SN75C3243PW RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The SN75C3243PW is a full-duplex RS232 transceiver manufactured by Texas Instruments, featuring 3 drivers and 5 receivers in a 28-TSSOP surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The device operates across 3V to 5.5V supply voltage with a 1Mbps data rate and 500mV receiver hysteresis, suitable for legacy RS232 communication applications requiring full-duplex operation.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	SN75C3243PW
Product Status	Obsolete
Type	Transceiver
Protocol	RS232
Drivers/Receivers	3/5
Duplex	Full
Data Rate	1Mbps
Receiver Hysteresis	500 mV
Supply Voltage	3V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package	28-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the SN75C3243PW is determined by the following critical parameters:

Primary Compatibility Criteria:

RS232 protocol compliance
3/5 driver/receiver configuration
Full-duplex operation
28-TSSOP package footprint
3V to 5.5V supply voltage range
Surface mount technology

Secondary Compatibility Criteria:

Data rate capability (minimum 1Mbps for direct substitution)
Receiver hysteresis (500mV preferred for direct substitution)
Operating temperature range (0°C to 70°C minimum)
RoHS3 compliance
MSL rating of 1 or better

Parts are grouped into three categories: direct substitutes (matching all primary and secondary criteria), functional equivalents (matching primary criteria with minor parameter variations), and upgrades (enhanced specifications with extended temperature range or higher data rates).

Parameter Comparison

Part Number	Manufacturer	Status	Data Rate	Hysteresis	Temp Range	Package	Inventory
SN75C3243PW	Texas Instruments	Obsolete	1Mbps	500 mV	0°C ~ 70°C	28-TSSOP	2160 Pcs
SN75C3243PWR	Texas Instruments	Active	1Mbps	500 mV	0°C ~ 70°C	28-TSSOP	2303 Pcs
MAX3243ECUI+	Analog Devices Inc./Maxim	Active	120Kbps	300 mV	0°C ~ 70°C	28-TSSOP	2100 Pcs
MAX3243ECUI+T	Analog Devices Inc./Maxim	Active	120Kbps	300 mV	0°C ~ 70°C	28-TSSOP	3700 Pcs
MAX3244ECUI+	Analog Devices Inc./Maxim	Active	250kbps	500 mV	0°C ~ 70°C	28-TSSOP	924 Pcs
SP3243EBEY-L	MaxLinear, Inc.	Active	250kbps	300 mV	-40°C ~ 85°C	28-TSSOP	1200 Pcs
SP3243EUCY-L/TR	MaxLinear, Inc.	Active	1Mbps	300 mV	0°C ~ 70°C	28-TSSOP	2120 Pcs
MAX3245EEUI+	Analog Devices Inc./Maxim	Active	1Mbps	500 mV	-40°C ~ 85°C	28-TSSOP	2200 Pcs
MAX3245EEUI+T	Analog Devices Inc./Maxim	Active	1Mbps	500 mV	-40°C ~ 85°C	28-TSSOP	4680 Pcs
SP3243EUEY-L/TR	MaxLinear, Inc.	Active	1Mbps	300 mV	-40°C ~ 85°C	28-TSSOP	4659 Pcs
ICL3243ECAZ	Renesas Electronics	Active	250kbps	500 mV	0°C ~ 70°C	28-SSOP	2716 Pcs

Engineering Selection Recommendations

Direct Substitutes (Recommended First Choice):

SN75C3243PWR is the primary direct substitute, offering identical electrical specifications and operating parameters to the obsolete SN75C3243PW. Both devices are Texas Instruments products with matching 1Mbps data rate, 500mV receiver hysteresis, and 0°C to 70°C operating range. The PWR variant is active in production with higher inventory availability (2303 Pcs vs. 2160 Pcs). Both maintain ROHS3 compliance and MSL rating of 1.

Functional Equivalents (Same Temperature Range):

SP3243EUCY-L/TR (MaxLinear) and MAX3244ECUI+ (Analog Devices) provide functional equivalence within the 0°C to 70°C operating window. SP3243EUCY-L/TR matches the 1Mbps data rate specification with 300mV hysteresis and Tape & Reel packaging. MAX3244ECUI+ delivers 250kbps data rate with 500mV hysteresis in Tube packaging. Both are active products with ROHS3 compliance.

