SN65176BD Equivalent & Substitute Parts

Part Overview

The SN65176BD is a half-duplex RS422/RS485 transceiver manufactured by Texas Instruments in an 8-SOIC surface mount package. This interface IC is classified as obsolete, with 2,100 units currently in stock. The part operates within a 4.75V to 5.25V supply voltage range and supports industrial temperature applications from -40°C to 105°C. Due to its obsolete status, equivalent and substitute parts are necessary for new designs, production continuity, and long-term system reliability.

Key Parameters

Parameter	SN65176BD Value
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS422, RS485
Duplex Mode	Half
Number of Drivers/Receivers	1/1
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	-40°C ~ 105°C
Receiver Hysteresis	50 mV
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the SN65176BD is determined by strict adherence to the following electrical and mechanical parameters:

Critical Compatibility Parameters:

Protocol: RS422/RS485 support required
Duplex Mode: Half-duplex operation
Driver/Receiver Configuration: 1/1 (single driver, single receiver)
Package: 8-SOIC form factor with 0.154" width (3.90mm)
Mounting: Surface mount technology
Supply Voltage Range: Minimum 4.75V to 5.25V overlap required
Receiver Hysteresis: 50 mV nominal
RoHS3 Compliance: Required for regulatory alignment

Substitute parts are grouped into two categories based on operational temperature range and data rate capabilities. Parts maintaining the original 4.75V–5.25V supply voltage window with half-duplex RS422/RS485 operation in 8-SOIC packaging are considered direct functional equivalents. Parts with extended temperature ranges or higher data rates are listed as active alternatives where supply voltage and package compatibility are maintained.

Parameter Comparison

Part Number	Manufacturer	Product Status	Duplex	Supply Voltage	Operating Temp	Receiver Hysteresis	Data Rate	Package	RoHS3
SN65176BD	Texas Instruments	Obsolete	Half	4.75V ~ 5.25V	-40°C ~ 105°C	50 mV	—	8-SOIC	Yes
DS89C21TM/NOPB	Texas Instruments	Active	Full	4.5V ~ 5.5V	-40°C ~ 85°C	50 mV	20 Mbps	8-SOIC	Yes
ADM485ARZ	UMW	Active	Half	4.75V ~ 5.25V	0°C ~ 70°C	70 mV	2.5 Mbps	8-SOIC	—
ADM485ARZ-REEL	Analog Devices Inc.	Active	Half	4.75V ~ 5.25V	-40°C ~ 85°C	70 mV	5 Mbps	8-SOIC	Yes
ADM485JRZ	Analog Devices Inc.	Active	Half	4.75V ~ 5.25V	0°C ~ 70°C	70 mV	5 Mbps	8-SOIC	Yes
ADM485JRZ-REEL	Analog Devices Inc.	Active	Half	4.75V ~ 5.25V	0°C ~ 70°C	70 mV	5 Mbps	8-SOIC	Yes
ADM485JRZ-REEL7	Analog Devices Inc.	Active	Half	4.75V ~ 5.25V	0°C ~ 70°C	70 mV	5 Mbps	8-SOIC	Yes
HI-4853PSHF	Holt Integrated Circuits Inc.	Active	Half	3.15V ~ 5.5V	-55°C ~ 175°C	—	20 Mbps	8-SOIC	Yes
ISL3179EIBZ	Renesas Electronics Corporation	Active	Half	3V ~ 3.6V	-40°C ~ 125°C	28 mV	40 Mbps	8-SOIC	Yes
ISL3179EIBZ-T	Renesas Electronics Corporation	Active	Half	3V ~ 3.6V	-40°C ~ 85°C	28 mV	40 Mbps	8-SOIC	Yes
ISL43485IBZ	Renesas Electronics Corporation	Active	Half	3V ~ 3.6V	-40°C ~ 85°C	50 mV	50 Mbps	8-SOIC	Yes

Engineering Selection Recommendations

Direct Functional Equivalents (Recommended for 5V Systems):

The ADM485ARZ-REEL, ADM485JRZ, ADM485JRZ-REEL, and ADM485JRZ-REEL7 maintain the original 4.75V–5.25V supply voltage specification and half-duplex RS422/RS485 operation in 8-SOIC packaging. All variants are active products with ROHS3 compliance. Selection between these parts depends on packaging requirements (tube versus cut tape/digi-reel) and operating temperature range. The ADM485ARZ-REEL and ADM485JRZ variants support -40°C to 85°C operation, suitable for industrial applications. The ADM485JRZ and ADM485JRZ-REEL7 variants operate from 0°C to 70°C, appropriate for commercial temperature ranges.

