ISL4486IB RS422/RS485 Transceiver Equivalent & Substitute Parts

Part Overview

The ISL4486IB is a 1/1 full-duplex RS422/RS485 transceiver manufactured by Renesas Electronics Corporation in an 8-SOIC surface mount package. This component is classified as obsolete, with 1,679 units currently in stock. The ISL4486IB operates at 40 Mbps data rate with a 4.5V to 5.5V supply voltage range and -40°C to 85°C operating temperature. Due to its obsolete status and limited availability, identifying equivalent substitute parts with compatible electrical and mechanical specifications is essential for design continuity and long-term component sourcing.

Key Parameters

Parameter	ISL4486IB Specification
Manufacturer	Renesas Electronics Corporation
Protocol	RS422, RS485
Type	Transceiver
Number of Drivers/Receivers	1/1
Duplex	Full
Data Rate	40 Mbps
Receiver Hysteresis	40 mV
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts for the ISL4486IB are evaluated based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

Protocol support (RS422, RS485)
Number of drivers/receivers (1/1 configuration)
Package type (8-SOIC form factor)
Operating temperature range (-40°C ~ 85°C minimum)
Mounting type (Surface Mount)

Secondary Consideration Criteria:

Duplex mode (full vs. half)
Data rate capability
Supply voltage range
Receiver hysteresis
Product status and RoHS compliance

The substitute parts identified fall into two distinct groups based on duplex capability and electrical specifications. Group 1 consists of half-duplex transceivers from Analog Devices (ADM3483, ADM3485, ADM485 series) and Texas Instruments (DS36277), which share the 8-SOIC package and RS422/RS485 protocol support but operate at reduced data rates and lower supply voltages. Group 2 includes parts with different electrical characteristics but maintains core package and protocol compatibility. All identified substitutes maintain the 8-SOIC package footprint and surface mount configuration, ensuring mechanical compatibility with existing PCB designs.

Parameter Comparison

Part Number	Manufacturer	Duplex	Data Rate	Supply Voltage	Receiver Hysteresis	Operating Temp	Package	Product Status	RoHS Status
ISL4486IB	Renesas	Full	40 Mbps	4.5V ~ 5.5V	40 mV	-40°C ~ 85°C	8-SOIC	Obsolete	Non-compliant
ADM3483ARZ	Analog Devices	Half	250 kbps	3V ~ 3.6V	50 mV	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
ADM3483ARZ-REEL7	Analog Devices	Half	250 kbps	3V ~ 3.6V	50 mV	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
ADM3483EARZ	Analog Devices	Half	250 kbps	3V ~ 3.6V	50 mV	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
ADM3483EARZ-REEL7	Analog Devices	Half	250 kbps	3V ~ 3.6V	50 mV	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
ADM3485ARZ	Analog Devices	Half	10 Mbps	3V ~ 3.6V	50 mV	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
ADM3485ARZ-REEL7	Analog Devices	Half	10 Mbps	3V ~ 3.6V	50 mV	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
ADM485EARZ	Analog Devices	Half	2.5 Mbps	4.75V ~ 5.25V	70 mV	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
ADM485EARZ-REEL7	Analog Devices	Half	2.5 Mbps	4.75V ~ 5.25V	70 mV	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
DS36277TMX/NOPB	Texas Instruments	Half	Not specified	4.75V ~ 5.25V	80 mV	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
LT1785ACS8#PBF	Analog Devices	Half	250 kbps	4.75V ~ 5.25V	20 mV	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Full-Duplex Applications: No active full-duplex RS422/RS485 transceivers in 8-SOIC package are available as direct substitutes. The ISL4486IB's full-duplex capability is a distinguishing feature among the identified alternatives. Applications requiring full-duplex operation must either continue using existing ISL4486IB inventory or evaluate alternative package options from active manufacturers.

For Half-Duplex Applications with 3V Supply: The ADM3483 series (ADM3483ARZ, ADM3483EARZ, and their reel variants) from Analog Devices are active, ROHS3-compliant alternatives. These parts support 3V to 3.6V supply voltage and maintain the 8-SOIC package. Data rate is limited to 250 kbps, suitable for lower-speed RS422/RS485 networks. The ADM3485 series offers 10 Mbps capability at the same voltage range.

For Half-Duplex Applications with 5V Supply: The ADM485EARZ series and DS36277TMX/NOPB from Texas Instruments operate at 4.75V to 5.25V supply voltage, closer to the ISL4486IB's 4.5V to 5.5V range. ADM485EARZ supports 2.5 Mbps data rate. DS36277TMX/NOPB provides an alternative from Texas Instruments with 80 mV receiver hysteresis.

For Temperature-Constrained Applications: LT1785ACS8#PBF from Analog Devices operates only at 0°C to 70°C, which does not meet the full -40°C to 85°C range of the ISL4486IB. This part is suitable only for applications with reduced temperature requirements.

Compliance Considerations: All identified active substitutes are ROHS3 compliant, addressing environmental compliance requirements that the obsolete ISL4486IB does not meet. Packaging options include tube and cut tape with digi-reel configurations, with inventory availability ranging from 1,396 to 42,600 units across variants.

Frequently Asked Questions (FAQ)

Q: Can I directly replace ISL4486IB with ADM3483ARZ in my design? A: Direct replacement is not recommended without design review. While both use 8-SOIC packages and support RS422/RS485 protocols, the ADM3483ARZ is half-duplex (vs. full-duplex ISL4486IB), operates at 3V to 3.6V (vs. 4.5V to 5.5V), and supports only 250 kbps data rate (vs. 40 Mbps). Verify your application's duplex mode, supply voltage, and data rate requirements before substitution.

Q: What is the difference between ADM3483ARZ and ADM3483ARZ-REEL7? A: Both parts are electrically identical. The difference is packaging: ADM3483ARZ comes in tube packaging, while ADM3483ARZ-REEL7 comes in cut tape with digi-reel configuration. Select based on your procurement and assembly process requirements.

Q: Why are all substitutes half-duplex instead of full-duplex? A: Full-duplex RS422/RS485 transceivers in 8-SOIC packages are not currently available from active manufacturers. The ISL4486IB's full-duplex capability is a legacy feature. Applications requiring full-duplex operation must evaluate alternative package options or continue using existing ISL4486IB inventory.

Q: Is LT1785ACS8#PBF suitable for industrial applications? A: LT1785ACS8#PBF operates only at 0°C to 70°C, which does not meet industrial temperature requirements of -40°C to 85°C. This part is suitable only for commercial temperature range applications.

Q: Which substitute offers the closest electrical match to ISL4486IB? A: ADM485EARZ and DS36277TMX/NOPB operate at 4.75V to 5.25V supply voltage, closest to the ISL4486IB's 4.5V to 5.5V range. However, both are half-duplex and operate at lower data rates. ADM485EARZ supports 2.5 Mbps; DS36277TMX/NOPB data rate is not specified.

Q: Can I use a 3V supply substitute in a 5V system? A: No. ADM3483 and ADM3485 series parts rated for 3V to 3.6V supply cannot be used in 5V systems. Exceeding the maximum supply voltage rating will damage the component. Use only parts rated for your system's supply voltage range.

Q: What inventory levels are available for active substitutes? A: Inventory varies by part and packaging. ADM3483EARZ-REEL7 has the highest availability at 21,898 units. ADM485EARZ-REEL7 has 42,600 units. Verify current inventory with your supplier before committing to a design change.

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