# MP2161GJ-Z

**Monolithic Power Systems** · Global Sourcing Parts · TSOT-23-8

MP2161GJ-Z from Monolithic Power Systems, in a TSOT-23-8. 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 | PG | output | Power good indicator is an open-drain output with an internal pull-up to VIN, pulled high when FB is within 10% of the regulation level and low otherwise (sink 1mA at 0.4V maximum). |
| 2 | VIN | power_in | Supply voltage input for an unregulated +2.5V to +6V input, with C1 needed to prevent large voltage spikes at the input. |
| 3 | SW | output | Switch output (switching node) that must be kept short and away from the feedback network. |
| 4 | PGND | power_in | Power ground. |
| 5 | OUT | input | Input sense pin for the output voltage. |
| 6 | AGND | power_in | Analog ground for the internal control circuit. |
| 7 | FB | input | Feedback pin; an external resistor divider from the output to GND sets the output voltage, regulated to 0.6V. |
| 8 | EN | input | On/off control; the regulator is enabled when EN is pulled above 1.2V and disabled when floated or pulled to ground (EN input logic low is 0.4V maximum). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Monolithic Power Systems |
| Package | TSOT-23-8 |
| Category | Global Sourcing Parts |
| Pins | 8 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Feedback Voltage tolerance | VFB | -3 |  | 3 | % | 2.5V ≤ VIN ≤ 6V | 3 |
| Feedback Voltage tolerance over temperature | VFB | -3.5 |  | 3.5 | % | TA=-40°C to +85°C (note 6) | 3 |
| Switching frequency tolerance | Fs | -20 |  | 20 | % | VOUT=1.2V | 3 |
| Switching frequency tolerance over temperature | Fs | -25 |  | 25 | % | TA=-40°C to +85°C (note 6) | 3 |
| PFET Current Limit |  | 2.7 | 3.2 | 4 | A |  | 3 |
| Power Good Upper Trip Threshold | PGH |  |  | 10 | % | FB voltage respect to the regulation | 3 |
| Power Good Lower Trip Threshold | PGL | -10 |  |  | % | FB voltage respect to the regulation | 3 |
| Under Voltage Lockout Threshold Rising |  | 2.15 | 2.3 | 2.45 | V |  | 3 |
| Power Good Logic High Voltage | VPG-H | 4.9 |  |  | V | VIN=5V, VFB=0.6V | 3 |
| Power Good Sink Current Capability | VPG-L |  |  | 0.4 | V | Sink 1mA | 3 |
| EN Input Logic Low Voltage |  |  |  | 0.4 | V |  | 3 |
| EN Input Logic High Voltage |  | 1.2 |  |  | V |  | 3 |
| Feedback Current | IFB |  | 10 | 50 | nA | VFB = 0.6V | 3 |
| PFET Switch On Resistance | RDSON P |  |  | 100 | mΩ |  | 3 |
| NFET Switch On Resistance | RDSON N |  |  | 60 | mΩ |  | 3 |
| Switch Leakage |  |  | 0 | 1 | μA | VEN = 0V, VIN = 6V, VSW = 0V and 6V | 3 |
| Supply Current (Shutdown) |  |  | 20 | 100 | nA | VEN=0V, VIN=3V | 3 |
| Supply Current (Quiescent) |  |  | 17 | 20 | μA | VEN=2V, VFB=0.63V, VIN=5V | 3 |
| Feedback Voltage | VFB |  | 0.6 |  | V | 2.5V ≤ VIN ≤ 6V | 3 |
| ON Time (VIN=5V, VOUT=1.2V) | TON |  | 185 |  | ns | VIN=5V, VOUT=1.2V | 3 |
| ON Time (VIN=3.6V, VOUT=1.2V) | TON |  | 245 |  | ns | VIN=3.6V, VOUT=1.2V | 3 |
| Switching frequency | Fs |  | 1500 |  | kHz | VOUT=1.2V | 3 |
| Minimum Off Time | TMIN-OFF |  | 60 |  | ns |  | 3 |
| Soft-Start Time | TSS-ON |  | 1.5 |  | ms |  | 3 |
| Power Good Delay | PGD |  | 50 |  | μs |  | 3 |
| Power Good Internal Pull Up Resistor | RPG |  | 550 |  | kΩ |  | 3 |
| Under Voltage Lockout Threshold Hysteresis |  |  | 260 |  | mV |  | 3 |
| EN Input Current |  |  | 1.5 |  | μA | VEN=2V | 3 |
| EN Input Current |  |  | 0 |  | μA | VEN=0V | 3 |
| Thermal Shutdown |  |  | 150 |  | °C | Guaranteed by design (note 5) | 3 |
| Thermal Hysteresis |  |  | 30 |  | °C | Guaranteed by design (note 5) | 3 |
| Supply Voltage VIN | VIN |  |  | 6.5 | V |  | 2 |
| Switch voltage VSW | VSW | -0.3 |  | 6.5 | V | -1.5V for <20ns and -4V for <8ns; 10V for <10ns | 2 |
| All other pins voltage |  | -0.3 |  | 6.5 | V |  | 2 |
| Junction Temperature | TJ |  |  | 150 | °C |  | 2 |
| Lead Temperature |  |  |  | 260 | °C |  | 2 |
| Continuous Power Dissipation | PD |  |  | 1.25 | W | TA = +25°C (note 2) | 2 |
| Storage Temperature | TSTG | -65 |  | 150 | °C |  | 2 |
| Supply Voltage VIN (recommended) | VIN | 2.5 |  | 6 | V |  | 2 |
| Operating Junction Temperature | TJ | -40 |  | 125 | °C |  | 2 |
| Thermal resistance junction-to-ambient, TSOT23-8 | θJA |  | 100 |  | C/W | JESD51-7, 4-layer PCB (note 4) | 2 |
| Thermal resistance junction-to-case, TSOT23-8 | θJC |  | 55 |  | C/W | JESD51-7, 4-layer PCB (note 4) | 2 |

## CAD (KiCad official)

- Symbol: `MP2161GJ-Z`
- Footprint: `Package_TO_SOT_SMD:TSOT-23-8`
- 3D model: TSOT-23-8 (KiCad packages3D, STEP)
- 3D model files: `mp2161gj-z-etched.step` / `mp2161gj-z-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mp2161gj-z.step` / `mp2161gj-z.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Monolithic Power Systems datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586203235593949184) (13 pp, sha256 `19a8ec40abfbd933`, retrieved 2026-11-07, 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/mp2161gj-z-datasheet.pdf)