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ISL4486IBZ Equivalent & Substitute Parts
Part Overview
The ISL4486IBZ is a 1/1 full-duplex RS422/RS485 transceiver manufactured by Renesas Electronics Corporation in 8-SOIC surface mount packaging. This component operates across a 4.5V to 5.5V supply range with a 40 Mbps data rate and 40 mV receiver hysteresis, designed for industrial communication applications requiring bidirectional signal transmission.
The ISL4486IBZ is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support long-term product availability for legacy systems and new designs requiring compatible functionality.
Substiute Parts
Key Parameters
| Parameter | ISL4486IBZ Value |
|---|---|
| Type | Transceiver |
| Protocol | RS422, RS485 |
| 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 |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the ISL4486IBZ is determined by strict alignment of the following critical parameters:
Primary Substitution Criteria:
- Package / Case: 8-SOIC (0.154", 3.90mm Width) — physical and electrical compatibility
- Protocol Support: RS422, RS485 — functional protocol requirement
- Number of Drivers/Receivers: 1/1 — channel configuration
- Operating Temperature: -40°C ~ 85°C — thermal operating range
- Mounting Type: Surface Mount — assembly compatibility
- RoHS Status: ROHS3 Compliant — regulatory compliance
Secondary Compatibility Factors:
- Duplex Mode: Full-duplex operation (ISL4486IBZ) versus half-duplex alternatives
- Data Rate: 40 Mbps (ISL4486IBZ) versus lower-speed alternatives
- Voltage Supply Range: 4.5V ~ 5.5V (ISL4486IBZ) versus 3V ~ 3.6V or 4.75V ~ 5.25V alternatives
- Receiver Hysteresis: 40 mV (ISL4486IBZ) versus alternatives ranging from 20 mV to 80 mV
The substitute parts listed below share the same 8-SOIC package, RS422/RS485 protocol support, 1/1 driver/receiver configuration, and -40°C ~ 85°C operating temperature range. However, most alternatives operate in half-duplex mode with reduced data rates and different supply voltage ranges, requiring design evaluation for specific application requirements.
Parameter Comparison
| Part Number | Manufacturer | Duplex | Data Rate | Voltage - Supply | Receiver Hysteresis | Product Status | Package |
|---|---|---|---|---|---|---|---|
| ISL4486IBZ | Renesas Electronics | Full | 40 Mbps | 4.5V ~ 5.5V | 40 mV | Obsolete | 8-SOIC |
| ADM3483ARZ | Analog Devices Inc. | Half | 250 kbps | 3V ~ 3.6V | 50 mV | Active | 8-SOIC |
| ADM3483ARZ-REEL7 | Analog Devices Inc. | Half | 250 kbps | 3V ~ 3.6V | 50 mV | Active | 8-SOIC |
| ADM3483EARZ-REEL7 | Analog Devices Inc. | Half | 250 kbps | 3V ~ 3.6V | 50 mV | Active | 8-SOIC |
| ADM3485ARZ | Analog Devices Inc. | Half | 10 Mbps | 3V ~ 3.6V | 50 mV | Active | 8-SOIC |
| ADM3485ARZ-REEL7 | Analog Devices Inc. | Half | 10 Mbps | 3V ~ 3.6V | 50 mV | Active | 8-SOIC |
| ADM3493ARZ-REEL7 | Analog Devices Inc. | Half | 250 kbps | 3V ~ 3.6V | 50 mV | Active | 8-SOIC |
| ADM485EARZ | Analog Devices Inc. | Half | 2.5 Mbps | 4.75V ~ 5.25V | 70 mV | Active | 8-SOIC |
| ADM485EARZ-REEL7 | Analog Devices Inc. | Half | 2.5 Mbps | 4.75V ~ 5.25V | 70 mV | Active | 8-SOIC |
| DS36277TMX/NOPB | Texas Instruments | Half | Not Specified | 4.75V ~ 5.25V | 80 mV | Active | 8-SOIC |
| LT1785ACS8#PBF | Analog Devices Inc. | Half | 250 kbps | 4.75V ~ 5.25V | 20 mV | Active | 8-SOIC |
Engineering Selection Recommendations
All substitute parts listed maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring regulatory and environmental compatibility with the ISL4486IBZ.
