MAX3237EEAI RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The MAX3237EEAI is a full-duplex RS232 transceiver manufactured by Analog Devices Inc./Maxim Integrated, configured with 5 drivers and 3 receivers in a 28-SSOP surface mount package. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design support and procurement.

The MAX3237EEAI operates across a 3V to 5.5V supply range with a 250 kbps data rate and supports operating temperatures from -40°C to 85°C. Its receiver hysteresis of 500 mV ensures reliable signal detection in noisy environments. The part is RoHS non-compliant and carries unlimited moisture sensitivity (MSL 1).

Key Parameters

Parameter	Value
Manufacturer Part Number	MAX3237EEAI
Manufacturer	Analog Devices Inc./Maxim Integrated
Category	Interface
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	5/3
Duplex	Full
Package / Case	28-SSOP (0.209", 5.30mm Width)
Mounting Type	Surface Mount
Voltage - Supply	3V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Data Rate	250 kbps
Receiver Hysteresis	500 mV
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MAX3237EEAI is determined by the following critical parameters:

Primary Substitution Criteria:

Protocol: RS232
Number of Drivers/Receivers: 5/3 configuration
Package / Case: 28-SSOP (0.209", 5.30mm Width)
Mounting Type: Surface Mount
Voltage - Supply: 3V ~ 5.5V
Receiver Hysteresis: 500 mV
Duplex: Full

Secondary Compatibility Factors:

Operating Temperature Range (must encompass or match -40°C ~ 85°C)
Data Rate (250 kbps minimum; higher rates are compatible)
RoHS Compliance Status (for regulatory requirements)
Moisture Sensitivity Level (MSL 1 or MSL 3 acceptable for equivalent function)

Substitute parts are grouped into three categories based on their relationship to the main part:

Parametric Equivalents - Identical electrical and mechanical specifications with different product status or packaging
Direct Manufacturer Equivalents - Same base functionality from alternative manufacturers with enhanced specifications
Manufacturer Recommended Equivalents - Factory-approved alternatives with minor parameter variations

Parameter Comparison

Part Number	Manufacturer	Drivers/Receivers	Data Rate	Operating Temp	Package	Product Status	RoHS Status	MSL
MAX3237EEAI	Analog Devices Inc./Maxim Integrated	5/3	250 kbps	-40°C ~ 85°C	28-SSOP	Obsolete	RoHS non-compliant	1
MAX3237EEAI+	Analog Devices Inc./Maxim Integrated	5/3	250 kbps	-40°C ~ 85°C	28-SSOP	Active	ROHS3 Compliant	1
MAX3250EAI+	Analog Devices Inc./Maxim Integrated	2/2	250 kbps	-40°C ~ 85°C	28-SSOP	Active	ROHS3 Compliant	1
MAX3237EIDBR	Texas Instruments	5/3	1 Mbps	-40°C ~ 85°C	28-SSOP	Active	ROHS3 Compliant	1
TRS3237EIDBR	Texas Instruments	5/3	1 Mbps	-40°C ~ 85°C	28-SSOP	Active	ROHS3 Compliant	1
ICL3237ECAZ	Renesas Electronics Corporation	5/3	1 Mbps	0°C ~ 70°C	28-SSOP	Active	ROHS3 Compliant	3
ICL3237ECAZ-T	Renesas Electronics Corporation	5/3	1 Mbps	0°C ~ 70°C	28-SSOP	Active	ROHS3 Compliant	3
ICL3237EIAZ	Renesas Electronics Corporation	5/3	1 Mbps	-40°C ~ 85°C	28-SSOP	Active	ROHS3 Compliant	3
ICL3237EIAZ-T	Renesas Electronics Corporation	5/3	1 Mbps	-40°C ~ 85°C	28-SSOP	Active	ROHS3 Compliant	3
MAX3237ECDBG4	Texas Instruments	5/3	1 Mbps	0°C ~ 70°C	28-SSOP	Discontinued at DiGi Electronics	ROHS3 Compliant	1
MAX3237ECDBR	Texas Instruments	5/3	1 Mbps	0°C ~ 70°C	28-SSOP	Active	ROHS3 Compliant	1

Engineering Selection Recommendations

Primary Recommendation: MAX3237EEAI+

The MAX3237EEAI+ is the direct parametric equivalent of the obsolete MAX3237EEAI. It maintains identical electrical specifications (5/3 drivers/receivers, 250 kbps data rate, -40°C to 85°C operating range) and mechanical compatibility (28-SSOP package). The primary advantage is active product status and ROHS3 compliance, making it suitable for new designs and regulatory requirements. This part is available in Tube packaging.

