SN75LBC182P Equivalent & Substitute Parts

Part Overview

The SN75LBC182P is a half-duplex RS422/RS485 transceiver manufactured by Texas Instruments in 8-DIP packaging. This device is classified as Last Time Buy, indicating discontinued production. The part operates within a 4.75V to 5.25V supply range with a 250kbps data rate and 70mV receiver hysteresis, designed for industrial communication applications requiring half-duplex serial transmission.

Due to Last Time Buy status, identifying equivalent and substitute parts is essential for design continuity and long-term supply chain planning. Alternatives range from direct parametric equivalents to enhanced performance upgrades from competing manufacturers.

Key Parameters

Parameter	SN75LBC182P
Manufacturer	Texas Instruments
Protocol	RS422, RS485
Duplex Configuration	Half
Drivers/Receivers	1/1
Data Rate	250kbps
Receiver Hysteresis	70mV
Supply Voltage	4.75V – 5.25V
Operating Temperature	0°C – 70°C
Package	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict parameter matching across five critical dimensions:

Protocol Compatibility: All substitutes must support RS422 and RS485 protocols
Duplex Configuration: Half-duplex operation required
Driver/Receiver Count: 1/1 configuration mandatory
Package & Pinout: 8-DIP (0.300", 7.62mm) form factor required for direct PCB compatibility
Electrical Specifications: Supply voltage range (4.75V – 5.25V), data rate capability (minimum 250kbps), and receiver hysteresis within acceptable operating margins

Substitutes are categorized as:

Parametric Equivalents: Identical electrical specifications and temperature range
MFR Recommended: Manufacturer-approved alternatives with enhanced specifications or extended temperature ranges
Upgrade Options: Superior performance characteristics (lower hysteresis, higher data rates, extended temperature operation)

Parameter Comparison

Part Number	Manufacturer	Protocol	Duplex	Drivers/Receivers	Data Rate	Receiver Hysteresis	Supply Voltage	Operating Temperature	Package	Product Status
SN75LBC182P	Texas Instruments	RS422, RS485	Half	1/1	250kbps	70mV	4.75V – 5.25V	0°C – 70°C	8-DIP	Last Time Buy
SN65LBC182P	Texas Instruments	RS422, RS485	Half	1/1	250kbps	70mV	4.75V – 5.25V	-40°C – 85°C	8-DIP	Active
SN75LBC184P	Texas Instruments	RS422, RS485	Half	1/1	250kbps	70mV	4.75V – 5.25V	0°C – 70°C	8-DIP	Active
MAX3442EAPA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	Half	1/1	250kbps	25mV	4.75V – 5.25V	-40°C – 125°C	8-DIP	Active
MAX3442EEPA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	Half	1/1	250kbps	25mV	4.75V – 5.25V	-40°C – 85°C	8-DIP	Active
LTC1481CN8#PBF	Analog Devices Inc.	RS422, RS485	Half	1/1	2.5Mbps	45mV	4.75V – 5.25V	0°C – 70°C	8-DIP	Active
LTC1481IN8#PBF	Analog Devices Inc.	RS422, RS485	Half	1/1	2.5Mbps	45mV	4.75V – 5.25V	-40°C – 85°C	8-DIP	Active
LTC1483CN8#PBF	Analog Devices Inc.	RS422, RS485	Half	1/1	250kbps	45mV	4.75V – 5.25V	0°C – 70°C	8-DIP	Active
LTC1483IN8#PBF	Analog Devices Inc.	RS422, RS485	Half	1/1	250kbps	45mV	4.75V – 5.25V	-40°C – 85°C	8-DIP	Active
LTC1485CN8#PBF	Analog Devices Inc.	RS422, RS485	Half	1/1	Not Specified	60mV	4.75V – 5.25V	0°C – 70°C	8-DIP	Active
LTC1487CN8#PBF	Analog Devices Inc.	RS422, RS485	Half	1/1	250kbps	45mV	4.75V – 5.25V	0°C – 70°C	8-DIP	Active

Engineering Selection Recommendations

Direct Replacement (Identical Specifications)

SN65LBC182P is the primary recommended substitute. It maintains identical electrical specifications to the SN75LBC182P while offering extended operating temperature range (-40°C to 85°C) and Active product status. Both parts are Texas Instruments products with ROHS3 compliance and identical package geometry, ensuring drop-in compatibility.

