SN65LBC176AP Equivalent & Substitute Parts

Part Overview

The SN65LBC176AP 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 SN65LBC176AP operates at 30 Mbps data rate with 50 mV receiver hysteresis, suitable for industrial communication applications requiring half-duplex serial transmission over twisted-pair cabling.

Key Parameters

Parameter	SN65LBC176AP
Manufacturer	Texas Instruments
Type	Transceiver Half Duplex
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Data Rate	30 Mbps
Receiver Hysteresis	50 mV
Voltage Supply	4.75V ~ 5.25V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package	8-DIP (0.300", 7.62mm)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the SN65LBC176AP is determined by the following critical parameters: RS422/RS485 protocol support, 1/1 driver/receiver configuration, half-duplex operation, 4.75V to 5.25V supply voltage range, and -40°C to 85°C operating temperature range. Package type (through-hole 8-DIP versus surface-mount 8-SOIC) determines mechanical compatibility with existing PCB layouts. Data rate and receiver hysteresis specifications define performance boundaries for signal integrity in specific applications.

Substitute parts are grouped into two categories:

Category 1: Direct Package Equivalent (8-DIP Through-Hole) Parts maintaining identical through-hole 8-DIP packaging with matching or superior electrical specifications.

Category 2: Package Alternative (8-SOIC Surface-Mount) Parts offering equivalent electrical function in surface-mount packaging for redesigned applications.

Parameter Comparison

Part Number	Manufacturer	Package	Data Rate	Receiver Hysteresis	Operating Temp	Product Status	Mounting Type
SN65LBC176AP	Texas Instruments	8-DIP	30 Mbps	50 mV	-40°C ~ 85°C	Obsolete	Through Hole
SN65LBC176ADR	Texas Instruments	8-SOIC	30 Mbps	50 mV	-40°C ~ 85°C	Active	Surface Mount
LTC1481CN8#PBF	Analog Devices Inc.	8-DIP	2.5 Mbps	45 mV	0°C ~ 70°C	Active	Through Hole
LTC1481IN8#PBF	Analog Devices Inc.	8-DIP	2.5 Mbps	45 mV	-40°C ~ 85°C	Active	Through Hole
LTC1482CN8#PBF	Analog Devices Inc.	8-DIP	4 Mbps	30 mV	0°C ~ 70°C	Active	Through Hole
LTC1483CN8#PBF	Analog Devices Inc.	8-DIP	250 kbps	45 mV	0°C ~ 70°C	Active	Through Hole
LTC1483IN8#PBF	Analog Devices Inc.	8-DIP	250 kbps	45 mV	-40°C ~ 85°C	Active	Through Hole
LTC1487CN8#PBF	Analog Devices Inc.	8-DIP	250 kbps	45 mV	0°C ~ 70°C	Active	Through Hole
MAX481CPA+	Analog Devices Inc./Maxim Integrated	8-DIP	2.5 Mbps	70 mV	0°C ~ 70°C	Active	Through Hole
MAX481ECPA+	Analog Devices Inc./Maxim Integrated	8-DIP	2.5 Mbps	70 mV	0°C ~ 70°C	Active	Through Hole
MAX481EPA+	Analog Devices Inc./Maxim Integrated	8-DIP	2.5 Mbps	70 mV	-40°C ~ 85°C	Active	Through Hole

Engineering Selection Recommendations

For Direct Replacement (Through-Hole 8-DIP Package):

LTC1481IN8#PBF and MAX481EPA+ are the primary candidates for applications requiring the full -40°C to 85°C operating temperature range with through-hole mounting. Both parts are active products with current manufacturing support and ROHS3 compliance. LTC1481IN8#PBF operates at 2.5 Mbps with 45 mV hysteresis, while MAX481EPA+ operates at 2.5 Mbps with 70 mV hysteresis. Selection depends on whether the application requires the lower hysteresis specification of the LTC1481IN8#PBF.

For applications with relaxed temperature requirements (0°C to 70°C), LTC1481CN8#PBF, LTC1482CN8#PBF, LTC1483CN8#PBF, LTC1487CN8#PBF, MAX481CPA+, and MAX481ECPA+ are available alternatives. These parts offer active product status and full manufacturing support.

For Surface-Mount Redesign (8-SOIC Package):

SN65LBC176ADR is the active equivalent from Texas Instruments, maintaining identical 30 Mbps data rate and 50 mV receiver hysteresis specifications with -40°C to 85°C operating temperature range. This part is suitable for new PCB designs requiring surface-mount technology.

Compliance Considerations:

All substitute parts listed are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. Selection should prioritize active product status to ensure long-term availability and manufacturing support.

Frequently Asked Questions (FAQ)

Q: Can LTC1481IN8#PBF directly replace SN65LBC176AP in existing designs?

A: LTC1481IN8#PBF maintains the same 8-DIP through-hole package and -40°C to 85°C operating temperature range, making it mechanically and thermally compatible. However, it operates at 2.5 Mbps versus the original 30 Mbps specification. This substitution is valid only if the application's actual data rate requirement does not exceed 2.5 Mbps.

Q: What is the difference between LTC1481CN8#PBF and LTC1481IN8#PBF?

A: Both parts are identical except for operating temperature range. LTC1481CN8#PBF operates from 0°C to 70°C, while LTC1481IN8#PBF operates from -40°C to 85°C. For applications requiring the full industrial temperature range, LTC1481IN8#PBF is required.

Q: Why does SN65LBC176ADR have different packaging than the original part?

A: SN65LBC176ADR is the active surface-mount equivalent from Texas Instruments. It provides identical electrical specifications (30 Mbps, 50 mV hysteresis, -40°C to 85°C) but in 8-SOIC surface-mount packaging. This substitution requires PCB redesign but ensures continued access to the exact electrical performance of the original part.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all substitute parts listed are ROHS3 compliant and REACH unaffected, meeting current environmental regulations.

Q: What does receiver hysteresis mean in transceiver selection?

A: Receiver hysteresis is the voltage difference between the rising and falling threshold levels of the input comparator. Higher hysteresis (70 mV in MAX481EPA+) provides greater noise immunity but slower response to small signal changes. Lower hysteresis (30 mV in LTC1482CN8#PBF) provides faster response but requires cleaner signals. The original SN65LBC176AP specifies 50 mV hysteresis as a balance between these characteristics.

Q: Can I use a lower data rate part as a substitute?

A: Yes, if your application's actual data rate requirement is lower than the substitute part's specification. For example, if your system operates at 1 Mbps, any substitute part rated at 2.5 Mbps or higher will function correctly. However, using a part rated below your required data rate will result in communication failures.

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