SN65HVD22P - 500kbps Extended RS-485 | Texas Instruments
MPN: SN65HVD22P ✓ ActiveSN65HVD22P Overview
An RS-485 transceiver is an interface IC that converts digital logic signals into differential bus levels and converts differential bus levels back into logic-compatible signals. The SN65HVD22 family belongs to the RS-485 transceiver class of interface ICs within the broader industrial communications hierarchy. Its differential signaling supports communication over longer cables than single-ended interfaces while reducing susceptibility to common-mode electrical noise.
The SN65HVD22P supports data rates up to 500kbps. Its -20V to 25V common-mode operating range exceeds the typical TIA/EIA-485-A requirement, improving tolerance to ground-potential differences between devices connected to long cables. The family also provides high ESD protection, wide receiver hysteresis, and failsafe operation, which help a bus remain interpretable when the bus is idle or a driver is disconnected.
Typical uses include industrial automation equipment, building-control systems, factory data buses, remote sensor interfaces, and utility monitoring networks. The receiver’s wide hysteresis reduces sensitivity to noise near the decision threshold, while failsafe behavior provides a defined state when the bus is not actively driven. The 500kbps rate balances communication throughput against the distance and termination requirements of an RS-485 network.
For a new RS-485 design, place the transceiver close to the bus connector and keep the differential route short, symmetrical, and continuous over a solid ground plane. Provide the termination, biasing, isolation, and surge-protection components required by the cable environment. Do not treat the extended common-mode range as a substitute for normal grounding and cable design practices.
This product page combines the Texas Instruments device information with practical guidance on common-mode tolerance, failsafe behavior, signal integrity, and package-level replacement decisions. It also distinguishes verified operating characteristics from specifications that must be confirmed in the manufacturer datasheet before a design is released.
Drop-in alternatives for SN65HVD22P — 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 SN65HVD22P (same form factor and footprint) — differing in Package, Supported Standards.
SN65HVD22PG4
✅ Drop-In📋 Reference alternative (not in catalog)
SN65HVD22P Specifications
| Product Type | Extended common-mode RS-485 transceiver |
| Data Rate | 500kbps |
| Extended Common-Mode Voltage Range | -20V to 25V |
| Driver Count | 1 driver |
| Receiver Count | 1 receiver |
| Communication Mode | Half-duplex |
| Supported Standards | TIA/EIA-485-A, RS-485, RS-422 |
| ESD Protection | High ESD protection |
| Receiver Hysteresis | Wide receiver hysteresis |
| Failsafe Operation | Supported |
| Supply Voltage | 5V nominal |
| Package | PDIP-8, 8 pins |
| Mounting Type | Through-hole |
SN65HVD22P pdip-8, 8 pins Pin Configuration Guide
Pin configuration for SN65HVD22P (pdip-8, 8 pins 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 SN65HVD22P.
Refer to the datasheet for full pin configuration.
Typical Applications
SN65HVD22P is suitable for 6 applications: Industrial Automation Bus, Building Control and HVAC Networks, Remote Sensor Monitoring, Utility and Metering Networks, Factory Data Acquisition, Gate and Access Control Equipment.
Industrial Automation Bus
The SN65HVD22P fits industrial automation buses that connect sensors, actuators, controllers, and remote I/O modules over a differential RS-485 network. Its 500kbps maximum rate supports responsive equipment communication, while the -20V to 25V common-mode range provides additional tolerance for ground-potential differences between factory equipment. Wide receiver hysteresis and failsafe operation improve interpretation of noisy or idle-bus conditions. Place the transceiver near the field connector, route A and B as a controlled differential pair, and apply termination and biasing according to the bus topology.
Recommended
Building Control and HVAC Networks
The SN65HVD22P is appropriate for building-control networks linking room controllers, dampers, sensors, and supervisory equipment over RS-485. The 500kbps capability handles periodic status and command traffic, while the extended common-mode range helps when connected controllers operate from different reference grounds. High ESD protection is valuable near building entry points and touchable equipment, although external surge protection may still be required. Verify polarity, bus termination, and fail-safe biasing before deployment to prevent reflected signals and ambiguous idle states.