Enhanced Specifications (Extended Temperature Range):

MAX3245EEUI+, MAX3245EEUI+T, SP3243EUEY-L/TR, and SP3243EBEY-L offer extended operating temperature ranges (-40°C to 85°C) compared to the original specification. MAX3245EEUI+ and MAX3245EEUI+T maintain 1Mbps data rate with 500mV hysteresis. SP3243EUEY-L/TR and SP3243EBEY-L provide 1Mbps and 250kbps data rates respectively with 300mV hysteresis. These upgrades are suitable for applications requiring wider temperature operation.

Package Consideration:

ICL3243ECAZ (Renesas) uses 28-SSOP packaging (0.209", 5.30mm width) instead of 28-TSSOP (0.173", 4.40mm width). This package difference requires PCB layout verification before selection. The device maintains 500mV hysteresis and 0°C to 70°C operating range with 250kbps data rate capability.

Compliance & Availability:

All recommended substitutes maintain ROHS3 compliance and MSL rating of 1 (unlimited moisture sensitivity). Inventory levels range from 924 to 4680 pieces, with MAX3245EEUI+T and SP3243EUEY-L/TR offering the highest stock availability.

Frequently Asked Questions (FAQ)

Q: Can I use MAX3243ECUI+ as a direct replacement for SN75C3243PW?

A: MAX3243ECUI+ is functionally compatible but with parameter differences. The data rate is reduced to 120Kbps (vs. 1Mbps) and receiver hysteresis is 300mV (vs. 500mV). It maintains the same 3V to 5.5V supply voltage, 3/5 driver/receiver configuration, and 28-TSSOP package. Selection depends on whether your application requires the full 1Mbps data rate and 500mV hysteresis specifications.

Q: What is the difference between SN75C3243PW and SN75C3243PWR?

A: SN75C3243PWR is the active production variant of the obsolete SN75C3243PW. Both are Texas Instruments products with identical electrical specifications: 1Mbps data rate, 500mV receiver hysteresis, 3V to 5.5V supply, and 0°C to 70°C operating range. The PWR variant uses Digi-Reel packaging and is currently in active production with higher inventory availability.

Q: Can I use SP3243EUCY-L/TR in place of SN75C3243PW?

A: SP3243EUCY-L/TR is compatible for applications within the 0°C to 70°C temperature range. It matches the 1Mbps data rate and maintains the 3/5 driver/receiver configuration in 28-TSSOP package. The receiver hysteresis is 300mV instead of 500mV. This difference may affect noise immunity in electrically noisy environments. Verify your application's hysteresis requirements before selection.

Q: Why would I choose an upgrade part like MAX3245EEUI+?

A: MAX3245EEUI+ offers extended operating temperature range (-40°C to 85°C) while maintaining 1Mbps data rate and 500mV receiver hysteresis. Select this upgrade if your application requires operation beyond the standard 0°C to 70°C range or if you need enhanced thermal performance. The 28-TSSOP package remains identical.

Q: Is ICL3243ECAZ a suitable substitute despite the different package?

A: ICL3243ECAZ uses 28-SSOP packaging (5.30mm width) instead of 28-TSSOP (4.40mm width). While electrically compatible with 500mV hysteresis and 0°C to 70°C operation, the larger package footprint requires PCB layout redesign. This substitute is only viable if your design allows package modification. Verify pinout compatibility and PCB routing before implementation.

Q: What does MSL rating 1 mean for component handling?

A: MSL (Moisture Sensitivity Level) rating of 1 indicates unlimited floor life. The component can be stored at room temperature and humidity without time restrictions before soldering. This is the most favorable rating for inventory management and reduces risk of moisture-induced defects during assembly.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts maintain RoHS3 compliance, matching the original SN75C3243PW specification. This ensures compatibility with environmental regulations and procurement requirements for RoHS3-mandated applications.

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