SN65HVD50D - 25Mbps RS-485/RS-422 Transceiver | Texas Instruments
MPN: SN65HVD50D ✓ ActiveSN65HVD50D Overview
An RS-485 transceiver is an interface IC that converts logic-level signals into differential bus voltages and receives differential bus signals back into logic-level outputs. This product belongs to the broader RS-485 transceiver family, which is part of the interface IC category and supports industrial, telecommunications, building automation, instrumentation, and data-communication equipment. The SN65HVD50D is appropriate where a system requires a dedicated full-duplex RS-485 or RS-422 interface rather than a half-duplex transceiver.
Key features include 1/8 unit-load operation for networks containing as many as 256 nodes, bus-pin ESD protection exceeding 15 kV HBM, and a low-current standby mode with 1 µA typical standby current. The receiver provides 50 mV hysteresis, which helps improve noise immunity during differential signaling. The 25 Mbps maximum data rate makes the device suitable for high-speed data links where cable length and topology must be considered carefully.
The SN65HVD50D is a single-channel transceiver with separate transmit and receive paths, allowing full-duplex communication. Its high-output driver is intended for driving differential cables and interconnects while maintaining robust signal margins. The manufacturer product page identifies the device as a High Output Full-Duplex RS 485 Driver and Receiver, while distributor listings identify the package as 8-SOIC and describe it as an RS-422/RS-485 interface IC.
Typical applications include industrial control networks, factory automation equipment, instrumentation systems, building-control networks, and high-speed industrial data links. When selecting it, engineers should verify cable length, node count, termination, common-mode range, grounding, and connector requirements against the complete manufacturer datasheet before layout release.
A practical design consideration is that the driver transition-time setting affects edge rate and therefore can influence EMI behavior. Keep the differential pair routed with controlled geometry, provide the required bus protection and termination, and validate the complete board-level signal integrity at the selected data rate. This page combines manufacturer and distributor information with application guidance, comparison criteria, and drop-in replacement findings to support faster engineering evaluation.
Drop-in alternatives for SN65HVD50D — 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 SN65HVD50D (same form factor and footprint) — differing in Maximum Bus Nodes, Operating Temperature Range, Package, Product Type, Standby Current.
SN65HVD50DG4
✅ Drop-In📋 Reference alternative (not in catalog)
SN65HVD50DRG4
✅ Drop-In📋 Reference alternative (not in catalog)
SN65HVD50D Specifications
| Product Type | High-output full-duplex RS-485 driver and receiver |
| Supported Standards | RS-485 and RS-422 |
| Supply Voltage Range | 4.5 V to 5.5 V |
| Maximum Data Rate | 25 Mbps |
| Number of Drivers | 1 |
| Number of Receivers | 1 |
| Receiver Hysteresis | 50 mV |
| Unit Load | 1/8 unit load |
| Maximum Bus Nodes | 256 nodes |
| Bus-Pin ESD Protection | Exceeds 15 kV HBM |
| Standby Current | 1 µA |
| Driver Transition-Time Options | 1 Mbps, 5 Mbps, and 25 Mbps |
| Operating Temperature Range | -40 °C to +85 °C |
| Package | 8-pin SOIC (D), 0.154 inch body width, 3.90 mm width |
| Mounting Type | Surface mount |
| Manufacturer Product Description | High Output Full-Duplex RS 485 Drivers and Receivers |
SN65HVD50D 8-pin soic (d), 0.154 inch body width, 3.90 mm width Pin Configuration Guide
Pin configuration for SN65HVD50D (8-pin soic (d), 0.154 inch body width, 3.90 mm width 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 SN65HVD50D.
Refer to the datasheet for full pin configuration.
Typical Applications
SN65HVD50D is suitable for 6 applications: Industrial Control Networks, Factory Automation Equipment, Building Automation Systems, High-Speed Data Communication Links, Test and Measurement Instruments, Telecommunications Equipment.
Industrial Control Networks
The SN65HVD50D suits industrial control links that require a high-output, full-duplex differential interface on a 5 V supply. Its 4.5 V to 5.5 V operating range, 25 Mbps maximum data rate, and 1/8 unit load supporting up to 256 nodes provide useful margin for equipment cabinets, controller boards, remote I/O, and industrial gateways. Select the appropriate transition-time option so edge rate matches cable length and topology rather than automatically using the fastest setting. The bus still needs application-specific protection, grounding, connector design, and validation across worst-case temperature and cable conditions.
Recommended
Factory Automation Equipment
The SN65HVD50D can connect factory automation controllers, drives, remote terminals, and sensors over RS-485 or RS-422. Full-duplex operation permits simultaneous command transmission and status reception, while the 50 mV receiver hysteresis helps the receiver distinguish a valid differential signal from noise. The 25 Mbps capability supports high-speed data paths, although practical industrial cables are normally operated more slowly for distance and EMC reasons. Use the selectable driver edge rates, provide surge protection, and verify node spacing and termination in the final bus topology.
