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SP1485ECN-L Equivalent & Substitute Parts
Part Overview
The SP1485ECN-L is a half-duplex RS422/RS485 transceiver IC manufactured by MaxLinear, Inc., housed in an 8-SOIC surface mount package. This device operates at 4.75V to 5.25V supply voltage with a 20 Mbps data rate and 20 mV receiver hysteresis. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring compatible functionality.
Substiute Parts
Key Parameters
| Parameter | SP1485ECN-L |
|---|---|
| Manufacturer | MaxLinear, Inc. |
| Protocol | RS422, RS485 |
| Configuration | 1/1 Transceiver Half-Duplex |
| Package | 8-SOIC (0.154", 3.90mm Width) |
| Voltage Supply | 4.75V ~ 5.25V |
| Data Rate | 20 Mbps |
| Receiver Hysteresis | 20 mV |
| Operating Temperature | 0°C ~ 70°C |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution for the SP1485ECN-L is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:
- Protocol compatibility: RS422/RS485 half-duplex transceiver
- Package compatibility: 8-SOIC form factor
- Supply voltage range: 4.75V ~ 5.25V operation
- Data rate capability: minimum 20 Mbps
- Receiver hysteresis: acceptable range for signal integrity
- Operating temperature: minimum 0°C ~ 70°C coverage
- Mounting type: Surface mount
- Moisture sensitivity: MSL 1 (Unlimited)
Substitute parts are grouped into two categories based on voltage supply compatibility:
Category A (5V Supply): ADM1485ARZ, ADM1485ARZ-REEL, ADM1485ARZ-REEL7, ADM1485JRZ, ADM1485JRZ-REEL — These parts operate at 4.75V ~ 5.25V, matching the original supply voltage specification.
Category B (3V Supply): ADM3485ARZ, ADM3485ARZ-REEL7, ADM3485EARZ, ADM3485EARZ-REEL, ADM3485EARZ-REEL7 — These parts operate at 3V ~ 3.6V or 2.97V ~ 3.63V and are suitable only for systems designed for 3V operation.
Parameter Comparison
| Part Number | Manufacturer | Protocol | Configuration | Package | Voltage Supply | Data Rate | Receiver Hysteresis | Operating Temperature | Product Status | Packaging Type |
|---|---|---|---|---|---|---|---|---|---|---|
| SP1485ECN-L | MaxLinear, Inc. | RS422, RS485 | 1/1 Half-Duplex | 8-SOIC | 4.75V ~ 5.25V | 20 Mbps | 20 mV | 0°C ~ 70°C | Obsolete | — |
| ADM1485ARZ | Analog Devices Inc. | RS422, RS485 | 1/1 Half-Duplex | 8-SOIC | 4.75V ~ 5.25V | 30 Mbps | 70 mV | -40°C ~ 85°C | Active | Tube |
| ADM1485ARZ-REEL | Analog Devices Inc. | RS422, RS485 | 1/1 Half-Duplex | 8-SOIC | 4.75V ~ 5.25V | 30 Mbps | 70 mV | -40°C ~ 85°C | Active | Cut Tape & Digi-Reel |
| ADM1485ARZ-REEL7 | Analog Devices Inc. | RS422, RS485 | 1/1 Half-Duplex | 8-SOIC | 4.75V ~ 5.25V | 30 Mbps | 70 mV | -40°C ~ 85°C | Active | Cut Tape & Digi-Reel |
| ADM1485JRZ | Analog Devices Inc. | RS422, RS485 | 1/1 Half-Duplex | 8-SOIC | 4.75V ~ 5.25V | 30 Mbps | 70 mV | 0°C ~ 70°C | Active | Tube |
| ADM1485JRZ-REEL | Analog Devices Inc. | RS422, RS485 | 1/1 Half-Duplex | 8-SOIC | 4.75V ~ 5.25V | 30 Mbps | 70 mV | 0°C ~ 70°C | Active | Cut Tape & Digi-Reel |
| ADM3485ARZ | Analog Devices Inc. | RS422, RS485 | 1/1 Half-Duplex | 8-SOIC | 3V ~ 3.6V | 10 Mbps | 50 mV | -40°C ~ 85°C | Active | Tube |
| ADM3485ARZ-REEL7 | Analog Devices Inc. | RS422, RS485 | 1/1 Half-Duplex | 8-SOIC | 3V ~ 3.6V | 10 Mbps | 50 mV | -40°C ~ 85°C | Active | Cut Tape & Digi-Reel |
