TRS211CDB Equivalent & Substitute Parts

Part Overview

The TRS211CDB is a 4/5 full-duplex RS232 transceiver IC in 28-SSOP surface mount packaging, manufactured by Texas Instruments. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs. The TRS211CDB operates within a 4.5V to 5.5V supply range with a 120 kbps data rate and 500 mV receiver hysteresis, designed for industrial and commercial RS232 communication applications.

Key Parameters

Parameter	Value
Part Number	TRS211CDB
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS232
Drivers/Receivers	4/5
Duplex	Full
Data Rate	120 kbps
Supply Voltage	4.5V – 5.5V
Operating Temperature	0°C – 70°C
Package	28-SSOP (0.209", 5.30mm Width)
Receiver Hysteresis	500 mV
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the TRS211CDB is determined by strict electrical and mechanical compatibility across the following parameters:

Critical Matching Parameters:

Protocol: RS232
Drivers/Receivers: 4/5 configuration
Duplex: Full
Data Rate: 120 kbps
Supply Voltage: 4.5V – 5.5V
Package Type: 28-SSOP or 28-TSSOP
Receiver Hysteresis: 500 mV or 650 mV (acceptable variance)
RoHS Compliance: ROHS3 Compliant
MSL Rating: 1 (Unlimited)

Substitute parts are grouped into two categories based on product status and operating temperature range. Active product status substitutes provide extended temperature operation (-40°C to 85°C) compared to the original part's 0°C to 70°C range. Package variants (28-SSOP vs. 28-TSSOP) are listed separately due to mechanical differences, though both are electrically compatible.

Parameter Comparison

Part Number	Manufacturer	Status	Package	Drivers/Receivers	Data Rate	Supply Voltage	Operating Temp	Receiver Hysteresis	RoHS
TRS211CDB	Texas Instruments	Obsolete	28-SSOP	4/5	120 kbps	4.5V – 5.5V	0°C – 70°C	500 mV	ROHS3
MAX211IDBR	Texas Instruments	Active	28-SSOP	4/5	120 kbps	4.5V – 5.5V	-40°C – 85°C	500 mV	ROHS3
MAX211EEAI+	Analog Devices Inc./Maxim Integrated	Active	28-SSOP	4/5	120 kbps	4.5V – 5.5V	-40°C – 85°C	500 mV	ROHS3
MAX211EEAI+T	Analog Devices Inc./Maxim Integrated	Active	28-SSOP	4/5	120 kbps	4.5V – 5.5V	-40°C – 85°C	500 mV	ROHS3
ADM211ARSZ	Analog Devices Inc.	Active	28-SSOP	4/5	120 kbps	4.5V – 5.5V	-40°C – 85°C	650 mV	ROHS3
ADM211ARSZ-REEL	Analog Devices Inc.	Active	28-SSOP	4/5	120 kbps	4.5V – 5.5V	-40°C – 85°C	650 mV	ROHS3
ADM211EARSZ	Analog Devices Inc.	Active	28-SSOP	4/5	120 kbps	4.5V – 5.5V	-40°C – 85°C	650 mV	ROHS3
ADM211EARSZ-REEL	Analog Devices Inc.	Active	28-SSOP	4/5	120 kbps	4.5V – 5.5V	-40°C – 85°C	650 mV	ROHS3
ADM211EARUZ	Analog Devices Inc.	Active	28-TSSOP	4/5	120 kbps	4.5V – 5.5V	-40°C – 85°C	650 mV	ROHS3
ADM211EARUZ-REEL	Analog Devices Inc.	Active	28-TSSOP	4/5	120 kbps	4.5V – 5.5V	-40°C – 85°C	650 mV	ROHS3
ADM211EARUZ-REEL7	Analog Devices Inc.	Active	28-TSSOP	4/5	120 kbps	4.5V – 5.5V	-40°C – 85°C	650 mV	ROHS3

Engineering Selection Recommendations

All listed substitute parts maintain full electrical compatibility with the TRS211CDB across the RS232 protocol, 4/5 driver/receiver configuration, and 120 kbps data rate. All substitutes are ROHS3 compliant with MSL rating 1 (Unlimited), matching the original part's environmental certifications.

The MAX211IDBR, MAX211EEAI+, and MAX211EEAI+T variants provide direct electrical equivalence with 500 mV receiver hysteresis matching the TRS211CDB specification. These parts are manufactured by Texas Instruments and Analog Devices Inc./Maxim Integrated, both active product lines with extended operating temperature ranges (-40°C to 85°C).

The ADM211 series (ADM211ARSZ, ADM211EARSZ, and variants) operates with 650 mV receiver hysteresis, which is within acceptable tolerance for RS232 applications. These parts are available in both 28-SSOP and 28-TSSOP packages. The 28-TSSOP variants (ADM211EARUZ, ADM211EARUZ-REEL, ADM211EARUZ-REEL7) offer a narrower package footprint (0.173" vs. 0.209" width) while maintaining identical electrical performance.

Packaging variants (Tube, Cut Tape & Digi-Reel, Tape & Reel) do not affect electrical compatibility and are selected based on procurement and assembly requirements.

Frequently Asked Questions (FAQ)

Q: Can MAX211IDBR replace TRS211CDB directly? A: Yes. The MAX211IDBR is electrically equivalent with matching 4/5 driver/receiver configuration, 120 kbps data rate, 500 mV receiver hysteresis, and 28-SSOP package. The extended operating temperature range (-40°C to 85°C) provides additional margin beyond the original 0°C to 70°C specification.

Q: What is the difference between 28-SSOP and 28-TSSOP packages? A: Both packages are electrically identical RS232 transceivers with the same pin configuration. The 28-TSSOP (0.173" width) is a thinner variant compared to 28-SSOP (0.209" width). Package selection depends on PCB layout constraints and assembly equipment compatibility. Mechanical footprints differ and require appropriate land pattern design.

Q: Why do ADM211 parts have 650 mV receiver hysteresis instead of 500 mV? A: The ADM211 series maintains full RS232 protocol compliance with 650 mV receiver hysteresis, which is within the RS232 standard tolerance. This higher hysteresis value provides improved noise immunity in industrial environments while remaining functionally compatible with systems designed for 500 mV hysteresis.

Q: Is the TRS211CDB obsolete status a concern for substitution? A: The obsolete status of TRS211CDB indicates Texas Instruments has discontinued this part. All listed substitutes are active products from established manufacturers (Texas Instruments, Analog Devices Inc./Maxim Integrated), ensuring long-term availability and supply chain stability.

Q: Do all substitute parts meet the same compliance standards? A: Yes. All substitute parts listed are ROHS3 compliant with MSL rating 1 (Unlimited), matching the original TRS211CDB certifications. REACH status is unaffected for all parts, and ECCN classification remains EAR99.

Q: Can I use ADM211EARUZ-REEL7 in place of ADM211EARUZ? A: Yes. Both parts are electrically identical ADM211 variants in 28-TSSOP package with 650 mV receiver hysteresis. The packaging designation (-REEL7 vs. -REEL) indicates different reel configurations for automated assembly. Selection depends on your assembly equipment specifications.

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