SN75LBC184D Equivalent & Substitute Parts

Part Overview

The SN75LBC184D is a half-duplex RS422/RS485 transceiver manufactured by Texas Instruments in 8-SOIC surface mount packaging. This interface IC is designed for industrial communication applications requiring reliable data transmission over twisted-pair cabling. The part is currently in Last Time Buy status, making equivalent and substitute parts essential for ongoing design support and production continuity. Identifying compatible alternatives ensures uninterrupted supply chain access while maintaining electrical and mechanical compatibility with existing designs.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN75LBC184D
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex	Half
Receiver Hysteresis	70 mV
Data Rate	250 kbps
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitution of the SN75LBC184D is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

Protocol support: RS422 and/or RS485 compatibility
Duplex mode: Half-duplex operation
Number of drivers/receivers: 1/1 configuration
Receiver hysteresis: 70 mV (for parametric equivalents)
Data rate: 250 kbps minimum
Supply voltage range: 4.75V ~ 5.25V (or compatible overlap)
Package type: 8-SOIC form factor
Mounting type: Surface mount

Substitute parts are categorized into two groups:

MFR Recommended Substitutes: Parts meeting all primary criteria with active product status and full protocol support (RS422/RS485).

Parametric Equivalents: Parts matching all electrical parameters and package specifications, with identical receiver hysteresis (70 mV) and operating characteristics, ensuring direct functional replacement.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Protocol	Receiver Hysteresis	Data Rate	Supply Voltage	Operating Temperature	Package	Product Status
SN75LBC184D	Texas Instruments	RS422, RS485	70 mV	250 kbps	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Last Time Buy
SN65LBC184DR	UMW	RS485	70 mV	250 kbps	4.75V ~ 5.25V	-40°C ~ 105°C	8-SOIC	Active
ADM483EARZ	Analog Devices Inc.	RS422, RS485	70 mV	250 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
ADM483EARZ-REEL	Analog Devices Inc.	RS422, RS485	70 mV	250 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
SP3494CN-L/TR	MaxLinear, Inc.	RS422, RS485	20 mV	2.5 Mbps	3V ~ 3.6V	0°C ~ 70°C	8-SOIC	Active
SP3494EN-L	MaxLinear, Inc.	RS422, RS485	20 mV	2.5 Mbps	3V ~ 3.6V	-40°C ~ 85°C	8-SOIC	Active
SP3494EN-L/TR	MaxLinear, Inc.	RS422, RS485	20 mV	2.5 Mbps	3V ~ 3.6V	-40°C ~ 85°C	8-SOIC	Active
SP483EEN-L/TR	MaxLinear, Inc.	RS422, RS485	20 mV	250 kbps	4.75V ~ 5.25V	-40°C ~ 85°C	8-SOIC	Active
ADM483JRZ	Analog Devices Inc.	RS422, RS485	70 mV	250 kbps	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Active
MAX483CSA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	70 mV	250 kbps	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Active
MAX483ECSA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	70 mV	250 kbps	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Active

Engineering Selection Recommendations

Direct Parametric Equivalents (Highest Compatibility):

ADM483JRZ, MAX483CSA+, and MAX483ECSA+ are parametric equivalents with identical electrical specifications, receiver hysteresis, data rate, and operating temperature range matching the SN75LBC184D. These parts are manufactured by Analog Devices Inc./Maxim Integrated and maintain active product status with ROHS3 compliance. Selection from this group ensures pin-for-pin compatibility and identical circuit behavior.

MFR Recommended Substitutes with Extended Temperature Range:

ADM483EARZ and ADM483EARZ-REEL offer extended operating temperature range (-40°C to 85°C) while maintaining identical receiver hysteresis (70 mV), data rate (250 kbps), and RS422/RS485 protocol support. Supply voltage range is slightly broader (4.5V ~ 5.5V). Both are active products with ROHS3 compliance. ADM483EARZ-REEL is supplied on cut tape and digi-reel for high-volume applications.

