SN75C3243DWR Equivalent & Substitute Parts

Part Overview

The SN75C3243DWR is a 3/5 Transceiver Full RS232 interface IC manufactured by Texas Instruments in 28-SOIC packaging. This component operates across 3V to 5.5V supply voltage with a 1Mbps data rate and 500 mV receiver hysteresis. The part is currently in Last Time Buy status, making identification of functionally equivalent alternatives essential for design continuity and long-term supply chain planning.

Key Parameters

Parameter	SN75C3243DWR
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	3/5
Duplex	Full
Receiver Hysteresis	500 mV
Data Rate	1Mbps
Voltage - Supply	3V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package / Case	28-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL	1 (Unlimited)
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitution of the SN75C3243DWR is determined by the following critical parameters:

Primary Compatibility Criteria:

Protocol: RS232
Number of Drivers/Receivers: 3/5
Duplex: Full
Package / Case: 28-SOIC (0.295", 7.50mm Width)
Voltage - Supply: 3V ~ 5.5V
Receiver Hysteresis: 500 mV
Data Rate: 1Mbps

Substitute parts are grouped into two categories based on these parameters:

Category A - Direct Pin-Compatible Substitutes (Identical Electrical and Mechanical Specifications): Parts that maintain all critical parameters including receiver hysteresis (500 mV), data rate (1Mbps), operating temperature range (0°C ~ 70°C), and 28-SOIC package format.

Category B - Functional Equivalents with Parameter Variations: Parts that maintain RS232 protocol, 3/5 driver/receiver configuration, and 28-SOIC package but differ in receiver hysteresis (300 mV), data rate (250kbps), or operating temperature range. These parts are electrically compatible but operate within different performance specifications.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Receiver Hysteresis	Data Rate	Voltage Supply	Operating Temp	Package	Product Status
SN75C3243DWR	Texas Instruments	RS232	3/5	500 mV	1Mbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	Last Time Buy
TRSF3243EIPWR	Texas Instruments	RS232	3/5	500 mV	1Mbps	3V ~ 3.6V, 4.5V ~ 5.5V	-40°C ~ 85°C	28-TSSOP	Active
MAX3245ECWI+	Analog Devices Inc./Maxim Integrated	RS232	3/5	500 mV	1Mbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	Active
MAX3245EEWI+T	Analog Devices Inc./Maxim Integrated	RS232	3/5	500 mV	1Mbps	3V ~ 5.5V	-40°C ~ 85°C	28-SOIC	Active
ICL3243CBZ	Renesas Electronics Corporation	RS232	3/5	300 mV	250kbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	Active
ICL3243CBZ-T	Renesas Electronics Corporation	RS232	3/5	300 mV	250kbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	Active
MAX3243ECWI+	Analog Devices Inc./Maxim Integrated	RS232	3/5	300 mV	250kbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	Active
MAX3243EEWI+	Analog Devices Inc./Maxim Integrated	RS232	3/5	500 mV	250kbps	3V ~ 5.5V	-40°C ~ 85°C	28-SOIC	Active
MAX3243EEWI+T	Analog Devices Inc./Maxim Integrated	RS232	3/5	500 mV	250kbps	3V ~ 5.5V	-40°C ~ 85°C	28-SOIC	Active
MAX3244ECWI+	Analog Devices Inc./Maxim Integrated	RS232	3/5	500 mV	250kbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	Active
MAX3244EEWI+	Analog Devices Inc./Maxim Integrated	RS232	3/5	500 mV	250kbps	3V ~ 5.5V	-40°C ~ 85°C	28-SOIC	Active

Engineering Selection Recommendations

Direct Substitutes (Identical Specifications):

MAX3245ECWI+ and MAX3245EEWI+T are direct functional equivalents to the SN75C3243DWR. Both maintain 500 mV receiver hysteresis, 1Mbps data rate, 3V to 5.5V supply voltage, and 28-SOIC packaging. MAX3245ECWI+ operates within the same 0°C to 70°C temperature range as the original part. MAX3245EEWI+T extends the operating temperature to -40°C to 85°C, providing enhanced thermal performance for extended-range applications. Both parts are manufactured by Analog Devices Inc./Maxim Integrated and carry Active product status with ROHS3 compliance.

