THVD1450DRBR - 3.3-5V RS-485 Transceiver, ±18kV ESD, 50Mbps | TI
MPN: THVD1450DRBR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.45 | $2.45 |
| 10 | $2.21 | $22.10 |
| 100 | $1.96 | $196.00 |
| 500 | $1.72 | $860.00 |
| 1,000 | $1.48 | $1,480.00 |
| 3,000 | $1.25 | $3,750.00 |
THVD1450DRBR Overview
An RS-485/RS-422 transceiver is a physical-layer interface IC that converts between a single-ended UART/logic signal on the controller side and a differential voltage on a twisted-pair cable. Half-duplex operation means the same differential pair is shared between transmit and receive paths, reducing wire count for multi-drop industrial networks such as Modbus RTU, Profibus, and DMX512. Within the broader signal-chain taxonomy, the THVD1450 belongs to the transceiver -> line driver/receiver -> interface IC -> power-tree signal-chain hierarchy used in industrial automation, building automation, and point-of-sale equipment.
Key differentiating features include ±18-kV IEC 61000-4-2 contact/air ESD immunity on the bus pins, ±4-kV IEC 61000-4-4 EFT immunity, and a wide 3-V to 5.5-V supply range that allows direct connection to 3.3-V MCUs or 5-V legacy controllers without external level shifters. The integrated fail-safe biasing on the receiver guarantees a known logic-high output when the bus is idle, shorted, or open. The 8-pin VSON EP package with exposed thermal pad occupies only 3x3 mm, suitable for dense fieldbus nodes and compact sensor modules.
The architecture uses a differential line driver with controlled slew rate and a differential comparator receiver with 30 mV of hysteresis for noise rejection. The wide common-mode range (typically -7 V to +12 V) tolerates ground-potential differences between nodes on long cable runs, while the 1-unit-load receiver (32 nodes) supports large multi-drop networks within Modbus-style installations.
Typical applications include industrial fieldbus networks, motor-drive feedback links, building-automation gateways, solar inverter monitoring, and any cable link requiring IEC-rated ESD/EFT robustness. The bus pins survive ±18-kV contact discharge per IEC 61000-4-2, eliminating external TVS diode arrays in many designs.
When designing with this part, place a 100 nF decoupling capacitor close to VCC, respect the DRB exposed-pad layout for thermal spreading, and rely on the internal fail-safe biasing rather than an external resistor network. The wide common-mode range means most cable installations work without additional protection circuitry.
This page consolidates distributor pricing, drop-in alternatives in the same 8-VSON footprint, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for THVD1450DRBR — 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 THVD1450DRBR (same form factor and footprint) — differing in Package, Function, Protocol, Operating Temperature Range, Unit Load.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
THVD1450DR
✅ Drop-In📋 Reference alternative (not in catalog)
THVD1451DRBR
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$0.85 / Unit
View Datasheet →SN65HVD75DRBR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ISO1450BDWR
✅ Drop-In✓ In Stock
$2.95 / Unit
View Datasheet →THVD1450DRBR Specifications
| Product Type | RS-485/RS-422 Transceiver (half-duplex) |
| Number of Drivers/Receivers | 1/1 |
| Supply Voltage (VCC) | 3 V to 5.5 V |
| Maximum Data Rate | 50 Mbps |
| ESD Protection (Bus Pins) | ±18 kV IEC 61000-4-2 contact/air |
| EFT Immunity | ±4 kV IEC 61000-4-4 |
| Common-Mode Range | -7 V to +12 V |
| Receiver Hysteresis | 30 mV |
| Receiver Fail-Safe | Internal biasing (idle/short/open = logic high) |
| Unit Load | 1 UL (32 nodes on bus) |
| Operating Temperature | -40°C to +125°C |
| Package | 8-VSON EP (DRB) 3x3 mm |
| Mounting Type | Surface Mount, wettable flank |
| Moisture Sensitivity Level | MSL 1 |
| RoHS Status | Compliant |
| Duplex Mode | Half |
THVD1450DRBR Pin Configuration
| Pin 1 | R — Receiver output (logic level referenced to VCC) |
| Pin 2 | RE# — Receiver enable (active low; tie low or float for always-on) |
| Pin 3 | DE — Driver enable (logic high enables driver output) |
| Pin 4 | GND — Ground reference |
| Pin 5 | D — Driver input (logic level referenced to VCC) |
| Pin 6 | VCC — Supply input, 3.0 V to 5.5 V |
| Pin 7 | B/Z — Inverting differential bus pin |
| Pin 8 | A/Y — Non-inverting differential bus pin |
Typical Applications
THVD1450DRBR is suitable for 7 applications: Industrial Modbus RTU Fieldbus, Motor Drive Position Feedback Link, Building Automation Gateway, Solar Inverter Monitoring, Point-of-Sale (POS) Terminal Wiring, Cable-Driven Sensor Network, Industrial I/O Module Backplane.
