SN75176AD Equivalent & Substitute Parts

Part Overview

The SN75176AD is a half-duplex RS422/RS485 transceiver IC manufactured by Texas Instruments in an 8-SOIC surface mount package. This device is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The SN75176AD operates at 4.75V to 5.25V supply voltage with a 50 mV receiver hysteresis specification, designed for industrial communication applications requiring half-duplex serial data transmission.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN75176AD
Manufacturer	Texas Instruments
Type	Transceiver Half-Duplex
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Package / Case	8-SOIC (0.154", 3.90mm Width)
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C
Receiver Hysteresis	50 mV
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the SN75176AD is determined by the following critical parameters:

Primary Substitution Criteria:

Protocol compatibility: RS422/RS485 half-duplex operation
Package compatibility: 8-SOIC form factor
Duplex mode: Half-duplex configuration
Driver/Receiver count: 1/1 configuration
Supply voltage range: 4.75V ~ 5.25V (or compatible range)
Receiver hysteresis: 50 mV (or equivalent specification)

Direct Equivalents maintain identical electrical and mechanical specifications as the SN75176AD, differing only in packaging format (tube vs. cut tape) or minor revision designations.

Parametric Equivalents provide functionally compatible RS422/RS485 half-duplex transceiver operation in the same 8-SOIC package but may have different supply voltage ranges, operating temperature ranges, or receiver hysteresis values. These require design verification for specific application requirements.

Cross-Manufacturer Alternatives from Renesas Electronics and MaxLinear provide RS422/RS485 transceiver functionality with varying electrical specifications and operating conditions.

Parameter Comparison

Part Number	Manufacturer	Duplex	Package	Supply Voltage	Operating Temp	Receiver Hysteresis	Data Rate	Product Status
SN75176AD	Texas Instruments	Half	8-SOIC	4.75V ~ 5.25V	0°C ~ 70°C	50 mV	—	Obsolete
SN75176ADR	Texas Instruments	Half	8-SOIC	4.75V ~ 5.25V	0°C ~ 70°C	50 mV	—	Active
SN75176ADG4	Texas Instruments	Half	8-SOIC	4.75V ~ 5.25V	0°C ~ 70°C	50 mV	—	Obsolete
SN75176BD	Texas Instruments	Half	8-SOIC	4.75V ~ 5.25V	0°C ~ 70°C	50 mV	—	Obsolete
SP485CN-L	MaxLinear, Inc.	Half	8-SOIC	4.75V ~ 5.25V	0°C ~ 70°C	10 mV	5 Mbps	Active
ISL3179EIBZ	Renesas Electronics	Half	8-SOIC	3V ~ 3.6V	-40°C ~ 125°C	28 mV	40 Mbps	Active
ISL3179EIBZ-T	Renesas Electronics	Half	8-SOIC	3V ~ 3.6V	-40°C ~ 85°C	28 mV	40 Mbps	Active
ISL3180EIBZ	Renesas Electronics	Full	14-SOIC	3V ~ 3.6V	-40°C ~ 85°C	28 mV	40 Mbps	Active
ISL43485IBZ	Renesas Electronics	Half	8-SOIC	3V ~ 3.6V	-40°C ~ 85°C	50 mV	50 Mbps	Active
ISL43485IBZ-T	Renesas Electronics	Half	8-SOIC	3V ~ 3.6V	-40°C ~ 85°C	50 mV	50 Mbps	Active
ISL4485EIBZ	Renesas Electronics	Half	8-SOIC	4.5V ~ 5.5V	-40°C ~ 85°C	70 mV	20 Mbps	Obsolete

Engineering Selection Recommendations

Direct Replacement (Active Status): SN75176ADR is the primary direct replacement for SN75176AD. Both devices maintain identical electrical specifications (4.75V ~ 5.25V supply, 50 mV receiver hysteresis, 0°C ~ 70°C operating range) and 8-SOIC packaging. SN75176ADR is currently in active production status with higher inventory availability, making it the preferred choice for design continuity and production sourcing.

Texas Instruments Parametric Equivalents: SN75176ADG4 and SN75176BD provide identical electrical and mechanical specifications to SN75176AD but are classified as obsolete. These parts are suitable for legacy system repairs or applications where existing inventory is available, though SN75176ADR should be prioritized for new designs.

