TRS211IDB RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The TRS211IDB is a 4/5 full-duplex RS232 transceiver manufactured by Texas Instruments in a 28-SSOP surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The TRS211IDB operates across the industrial temperature range of -40°C to 85°C with a 4.5V to 5.5V supply voltage, supporting data rates up to 120 kbps with 500 mV receiver hysteresis.

Key Parameters

Parameter	Value
Manufacturer Part Number	TRS211IDB
Manufacturer	Texas Instruments
Category	Interface
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
Mounting Type	Surface Mount
Package / Case	28-SSOP (0.209", 5.30mm Width)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the TRS211IDB is determined by strict electrical and mechanical parameter matching. The following criteria define valid equivalents and substitutes:

Primary Substitution Criteria:

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 (MSL): 1 (Unlimited)

Secondary Considerations:

Receiver Hysteresis: 500 mV (TRS211IDB) vs. 650 mV (ADM211 series) — both values are acceptable within RS232 specifications
Package / Case: 28-SSOP (0.209", 5.30mm Width) is the primary package; 28-TSSOP (0.173", 4.40mm Width) represents a package variant with identical electrical performance but different physical dimensions

Substitutes are grouped into two categories:

Texas Instruments Direct Equivalents — Same manufacturer, identical electrical specifications, different product status or packaging
Analog Devices Cross-Manufacturer Equivalents — Different manufacturer, all electrical parameters within specification, active product status

Parameter Comparison

Part Number	Manufacturer	Product Status	Protocol	Drivers/Receivers	Duplex	Receiver Hysteresis	Data Rate	Supply Voltage	Operating Temp	Package	RoHS
TRS211IDB	Texas Instruments	Obsolete	RS232	4/5	Full	500 mV	120 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	28-SSOP	ROHS3
MAX211IDBR	Texas Instruments	Active	RS232	4/5	Full	500 mV	120 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	28-SSOP	ROHS3
MAX211IDB	Texas Instruments	Obsolete	RS232	4/5	Full	500 mV	120 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	28-SSOP	ROHS3
TRS213IDB	Texas Instruments	Obsolete	RS232	4/5	Full	500 mV	120 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	28-SSOP	ROHS3
ADM211ARSZ	Analog Devices Inc.	Active	RS232	4/5	Full	650 mV	120 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	28-SSOP	ROHS3
ADM211ARSZ-REEL	Analog Devices Inc.	Active	RS232	4/5	Full	650 mV	120 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	28-SSOP	ROHS3
ADM211EARSZ	Analog Devices Inc.	Active	RS232	4/5	Full	650 mV	120 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	28-SSOP	ROHS3
ADM211EARSZ-REEL	Analog Devices Inc.	Active	RS232	4/5	Full	650 mV	120 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	28-SSOP	ROHS3
ADM211EARUZ	Analog Devices Inc.	Active	RS232	4/5	Full	650 mV	120 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	28-TSSOP	ROHS3
ADM211EARUZ-REEL	Analog Devices Inc.	Active	RS232	4/5	Full	650 mV	120 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	28-TSSOP	ROHS3
ADM211EARUZ-REEL7	Analog Devices Inc.	Active	RS232	4/5	Full	650 mV	120 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	28-TSSOP	ROHS3

Engineering Selection Recommendations

Primary Recommendation — Active Product Status: MAX211IDBR is the preferred substitute for new designs and production continuity. This part maintains identical electrical specifications to the TRS211IDB while offering active product status from Texas Instruments, ensuring long-term availability and manufacturing support.

Cross-Manufacturer Alternative — Analog Devices: The ADM211 series (ADM211ARSZ, ADM211EARSZ, and their reel variants) provides functionally equivalent RS232 transceiver performance with active product status. These parts are manufactured by Analog Devices Inc. and meet all electrical requirements. The receiver hysteresis specification of 650 mV is within acceptable RS232 operating margins compared to the TRS211IDB's 500 mV.

Package Considerations:

28-SSOP variants (ADM211ARSZ, ADM211EARSZ) maintain the original TRS211IDB package footprint
28-TSSOP variants (ADM211EARUZ, ADM211EARUZ-REEL, ADM211EARUZ-REEL7) offer a narrower package (0.173" vs. 0.209" width) suitable for space-constrained applications with identical electrical performance

Compliance Status: All substitute parts listed are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity, matching the original part's environmental certifications.

Frequently Asked Questions (FAQ)

Q: Can MAX211IDBR be used as a direct replacement for TRS211IDB? A: Yes. MAX211IDBR is electrically and mechanically identical to TRS211IDB with the same 28-SSOP package, supply voltage range (4.5V ~ 5.5V), operating temperature (-40°C ~ 85°C), and RS232 protocol specifications. The primary difference is product status: MAX211IDBR is active while TRS211IDB is obsolete.

Q: What is the difference between 28-SSOP and 28-TSSOP packages? A: Both packages contain 28 pins and are suitable for surface mount assembly. The 28-SSOP is 0.209" wide (5.30mm), while the 28-TSSOP is 0.173" wide (4.40mm). The narrower TSSOP variant is used in the ADM211EARUZ series. Electrical performance is identical; package selection depends on PCB layout constraints.

Q: Why do ADM211 parts have 650 mV receiver hysteresis instead of 500 mV? A: Both 500 mV and 650 mV receiver hysteresis values are within RS232 specification tolerances. The ADM211 series operates reliably across the full RS232 input voltage range with the higher hysteresis value, ensuring noise immunity in industrial environments.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All substitute parts listed (MAX211IDBR, MAX211IDB, TRS213IDB, and all ADM211 variants) are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity, matching the original TRS211IDB environmental certifications.

Q: What packaging options are available for production? A: Texas Instruments MAX211IDBR is supplied in Cut Tape (CT) & Digi-Reel® packaging. Analog Devices ADM211 series offers multiple packaging options: Tube (ADM211ARSZ, ADM211EARSZ), Cut Tape & Digi-Reel® (ADM211EARSZ-REEL, ADM211EARUZ-REEL7), and Tape & Reel (ADM211EARUZ-REEL).

Q: Can TRS213IDB be used as a substitute? A: Yes. TRS213IDB meets all electrical parameter requirements for substitution. However, it is also classified as obsolete. For new designs requiring long-term availability, MAX211IDBR or active ADM211 variants are preferred.

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