SN75LBC184P provides parametric equivalence with identical temperature range (0°C – 70°C) and electrical characteristics. Active product status and 25,400 units in stock provide superior supply availability compared to the original part.

Enhanced Performance Alternatives

MAX3442EAPA+ and MAX3442EEPA+ offer superior receiver hysteresis (25mV versus 70mV), enabling improved noise immunity and signal integrity. Extended temperature operation (-40°C to 125°C for EAPA+, -40°C to 85°C for EEPA+) supports broader environmental applications. Both maintain 250kbps data rate and identical supply voltage specifications.

Higher Data Rate Options

LTC1481CN8#PBF and LTC1481IN8#PBF support 2.5Mbps data rates, providing 10x performance headroom over the original 250kbps specification. Receiver hysteresis of 45mV offers improved signal discrimination. The IN8 variant extends temperature range to -40°C to 85°C.

Standard Rate Alternatives

LTC1483CN8#PBF and LTC1483IN8#PBF maintain 250kbps data rate with 45mV receiver hysteresis and identical supply voltage. The IN8 variant provides -40°C to 85°C temperature range. Both offer 15,400 and 865 units in stock respectively.

LTC1487CN8#PBF provides 250kbps operation with 45mV hysteresis and 0°C to 70°C temperature range, with 3,528 units available.

LTC1485CN8#PBF operates at 60mV receiver hysteresis with unspecified data rate, suitable for applications where exact data rate specification is not critical.

All substitute parts maintain ROHS3 compliance and 8-DIP package compatibility.

Frequently Asked Questions (FAQ)

Q: Can SN65LBC182P directly replace SN75LBC182P?

A: Yes. SN65LBC182P is electrically identical to SN75LBC182P with matching protocol support (RS422/RS485), duplex configuration (half), driver/receiver count (1/1), data rate (250kbps), receiver hysteresis (70mV), and supply voltage (4.75V – 5.25V). The 8-DIP package ensures PCB compatibility. The primary difference is extended operating temperature range (-40°C to 85°C versus 0°C to 70°C) and Active product status.

Q: What is the difference between the LTC1481 and LTC1483 series?

A: Both series maintain identical protocol support, duplex configuration, and supply voltage. The primary distinction is data rate: LTC1481 supports 2.5Mbps while LTC1483 supports 250kbps. Receiver hysteresis is 45mV for both. Select LTC1481 for applications requiring higher bandwidth; select LTC1483 for standard 250kbps applications.

Q: Are MAX3442 variants suitable replacements?

A: MAX3442EAPA+ and MAX3442EEPA+ are suitable for applications where improved receiver hysteresis (25mV) and extended temperature operation are beneficial. Both maintain 250kbps data rate and identical supply voltage. The EAPA+ variant supports -40°C to 125°C; EEPA+ supports -40°C to 85°C. Verify application temperature requirements before selection.

Q: What does receiver hysteresis affect?

A: Receiver hysteresis determines the voltage differential required between logic state transitions. Lower hysteresis (25mV for MAX3442 versus 70mV for SN75LBC182P) provides improved noise immunity and signal discrimination in noisy environments. Higher hysteresis reduces sensitivity to noise but may require larger signal margins.

Q: Are all substitutes available in 8-DIP package?

A: Yes. All listed substitutes are packaged in 8-DIP (0.300", 7.62mm) format, ensuring mechanical and electrical compatibility with existing PCB designs. No layout modifications are required for direct substitution.

Q: Which substitute offers the best supply availability?

A: SN75LBC184P provides the highest inventory (25,400 units), followed by LTC1483CN8#PBF (15,400 units) and SN65LBC182P (10,400 units). Inventory levels support immediate procurement for production requirements.

Q: Do all substitutes maintain RoHS3 compliance?

A: Yes. All listed substitutes are ROHS3 compliant, meeting environmental and regulatory requirements identical to the original SN75LBC182P.

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