MAX211IDB RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The MAX211IDB is a 4/4 full-duplex RS232 transceiver manufactured by Texas Instruments, housed in a 28-SSOP package. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and production continuity. The MAX211IDB operates within a 4.5V to 5.5V supply range with a 120 kbps data rate and 500 mV receiver hysteresis, making it suitable for legacy RS232 communication applications requiring full transceiver functionality.

Key Parameters

Parameter	Value
Manufacturer Part Number	MAX211IDB
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	4/5
Duplex	Full
Receiver Hysteresis	500 mV
Data Rate	120 kbps
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package / Case	28-SSOP (0.209", 5.30mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MAX211IDB is determined by strict equivalence across the following critical parameters:

Protocol: RS232
Number of Drivers/Receivers: 4/5
Duplex: Full
Data Rate: 120 kbps
Voltage - Supply: 4.5V ~ 5.5V
Operating Temperature: -40°C ~ 85°C
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Substitute parts are grouped into two categories based on package compatibility:

Category 1: 28-SSOP Package (Direct Pin-Compatible) Parts maintaining the original 28-SSOP (0.209", 5.30mm Width) package specification.

Category 2: 28-TSSOP Package (Alternative Package) Parts with equivalent electrical specifications but housed in 28-TSSOP (0.173", 4.40mm Width) package, requiring PCB layout modification.

Receiver hysteresis variations (500 mV vs. 650 mV) are noted but do not preclude substitution when all other parameters align, as this parameter falls within acceptable tolerance ranges for RS232 applications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Package	Receiver Hysteresis	Data Rate	Supply Voltage	Operating Temp	Inventory
MAX211IDB	Texas Instruments	Obsolete	28-SSOP	500 mV	120 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	2200 Pcs
MAX211IDBR	Texas Instruments	Active	28-SSOP	500 mV	120 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	1203 Pcs
TRS213IDB	Texas Instruments	Obsolete	28-SSOP	500 mV	120 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	9581 Pcs
MAX211EEAI+T	Analog Devices Inc./Maxim Integrated	Active	28-SSOP	500 mV	120 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	1276 Pcs
ADM211ARSZ	Analog Devices Inc.	Active	28-SSOP	650 mV	120 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	3943 Pcs
ADM211ARSZ-REEL	Analog Devices Inc.	Active	28-SSOP	650 mV	120 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	4803 Pcs
ADM211EARSZ	Analog Devices Inc.	Active	28-SSOP	650 mV	120 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	4083 Pcs
ADM211EARSZ-REEL	Analog Devices Inc.	Active	28-SSOP	650 mV	120 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	1480 Pcs
ADM211EARUZ	Analog Devices Inc.	Active	28-TSSOP	650 mV	120 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	2210 Pcs
ADM211EARUZ-REEL	Analog Devices Inc.	Active	28-TSSOP	650 mV	120 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	5718 Pcs
ADM211EARUZ-REEL7	Analog Devices Inc.	Active	28-TSSOP	650 mV	120 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	1508 Pcs

Engineering Selection Recommendations

For applications currently using the MAX211IDB, the following selection criteria apply:

Primary Recommendation (28-SSOP Package, Active Status): MAX211IDBR, MAX211EEAI+T, ADM211ARSZ, ADM211ARSZ-REEL, ADM211EARSZ, and ADM211EARSZ-REEL are all active products with full electrical equivalence to the MAX211IDB. These parts maintain the 28-SSOP package footprint, eliminating PCB redesign requirements. Selection among these options should be based on packaging preference (tube vs. reel) and manufacturer preference (Texas Instruments vs. Analog Devices Inc.).

Secondary Recommendation (28-SSOP Package, Obsolete Status): TRS213IDB provides parametric equivalence with the original MAX211IDB and maintains the 28-SSOP package. However, this part is also classified as obsolete and should be considered only when active alternatives are unavailable.

Alternative Recommendation (28-TSSOP Package, Active Status): ADM211EARUZ, ADM211EARUZ-REEL, and ADM211EARUZ-REEL7 offer active product status with equivalent electrical specifications but require PCB layout modification due to the 28-TSSOP package (0.173", 4.40mm Width vs. 0.209", 5.30mm Width). These parts are suitable for new designs or redesigned applications where package footprint adjustment is feasible.

All recommended substitutes maintain ROHS3 compliance and MSL 1 rating, ensuring regulatory and environmental compatibility with the original specification.

Frequently Asked Questions (FAQ)

Q: Can MAX211IDBR be used as a direct replacement for MAX211IDB? A: Yes. MAX211IDBR is electrically and functionally equivalent to MAX211IDB, maintaining identical specifications for protocol (RS232), driver/receiver configuration (4/5), duplex mode (full), data rate (120 kbps), supply voltage (4.5V ~ 5.5V), operating temperature (-40°C ~ 85°C), and package (28-SSOP). The primary difference is product status: MAX211IDBR is active while MAX211IDB is obsolete.

Q: What is the difference between ADM211ARSZ and ADM211EARSZ? A: Both parts are manufactured by Analog Devices Inc. and maintain identical electrical specifications and 28-SSOP packaging. The difference lies in packaging format: ADM211ARSZ is supplied in tube packaging, while ADM211EARSZ is supplied in tube packaging as well. ADM211ARSZ-REEL and ADM211EARSZ-REEL variants are available in reel format for automated assembly processes.

Q: Why do some substitute parts have 650 mV receiver hysteresis instead of 500 mV? A: Receiver hysteresis is a specified parameter that differs between manufacturers. Both 500 mV and 650 mV hysteresis values are within acceptable ranges for RS232 transceiver operation and do not preclude functional substitution. The higher hysteresis value (650 mV) provides increased noise immunity in certain applications.

Q: Can ADM211EARUZ (28-TSSOP package) replace MAX211IDB (28-SSOP package)? A: ADM211EARUZ is electrically equivalent to MAX211IDB but uses a different package footprint (28-TSSOP vs. 28-SSOP). Direct PCB substitution is not possible without layout modification. The 28-TSSOP package is narrower (0.173" vs. 0.209" width), requiring PCB redesign. This option is suitable for new designs or applications undergoing PCB revision.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original MAX211IDB specification.

Q: Which substitute part has the highest inventory availability? A: TRS213IDB has the highest inventory at 9581 pieces. However, this part is classified as obsolete. Among active products, ADM211EARUZ-REEL offers the highest inventory at 5718 pieces.

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