# TPS25940ARVCT

**Texas Instruments** · Surge Suppressors · WQFN-20(4x3)

TPS25940ARVCT from Texas Instruments, in a WQFN-20(4x3). 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 | DEVSLP | input | Active-high DevSleep mode control that activates the low-power DevSleep mode; recommended input range is 0 to 18 V. |
| 2 | PGOOD | output | Active-high power-good output that goes high when PGTH crosses its threshold; open-drain, sink current limited to 10 mA, recommended range 0 to 18 V. |
| 3 | PGTH | input | Positive input of the PGOOD comparator; recommended input range is 0 to 18 V. |
| 4 | OUT | power_out | Power output of the device; recommended range 0 to 18 V, with 0.1 µF external capacitance listed for OUT. |
| 5 | OUT | power_out | Power output of the device; recommended range 0 to 18 V, with 0.1 µF external capacitance listed for OUT. |
| 6 | OUT | power_out | Power output of the device; recommended range 0 to 18 V, with 0.1 µF external capacitance listed for OUT. |
| 7 | OUT | power_out | Power output of the device; recommended range 0 to 18 V, with 0.1 µF external capacitance listed for OUT. |
| 8 | OUT | power_out | Power output of the device; recommended range 0 to 18 V, with 0.1 µF external capacitance listed for OUT. |
| 9 | IN | power_in | Power input and supply voltage of the device; recommended range 2.7 to 18 V, absolute maximum 20 V (22 V for 10 ms transients). |
| 10 | IN | power_in | Power input and supply voltage of the device; recommended range 2.7 to 18 V, absolute maximum 20 V (22 V for 10 ms transients). |
| 11 | IN | power_in | Power input and supply voltage of the device; recommended range 2.7 to 18 V, absolute maximum 20 V (22 V for 10 ms transients). |
| 12 | IN | power_in | Power input and supply voltage of the device; recommended range 2.7 to 18 V, absolute maximum 20 V (22 V for 10 ms transients). |
| 13 | IN | power_in | Power input and supply voltage of the device; recommended range 2.7 to 18 V, absolute maximum 20 V (22 V for 10 ms transients). |
| 14 | EN/UVLO | input | Sets the programmable undervoltage lockout threshold; an undervoltage event opens the internal FET and asserts FLT, and pulling it to GND resets the fault latch in TPS25940L; recommended range 0 to 18 V. |
| 15 | OVP | input | Sets the programmable overvoltage protection threshold; an overvoltage event opens the internal FET and asserts FLT; recommended range 0 to 18 V. |
| 16 | GND | power_in | Ground; must be connected to the exposed PowerPAD, which must be tied to a PCB ground plane using multiple vias. |
| 17 | ILIM | bidirectional | A resistor from this pin to GND sets the overload and short-circuit current limit; recommended resistance 16.9 kΩ to 150 kΩ and voltage 0 to 3 V. |
| 18 | dVdT | bidirectional | A capacitor from this pin to GND sets the output voltage ramp rate; recommended capacitance up to 470 nF, voltage 0 to 3 V, sink current limited to 10 mA. |
| 19 | IMON | output | Sources a scaled-down ratio of the internal FET current, which a resistor to GND converts to a proportional analog voltage; recommended range 0 to 6 V, absolute maximum 7 V. |
