SN75C3243DW Equivalent & Substitute Parts

Part Overview

The SN75C3243DW is a full-duplex RS232 transceiver manufactured by Texas Instruments, featuring 3 drivers and 5 receivers in a 28-SOIC package. This device operates across 3V to 5.5V supply voltage with a 1Mbps data rate and is classified as Last Time Buy, indicating end-of-life status. Alternative equivalent parts are necessary to ensure continued design support, maintain supply chain flexibility, and access active product lines with extended availability.

Key Parameters

Parameter	SN75C3243DW
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS232
Drivers/Receivers	3/5
Duplex	Full
Data Rate	1Mbps
Voltage Supply	3V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package	28-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Receiver Hysteresis	500 mV
Product Status	Last Time Buy
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SN75C3243DW is determined by the following critical parameters:

Primary Compatibility Criteria:

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

Secondary Compatibility Criteria:

Data rate capability (minimum 1Mbps required)
Receiver hysteresis (500 mV nominal)
Operating temperature range (minimum 0°C to 70°C)
RoHS3 compliance
MSL rating compatibility

Substitute parts are grouped into two categories: direct pin-compatible replacements maintaining identical electrical and thermal specifications, and functional equivalents with extended operating ranges or alternative packaging that preserve core RS232 transceiver functionality.

Parameter Comparison

Part Number	Manufacturer	Drivers/Receivers	Data Rate	Voltage Supply	Operating Temp	Package	Receiver Hysteresis	Product Status	Inventory
SN75C3243DW	Texas Instruments	3/5	1Mbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	500 mV	Last Time Buy	1057 Pcs
TRSF3243EIPWR	Texas Instruments	3/5	1Mbps	3V ~ 3.6V, 4.5V ~ 5.5V	-40°C ~ 85°C	28-TSSOP	500 mV	Active	2923 Pcs
MAX3245ECWI+T	Analog Devices Inc./Maxim Integrated	3/5	1Mbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	500 mV	Active	1104 Pcs
MAX3245EEWI+	Analog Devices Inc./Maxim Integrated	3/5	1Mbps	3V ~ 5.5V	-40°C ~ 85°C	28-SOIC	500 mV	Active	979 Pcs
ICL3243CBZ	Renesas Electronics Corporation	3/5	250kbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	300 mV	Active	1060 Pcs
ICL3243CBZ-T	Renesas Electronics Corporation	3/5	250kbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	300 mV	Active	1586 Pcs
MAX3243ECWI+	Analog Devices Inc./Maxim Integrated	3/5	250kbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	300 mV	Active	2384 Pcs
MAX3243EEWI+	Analog Devices Inc./Maxim Integrated	3/5	250kbps	3V ~ 5.5V	-40°C ~ 85°C	28-SOIC	500 mV	Active	820 Pcs
MAX3243EEWI+T	Analog Devices Inc./Maxim Integrated	3/5	250kbps	3V ~ 5.5V	-40°C ~ 85°C	28-SOIC	500 mV	Active	2100 Pcs
MAX3244ECWI+	Analog Devices Inc./Maxim Integrated	3/5	250kbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	500 mV	Active	1024 Pcs
MAX3244EEWI+	Analog Devices Inc./Maxim Integrated	3/5	250kbps	3V ~ 5.5V	-40°C ~ 85°C	28-SOIC	500 mV	Active	1900 Pcs

Engineering Selection Recommendations

Direct Pin-Compatible Replacements (28-SOIC Package):

MAX3245ECWI+T and MAX3245EEWI+ maintain identical electrical specifications to the SN75C3243DW with matching 1Mbps data rate, 500 mV receiver hysteresis, and 28-SOIC package geometry. Both are manufactured by Analog Devices Inc./Maxim Integrated and carry Active product status with ROHS3 compliance. MAX3245EEWI+ provides extended operating temperature range (-40°C to 85°C) compared to the original 0°C to 70°C specification.

Alternative Package Option (28-TSSOP):

TRSF3243EIPWR from Texas Instruments offers equivalent electrical performance with 1Mbps data rate and 500 mV hysteresis in a 28-TSSOP package (0.173", 4.40mm width). This option provides extended temperature range (-40°C to 85°C) and Active product status. Selection requires PCB layout modification to accommodate the smaller TSSOP footprint.

Functional Equivalents with Reduced Data Rate:

ICL3243CBZ, ICL3243CBZ-T, MAX3243ECWI+, MAX3243EEWI+, MAX3243EEWI+T, MAX3244ECWI+, and MAX3244EEWI+ maintain 3/5 driver/receiver configuration and 28-SOIC package compatibility but operate at 250kbps data rate. These parts are suitable for applications where 1Mbps performance is not required. All carry Active product status and ROHS3 compliance. Extended temperature variants (EEWI+ and EEWI+T) support -40°C to 85°C operation.

Product Status Consideration:

All substitute parts listed carry Active product status, ensuring long-term availability and supply chain stability compared to the Last Time Buy status of the SN75C3243DW.

Frequently Asked Questions (FAQ)

Q: Can MAX3243ECWI+ directly replace SN75C3243DW in existing designs?

A: MAX3243ECWI+ maintains identical 28-SOIC package geometry, 3/5 driver/receiver configuration, and 3V to 5.5V supply voltage. However, it operates at 250kbps data rate versus the original 1Mbps specification. Direct substitution is valid only if application data rates do not exceed 250kbps.

Q: What is the difference between TRSF3243EIPWR and other substitutes?

A: TRSF3243EIPWR uses a 28-TSSOP package instead of 28-SOIC, requiring PCB layout changes. It maintains 1Mbps data rate and 500 mV hysteresis matching the original part. The smaller TSSOP footprint (4.40mm width versus 7.50mm) may provide space savings in compact designs.

Q: Are extended temperature variants suitable for standard industrial applications?

A: Extended temperature variants (MAX3245EEWI+, MAX3243EEWI+, MAX3243EEWI+T, MAX3244EEWI+) support -40°C to 85°C operation compared to the original 0°C to 70°C range. These are compatible with standard industrial applications and provide additional thermal margin for harsh environments.

Q: What packaging options are available for the substitute parts?

A: Substitute parts are available in Tube and Tape & Reel (TR) packaging. TRSF3243EIPWR is supplied in Tape & Reel format. MAX3245ECWI+T and ICL3243CBZ-T are Tape & Reel variants. Tube packaging is available for MAX3245EEWI+, ICL3243CBZ, MAX3243ECWI+, MAX3243EEWI+, MAX3243EEWI+T, MAX3244ECWI+, and MAX3244EEWI+.

Q: How do receiver hysteresis differences affect substitution?

A: The original SN75C3243DW specifies 500 mV receiver hysteresis. Substitutes with 300 mV hysteresis (ICL3243CBZ, ICL3243CBZ-T, MAX3243ECWI+) provide tighter input threshold margins. Selection depends on signal integrity requirements and noise immunity specifications in the application circuit.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed carry ROHS3 compliance certification, matching the original SN75C3243DW compliance status.

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