| ADM3485EARZ | UMW | RS422, RS485 | 1/1 Half-Duplex | 8-SOIC | 2.97V ~ 3.63V | 12 Mbps | 30 mV | -40°C ~ 85°C | Active | Cut Tape & Digi-Reel |
| ADM3485EARZ-REEL | Analog Devices Inc. | RS422, RS485 | 1/1 Half-Duplex | 8-SOIC | 3V ~ 3.6V | 10 Mbps | 50 mV | -40°C ~ 85°C | Active | Cut Tape & Digi-Reel |
| ADM3485EARZ-REEL7 | Analog Devices Inc. | RS422, RS485 | 1/1 Half-Duplex | 8-SOIC | 3V ~ 3.6V | 10 Mbps | 50 mV | -40°C ~ 85°C | Active | Cut Tape & Digi-Reel |
Engineering Selection Recommendations
For direct replacement of SP1485ECN-L in 5V systems, select from the ADM1485 series (ADM1485ARZ, ADM1485ARZ-REEL, ADM1485ARZ-REEL7, ADM1485JRZ, ADM1485JRZ-REEL). These parts maintain 4.75V ~ 5.25V supply voltage compatibility and exceed the original 20 Mbps data rate specification at 30 Mbps. All ADM1485 variants are active products with ROHS3 compliance and MSL 1 rating.
For temperature-constrained applications matching the original 0°C ~ 70°C range, ADM1485JRZ and ADM1485JRZ-REEL are direct functional equivalents. For extended temperature operation (-40°C ~ 85°C), ADM1485ARZ variants are suitable.
The ADM3485 series (ADM3485ARZ, ADM3485ARZ-REEL7, ADM3485EARZ, ADM3485EARZ-REEL, ADM3485EARZ-REEL7) operates at 3V supply voltage and is applicable only to systems redesigned for 3V operation. These parts are not suitable as direct replacements in 5V circuits.
All substitute parts are active products with ROHS3 compliance and unlimited moisture sensitivity rating, supporting long-term supply continuity.
Frequently Asked Questions (FAQ)
Q: Can ADM3485 series parts replace SP1485ECN-L in existing 5V designs?
A: No. ADM3485 series parts operate at 3V ~ 3.6V supply voltage, incompatible with the SP1485ECN-L specification of 4.75V ~ 5.25V. Use ADM1485 series for 5V applications.
Q: What is the difference between ADM1485ARZ and ADM1485JRZ?
A: Both operate at 4.75V ~ 5.25V with 30 Mbps data rate and 70 mV receiver hysteresis. The difference is operating temperature: ADM1485ARZ covers -40°C ~ 85°C, while ADM1485JRZ covers 0°C ~ 70°C, matching the original SP1485ECN-L temperature range.
Q: Are packaging variants (Tube, Cut Tape, Digi-Reel) electrically equivalent?
A: Yes. Packaging variants of the same part number (e.g., ADM1485ARZ, ADM1485ARZ-REEL, ADM1485ARZ-REEL7) are electrically identical. The suffix indicates only the shipping and handling format.
Q: Does the higher data rate of ADM1485 (30 Mbps vs. 20 Mbps) affect compatibility?
A: No. Higher data rate capability is backward compatible. Systems designed for 20 Mbps operation function correctly with 30 Mbps-capable parts.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All active substitute parts listed (ADM1485 and ADM3485 series) are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.
Q: What is the receiver hysteresis difference between SP1485ECN-L (20 mV) and ADM1485 (70 mV)?
A: Receiver hysteresis affects noise immunity. The ADM1485 series provides higher hysteresis (70 mV), improving noise rejection compared to the original 20 mV specification. This is a functional improvement for signal integrity.
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