Recommended
Building Automation Systems
The SN65HVD50D is appropriate for building-automation controllers, floor modules, HVAC interfaces, and access-control equipment using differential RS-485 communication. Its 1/8 unit-load option allows denser bus populations of up to 256 nodes, while the -40 °C to +85 °C range supports temperature variation between controlled indoor equipment and less controlled peripheral locations. Building systems often span long cable runs and share grounds imperfectly, so surge protection, common-mode assessment, shielded routing, and chassis grounding remain essential even when ESD protection exceeds 15 kV HBM.
Recommended
High-Speed Data Communication Links
The SN65HVD50D supports high-speed differential data links up to 25 Mbps when cable length, loss, skew, reflections, and connector behavior permit. Its selectable 1 Mbps, 5 Mbps, and 25 Mbps driver transition times let engineers trade data throughput for reduced edge energy and potentially better EMC behavior on longer channels. In a point-to-point or full-duplex arrangement, the receiver's 50 mV hysteresis improves noise tolerance. Board-level validation should examine eye opening, differential impedance, return loss, common-mode voltage, and radiated emissions under worst-case loading.
Recommended
Test and Measurement Instruments
The SN65HVD50D can provide a robust full-duplex RS-485/RS-422 link between measurement instruments, automated test systems, fixture controllers, and laboratory computers. The 25 Mbps rate allows high-volume command and response traffic, and the 50 mV receiver hysteresis helps maintain valid logic decisions when coupled through realistic test cables. Standby current of 1 µA is also useful where the interface must remain connected without materially increasing standby consumption. Use controlled transition times, verify cable impedance, and include protection for connection and disconnection events.
Recommended
Telecommunications Equipment
The SN65HVD50D is suitable for line cards, remote terminal units, base-station equipment, and other telecommunications interfaces that use full-duplex RS-485 or RS-422 links. The 4.5 V to 5.5 V supply supports established 5 V interface architectures, and the high-output driver is intended for driving differential interconnect. At data rates as high as 25 Mbps, board and chassis design become critical: maintain controlled differential geometry, minimize stubs, provide return paths, and verify both conducted and radiated emissions. The device's ESD capability is useful but does not eliminate external surge-protection requirements.
Recommended
Recommended Products Summary
Engineering reference data for SN65HVD50D — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SN65HVD50DG4 | SN65HVD50DRG4 |
|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Function | High-output full-duplex RS-485 driver and receiver | Reported as functionally and performance-compatible replacement | Reported as functionally and performance-compatible replacement |
Key Differentiators
- High-output full-duplex interface (vs SN65HVD50DG4)
- High data-rate capability (vs SN65HVD50DG4)
- Dense-node bus support (vs SN65HVD50DG4)
Design Notes
The SN65HVD50D can operate at 25 Mbps, so the PCB should route the differential pair with continuous reference-plane return, controlled differential impedance, matched pair lengths, and minimal stubs. Use the slower 1 Mbps or 5 Mbps driver transition-time option when the cable route is long or EMC margin is limited. Validate the complete transceiver, connector, cable, and termination system because a compliant IC alone does not guarantee acceptable eye opening or radiated emissions.
Do not assume that the SN65HVD50D's bus-pin ESD rating replaces external surge and lightning protection. The verified data states that bus-pin ESD protection exceeds 15 kV HBM, but industrial installations may also require transient-voltage suppression, current limiting, and chassis-ground coordination. Confirm the selected transition-time control state, verify bus termination only where required by the topology, and ensure that every transceiver shares a compatible common-mode range.
Place the 4.5 V to 5.5 V supply decoupling capacitor close to the device supply and ground pins, and route return current without sharing a noisy path with the differential bus. Keep the receiver and driver supply distribution compact so switching current in external protection or isolation circuitry does not create supply bounce at the transceiver. The provided data confirms 1 µA standby current, but it does not provide active supply-current limits; use the manufacturer datasheet for worst-case power calculations.
Keep the RS-485/RS-422 differential pair away from clocks, switching power nodes, relay contacts, and high-current return paths. Match the connector and cable impedances as closely as practical, avoid unnecessary test pads and long stubs, and use a continuous ground or reference plane beneath the pair where the return path permits. If the interface crosses an isolation barrier or ground-potential boundary, provide an appropriately rated isolation and protection solution rather than relying only on the transceiver's internal ESD structure.
Compliance Information
The supplied verified excerpts do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. Compliance fields remain unknown rather than assumed.
