SN75LBC180ADRG4 Equivalent & Substitute Parts

Part Overview

The SN75LBC180ADRG4 is a full-duplex RS422/RS485 transceiver manufactured by Texas Instruments, housed in a 14-SOIC surface mount package. This part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design requirements and production needs. Substitute parts must maintain compatibility with the original electrical specifications and mechanical form factor while considering current product availability and status.

Key Parameters

Parameter	Value
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex	Full
Receiver Hysteresis	50 mV
Data Rate	30 Mbps
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Primary Compatibility Requirements:

Protocol: RS422/RS485 full-duplex transceiver
Package: 14-SOIC form factor
Number of Drivers/Receivers: 1/1 configuration
Receiver Hysteresis: 50 mV
Mounting Type: Surface Mount
RoHS3 Compliance

Secondary Considerations:

Data Rate capability (minimum 30 Mbps required for SN75LBC180ADRG4)
Supply voltage range compatibility
Operating temperature range
Product status and availability

The SN75LBC180ADR (Texas Instruments) is a direct equivalent with identical electrical specifications and packaging. The ADM3491 series (Analog Devices Inc.) represents a functional alternative with the same protocol support, package, and hysteresis specification, though with different supply voltage and operating temperature ranges.

Parameter Comparison

Parameter	SN75LBC180ADRG4	SN75LBC180ADR	ADM3491ARZ	ADM3491ARZ-REEL	ADM3491ARZ-REEL7
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.
Type	Transceiver	Transceiver	Transceiver	Transceiver	Transceiver
Protocol	RS422, RS485	RS422, RS485	RS422, RS485	RS422, RS485	RS422, RS485
Number of Drivers/Receivers	1/1	1/1	1/1	1/1	1/1
Duplex	Full	Full	Full	Full	Full
Receiver Hysteresis	50 mV	50 mV	50 mV	50 mV	50 mV
Data Rate	30 Mbps	30 Mbps	10 Mbps	10 Mbps	10 Mbps
Voltage - Supply	4.75V ~ 5.25V	4.75V ~ 5.25V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Discontinued	Obsolete	Active	Active	Active

Engineering Selection Recommendations

Direct Equivalent (Recommended for Pin-Compatible Replacement): SN75LBC180ADR is the primary substitute, offering identical electrical specifications and package configuration. This part maintains the 30 Mbps data rate and 4.75V–5.25V supply voltage range of the original. Product status is listed as Obsolete, indicating limited future availability.

Functional Alternative (For New Designs with Supply Voltage Flexibility): The ADM3491ARZ, ADM3491ARZ-REEL, and ADM3491ARZ-REEL7 are functionally equivalent transceivers with active product status and higher inventory levels. These parts support the same RS422/RS485 protocols, full-duplex operation, and 50 mV receiver hysteresis. Key differences include reduced data rate (10 Mbps versus 30 Mbps) and lower supply voltage range (3V–3.6V versus 4.75V–5.25V). All variants are ROHS3 compliant and suitable for applications where the lower data rate and supply voltage are compatible with system requirements.

Packaging Considerations:

SN75LBC180ADR: Available in Cut Tape (CT) and Digi-Reel packaging
ADM3491ARZ: Supplied in Tube packaging
ADM3491ARZ-REEL and ADM3491ARZ-REEL7: Available in Cut Tape (CT) and Digi-Reel packaging

Frequently Asked Questions (FAQ)

Q: Can ADM3491ARZ replace SN75LBC180ADRG4 in existing designs? A: The ADM3491ARZ is functionally compatible for RS422/RS485 communication at the protocol level. However, design verification is required if the application operates at data rates exceeding 10 Mbps or requires the 4.75V–5.25V supply voltage range. The ADM3491ARZ operates at 3V–3.6V and supports maximum 10 Mbps data rate.

Q: What is the difference between ADM3491ARZ, ADM3491ARZ-REEL, and ADM3491ARZ-REEL7? A: These are the same die and electrical specifications with different packaging and reel configurations. ADM3491ARZ is supplied in Tube packaging. ADM3491ARZ-REEL and ADM3491ARZ-REEL7 are supplied on Cut Tape with Digi-Reel, differing in reel specifications. Selection depends on procurement and assembly requirements.

Q: Is SN75LBC180ADR still available? A: SN75LBC180ADR is listed as Obsolete, indicating declining availability. For new production, the active ADM3491 series variants are recommended.

Q: Are all substitute parts ROHS3 compliant? A: Yes, all listed substitute parts are ROHS3 compliant, matching the compliance status of the original SN75LBC180ADRG4.

Q: What is the impact of the 10 Mbps data rate limit on ADM3491 parts? A: Applications requiring data rates above 10 Mbps must use SN75LBC180ADR (30 Mbps capability). For applications operating at 10 Mbps or below, the ADM3491 series is suitable.

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