SN65HVD22D Extended Common-Mode RS-485 | Texas Instruments
MPN: SN65HVD22D ✓ ActiveSN65HVD22D Overview
An RS-485 transceiver is an interface IC that converts logic-level signals into differential bus voltages and receives differential bus voltages back into logic-level data. The SN65HVD22D belongs to the transceiver hierarchy that includes RS-422 and RS-485 interface devices, differential line drivers, differential receivers, and communication interface semiconductors. Its extended common-mode capability improves tolerance to ground offsets, induced noise, and wiring differences in long cable networks.
The SN65HVD22D provides a 500 kbps reference-design interface rate, a -20 V to 25 V common-mode range, and operation from a single 5 V supply. These characteristics make it suitable for factory automation equipment, industrial controllers, remote sensor nodes, and building automation systems where a conventional RS-485 receiver may become vulnerable to bus transients or uneven grounding. The extended range also supports robust operation in electrically noisy environments when paired with appropriate cables and protection components.
Its half-duplex architecture means the driver and receiver share the same differential bus pair. Direction control determines whether the node transmits or receives, while an external bus bias network establishes the logic state of an idle bus. The 8-pin SOIC package supports conventional surface-mount assembly and fits industrial interface boards requiring compact pin compatibility with other single-chip transceivers.
Typical applications include 500 kbps RS-485 links between PLCs and remote I/O modules, motor-control diagnostics, industrial sensors, building controls, and instrumentation networks. In these systems, the SN65HVD22D can remain operational when ground-potential differences place bus voltages outside the common-mode range of many standard RS-485 devices, reducing sensitivity to grounding mistakes.
The primary design consideration is common-mode margin. Evaluate the maximum voltage between the bus and local ground under every operating and fault condition, then select external protection that keeps transient stresses within the device limits. Keep the transceiver and termination components close to the bus connector, use a controlled ground reference, and follow the manufacturer’s reference design when the interface will be exposed to industrial cable transients.
This page combines the exact SN65HVD22D identity, package information, interface capability, application guidance, comparison criteria, and design cautions needed to evaluate the part for an extended-common-mode RS-485 design.
Drop-in alternatives for SN65HVD22D — 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 SN65HVD22D (same form factor and footprint) — differing in Package, Product Type, Transceiver Configuration, Driver and Receiver Count, Interface Standard.
SN65HVD61D
✅ Drop-InContact for price
View Datasheet →SN65HVD11DG4
✅ Drop-In📋 Reference alternative (not in catalog)
SN65HVD07D
✅ Drop-InContact for price
View Datasheet →SN65HVD82D
✅ Drop-InContact for price
View Datasheet →SN65HVD22D Specifications
| Device Type | 1/1 transceiver half |
| Interface Standard | RS-422, RS-485 |
| Technology | RS-485 |
| Supply Voltage | 5 V |
| Maximum Data Rate | 500 kbps |
| Common-Mode Voltage Range | -20 V to 25 V |
| Operating Temperature | -40 C to 85 C |
| Package Type | SOIC, plastic, MS-012AA |
| Package | SOIC-8 (D) |
| Number of Pins | 8 pins |
| Mounting Type | Surface mount |
| Driver Count | 1 driver |
| Receiver Count | 1 receiver |
| Duplex Configuration | Half duplex |
SN65HVD22D soic-8 (d) Pin Configuration Guide
Pin configuration for SN65HVD22D (soic-8 (d) 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 SN65HVD22D.
Refer to the datasheet for full pin configuration.
Typical Applications
SN65HVD22D is suitable for 6 applications: Industrial PLC Remote I/O, Factory Automation Sensor Network, Building Automation Controller, Motor Drive Diagnostic Link, Instrumentation and Test Equipment, Remote Environmental Sensor Node.
Industrial PLC Remote I/O
The SN65HVD22D fits industrial PLC-to-remote-I/O links operating at up to 500 kbps on a 5 V interface. Its -20 V to 25 V common-mode range provides useful tolerance for ground-potential differences between widely separated cabinets, while the half-duplex architecture limits each node to one differential pair. Place the transceiver near the bus connector, apply the documented termination and fail-safe arrangement, and validate the installation against the 500 kbps reference design. The benefit is improved robustness to grounding imperfections, although cable routing and transient protection remain essential.
Recommended
Factory Automation Sensor Network
The SN65HVD22D can connect remote sensors and actuators to a factory controller when the bus must tolerate grounding differences between production equipment. Its 500 kbps maximum rate supports moderate-speed data collection, and its extended -20 V to 25 V common-mode range reduces the risk of receiver saturation when local ground potentials shift. Use a consistent bus topology, termination at physical endpoints, and surge protection at cable entry points. Verify the transceiver and protection device voltage ratings together so transient clamping does not exceed the interface’s operating conditions.
