component
UC3825DWTR
Public Made by Adomby adom
Texas Instruments AC-DC Controllers And Regulators, SOIC-16-300mil. Datasheet-verified pinout, 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
markdownUC3825DWTR
Texas Instruments · AC-DC Controllers And Regulators · SOIC-16-300mil
UC3825DWTR from Texas Instruments, in a SOIC-16-300mil. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | INV | input | Inverting input to the wide-bandwidth error amplifier (voltage feedback input); rated as an analog input from -0.3V to 7V absolute maximum, with 10-15mV input offset voltage and up to 3µA input bias current. |
| 2 | NI | input | Noninverting input to the error amplifier; rated as an analog input from -0.3V to 7V absolute maximum, used together with INV for closed-loop voltage/current-mode compensation. |
| 3 | E/A Out | output | Error amplifier output / PWM comparator input node; output current limited to 5mA absolute maximum, sink current 1-2.5mA, source current -0.5 to -1.3mA, output high 4.0-5.0V and output low 0-1.0V. |
| 4 | Clock | output | Oscillator clock output used for synchronizing multiple devices; output current limited to -5mA absolute maximum, with Clock-Out-High of 3.9-4.5V and Clock-Out-Low of 2.3-2.9V. |
| 5 | RT | passive | Oscillator timing-resistor pin that sets the oscillator charging current together with CT; rated as an analog input from -0.3V to 7V with oscillator charging current limited to -5mA absolute maximum. |
| 6 | CT | passive | Oscillator timing-capacitor pin whose external capacitor together with RT sets the oscillator frequency; rated as an analog input from -0.3V to 6V absolute maximum. |
| 7 | Ramp | input | PWM comparator ramp/current-sense input compared against the E/A Out signal; bias current -1 to -5µA, analog input range -0.3V to 6V, with 50-80ns delay to output. |
| 8 | Soft Start | passive | Soft-start / maximum duty-cycle clamp pin for an external timing capacitor; charge current 3-9-20µA, discharge current up to 1mA typical, and sink current limited to 20mA absolute maximum, analog voltage range -0.3V to 6V. |
| 9 | ILIM/SD | input | TTL-compatible current-limit and shutdown input; current-limit threshold 0.9-1.1V, shutdown threshold 1.25-1.55V, bias current up to 15µA (10µA UC3825), delay to output 50-80ns, analog voltage range -0.3V to 6V absolute maximum. |
| 10 | Gnd | power_in | Analog signal ground reference for the control circuitry, separate from the power output ground (Pwr Gnd) to minimize switching noise coupling. |
| 11 | Out A | output | High-current totem-pole output A capable of 1.5A peak source/sink; DC current limited to 0.5A and pulse current to 2.0A (0.5µs) absolute maximum, output low 0.25-2.2V and output high 12.0-13.5V depending on load, rise/fall time 30-60ns into 1nF. |
| 12 | Pwr Gnd | power_in | Power ground return for the high-current totem-pole output stages, kept separate from analog Gnd to reduce switching noise injection into the control circuitry. |
| 13 | VC | power_in | Supply voltage pin for the output totem-pole driver stages; absolute maximum rating of 30V, intended to be bypassed with a 0.1µF low-ESL ceramic capacitor close to the pin. |
| 14 | Out B | output | High-current totem-pole output B, identical ratings to Out A: 1.5A peak, 0.5A DC, 2.0A pulse (0.5µs) absolute maximum, with matching output-low/output-high and rise/fall-time specifications. |
| 15 | VCC | power_in | Main chip supply voltage input, absolute maximum 30V; under-voltage lockout start threshold 8.8-9.6V with 0.4-1.2V hysteresis, start-up current 1.1-2.5mA at VCC=8V, and operating supply current ICC of 22-33mA. |
| 16 | VREF | power_out | Precision 5.1V reference output (5.00-5.20V total variation for UC3825) rated for IO up to 10mA load regulation testing, with short-circuit current of -15 to -100mA; used to bias external circuitry and set UVLO thresholds. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-16-300mil |
| Category | Power Management (PMIC) |
| Pins | 16 |
CAD (KiCad official)
- Symbol:
UC3825DWTR - Footprint:
Package_SO:SOIC-16_3.9x9.9mm_P1.27mm - 3D model: SOIC-16-300mil (KiCad packages3D, STEP)
- 3D model files:
uc3825dwtr-etched.step/uc3825dwtr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);uc3825dwtr.step/uc3825dwtr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (23 pp, sha256
62f4a96c2122b13d, retrieved 2026-09-23, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-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).