| 20 | FLT | output | Open-drain fault indicator that goes low for undervoltage, overvoltage, reverse voltage, or thermal shutdown events; recommended range 0 to 18 V, sink current limited to 10 mA. |
| 21 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | WQFN-20(4x3) |
| Category | TVS/Fuse/Board Level Protection |
| Pins | 21 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Input voltage range (IN, OUT, PGTH, PGOOD, EN/UVLO, OVP, DEVSLP, FLT) |  | -0.3 |  | 20 | V |  | 4 |
| IN input voltage, 10 ms transient |  |  |  | 22 | V | 10 ms transient | 4 |
| Input voltage range (dVdT, ILIM) |  | -0.3 |  | 3.6 | V |  | 4 |
| Input voltage range (IMON) |  | -0.3 |  | 7 | V |  | 4 |
| Sink current (PGOOD, FLT, dVdT) |  |  |  | 10 | mA | PGOOD, FLT, dVdT | 4 |
| Maximum junction temperature TJ | TJ | -40 |  | 150 | °C |  | 4 |
| Input voltage range IN |  | 2.7 |  | 18 | V |  | 4 |
| Input voltage range (EN/UVLO, OVP, DEVSLP, OUT, PGTH, PGOOD, FLT) |  | 0 |  | 18 | V |  | 4 |
| Input voltage range (dVdT, ILIM) |  | 0 |  | 3 | V |  | 4 |
| Input voltage range (IMON) |  | 0 |  | 6 | V |  | 4 |
| Resistance ILIM |  | 16.9 |  | 150 | kΩ |  | 4 |
| External capacitance OUT |  | 0.1 |  |  | µF |  | 4 |
| External capacitance dVdT |  |  |  | 470 | nF |  | 4 |
| Operating junction temperature range TJ | TJ | -40 | 25 | 125 | °C |  | 4 |
| Input voltage range V(IN) operating | V(IN) | 2.7 |  | 18 | V |  | 6 |
| Internal UVLO threshold, rising | V(UVR) | 2.2 | 2.3 | 2.4 | V |  | 6 |
| Supply current, enabled | IQ(ON) | 140 | 210 | 300 | µA | V(EN/UVLO) = 2 V, V(IN) = 3 V | 6 |
| Supply current, enabled | IQ(ON) | 140 | 199 | 260 | µA | V(EN/UVLO) = 2 V, V(IN) = 12 V | 6 |
| Supply current, enabled | IQ(ON) | 140 | 202 | 270 | µA | V(EN/UVLO) = 2 V, V(IN) = 18 V | 6 |
| Supply current, disabled | IQ(OFF) | 4 | 8.6 | 15 | µA | V(EN/UVLO) = 0 V, V(IN) = 3 V | 6 |
| Supply current, disabled | IQ(OFF) | 6 | 15 | 20 | µA | V(EN/UVLO) = 0 V, V(IN) = 12 V | 6 |
| Supply current, disabled | IQ(OFF) | 8 | 18.5 | 25 | µA | V(EN/UVLO) = 0 V, V(IN) = 18 V | 6 |
| Supply current, DevSleep mode | IQ(DEVSLP) | 70 | 95 | 130 | µA | V(DEVSLP) = 0 V, V(IN) = 2.7V to 18V | 6 |
| EN/UVLO threshold voltage, rising | V(ENR) | 0.97 | 0.99 | 1.01 | V |  | 6 |
| EN/UVLO threshold voltage, falling | V(ENF) | 0.9 | 0.92 | 0.94 | V |  | 6 |
| Overvoltage threshold voltage, rising | V(OVPR) | 0.97 | 0.99 | 1.01 | V |  | 6 |
| Overvoltage threshold voltage, falling | V(OVPF) | 0.9 | 0.92 | 0.94 | V |  | 6 |
| DEVSLP threshold voltage, rising | V(DEVSLPR) | 1.6 | 1.85 | 2 | V |  | 6 |
| DEVSLP threshold voltage, falling | V(DEVSLPF) | 0.8 | 0.96 | 1.1 | V |  | 6 |
| dVdT charging current | I(dVdT) | 0.85 | 1 | 1.15 | µA | V(dVdT) = 0 V | 6 |
| dVdT discharging resistance | R(dVdT) | 16 |  | 24 | Ω | EN/UVLO = 0 V, I(dVdT) = 10 mA sinking | 6 |
| dVdT maximum capacitor voltage | V(dVdTmax) | 2.6 | 2.88 | 3.1 | V |  | 6 |
| dVdT to OUT gain | GAIN(dVdT) | 11.65 | 11.9 | 12.05 | V/V |  | 6 |
| Current limit I(LIM) | I(LIM) | 0.53 | 0.58 | 0.63 | A | R(ILIM) = 150 kΩ, (V(IN) - V(OUT)) = 1 V | 6 |
