MAX3243CDB RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The MAX3243CDB is a full-duplex RS232 transceiver IC manufactured by Texas Instruments, designed for 3/5 driver/receiver configuration in 28-SSOP surface mount packaging. This component operates across 3V to 5.5V supply voltage range with a 250kbps data rate and 300mV receiver hysteresis, suitable for legacy serial communication applications.

The MAX3243CDB is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for systems utilizing this transceiver architecture.

Key Parameters

Parameter	Value
Part Number	MAX3243CDB
Manufacturer	Texas Instruments
Category	Interface - RS232 Transceiver
Type	Transceiver
Protocol	RS232
Drivers/Receivers	3/5
Duplex	Full
Data Rate	250kbps
Supply Voltage	3V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package	28-SSOP (0.209", 5.30mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)
Part Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the MAX3243CDB is determined by the following critical parameters:

Primary Compatibility Criteria:

Protocol: RS232
Drivers/Receivers Configuration: 3/5
Duplex Mode: Full
Package Type: 28-SSOP
Supply Voltage Range: 3V ~ 5.5V
Operating Temperature: 0°C ~ 70°C
Mounting Type: Surface Mount

Secondary Consideration Parameters:

Data Rate: 250kbps (minimum requirement)
Receiver Hysteresis: 300mV (minimum requirement)
RoHS Compliance: ROHS3 Compliant

Substitute parts are grouped into two categories based on data rate capability:

Category A - Direct Rate Match (250kbps): MAX3243CDBR, MAX3243ECAI+, MAX3243ECAI+T, MAX3244ECAI+, MAX3244ECAI+T

Category B - Enhanced Rate Capability (1Mbps): ICL3245CAZ, ICL3245CAZ-T, ICL3245ECAZ, ICL3245ECAZ-T, MAX3245ECAI+

All listed substitutes maintain identical package geometry, pin configuration, voltage specifications, and temperature operating range. Parts in Category B provide higher data rate performance while maintaining full backward compatibility with the MAX3243CDB electrical interface.

Parameter Comparison

Part Number	Manufacturer	Status	Drivers/Receivers	Data Rate	Receiver Hysteresis	Supply Voltage	Operating Temp	Package	Packaging Type	Inventory (Pcs)
MAX3243CDB	Texas Instruments	Obsolete	3/5	250kbps	300mV	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Tube	4550
MAX3243CDBR	Texas Instruments	Active	3/5	250kbps	300mV	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Cut Tape & Digi-Reel	185200
ICL3245CAZ	Renesas Electronics	Active	3/5	1Mbps	500mV	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Tube	1980
ICL3245CAZ-T	Renesas Electronics	Active	3/5	1Mbps	500mV	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Tape & Reel	1840
ICL3245ECAZ	Renesas Electronics	Active	3/5	1Mbps	500mV	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Tube	1864
ICL3245ECAZ-T	Renesas Electronics	Active	3/5	1Mbps	500mV	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Tape & Reel	2016
MAX3243ECAI+	Analog Devices/Maxim	Active	3/5	250kbps	500mV	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Tube	3284
MAX3243ECAI+T	Analog Devices/Maxim	Active	3/5	250kbps	500mV	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Cut Tape & Digi-Reel	1700
MAX3244ECAI+	Analog Devices/Maxim	Active	3/5	250kbps	500mV	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Tube	2200
MAX3244ECAI+T	Analog Devices/Maxim	Active	3/5	250kbps	500mV	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Tape & Reel	3580
MAX3245ECAI+	Analog Devices/Maxim	Active	3/5	1Mbps	500mV	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Tube	2310

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

MAX3243CDBR is the primary direct substitute, offering identical electrical specifications to the MAX3243CDB with active product status. This part maintains 250kbps data rate and 300mV receiver hysteresis. Availability is significantly higher (185,200 units) compared to the obsolete original. Packaging format is Cut Tape & Digi-Reel, suitable for automated assembly processes.

