SN65HVD23P - 25 Mbps Extended CM RS-485 Transceiver | TI
MPN: SN65HVD23P ✓ ActiveSN65HVD23P Overview
An RS-485 transceiver is the physical-layer interface between a digital controller or microcontroller and a balanced, multipoint communication bus. It combines a differential line driver, a differential receiver, and driver-enable control in one package. In the hierarchy of electronic components, the SN65HVD23P is a bus transceiver within the interface IC category, bridging a logic-level UART or controller connection to a noise-resistant differential bus.
Key features include a 25 Mbps maximum signaling rate, extended common-mode operation from -20 V to 25 V, receiver equalization for improved cable-length capability, and bus I/O protection exceeding 16 kV HBM. The reduced unit-load architecture allows up to 256 nodes on a bus, an important distinction from transceivers designed around one-half or one-eighth unit loads. The 8-pin PDIP package also provides through-hole mechanical compatibility for industrial and legacy control equipment.
The transceiver combines a push-pull differential driver with a high-impedance differential receiver. Because it is a half-duplex device, the driver and receiver share the same bus pair, making the driver-enable function essential for preventing multiple transmitters from driving the bus simultaneously. The extended common-mode capability helps the receiver interpret differential signals correctly when bus nodes are separated by significant ground potential, although cable routing and grounding still determine practical noise immunity.
Typical applications include industrial factory automation, motor controllers, building-automation equipment, remote sensor nodes, and industrial data acquisition. The part is particularly useful when a bus must tolerate ground offsets, longer cable runs, or more nodes than a standard RS-485 transceiver supports. Its 25 Mbps capability also suits high-rate point-to-point RS-422 links and short high-speed industrial bus segments.
For PCB implementation, treat the differential bus as a controlled-impedance routed pair and keep the transceiver close to the connector or cable termination. Place termination resistors only at the physical ends of the bus. Verify the logic polarity of the driver-enable input in the host firmware because incorrect enable sequencing can cause contention or bus termination faults.
This page combines the verified manufacturer and distributor information with engineering guidance covering common-mode range, bus loading, protection, package reuse, replacement constraints, and design trade-offs that are not presented as one consolidated decision source in the manufacturer product listing.
Drop-in alternatives for SN65HVD23P — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
SN65HVD24P
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
SN65HVD25P
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
SN65HVD26P
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
SN65HVD251P
✅ Drop-In📋 Reference alternative (not in catalog)
SN65HVD21P
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
SN65HVD23P Specifications
| Product Type | RS-422/RS-485 transceiver |
| Transceiver Configuration | 1/1 transceiver, half-duplex |
| Maximum Signaling Rate | 25 Mbps |
| Common-Mode Voltage Range | -20 V to 25 V |
| Standard Compliance | TIA/EIA-485-A |
| Bus Node Capacity | Up to 256 nodes |
| Bus I/O ESD Protection | Over 16 kV HBM |
| Receiver Equalization | Yes |
| Package Type | 8-pin PDIP (P) |
| Package Pin Count | 8 pins |
| Package Length | 9.81 mm |
| Package Width | 9.43 mm |
| Package Body Area | 92.5083 mm² |
| Mounting Style | Through-hole PDIP |
SN65HVD23P 92.5083 mm² Pin Configuration Guide
Pin configuration for SN65HVD23P (92.5083 mm² 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 SN65HVD23P.
Refer to the datasheet for full pin configuration.
Typical Applications
SN65HVD23P is suitable for 6 applications: Industrial Factory Automation Bus, Building Automation and HVAC Control, Motor Drive and Encoder Feedback, Remote Sensor and Telemetry Networks, Point-to-Point High-Speed RS-422 Link, Robotics and Mobile Equipment Communication.
Industrial Factory Automation Bus
The SN65HVD23P suits industrial automation links that require a 25 Mbps signaling rate and a broad common-mode operating range. Its documented -20 V to 25 V range helps the receiver tolerate voltage differences between grounded machines, while support for up to 256 nodes is valuable on a large production line containing controllers, sensors, and remote I/O stations. The device is placed at the bus node, with logic signals routed to the controller and the differential pair routed to a field connector. Because the transceiver is half-duplex, firmware must ensure that only one node enables its driver at a time. Compared with a standard common-mode RS-485 part, the SN65HVD23P provides additional ground-offset tolerance, although cable routing, grounding, and termination remain the primary controls for reliable industrial communication.
Recommended
Building Automation and HVAC Control
The SN65HVD23P fits building-control networks where controllers, thermostats, actuators, and sensors are distributed over a long cable and may sit at different ground potentials. Its extended -20 V to 25 V common-mode range provides more tolerance than the baseline TIA/EIA-485-A requirement, which is valuable in multi-floor installations with imperfect grounding. The 25 Mbps capability also leaves bandwidth margin for low-speed control traffic. The transceiver is normally installed at the edge of the controller board, with the bus pair routed to a terminal block or connector. Termination should be installed only at the two physical ends of the trunk, and long branch stubs should be minimized to preserve edge quality and reduce reflections.
