SN75HVD08DR RS422/RS485 Half Duplex Transceiver Equivalent & Substitute Parts

Part Overview

The SN75HVD08DR is a half-duplex RS422/RS485 transceiver manufactured by Texas Instruments in 8-SOIC surface mount packaging. This interface IC operates across a 3V to 5.5V supply range with a 10Mbps data rate capability and 35mV receiver hysteresis. The device is classified as Last Time Buy, indicating end-of-life status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support long-term product availability for applications requiring RS422/RS485 communication protocols.

Key Parameters

Parameter	SN75HVD08DR Value
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex	Half
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Voltage - Supply	3V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Receiver Hysteresis	35 mV
Data Rate	10Mbps
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SN75HVD08DR is determined by the following critical parameters:

Primary Compatibility Criteria:

Protocol: RS422/RS485 half-duplex operation
Package: 8-SOIC surface mount form factor
Number of Drivers/Receivers: 1/1 configuration
Voltage Supply Range: Must overlap or encompass 3V ~ 5.5V
Operating Temperature: Must support minimum 0°C ~ 70°C range
RoHS3 Compliance: Required for regulatory alignment

Secondary Consideration Parameters:

Receiver Hysteresis: 20mV to 70mV acceptable range
Data Rate: Minimum 10Mbps to maintain performance parity
Moisture Sensitivity Level: MSL 1 or MSL 3 acceptable

Substitute parts are grouped into two categories: direct replacements with identical or superior electrical specifications, and functional equivalents with acceptable parameter variations within engineering tolerances.

Parameter Comparison

Part Number	Manufacturer	Protocol	Voltage Supply	Operating Temp	Data Rate	Receiver Hysteresis	Package	Product Status
SN75HVD08DR	Texas Instruments	RS422, RS485	3V ~ 5.5V	0°C ~ 70°C	10Mbps	35mV	8-SOIC	Last Time Buy
SN65HVD08DR	Texas Instruments	RS422, RS485	3V ~ 5.5V	-40°C ~ 85°C	—	35mV	8-SOIC	Active
ADM4853WARZ-RL7	Analog Devices Inc.	RS422, RS485	4.75V ~ 5.25V	-40°C ~ 85°C	10Mbps	20mV	8-SOIC	Active
ISL3179EIBZ	Renesas Electronics	RS422, RS485	3V ~ 3.6V	-40°C ~ 125°C	40Mbps	28mV	8-SOIC	Active
ISL3179EIBZ-T	Renesas Electronics	RS422, RS485	3V ~ 3.6V	-40°C ~ 85°C	40Mbps	28mV	8-SOIC	Active
ISL43485IBZ	Renesas Electronics	RS422, RS485	3V ~ 3.6V	-40°C ~ 85°C	50Mbps	50mV	8-SOIC	Active
ISL43485IBZ-T	Renesas Electronics	RS422, RS485	3V ~ 3.6V	-40°C ~ 85°C	50Mbps	50mV	8-SOIC	Active
ISL4485EIBZ	Renesas Electronics	RS422, RS485	4.5V ~ 5.5V	-40°C ~ 85°C	20Mbps	70mV	8-SOIC	Obsolete
ISL83483IBZ	Renesas Electronics	RS422, RS485	3V ~ 3.6V	-40°C ~ 85°C	250kbps	50mV	8-SOIC	Active
ISL83483IBZ-T	Renesas Electronics	RS422, RS485	3V ~ 3.6V	-40°C ~ 85°C	250kbps	50mV	8-SOIC	Active
LTC1482CS8#PBF	Analog Devices Inc.	RS422, RS485	4.75V ~ 5.25V	0°C ~ 70°C	4Mbps	30mV	8-SOIC	Active

Engineering Selection Recommendations

Tier 1 - Recommended Direct Replacements (Active Status, Full Compatibility):

SN65HVD08DR from Texas Instruments is the primary recommended substitute. It maintains identical protocol support, package form factor, and voltage supply range while offering extended operating temperature range (-40°C to 85°C) and active product status. This part provides direct pin-compatible replacement capability with superior temperature performance.

ISL3179EIBZ-T and ISL43485IBZ-T from Renesas Electronics are secondary recommendations. Both devices maintain 8-SOIC packaging, RS422/RS485 protocol compliance, and active product status. These parts offer higher data rate performance (40Mbps and 50Mbps respectively) and extended temperature ranges, suitable for applications requiring enhanced bandwidth or thermal robustness.

Tier 2 - Functional Equivalents (Active Status, Parameter Variations):

ADM4853WARZ-RL7 from Analog Devices Inc. supports RS422/RS485 protocols in 8-SOIC packaging with active status. The supply voltage range (4.75V ~ 5.25V) is narrower than the original part, requiring design verification for 3V operation compatibility. This part is suitable for 5V-centric designs.

LTC1482CS8#PBF from Analog Devices Inc. maintains identical operating temperature range (0°C ~ 70°C) and 8-SOIC packaging. The supply voltage range (4.75V ~ 5.25V) and lower data rate (4Mbps) require application-specific evaluation.

Tier 3 - Not Recommended:

ISL4485EIBZ carries obsolete product status and should not be selected for new designs or long-term supply commitments.

ISL83483IBZ and ISL83483IBZ-T operate at significantly reduced data rates (250kbps) and are suitable only for low-speed communication applications, not as general-purpose replacements for the SN75HVD08DR.

Frequently Asked Questions (FAQ)

Q: Can SN65HVD08DR directly replace SN75HVD08DR without PCB modifications?

A: Yes. Both devices share identical 8-SOIC pin configuration, RS422/RS485 protocol support, and 3V ~ 5.5V supply voltage range. The SN65HVD08DR is pin-compatible and functionally equivalent, with the advantage of extended operating temperature range.

Q: What is the key difference between ISL3179EIBZ and ISL3179EIBZ-T?

A: Both parts are electrically identical with 40Mbps data rate and 3V ~ 3.6V supply range. The primary difference is packaging format: ISL3179EIBZ is supplied in Tube packaging, while ISL3179EIBZ-T is supplied in Cut Tape and Digi-Reel format. Selection depends on procurement and assembly requirements.

Q: Why do some substitute parts have narrower voltage supply ranges?

A: Devices such as ADM4853WARZ-RL7 and LTC1482CS8#PBF are optimized for 5V supply operation and specify narrower voltage ranges (4.75V ~ 5.25V) compared to the original SN75HVD08DR (3V ~ 5.5V). These parts are not suitable for 3V operation and require design verification before substitution.

Q: Is the ISL43485IBZ suitable as a replacement for high-speed applications?

A: ISL43485IBZ and ISL43485IBZ-T support 50Mbps data rates, exceeding the original 10Mbps specification. These parts are suitable for applications requiring higher bandwidth. However, the 50mV receiver hysteresis is higher than the original 35mV, which may affect noise margin in marginal signal conditions.

Q: What does "Last Time Buy" status mean for the SN75HVD08DR?

A: Last Time Buy indicates the manufacturer has announced end-of-life for this part. No new production is planned after the specified cutoff date. Existing inventory may be available, but long-term supply cannot be guaranteed. Substitution planning is necessary for designs requiring extended product lifecycle support.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this document maintain RoHS3 compliance status, ensuring regulatory alignment with current environmental and hazardous substance restrictions.

Q: Can ISL83483IBZ be used in place of SN75HVD08DR?

A: No. While ISL83483IBZ maintains 8-SOIC packaging and RS422/RS485 protocol support, its 250kbps data rate is substantially lower than the original 10Mbps specification. This part is designed for low-speed industrial communication and is not a functional equivalent for general-purpose transceiver applications.

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