Industrial Modbus RTU Fieldbus
The THVD1450DRBR is engineered for industrial Modbus RTU and Profibus DP networks where multi-drop RS-485 links must survive plant-floor ESD events. Its ±18-kV IEC 61000-4-2 contact discharge protection on bus pins A/Y and B/Z eliminates external TVS arrays that designers would otherwise need at every node. The 1-unit-load receiver input supports up to 32 transceivers on the same twisted pair, matching standard Modbus RTU multi-drop installations. Internal fail-safe biasing guarantees a known logic-high output when no driver is active or when the bus is shorted, eliminating the external pull-up/pull-down resistor network typical of older 75176-type transceivers. The 50-Mbps data rate provides ample margin for 115.2 kbps to 12 Mbps Modbus/PROFIBUS baud rates. Place 100 nF decoupling on VCC and connect the exposed thermal pad to a 0.5 square-inch copper pour for thermal stability across -40°C to +125°C operation.
Recommended
Motor Drive Position Feedback Link
Servo drives, stepper amplifiers, and robot controllers use the THVD1450DRBR for encoder and resolver feedback running back to the motion controller over shielded twisted pair. The wide -7 V to +12 V common-mode range tolerates ground bounce between drive stages and the controller cabinet, a common pain point in CNC and 6-axis robot installations where switching currents create ground transients. The 50-Mbps data rate supports BiSS-C and SSI encoder protocols where 10-20 MHz serial streams are common. The ±18-kV IEC 61000-4-2 ESD rating on the bus pins means the feedback link survives handling and field wiring mistakes without the cost of an external TVS clamp. Pair the THVD1450DRBR with an isolated gate driver such as ISO7761DW upstream to complete the drive-stage communication chain, sharing the same IEC ESD/EFT immunity profile.
Recommended
Building Automation Gateway
BACnet MS/TP, LonWorks, and DMX512 lighting-control networks rely on RS-485 transceivers like the THVD1450DRBR to carry HVAC, lighting, and access-control traffic across floor-distribution wiring. The 3-V to 5.5-V supply directly supports battery-backed 3.3-V gateway MCUs as well as legacy 5-V controllers without a level shifter, simplifying the gateway BOM. The ±4-kV IEC 61000-4-4 EFT immunity is critical for building installations where fluorescent-lamp ballast switching injects fast transients into conduit runs. The 8-VSON EP 3x3 mm footprint fits inside compact ceiling-mounted sensor/actuator modules, and the -40°C to +125°C operating range covers unconditioned plenum spaces. Combined with the TI ISO7762FDWR for upstream Ethernet isolation, the THVD1450DRBR anchors a robust building-automation node.
Recommended
Solar Inverter Monitoring
String-level monitoring in commercial photovoltaic arrays uses RS-485 multi-drop to aggregate data from each module-level optimizer or string inverter back to a combiner-box data logger. The THVD1450DRBR is well-matched to this environment, with its -40°C to +125°C operating range covering rooftop inverter enclosures and ±18-kV IEC 61000-4-2 ESD protecting the bus from installer-tool discharge during commissioning. The 1-unit-load (32-node) receiver budget allows string aggregators to monitor 20-30 optimizers per RS-485 drop, fitting typical 1000-V DC rooftop arrays. Fail-safe biasing eliminates the bus-idle false-trigger problem that older 75176 transceivers suffered from. Pair the THVD1450DRBR with a wide-input DC-DC such as the TPS54302 for isolated bus power, completing a robust photovoltaic monitoring node.
Recommended
Point-of-Sale (POS) Terminal Wiring
Retail point-of-sale terminals often connect to receipt printers, bar-code scanners, cash-drawer triggers, and customer-facing pole displays over RS-485 multi-drop cable runs. The THVD1450DRBR's small 3x3 mm VSON EP footprint integrates easily into compact POS housing, and its 3.3-V supply matches the modern ARM Cortex-M0 based terminal MCUs. The ±18-kV IEC 61000-4-2 ESD rating protects against static discharge from cashiers during cable insertion, a leading cause of field returns in retail electronics. The 50-Mbps data rate comfortably exceeds the 115.2 kbps typical of POS peripherals and provides headroom for future higher-speed barcode imaging. The exposed thermal pad can be soldered to a small copper island for thermal relief without requiring an external heatsink at typical traffic levels.
Recommended
Cable-Driven Sensor Network
Distributed sensor networks in agricultural irrigation, environmental monitoring, and industrial-tank farms use RS-485 multi-drop cable runs of 100 m to 1 km, where ground-potential differences between sensor nodes can be several volts. The THVD1450DRBR's -7 V to +12 V common-mode range tolerates these differences without external isolators at every node, reducing cost and complexity in long cable runs. The 1-unit-load (32-node) receiver budget easily supports 10-20 sensor nodes per drop. Fail-safe biasing handles cable-breaks and partial shorts typical of agricultural and outdoor deployments. The ±18-kV IEC 61000-4-2 ESD on the bus pins survives lightning-induced transients that couple into long cable runs, an essential property for outdoor installations without dedicated surge protection. Pair the THVD1450DRBR with the SN65HVD230DR-CAN companion for systems that mix CAN-based and RS-485 sensors.
