SN65ALS1176P Equivalent & Substitute Parts

Part Overview

The SN65ALS1176P is a half-duplex RS422/RS485 transceiver manufactured by Texas Instruments in an 8-DIP package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The SN65ALS1176P operates as a 1/1 transceiver (one driver, one receiver) and is suitable for industrial communication applications requiring half-duplex serial data transmission.

Key Parameters

Parameter	SN65ALS1176P
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS422, RS485
Configuration	1/1 Half-Duplex
Receiver Hysteresis	60 mV
Data Rate	35 Mbps
Supply Voltage	4.75V – 5.25V
Operating Temperature	-25°C – 85°C
Package	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SN65ALS1176P is determined by the following critical parameters:

Package Compatibility: All substitutes must use 8-DIP (0.300", 7.62mm) through-hole packaging
Protocol Support: All substitutes must support RS422 and RS485 protocols
Configuration: All substitutes must be 1/1 half-duplex transceivers
Electrical Compatibility: Supply voltage range, operating temperature range, and receiver hysteresis determine functional equivalence
Compliance: RoHS3 compliance and MSL rating must be maintained

Substitute parts are grouped into two categories based on electrical performance:

Category A – High-Speed Equivalents (≥2.5 Mbps data rate): ISL81487EIPZ, MAX1487EPA+, MAX481EPA+, MAX485CPA+. These parts support higher data rates than the original part and are suitable for applications requiring extended bandwidth.

Category B – Standard-Speed Equivalents (≤250 kbps data rate): LT1785 series (ACN8, AIN8, CN8, IN8) and LTC485 series (CN8, IN8). These parts operate at lower data rates and are suitable for legacy systems and applications with reduced bandwidth requirements.

Parameter Comparison

Part Number	Manufacturer	Data Rate	Receiver Hysteresis	Supply Voltage	Operating Temperature	Product Status	Inventory
SN65ALS1176P	Texas Instruments	35 Mbps	60 mV	4.75V – 5.25V	-25°C – 85°C	Obsolete	3800 Pcs
ISL81487EIPZ	Renesas Electronics	5 Mbps	70 mV	4.5V – 5.5V	-40°C – 85°C	Active	2007 Pcs
LT1785ACN8#PBF	Analog Devices Inc.	250 kbps	20 mV	4.75V – 5.25V	0°C – 70°C	Active	2332 Pcs
LT1785AIN8#PBF	Analog Devices Inc.	250 kbps	20 mV	4.75V – 5.25V	-40°C – 85°C	Active	3600 Pcs
LT1785CN8#PBF	Analog Devices Inc.	250 kbps	20 mV	4.75V – 5.25V	0°C – 70°C	Active	3411 Pcs
LT1785IN8#PBF	Analog Devices Inc.	250 kbps	20 mV	4.75V – 5.25V	-40°C – 85°C	Active	2216 Pcs
LTC485CN8#PBF	Analog Devices Inc.	Not specified	70 mV	4.75V – 5.25V	0°C – 70°C	Active	3155 Pcs
LTC485IN8#PBF	Analog Devices Inc.	Not specified	70 mV	4.75V – 5.25V	-40°C – 85°C	Active	3555 Pcs
MAX1487EPA+	Analog Devices Inc./Maxim Integrated	2.5 Mbps	70 mV	4.75V – 5.25V	-40°C – 85°C	Active	4463 Pcs
MAX481EPA+	Analog Devices Inc./Maxim Integrated	2.5 Mbps	70 mV	4.75V – 5.25V	-40°C – 85°C	Active	4320 Pcs
MAX485CPA+	Analog Devices Inc./Maxim Integrated	2.5 Mbps	70 mV	4.75V – 5.25V	0°C – 70°C	Active	3179 Pcs

Engineering Selection Recommendations

For Extended Temperature Range Applications (-40°C to 85°C): Select LT1785AIN8#PBF, LT1785IN8#PBF, MAX1487EPA+, or MAX481EPA+. These parts maintain active product status and support the full temperature range of the original SN65ALS1176P.

For Standard Temperature Range Applications (0°C to 70°C): LT1785ACN8#PBF, LT1785CN8#PBF, LTC485CN8#PBF, and MAX485CPA+ are suitable alternatives with active product status.

For High-Speed Applications (≥2.5 Mbps): ISL81487EIPZ, MAX1487EPA+, MAX481EPA+, and MAX485CPA+ support data rates significantly higher than the original part and are recommended for bandwidth-intensive applications.

For Legacy System Compatibility: LT1785 and LTC485 series parts maintain identical supply voltage specifications (4.75V – 5.25V) and package form factor, ensuring direct board-level compatibility with existing designs.

All substitute parts maintain ROHS3 compliance and MSL rating 1 (Unlimited), meeting regulatory and environmental requirements equivalent to the original part.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a different data rate than the SN65ALS1176P? A: Yes. The SN65ALS1176P operates at 35 Mbps, but substitute parts with lower data rates (2.5 Mbps, 5 Mbps, or 250 kbps) are functionally compatible for applications that do not require the full bandwidth of the original part. Higher data rate capability does not affect operation at lower speeds.

Q: What is the difference between LT1785 and LTC485 series parts? A: Both series are RS422/RS485 half-duplex transceivers in 8-DIP packages. The primary difference is receiver hysteresis: LT1785 parts have 20 mV hysteresis, while LTC485 parts have 70 mV hysteresis. LT1785 parts also specify a 250 kbps data rate, whereas LTC485 data rate is not specified in the provided documentation.

Q: Which substitute part has the closest electrical match to the SN65ALS1176P? A: ISL81487EIPZ provides the closest match with 5 Mbps data rate and 70 mV receiver hysteresis, though it operates at a lower speed than the original 35 Mbps specification. For applications requiring the original speed capability, no direct equivalent is available among the listed substitutes.

Q: Are all substitute parts available in the same 8-DIP package? A: Yes. All substitute parts listed use 8-DIP (0.300", 7.62mm) through-hole packaging, ensuring mechanical and pin compatibility with the original SN65ALS1176P.

Q: Do substitute parts support both RS422 and RS485 protocols? A: Yes. All substitute parts support both RS422 and RS485 protocols, maintaining protocol compatibility with the original part.

Q: What is the temperature rating difference between LT1785ACN8#PBF and LT1785AIN8#PBF? A: LT1785ACN8#PBF operates from 0°C to 70°C (commercial grade), while LT1785AIN8#PBF operates from -40°C to 85°C (industrial grade). Both parts are otherwise electrically identical. Select the industrial grade variant for applications requiring extended temperature range operation.

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