component

THVD8000

Public Made by Adom

by adom

TI RS-485 transceiver with FSK modulation, SOT-23-8. Carries data over DC power or shared lines. Datasheet-verified.

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Contents

README

markdown

THVD8000

Texas Instruments · RS-485 transceiver · SOT-23-8

RS-485 transceiver that modulates the data onto an FSK carrier, so the differential signal can share a wire pair that also carries DC power or an existing bus, and a simple capacitor couples it on and off. That lets a network run data and power over the same two wires, cutting cabling in building and industrial systems. An external resistor at F_SET sets the carrier frequency, and MODE selects operation. It behaves like a standard RS-485 transceiver on the logic side (D, R).

Pinout

Pin Name Type Function
1 R output Receive data output. CMOS digital output that recovers demodulated data from the RS-485 bus (OOK-demodulated). VOH ≥ VCC−0.4 V @ IOH = −4 mA; VOL ≤ 0.4 V @ IOL = 4 mA. High-Z when MODE = high (transmit mode).
2 MODE input Transmit/receive mode selection digital input. Low = receive mode; High = transmit mode. Internal 2-MΩ pull-down to GND (defaults to receive if left floating).
3 F_SET input Carrier frequency selection analog input. Connect a resistor RF_SET (1.5 kΩ to 80 kΩ) from this pin to GND to set the OOK carrier frequency f0 (125 kHz to 5 MHz). Recommended load capacitance ≤ 100 pF.
4 D input Driver data input. CMOS logic input carrying the transmit data that will be OOK-modulated onto the A/B bus. Internal 2-MΩ pull-up to VCC. VIH ≥ 2 V, VIL ≤ 0.8 V.
5 GND power_in Device ground reference for supply, logic, and bus circuits.
6 A bidirectional RS-485 differential bus I/O port A (complementary to B). Operational common-mode range −7 V to 12 V; withstands ±18-V DC fault and ±16-kV HBM ESD. Driver short-circuit current limited to ±250 mA.
7 B bidirectional RS-485 differential bus I/O port B (complementary to A). Operational common-mode range −7 V to 12 V; withstands ±18-V DC fault and ±16-kV HBM ESD. Driver short-circuit current limited to ±250 mA.
8 VCC power_in Device supply, 3.0 V to 5.5 V (nominal 3.3 V to 5 V). Absolute maximum 7 V. Decouple with a local ceramic capacitor near the pin.

Key specifications

Parameter Value
Type RS-485 transceiver with FSK modulation
Feature Data over DC power / shared pair (capacitive coupling)
Carrier Set by F_SET resistor
Logic side Driver (D) + receiver (R)
Mode MODE pin
Supply 3.0-5.5 V
Package SOT-23-8

Ordering variants

Same part, different packaging or reel option.

  • THVD8000DDFR (SOT-23-8)
  • THVD8010DDFR (higher data rate)

CAD (KiCad official)

  • Symbol: Interface_UART:THVD8000 (KiCad official)
  • Footprint: Package_TO_SOT_SMD:SOT-23-8
  • 3D model: SOT-23-8 (KiCad packages3D, STEP)
  • 3D model files: thvd8000-etched.step / thvd8000-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); thvd8000.step / thvd8000.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (28 pp, sha256 2c65cc099691c62c, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF