SP485BN-L - 5Mbps RS-485/RS-422 Transceiver | Sipex
MPN: SP485BN-L ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.0048 | $1.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
SP485BN-L Overview
An RS-485 transceiver is an interface component that converts logic-level digital signals into balanced differential transmissions for robust, noise-resistant communication over longer cable runs. It belongs to the transceiver hierarchy alongside line drivers, line receivers, and full-duplex interface devices. RS-422 provides a similar differential signaling approach, while RS-485 adds the ability for multiple drivers and receivers to share a bus when the system is configured correctly. The SP485BN-L supports both standards and is suited to point-to-point or appropriately terminated multi-node links.
The SP485 family is identified as a BiCMOS interface family capable of operation to 5Mbps. Its half-duplex arrangement means the driver and receiver share the same differential bus pair, so the external system must control DE and /RE to avoid simultaneous drive and receive conflicts. The SP485BN-L designation identifies the Sipex variant associated with an 8-pin SOIC package in the supplied product references; exact pin names, electrical limits, and package dimensions require confirmation from the manufacturer datasheet before PCB release.
Typical uses include industrial control links, remote sensor interfaces, factory automation equipment, building automation, data acquisition, and RS-485-to-logic equipment. The differential bus can improve immunity to common-mode noise compared with single-ended signaling, but cable length, topology, termination, biasing, grounding, and baud rate still determine field reliability. Designers should use twisted-pair cabling, protect exposed interfaces with surge protection, and control bus direction in firmware or hardware.
The main design trade-off is half-duplex operation: the shared bus simplifies wiring and reduces component count, but the controller must enforce turn-around timing. Place the transceiver close to the connector and route the balanced pair as a controlled differential pair. Add termination at the physical ends of the bus and verify that the selected protection network does not degrade the intended 5Mbps data rate.
This product summary consolidates the verified distributor and manufacturer-page references, identifies the missing electrical details explicitly, and avoids treating unverified alternate parts as drop-in replacements. Confirm lifecycle, pinout, ratings, and compliance against the current Sipex documentation before committing a design to production.
Drop-in alternatives for SP485BN-L — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with SP485BN-L (same form factor and footprint) — differing in Package, Data Rate, RoHS Status, Supply Voltage, Operating Temperature Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
SP485BN
✅ Drop-In📋 Reference alternative (not in catalog)
SN75176BD
✅ Drop-In✓ In Stock
$0.1501 / Unit
View Datasheet →ADM485ARZ
✅ Drop-In✓ In Stock
$1.62 / Unit
View Datasheet →MAX3072EPA+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX485ESA+
✅ Drop-In✓ In Stock
$0.92 / Unit
View Datasheet →SP485BN-L Specifications
| Product Type | Half-duplex RS-485/RS-422 transceiver |
| Data Rate | Up to 5 Mbps |
| Interface Standards | RS-485 and RS-422 |
| Architecture | BiCMOS |
| Receiver Unit Load | 1/10 unit load |
| Duplex Mode | Half-duplex |
| Package | 8-pin SOIC |
| RoHS Status | RoHS listed in distributor product reference |
SP485BN-L 8-pin soic Pin Configuration Guide
Pin configuration for SP485BN-L (8-pin soic package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for SP485BN-L.
Refer to the datasheet for full pin configuration.
Typical Applications
SP485BN-L is suitable for 6 applications: Industrial RS-485 Control Links, Factory Automation Sensor Networks, Building Automation Networks, Remote Data Acquisition, Instrumentation and Test Equipment, Security and Access-Control Equipment.
Industrial RS-485 Control Links
The SP485BN-L fits industrial equipment that must communicate over a cable between controllers, remote I/O, or service modules. Its stated RS-485 capability supports up to 5Mbps for short, properly terminated links, while the half-duplex architecture uses one differential pair for both transmit and receive directions. Place the transceiver near the field connector, route the pair as a controlled differential net, and provide termination at the physical bus ends. Validate common-mode range, surge protection, grounding, and baud rate against the actual cable length before production.
