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SP491ES from SIPEX

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SP491ES

Manufacturer: SIPEX, SP

Full Duplex RS-485 Transceivers

Partnumber Manufacturer Quantity Availability
SP491ES SIPEX, SP 1350 In Stock

Description and Introduction

Full Duplex RS-485 Transceivers The SP491ES is a low-power RS-485/RS-422 transceiver manufactured by SIPEX (now part of Exar Corporation). Below are its key specifications, descriptions, and features:  

### **Specifications:**  
- **Supply Voltage:** +5V  
- **Operating Temperature Range:** -40°C to +85°C  
- **Data Rate:** Up to 250 kbps  
- **Number of Drivers/Receivers:** 1 Driver, 1 Receiver  
- **ESD Protection:** ±15kV (Human Body Model)  
- **Low Power Consumption:**  
  - **Supply Current (Driver Enabled):** 1.5mA (max)  
  - **Supply Current (Shutdown Mode):** 1µA (max)  
- **Half-Duplex Operation**  
- **Compliant with:**  
  - TIA/EIA-485 (RS-485)  
  - TIA/EIA-422 (RS-422)  

### **Descriptions & Features:**  
- Designed for balanced data transmission in noisy environments.  
- Features a low-power shutdown mode for power-sensitive applications.  
- Includes thermal shutdown protection to prevent damage from excessive power dissipation.  
- Driver maintains high impedance in shutdown or with power off.  
- Receiver has a fail-safe feature ensuring a logic-high output when inputs are open or shorted.  
- Available in an 8-pin SOIC package.  

This transceiver is commonly used in industrial control, instrumentation, and point-to-point data communication systems.  

(Note: SIPEX was acquired by Exar, which was later acquired by MaxLinear.)

Application Scenarios & Design Considerations

Full Duplex RS-485 Transceivers

Alternative Part Number

  • MAX491ECP --: Pin-compatible RS-485/RS-422 transceiver with the same function and pinout, widely available and a direct drop-in replacement.
  • SN75176BP --: Industry-standard RS-485 differential bus transceiver, functionally equivalent and very cost-effective, though check duplex configuration.
  • ADM485ANZ --: Reliable RS-485 transceiver with similar electrical characteristics, good second-source option when Maxim parts are unavailable.
  • ADM491AN --: Full-duplex RS-485 transceiver functionally equivalent to the SP491 series, with similar supply voltage and interface ratings.
  • SN75180N --: Industry-standard RS-485 transceiver in a DIP package offering comparable driver/receiver performance and a well-established second source.
  • DS3695N --: Multipoint RS-485 transceiver with similar signaling capability and DIP footprint, suitable as a functional substitute when the SP491 is unavailable.

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