Recommended
Industrial I/O Module Backplane
Programmable Logic Controller (PLC) racks and distributed I/O blocks communicate internally over RS-485 backplanes carrying 24-V field-side signals to controller-side logic. The THVD1450DRBR is a fit for the backplane transceiver because its 3-V to 5.5-V supply directly interfaces with controller-side 3.3-V I/O while its ±18-kV IEC 61000-4-2 ESD protects against field-side cable transients. The 50-Mbps bandwidth allows high-speed backplane links (e.g., PROFINET IRT or EtherCAT sub-bus implementations) where deterministic latency matters. The 8-VSON EP 3x3 mm footprint is dense enough for multi-channel I/O modules where backplane PCB real estate is constrained. Internal fail-safe biasing eliminates external resistor networks, saving BOM and simplifying PCB layout for high-density I/O modules.
Recommended
Recommended Products Summary
Engineering reference data for THVD1450DRBR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | THVD1450DR | THVD1451DRBR | SN65HVD75DRBR | ISO1450BDWR |
|---|---|---|---|---|---|
| Package | 8-VSON EP (DRB) 3x3 mm | 8-VSON EP (DRB) 3x3 mm - same | 8-VSON EP (DRB) 3x3 mm - same | 8-VSON EP (DRB) 3x3 mm - same | SOIC-16W (DW) - DIFFERENT package |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Supply Voltage | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.3 V (3.0 V to 3.6 V) | 3.0 V to 5.5 V (isolated side) |
| Maximum Data Rate | 50 Mbps | 50 Mbps | 50 Mbps | 20 Mbps (-60%) | 25 Mbps (-50%) |
| ESD Protection (IEC 61000-4-2) | ±18 kV | ±18 kV | ±18 kV | ±16 kV | ±18 kV (isolation rated) |
| Common-Mode Range | -7 V to +12 V | -7 V to +12 V | -25 V to +25 V (wider) | -7 V to +12 V | -7 V to +12 V |
| Number of Drivers/Receivers | 1/1 | 1/1 | 1/1 | 1/1 | 1/1 |
| Duplex Mode | Half | Half | Half | Half | Half |
| Unit Load | 1 UL (32 nodes) | 1 UL (32 nodes) | 1/8 UL (256 nodes) | 1/8 UL (256 nodes) | 1 UL (32 nodes) |
| Operating Temperature | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C | -40°C to +85°C | -40°C to +85°C |
Key Differentiators
- ±18 kV IEC 61000-4-2 ESD on bus pins eliminates external TVS (vs SN65HVD75DRBR)
- 50 Mbps data rate vs 20 Mbps on SN65HVD75DRBR (vs SN65HVD75DRBR)
- Wide -40°C to +125°C operating range (vs ISO1450BDWR)
- 3.3 V to 5 V supply in one part (vs SN65HVD234DR)
Design Notes
Decoupling: Place a 100 nF X7R ceramic capacitor within 1 mm of pin 6 (VCC) and pin 4 (GND). For 5-V operation above 10 Mbps, add a parallel 10 nF X7R for high-frequency noise. The DRB exposed thermal pad must be soldered to a ground copper island of at least 0.3 square inches for thermal relief, per TI Section 10 Layout recommendations. Estimated: at 50 Mbps and 5 V supply, driver current spikes reach 60 mA - insufficient bulk decoupling will cause VCC droop and inter-symbol jitter.
Bus pin routing: Route the A/Y and B/Z differential pair as a 100-ohm differential microstrip with 6-mil trace width and 8-mil gap, kept matched within 0.5 mm. Maintain a 3W rule from the bus to digital clock lines to avoid coupling on the differential edge. Place the THVD1450DRBR within 5 mm of the bus connector to minimize stub length; the ±18-kV ESD protection is most effective when the discharge path is short.
RE# and DE management: When RE# is tied low and DE is tied high, the driver is always active and the receiver is always enabled - this is the recommended mode for half-duplex RS-485 repeaters. Avoid floating RE# in noisy environments; tie it through a 10 kohm resistor to GND to prevent floating-state lockups that cause permanent bus contention. If using direction-controlled mode, ensure the MCU toggles DE and RE# simultaneously with a 100 ns dead-band to avoid bus contention during transition.
Power dissipation: At VCC = 5 V, the THVD1450DRBR draws up to 10 mA in idle and 60 mA in transmit, dissipating up to 300 mW into the 8-VSON EP package. Estimated: with the DRB exposed pad soldered to 0.5 square inches of 1-oz copper on a 4-layer FR-4 board, theta_JA is approximately 55 C/W, limiting junction-to-ambient rise to 17 C at 300 mW - well within the 125 C operating limit. No heatsink required.
Compliance Information
RoHS and lead-free per TI product page. Not AEC-Q100 qualified - select THVD1450DRBR-Q1 or ISO1450BDWR for automotive-qualified designs. IEC 61000-4-2 ESD and IEC 61000-4-4 EFT immunity ratings per TI datasheet Section 9.3.
