component
TSS521DR
Public Made by Adomby adom
Texas Instruments Buffers, Drivers, Receivers, Transceivers, SOIC-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownTSS521DR
Texas Instruments · Buffers, Drivers, Receivers, Transceivers · SOIC-16
TSS521DR from Texas Instruments, in a SOIC-16. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | BUSL2 | passive | Meter-Bus connection, polarity independent through the input rectifier bridge BR; bus voltage is 10.8 V to 42 V for the receiver and 12 V to 42 V for the transmitter. |
| 2 | VB | power_in | Differential bus voltage after the rectifier, referenced to GND and monitored by comparator TC2 for power fail; the rectifier drop ΔVBR is 1.5 V max at IBUS = 3 mA. |
| 3 | STC | passive | Support capacitor pin where storage capacitor CSTC is charged by a constant current and limited to REF1; the VDD turn-on and turn-off thresholds are monitored here. |
| 4 | RIDD | passive | Current adjustment input; resistor RRIDD sets the STC charge current, with 13 kΩ to 80 kΩ recommended and VRIDD of 1.23 V to 1.33 V at RRIDD = 30 kΩ. |
| 5 | PF | output | Power-fail output that is high when VVB > VSTC + 0.6 V and goes low (power fail) to warn the microcontroller of a critical voltage drop so it can save data immediately. |
| 6 | SC | passive | Sampling capacitor pin that provides the dynamic reference level for comparator TC3, with a charge current of −15 µA to −40 µA. |
| 7 | TXI | output | Inverted data output; VOH is at least VBAT − 0.6 V at −100 µA and VOL is 0.5 V max at 100 µA. |
| 8 | TX | output | Noninverted data output that also repeats the receiver modulation as ECHO; VOH is at least VBAT − 0.6 V at −100 µA and VOL is 0.5 V max at 100 µA. |
| 9 | BAT | power_in | Logic level adjust input supplied from the battery, with 2.5 V to 3.8 V recommended and VBAT(max) ≤ VSTC − 1 V. |
| 10 | VS | power_out | Switch output for bus or battery supply, synchronized with VDD; VVS is at least VSTC − 0.4 V at IVS = −5 µA when VDD is on, and it drives an external transistor (BSS84) to switch to battery. |
| 11 | VDD | power_out | Voltage regulator output at 3.3 V nominal; VVDD is 3.1 V to 3.4 V at −IVDD = 1 mA with VSTC = 6.5 V. |
| 12 | RX | input | Noninverted data input that controls the slave-to-master current source CS3; VIH is up to 5.5 V only when VSTC ≥ 6.5 V and VIL is 0.8 V max. |
| 13 | RXI | input | Inverted data input that controls the slave-to-master current source CS3; VIH is up to 5.5 V only when VSTC ≥ 6.5 V and VIL is 0.8 V max. |
| 14 | RIS | passive | Adjust input for modulation current; programming resistor RRIS of at least 100 Ω sets the current, with VRIS of 1.4 V to 1.7 V at 100 Ω. |
| 15 | GND | power_in | Ground reference; all voltage values in the datasheet are measured with respect to this terminal. |
| 16 | BUSL1 | passive | Meter-Bus connection, polarity independent through the input rectifier bridge BR; bus voltage is 10.8 V to 42 V for the receiver and 12 V to 42 V for the transmitter. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-16 |
| Category | Logic |
| Pins | 16 |
CAD (KiCad official)
- Symbol:
TSS521DR - Footprint:
Package_SO:SOIC-16_3.9x9.9mm_P1.27mm - 3D model: SOIC-16 (KiCad packages3D, STEP)
- 3D model files:
tss521dr-etched.step/tss521dr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tss521dr.step/tss521dr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (15 pp, sha256
fa7ed42a397edb3a, retrieved 2026-10-08, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).