SN75LBC176P Equivalent & Substitute Parts

Part Overview

The SN75LBC176P is a half-duplex RS422/RS485 transceiver IC manufactured by Texas Instruments in an 8-DIP through-hole package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The SN75LBC176P operates within a 4.75V to 5.25V supply voltage range and supports data rates up to 30 Mbps with a receiver hysteresis of 50 mV. Substitutes must maintain functional compatibility across protocol support, electrical characteristics, and mechanical form factors.

Key Parameters

Parameter	SN75LBC176P
Manufacturer	Texas Instruments
Protocol	RS422, RS485
Type	Transceiver Half Duplex
Number of Drivers/Receivers	1/1
Receiver Hysteresis	50 mV
Data Rate	30 Mbps
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C
Mounting Type	Through Hole
Package / Case	8-DIP (0.300", 7.62mm)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the SN75LBC176P is determined by the following critical parameters:

Protocol compatibility: RS422 and RS485 support required
Electrical specifications: Supply voltage range 4.75V to 5.25V, receiver hysteresis tolerance
Data rate capability: Minimum 30 Mbps for direct replacement
Package type: 8-DIP through-hole form factor for PCB compatibility
Operating temperature range: Minimum 0°C to 70°C coverage
Duplex configuration: Half-duplex 1/1 driver/receiver architecture

Substitute parts are grouped into two categories:

Category 1 - Direct Replacements (Same Package, Full Electrical Compatibility): Parts maintaining 8-DIP through-hole packaging with 30 Mbps data rate capability and matching operating temperature range.

Category 2 - Functional Equivalents (Same Package, Extended Specifications): Parts with 8-DIP through-hole packaging that exceed minimum electrical requirements or offer extended operating temperature ranges, suitable for applications with relaxed thermal constraints.

Parameter Comparison

Part Number	Manufacturer	Protocol	Data Rate	Receiver Hysteresis	Voltage - Supply	Operating Temperature	Package	Product Status
SN75LBC176P	Texas Instruments	RS422, RS485	30 Mbps	50 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Obsolete
SN65LBC176DR	Texas Instruments	RS422, RS485	—	50 mV	4.75V ~ 5.25V	-40°C ~ 85°C	8-SOIC	Active
ADM1485ANZ	Analog Devices Inc.	RS422, RS485	30 Mbps	70 mV	4.75V ~ 5.25V	-40°C ~ 85°C	8-DIP	Active
ADM1485JNZ	Analog Devices Inc.	RS422, RS485	30 Mbps	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Active
ADM485ANZ	Analog Devices Inc.	RS422, RS485	5 Mbps	70 mV	4.75V ~ 5.25V	-40°C ~ 85°C	8-DIP	Active
ADM485JNZ	Analog Devices Inc.	RS422, RS485	5 Mbps	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Active
LTC1482CN8#PBF	Analog Devices Inc.	RS422, RS485	4 Mbps	30 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Active
LTC1482IN8#PBF	Analog Devices Inc.	RS422, RS485	4 Mbps	30 mV	4.75V ~ 5.25V	-40°C ~ 85°C	8-DIP	Active
LTC1485CN8#PBF	Analog Devices Inc.	RS422, RS485	—	60 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Active
LTC1487CN8#PBF	Analog Devices Inc.	RS422, RS485	250 kbps	45 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Active
LTC485CN8#PBF	Analog Devices Inc.	RS422, RS485	—	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Active

Engineering Selection Recommendations

For Direct Pin-Compatible Replacement (8-DIP Through-Hole, 0°C to 70°C Operating Range):

ADM1485JNZ is the primary substitute. It maintains the same 8-DIP through-hole package, supports 30 Mbps data rate, operates within the 0°C to 70°C temperature range, and holds active product status with ROHS3 compliance. The receiver hysteresis of 70 mV exceeds the original 50 mV specification, providing enhanced noise immunity.

For Extended Temperature Range Applications:

ADM1485ANZ provides the same electrical performance as ADM1485JNZ with an extended operating temperature range of -40°C to 85°C, maintaining 8-DIP through-hole packaging and active product status.

For Surface-Mount Conversion:

SN65LBC176DR, manufactured by Texas Instruments, offers the same protocol support and receiver hysteresis (50 mV) in an 8-SOIC surface-mount package. This part is suitable for PCB redesigns transitioning from through-hole to surface-mount assembly, with extended operating temperature range (-40°C to 85°C) and active product status.

For Lower Data Rate Applications:

ADM485JNZ and ADM485ANZ support 5 Mbps data rates in 8-DIP through-hole packages. These parts are suitable for applications where 30 Mbps capability is not required, offering cost optimization while maintaining protocol compatibility and ROHS3 compliance.

For Specialized Hysteresis Requirements:

LTC1482CN8#PBF and LTC1482IN8#PBF provide 30 mV receiver hysteresis (lower than the original 50 mV) with 4 Mbps data rate capability in 8-DIP packages. LTC1482IN8#PBF extends the operating temperature to -40°C to 85°C.

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original part.

Frequently Asked Questions (FAQ)

Q: Can ADM1485JNZ directly replace SN75LBC176P in existing designs?

A: Yes. ADM1485JNZ maintains the same 8-DIP through-hole package, supports RS422/RS485 protocols, operates within the 0°C to 70°C temperature range, and delivers 30 Mbps data rate capability. The 70 mV receiver hysteresis exceeds the original 50 mV specification, providing improved noise margin without affecting compatibility.

Q: What is the difference between ADM1485ANZ and ADM1485JNZ?

A: Both parts are functionally identical in electrical performance and package type. The primary difference is operating temperature range: ADM1485ANZ operates from -40°C to 85°C, while ADM1485JNZ operates from 0°C to 70°C. Select ADM1485ANZ for applications requiring extended low-temperature or high-temperature operation.

Q: Why is SN65LBC176DR listed as a substitute if it uses a different package?

A: SN65LBC176DR is a functional equivalent for applications undergoing PCB redesign from through-hole to surface-mount assembly. It maintains the same protocol support, receiver hysteresis (50 mV), and supply voltage range as the original part, with the advantage of active product status and extended operating temperature range. It is not a pin-compatible replacement.

Q: Are LTC1482 and LTC1485 series parts suitable for high-speed applications?

A: LTC1482CN8#PBF and LTC1482IN8#PBF support 4 Mbps data rates, which is below the original 30 Mbps specification. These parts are suitable for lower-speed RS422/RS485 applications. LTC1485CN8#PBF does not specify a data rate and is intended for general-purpose RS422/RS485 communication at moderate speeds.

Q: What does receiver hysteresis mean in the context of RS422/RS485 transceivers?

A: Receiver hysteresis defines the voltage difference between the rising and falling threshold levels of the receiver input. Higher hysteresis values (such as 70 mV in ADM1485 parts versus 50 mV in the original) provide greater noise immunity and reduce the risk of false triggering on noisy signal lines. Lower hysteresis values (such as 30 mV in LTC1482 parts) allow detection of smaller signal transitions but may be more susceptible to noise.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original SN75LBC176P.

Q: Can I use ADM485JNZ or ADM485ANZ as substitutes despite their lower 5 Mbps data rate?

A: ADM485 series parts are suitable only for applications where the 5 Mbps data rate is sufficient. If your application requires 30 Mbps capability, use ADM1485JNZ or ADM1485ANZ instead. Verify your system's actual data rate requirements before selecting a lower-speed alternative.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message