ISL4491EIBZ Equivalent & Substitute Parts

Part Overview

The ISL4491EIBZ is a 1/1 full-duplex RS422/RS485 transceiver manufactured by Renesas Electronics Corporation in a 14-SOIC surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production support. The ISL4491EIBZ operates across a 4.5V to 5.5V supply range with a 15Mbps data rate capability and 70mV receiver hysteresis, designed for industrial communication applications requiring robust noise immunity.

Key Parameters

Parameter	ISL4491EIBZ
Manufacturer	Renesas Electronics Corporation
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex	Full
Receiver Hysteresis	70 mV
Data Rate	15 Mbps
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the ISL4491EIBZ is determined by strict alignment of the following critical parameters:

Primary Compatibility Criteria:

Protocol: RS422/RS485 full-duplex transceiver
Package: 14-SOIC form factor (0.154", 3.90mm Width)
Driver/Receiver Configuration: 1/1
Mounting Type: Surface Mount

Secondary Compatibility Criteria:

Receiver Hysteresis: 70 mV (matches ISL4491EIBZ specification)
Operating Temperature Range: -40°C to 85°C (extended industrial range)
Supply Voltage: 4.75V to 5.25V (compatible with ISL4491EIBZ nominal 5V operation)
RoHS3 Compliance

Substitute parts are grouped into two categories based on data rate capability:

Group A - High Data Rate (2.5 Mbps): MAX491 series variants with 70mV receiver hysteresis and extended temperature range support. These parts maintain the same receiver hysteresis specification as the ISL4491EIBZ.

Group B - Lower Data Rate (500 kbps): MAX3083 series variants with 100mV receiver hysteresis. These parts operate at reduced data rates and feature different receiver hysteresis characteristics.

Parameter Comparison

Part Number	Manufacturer	Protocol	Data Rate	Receiver Hysteresis	Supply Voltage	Operating Temperature	Package	Product Status
ISL4491EIBZ	Renesas Electronics	RS422, RS485	15 Mbps	70 mV	4.5V ~ 5.5V	-40°C ~ 85°C	14-SOIC	Obsolete
MAX491ESD+	Analog Devices/Maxim	RS422, RS485	2.5 Mbps	70 mV	4.75V ~ 5.25V	-40°C ~ 85°C	14-SOIC	Active
MAX491ESD+T	Analog Devices/Maxim	RS422, RS485	2.5 Mbps	70 mV	4.75V ~ 5.25V	-40°C ~ 85°C	14-SOIC	Active
MAX491ECSD+	Analog Devices/Maxim	RS422, RS485	2.5 Mbps	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	Active
MAX491ECSD+T	Analog Devices/Maxim	RS422, RS485	2.5 Mbps	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	Active
MAX491CSD+	Analog Devices/Maxim	RS422, RS485	2.5 Mbps	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	Active
MAX491CSD+T	Analog Devices/Maxim	RS422, RS485	2.5 Mbps	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	Active
MAX3083ESD+	Analog Devices/Maxim	RS422, RS485	500 kbps	100 mV	4.75V ~ 5.25V	-40°C ~ 85°C	14-SOIC	Active
MAX3083ESD+T	Analog Devices/Maxim	RS422, RS485	500 kbps	100 mV	4.75V ~ 5.25V	-40°C ~ 85°C	14-SOIC	Active
MAX3083CSD+	Analog Devices/Maxim	RS422, RS485	500 kbps	100 mV	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	Active
MAX3083CSD+T	Analog Devices/Maxim	RS422, RS485	500 kbps	100 mV	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	Active

Engineering Selection Recommendations

For Extended Temperature Range Applications (-40°C to 85°C):

MAX491ESD+ or MAX491ESD+T are the primary substitutes when operating temperature range matches the ISL4491EIBZ specification. Both variants maintain 70mV receiver hysteresis and support the full industrial temperature range. The ESD+ variant is supplied in tube packaging, while ESD+T is supplied in cut tape format. Both are active products with full RoHS3 compliance and unlimited moisture sensitivity level rating.

MAX3083ESD+ or MAX3083ESD+T provide alternative substitution with extended temperature support but operate at reduced data rates (500 kbps versus 2.5 Mbps) and feature 100mV receiver hysteresis. These are suitable only when application bandwidth requirements do not exceed 500 kbps.

For Commercial Temperature Range Applications (0°C to 70°C):

MAX491ECSD+, MAX491ECSD+T, MAX491CSD+, and MAX491CSD+T are suitable substitutes when operating temperature is limited to commercial range. All maintain 70mV receiver hysteresis and 2.5 Mbps data rate capability.

MAX3083CSD+ and MAX3083CSD+T provide lower-cost alternatives with reduced data rate capability (500 kbps) and are suitable for applications not requiring extended temperature operation.

Packaging Considerations:

Tube packaging (ESD+, ECSD+, CSD+) is appropriate for lower-volume applications and manual assembly. Cut tape and Digi-Reel formats (ESD+T, ECSD+T, CSD+T) are optimized for high-volume automated assembly processes.

All substitute parts are active products with established supply chains and RoHS3 compliance certification.

Frequently Asked Questions (FAQ)

Q: Can MAX491 series parts directly replace the ISL4491EIBZ?

A: MAX491ESD+ and MAX491ESD+T are direct functional replacements when extended temperature range (-40°C to 85°C) is required. Both maintain identical receiver hysteresis (70mV) and support the same RS422/RS485 protocols in 14-SOIC packaging. Data rate is reduced from 15 Mbps to 2.5 Mbps, which is acceptable for most industrial RS485 applications operating below 2.5 Mbps.

Q: What is the difference between MAX491ESD+ and MAX491ESD+T?

A: Both parts are electrically identical. The primary difference is packaging format: ESD+ is supplied in tube packaging suitable for manual assembly and lower volumes, while ESD+T is supplied in cut tape and Digi-Reel format optimized for automated pick-and-place assembly at higher volumes.

Q: Why do MAX3083 parts have different receiver hysteresis (100mV vs 70mV)?

A: The MAX3083 series is designed for lower data rate applications (500 kbps maximum) and uses 100mV receiver hysteresis for improved noise immunity at reduced bandwidth. The ISL4491EIBZ and MAX491 series use 70mV hysteresis optimized for higher data rates. Selection between these families depends on application bandwidth requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 compliance certification. The ISL4491EIBZ also maintains RoHS3 compliance status.

Q: What supply voltage range should I use for MAX491 substitutes?

A: MAX491 series parts operate across 4.75V to 5.25V supply range, which is narrower than the ISL4491EIBZ range of 4.5V to 5.5V. Designs using the ISL4491EIBZ at the extremes of its supply range (below 4.75V or above 5.25V) require circuit redesign to accommodate the MAX491 voltage specifications.

Q: Can I use MAX3083 parts in applications designed for ISL4491EIBZ?

A: MAX3083 parts are functionally compatible in 14-SOIC packaging and support RS422/RS485 protocols. However, the 500 kbps maximum data rate and 100mV receiver hysteresis represent significant deviations from ISL4491EIBZ specifications. Use MAX3083 only when application bandwidth is confirmed below 500 kbps and the higher receiver hysteresis is acceptable for your noise environment.

Q: What is the moisture sensitivity level (MSL) difference between ISL4491EIBZ and substitutes?

A: The ISL4491EIBZ carries MSL 3 (168 hours), while all MAX491 and MAX3083 substitutes carry MSL 1 (unlimited). MSL 1 represents superior moisture resistance and eliminates the need for bake-out procedures before reflow soldering, providing manufacturing advantages.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message