MAX3238IDB RS232 Transceiver Interface IC Equivalent & Substitute Parts

Part Overview

The MAX3238IDB is a full-duplex RS232 transceiver interface IC manufactured by Texas Instruments, configured with 5 drivers and 3 receivers in a 28-SSOP surface mount package. This component operates across a 3V to 5.5V supply voltage range and supports data rates up to 250 kbps with an operating temperature range of -40°C to 85°C. The MAX3238IDB is classified as obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for legacy systems utilizing this interface transceiver architecture.

Key Parameters

Parameter	Value
Manufacturer Part Number	MAX3238IDB
Manufacturer	Texas Instruments
Product Status	Obsolete
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	5/3
Duplex	Full
Receiver Hysteresis	300 mV
Data Rate	250 kbps
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 compatibility for the MAX3238IDB is determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Parameters:

Protocol: RS232
Number of Drivers/Receivers: 5/3 configuration
Duplex: Full
Data Rate: 250 kbps maximum
Voltage Supply Range: 3V ~ 5.5V
Mounting Type: Surface Mount
Package / Case: 28-SSOP (0.209", 5.30mm Width)

Secondary Compatibility Factors:

Receiver Hysteresis: 300 mV (primary part specification)
Operating Temperature Range: -40°C ~ 85°C (primary part specification)
RoHS Compliance: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Substitute parts are grouped into two categories based on operational temperature range alignment:

Category A - Extended Temperature Range (-40°C ~ 85°C): Parts maintaining the full extended temperature specification of the original MAX3238IDB, suitable for applications requiring operation across the complete temperature envelope.

Category B - Commercial Temperature Range (0°C ~ 70°C): Parts with reduced operating temperature range, applicable to commercial-grade applications with narrower thermal requirements.

All substitute parts maintain the 28-SSOP package footprint, full-duplex RS232 protocol, 5/3 driver/receiver configuration, and 250 kbps data rate specification.

Parameter Comparison

Part Number	Manufacturer	Product Status	Receiver Hysteresis	Operating Temperature	Packaging	RoHS Status	MSL
MAX3238IDB	Texas Instruments	Obsolete	300 mV	-40°C ~ 85°C	-	ROHS3 Compliant	1 (Unlimited)
MAX3238EEAI+	Analog Devices Inc./Maxim Integrated	Active	600 mV	-40°C ~ 85°C	Tube	ROHS3 Compliant	1 (Unlimited)
MAX3238EEAI+T	Analog Devices Inc./Maxim Integrated	Active	600 mV	-40°C ~ 85°C	Cut Tape (CT) & Digi-Reel®	ROHS3 Compliant	1 (Unlimited)
ICL3238EIAZ	Renesas Electronics Corporation	Active	600 mV	-40°C ~ 85°C	Tube	ROHS3 Compliant	3 (168 Hours)
ICL3238EIAZ-T	Renesas Electronics Corporation	Active	600 mV	-40°C ~ 85°C	-	ROHS3 Compliant	3 (168 Hours)
MAX3238CAI+	Analog Devices Inc./Maxim Integrated	Active	500 mV	0°C ~ 70°C	Tube	ROHS3 Compliant	1 (Unlimited)
MAX3238CAI+T	Analog Devices Inc./Maxim Integrated	Active	500 mV	0°C ~ 70°C	Tape & Reel (TR)	ROHS3 Compliant	1 (Unlimited)
MAX3238EAI+T	Analog Devices Inc./Maxim Integrated	Active	300 mV	-40°C ~ 85°C	-	ROHS3 Compliant	1 (Unlimited)
MAX3238ECAI+	Analog Devices Inc./Maxim Integrated	Active	600 mV	0°C ~ 70°C	Tube	ROHS3 Compliant	1 (Unlimited)
MAX3238ECAI+T	Analog Devices Inc./Maxim Integrated	Active	600 mV	0°C ~ 70°C	Cut Tape (CT) & Digi-Reel®	ROHS3 Compliant	1 (Unlimited)
SP3238ECA-L/TR	MaxLinear, Inc.	Active	500 mV	0°C ~ 70°C	-	RoHS Compliant	2 (1 Year)
ICL3238EIAZ	Renesas Electronics Corporation	Active	600 mV	-40°C ~ 85°C	Tube	ROHS3 Compliant	3 (168 Hours)

Engineering Selection Recommendations

For Extended Temperature Applications (-40°C ~ 85°C):

Select from MAX3238EEAI+, MAX3238EEAI+T, ICL3238EIAZ, ICL3238EIAZ-T, or MAX3238EAI+T. These parts maintain the full extended temperature operating range of the original MAX3238IDB. All candidates are active product status with ROHS3 compliance. MAX3238EAI+T provides identical receiver hysteresis specification (300 mV) to the original part. MAX3238EEAI+ and MAX3238EEAI+T offer active product status with established supply availability. ICL3238EIAZ and ICL3238EIAZ-T from Renesas Electronics provide alternative sourcing with extended temperature support.

