ISL83085EIB RS422/RS485 Half-Duplex Transceiver Equivalent & Substitute Parts

Part Overview

The ISL83085EIB is a half-duplex RS422/RS485 transceiver manufactured by Renesas Electronics Corporation in 8-SOIC surface mount packaging. This part is classified as obsolete, with 844 units currently in stock. The ISL83085EIB operates across a 4.5V to 5.5V supply range with a 500kbps data rate and supports industrial temperature ranges from -40°C to 85°C. Due to its obsolete status and non-RoHS3 compliance, identifying equivalent and substitute parts is necessary for new designs and long-term supply chain planning.

Key Parameters

Parameter	ISL83085EIB Specification
Manufacturer	Renesas Electronics Corporation
Protocol	RS422, RS485
Type	Transceiver Half-Duplex
Number of Drivers/Receivers	1/1
Receiver Hysteresis	20 mV
Data Rate	500kbps
Voltage Supply Range	4.5V – 5.5V
Operating Temperature	-40°C to 85°C
Package/Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	Non-compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the ISL83085EIB is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Protocol compatibility: RS422/RS485 half-duplex operation
Driver/Receiver configuration: 1/1 topology
Package type: 8-SOIC form factor
Supply voltage range: Must encompass or match 4.5V–5.5V
Operating temperature range: Must support -40°C to 85°C minimum
Data rate capability: Minimum 500kbps

Substitution Categories:

Parametric Equivalent: ISL83085EIBZ matches all electrical specifications of the main part while offering improved product status (Active) and RoHS3 compliance. Identical receiver hysteresis (20 mV) and data rate (500kbps).

Direct Manufacturer Substitutes: ADM1487EARZ and SP3085EEN-L provide functional equivalence with identical 1/1 transceiver configuration, 8-SOIC packaging, and full temperature range support. Both are active products with RoHS3 compliance.

Similar Substitutes: MAX14780EESA+T, MAX3085 series variants (CSA+, CSA+T, ECSA+, ECSA+T, EESA+, EESA+T), and MAX3085EESA+ offer compatible RS422/RS485 half-duplex operation in 8-SOIC packaging with enhanced data rates and receiver hysteresis specifications. Temperature range and supply voltage variations exist within this group.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Receiver Hysteresis	Data Rate	Supply Voltage	Operating Temp	Package	Product Status	RoHS Status
ISL83085EIB	Renesas	RS422/RS485	1/1	20 mV	500kbps	4.5V–5.5V	-40°C to 85°C	8-SOIC	Obsolete	Non-compliant
ISL83085EIBZ	Renesas	RS422/RS485	1/1	20 mV	500kbps	4.5V–5.5V	-40°C to 85°C	8-SOIC	Active	RoHS3 Compliant
ADM1487EARZ	Analog Devices	RS422/RS485	1/1	70 mV	2.5Mbps	4.75V–5.25V	-40°C to 85°C	8-SOIC	Active	RoHS3 Compliant
SP3085EEN-L	MaxLinear	RS422/RS485	1/1	100 mV	500kbps	4.5V–5.5V	-40°C to 85°C	8-SOIC	Active	RoHS3 Compliant
MAX14780EESA+T	Analog Devices/Maxim	RS422/RS485	1/1	50 mV	20Mbps	4.5V–5.5V	-40°C to 85°C	8-SOIC	Active	RoHS3 Compliant
MAX3085CSA+T	Analog Devices/Maxim	RS422/RS485	1/1	100 mV	500kbps	4.75V–5.25V	0°C to 70°C	8-SOIC	Active	RoHS3 Compliant
MAX3085EESA+T	Analog Devices/Maxim	RS422/RS485	1/1	100 mV	500kbps	4.75V–5.25V	-40°C to 85°C	8-SOIC	Active	RoHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Preferred): ISL83085EIBZ is the optimal choice, offering identical electrical performance to the ISL83085EIB while providing active product status and RoHS3 compliance. This part maintains the same 20 mV receiver hysteresis and 500kbps data rate, ensuring pin-for-pin and functional compatibility.

