# BM14270AMUV-LBE2

**ROHM Semicon** · Current Sensors · VQFN-20(3.5x3.5)

BM14270AMUV-LBE2 from ROHM Semicon, in a VQFN-20(3.5x3.5). 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 | NC | unconnected | No connection; set to open. |
| 2 | NC | unconnected | No connection; set to open. |
| 3 | NC | unconnected | No connection; set to open. |
| 4 | NC | unconnected | No connection; set to open. |
| 5 | NC | unconnected | No connection; set to open. |
| 6 | NC | unconnected | No connection; set to open. |
| 7 | VDD | power_in | Power supply, operating range 2.7 V to 5.5 V (5.0 V typ); place a bypass capacitor between VDD and GND as close as possible to the IC. |
| 8 | GND | power_in | Ground reference for the device. |
| 9 | VREG | power_out | Internal regulator output; set a 0.22 μF bypass capacitor between VREG and GND as close as possible to the IC. |
| 10 | TEST | passive | Test pin; connect to GND. |
| 11 | NC | unconnected | No connection; set to open. |
| 12 | NC | unconnected | No connection; set to open. |
| 13 | NC | unconnected | No connection; set to open. |
| 14 | NC | unconnected | No connection; set to open. |
| 15 | NC | unconnected | No connection; set to open. |
| 16 | ALERT | output | ALERT output pin; when ALERT_EN=1 in CNTL2 it outputs the RD_DRDY data-ready signal. |
| 17 | SCL | input | I2C serial clock input; SCL clock frequency up to 400 kHz. |
| 18 | SDA | bidirectional | I2C serial data input/output. |
| 19 | ADDR | input | I2C programmable address bit; connect to VDD or GND to select slave address 0001111 (ADDR=H) or 0001110 (ADDR=L). |
| 20 | NC | unconnected | No connection; set to open. |
| 21 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ROHM Semicon |
| Package | VQFN-20(3.5x3.5) |
| Category | Sensors |
| 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 |
|---|---|---|---|---|---|---|---|
| Supply Voltage | VDD |  |  | 7 | V | Ta=25 °C | 4 |
| Storage Temperature Range | Tstg | -40 |  | 150 | °C | Ta=25 °C | 4 |
| Maximum Junction Temperature | Tjmax |  |  | 150 | °C | Ta=25 °C | 4 |
| Maximum Exposed Field | Mef | -1000 |  | 1000 | mT | Ta=25 °C | 4 |
| Supply Voltage | VDD | 2.7 | 5 | 5.5 | V |  | 5 |
| I2C Clock Frequency | fSCL |  |  | 400 | kHz |  | 5 |
| Operating Temperature | Topr | -40 | 25 | 125 | °C |  | 5 |
| Operating Average Current | IDD |  | 70 | 140 | µA | Output Data Rate = 20 SPS | 5 |
| Power Down Mode Current | ISS |  | 5 | 10 | µA | ALL Power Down | 5 |
| Low-level Input Current | IIL | -10 |  | 0 | µA | VIL = GND | 5 |
| High-level Input Current | IIH | 0 |  | 10 | µA | VIH = VDD | 5 |
| Measurable Range | RM | -280 |  | 280 | µT |  | 5 |
| Linearity | LIN |  | 0.5 | 2 | %FS |  | 5 |
| Output Offset | VOFS |  | 0 |  | LSB |  | 5 |
| Magnetic Sensitivity | DELTAV |  | 0.045 |  | µT/LSB |  | 5 |
| Measurement Time | tMS |  | 0.35 |  | ms |  | 5 |
| SCL Clock Frequency | fSCL | 0 |  | 400 | kHz |  | 8 |
| 'L' Period of the SCL Clock | tLOW | 1.3 |  |  | µs |  | 8 |
| 'H' Period of the SCL Clock | tHIGH | 0.6 |  |  | µs |  | 8 |
| Setup Time for Repeated START Condition | tSU;STA | 0.6 |  |  | µs |  | 8 |
| Hold Time (Repeated) START Condition | tHD;STA | 0.6 |  |  | µs |  | 8 |
| Data Setup Time | tSU;DAT | 100 |  |  | ns |  | 8 |
| Data Hold Time | tHD;DAT | 0 |  |  | µs |  | 8 |
| Setup Time for STOP Condition | tSU;STO | 0.6 |  |  | µs |  | 8 |
| Bus Free Time between a STOP and START Condition | tBUF | 1.3 |  |  | µs |  | 8 |
| Junction to Ambient (1s board, JESD51-3) | θJA |  | 181.9 |  | °C/W | 1s board (JESD51-3) | 4 |
| Junction to Ambient (2s2p board, JESD51-5, 7) | θJA |  | 50.5 |  | °C/W | 2s2p board (JESD51-5, 7) | 4 |
| Junction to Top Characterization Parameter (1s board, JESD51-3) | ΨJT |  | 19 |  | °C/W | 1s board (JESD51-3) | 4 |
| Junction to Top Characterization Parameter (2s2p board, JESD51-5, 7) | ΨJT |  | 7 |  | °C/W | 2s2p board (JESD51-5, 7) | 4 |

## CAD (KiCad official)

- Symbol: `BM14270AMUV-LBE2`
- Footprint: `Package_DFN_QFN:QFN-20-1EP_3.5x3.5mm_P0.5mm_EP2x2mm`
- 3D model: VQFN-20(3.5x3.5), generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 0.9 mm nominal QFN height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
- 3D model files: `bm14270amuv-lbe2-etched.step` / `bm14270amuv-lbe2-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bm14270amuv-lbe2.step` / `bm14270amuv-lbe2.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ROHM Semicon datasheet](docs/bm14270amuv-lbe2-datasheet.pdf) (23 pp, sha256 `6894921f4ef78520`, retrieved 2026-11-05, tier: manufacturer)
- **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/bm14270amuv-lbe2-datasheet.pdf)