ISL8487IB RS422/RS485 Half-Duplex Transceiver Equivalent & Substitute Parts

Part Overview

The ISL8487IB is a half-duplex RS422/RS485 transceiver manufactured by Renesas Electronics Corporation in an 8-SOIC surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The ISL8487IB operates at 250 kbps data rate with a 4.5V to 5.5V supply voltage range and supports industrial temperature ranges from -40°C to 85°C. Identifying compatible alternatives ensures design continuity and supply chain flexibility.

Key Parameters

Parameter	ISL8487IB Value
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex	Half
Receiver Hysteresis	70 mV
Data Rate	250 kbps
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)
RoHS Status	RoHS non-compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the ISL8487IB are classified into two categories based on parametric equivalence:

Parametric Equivalents maintain identical electrical and mechanical specifications across all critical parameters: RS422/RS485 protocol, 1/1 driver/receiver configuration, half-duplex operation, 70 mV receiver hysteresis, 250 kbps data rate, 4.5V to 5.5V supply voltage, -40°C to 85°C operating temperature, and 8-SOIC package. These parts differ only in product status (active vs. obsolete) and RoHS compliance level.

Similar Parts share the same functional category, package, and core protocol support but may differ in one or more electrical parameters such as supply voltage range, receiver hysteresis, or data rate. These parts are suitable for applications where the parameter variation does not impact system performance.

The key parameters determining substitutability are: protocol support (RS422/RS485), duplex mode (half), driver/receiver count (1/1), package type (8-SOIC), and operating temperature range (-40°C to 85°C).

Parameter Comparison

Part Number	Manufacturer	Protocol	Data Rate	Supply Voltage	Receiver Hysteresis	Operating Temp	Package	Product Status	RoHS Status
ISL8487IB	Renesas	RS422, RS485	250 kbps	4.5V ~ 5.5V	70 mV	-40°C ~ 85°C	8-SOIC	Obsolete	RoHS non-compliant
ISL81483IBZ	Renesas	RS422, RS485	250 kbps	4.5V ~ 5.5V	70 mV	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
ISL8483EIBZ	Renesas	RS422, RS485	250 kbps	4.5V ~ 5.5V	70 mV	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
ISL8487EIBZ	Renesas	RS422, RS485	250 kbps	4.5V ~ 5.5V	70 mV	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
ADM487EARZ	Analog Devices	RS422, RS485	250 kbps	4.75V ~ 5.25V	70 mV	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
ADM487EARZ-REEL7	Analog Devices	RS422, RS485	250 kbps	4.75V ~ 5.25V	70 mV	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
MAX14780EESA+T	Analog Devices/Maxim	RS422, RS485	20 Mbps	4.5V ~ 5.5V	50 mV	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
MAX487CSA+	Analog Devices/Maxim	RS422, RS485	250 kbps	4.75V ~ 5.25V	70 mV	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant
MAX487CSA+T	Analog Devices/Maxim	RS422, RS485	250 kbps	4.75V ~ 5.25V	70 mV	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant
MAX487ECSA+	Analog Devices/Maxim	RS422, RS485	250 kbps	4.75V ~ 5.25V	70 mV	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant
MAX487ECSA+T	Analog Devices/Maxim	RS422, RS485	250 kbps	4.75V ~ 5.25V	70 mV	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalents):

ISL81483IBZ, ISL8483EIBZ, and ISL8487EIBZ are parametric equivalents manufactured by Renesas. All three maintain identical electrical specifications to the ISL8487IB while offering active product status and ROHS3 compliance. ISL8487EIBZ provides the highest inventory availability (17,593 units) and is the preferred choice for new production designs requiring the original ISL8487 base product number with modern compliance certifications.

For Supply Chain Flexibility (Similar Parts):

ADM487EARZ and ADM487EARZ-REEL7 from Analog Devices maintain 70 mV receiver hysteresis and 250 kbps data rate but operate within a narrower supply voltage range (4.75V to 5.25V). These parts are suitable for applications with regulated 5V supplies and offer high inventory availability.

MAX487 variants (CSA+, CSA+T, ECSA+, ECSA+T) from Analog Devices/Maxim Integrated support identical protocol and data rate specifications but operate within the 0°C to 70°C temperature range, making them unsuitable for industrial applications requiring -40°C operation. These parts are appropriate only for commercial temperature range applications.

MAX14780EESA+T offers significantly higher data rate capability (20 Mbps) and lower receiver hysteresis (50 mV), suitable for applications requiring enhanced performance beyond the original 250 kbps specification.

Compliance Considerations:

All active substitute parts are ROHS3 compliant, addressing environmental regulatory requirements. The original ISL8487IB is RoHS non-compliant; migration to compliant alternatives is necessary for new designs subject to RoHS directives.

Frequently Asked Questions (FAQ)

Q: Can ISL8487EIBZ directly replace ISL8487IB in existing designs?

A: Yes. ISL8487EIBZ is a parametric equivalent with identical electrical and mechanical specifications. The only differences are product status (active vs. obsolete) and RoHS compliance level. No design changes are required.

Q: What is the difference between ISL81483IBZ, ISL8483EIBZ, and ISL8487EIBZ?

A: All three are parametric equivalents with identical electrical specifications. ISL81483IBZ and ISL8483EIBZ use different base product numbers (ISL81483 and ISL8483 respectively), while ISL8487EIBZ maintains the original ISL8487 base product number. For designs originally using ISL8487IB, ISL8487EIBZ is the most direct equivalent.

Q: Can I use ADM487EARZ in place of ISL8487IB?

A: ADM487EARZ is a similar part with identical protocol, data rate, receiver hysteresis, and operating temperature range. The supply voltage range is narrower (4.75V to 5.25V vs. 4.5V to 5.5V). Use ADM487EARZ only if your application uses a regulated 5V supply within the 4.75V to 5.25V window.

Q: Are MAX487 variants suitable replacements?

A: MAX487 variants (CSA+, CSA+T, ECSA+, ECSA+T) support identical protocol and data rate but operate only within the 0°C to 70°C commercial temperature range. They are unsuitable for applications requiring -40°C operation. Use these parts only for commercial temperature applications.

Q: What is the advantage of MAX14780EESA+T?

A: MAX14780EESA+T offers 20 Mbps data rate and 50 mV receiver hysteresis, providing enhanced performance compared to the 250 kbps ISL8487IB. Use this part only if your application requires higher data rates and tighter hysteresis specifications.

Q: What packaging options are available?

A: All substitute parts use the 8-SOIC surface mount package with identical 0.154" (3.90mm) width. Packaging variations (Tube, Cut Tape, Digi-Reel) affect ordering and handling but not electrical or mechanical compatibility.

Q: Which substitute part has the best inventory availability?

A: ISL8487EIBZ offers the highest inventory (17,593 units), followed by ADM487EARZ (50,630 units) and MAX487ECSA+T (30,400 units). Inventory levels should be verified with your supplier for current availability.

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