SP3243ECT-L Equivalent & Substitute Parts

Part Overview

The SP3243ECT-L is a full-duplex RS232 transceiver IC manufactured by MaxLinear, Inc., featuring 3 drivers and 5 receivers in a 28-SOIC package. This component operates across 3V to 5.5V supply voltage with a 120 kbps data rate and 300 mV receiver hysteresis. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring RS232 interface functionality.

Key Parameters

Parameter	SP3243ECT-L
Manufacturer	MaxLinear, Inc.
Type	Transceiver
Protocol	RS232
Drivers/Receivers	3/5
Duplex	Full
Package	28-SOIC (0.295", 7.50mm Width)
Voltage Supply	3V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Data Rate	120 kbps
Receiver Hysteresis	300 mV
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the SP3243ECT-L is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Protocol: RS232
Drivers/Receivers: 3/5 configuration
Duplex: Full
Package Type: 28-SOIC (0.295", 7.50mm Width)
Voltage Supply Range: 3V ~ 5.5V
Mounting Type: Surface Mount

Acceptable Variation Parameters:

Data Rate: Substitute parts may exceed 120 kbps (higher data rates are backward compatible)
Receiver Hysteresis: Substitute parts may differ from 300 mV (500 mV acceptable)
Operating Temperature: Substitute parts may exceed 0°C ~ 70°C range (wider ranges acceptable)
Moisture Sensitivity Level: May vary based on packaging and storage requirements
Product Status: Active or Last Time Buy parts are acceptable replacements for obsolete parts

Substitute parts are grouped into two categories: Texas Instruments TRS3243 series (direct electrical equivalents with enhanced specifications) and Renesas ICL3243 series (functional equivalents with comparable performance characteristics).

Parameter Comparison

Part Number	Manufacturer	Drivers/Receivers	Package	Voltage Supply	Data Rate	Receiver Hysteresis	Operating Temp	Product Status
SP3243ECT-L	MaxLinear, Inc.	3/5	28-SOIC	3V ~ 5.5V	120 kbps	300 mV	0°C ~ 70°C	Obsolete
MAX3243EIDW	Texas Instruments	3/5	28-SOIC	3V ~ 5.5V	500 kbps	500 mV	-40°C ~ 85°C	Last Time Buy
TRS3243EIDW	Texas Instruments	3/5	28-SOIC	3V ~ 5.5V	500 kbps	500 mV	-40°C ~ 85°C	Last Time Buy
TRS3243EIDWR	Texas Instruments	3/5	28-SOIC	3V ~ 5.5V	500 kbps	500 mV	-40°C ~ 85°C	Active
TRS3243IDWR	Texas Instruments	3/5	28-SOIC	3V ~ 5.5V	250 kbps	500 mV	-40°C ~ 85°C	Discontinued at DiGi Electronics
ICL3243CBZ	Renesas Electronics	3/5	28-SOIC	3V ~ 5.5V	250 kbps	300 mV	0°C ~ 70°C	Active
ICL3243CBZ-T	Renesas Electronics	3/5	28-SOIC	3V ~ 5.5V	250 kbps	300 mV	0°C ~ 70°C	Active
MAX3243CDBR	Texas Instruments	3/5	28-SSOP	3V ~ 5.5V	250 kbps	300 mV	0°C ~ 70°C	Active
MAX3243CDW	Texas Instruments	3/5	28-SOIC	3V ~ 5.5V	250 kbps	300 mV	0°C ~ 70°C	Obsolete
MAX3243CDWR	Texas Instruments	3/5	28-SOIC	3V ~ 5.5V	250 kbps	300 mV	0°C ~ 70°C	Active
MAX3243CPW	Texas Instruments	3/5	28-TSSOP	3V ~ 5.5V	250 kbps	500 mV	0°C ~ 70°C	Obsolete

Engineering Selection Recommendations

Primary Substitutes (28-SOIC Package, Active Status):

TRS3243EIDWR is the recommended primary substitute. This part maintains the 28-SOIC package footprint, operates within the required 3V to 5.5V supply range, and is currently active in production. The enhanced data rate (500 kbps) and extended operating temperature range (-40°C to 85°C) provide superior performance margins. ROHS3 compliance and unlimited moisture sensitivity level support modern manufacturing and storage requirements.

Secondary Substitutes (28-SOIC Package, Active Status):

MAX3243CDWR provides functional equivalence with identical electrical characteristics to the original SP3243ECT-L (300 mV receiver hysteresis, 250 kbps data rate, 0°C to 70°C operating range). This part is currently active and available in Tape & Reel packaging. The 28-SOIC package ensures direct PCB compatibility without layout modifications.

ICL3243CBZ and ICL3243CBZ-T (Renesas Electronics) offer active production status with matching receiver hysteresis (300 mV) and operating temperature range. These parts are available in both Tube and Tape & Reel packaging options, providing supply chain flexibility.

Package Variant (28-SSOP):

MAX3243CDBR is available in 28-SSOP package (0.209", 5.30mm Width) for applications where reduced board space is required. This part maintains electrical compatibility but requires PCB layout modification due to different package dimensions.

Frequently Asked Questions (FAQ)

Q: Can TRS3243EIDWR directly replace SP3243ECT-L without PCB modifications?

A: Yes. Both parts use the 28-SOIC package with identical pin spacing (0.295", 7.50mm Width) and pinout configuration. No PCB layout changes are required. The higher data rate (500 kbps vs. 120 kbps) and extended temperature range are backward compatible with existing designs.

Q: What is the difference between TRS3243EIDWR and MAX3243CDWR?

A: Both are 28-SOIC packages with 3/5 driver/receiver configuration and 3V to 5.5V supply voltage. TRS3243EIDWR offers 500 kbps data rate and -40°C to 85°C operating range. MAX3243CDWR provides 250 kbps data rate and 0°C to 70°C operating range. Select based on system performance requirements and environmental operating conditions.

Q: Why is MAX3243CDBR listed as a substitute if it uses 28-SSOP package?

A: MAX3243CDBR maintains electrical equivalence (3/5 configuration, RS232 protocol, 3V to 5.5V supply) but requires PCB redesign due to different package dimensions (28-SSOP vs. 28-SOIC). This option is suitable for new designs or systems undergoing layout revision.

Q: Are all substitute parts ROHS3 compliant?

A: All active and Last Time Buy substitute parts listed carry ROHS3 compliance certification. Obsolete parts (MAX3243CDW, MAX3243CPW) also maintain ROHS3 compliance. Verify specific compliance requirements for your application and supply chain.

Q: What packaging options are available for the recommended substitute TRS3243EIDWR?

A: TRS3243EIDWR is supplied in Tape & Reel (TR) packaging. Alternative packaging formats are available through related part numbers: TRS3243EIDW (Tube packaging) and TRS3243IDWR (discontinued at DiGi Electronics).

Q: Can I use MAX3243CPW as a substitute despite the different package (28-TSSOP)?

A: MAX3243CPW is electrically compatible but uses 28-TSSOP package (0.173", 4.40mm Width), requiring PCB layout modification. This part is obsolete; active alternatives in 28-SOIC or 28-SSOP packages are preferred for new designs.

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