Secondary Recommendation for Extended Temperature Range: MAX3237EIDBR or TRS3237EIDBR

Both the MAX3237EIDBR (Texas Instruments) and TRS3237EIDBR (Texas Instruments) provide identical 5/3 driver/receiver configuration and maintain the full -40°C to 85°C operating temperature range. These parts offer enhanced data rate capability (1 Mbps versus 250 kbps) and ROHS3 compliance. Selection between these two depends on packaging preference and availability.

Alternative for Full Temperature Range: ICL3237EIAZ or ICL3237EIAZ-T

The ICL3237EIAZ and ICL3237EIAZ-T (Renesas Electronics Corporation) maintain the 5/3 configuration and -40°C to 85°C operating range with 1 Mbps data rate capability. These parts carry ROHS3 compliance and MSL 3 rating. The -T variant is supplied in Cut Tape & Digi-Reel packaging, while the standard variant uses Tube packaging.

Not Recommended: ICL3237ECAZ and ICL3237ECAZ-T

These Renesas parts restrict operating temperature to 0°C to 70°C, which does not encompass the full -40°C to 85°C range of the original MAX3237EEAI. Selection of these parts is appropriate only for applications with narrower temperature requirements.

Not Recommended: MAX3250EAI+

The MAX3250EAI+ features a 2/2 driver/receiver configuration, which differs from the required 5/3 specification. This part is suitable only for applications requiring fewer drivers and receivers.

Frequently Asked Questions (FAQ)

Q: Can MAX3237EEAI+ be used as a direct replacement for MAX3237EEAI?

A: Yes. The MAX3237EEAI+ is a parametric equivalent with identical electrical and mechanical specifications. The primary differences are active product status and ROHS3 compliance. Pin-for-pin compatibility and functional equivalence are confirmed.

Q: What is the difference between MAX3237EIDBR and TRS3237EIDBR?

A: Both parts are manufactured by Texas Instruments and provide identical electrical specifications (5/3 drivers/receivers, 1 Mbps data rate, -40°C to 85°C operating range, 28-SSOP package). The difference lies in the base product number designation (MAX3237 versus TRS3237). Both are active and ROHS3 compliant. Selection depends on supplier availability and internal part numbering systems.

Q: Why do some substitute parts have higher data rates (1 Mbps) than the original (250 kbps)?

A: Higher data rate capability is a performance enhancement that maintains backward compatibility. A 1 Mbps transceiver operates correctly at 250 kbps and lower speeds. This enhancement does not affect substitution validity for applications designed around the original 250 kbps specification.

Q: What is the significance of MSL (Moisture Sensitivity Level) differences?

A: MSL 1 (Unlimited) indicates no moisture sensitivity restrictions, while MSL 3 (168 Hours) requires controlled storage and handling. For applications with standard manufacturing environments, both levels are acceptable. MSL 3 parts require adherence to moisture control procedures during storage and assembly.

Q: Can ICL3237ECAZ be used in applications requiring -40°C operation?

A: No. The ICL3237ECAZ operating temperature range is 0°C to 70°C, which does not include -40°C. For applications requiring full -40°C to 85°C operation, use ICL3237EIAZ or ICL3237EIAZ-T instead.

Q: What packaging options are available for active substitutes?

A: MAX3237EEAI+ is supplied in Tube packaging. MAX3237EIDBR and TRS3237EIDBR are supplied in Cut Tape & Digi-Reel packaging. ICL3237EIAZ is supplied in Tube packaging, while ICL3237EIAZ-T is supplied in Cut Tape & Digi-Reel packaging. Selection depends on manufacturing volume and assembly requirements.

Q: Are all recommended substitutes ROHS3 compliant?

A: All active substitute parts listed are ROHS3 compliant. The original MAX3237EEAI is RoHS non-compliant. Compliance status is a key factor in selecting substitutes for new designs and regulatory adherence.

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