Extended Temperature Alternative:

The HI-4853PSHF from Holt Integrated Circuits operates across -55°C to 175°C, exceeding the original SN65176BD temperature range. This part maintains half-duplex RS422/RS485 operation in 8-SOIC packaging with ROHS3 compliance. Supply voltage range extends to 3.15V–5.5V, providing broader compatibility. Data rate capability reaches 20 Mbps.

Low-Voltage Alternatives (3V Systems):

The ISL3179EIBZ, ISL3179EIBZ-T, and ISL43485IBZ from Renesas Electronics operate at 3V–3.6V supply voltage and are not compatible with 5V systems. These parts are listed for reference in applications requiring low-voltage RS422/RS485 operation. All maintain half-duplex configuration, 8-SOIC packaging, and ROHS3 compliance. The ISL43485IBZ offers 50 mV receiver hysteresis matching the original part specification.

Full-Duplex Alternative:

The DS89C21TM/NOPB from Texas Instruments operates in full-duplex mode rather than half-duplex. This part is not a direct substitute for half-duplex applications but is listed as an active alternative where full-duplex RS422/RS485 communication is required.

Frequently Asked Questions (FAQ)

Q: Can the ADM485ARZ-REEL directly replace the SN65176BD?

A: The ADM485ARZ-REEL maintains the critical parameters for substitution: half-duplex RS422/RS485 operation, 4.75V–5.25V supply voltage, 8-SOIC package, and ROHS3 compliance. Operating temperature range is -40°C to 85°C, which covers the original -40°C to 105°C specification at the lower end. Receiver hysteresis is 70 mV versus the original 50 mV. This part is suitable for applications not requiring operation above 85°C.

Q: What is the difference between ADM485JRZ and ADM485JRZ-REEL variants?

A: Both parts are electrically identical with 4.75V–5.25V supply voltage, half-duplex RS422/RS485 operation, and 8-SOIC packaging. The primary difference is packaging format: ADM485JRZ is supplied in tube packaging, while ADM485JRZ-REEL and ADM485JRZ-REEL7 are supplied in cut tape with digi-reel format. Operating temperature range is 0°C to 70°C for both variants.

Q: Why is the DS89C21TM/NOPB listed if it is full-duplex?

A: The DS89C21TM/NOPB is included because it shares the same manufacturer (Texas Instruments), package (8-SOIC), protocol (RS422/RS485), and active product status. However, full-duplex operation differs from the original half-duplex SN65176BD. This part is suitable only for applications where full-duplex communication is required.

Q: Are the ISL3179 and ISL43485 parts compatible with 5V systems?

A: No. The ISL3179EIBZ, ISL3179EIBZ-T, and ISL43485IBZ operate at 3V–3.6V supply voltage and are not compatible with the original 4.75V–5.25V specification. These parts are listed for reference in low-voltage RS422/RS485 applications only.

Q: What is the significance of receiver hysteresis in transceiver selection?

A: Receiver hysteresis determines the voltage differential required between logic state transitions. The original SN65176BD specifies 50 mV. Most substitute parts (ADM485 series) specify 70 mV, which is acceptable for standard RS422/RS485 applications. The ISL3179 series specifies 28 mV, providing tighter threshold control. The ISL43485IBZ matches the original 50 mV specification.

Q: Can I use the HI-4853PSHF in a standard 5V application?

A: Yes. The HI-4853PSHF operates within the 3.15V–5.5V range, which encompasses the original 4.75V–5.25V specification. It maintains half-duplex RS422/RS485 operation in 8-SOIC packaging with ROHS3 compliance. The extended temperature range (-55°C to 175°C) and higher data rate (20 Mbps) make it suitable for demanding industrial applications.

Q: What packaging options are available for ADM485 substitutes?

A: The ADM485ARZ-REEL is supplied in cut tape with digi-reel packaging. The ADM485JRZ, ADM485JRZ-REEL, and ADM485JRZ-REEL7 variants offer both tube and cut tape/digi-reel options. Selection depends on assembly process requirements and volume considerations.

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