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SP485EMN-L RS422/RS485 Half-Duplex Transceiver Equivalent & Substitute Parts
Part Overview
The SP485EMN-L is a half-duplex RS422/RS485 transceiver manufactured by MaxLinear, Inc., housed in an 8-SOIC surface mount package. This interface IC is designed for industrial communication applications requiring robust serial data transmission over twisted-pair cabling. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain compatibility with existing designs while meeting the same electrical and mechanical specifications.
Substiute Parts
Key Parameters
| Parameter | SP485EMN-L |
|---|---|
| Manufacturer | MaxLinear, Inc. |
| Protocol Support | RS422, RS485 |
| Configuration | 1/1 Transceiver Half-Duplex |
| Receiver Hysteresis | 20 mV |
| Data Rate | 10 Mbps |
| Supply Voltage | 4.75V ~ 5.25V |
| Operating Temperature | -40°C ~ 125°C |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | RoHS Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the SP485EMN-L is determined by the following critical parameters:
Primary Compatibility Criteria:
- Protocol: RS422/RS485 half-duplex transceiver configuration
- Driver/Receiver Count: 1/1 (single driver, single receiver)
- Package: 8-SOIC surface mount form factor
- Supply Voltage Range: 4.75V ~ 5.25V (5V operation)
- Mounting Type: Surface mount
Secondary Considerations:
- Operating temperature range (SP485EMN-L: -40°C ~ 125°C)
- Receiver hysteresis specification (SP485EMN-L: 20 mV)
- Data rate capability (SP485EMN-L: 10 Mbps)
- RoHS and regulatory compliance status
Substitute parts must maintain the same package footprint and electrical interface to ensure direct PCB compatibility. Parts with extended temperature ranges or higher data rates are acceptable as they provide equal or superior performance within the same voltage domain.
Parameter Comparison
| Part Number | Manufacturer | Protocol | Config | Supply Voltage | Temp Range | Receiver Hysteresis | Data Rate | Package | Status |
|---|---|---|---|---|---|---|---|---|---|
| SP485EMN-L | MaxLinear, Inc. | RS422, RS485 | 1/1 Half | 4.75V ~ 5.25V | -40°C ~ 125°C | 20 mV | 10 Mbps | 8-SOIC | Discontinued |
| LTC1485IS8#PBF | Analog Devices Inc. | RS422, RS485 | 1/1 Half | 4.75V ~ 5.25V | -40°C ~ 85°C | 60 mV | — | 8-SOIC | Active |
| LTC1485IS8#TRPBF | Analog Devices Inc. | RS422, RS485 | 1/1 Half | 4.75V ~ 5.25V | -40°C ~ 85°C | 60 mV | — | 8-SOIC | Active |
| ADM1485ARZ | Analog Devices Inc. | RS422, RS485 | 1/1 Half | 4.75V ~ 5.25V | -40°C ~ 85°C | 70 mV | 30 Mbps | 8-SOIC | Active |
| ADM1485ARZ-REEL | Analog Devices Inc. | RS422, RS485 | 1/1 Half | 4.75V ~ 5.25V | -40°C ~ 85°C | 70 mV | 30 Mbps | 8-SOIC | Active |
| ADM1485ARZ-REEL7 | Analog Devices Inc. | RS422, RS485 | 1/1 Half | 4.75V ~ 5.25V | -40°C ~ 85°C | 70 mV | 30 Mbps | 8-SOIC | Active |
| ADM1485JRZ | Analog Devices Inc. | RS422, RS485 | 1/1 Half | 4.75V ~ 5.25V | 0°C ~ 70°C | 70 mV | 30 Mbps | 8-SOIC | Active |
| ADM1485JRZ-REEL | Analog Devices Inc. | RS422, RS485 | 1/1 Half | 4.75V ~ 5.25V | 0°C ~ 70°C | 70 mV | 30 Mbps | 8-SOIC | Active |
| ADM3485ARZ | Analog Devices Inc. | RS422, RS485 | 1/1 Half | 3V ~ 3.6V | -40°C ~ 85°C | 50 mV | 10 Mbps | 8-SOIC | Active |
| ADM3485ARZ-REEL7 | Analog Devices Inc. | RS422, RS485 | 1/1 Half | 3V ~ 3.6V | -40°C ~ 85°C | 50 mV | 10 Mbps | 8-SOIC | Active |
| ADM3485EARZ | UMW | RS422, RS485 | 1/1 Half | 2.97V ~ 3.63V | -40°C ~ 85°C | 30 mV | 12 Mbps | 8-SOIC | Active |
Engineering Selection Recommendations
Primary Substitutes (5V Supply Domain):
The LTC1485IS8#PBF and LTC1485IS8#TRPBF are direct electrical equivalents operating within the 4.75V ~ 5.25V supply range specified for the SP485EMN-L. Both maintain RS422/RS485 half-duplex configuration with identical driver/receiver count and 8-SOIC package footprint. The LTC1485IS8#TRPBF variant is supplied on tape and reel, suitable for high-volume production environments, while the #PBF variant is supplied in tube packaging for lower-volume applications. Both are ROHS3 compliant and carry REACH Unaffected status.