| Current limit I(LIM) | I(LIM) | 0.9 | 0.99 | 1.07 | A | R(ILIM) = 88.7 kΩ, (V(IN) - V(OUT)) = 1 V | 6 |
| Current limit I(LIM) | I(LIM) | 1.92 | 2.08 | 2.25 | A | R(ILIM) = 42.2 kΩ, (V(IN) - V(OUT)) = 1 V | 6 |
| Current limit I(LIM) | I(LIM) | 3.25 | 3.53 | 3.81 | A | R(ILIM) = 24.9 kΩ, (V(IN) - V(OUT)) = 1 V | 6 |
| Current limit I(LIM) | I(LIM) | 4.78 | 5.2 | 5.62 | A | R(ILIM) = 16.9 kΩ, (V(IN) - V(OUT)) = 1 V | 6 |
| DevSleep mode current limit | I(DEVSLP(LIM)) | 0.55 | 0.67 | 0.8 | A |  | 6 |
| Short-circuit current limit IOS | IOS | 1.91 | 2.07 | 2.24 | A | R(ILIM) = 42.2 kΩ, V(VIN) = 12 V, (V(IN) -V(OUT)) = 5 V | 7 |
| Short-circuit current limit IOS | IOS | 3.21 | 3.49 | 3.77 | A | R(ILIM) = 24.9 kΩ, V(VIN) = 12 V, (V(IN) -V(OUT)) = 5 V | 7 |
| Short-circuit current limit IOS | IOS | 4.7 | 5.11 | 5.52 | A | R(ILIM) = 16.9 kΩ, V(VIN) = 12 V, (V(IN) -V(OUT)) = 5 V, -40°C ≤ TJ ≤ 85°C | 7 |
| Gain factor I(IMON):I(OUT) | GAIN(IMON) | 47.78 | 52.3 | 57.23 | µA/A | 1 A ≤ I(OUT) ≤ 5 A | 7 |
| IN to OUT ON resistance RON | RON | 34 | 42 | 49 | mΩ | 1 A ≤ I(OUT) ≤ 5 A, TJ = 25°C | 7 |
| IN to OUT ON resistance RON | RON | 26 | 42 | 58 | mΩ | 1 A ≤ I(OUT) ≤ 5 A, -40°C ≤ TJ ≤ 85°C | 7 |
| IN to OUT ON resistance RON | RON | 26 | 42 | 64 | mΩ | 1 A ≤ I(OUT) ≤ 5 A, -40°C ≤ TJ ≤ 125°C | 7 |
| OUT leakage current in off state, sourcing | Ilkg(OUT) | -2 | 0 | 2 | µA | V(IN) = 18 V, V(EN/UVLO) = 0 V, V(OUT) = 0 V (Sourcing) | 7 |
| OUT leakage current in off state, sinking | Ilkg(OUT) | 6 | 13 | 20 | µA | V(IN) = 2.7 V, V(EN/UVLO) = 0 V, V(OUT) = 18 V (Sinking) | 7 |
| V(IN) - V(OUT) threshold for reverse protection comparator, falling | V(REVTH) | -15 | -9.3 | -3 | mV |  | 7 |
| V(IN) - V(OUT) threshold for reverse protection comparator, rising | V(FWDTH) | 86 | 100 | 114 | mV |  | 7 |
| FLT internal pull-down resistance | R(FLT) | 10 | 18 | 30 | Ω | V(OVP) = 2 V, I(FLT) = 5 mA sinking | 7 |
| PGTH threshold voltage, rising | V(PGTHR) | 0.97 | 0.99 | 1.01 | V |  | 7 |
| PGTH threshold voltage, falling | V(PGTHF) | 0.9 | 0.92 | 0.94 | V |  | 7 |
| PGOOD internal pull-down resistance | R(PGOOD) | 10 | 20 | 35 | Ω | V(PGTH) = 0V, I(PGOOD) = 5 mA sinking | 7 |
| Output ramp time | tdVdT | 0.25 | 0.37 | 0.5 | ms | EN/UVLO ↑ to V(OUT) = 11 V, with C(dVdT) = open | 8 |
| PGOOD delay (de-glitch) time, rising edge | tPGOODR | 0.42 | 0.54 | 0.66 | ms | Rising edge | 8 |
| Junction-to-ambient thermal resistance | RθJA |  | 38.1 |  | °C/W |  | 5 |
| Junction-to-case (top) thermal resistance | RθJCtop |  | 40.5 |  | °C/W |  | 5 |
| Junction-to-board thermal resistance | RθJB |  | 13.6 |  | °C/W |  | 5 |
| Junction-to-case (bottom) thermal resistance | RθJCbot |  | 3.4 |  | °C/W |  | 5 |

## CAD (KiCad official)

- Symbol: `TPS25940ARVCT`
- Footprint: `Package_DFN_QFN:QFN-20-1EP_3x4mm_P0.5mm_EP1.65x2.65mm`
- 3D model: WQFN-20(4x3) (KiCad packages3D, STEP)

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/tps25940arvct.pdf) (46 pp, sha256 `2afef30f449360cd`, retrieved 2026-10-30, tier: manufacturer)
- **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-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/tps25940arvct-datasheet.pdf)