Recommended
Building Automation Controller
The SN65HVD22D is appropriate for building automation links carrying control and sensor data between distributed controllers, HVAC equipment, and access-control panels. The 500 kbps rate is more than sufficient for many low-bandwidth control messages, while the extended common-mode range helps manage ground offsets between separately powered floors or rooms. Keep the bus away from high-energy switching circuits, use a controlled shield-ground strategy, and place termination near the cable connector. The half-duplex direction-control requirement should be handled by the host firmware to prevent simultaneous transmission and receiver contention.
Recommended
Motor Drive Diagnostic Link
The SN65HVD22D can support a diagnostic RS-485 link between a motor controller and supervisory equipment where motor-side ground bounce and electrical noise are concerns. Its common-mode tolerance of -20 V to 25 V gives designers additional margin relative to a conventional interface, and the 500 kbps rate is suitable for parameter reporting and command traffic. Keep the differential route away from motor phases and use appropriately rated surge protection. Validate the bus under the highest motor-load condition because chassis, cable, and ground bonding determine the actual voltage seen by the transceiver.
Recommended
Instrumentation and Test Equipment
The SN65HVD22D can connect laboratory or field instrumentation over a 5 V RS-485 bus at up to 500 kbps. The extended common-mode range helps the instrument interface tolerate voltage differences between bench equipment and external sensors, while the 8-pin SOIC package simplifies compact interface-board construction. Use the manufacturer reference topology, observe termination requirements, and keep analog or sensitive sensor circuitry away from the bus connector. For installations with large ground offsets or long unshielded cables, an isolated interface may provide a better safety and ground-domain boundary.
Recommended
Remote Environmental Sensor Node
The SN65HVD22D supports low-to-moderate-speed environmental monitoring networks that connect remote temperature, humidity, and air-quality sensors to a central controller. A 500 kbps half-duplex bus can service multiple polled nodes, and the extended common-mode range improves tolerance to ground differences caused by long outdoor cables. Use twisted-pair wiring, endpoint termination, and weather-appropriate surge protection. Firmware should allow adequate turnaround time between transmitting and receiving because the transceiver shares one bus pair and cannot transmit and receive independently at the same time.
Recommended
Recommended Products Summary
Engineering reference data for SN65HVD22D — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SN65HVD61D | SN65HVD11DG4 | SN65HVD07D | SN65HVD82D |
|---|---|---|---|---|---|
| Package | SOIC-8 (D) | SOIC-8 (D) | SOIC-8 (D) | SOIC-8 (D) | SOIC-8 (D) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
Key Differentiators
- Extended common-mode operating range (vs SN65HVD61D)
- Documented 500 kbps reference interface (vs SN65HVD11DG4)
- Direct-fit 8-pin SOIC organization (vs SN65HVD07D)
- Extended common-mode tolerance versus the TI family (vs SN65HVD82D)
Design Notes
Place the SN65HVD22D, bus-side protection, and termination network close to the RS-485 connector. Keep the differential route short, use a continuous reference plane, and route the pair as a coupled pair rather than separating the traces around other circuitry. This arrangement reduces radiated pickup and helps preserve the integrity of the 500 kbps interface while avoiding reflections at the bus endpoint.
Do not treat the -20 V to 25 V common-mode range as permission for unlimited bus voltage. Review every operating and fault condition, including powered-off nodes and severe ground offsets, and use suitable surge protection at cable entry. Confirm that protection-device clamping voltages, transceiver absolute-maximum ratings, and grounding arrangements are compatible before releasing the PCB.
Follow the manufacturer reference design for 5 V supply decoupling and pin connections. Place the required bypass capacitor immediately beside the device supply pin with a short ground return, and avoid routing return current beneath the differential bus traces. The transceiver’s supply and ground connections must remain stable during cable transients so receiver and driver behavior is not affected by supply disturbance.
Use the documented termination and fail-safe-bias arrangement for the selected bus topology. Because the SN65HVD22D is half duplex, software must prevent transmission while the node is receiving and must allow sufficient turnaround time before listening. Verify operation over the complete cable length, data rate, common-mode offset, and termination tolerance rather than testing only at short cable distances.
Compliance Information
The manufacturer product and datasheet pages identify the device as a TIA/EIA-485-A-compatible extended common-mode transceiver, but no specific RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status was confirmed for SN65HVD22D.
