SN75LBC176AP RS422/RS485 Half Duplex Transceiver Equivalent & Substitute Parts

Part Overview

The SN75LBC176AP 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 SN75LBC176AP operates at 30 Mbps data rate with 50 mV receiver hysteresis and is suitable for industrial communication applications requiring RS422 or RS485 protocol support.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN75LBC176AP
Manufacturer	Texas Instruments
Product Status	Obsolete
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex	Half
Data Rate	30 Mbps
Receiver Hysteresis	50 mV
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C
Mounting Type	Through Hole
Package / Case	8-DIP (0.300", 7.62mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SN75LBC176AP is determined by the following critical parameters:

Electrical Compatibility: Protocol (RS422/RS485), number of drivers/receivers (1/1), duplex mode (half), supply voltage range (4.75V ~ 5.25V), and data rate capability (minimum 30 Mbps).

Mechanical Compatibility: Package type (8-DIP through-hole) and pin configuration must match for direct board-level replacement without layout modification.

Regulatory Compliance: RoHS3 compliance and REACH unaffected status are required for equivalent substitution.

Substitute parts are grouped into three categories:

Parametric Equivalents – Same package (8-DIP), identical electrical specifications, same product status classification
MFR Recommended Alternatives – Different package options (SOIC surface mount) or upgraded specifications with active product status
Upgrade Options – Alternative manufacturers (Analog Devices, Maxim Integrated) with enhanced specifications or extended temperature ranges

Parameter Comparison

Part Number	Manufacturer	Product Status	Package	Mounting Type	Data Rate	Receiver Hysteresis	Operating Temperature	RoHS Status
SN75LBC176AP	Texas Instruments	Obsolete	8-DIP	Through Hole	30 Mbps	50 mV	0°C ~ 70°C	ROHS3
SN75LBC176P	Texas Instruments	Obsolete	8-DIP	Through Hole	30 Mbps	50 mV	0°C ~ 70°C	ROHS3
SN65LBC176ADR	Texas Instruments	Active	8-SOIC	Surface Mount	30 Mbps	50 mV	-40°C ~ 85°C	ROHS3
LTC1481IN8#PBF	Analog Devices Inc.	Active	8-DIP	Through Hole	2.5 Mbps	45 mV	-40°C ~ 85°C	ROHS3
LTC1481CN8#PBF	Analog Devices Inc.	Active	8-DIP	Through Hole	2.5 Mbps	45 mV	0°C ~ 70°C	ROHS3
LTC1482CN8#PBF	Analog Devices Inc.	Active	8-DIP	Through Hole	4 Mbps	30 mV	0°C ~ 70°C	ROHS3
LTC1482IN8#PBF	Analog Devices Inc.	Active	8-DIP	Through Hole	4 Mbps	30 mV	-40°C ~ 85°C	ROHS3
LTC1485CN8#PBF	Analog Devices Inc.	Active	8-DIP	Through Hole	Not Specified	60 mV	0°C ~ 70°C	ROHS3
MAX481CPA+	Analog Devices Inc./Maxim Integrated	Active	8-DIP	Through Hole	2.5 Mbps	70 mV	0°C ~ 70°C	ROHS3
MAX481ECPA+	Analog Devices Inc./Maxim Integrated	Active	8-DIP	Through Hole	2.5 Mbps	70 mV	0°C ~ 70°C	ROHS3
MAX481EPA+	Analog Devices Inc./Maxim Integrated	Active	8-DIP	Through Hole	2.5 Mbps	70 mV	-40°C ~ 85°C	ROHS3

Engineering Selection Recommendations

Direct Replacement (Same Package, Same Specifications): SN75LBC176P is a parametric equivalent with identical electrical performance and 8-DIP through-hole packaging. Both parts are obsolete; inventory availability should be verified before selection.

Active Product Alternatives (Through-Hole Package): Analog Devices LTC1482IN8#PBF and LTC1482CN8#PBF offer active product status with 8-DIP through-hole compatibility. These parts operate at 4 Mbps, which is lower than the original 30 Mbps specification but suitable for applications not requiring maximum data rate. Extended temperature range (-40°C ~ 85°C) is available with the LTC1482IN8#PBF variant.

Maxim Integrated MAX481EPA+ provides active product status with extended temperature range (-40°C ~ 85°C) and 8-DIP through-hole packaging, though data rate is limited to 2.5 Mbps.

Surface Mount Alternative (Active Product): Texas Instruments SN65LBC176ADR is an active product in 8-SOIC surface-mount package with identical electrical specifications (30 Mbps, 50 mV hysteresis) and extended temperature range (-40°C ~ 85°C). This option requires PCB layout modification for surface-mount implementation.

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status.

Frequently Asked Questions (FAQ)

Q: Can SN75LBC176P be used as a direct replacement for SN75LBC176AP? A: Yes. SN75LBC176P is a parametric equivalent with identical electrical specifications, receiver hysteresis, data rate, and 8-DIP through-hole package. Both parts are classified as obsolete. Verify inventory availability before committing to this option.

Q: What is the difference between the SN65LBC176ADR and SN75LBC176AP? A: The SN65LBC176ADR maintains identical electrical performance (30 Mbps, 50 mV hysteresis) and supply voltage range but uses an 8-SOIC surface-mount package instead of 8-DIP through-hole. The SN65LBC176ADR is an active product with extended operating temperature range (-40°C ~ 85°C). PCB layout modification is required for surface-mount implementation.

Q: Are Analog Devices LTC1482 series parts compatible with the SN75LBC176AP? A: LTC1482CN8#PBF and LTC1482IN8#PBF are compatible in terms of protocol (RS422/RS485), duplex mode (half), supply voltage (4.75V ~ 5.25V), and 8-DIP through-hole package. However, data rate is reduced to 4 Mbps compared to the original 30 Mbps. These parts are active products suitable for applications where maximum data rate is not required.

Q: What is the advantage of MAX481EPA+ over the original SN75LBC176AP? A: MAX481EPA+ is an active product with extended operating temperature range (-40°C ~ 85°C) compared to the original 0°C ~ 70°C range. Both maintain 8-DIP through-hole packaging and RS422/RS485 protocol support. Data rate is limited to 2.5 Mbps. This option is suitable for industrial environments requiring wider temperature operation.

Q: Can I use a surface-mount part (SN65LBC176ADR) in place of a through-hole part (SN75LBC176AP)? A: Direct board-level substitution is not possible without PCB redesign. The SN65LBC176ADR requires surface-mount pads and layout modifications. However, it offers identical electrical performance and active product status, making it suitable for new PCB designs.

Q: What does "obsolete" product status mean for the SN75LBC176AP? A: Obsolete status indicates the manufacturer has discontinued production. Existing inventory may be available through authorized distributors, but long-term supply cannot be guaranteed. For new designs or ongoing production, selection of an active product substitute is recommended.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, matching the regulatory requirements of the original SN75LBC176AP.

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