The ADM1485 series (ADM1485ARZ, ADM1485ARZ-REEL, ADM1485ARZ-REEL7, ADM1485JRZ, ADM1485JRZ-REEL) operates within the same 5V supply domain and maintains full protocol compatibility. These parts offer enhanced data rate capability (30 Mbps versus 10 Mbps) and are available in multiple packaging formats. The ADM1485ARZ variants support the extended temperature range (-40°C ~ 85°C), while ADM1485JRZ variants are rated for the commercial temperature range (0°C ~ 70°C). All ADM1485 variants are ROHS3 compliant and REACH Unaffected.
Alternative Substitutes (3V Supply Domain):
The ADM3485ARZ and ADM3485ARZ-REEL7 operate at 3V ~ 3.6V supply voltage and are not direct substitutes for 5V applications. These parts are suitable only for designs where the power supply domain has been redesigned to 3V operation. The ADM3485EARZ (UMW manufacturer) operates at 2.97V ~ 3.63V and similarly requires 3V power supply compatibility.
Product Status and Compliance:
All recommended substitutes maintain Active product status with DiGi Electronics, ensuring long-term availability and supply chain stability. All parts carry ROHS3 compliance and REACH Unaffected certification, meeting current regulatory requirements for electronic component procurement.
Frequently Asked Questions (FAQ)
Q: Can I use ADM3485ARZ or ADM3485EARZ as direct replacements for SP485EMN-L?
A: No. The ADM3485 series operates at 3V ~ 3.6V supply voltage, while SP485EMN-L requires 4.75V ~ 5.25V. These parts are not electrically compatible with 5V designs without complete power supply redesign. Use only LTC1485IS8 or ADM1485 variants for 5V applications.
Q: What is the difference between ADM1485ARZ and ADM1485JRZ?
A: Both parts are electrically identical and operate within the same 5V supply range with identical data rate (30 Mbps) and hysteresis (70 mV) specifications. The primary difference is operating temperature range: ADM1485ARZ supports -40°C ~ 85°C (industrial grade), while ADM1485JRZ supports 0°C ~ 70°C (commercial grade). Select based on your application's temperature requirements.
Q: What packaging options are available for the ADM1485 series?
A: ADM1485ARZ is supplied in tube packaging. ADM1485ARZ-REEL and ADM1485ARZ-REEL7 are supplied on cut tape with Digi-Reel, suitable for automated assembly. ADM1485JRZ is supplied in tube, while ADM1485JRZ-REEL is supplied on cut tape with Digi-Reel. Select packaging based on your production volume and assembly process requirements.
Q: Are LTC1485IS8#PBF and LTC1485IS8#TRPBF functionally identical?
A: Yes. Both variants are electrically and functionally identical, operating at 4.75V ~ 5.25V with RS422/RS485 half-duplex configuration. The difference is packaging: #PBF is tube packaging, while #TRPBF is tape and reel packaging. Select based on your procurement and assembly requirements.
Q: Does the higher data rate of ADM1485 (30 Mbps) affect compatibility with SP485EMN-L designs?
A: No. The ADM1485 series' higher data rate (30 Mbps versus 10 Mbps) is a performance enhancement that does not affect backward compatibility. Designs operating at 10 Mbps will function identically with ADM1485 substitutes. The higher data rate capability provides headroom for future design iterations.
Q: What is the significance of receiver hysteresis differences between parts?
A: Receiver hysteresis affects noise immunity and signal transition characteristics. SP485EMN-L specifies 20 mV hysteresis, while LTC1485IS8 specifies 60 mV and ADM1485 specifies 70 mV. Higher hysteresis provides greater noise immunity but may increase transition time. For most industrial RS485 applications, these differences are not functionally significant. Verify hysteresis requirements against your specific noise environment if operating in high-EMI conditions.
Q: Are all recommended substitutes RoHS compliant?
A: Yes. All recommended substitutes carry ROHS3 compliance certification, meeting current environmental and regulatory requirements for electronic component procurement in regulated markets.
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