# HE9459M6R

**HEERMICR** · DC-DC Converters · SOT-23-6

HE9459M6R from HEERMICR, in a SOT-23-6. 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 | BST | passive | A capacitor connected between SW and BST is required to form a floating supply across the high-side switch driver. |
| 2 | GND | power_in | Ground pin of the device. |
| 3 | FB | input | Adjustable-version feedback input; connect FB to the center point of the external resistor divider. |
| 4 | EN | input | Drive to a logic-high to enable the IC and to a logic-low to disable it and enter micro-power shutdown mode. |
| 5 | IN | power_in | Power supply pin; the electrical characteristics give an input voltage range of 4.5V to 55V. |
| 6 | SW | power_out | Switching pin that drives the external inductor and is referenced to the BST capacitor; SW voltage is rated -0.3V to (VIN+0.5V). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HEERMICR |
| Package | SOT-23-6 |
| Category | Power Management (PMIC) |
| Pins | 6 |

## 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 |  | 4.5 |  | 55 | V |  | 4 |
| Supply Current (Quiescent) |  |  |  | 2 | mA | VEN =3.0V | 4 |
| Supply Current (Shutdown) |  |  |  | 4 | uA | VEN =0 or EN = GND | 4 |
| EN Rising Threshold |  | 1.5 |  |  | V |  | 4 |
| EN Falling Threshold |  |  |  | 0.6 | V |  | 4 |
| Under-Voltage Lockout Threshold Wake up VIN Voltage |  |  |  | 4.8 | V |  | 4 |
| Under-Voltage Lockout Threshold Shutdown VIN Voltage |  | 3.5 |  |  | V |  | 4 |
| Vin,EN Voltage | Vin, EN | -0.3 |  | 65 | V |  | 4 |
| FB Voltages |  | -0.3 |  | 6 | V |  | 4 |
| SW Voltage |  | -0.3 |  |  | V | maximum printed as (VIN+0.5V) | 4 |
| BS Voltage |  | -0.3 |  | 5 | V | relative to SW pin: (Vsw-0.3) to (Vsw+5V) | 4 |
| Operating Temperature Range |  | -40 |  | 85 | ℃ |  | 4 |
| Lead Temperature (Soldering, 10s) |  |  |  | 260 | ℃ | soldering, 10s | 4 |
| Storage Temperature Range |  | -55 |  | 150 | ℃ |  | 4 |
| Feedback Voltage | VFB |  | 0.8 |  | V |  | 4 |
| Upper Switch Current Limit |  |  | 1.5 |  | A |  | 4 |
| Switching Frequency |  |  | 1.5 |  | MHz |  | 4 |
| Maximum Duty Cycle |  |  | 98 |  | % | VFB=90% | 4 |
| Soft Start |  |  | 0.85 |  | mS |  | 4 |
| Switch On-Resistance |  |  | 800 |  | mΩ |  | 4 |
| Minimum On-Time |  |  | 100 |  | nS |  | 4 |
| Thermal Shutdown |  |  | 160 |  | ℃ |  | 4 |
| Thermal Hysteresis |  |  | 30 |  | ℃ |  | 4 |
| Thermal Resistance (θJA) | θJA |  | 160 |  | ℃/W |  | 4 |

## CAD (KiCad official)

- Symbol: `HE9459M6R`
- Footprint: `Package_TO_SOT_SMD:SOT-23-6`
- 3D model: SOT-23-6 (KiCad packages3D, STEP)
- 3D model files: `he9459m6r-etched.step` / `he9459m6r-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `he9459m6r.step` / `he9459m6r.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [HEERMICR datasheet](docs/he9459m6r-datasheet.pdf) (12 pp, sha256 `5cc93c667e50ce87`, retrieved 2026-11-04, 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/he9459m6r-datasheet.pdf)