MAX208IDB RS232 Transceiver 4/4 Full Duplex Equivalent & Substitute Parts

Part Overview

The MAX208IDB is a full-duplex RS232 transceiver IC with 4 drivers and 4 receivers in a 24-SSOP surface mount package, manufactured by Texas Instruments. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The MAX208IDB operates across the industrial temperature range of -40°C to 85°C with a 120 kbps data rate and 4.5V to 5.5V supply voltage. Substitute parts must maintain electrical compatibility while meeting current product availability and compliance requirements.

Key Parameters

Parameter	Specification
Part Number	MAX208IDB
Manufacturer	Texas Instruments
Category	Interface
Type	Transceiver
Protocol	RS232
Drivers/Receivers	4/4
Duplex	Full
Package/Case	24-SSOP (0.209", 5.30mm Width)
Mounting Type	Surface Mount
Data Rate	120 kbps
Voltage Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Receiver Hysteresis	500 mV
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the MAX208IDB are grouped based on strict electrical and mechanical parameter compatibility. The primary substitution criteria are:

Critical Parameters for Substitution:

Protocol: RS232
Drivers/Receivers: 4/4 configuration
Duplex: Full
Voltage Supply: 4.5V ~ 5.5V
Operating Temperature: -40°C ~ 85°C
Package/Case: 24-SSOP or 24-TSSOP
Mounting Type: Surface Mount
Data Rate: 120 kbps minimum
Receiver Hysteresis: 500 mV or 650 mV (acceptable variation)

Grouping Categories:

Group 1: Direct Electrical Equivalents (24-SSOP Package) Parts with identical electrical specifications and 24-SSOP packaging, differing only in manufacturer or product status (Active vs. Obsolete).

Group 2: Enhanced Performance Variants (24-SSOP Package) Parts with higher data rates (230 kbps) and 650 mV receiver hysteresis, maintaining 24-SSOP packaging and full compatibility with MAX208IDB applications.

Group 3: Compact Package Variants (24-TSSOP Package) Parts with enhanced performance specifications in a smaller 24-TSSOP footprint (0.173", 4.40mm Width), suitable for space-constrained designs with PCB layout modifications.

Group 4: Obsolete Alternatives Parts from alternative manufacturers with matching specifications but obsolete status, included for reference in legacy system support.

Parameter Comparison

Part Number	Manufacturer	Product Status	Package	Data Rate	Receiver Hysteresis	Operating Temp	Voltage Supply	Drivers/Receivers	RoHS Status
MAX208IDB	Texas Instruments	Obsolete	24-SSOP	120 kbps	500 mV	-40°C ~ 85°C	4.5V ~ 5.5V	4/4	ROHS3
TRS208IDBR	Texas Instruments	Active	24-SSOP	120 kbps	500 mV	-40°C ~ 85°C	4.5V ~ 5.5V	4/4	ROHS3
MAX208EEAG+T	Analog Devices Inc./Maxim Integrated	Active	24-SSOP	120 kbps	500 mV	-40°C ~ 85°C	4.5V ~ 5.5V	4/4	ROHS3
ADM208ARSZ	Analog Devices Inc.	Active	24-SSOP	120 kbps	650 mV	-40°C ~ 85°C	4.5V ~ 5.5V	4/4	ROHS3
ADM208ARSZ-REEL	Analog Devices Inc.	Active	24-SSOP	120 kbps	650 mV	-40°C ~ 85°C	4.5V ~ 5.5V	4/4	ROHS3
ADM208EARSZ	Analog Devices Inc.	Active	24-SSOP	230 kbps	650 mV	-40°C ~ 85°C	4.5V ~ 5.5V	4/4	ROHS3
ADM208EARSZ-REEL	Analog Devices Inc.	Active	24-SSOP	230 kbps	650 mV	-40°C ~ 85°C	4.5V ~ 5.5V	4/4	ROHS3
ADM208EARUZ	Analog Devices Inc.	Active	24-TSSOP	230 kbps	650 mV	-40°C ~ 85°C	4.5V ~ 5.5V	4/4	ROHS3
ADM208EARUZ-REEL	Analog Devices Inc.	Active	24-TSSOP	230 kbps	650 mV	-40°C ~ 85°C	4.5V ~ 5.5V	4/4	ROHS3
HIN208EIAZ	Renesas Electronics Corporation	Obsolete	24-SSOP	230 kbps	500 mV	-40°C ~ 85°C	4.5V ~ 5.5V	4/4	ROHS3
MAX208CAG+	Analog Devices Inc./Maxim Integrated	Active	24-SSOP	120 kbps	500 mV	0°C ~ 70°C	4.5V ~ 5.5V	4/4	ROHS3

