ISL4485EIBZ Equivalent & Substitute Parts

Part Overview

The ISL4485EIBZ is a half-duplex RS422/RS485 transceiver interface IC manufactured by Renesas Electronics Corporation in 8-SOIC surface mount packaging. This part is classified as obsolete, with 4,538 units currently in stock. The ISL4485EIBZ operates across a 4.5V to 5.5V supply range, supports data rates up to 20 Mbps, and maintains a receiver hysteresis of 70 mV. Due to its obsolete status, identifying equivalent and substitute parts is essential for ongoing design support, production continuity, and long-term component availability.

Key Parameters

Parameter	ISL4485EIBZ
Manufacturer	Renesas Electronics Corporation
Protocol	RS422, RS485
Type	Transceiver Half Duplex
Number of Drivers/Receivers	1/1
Data Rate	20 Mbps
Receiver Hysteresis	70 mV
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the ISL4485EIBZ 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
Operating Temperature Range: Minimum -40°C to 85°C support
Voltage Supply Range: Compatibility with 4.5V to 5.5V operation

Secondary Consideration Parameters:

Data Rate: 20 Mbps or higher
Receiver Hysteresis: 70 mV or lower (lower values provide tighter noise margins)
RoHS Compliance: ROHS3 Compliant status
Product Status: Active status preferred for long-term availability

Substitute parts are grouped into two categories: the manufacturer-recommended direct replacement (ISL3158EIBZ from Renesas) and similar alternatives from other manufacturers that meet the primary compatibility criteria while maintaining functional equivalence within specified electrical parameters.

Parameter Comparison

Parameter	ISL4485EIBZ	ISL3158EIBZ	ADM485EARZ	ADM485EARZ-REEL7	DS36277TMX/NOPB	LT1785AIS8#TRPBF	LTC2862MPS8-1#PBF
Manufacturer	Renesas	Renesas	Analog Devices	Analog Devices	Texas Instruments	Analog Devices	Analog Devices
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Protocol	RS422, RS485	RS422, RS485	RS422, RS485	RS422, RS485	RS422, RS485	RS422, RS485	RS422, RS485
Drivers/Receivers	1/1	1/1	1/1	1/1	1/1	1/1	1/1
Data Rate	20 Mbps	20 Mbps	2.5 Mbps	2.5 Mbps	—	250 kbps	20 Mbps
Receiver Hysteresis	70 mV	20 mV	70 mV	70 mV	80 mV	20 mV	150 mV
Voltage Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	3V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-55°C ~ 125°C
Package	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SO	8-SO
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Inventory Status	4,538 Pcs	2,164 Pcs	39,822 Pcs	42,600 Pcs	26,735 Pcs	79,800 Pcs	1,900 Pcs

Engineering Selection Recommendations

Direct Replacement (Manufacturer Recommended): ISL3158EIBZ is the manufacturer-recommended substitute from Renesas Electronics Corporation. This part maintains identical electrical specifications for supply voltage (4.5V ~ 5.5V), operating temperature range (-40°C ~ 85°C), data rate (20 Mbps), and 8-SOIC packaging. The ISL3158EIBZ holds active product status, ensuring long-term availability and support. The primary difference is a reduced receiver hysteresis of 20 mV compared to the original 70 mV, which provides improved noise immunity in applications with marginal signal quality. Both parts carry ROHS3 compliance and identical REACH/ECCN classifications.

Alternative Selections Based on Application Requirements:

For applications requiring maximum data rate performance with extended temperature range: LTC2862MPS8-1#PBF supports 20 Mbps operation across -55°C to 125°C, with expanded supply voltage range (3V ~ 5.5V). This part is suitable for industrial and automotive environments. The elevated receiver hysteresis of 150 mV may require signal conditioning in noisy environments.

For cost-optimized designs where data rate requirements are below 2.5 Mbps: ADM485EARZ and ADM485EARZ-REEL7 (identical electrical specifications, different packaging) provide active product status with unlimited MSL rating and high inventory availability (39,822 and 42,600 units respectively). These parts operate within the required temperature and voltage ranges but are limited to 2.5 Mbps operation.

For applications requiring lower receiver hysteresis (20 mV) with active product status: LT1785 series parts (LT1785AIS8#TRPBF, LT1785AIS8#PBF, LT1785IS8#TRPBF, LT1785IS8#PBF) provide improved noise margin performance. These parts are limited to 250 kbps data rate and narrower supply voltage range (4.75V ~ 5.25V), making them suitable for low-speed RS485 networks.

For general-purpose RS422/RS485 applications: DS36277TMX/NOPB from Texas Instruments maintains the required operating temperature range and 8-SOIC packaging with active product status. Data rate specification is not provided for this part.

Frequently Asked Questions (FAQ)

Q: Can ISL3158EIBZ directly replace ISL4485EIBZ without PCB modifications? A: Yes. Both parts use identical 8-SOIC packaging and pinout. The ISL3158EIBZ is the manufacturer-recommended direct replacement. No PCB layout changes are required. The reduced receiver hysteresis (20 mV vs. 70 mV) improves noise immunity and is functionally compatible with existing designs.

Q: What is the impact of different receiver hysteresis values on system performance? A: Receiver hysteresis determines the voltage difference between the rising and falling threshold levels. Lower hysteresis values (20 mV) provide tighter noise margins and improved signal integrity in clean environments. Higher values (70 mV, 80 mV, 150 mV) provide greater noise immunity in electrically noisy environments. Selection depends on the specific application's signal quality and noise characteristics.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts carry ROHS3 compliance status, matching the original ISL4485EIBZ. All parts are also REACH Unaffected and classified as EAR99 for export purposes.

Q: What is the difference between 8-SOIC and 8-SO packaging? A: Both designations refer to 8-pin small-outline integrated circuits with 0.154" (3.90mm) width. The terms are used interchangeably by different manufacturers. Parts specified as 8-SO are functionally equivalent to 8-SOIC for PCB placement and soldering purposes.

Q: Which substitute part offers the best long-term availability? A: LT1785IS8#TRPBF has the highest current inventory (79,800 units) and active product status. ADM485EARZ-REEL7 offers 42,600 units in stock. Both parts are manufactured by established suppliers with active product lines, ensuring continued availability.

Q: Can I use ADM485EARZ in a 20 Mbps application? A: No. ADM485EARZ is rated for maximum 2.5 Mbps operation. For applications requiring 20 Mbps performance, use ISL3158EIBZ, LTC2862MPS8-1#PBF, or DS36277TMX/NOPB.

Q: What is the MSL (Moisture Sensitivity Level) difference, and does it matter? A: ISL4485EIBZ and ISL3158EIBZ carry MSL 3 (168 hours), while all other substitutes carry MSL 1 (unlimited). MSL 1 parts have superior moisture resistance and longer shelf life without desiccant storage. For high-volume production or extended storage, MSL 1 parts are preferred.

Q: Is the ISL4485EIBZ still available for new designs? A: No. The ISL4485EIBZ is classified as obsolete. For new designs, use ISL3158EIBZ (manufacturer-recommended) or alternative active parts from the substitute list. Existing inventory (4,538 units) is available for legacy system support only.

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