MAX1482CSD-T RS422/RS485 Transceiver Equivalent & Substitute Parts

Part Overview

The MAX1482CSD-T is a 1/1 full-duplex RS422/RS485 transceiver manufactured by Analog Devices Inc./Maxim Integrated in a 14-SOIC surface mount package. This part is classified as obsolete, with 962 units currently in stock. Due to its obsolete status, identifying equivalent and substitute parts is essential for design continuity, long-term supply chain planning, and new production runs. Active alternatives with identical or enhanced electrical characteristics are available from the same manufacturer family.

Key Parameters

Parameter	Value
Manufacturer Part Number	MAX1482CSD-T
Manufacturer	Analog Devices Inc./Maxim Integrated
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex	Full
Receiver Hysteresis	75 mV
Data Rate	250 kbps
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the MAX1482CSD-T is determined by strict adherence to the following electrical and mechanical parameters:

Core Substitution Criteria:

Protocol: RS422/RS485 full-duplex transceiver
Number of Drivers/Receivers: 1/1 configuration
Duplex Mode: Full-duplex operation
Supply Voltage Range: 4.75V ~ 5.25V
Operating Temperature Range: 0°C ~ 70°C
Mounting Type: Surface Mount
Package Type: 14-SOIC or equivalent 14-pin SOIC footprint
Receiver Hysteresis: 20 mV to 75 mV (acceptable range for RS422/RS485 operation)
Data Rate: Minimum 250 kbps (higher rates are acceptable)

Substitute Categories:

Parametric Equivalent (Direct Replacement): MAX1482CSD+T — identical electrical specifications with active product status and improved RoHS compliance.
Manufacturer Recommended Alternatives: LT1791CS#PBF, LT1791CS#TRPBF, LTC1687CS#PBF, LTC1687CS#TRPBF, LTC491CS#PBF, LTC491CS#TRPBF — all meet core substitution criteria with active status and RoHS3 compliance.

Parameter Comparison

Part Number	Manufacturer	Product Status	Protocol	Drivers/Receivers	Receiver Hysteresis	Data Rate	Supply Voltage	Operating Temp	Package	RoHS Status	Inventory
MAX1482CSD-T	Analog Devices Inc./Maxim Integrated	Obsolete	RS422, RS485	1/1	75 mV	250 kbps	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	RoHS non-compliant	962 Pcs
MAX1482CSD+T	Analog Devices Inc./Maxim Integrated	Active	RS422, RS485	1/1	75 mV	250 kbps	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	ROHS3 Compliant	3600 Pcs
LT1791CS#PBF	Analog Devices Inc.	Active	RS422, RS485	1/1	20 mV	250 kbps	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	ROHS3 Compliant	1136 Pcs
LT1791CS#TRPBF	Analog Devices Inc.	Active	RS422, RS485	1/1	20 mV	250 kbps	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	ROHS3 Compliant	1364 Pcs
LTC1687CS#PBF	Analog Devices Inc.	Active	RS422, RS485	1/1	25 mV	52 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	ROHS3 Compliant	2502 Pcs
LTC1687CS#TRPBF	Analog Devices Inc.	Active	RS422, RS485	1/1	25 mV	52 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	ROHS3 Compliant	1498 Pcs
LTC491CS#PBF	Analog Devices Inc.	Active	RS422, RS485	1/1	70 mV	Not specified	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	ROHS3 Compliant	1127 Pcs
LTC491CS#TRPBF	Analog Devices Inc.	Active	RS422, RS485	1/1	70 mV	Not specified	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	ROHS3 Compliant	2022 Pcs

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): MAX1482CSD+T is the primary choice. It maintains identical electrical parameters (75 mV receiver hysteresis, 250 kbps data rate) and mechanical compatibility while offering active product status and ROHS3 compliance. Higher inventory availability (3600 units) supports production continuity.

For Enhanced Performance with Compliance: LTC1687CS#PBF or LTC1687CS#TRPBF provide superior data rate capability (52 Mbps versus 250 kbps) while maintaining all core electrical and mechanical requirements. These parts are ROHS3 compliant and active. The Tape & Reel variant (TRPBF) is recommended for high-volume production.

For Hysteresis-Matched Alternatives: LTC491CS#PBF or LTC491CS#TRPBF offer receiver hysteresis of 70 mV, closely matching the original 75 mV specification. Both are ROHS3 compliant and active. The Tape & Reel variant (TRPBF) provides higher inventory (2022 units).

For Compliance-Critical Applications: All substitute parts listed are ROHS3 compliant, addressing the non-compliant status of the original MAX1482CSD-T. Selection should prioritize active product status and available inventory for supply chain resilience.

Frequently Asked Questions (FAQ)

Q: Can MAX1482CSD+T be used as a direct replacement for MAX1482CSD-T? A: Yes. MAX1482CSD+T is a parametric equivalent with identical electrical specifications (1/1 full-duplex RS422/RS485, 75 mV receiver hysteresis, 250 kbps data rate, 4.75V–5.25V supply, 0°C–70°C operating range) and compatible 14-SOIC packaging. The primary difference is active product status and ROHS3 compliance.

Q: What is the difference between LT1791CS#PBF and LT1791CS#TRPBF? A: Both parts are electrically identical (20 mV receiver hysteresis, 250 kbps data rate, RS422/RS485 protocol). The difference is packaging: PBF denotes Tube packaging for lower-volume applications, while TRPBF denotes Tape & Reel packaging optimized for automated assembly and high-volume production.

Q: Why does LTC1687CS offer 52 Mbps data rate instead of 250 kbps? A: LTC1687CS is a higher-performance variant within the same 1/1 full-duplex RS422/RS485 transceiver family. The enhanced data rate (52 Mbps) is backward compatible with 250 kbps applications and provides design flexibility for future bandwidth requirements. All other electrical and mechanical parameters remain compatible.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All substitute parts listed (MAX1482CSD+T, LT1791CS variants, LTC1687CS variants, LTC491CS variants) are ROHS3 compliant. The original MAX1482CSD-T is RoHS non-compliant, making substitution necessary for regulatory compliance in new designs.

Q: What is the significance of receiver hysteresis variation (20 mV to 75 mV)? A: Receiver hysteresis determines the voltage differential required to switch the receiver output, affecting noise immunity and signal integrity. All listed substitutes (20–75 mV range) meet RS422/RS485 specifications. Selection should match the original 75 mV specification (MAX1482CSD+T, LTC491CS variants) for direct compatibility, or accept lower hysteresis values (LT1791CS, LTC1687CS) if the application tolerates improved noise immunity.

Q: Can I use LTC1687CS in place of MAX1482CSD-T in existing designs? A: Yes, with verification. LTC1687CS maintains identical supply voltage (4.75V–5.25V), operating temperature (0°C–70°C), and 14-SOIC packaging. The lower receiver hysteresis (25 mV versus 75 mV) and higher data rate (52 Mbps versus 250 kbps) are compatible with RS422/RS485 protocol requirements. Functional testing is recommended to confirm performance in the specific application environment.

Q: Which packaging option should I select for production? A: For automated assembly and high-volume production, select Tape & Reel (TR) variants (e.g., MAX1482CSD+T, LT1791CS#TRPBF, LTC1687CS#TRPBF, LTC491CS#TRPBF). For lower-volume or manual assembly, Tube packaging (PBF variants) is acceptable. Inventory availability should also inform selection.

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