Engineering Selection Recommendations

Primary Recommendation: TRS208IDBR The TRS208IDBR from Texas Instruments is the direct active equivalent to the MAX208IDB. It maintains identical electrical specifications, packaging, and operating parameters while offering active product status with current manufacturing support. This part is suitable for direct replacement in all MAX208IDB applications without design modifications.

Secondary Recommendation: MAX208EEAG+T The MAX208EEAG+T from Analog Devices Inc./Maxim Integrated provides electrical equivalence with active product status. Tape & Reel packaging is available for high-volume production requirements. This part is compatible with all MAX208IDB circuit designs.

Enhanced Performance Option: ADM208EARSZ or ADM208EARSZ-REEL For applications requiring higher data rates, the ADM208EARSZ series offers 230 kbps performance with 650 mV receiver hysteresis in 24-SSOP packaging. These parts maintain full backward compatibility with MAX208IDB designs while providing improved signal integrity margins. Available in both Tube and Tape & Reel packaging.

Compact Package Option: ADM208EARUZ or ADM208EARUZ-REEL The ADM208EARUZ series provides enhanced performance (230 kbps, 650 mV hysteresis) in a smaller 24-TSSOP footprint. This option requires PCB layout modifications due to package size reduction but is suitable for space-constrained applications. Available in both Tube and Tape & Reel packaging.

Temperature Range Consideration: MAX208CAG+ The MAX208CAG+ operates across a commercial temperature range (0°C ~ 70°C) rather than industrial range. This part is suitable only for applications with restricted operating temperature requirements and is not recommended as a general replacement for industrial-grade MAX208IDB designs.

Compliance Status: All recommended substitute parts maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with modern manufacturing processes and long-term storage requirements.

Frequently Asked Questions (FAQ)

Q: Can TRS208IDBR be used as a direct replacement for MAX208IDB? A: Yes. The TRS208IDBR is electrically and mechanically identical to the MAX208IDB, differing only in product status (Active vs. Obsolete). No design modifications are required.

Q: What is the difference between ADM208ARSZ and ADM208EARSZ? A: The ADM208EARSZ offers double the data rate (230 kbps vs. 120 kbps) and maintains higher receiver hysteresis (650 mV). Both parts are pin-compatible and operate across identical voltage and temperature ranges. The ADM208EARSZ provides enhanced performance for applications requiring higher baud rates.

Q: Can I use ADM208EARUZ (24-TSSOP) instead of MAX208IDB (24-SSOP)? A: The ADM208EARUZ is electrically compatible but requires PCB layout modifications due to different package dimensions. The 24-TSSOP package is smaller (0.173" vs. 0.209" width) and has different pin spacing. This substitution is suitable only for new designs with modified PCB layouts.

Q: What does receiver hysteresis of 650 mV mean compared to 500 mV? A: Receiver hysteresis defines the voltage difference between input threshold levels for logic transitions. Higher hysteresis (650 mV) provides greater noise immunity and signal integrity margins. Parts with 650 mV hysteresis are suitable for all applications designed for 500 mV hysteresis.

Q: Is MAX208CAG+ suitable for industrial applications? A: No. The MAX208CAG+ operates across a commercial temperature range (0°C ~ 70°C), not the industrial range (-40°C ~ 85°C) of the MAX208IDB. This part is suitable only for applications with restricted operating temperature requirements.

Q: What packaging options are available for substitute parts? A: Substitute parts are available in Tube, Cut Tape (CT) & Digi-Reel®, and Tape & Reel (TR) packaging. Tube packaging is suitable for low-volume applications. Tape & Reel packaging is required for automated assembly and high-volume production. Cut Tape & Digi-Reel® provides flexibility for medium-volume requirements.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with modern manufacturing processes and environmental regulations.

Q: Can I mix different substitute parts in the same design? A: Yes, provided all parts meet the electrical requirements of your application. However, using a single part number across a design simplifies procurement, inventory management, and troubleshooting.

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