Recommended
Remote Sensor Monitoring
The SN65HVD22P can connect remote sensors and monitoring nodes to a centralized data-acquisition system over long RS-485 cables. Differential signaling reduces sensitivity to common-mode noise, and the -20V to 25V common-mode capability improves robustness when field devices share power with unrelated equipment. The 500kbps rate supports aggregated measurements without requiring a separate high-speed transceiver for each sensor. Keep the bus away from motors and switching power stages, use twisted-pair wiring, and add protection at cable-entry points where electrostatic discharge or lightning transients can occur.
Recommended
Utility and Metering Networks
The SN65HVD22P is suitable for utility metering and distributed energy-monitoring networks that use long cable runs and equipment with different ground potentials. Its extended -20V to 25V common-mode range gives the interface more tolerance than a conventional RS-485 receiver, while 500kbps supports grouped meter readings and control traffic. Failsafe operation helps establish a predictable bus state when all transmitters are inactive. Design the network for its grounding faults and surge environment, since transceiver common-mode tolerance does not replace protective grounding or coordinated surge suppression.
Recommended
Factory Data Acquisition
The SN65HVD22P supports factory data-acquisition systems that gather measurements from multiple machines over a shared RS-485 bus. A 500kbps link can consolidate periodic process data, while the wide receiver hysteresis and failsafe features improve behavior in electrically noisy production areas. The extended common-mode range is useful when industrial machines have substantial ground-offset differences. Place termination only at the physical ends of the bus, bias the network once, and keep the differential route away from motor cables and high-current switching nodes to preserve signal integrity.
Recommended
Gate and Access Control Equipment
The SN65HVD22P can support access-control readers, gate controllers, and distributed door equipment connected by an RS-485 wiring backbone. Its high ESD protection and failsafe behavior are useful in commercial installations where cables may be handled or exposed to electrostatic discharge. The 500kbps rate supports command, status, and identification traffic across a shared bus. Use shielded or twisted-pair cabling as required by the installation, maintain defined idle biasing, and use surge protection where the cable leaves the controlled building environment.
Recommended
Recommended Products Summary
Engineering reference data for SN65HVD22P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SN65HVD22PG4 |
|---|---|---|
| Package | PDIP-8 | PDIP-8 |
| Brand | Texas Instruments | Texas Instruments |
| Product Type | Extended common-mode RS-485 transceiver | Extended common-mode RS-485 transceiver |
| Maximum Data Rate | 500kbps | 500kbps |
| Extended Common-Mode Voltage Range | -20V to 25V | -20V to 25V |
| Driver and Receiver Configuration | 1 driver, 1 receiver | 1 driver, 1 receiver |
| ESD Protection | High ESD protection | High ESD protection |
| Receiver Hysteresis | Wide receiver hysteresis | Wide receiver hysteresis |
| Failsafe Operation | Supported | Supported |
| Supply Voltage | 5V nominal | 5V nominal |
Key Differentiators
- Broader common-mode operating range (vs SN65HVD22PG4)
- No functional-rate penalty in the confirmed package alternative (vs SN65HVD22PG4)
- Equivalent protection and failsafe feature set (vs SN65HVD22PG4)
Design Notes
Route the RS-485 A and B conductors as a tightly coupled differential pair from the transceiver to the connector. Keep the pair over a continuous ground plane, maintain uniform spacing and width through the PCB, and avoid crossing splits or high-current return paths. Position the transceiver near the external connector to minimize exposed trace length and reduce sensitivity to electrostatic discharge entering from the cable.
Do not rely on the SN65HVD22P’s -20V to 25V common-mode tolerance as a substitute for correct bus biasing or grounding. An idle RS-485 bus still requires a deterministic fail-safe state through appropriate bias resistors. Confirm driver-enable and receiver-enable control logic so the transceiver cannot contend with another transmitter, and verify that A and B naming is consistent across every device on the bus.
Use termination only at the physical ends of a multidrop RS-485 bus, and select the termination value and topology using the manufacturer’s guidance and the installed cable. Keep cables away from motors, contactors, radio transmitters, and high di/dt power wiring. If the link crosses an environment with lightning or large switching transients, add coordinated surge protection and consider galvanic isolation rather than relying solely on the transceiver’s internal ESD protection.
Compliance Information
Compliance status was not explicitly identified in the available product information and must be confirmed from the manufacturer product page or current datasheet.