Recommended
Motor Drive and Encoder Feedback
The SN65HVD23P can connect a motion controller to an incremental encoder or remote drive over a balanced RS-422/RS-485 link. The 25 Mbps signaling rate supports high-resolution position feedback and short-distance high-speed data transfer, while the extended common-mode range improves operation when the encoder reference ground differs from the controller ground. Install the transceiver near the differential connector and route the pair as a controlled-impedance pair to reduce noise pickup. The extended range does not replace correct grounding or shielding, and the bus-driver enable should be sequenced so that the controller releases the bus before another node responds, avoiding output contention on the differential pair.
Recommended
Remote Sensor and Telemetry Networks
The SN65HVD23P is appropriate for distributed telemetry networks in which many remote sensing nodes share a two-wire bus. Its reduced unit-load implementation supports up to 256 nodes, enabling larger deployments than transceivers specified with one-half or one-eighth unit loads. The -20 V to 25 V common-mode range also assists installations where sensors are powered from different isolated or locally referenced supplies. Place the transceiver at each sensor node, connect the differential bus to a common routed pair, and apply termination only at the bus endpoints. The 25 Mbps rate is more than sufficient for many sensor protocols and gives additional margin for shorter links where packet timing, rather than baud rate, is the limiting factor.
Recommended
Point-to-Point High-Speed RS-422 Link
Although the SN65HVD23P is widely associated with RS-485 buses, its differential driver and receiver also support point-to-point RS-422-style links. The 25 Mbps signaling rate is valuable for transferring position commands, encoder counts, or machine-control data over a dedicated balanced pair between two cabinets. Extended common-mode tolerance provides additional protection when the two systems are not perfectly grounded. At each endpoint, the transceiver connects the differential pair to a controller UART or logic interface, and the cable should be routed as a pair to minimize differential-mode pickup and impedance discontinuities. For long cables or high data rates, verify skew, attenuation, reflections, and the receiver's valid differential voltage at the far end.
Recommended
Robotics and Mobile Equipment Communication
The SN65HVD23P fits mobile robots and industrial vehicles where controller electronics, motor drives, and sensor modules communicate over a shared bus while power returns and grounding conditions vary. Its extended common-mode range provides tolerance for transients and ground offsets in electrically noisy equipment, and the 25 Mbps capability supports high-rate position or status traffic. The transceiver should be mounted near the connector or protected chassis entry point, with ESD protection and a controlled return path considered in the board layout. Half-duplex operation requires disciplined driver-enable control so that the radio, motor controller, or sensor node does not transmit over an already active driver.
Recommended
Recommended Products Summary
Engineering reference data for SN65HVD23P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SN65HVD24P | SN65HVD25P | SN65HVD26P | SN65HVD251P | SN65HVD21P |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-pin PDIP (P) | 8-pin PDIP (P) | 8-pin PDIP (P) | 8-pin PDIP (P) | 8-pin PDIP (P) | 8-pin PDIP (P) |
Key Differentiators
- Wider documented common-mode operating range than the related SN65HVD25P candidate (vs SN65HVD25P)
- Higher documented signaling rate than the SN65HVD21P candidate (vs SN65HVD21P)
- Large-network support in an 8-pin through-hole package (vs SN65HVD251P)
Design Notes
Route the differential bus conductors as a tightly coupled pair from the transceiver to the connector, with continuous return routing and no plane splits beneath the pair. Keep the driver and receiver interface close to the device and avoid long stubs. Because the SN65HVD23P supports 25 Mbps, edge-rate harmonics are significant even when the payload baud rate is much lower. Add connector-side protection and controlled chassis grounding if the cable leaves the enclosure.
Do not enable more than one transmitter on the shared bus at a time. The SN65HVD23P is half-duplex, so driver-enable timing must prevent contention when a controller responds to another node. Place termination only at the two physical endpoints of the trunk rather than at every node, and leave branch stubs as short as practical. Confirm that the host firmware uses the correct driver-enable polarity rather than assuming an active-high or active-low input.
The extended -20 V to 25 V common-mode range improves tolerance of ground offsets, but it does not replace proper EMC engineering. Use a shielded cable where required, terminate the cable shield according to the installation's grounding strategy, and keep protective devices away from the high-speed bus pins. Verify conducted and radiated emissions at the final baud rate because the 25 Mbps edge capability can radiate harmonics even when application data is transmitted at a lower rate.
Compliance Information
The supplied verified excerpts identify the SN65HVD23P package, interface type, common-mode range, node capacity, protection, and TIA/EIA-485-A compliance but do not explicitly state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is not applicable to the non-automotive SN65HVD23P ordering code as presented.