MFR Recommended Substitute with Enhanced Performance:

SP483EEN-L/TR maintains the 4.75V ~ 5.25V supply voltage and 250 kbps data rate of the original part while offering extended temperature range (-40°C to 85°C). This MaxLinear part features reduced receiver hysteresis (20 mV) and is available in cut tape and digi-reel packaging. ROHS3 compliant with REACH unaffected status.

Alternative Supply Source:

SN65LBC184DR from UMW provides RS485 protocol support with identical receiver hysteresis (70 mV) and data rate (250 kbps). Extended operating temperature range (-40°C to 105°C) and active product status support long-term availability. Note: RS422 protocol support is not specified for this variant.

Higher Performance Alternatives:

SP3494 series (SP3494CN-L/TR, SP3494EN-L, SP3494EN-L/TR) from MaxLinear offer 10x higher data rate (2.5 Mbps) and lower receiver hysteresis (20 mV). These parts require 3V ~ 3.6V supply voltage and are not suitable for direct substitution in 5V-only designs. Selection requires circuit redesign and power supply modification.

Frequently Asked Questions (FAQ)

Q: Can I use SP3494 series parts as direct replacements for SN75LBC184D?

A: No. SP3494 series parts operate at 3V ~ 3.6V supply voltage, incompatible with the SN75LBC184D's 4.75V ~ 5.25V requirement. Circuit redesign and power supply modification are necessary. These parts are suitable only for new 3.3V designs requiring higher data rates.

Q: What is the difference between ADM483EARZ and ADM483EARZ-REEL?

A: Both parts are electrically identical with identical specifications. The difference is packaging: ADM483EARZ is supplied in tube packaging, while ADM483EARZ-REEL is supplied on cut tape and digi-reel. Selection depends on production volume and assembly equipment compatibility.

Q: Are MAX483CSA+ and MAX483ECSA+ interchangeable?

A: Yes. Both parts are parametric equivalents with identical electrical specifications, receiver hysteresis (70 mV), data rate (250 kbps), supply voltage (4.75V ~ 5.25V), and operating temperature range (0°C ~ 70°C). The suffix difference indicates manufacturing date code or internal revision, with no functional impact on circuit operation.

Q: Why does SN65LBC184DR specify only RS485 protocol while the original SN75LBC184D supports both RS422 and RS485?

A: The SN65LBC184DR datasheet lists RS485 as the primary protocol specification. Verify protocol support requirements in your application before selection. If RS422 functionality is required, choose ADM483EARZ, ADM483EARZ-REEL, SP483EEN-L/TR, or parametric equivalents that explicitly support both protocols.

Q: Can I substitute SN75LBC184D with ADM483EARZ in a 0°C to 70°C operating environment?

A: Yes. ADM483EARZ supports -40°C to 85°C operating temperature, which encompasses the 0°C to 70°C requirement. All other electrical parameters match: receiver hysteresis (70 mV), data rate (250 kbps), RS422/RS485 protocol support, and 8-SOIC package. Supply voltage range is slightly broader (4.5V ~ 5.5V vs. 4.75V ~ 5.25V), ensuring compatibility.

Q: What is receiver hysteresis and why does it matter for substitution?

A: Receiver hysteresis is the voltage difference between the rising and falling threshold levels of the input comparator. The SN75LBC184D specifies 70 mV hysteresis. Parts with different hysteresis values (such as SP3494 series at 20 mV) may exhibit different noise immunity and signal detection characteristics. For direct substitution, matching hysteresis is recommended unless circuit analysis confirms tolerance for alternative values.

Q: Is the SN75LBC184D still available for new designs?

A: No. The SN75LBC184D is in Last Time Buy status, indicating Texas Instruments has discontinued this part. New designs should select from active products: ADM483EARZ, ADM483EARZ-REEL, SP483EEN-L/TR, or parametric equivalents (ADM483JRZ, MAX483CSA+, MAX483ECSA+) to ensure long-term supply chain support.

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