UC2845AD8TR

Texas Instruments · AC-DC Controllers And Regulators · SOIC-8

UC2845AD8TR from Texas Instruments, in a SOIC-8. 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	COMP	output	Low-impedance 1MHz internal error amplifier output, also peak current limiting or PWM comparator input with 80dB open-loop gain (AVOL); maximum sink current 6mA, internally unprotected.
2	FB	input	Error amplifier input for controlling power converter voltage feedback loop to achieve stability.
3	ISENSE	input	Peak current limiting or PWM comparator input; when used with current sensing resistor, error amplifier output controls cycle-by-cycle peak current limiting of power system; maximum peak current sensing signal internally clamped to 1V.
4	RT/CT	input	Internal oscillator input, programmed with external timing resistor (RT) and timing capacitor (CT); recommended capacitor 470pF to 4.7nF, timing resistor 5kΩ to 100kΩ.
5	GND	power_in	Controller signal ground.
6	OUTPUT	output	1A totem pole gate driver output; can source/sink up to 1A of gate driver current; gate driver resistor required to limit current.
7	VCC	power_in	Gate driver bias input; requires bypass capacitor with capacitance at least 10 times larger than main switch FET gate capacitance.
8	VREF	power_in	Reference voltage output of PWM controller; must supply current not exceeding 10mA during normal operation; short-circuit protected at approximately 100mA; requires 1µF high-frequency bypass capacitor and VCC capacitor at least 10 times larger than VREF capacitor.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	SOIC-8
Category	Power Management (PMIC)
Pins	8

CAD (KiCad official)

Symbol: UC2845AD8TR
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)
3D model files: uc2845ad8tr-etched.step / uc2845ad8tr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); uc2845ad8tr.step / uc2845ad8tr.glb are the bare package body.

Provenance

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

Datasheet: Texas Instruments datasheet (54 pp, sha256 1f5ad8805f414728, retrieved 2026-10-07, tier: lcsc)
Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-4-5-20251001 (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

# UC2845AD8TR

**Texas Instruments** · AC-DC Controllers And Regulators · SOIC-8

UC2845AD8TR from Texas Instruments, in a SOIC-8. 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 | COMP | output | Low-impedance 1MHz internal error amplifier output, also peak current limiting or PWM comparator input with 80dB open-loop gain (AVOL); maximum sink current 6mA, internally unprotected. |
| 2 | FB | input | Error amplifier input for controlling power converter voltage feedback loop to achieve stability. |
| 3 | ISENSE | input | Peak current limiting or PWM comparator input; when used with current sensing resistor, error amplifier output controls cycle-by-cycle peak current limiting of power system; maximum peak current sensing signal internally clamped to 1V. |
| 4 | RT/CT | input | Internal oscillator input, programmed with external timing resistor (RT) and timing capacitor (CT); recommended capacitor 470pF to 4.7nF, timing resistor 5kΩ to 100kΩ. |
| 5 | GND | power_in | Controller signal ground. |
| 6 | OUTPUT | output | 1A totem pole gate driver output; can source/sink up to 1A of gate driver current; gate driver resistor required to limit current. |
| 7 | VCC | power_in | Gate driver bias input; requires bypass capacitor with capacitance at least 10 times larger than main switch FET gate capacitance. |
| 8 | VREF | power_in | Reference voltage output of PWM controller; must supply current not exceeding 10mA during normal operation; short-circuit protected at approximately 100mA; requires 1µF high-frequency bypass capacitor and VCC capacitor at least 10 times larger than VREF capacitor. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `UC2845AD8TR`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `uc2845ad8tr-etched.step` / `uc2845ad8tr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `uc2845ad8tr.step` / `uc2845ad8tr.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/uc2845a) (54 pp, sha256 `1f5ad8805f414728`, retrieved 2026-10-07, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-4-5-20251001` (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/uc2845ad8tr-datasheet.pdf)