Alternative Substitutes with Performance Variations:

ICL3243CBZ and ICL3243CBZ-T (Renesas Electronics Corporation) maintain the 28-SOIC package and 3V to 5.5V supply voltage but operate at reduced receiver hysteresis (300 mV) and data rate (250kbps). These parts are suitable for applications where lower data rates are acceptable and the reduced hysteresis specification does not impact system performance.

MAX3243ECWI+, MAX3243EEWI+, and MAX3243EEWI+T (Analog Devices Inc./Maxim Integrated) similarly operate at 250kbps data rate with 300 mV hysteresis (except MAX3243EEWI+ and MAX3243EEWI+T which maintain 500 mV hysteresis). MAX3244ECWI+ and MAX3244EEWI+ also operate at 250kbps with 500 mV hysteresis and provide extended temperature ranges in the EEWI+ variant.

TRSF3243EIPWR (Texas Instruments) maintains the 500 mV hysteresis and 1Mbps data rate but uses 28-TSSOP packaging instead of 28-SOIC, requiring PCB layout modifications. This part is Active status and extends operating temperature to -40°C to 85°C.

All substitute parts carry ROHS3 compliance and REACH Unaffected status, matching the regulatory profile of the original component.

Frequently Asked Questions (FAQ)

Q: Can MAX3245ECWI+ directly replace SN75C3243DWR without circuit modifications?

A: Yes. MAX3245ECWI+ maintains identical electrical specifications (500 mV receiver hysteresis, 1Mbps data rate, 3V to 5.5V supply) and 28-SOIC packaging. Pin-to-pin compatibility and functional equivalence are confirmed across all critical parameters.

Q: What is the difference between MAX3245ECWI+ and MAX3245EEWI+T?

A: Both parts are electrically identical with 500 mV hysteresis and 1Mbps data rate. The primary difference is operating temperature range: MAX3245ECWI+ operates 0°C to 70°C, while MAX3245EEWI+T extends to -40°C to 85°C. Selection depends on thermal environment requirements.

Q: Why do ICL3243CBZ and MAX3243ECWI+ have lower data rates (250kbps vs. 1Mbps)?

A: These parts are designed for lower-speed RS232 applications. The 250kbps specification is a design characteristic of these devices. Applications requiring 1Mbps operation must use parts explicitly rated for that speed: SN75C3243DWR, TRSF3243EIPWR, MAX3245ECWI+, or MAX3245EEWI+T.

Q: Is TRSF3243EIPWR a suitable replacement if I need extended temperature range?

A: TRSF3243EIPWR provides extended temperature operation (-40°C to 85°C) and maintains 500 mV hysteresis and 1Mbps data rate. However, it uses 28-TSSOP packaging instead of 28-SOIC, requiring PCB redesign. MAX3245EEWI+T offers extended temperature range while maintaining 28-SOIC packaging without layout modifications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance and REACH Unaffected status, matching the regulatory requirements of the original SN75C3243DWR component.

Q: What packaging options are available for RS232 3/5 transceivers in this family?

A: The primary package for this product category is 28-SOIC (0.295", 7.50mm Width). TRSF3243EIPWR is available in 28-TSSOP (0.173", 4.40mm Width) for space-constrained applications, though this requires PCB layout modifications.

Q: Can I use parts with 300 mV receiver hysteresis instead of 500 mV?

A: Receiver hysteresis affects noise immunity and signal detection thresholds. Parts with 300 mV hysteresis (ICL3243CBZ, MAX3243ECWI+) are suitable only if your application design accommodates the reduced hysteresis specification. For direct functional replacement, use parts with 500 mV hysteresis.

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