Active Product Status Advantage: All substitute parts carry active product status with Analog Devices Inc. and Texas Instruments, providing ongoing manufacturing support, availability, and technical documentation compared to the obsolete ISL4486IBZ.
Supply Voltage Compatibility: Substitutes fall into two voltage categories:
- 3V ~ 3.6V range (ADM3483, ADM3485, ADM3493 series): Requires power supply redesign for systems currently operating at 4.5V ~ 5.5V
- 4.75V ~ 5.25V range (ADM485E, DS36277, LT1785): Maintains compatibility with existing 5V supply infrastructure
Duplex Mode Consideration: The ISL4486IBZ operates in full-duplex mode, enabling simultaneous bidirectional communication. All listed substitutes operate in half-duplex mode, restricting communication to one direction at a time. Applications requiring simultaneous two-way transmission must evaluate architectural changes or seek full-duplex alternatives outside this substitute list.
Data Rate Alignment: The ISL4486IBZ supports 40 Mbps operation. Substitutes range from 250 kbps to 10 Mbps, with the ADM3485 series offering the highest rate at 10 Mbps among half-duplex options. Applications requiring the full 40 Mbps capability must assess whether reduced data rates are acceptable for system performance.
Frequently Asked Questions (FAQ)
Q: Can ADM3483ARZ or ADM3485ARZ directly replace ISL4486IBZ without circuit modifications?
A: Physical package compatibility exists (both 8-SOIC), but functional differences require evaluation. The ADM3483 and ADM3485 operate in half-duplex mode versus the ISL4486IBZ full-duplex operation. Additionally, ADM3483/ADM3485 require 3V ~ 3.6V supply versus ISL4486IBZ 4.5V ~ 5.5V, necessitating power supply circuit changes. Data rate reduction from 40 Mbps to 250 kbps or 10 Mbps must be assessed for application compatibility.
Q: What is the difference between ADM3483ARZ and ADM3483ARZ-REEL7?
A: Both parts are electrically identical with matching electrical specifications. The difference is packaging format: ADM3483ARZ is supplied in tube packaging, while ADM3483ARZ-REEL7 is supplied in cut tape with Digi-Reel format. Selection depends on assembly line equipment compatibility and procurement volume requirements.
Q: Why do most substitutes operate in half-duplex mode?
A: Half-duplex RS485 transceivers are more prevalent in industrial applications and offer cost advantages. Full-duplex operation requires separate transmit and receive signal pairs, increasing system complexity. The ISL4486IBZ full-duplex capability is a specialized feature; most modern designs use half-duplex with software-controlled direction switching.
Q: Is the ADM485EARZ suitable for 5V systems?
A: Yes. The ADM485EARZ operates within 4.75V ~ 5.25V supply range, compatible with standard 5V systems. However, it remains a half-duplex transceiver with 2.5 Mbps maximum data rate, lower than the ISL4486IBZ 40 Mbps specification.
Q: Can I use LT1785ACS8#PBF as a direct substitute?
A: The LT1785ACS8#PBF shares 8-SOIC packaging and 4.75V ~ 5.25V supply compatibility. However, it operates in half-duplex mode with 250 kbps data rate and features 20 mV receiver hysteresis (versus ISL4486IBZ 40 mV). Operating temperature range is 0°C ~ 70°C, narrower than ISL4486IBZ -40°C ~ 85°C, limiting use in extended temperature applications.
Q: What is receiver hysteresis and why does it vary among substitutes?
A: Receiver hysteresis defines the voltage difference between logic high and low thresholds, affecting noise immunity and signal integrity. ISL4486IBZ specifies 40 mV; substitutes range from 20 mV to 80 mV. Higher hysteresis improves noise rejection in electrically noisy environments; lower hysteresis allows faster signal transitions. Selection depends on application noise characteristics and timing requirements.
Q: Are all listed parts ROHS3 compliant?
A: Yes. All substitute parts listed carry ROHS3 compliance certification, meeting European Union Restriction of Hazardous Substances requirements. This ensures compatibility with modern manufacturing and environmental regulations.
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