V to 5.5V). If your application requires 5V operation, Renesas parts are not suitable. Texas Instruments MAX3243 variants maintain the full 3V to 5.5V range.

Q: What is the significance of receiver hysteresis differences?

A: The original SP3243EBCR-L/TR specifies 300 mV receiver hysteresis. ISL3243 parts specify 500 mV, while most MAX3243 variants specify either 300 mV or 500 mV depending on the specific model. Higher hysteresis provides greater noise immunity but may affect signal transition timing. Verify your application's noise environment and timing requirements before selecting parts with different hysteresis specifications.

Q: Which substitute offers the highest data rate capability?

A: MAX3243ECPW and MAX3243ECPWR (Texas Instruments, 28-TSSOP package) support 500 kbps data rate compared to 250 kbps in the original part. MAX3243ECPWR is the active product variant with 27600 units available. This higher data rate capability provides design margin for future applications.

Q: Are all substitute parts RoHS compliant?

A: SP3243EBCA-L/TR is RoHS Compliant. All Texas Instruments MAX3243 variants are ROHS3 Compliant. ISL3243EIRZ and ISL3243EIRZ-T are ROHS3 Compliant with REACH unaffected status. The original SP3243EBCR-L/TR does not specify RoHS status.

Q: What packaging options are available for RS232 3/5 transceiver substitutes?

A: Four package options are available: 32-QFN (5x5) for direct footprint replacement, 28-SSOP for space-constrained designs, 28-SOIC for standard DIP-equivalent spacing, and 28-TSSOP for ultra-compact applications. Package selection depends on PCB layout constraints and manufacturing capabilities.

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