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TF21844-3BS
Public Made by Adomby adom
TFSS Gate Drivers, PDIP-14. 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
markdownTF21844-3BS
TFSS · Gate Drivers · PDIP-14
TF21844-3BS from TFSS, in a PDIP-14. 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 | IN | input | Logic input for high-side and low-side gate driver outputs (HO and LO), in phase with HO, referenced to VSS, with Schmitt trigger and internal pull-down. |
| 2 | SD* | input | Logic input for shutdown, referenced to VSS, enabled low. |
| 3 | VSS | power_in | Logic ground; logic supply offset voltage -5V to +5V relative to COM. |
| 4 | DT | passive | Programmable deadtime lead referenced to VSS; an external resistor sets dead time (about 400ns at RDT=0 ohm, 5us at 200k ohm). |
| 5 | COM | power_in | Low-side return. |
| 6 | LO | output | Low-side gate drive output, 1.4A source / 1.8A sink capability. |
| 7 | VCC | power_in | Low-side and logic fixed supply, 10V to 20V recommended operating range. |
| 8 | NC | unconnected | No connect. |
| 9 | NC | unconnected | No connect. |
| 10 | NC | unconnected | No connect. |
| 11 | VS | power_in | High-side floating supply return; operates up to 600V in bootstrap operation. |
| 12 | HO | output | High-side gate drive output, 1.4A source / 1.8A sink capability. |
| 13 | VB | power_in | High-side floating supply, VS+10V to VS+20V recommended, absolute maximum +624V. |
| 14 | NC | unconnected | No connect. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | TFSS |
| Package | PDIP-14 |
| Category | Motor Driver ICs |
| Pins | 14 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| VB High side floating supply voltage (absolute maximum) | VB | -0.3 | 624 | V | 3 | ||
| VCC Logic and low side fixed supply voltage (absolute maximum) | VCC | -0.3 | 24 | V | 3 | ||
| Offset supply voltage transient (absolute maximum) | dVS/dt | 50 | V/ns | 3 | |||
| VS High side floating supply offset voltage | VS | 600 | V | Logic operational for VS of -5V to 600V (NOTE3) | 3 | ||
| VCC Logic and low side fixed supply voltage | VCC | 10 | 20 | V | 3 | ||
| VLO Low side output voltage | VLO | 0 | V | 3 | |||
| VIN Logic input voltage (IN & SD*) | VIN | 5 | V | 3 | |||
| VSS Logic ground | VSS | -5 | 5 | V | 3 | ||
| TA Ambient temperature | TA | -40 | 125 | °C | 3 | ||
| TJ Junction operating temperature | TJ | 150 | °C | 3 | |||
| TL Lead temperature (soldering) | TL | 300 | °C | Soldering, 10s | 3 | ||
| Tstg Storage temperature range | Tstg | -55 | 150 | °C | 3 | ||
| Logic 1 input voltage for HO & logic 0 for LO | VIH | 2.5 | V | VCC = 10 V to 20 V | 4 | ||
| Logic 0 input voltage for HO & logic 1 for LO | VIL | 0.8 | V | 4 | |||
| SD* input positive going threshold | VSD, TH+ | 2.5 | V | 4 | |||
| SD* input negative going threshold | VSD, TH- | 0.8 | V | 4 | |||
| High level output voltage, VBIAS - VO | VOH | 1.4 | V | IO = 0A | 4 | ||
| Low level output voltage, VO | VOL | 0.2 | V | IO = 20mA | 4 | ||
| Offset supply leakage current | ILK | 50 | mA | VB = VS = 600V | 4 | ||
| Quiescent VBS supply current | IBSO | 20 | 60 | 150 | VIN = 0V or 5V | 4 | |
| Quiescent VCC supply current | ICCQ | 0.4 | 1 | 1.8 | mA | VIN = 0V or 5V | 4 |
| Logic 1 input bias current | IIN+ | 25 | 60 | IN = 5V, SD* = 0V | 4 | ||
| Logic 0 input bias current | IIN- | 1 | IN = 0V, SD* = 5V | 4 | |||
| VBS supply under-voltage positive going threshold | VBSUV+ | 8 | 8.9 | 9.8 | V | 4 | |
| VBS supply under-voltage negative going threshold | VBSUV- | 7.4 | 8.2 | 9 | V | 4 | |
| VCC supply under-voltage positive going threshold | VCCUV+ | 8 | 8.9 | 9.8 | V | 4 | |
| VCC supply under-voltage negative going threshold | VCCUV- | 7.4 | 8.2 | 9 | V | 4 | |
| Output high short circuit pulsed current | IO+ | 1.4 | 1.9 | A | VO = 0V, PW ≤ 10 ms | 4 | |
| Output low short circuit pulsed current | IO- | 1.7 | 2.3 | A | VO = 15V, PW ≤ 10 ms | 4 | |
| Turn-on propagation delay | tON | 680 | 900 | ns | VS = 0V | 5 | |
| Turn-off propagation delay | tOFF | 270 | 400 | ns | VS = 0 V or 600V | 5 | |
| Shut-down propagation delay | tSD | 180 | 270 | ns | 5 | ||
| ON delay matching, HS & LS turn-on | tDM ON | 90 | ns | 5 | |||
| OFF delay matching, HS & LS turn-off | tDM OFF | 40 | ns | 5 | |||
| Turn-on rise time | tr | 40 | 60 | ns | VS = 0V | 5 | |
| Turn-off fall time | tf | 20 | 35 | ns | 5 | ||
| Deadtime tDT LO-HO & tDT HO-LO | tDT | 280 | 400 | 520 | ns | RDT = 0W | 5 |
| Deadtime tDT LO-HO & tDT HO-LO | tDT | 4 | 5 | 6 | ms | RDT= 200kW | 5 |
| Deadtime matching tMDT = tDT LO-HO - tDT HO-LO | tMDT | 0 | 50 | ns | RDT = 0W | 5 | |
| Deadtime matching tMDT = tDT LO-HO - tDT HO-LO | tMDT | 0 | 600 | ns | RDT= 200kW | 5 |
CAD (KiCad official)
- Symbol:
TF21844-3BS - Footprint:
Package_DIP:DIP-14_W7.62mm - 3D model: PDIP-14 (KiCad packages3D, STEP)
- 3D model files:
tf21844-3bs-etched.step/tf21844-3bs-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tf21844-3bs.step/tf21844-3bs.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: TFSS datasheet (9 pp, sha256
e7b821c4d1eff14e, retrieved 2026-10-16, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-opus-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).