DS36C280M/NOPB Equivalent & Substitute Parts

Part Overview

The DS36C280M/NOPB is a 1/1 half-duplex RS422/RS485 transceiver IC manufactured by Texas Instruments in an 8-SOIC surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The device operates within a 4.75V to 5.25V supply voltage range and supports industrial communication protocols requiring half-duplex transceiver functionality.

Key Parameters

Parameter	DS36C280M/NOPB
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex	Half
Receiver Hysteresis	70 mV
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the DS36C280M/NOPB is determined by the following critical parameters:

Protocol compatibility: RS422/RS485 half-duplex transceiver
Package compatibility: 8-SOIC surface mount form factor
Electrical interface: 1/1 driver/receiver configuration
Supply voltage range: Must support 4.75V ~ 5.25V operation
Receiver hysteresis: Acceptable range for signal integrity in RS422/RS485 applications
Operating temperature: Must meet or exceed the original 0°C ~ 70°C range
Compliance: ROHS3 compliance and MSL rating

Substitute parts are grouped into two categories based on supply voltage compatibility:

Category A (3V ~ 3.6V Supply): MAX3430CSA+, MAX3430ESA+, MAX3430ESA+T — suitable for low-voltage applications but require voltage level translation if the original design operates at 5V.

Category B (4.75V ~ 5.25V Supply): MAX3440EASA+, MAX3440EASA+T, MAX3440EESA+, MAX3440EESA+T, MAX3442EASA+, MAX3442EASA+T, MAX3442EESA+ — direct voltage-compatible replacements for 5V systems.

Parameter Comparison

Parameter	DS36C280M/NOPB	MAX3430CSA+	MAX3430ESA+	MAX3430ESA+T	MAX3440EASA+	MAX3440EASA+T	MAX3440EESA+	MAX3440EESA+T	MAX3442EASA+	MAX3442EASA+T	MAX3442EESA+
Manufacturer	Texas Instruments	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Protocol	RS422, RS485	RS422, RS485	RS422, RS485	RS422, RS485	RS422, RS485	RS422, RS485	RS422, RS485	RS422, RS485	RS422, RS485	RS422, RS485	RS422, RS485
Number of Drivers/Receivers	1/1	1/1	1/1	1/1	1/1	1/1	1/1	1/1	1/1	1/1	1/1
Duplex	Half	Half	Half	Half	Half	Half	Half	Half	Half	Half	Half
Receiver Hysteresis	70 mV	25 mV	25 mV	25 mV	25 mV	25 mV	25 mV	25 mV	25 mV	25 mV	25 mV
Data Rate	—	250kbps	250kbps	250kbps	250kbps	250kbps	250kbps	250kbps	250kbps	250kbps	250kbps
Voltage - Supply	4.75V ~ 5.25V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All substitute parts listed are active products from Analog Devices Inc./Maxim Integrated and maintain ROHS3 compliance and MSL 1 rating, ensuring regulatory and environmental compatibility with the original DS36C280M/NOPB.

For 5V system designs, select from the 4.75V ~ 5.25V supply voltage group: MAX3440 or MAX3442 series. The MAX3440EASA+, MAX3440EASA+T, MAX3440EESA+, and MAX3440EESA+T variants support extended temperature ranges (-40°C ~ 125°C or -40°C ~ 85°C) compared to the original part's 0°C ~ 70°C specification, providing enhanced reliability for industrial applications. The MAX3442 series offers identical electrical characteristics with alternative packaging options (Tube or Tape & Reel).

For 3V ~ 3.6V low-voltage applications, the MAX3430 series (MAX3430CSA+, MAX3430ESA+, MAX3430ESA+T) provides functional equivalence but requires external voltage level translation if integration with 5V systems is necessary.

Packaging selection depends on procurement requirements: Tube packaging for standard quantities, Cut Tape (CT) & Digi-Reel for automated assembly, or Tape & Reel (TR) for high-volume production.

Frequently Asked Questions (FAQ)

Q: Can MAX3430 parts (3V ~ 3.6V) directly replace the DS36C280M/NOPB in a 5V system?

A: No. The MAX3430 series operates at 3V ~ 3.6V supply voltage, while the DS36C280M/NOPB requires 4.75V ~ 5.25V. Direct substitution would result in insufficient supply voltage. Use MAX3440 or MAX3442 series for 5V systems.

Q: What is the significance of receiver hysteresis difference (70 mV vs. 25 mV)?

A: The DS36C280M/NOPB has 70 mV receiver hysteresis, while all substitute parts have 25 mV. Lower hysteresis improves noise immunity in clean signal environments but may require careful PCB layout in noisy industrial settings. Functional compatibility is maintained within RS422/RS485 specifications.

Q: Are all substitute parts pin-compatible with the DS36C280M/NOPB?

A: Yes. All substitute parts use the 8-SOIC (0.154", 3.90mm Width) package with identical pinout for 1/1 half-duplex RS422/RS485 transceiver functionality.

Q: Which substitute part offers the widest operating temperature range?

A: MAX3440EASA+, MAX3440EASA+T, MAX3442EASA+, and MAX3442EASA+T support -40°C ~ 125°C, exceeding the original part's 0°C ~ 70°C range.

Q: What packaging options are available for high-volume production?

A: Tape & Reel (TR) packaging is available for MAX3440EASA+T, MAX3442EASA+T, and MAX3430ESA+T, optimized for automated pick-and-place assembly. Tube and Cut Tape (CT) & Digi-Reel options support lower-volume requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) rating, ensuring compatibility with environmental and regulatory requirements.

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