MAX203EPP RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The MAX203EPP is a 2/2 full-duplex RS232 transceiver manufactured by Analog Devices Inc./Maxim Integrated, housed in a 20-pin DIP package. This interface IC is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations. The MAX203EPP operates within a 4.75V to 5.25V supply range with a 120 kbps data rate and 500 mV receiver hysteresis, suitable for legacy RS232 communication applications requiring full-duplex operation.

Key Parameters

Parameter	Value
Manufacturer Part Number	MAX203EPP
Manufacturer	Analog Devices Inc./Maxim Integrated
Category	Interface
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	2/2
Duplex	Full
Receiver Hysteresis	500 mV
Data Rate	120 kbps
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	20-DIP (0.300", 7.62mm)
Supplier Device Package	20-PDIP
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the MAX203EPP are classified into three categories based on substitution criteria:

Parametric Equivalents (MAX203 Series): MAX203EEPP+G36, MAX203EPP+G36 maintain identical electrical specifications including 500 mV receiver hysteresis, 120 kbps data rate, -40°C to 85°C operating temperature range, and 20-PDIP packaging. These parts differ only in product status (Active vs. Obsolete) and RoHS compliance (ROHS3 Compliant vs. non-compliant), making them direct functional replacements.

Parametric Equivalents (MAX233 Series): MAX233AEPP+G36 and MAX233EPP+G36 share identical electrical and thermal specifications with the MAX203EPP, including receiver hysteresis, data rate, supply voltage, operating temperature, and package configuration. The MAX233 base product number indicates a different device variant within the same functional class, with Active product status and ROHS3 compliance.

Direct Manufacturer Substitute (ADM233 Series): ADM233LANZ and ADM233LJNZ are Analog Devices direct substitutes with the same 2/2 full-duplex RS232 transceiver functionality and 20-PDIP package. These parts feature 650 mV receiver hysteresis (compared to 500 mV in the MAX203EPP) and differ in operating temperature range. ADM233LJNZ operates at 0°C to 70°C, while ADM233LANZ operates at -40°C to 85°C.

Key Parameters Determining Substitution:

Protocol: RS232
Number of Drivers/Receivers: 2/2
Duplex: Full
Data Rate: 120 kbps
Supply Voltage: 4.75V ~ 5.25V
Package / Case: 20-DIP (0.300", 7.62mm)
Mounting Type: Through Hole

Parameter Comparison

Part Number	Manufacturer	Product Status	Receiver Hysteresis	Operating Temperature	RoHS Status	Inventory (Pcs)
MAX203EPP	Analog Devices Inc./Maxim Integrated	Obsolete	500 mV	-40°C ~ 85°C	RoHS non-compliant	4270
MAX203EEPP+G36	Analog Devices Inc./Maxim Integrated	Active	500 mV	-40°C ~ 85°C	ROHS3 Compliant	2100
MAX203EPP+G36	Analog Devices Inc./Maxim Integrated	Active	500 mV	-40°C ~ 85°C	ROHS3 Compliant	924
MAX233AEPP+G36	Analog Devices Inc./Maxim Integrated	Active	500 mV	-40°C ~ 85°C	ROHS3 Compliant	917
MAX233EPP+G36	Analog Devices Inc./Maxim Integrated	Active	500 mV	-40°C ~ 85°C	ROHS3 Compliant	1302
ADM233LANZ	Analog Devices Inc.	Active	650 mV	-40°C ~ 85°C	ROHS3 Compliant	1330
ADM233LJNZ	Analog Devices Inc.	Active	650 mV	0°C ~ 70°C	ROHS3 Compliant	7572

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): MAX203EEPP+G36 and MAX203EPP+G36 provide the most direct substitution path, maintaining all electrical parameters and thermal operating range of the original MAX203EPP. Both parts carry Active product status and ROHS3 compliance, addressing obsolescence and regulatory requirements.

For MAX233 Series Selection: MAX233AEPP+G36 and MAX233EPP+G36 are functionally equivalent alternatives with identical receiver hysteresis and operating temperature specifications. These parts are suitable for applications where the MAX233 base product number is acceptable within system design constraints.

For ADM233 Series Selection: ADM233LANZ maintains the full -40°C to 85°C operating temperature range with 650 mV receiver hysteresis. ADM233LJNZ is restricted to 0°C to 70°C operation and is suitable only for applications within this narrower temperature range. The increased receiver hysteresis (650 mV vs. 500 mV) may affect noise immunity characteristics in marginal signal environments.

Compliance Considerations: All substitute parts listed carry ROHS3 compliance and Active product status, eliminating obsolescence risk and meeting modern regulatory requirements. The original MAX203EPP is RoHS non-compliant and obsolete, making transition to any listed substitute necessary for long-term supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can MAX203EEPP+G36 or MAX203EPP+G36 be used as direct drop-in replacements for MAX203EPP?

A: Yes. Both parts maintain identical electrical specifications, thermal operating range (-40°C to 85°C), receiver hysteresis (500 mV), data rate (120 kbps), and 20-PDIP package configuration. The primary differences are product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What is the functional difference between MAX203 and MAX233 series transceivers?

A: Both series provide 2/2 full-duplex RS232 transceiver functionality with identical electrical parameters and packaging. The MAX233 represents a different product variant within Analog Devices' RS232 transceiver portfolio. Selection between series depends on design documentation and system requirements.

Q: Why do ADM233LANZ and ADM233LJNZ have 650 mV receiver hysteresis instead of 500 mV?

A: The ADM233 series is a distinct product line from Analog Devices with different internal design specifications. The 650 mV hysteresis is a characteristic of this device family and does not prevent functional substitution in standard RS232 applications, though it may affect performance in systems with marginal signal levels.

Q: Is ADM233LJNZ suitable for applications requiring -40°C to 85°C operation?

A: No. ADM233LJNZ operates only within 0°C to 70°C. For full temperature range compatibility with the original MAX203EPP, use ADM233LANZ, which maintains -40°C to 85°C operation.

Q: Are all substitute parts available in the same 20-PDIP package?

A: Yes. All listed substitute parts use the 20-DIP (0.300", 7.62mm) through-hole package, ensuring mechanical and electrical compatibility with existing PCB designs.

Q: What is the significance of the "+G36" suffix in part numbers?

A: The "+G36" suffix indicates packaging specification and traceability coding applied by the manufacturer. It does not affect electrical functionality or substitution compatibility.

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