Active Cross-Manufacturer Alternatives: SP485CN-L (MaxLinear) maintains the same 4.75V ~ 5.25V supply voltage and 8-SOIC package as SN75176AD. This device features a lower receiver hysteresis (10 mV vs. 50 mV) and specified 5 Mbps data rate, making it suitable for applications requiring improved noise immunity and higher data rates within the same voltage domain.

ISL43485IBZ and ISL43485IBZ-T (Renesas Electronics) provide half-duplex RS422/RS485 operation in 8-SOIC packaging with 50 mV receiver hysteresis matching the SN75176AD specification. These devices operate at 3V ~ 3.6V supply voltage with extended temperature range (-40°C ~ 85°C) and 50 Mbps data rate capability. Selection requires verification that the lower supply voltage is compatible with the target application.

ISL3179EIBZ and ISL3179EIBZ-T (Renesas Electronics) offer half-duplex RS422/RS485 operation in 8-SOIC packaging with 3V ~ 3.6V supply voltage, 28 mV receiver hysteresis, and 40 Mbps data rate. Extended operating temperature range (-40°C ~ 125°C for EIBZ variant) supports industrial and automotive applications.

Not Recommended for Direct Substitution: ISL3180EIBZ differs from SN75176AD in duplex mode (full-duplex vs. half-duplex) and package size (14-SOIC vs. 8-SOIC), requiring circuit redesign and PCB layout modifications.

ISL4485EIBZ is obsolete with different supply voltage range (4.5V ~ 5.5V) and higher receiver hysteresis (70 mV), limiting its suitability for new designs.

Frequently Asked Questions (FAQ)

Q: Can SN75176ADR be used as a direct replacement for SN75176AD? A: Yes. SN75176ADR is electrically and mechanically identical to SN75176AD, differing only in packaging format (cut tape and digi-reel vs. tube). Both maintain 4.75V ~ 5.25V supply voltage, 50 mV receiver hysteresis, and 8-SOIC form factor. SN75176ADR is the recommended choice due to active production status.

Q: What is the key difference between half-duplex and full-duplex RS485 transceivers? A: Half-duplex transceivers (SN75176AD, ISL43485IBZ) allow data transmission in one direction at a time on a shared bus. Full-duplex transceivers (ISL3180EIBZ) support simultaneous bidirectional communication, requiring separate transmit and receive lines. The SN75176AD is half-duplex; full-duplex alternatives require different circuit topology.

Q: Can I use ISL43485IBZ in place of SN75176AD if my application operates at 3.3V? A: ISL43485IBZ operates at 3V ~ 3.6V supply voltage, making it compatible with 3.3V systems. However, the SN75176AD requires 4.75V ~ 5.25V. Substitution is only valid if the application power supply can be modified to support the lower voltage range. Electrical compatibility must be verified for the specific circuit design.

Q: What does receiver hysteresis mean, and why does it matter for substitution? A: Receiver hysteresis is the voltage difference between the rising and falling threshold levels of the input comparator. Higher hysteresis (50 mV for SN75176AD) provides better noise immunity on noisy bus lines. Lower hysteresis (10 mV for SP485CN-L, 28 mV for ISL3179EIBZ) allows detection of smaller signal changes. Selection depends on the noise environment and signal amplitude of the specific application.

Q: Is the 8-SOIC package the same across all substitute parts? A: Most substitutes use 8-SOIC packaging (0.154", 3.90mm width), which is mechanically compatible. ISL3180EIBZ uses 14-SOIC packaging and is not pin-compatible. Verify package designation before PCB layout to ensure correct footprint selection.

Q: What is the significance of product status (Active vs. Obsolete)? A: Active products are in current production with guaranteed long-term availability and supply. Obsolete products have been discontinued and may have limited inventory. For new designs, select active products (SN75176ADR, SP485CN-L, ISL43485IBZ, ISL3179EIBZ) to ensure production continuity and support.

Q: Can I substitute SN75176AD with a part that has a different operating temperature range? A: Operating temperature range substitution is valid only if the alternative part's range encompasses the application's actual operating conditions. SN75176AD operates 0°C ~ 70°C. ISL43485IBZ (-40°C ~ 85°C) and ISL3179EIBZ (-40°C ~ 125°C) support wider temperature ranges, making them suitable for industrial and automotive applications requiring extended temperature operation.

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