MAX237CNG RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The MAX237CNG is a full-duplex RS232 transceiver manufactured by Analog Devices Inc./Maxim Integrated, configured with 5 drivers and 3 receivers in a 24-pin DIP package. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement continuity. The MAX237CNG operates within the 4.5V to 5.5V supply range and supports data rates up to 120 kbps with a receiver hysteresis of 500 mV.

Key Parameters

Parameter	MAX237CNG
Manufacturer	Analog Devices Inc./Maxim Integrated
Type	Transceiver
Protocol	RS232
Drivers/Receivers	5/3
Duplex	Full
Package	24-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Voltage Supply	4.5V ~ 5.5V
Data Rate	120 kbps
Receiver Hysteresis	500 mV
Operating Temperature	0°C ~ 70°C
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts for the MAX237CNG are classified based on the following critical parameters that determine functional compatibility:

Driver/Receiver Configuration: The MAX237CNG requires a 5/3 driver/receiver configuration. Substitutes must maintain this exact configuration to ensure pin-compatible operation and signal routing integrity.

Package and Pinout: All substitutes must use the 24-DIP (0.300", 7.62mm) package with identical Through Hole mounting to ensure mechanical and electrical compatibility with existing PCB layouts.

Protocol and Duplex Mode: Full-duplex RS232 operation is mandatory for all substitutes.

Electrical Operating Range: Supply voltage (4.5V ~ 5.5V) and data rate (120 kbps) define the baseline electrical requirements.

Receiver Hysteresis and Data Rate: These parameters establish the signal integrity and communication speed specifications.

Substitutes are organized into two categories:

Parametric Equivalents: Parts with identical or superior electrical specifications and active product status, enabling direct replacement.

Manufacturer Recommended Substitutes: Parts with enhanced specifications (higher data rates, extended temperature ranges, improved receiver hysteresis) that provide superior performance while maintaining functional compatibility.

Parameter Comparison

Part Number	Manufacturer	Drivers/Receivers	Package	Voltage Supply	Data Rate	Receiver Hysteresis	Operating Temperature	Product Status	RoHS Status
MAX237CNG	Analog Devices/Maxim	5/3	24-DIP	4.5V ~ 5.5V	120 kbps	500 mV	0°C ~ 70°C	Obsolete	RoHS non-compliant
MAX237CNG+	Analog Devices/Maxim	5/3	24-DIP	4.5V ~ 5.5V	120 kbps	500 mV	0°C ~ 70°C	Active	ROHS3 Compliant
MAX206CNG+	Analog Devices/Maxim	4/3	24-DIP	4.5V ~ 5.5V	120 kbps	500 mV	0°C ~ 70°C	Obsolete	ROHS3 Compliant
MAX236CNG+	Analog Devices/Maxim	4/3	24-DIP	4.5V ~ 5.5V	120 kbps	500 mV	0°C ~ 70°C	Active	ROHS3 Compliant
ADM237LANZ	Analog Devices	5/3	24-DIP	4.75V ~ 5.25V	120 kbps	650 mV	-40°C ~ 85°C	Active	ROHS3 Compliant
ADM237LJNZ	Analog Devices	5/3	24-DIP	4.75V ~ 5.25V	120 kbps	650 mV	0°C ~ 70°C	Active	ROHS3 Compliant
ADM207EANZ	Analog Devices	5/3	24-DIP	4.5V ~ 5.5V	230 kbps	650 mV	-40°C ~ 85°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Identical Configuration)

MAX237CNG+ is the primary substitute for MAX237CNG. Both parts maintain identical driver/receiver configuration (5/3), package format (24-DIP), electrical specifications (4.5V ~ 5.5V, 120 kbps, 500 mV hysteresis), and operating temperature range (0°C ~ 70°C). MAX237CNG+ is active in production and ROHS3 compliant, addressing the obsolescence and compliance limitations of the original part.

Functional Equivalents with Enhanced Specifications

ADM237LANZ and ADM237LJNZ maintain the 5/3 driver/receiver configuration and 24-DIP package required for direct substitution. Both parts are active and ROHS3 compliant. ADM237LANZ extends the operating temperature range to -40°C ~ 85°C and narrows the supply voltage window to 4.75V ~ 5.25V. ADM237LJNZ maintains the original 0°C ~ 70°C temperature range while narrowing the supply voltage specification. Both increase receiver hysteresis to 650 mV.

ADM207EANZ provides the highest performance option within the 5/3 configuration. It doubles the data rate to 230 kbps, extends operating temperature to -40°C ~ 85°C, and maintains the original 4.5V ~ 5.5V supply range. Receiver hysteresis is increased to 650 mV. This part is suitable for applications requiring higher communication speeds.

Reduced Configuration Alternatives

MAX206CNG+ and MAX236CNG+ feature a 4/3 driver/receiver configuration, reducing the number of available drivers from 5 to 4. These parts are suitable only for applications that do not require all five driver channels. MAX236CNG+ is active in production and ROHS3 compliant, while MAX206CNG+ is obsolete but ROHS3 compliant.

Frequently Asked Questions (FAQ)

Q: Can MAX237CNG+ be used as a direct replacement for MAX237CNG?

A: Yes. MAX237CNG+ maintains identical electrical specifications, driver/receiver configuration (5/3), package format (24-DIP), and operating temperature range (0°C ~ 70°C). The primary differences are active product status and ROHS3 compliance.

Q: What is the key difference between MAX237CNG and ADM237LANZ?

A: Both parts maintain the 5/3 driver/receiver configuration and 24-DIP package. ADM237LANZ extends the operating temperature range to -40°C ~ 85°C and narrows the supply voltage specification to 4.75V ~ 5.25V. Receiver hysteresis increases from 500 mV to 650 mV. Selection depends on whether the application requires the extended temperature range and can operate within the narrower voltage window.

Q: Can MAX206CNG+ or MAX236CNG+ replace MAX237CNG?

A: These parts feature a 4/3 driver/receiver configuration instead of 5/3. They are suitable only if the application requires no more than four driver channels. Pinout differences may require PCB layout modifications.

Q: Why does ADM207EANZ have a higher data rate than MAX237CNG?

A: ADM207EANZ is specified for 230 kbps operation compared to 120 kbps for MAX237CNG. This enhanced specification does not prevent its use in applications designed for 120 kbps operation. The higher data rate capability provides design flexibility for future upgrades.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed are ROHS3 compliant. The original MAX237CNG is RoHS non-compliant. This compliance difference is significant for applications subject to environmental regulations.

Q: What is the impact of increased receiver hysteresis in ADM237 and ADM207 parts?

A: Receiver hysteresis increases from 500 mV (MAX237CNG) to 650 mV (ADM237LANZ, ADM237LJNZ, ADM207EANZ). Higher hysteresis improves noise immunity but may reduce sensitivity to weak input signals. Selection depends on signal integrity requirements in the specific application.

Q: Can ADM237LANZ be used in applications with supply voltages below 4.75V?

A: No. ADM237LANZ specifies a minimum supply voltage of 4.75V, compared to 4.5V for MAX237CNG. Applications requiring operation at 4.5V ~ 4.74V must use MAX237CNG+, MAX206CNG+, MAX236CNG+, or ADM207EANZ.

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