SN65C3243DBR RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The SN65C3243DBR is an active RS232 transceiver interface IC manufactured by Texas Instruments, configured as a 3/5 full-duplex transceiver in a 28-SSOP surface mount package. The device operates across 3V to 5.5V supply voltage with a 1Mbps data rate and is classified as Active product status with ROHS3 compliance. Substitute parts are identified when equivalent electrical specifications, mechanical packaging, and operational parameters align with the primary device, enabling direct replacement in circuit designs without functional degradation.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN65C3243DBR
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	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	28-SSOP (0.209", 5.30mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SN65C3243DBR is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

Protocol: RS232
Number of Drivers/Receivers: 3/5
Duplex: Full
Voltage Supply Range: 3V ~ 5.5V
Operating Temperature Range: -40°C ~ 85°C
Package / Case: 28-SSOP (0.209", 5.30mm Width)
Mounting Type: Surface Mount
Product Status: Active

Secondary Compatibility Factors:

Receiver Hysteresis: 500 mV (preferred match)
Data Rate: 1Mbps (preferred match)
RoHS Compliance: ROHS3 Compliant

Parts meeting all primary criteria are classified as direct substitutes. Parts with identical electrical specifications and packaging are preferred. Parts with reduced data rate (250kbps) or different receiver hysteresis (300 mV) remain functionally compatible within the 28-SSOP package constraint but represent performance variations.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Protocol	Drivers/Receivers	Data Rate	Receiver Hysteresis	Voltage Supply	Operating Temp	Package	RoHS Status	MSL
SN65C3243DBR	Texas Instruments	RS232	3/5	1Mbps	500 mV	3V ~ 5.5V	-40°C ~ 85°C	28-SSOP	ROHS3	1
ICL3245EIAZ	Renesas Electronics	RS232	3/5	1Mbps	500 mV	3V ~ 5.5V	-40°C ~ 85°C	28-SSOP	ROHS3	2
MAX3243EEAI+	Analog Devices/Maxim	RS232	3/5	250kbps	500 mV	3V ~ 5.5V	-40°C ~ 85°C	28-SSOP	ROHS3	1
MAX3243EEAI+T	Analog Devices/Maxim	RS232	3/5	250kbps	500 mV	3V ~ 5.5V	-40°C ~ 85°C	28-SSOP	ROHS3	1
MAX3244EEAI+	Analog Devices/Maxim	RS232	3/5	250kbps	500 mV	3V ~ 5.5V	-40°C ~ 85°C	28-SSOP	ROHS3	1
MAX3245EEAI+	Analog Devices/Maxim	RS232	3/5	1Mbps	500 mV	3V ~ 5.5V	-40°C ~ 85°C	28-SSOP	ROHS3	1
SP3243EUEA-L/TR	MaxLinear, Inc.	RS232	3/5	1Mbps	300 mV	3V ~ 5.5V	-40°C ~ 85°C	28-SSOP	RoHS Compliant	2
ICL3243ECAZ	Renesas Electronics	RS232	3/5	250kbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	ROHS3	2
ICL3243ECAZ-T	Renesas Electronics	RS232	3/5	250kbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	ROHS3	2
ICL3243ECVZ	Renesas Electronics	RS232	3/5	250kbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	28-TSSOP	ROHS3	3
ICL3243ECVZ-T	Renesas Electronics	RS232	3/5	250kbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	28-TSSOP	ROHS3	3

Engineering Selection Recommendations

Tier 1 - Full Electrical and Mechanical Equivalence: ICL3245EIAZ and MAX3245EEAI+ maintain complete parameter alignment with the SN65C3243DBR across all critical specifications including 1Mbps data rate, 500 mV receiver hysteresis, -40°C to 85°C operating range, and 28-SSOP packaging. Both devices carry Active product status and ROHS3 compliance. ICL3245EIAZ is manufactured by Renesas Electronics with MSL 2 rating. MAX3245EEAI+ is manufactured by Analog Devices/Maxim Integrated with MSL 1 rating matching the primary device.