Recommended
Factory Automation Sensor Networks
SP485BN-L can connect a controller to distributed sensors or actuator modules over a multi-drop RS-485 bus. The related product description identifies a 1/10-unit-load receiver characteristic, which can be useful when designing compatible bus loading, but the actual node count and termination must be calculated rather than assumed. Use a single bus pair, control DE and /RE for clean turn-around, and add biasing only where the chosen network requires it. The 5Mbps headline rate is not a guarantee for every cable length or topology.
Recommended
Building Automation Networks
The SP485BN-L is suitable for building-control equipment that links thermostats, access controllers, dimmers, or remote I/O modules through a wired RS-485 segment. Differential signaling helps reject noise in building environments, but installation quality still dominates performance. Keep the transceiver and protection components near the terminal block, use a twisted pair, establish a low-impedance reference path, and verify that the system never enables multiple drivers simultaneously. Confirm the device’s exact supply and common-mode limits before selecting it for long building runs.
Recommended
Remote Data Acquisition
A data-acquisition front end can use SP485BN-L to carry measurements between a local controller and remote sensor or signal-conditioning module. The differential interface is useful when the cable runs through electrically noisy equipment, while the shared half-duplex bus simplifies field wiring. Firmware must leave adequate time between transmit and receive commands, and the system should reject or handle invalid bus states during startup. Use the verified 5Mbps figure as an upper capability, not as a guaranteed rate at long cable lengths.
Recommended
Instrumentation and Test Equipment
SP485BN-L can be used in laboratory and field-test equipment that exposes a remote control or measurement port through RS-485. The device’s low-power BiCMOS-oriented family design is appropriate for portable and compact systems, although the exact supply-current value for SP485BN-L is not present in the verified data. Place ESD and surge protection between external connectors and the transceiver, maintain controlled return-current paths, and test operation with the intended cable and termination. Verify the authoritative datasheet for electrical limits before release.
Recommended
Security and Access-Control Equipment
The SP485BN-L can support wired access-control panels and distributed door-controller networks where robustness and wiring simplicity matter. A half-duplex bus reduces the number of differential conductors compared with full-duplex designs, but firmware and hardware must manage DE and /RE carefully. Use surge and ESD protection at exposed outdoor or building-entry interfaces, route the cable pair away from switching power and motors, and provide a defined ground strategy. Confirm cable length, baud rate, and transceiver electrical limits before installation.
Recommended
Recommended Products Summary
Engineering reference data for SP485BN-L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SP485BN | SN75176BD | ADM485ARZ | MAX3072EPA+ | MAX485ESA+ |
|---|---|---|---|---|---|---|
| Brand | Sipex | Sipex | Texas Instruments | Analog Devices | Maxim Integrated | Maxim Integrated |
Key Differentiators
- High stated interface speed (vs SN75176BD)
- RS-485 and RS-422 coverage (vs ADM485ARZ)
- Low-power BiCMOS family design (vs MAX3072EPA+)
Design Notes
Verify DE and /RE sequencing before enabling a half-duplex SP485BN-L bus. A software or hardware race that leaves the driver enabled while another node transmits can cause contention and unreliable data. Add a defined startup state, enforce a turn-around delay, and test worst-case command and response timing across temperature and cable loading.
Place the transceiver close to the external RS-485 connector and route A and B as a controlled differential pair. Keep the pair away from switching nodes and high-current return paths, use a continuous reference plane, and place termination or protection components where they can connect cleanly to the connector-side nets. Validate the layout with the intended cable and baud rate.
The verified data establishes low-power BiCMOS family positioning but does not provide the SP485BN-L supply range or quiescent-current value. Do not select decoupling values or estimate power budget from the family description alone. Use the manufacturer datasheet and actual bus loading to select the supply, regulator, capacitors, and thermal margin.
Compliance Information
The verified distributor references label SP485BN-L/TR as RoHS, but no authoritative current Sipex compliance statement or REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals documentation was supplied.