For Equivalent Performance with Enhanced Capability:

MAX3243ECAI+ and MAX3243ECAI+T (Analog Devices/Maxim) provide equivalent 250kbps operation with increased receiver hysteresis (500mV) and active product status. These parts are ROHS3 compliant with MSL rating of 1 (Unlimited). Packaging options include Tube and Cut Tape formats with combined inventory of 4,984 units.

MAX3244ECAI+ and MAX3244ECAI+T offer identical electrical performance to MAX3243ECAI+ variants with active status and higher combined inventory (5,780 units). These represent the MAX3244 base product line within the same transceiver family.

For Higher Data Rate Applications:

ICL3245 series (Renesas Electronics) and MAX3245ECAI+ (Analog Devices/Maxim) support 1Mbps data rate while maintaining all other electrical and mechanical compatibility parameters. These parts are suitable for applications requiring enhanced serial communication bandwidth. ICL3245 variants carry MSL rating of 2 (1 Year), while MAX3245ECAI+ maintains MSL rating of 1 (Unlimited).

All substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can MAX3243CDBR directly replace MAX3243CDB in existing designs?

A: Yes. MAX3243CDBR is electrically and mechanically identical to MAX3243CDB. Both operate at 250kbps with 300mV receiver hysteresis, 3V to 5.5V supply voltage, and 28-SSOP package. The primary difference is product status (Active vs. Obsolete) and packaging format (Cut Tape & Digi-Reel vs. Tube). Pin configuration and electrical interface are identical.

Q: What is the difference between 250kbps and 1Mbps data rate variants?

A: Data rate represents the maximum serial communication speed supported by the transceiver. The MAX3243CDB operates at 250kbps. ICL3245 series and MAX3245ECAI+ support 1Mbps, providing four times higher bandwidth. For applications operating at or below 250kbps, both categories are functionally equivalent. Higher data rate parts offer additional performance margin without compromising backward compatibility.

Q: Are there packaging format differences between substitutes?

A: Yes. Substitutes are available in three packaging formats: Tube, Cut Tape & Digi-Reel, and Tape & Reel. All use identical 28-SSOP package geometry (0.209", 5.30mm width). Tube packaging is suitable for manual assembly and lower-volume applications. Cut Tape & Digi-Reel and Tape & Reel formats are optimized for automated pick-and-place assembly. Selection depends on manufacturing process requirements, not electrical compatibility.

Q: What does receiver hysteresis specification mean for substitution?

A: Receiver hysteresis (300mV vs. 500mV) defines the voltage differential required for the receiver to switch logic states. The MAX3243CDB specifies 300mV. Substitutes with 500mV hysteresis provide greater noise immunity and are fully compatible. Higher hysteresis does not create incompatibility; it represents an enhanced specification that maintains signal integrity under noisier conditions.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification. The MAX3243CDB original part also meets ROHS3 requirements. All parts are REACH unaffected, confirming compliance with current environmental regulations.

Q: What is MSL rating and how does it affect part selection?

A: MSL (Moisture Sensitivity Level) indicates the component's sensitivity to moisture during storage and handling. MSL 1 (Unlimited) means the part has no moisture sensitivity restrictions. MSL 2 (1 Year) requires storage in controlled humidity conditions and has a one-year shelf life from manufacturing. For applications with standard storage conditions, MSL 1 parts (MAX3243CDBR, MAX3243ECAI+, MAX3244ECAI+, MAX3245ECAI+) are preferred. MSL 2 parts (ICL3245 series) require proper moisture control but are fully functional when handled according to specifications.

Q: Can I use higher inventory parts as substitutes?

A: Yes. Inventory levels do not affect electrical or mechanical compatibility. Parts with higher inventory (such as MAX3243CDBR with 185,200 units) offer better supply chain availability and shorter lead times. Selection should prioritize parts meeting electrical specifications and compliance requirements, with inventory availability as a secondary consideration for procurement planning.

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