Tier 2 - Functional Equivalence with Reduced Data Rate: MAX3243EEAI+, MAX3243EEAI+T, and MAX3244EEAI+ operate at 250kbps data rate versus the 1Mbps specification of the SN65C3243DBR. All three maintain identical 3/5 driver/receiver configuration, 500 mV receiver hysteresis, 3V to 5.5V supply voltage, -40°C to 85°C operating temperature, and 28-SSOP packaging. These devices are suitable for applications where communication bandwidth does not require 1Mbps throughput. All carry ROHS3 compliance and MSL 1 rating.

Tier 3 - Mechanical Package Variation: SP3243EUEA-L/TR operates at 1Mbps matching the primary device data rate but features 300 mV receiver hysteresis instead of 500 mV. The device maintains 3/5 configuration, 3V to 5.5V supply, -40°C to 85°C operating temperature, and 28-SSOP packaging. Manufactured by MaxLinear with RoHS compliance and MSL 2 rating. The reduced hysteresis specification may affect noise immunity in certain electromagnetic environments.

Tier 4 - Restricted Operating Temperature Range: ICL3243ECAZ, ICL3243ECAZ-T, ICL3243ECVZ, and ICL3243ECVZ-T are restricted to 0°C to 70°C operating temperature versus the -40°C to 85°C range of the primary device. These Renesas Electronics parts operate at 250kbps data rate. ICL3243ECVZ and ICL3243ECVZ-T use 28-TSSOP packaging (0.173", 4.40mm width) instead of 28-SSOP, requiring PCB layout modification. These parts are suitable only for applications within the narrower temperature specification.

Frequently Asked Questions (FAQ)

Q: Can MAX3243EEAI+ directly replace SN65C3243DBR in all applications? A: MAX3243EEAI+ is mechanically and electrically compatible within the 28-SSOP package. The primary difference is reduced data rate (250kbps versus 1Mbps). Direct replacement is valid for applications operating below 250kbps communication speed. Applications requiring 1Mbps throughput should use ICL3245EIAZ or MAX3245EEAI+ instead.

Q: What is the significance of receiver hysteresis differences between SP3243EUEA-L/TR (300 mV) and SN65C3243DBR (500 mV)? A: Receiver hysteresis determines the voltage differential required to switch logic states at the input. The 500 mV specification of the primary device provides greater noise immunity than the 300 mV specification of SP3243EUEA-L/TR. In electrically noisy environments, the higher hysteresis value reduces false triggering. SP3243EUEA-L/TR remains functionally compatible but may require additional input filtering in high-noise applications.

Q: Are ICL3243ECAZ and ICL3243ECAZ-T suitable replacements for extended temperature applications? A: No. Both parts are restricted to 0°C to 70°C operating temperature, which does not cover the -40°C to 85°C range of the SN65C3243DBR. These parts are suitable only for applications operating within the narrower temperature specification. For full temperature range coverage, use ICL3245EIAZ, MAX3245EEAI+, or SP3243EUEA-L/TR.

Q: What packaging differences exist between 28-SSOP and 28-TSSOP variants? A: 28-SSOP measures 0.209" (5.30mm) width, while 28-TSSOP measures 0.173" (4.40mm) width. The TSSOP variant is physically smaller and requires different PCB footprint design. ICL3243ECVZ and ICL3243ECVZ-T use 28-TSSOP packaging and cannot be directly substituted without PCB layout modification. Use 28-SSOP variants (ICL3243ECAZ, ICL3243ECAZ-T) for direct socket compatibility.

Q: How do MSL (Moisture Sensitivity Level) ratings affect component handling? A: MSL 1 (Unlimited) indicates no moisture sensitivity restrictions. MSL 2 (1 Year) requires storage in dry conditions and limits shelf life to one year after opening. MSL 3 (168 Hours) requires baking before reflow soldering. SN65C3243DBR carries MSL 1. Substitutes with higher MSL ratings (ICL3245EIAZ at MSL 2, ICL3243ECVZ at MSL 3) require stricter handling and storage protocols.

Q: Which substitute offers the closest electrical match to SN65C3243DBR? A: ICL3245EIAZ and MAX3245EEAI+ provide complete electrical specification alignment including 1Mbps data rate, 500 mV receiver hysteresis, -40°C to 85°C operating range, and 28-SSOP packaging. Both are Active status products with ROHS3 compliance. ICL3245EIAZ is the manufacturer-recommended alternative from Renesas Electronics.

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