component
BD9G341AEFJ-E2
Public Made by Adomby adom
ROHM Semicon DC-DC Converters, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownBD9G341AEFJ-E2
ROHM Semicon · DC-DC Converters · SOIC-8
BD9G341AEFJ-E2 from ROHM Semicon, in a SOIC-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 | LX | output | Switching node of the buck converter, to be placed as close as possible to the Schottky barrier diode and inductor; LX to GND absolute maximum is 80 V. |
| 2 | GND | power_in | Ground pin; the GND pattern is kept separate from the input-capacitor-to-output-capacitor current loop. The thermal pad is also connected to GND. |
| 3 | VC | passive | Output of the internal error amplifier, where the phase compensation network is connected between this pin and GND; absolute maximum rating is 7 V. |
| 4 | FB | input | Voltage feedback input to the error amplifier, regulated to 1.0 V DC; absolute maximum rating is 7 V. |
| 5 | RT | passive | Internal oscillator frequency set pin, with a single resistor to GND; recommended frequency range is 50 kHz to 750 kHz (47 kΩ gives 200 kHz), and absolute maximum rating is 7 V. |
| 6 | EN | input | Shutdown and enable pin: below 1.3 V the regulator is in low-power state, 1.3 V to 2.4 V gives standby, and above 2.6 V the regulator is operational; EN to GND absolute maximum is 80 V. |
| 7 | BST | passive | Boost input for the bootstrap capacitor, which is connected between BST and LX; a 0.1 µF ceramic capacitor is recommended. |
| 8 | VCC | power_in | Input supply voltage pin; recommended power supply voltage range is 12 V to 76 V (absolute maximum 80 V). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | ROHM Semicon |
| Package | SOIC-8 |
| Category | Power Management (PMIC) |
| 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 |
|---|---|---|---|---|---|---|---|
| Stand-by current of VCC | Ist | 0 | 10 | µA | VEN=0V | 6 | |
| Circuit current of VCC | Icc | 1.5 | 2 | mA | FB=1.5V | 6 | |
| Detect Voltage (UVLO) | Vccuv | 10.4 | 11 | 11.6 | V | 6 | |
| Hysteresis width (UVLO) | Vuvhy | 200 | 300 | mV | 6 | ||
| FB threshold voltage | VFBN | 0.985 | 1 | 1.015 | V | Ta=25°C | 6 |
| FB threshold voltage | VFBA | 0.98 | 1 | 1.02 | V | Ta=-40 to 85°C | 6 |
| FB Input bias current | IFB | -1 | 0 | 1 | uA | VFB=2.0V | 6 |
| VC source current | Isource | 15 | 40 | 65 | uA | 6 | |
| VC sink current | Isink | -65 | -40 | -15 | uA | 6 | |
| Soft start time | Tsoft | 15 | 20 | 25 | msec | 6 | |
| Detect current (OCP) | Iocp | 3.5 | 6 | A | 6 | ||
| OCP latch hold time | TOCP | 15 | 20 | 25 | msec | 6 | |
| EN Pin inner REG on voltage | VENON | 1.3 | 2.4 | V | 6 | ||
| EN Pin IC output on threshold | Venuv | 2.52 | 2.6 | 2.68 | V | IC on or off threshold | 6 |
| EN Pin current | IEN | 9 | 10 | 11 | µA | VEN=3V | 6 |
| Oscillator frequency | Fosc | 180 | 200 | 220 | kHz | RTR=47kΩ | 6 |
| Forced off time | Toff | 500 | nsec | 6 | |||
| Power Supply Voltage | VCC | 12 | 76 | V | Ta=25°C | 5 | |
| Output voltage | VOUT | 1 | V | Ta=25°C; max printed as VCC (Note7) | 5 | ||
| Output current | IOUT | 3 | A | Ta=25°C | 5 | ||
| Oscillator frequency | Fosc | 50 | 750 | kHz | Ta=25°C | 5 | |
| Maximum input voltage | VCC | 80 | V | 5 | |||
| BST to GND | VBST | 85 | V | 5 | |||
| Maximum input current | Imax | 3.5 | A | 5 | |||
| BST to LX | ⊿VBST | 15 | V | 5 | |||
| EN to GND | VEN | 80 | V | 5 | |||
| LX to GND | VLX | 80 | V | 5 | |||
| VC to GND | VVC | 7 | V | 5 | |||
| FB to GND | VFB | 7 | V | 5 | |||
| RT to GND | VRT | 7 | V | 5 | |||
| Operating Temperature | Topr | -40 | 85 | °C | 5 | ||
| Storage Temperature | Tstg | -55 | 150 | °C | 5 | ||
| Junction Temperature | Tjmax | 150 | °C | 5 | |||
| Junction to Ambient (HTSOP-J8) | θJA | 125.3 | °C/W | 1s board (JESD51-3) | 5 | ||
| Junction to Ambient (HTSOP-J8) | θJA | 27.6 | °C/W | 2s2p board (JESD51-5, 7) | 5 | ||
| Junction to Top Characterization Parameter (HTSOP-J8) | ΨJT | 21 | °C/W | 1s board (JESD51-3) | 5 | ||
| Junction to Top Characterization Parameter (HTSOP-J8) | ΨJT | 13 | °C/W | 2s2p board (JESD51-5, 7) | 5 |
CAD (KiCad official)
- Symbol:
BD9G341AEFJ-E2 - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files:
bd9g341aefj-e2-etched.step/bd9g341aefj-e2-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);bd9g341aefj-e2.step/bd9g341aefj-e2.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: ROHM Semicon datasheet (30 pp, sha256
570dbe3348024575, retrieved 2026-10-18, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-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).