For Active Supply Chain: ADM1487EARZ and SP3085EEN-L are both active products with RoHS3 compliance and full -40°C to 85°C temperature range support. ADM1487EARZ offers enhanced data rate capability (2.5Mbps) with slightly narrower supply voltage tolerance (4.75V–5.25V). SP3085EEN-L maintains the 4.5V–5.5V supply range with 100 mV receiver hysteresis.

For Extended Performance Requirements: MAX14780EESA+T provides significantly higher data rate capability (20Mbps) while maintaining the full -40°C to 85°C temperature range and 4.5V–5.5V supply voltage compatibility. This part is suitable for applications requiring higher bandwidth within the same form factor.

For Industrial Temperature Range with Extended Supply: MAX3085EESA+T variants support the full -40°C to 85°C operating range with 4.75V–5.25V supply voltage. These parts are available in multiple packaging options (Tube, Tape & Reel, Cut Tape & Digi-Reel) with high inventory availability.

Compliance Consideration: All recommended substitutes are RoHS3 compliant and REACH unaffected, addressing regulatory requirements that the obsolete ISL83085EIB does not meet.

Frequently Asked Questions (FAQ)

Q: Can ISL83085EIBZ be used as a direct replacement for ISL83085EIB? A: Yes. ISL83085EIBZ is a parametric equivalent with identical electrical specifications (20 mV receiver hysteresis, 500kbps data rate, 4.5V–5.5V supply, -40°C to 85°C operating range) and 8-SOIC packaging. The primary differences are product status (Active vs. Obsolete) and RoHS compliance (RoHS3 vs. Non-compliant).

Q: What is the key difference between ADM1487EARZ and SP3085EEN-L? A: Both are active RS422/RS485 half-duplex transceivers in 8-SOIC packaging with -40°C to 85°C temperature support. ADM1487EARZ offers higher data rate (2.5Mbps vs. 500kbps) and higher receiver hysteresis (70 mV vs. 100 mV), with a narrower supply voltage range (4.75V–5.25V vs. 4.5V–5.5V). SP3085EEN-L maintains the original supply voltage range of the ISL83085EIB.

Q: Why do MAX3085 variants show different operating temperature ranges? A: MAX3085 series parts are available in multiple temperature grades. MAX3085CSA+ and MAX3085ECSA+ variants are rated 0°C to 70°C (commercial grade), while MAX3085EESA+ variants are rated -40°C to 85°C (industrial grade). Select the temperature grade matching your application requirements.

Q: Is MAX14780EESA+T compatible with ISL83085EIB applications? A: MAX14780EESA+T is functionally compatible in terms of RS422/RS485 half-duplex operation, 1/1 driver/receiver configuration, 8-SOIC packaging, and -40°C to 85°C temperature range. However, its 20Mbps data rate significantly exceeds the 500kbps requirement of ISL83085EIB. This part is suitable for applications requiring higher bandwidth within the same form factor and temperature range.

Q: What packaging options are available for substitute parts? A: Substitute parts are available in Tube, Tape & Reel (TR), and Cut Tape & Digi-Reel packaging. ISL83085EIBZ is supplied in Tube packaging. ADM1487EARZ and SP3085EEN-L are supplied in Tube. MAX3085 series variants are available in multiple packaging formats to support different manufacturing processes and volume requirements.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All recommended substitute parts (ISL83085EIBZ, ADM1487EARZ, SP3085EEN-L, MAX14780EESA+T, and MAX3085 series variants) are RoHS3 compliant. The original ISL83085EIB is non-compliant, making substitution necessary for new designs subject to RoHS regulations.

Q: Can I use a substitute part with a narrower supply voltage range than ISL83085EIB? A: Substitution is possible only if your application supply voltage falls within the substitute part's specified range. ISL83085EIB operates 4.5V–5.5V. ADM1487EARZ operates 4.75V–5.25V (narrower range). MAX3085 variants operate 4.75V–5.25V. Verify your supply voltage specification before selecting a substitute with a narrower range.

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