# XC9142B50CMR-G

**Torex Semicon** · DC-DC Converters · SOT-25-5

XC9142B50CMR-G from Torex Semicon, in a SOT-25-5. 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 | CE | input | Chip enable input: H = active, L = stand-by; it is a CMOS input that must not be left open, and the CE voltage range is -0.3 to +7.0 V. |
| 2 | GND | power_in | Ground, the reference voltage for all other voltages; use a thick ground trace with sufficient strength. |
| 3 | BAT | power_in | Power input with an input voltage range of 0.65 V to 6.0 V (absolute maximum -0.3 to +7.0 V); place the input bypass capacitor CIN close to this pin. |
| 4 | VOUT | power_out | Output voltage pin (fixed 1.8 V to 5.5 V, absolute maximum -0.3 to +7.0 V); on type B the input is bypassed to the output at stand-by, so it must not be connected to another supply. |
| 5 | Lx | passive | Switching node connected to the external inductor, with a voltage range of -0.3 to +7.0 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Torex Semicon |
| Package | SOT-25-5 |
| Category | Power Supply Chip |
| Pins | 5 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Output Voltage | VOUT | 4.9 | 5 | 5.1 | V | Voltage to start oscillation while VOUT=VOUT(T)x1.03→VOUT(T)x0.97; Ta=25℃ | 9 |
| Input Voltage | VBAT |  |  | 6 | V |  | 7 |
| Operation Start Voltage | VST1 |  |  | 0.9 | V | RL=1kΩ | 7 |
| Operation Hold Voltage | VHLD |  | 0.65 |  | V | RL=1kΩ | 7 |
| Quiescent Current (XC9142) | Iq |  | 17 | 30 | μA | VOUT=VBAT=VOUT(T)+0.5V, fOSC=1.2MHz | 7 |
| Oscillation Frequency | fOSC | 1.02 | 1.2 | 1.38 | MHz | VBAT=VOUT(T)x0.5, IOUT=100mA, fOSC=1.2MHz | 7 |
| Maximum Duty Cycle | DMAX | 85 | 93 | 98 | % | VBAT=1.2V, VOUT=VOUT(T)-0.2V, fOSC=1.2MHz | 7 |
| Minimum Duty Cycle | DMIN |  |  | 0 | % | VOUT=VBAT=VOUT(T)+0.5V | 7 |
| PFM Switching Current | IPFM |  | 165 | 230 | mA | VBAT=1.5V, RL selected with VOUT(T), Table 1 | 7 |
| Efficiency (XC9142) | EFFI |  | 86 |  | % | VBAT=VOUT(T)x0.6, RL selected with VOUT(T), Table 1; designed value | 7 |
| Efficiency | EFFI |  | 90 |  | % | VBAT=VOUT(T)x0.6, IOUT=100mA; designed value | 7 |
| Stand-by Current (A,B,D,E type) | ISTB |  | 0 | 1 | μA | VBAT=VLx=6.0V, VCE=0.0V, VOUT=OPEN (B type) | 7 |
| Lx SW Pch ON Resistance | RLXP |  | 0.3 |  | Ω | VBAT=VLx=6.0V, IOUT=200mA | 7 |
| Lx SW Nch ON Resistance | RLXN |  | 0.3 |  | Ω | designed value | 7 |
| Lx SW H Leakage Current (A,B,D,E type) | ILXLH |  | 0 | 1 | μA | VBAT=6.0V, VCE=0.0V, VLx=6.0V, VOUT=OPEN | 7 |
| Current Limit | ILIM | 1.07 | 1.3 | 2.3 | A | VBAT=VOUT(T)-0.2V, RLx=1Ω | 9 |
| Soft-Start Time | tSS | 0.6 | 1 | 2.5 | ms | VBAT=VOUT(T)x0.6, VOUT=VOUT(T)x0.9, fOSC=1.2MHz | 8 |
| Bypass SW Resistance (B Type) | RBSW | 100 | 180 | 400 | Ω | VBAT=3.3V, VOUT=0.0V, VCE=0.0V | 8 |
| CE H Voltage | VCEH | 0.8 |  | 6 | V | VOUT=VOUT(T)-0.15V, voltage changes Lx to be generated | 8 |
| CE L Voltage | VCEL |  |  | 0.2 | V | VOUT=VOUT(T)-0.15V, voltage changes Lx to H level; min printed as GND | 8 |
| CE H Current | ICEH | -0.1 |  | 0.1 | μA | VBAT=6.0V, VOUT=6.0V, VLx=6.0V, VCE=6.0V | 8 |
| CE L Current | ICEL | -0.1 |  | 0.1 | μA | VBAT=6.0V, VOUT=6.0V, VLx=6.0V, VCE=0.0V | 8 |
| BAT Pin Voltage | VBAT | -0.3 |  | 7 | V | Ta=25℃ | 6 |
| Lx Pin Voltage | VLx | -0.3 |  | 7 | V | Ta=25℃ | 6 |
| VOUT Pin Voltage | VOUT | -0.3 |  | 7 | V | Ta=25℃ | 6 |
| CE Pin Voltage | VCE | -0.3 |  | 7 | V | Ta=25℃ | 6 |
| Power Dissipation SOT-25 | Pd |  |  | 600 | mW | PCB mounted, Ta=25℃ | 6 |
| Operating Ambient Temperature | Topr | -40 |  | 85 | ℃ |  | 6 |
| Storage Temperature | Tstg | -55 |  | 125 | ℃ |  | 6 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts |  | tin | 6-2. Sn-AG-Cu is used for the package terminals. If eutectic solder is used, mounting reliability is decreased. Please do not use eutectic solder paste. | 16 |

## CAD (KiCad official)

- Symbol: `XC9142B50CMR-G`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-25-5 (KiCad packages3D, STEP)
- 3D model files: `xc9142b50cmr-g-etched.step` / `xc9142b50cmr-g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `xc9142b50cmr-g.step` / `xc9142b50cmr-g.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Torex Semicon datasheet](docs/xc9142b50cmr-g-datasheet.pdf) (34 pp, sha256 `cac21233c885a026`, retrieved 2026-10-27, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/xc9142b50cmr-g-datasheet.pdf)