For Commercial Temperature Applications (0°C ~ 70°C):

Select from MAX3238CAI+, MAX3238CAI+T, MAX3238ECAI+, MAX3238ECAI+T, or SP3238ECA-L/TR. These parts operate within the 0°C to 70°C commercial temperature range. All maintain active product status and ROHS3 compliance except SP3238ECA-L/TR which carries RoHS Compliant status. MAX3238CAI+ and MAX3238CAI+T provide 500 mV receiver hysteresis with high inventory availability. MAX3238ECAI+ and MAX3238ECAI+T offer 600 mV receiver hysteresis specification.

Packaging Considerations:

Tube packaging is suitable for manual assembly and lower-volume production. Cut Tape (CT) & Digi-Reel® and Tape & Reel (TR) packaging support automated pick-and-place assembly processes. Select packaging based on production methodology and assembly equipment compatibility.

Compliance and Certification:

All substitute parts maintain ROHS3 compliance or equivalent RoHS Compliant status. Moisture Sensitivity Level varies between MSL 1 (Unlimited), MSL 2 (1 Year), and MSL 3 (168 Hours). MSL 1 parts require no special moisture control during storage and handling. MSL 3 parts require controlled humidity storage and have limited shelf life after packaging opening.

Frequently Asked Questions (FAQ)

Q: Can MAX3238CAI+ or MAX3238CAI+T be used as direct replacements for MAX3238IDB in applications requiring -40°C operation?

A: No. MAX3238CAI+ and MAX3238CAI+T operate within 0°C ~ 70°C temperature range only. Applications requiring -40°C minimum operating temperature must use parts specified for -40°C ~ 85°C range: MAX3238EEAI+, MAX3238EEAI+T, ICL3238EIAZ, ICL3238EIAZ-T, or MAX3238EAI+T.

Q: What is the significance of receiver hysteresis differences between substitute parts?

A: Receiver hysteresis affects noise immunity and signal threshold characteristics. The original MAX3238IDB specifies 300 mV hysteresis. MAX3238EAI+T maintains this specification. Parts with 500 mV or 600 mV hysteresis provide increased noise immunity but may affect signal detection thresholds in noise-sensitive applications. Verify receiver hysteresis compatibility with application signal characteristics.

Q: Are all substitute parts pin-compatible with MAX3238IDB?

A: All substitute parts maintain the 28-SSOP package footprint with identical pin configuration. Pin compatibility is assured across all listed substitutes. PCB layout modifications are not required for package-level substitution.

Q: What packaging format should be selected for high-volume automated assembly?

A: Cut Tape (CT) & Digi-Reel® and Tape & Reel (TR) packaging formats support automated pick-and-place assembly equipment. Tube packaging is suitable for manual assembly or lower-volume production. Select packaging based on production volume and assembly process requirements.

Q: How does Moisture Sensitivity Level (MSL) affect component handling and storage?

A: MSL 1 (Unlimited) parts require no special moisture control and have unlimited shelf life. MSL 2 (1 Year) parts require controlled humidity storage with one-year shelf life after packaging opening. MSL 3 (168 Hours) parts require controlled humidity storage with 168-hour shelf life after packaging opening. Verify MSL compatibility with storage and handling procedures.

Q: Can substitute parts from different manufacturers be mixed in the same production batch?

A: All substitute parts maintain identical electrical specifications for protocol, driver/receiver configuration, data rate, and supply voltage. Parts from Analog Devices Inc./Maxim Integrated, Renesas Electronics Corporation, and MaxLinear, Inc. are functionally equivalent within specified parameter ranges. Mixing manufacturers is permissible provided temperature range and receiver hysteresis specifications match application requirements.

Q: What is the product status significance for component selection?

A: Active product status indicates ongoing manufacturer support, continued production, and established supply chain availability. The original MAX3238IDB is classified as obsolete, indicating discontinued production. All listed substitute parts carry active product status, ensuring long-term availability and supply continuity for new designs and production requirements.

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