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UC3854BDWTR
Public Made by Adomby adom
Texas Instruments AC-DC Controllers And Regulators, SOIC-16-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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UC3854BDWTR
Texas Instruments · AC-DC Controllers And Regulators · SOIC-16-300mil
UC3854BDWTR from Texas Instruments, in a SOIC-16-300mil. 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 | GND | power_in | Ground reference for all device voltages; bypass and timing capacitors connected to GND should have leads as short and direct as possible. |
| 2 | PKLMT | input | Peak limit input with a threshold of 0.0 V, connected to the negative voltage on the current sense resistor, and a resistor to VREF can offset the negative sense signal up to GND. |
| 3 | CAO | output | Output of the wide-bandwidth current amplifier that commands the PWM to force the correct input current, and it can swing from 0.1 V to 7.5 V. |
| 4 | ISENSE | input | Inverting input to the current amplifier for switch current sensing, which remains functional down to and below GND but should not be taken below -0.5 V because it is diode-protected to GND. |
| 5 | MOUT | bidirectional | Multiplier output and non-inverting current amplifier input, a high-impedance current node where IMOUT must be kept at or below 2 × IAC and which should not be taken below -0.5 V. |
| 6 | IAC | input | Current input to the multiplier proportional to the instantaneous line voltage, regulated to a nominal 500 mV, with the maximum current at high line limited to 250 µA for best performance. |
| 7 | VAO | output | Voltage amplifier output, internally clamped to 6.0 V and used as the third input to the multiplier. |
| 8 | VRMS | input | Input providing the RMS voltage to the multiplier, with a linear operating range from 0 V to 5.5 V and an external divider that should produce 1.5 V at low line (85 VAC). |
| 9 | VREF | power_out | Internal reference output used to set the peak limit point and for various device functions, and this voltage must be present for the device to operate. |
| 10 | ENA | input | Enable input where a nominal voltage above 2.65 V allows operation and the device shuts off below 2.15 V nominal, with the input internally clamped to approximately 10 V. |
| 11 | VSENSE | input | Output voltage feedback input to the voltage error amplifier, whose output is another input to the multiplier. |
| 12 | RSET | input | Oscillator charging current and multiplier limit set pin, where a resistor from RSET to ground programs the oscillator charging current; input current is limited to 10 mA. |
| 13 | SS | input | Soft-start pin held at GND while the device is disabled or VCC is too low, pulled up over 3 V by an internal 14-µA current source when VCC is valid and the device is enabled, with a large capacitor to GND slowing the reference rise. |
| 14 | CT | input | Timing capacitor pin; a capacitor from CT to GND sets the PWM oscillator frequency. |
| 15 | VCC | power_in | Positive supply rail with an absolute maximum supply voltage of 22 V. |
| 16 | GTDRV | output | PWM output, a 1.5-A peak totem-pole MOSFET gate driver, which should use a series gate resistor of at least 5 Ω to limit overshoot into capacitive loads. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-16-300mil |
| Category | Power Management (PMIC) |
| Pins | 16 |
CAD (KiCad official)
- Symbol:
UC3854BDWTR - Footprint:
Package_SO:SOIC-16_3.9x9.9mm_P1.27mm - 3D model: SOIC-16-300mil (KiCad packages3D, STEP)
- 3D model files:
uc3854bdwtr-etched.step/uc3854bdwtr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);uc3854bdwtr.step/uc3854bdwtr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (29 pp, sha256
20dbe220bdb2dfe8, retrieved 2026-10-11, tier: lcsc) - 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).
# UC3854BDWTR
**Texas Instruments** · AC-DC Controllers And Regulators · SOIC-16-300mil
UC3854BDWTR from Texas Instruments, in a SOIC-16-300mil. 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 | GND | power_in | Ground reference for all device voltages; bypass and timing capacitors connected to GND should have leads as short and direct as possible. |
| 2 | PKLMT | input | Peak limit input with a threshold of 0.0 V, connected to the negative voltage on the current sense resistor, and a resistor to VREF can offset the negative sense signal up to GND. |
| 3 | CAO | output | Output of the wide-bandwidth current amplifier that commands the PWM to force the correct input current, and it can swing from 0.1 V to 7.5 V. |
| 4 | ISENSE | input | Inverting input to the current amplifier for switch current sensing, which remains functional down to and below GND but should not be taken below -0.5 V because it is diode-protected to GND. |
| 5 | MOUT | bidirectional | Multiplier output and non-inverting current amplifier input, a high-impedance current node where IMOUT must be kept at or below 2 × IAC and which should not be taken below -0.5 V. |
| 6 | IAC | input | Current input to the multiplier proportional to the instantaneous line voltage, regulated to a nominal 500 mV, with the maximum current at high line limited to 250 µA for best performance. |
| 7 | VAO | output | Voltage amplifier output, internally clamped to 6.0 V and used as the third input to the multiplier. |
| 8 | VRMS | input | Input providing the RMS voltage to the multiplier, with a linear operating range from 0 V to 5.5 V and an external divider that should produce 1.5 V at low line (85 VAC). |
| 9 | VREF | power_out | Internal reference output used to set the peak limit point and for various device functions, and this voltage must be present for the device to operate. |
| 10 | ENA | input | Enable input where a nominal voltage above 2.65 V allows operation and the device shuts off below 2.15 V nominal, with the input internally clamped to approximately 10 V. |
| 11 | VSENSE | input | Output voltage feedback input to the voltage error amplifier, whose output is another input to the multiplier. |
| 12 | RSET | input | Oscillator charging current and multiplier limit set pin, where a resistor from RSET to ground programs the oscillator charging current; input current is limited to 10 mA. |
| 13 | SS | input | Soft-start pin held at GND while the device is disabled or VCC is too low, pulled up over 3 V by an internal 14-µA current source when VCC is valid and the device is enabled, with a large capacitor to GND slowing the reference rise. |
| 14 | CT | input | Timing capacitor pin; a capacitor from CT to GND sets the PWM oscillator frequency. |
| 15 | VCC | power_in | Positive supply rail with an absolute maximum supply voltage of 22 V. |
| 16 | GTDRV | output | PWM output, a 1.5-A peak totem-pole MOSFET gate driver, which should use a series gate resistor of at least 5 Ω to limit overshoot into capacitive loads. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-16-300mil |
| Category | Power Management (PMIC) |
| Pins | 16 |
## CAD (KiCad official)
- Symbol: `UC3854BDWTR`
- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`
- 3D model: SOIC-16-300mil (KiCad packages3D, STEP)
- 3D model files: `uc3854bdwtr-etched.step` / `uc3854bdwtr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `uc3854bdwtr.step` / `uc3854bdwtr.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/uc3854b) (29 pp, sha256 `20dbe220bdb2dfe8`, retrieved 2026-10-11, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-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).
[Datasheet PDF](docs/uc3854bdwtr-datasheet.pdf)