# LM2594DADJR2G

**onsemi** · DC-DC Converters · SOIC-8

LM2594DADJR2G from onsemi, 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 | NC | unconnected | Not connected; the datasheet's pin function table lists pins 1 through 3 as NC. |
| 2 | NC | unconnected | Not connected; the datasheet's pin function table lists pins 1 through 3 as NC. |
| 3 | NC | unconnected | Not connected; the datasheet's pin function table lists pins 1 through 3 as NC. |
| 4 | FB | input | Direct input of the error amplifier; the external resistor network R2 and R1 connects to this pin to program the output voltage. |
| 5 | ON/OFF | input | Logic-level shutdown input with a typical threshold of 1.6 V; a voltage above this value (up to VIN) shuts the regulator off, while a voltage below 1.6 V or an open pin leaves it on. |
| 6 | GND | power_in | Circuit ground pin; the datasheet refers to its PCB layout information for proper routing. |
| 7 | +VIN | power_in | Positive input supply for the step-down regulator; a suitable input bypass capacitor (CIN) must be present to minimize voltage transients and supply the switching currents. |
| 8 | OUTPUT | output | Emitter of the internal switch with a typical saturation voltage Vsat of 1 V; PCB area on this pin should be kept to a minimum to reduce coupling to sensitive circuitry. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SOIC-8 |
| Category | Power Management ICs |
| 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 |
|---|---|---|---|---|---|---|---|
| Supply Voltage (VIN) | VIN | 4.5 |  | 40 | V |  | 3 |
| Operating Temperature Range | TJ | -40 |  | 125 | °C |  | 3 |
| Maximum Supply Voltage | Vin |  |  | 45 | V |  | 3 |
| ON/OFF Pin Input Voltage | ON/OFF | -0.3 |  |  | V | Upper limit printed as +Vin | 3 |
| Output Voltage to Ground (Steady-State) | Vout | -1 |  |  | V | Steady-state | 3 |
| Storage Temperature Range | Tstg | -65 |  | 150 | °C |  | 3 |
| Maximum Junction Temperature | TJ |  |  | 150 | °C |  | 3 |
| Lead Temperature (Soldering) |  |  |  | 260 | °C | Soldering, 10 seconds | 3 |
| Minimum ESD Rating (Human Body Model) |  | 2 |  |  | kV | C = 100 pF, R = 1.5 k | 3 |
| Feedback Voltage (standard type) | VFB | 1.193 |  | 1.267 | V | 8.0 V ≤ Vin ≤ 40 V, 0.1 A ≤ ILoad ≤ 0.5 A, Vout = 5.0 V; TJ = 25°C | 4 |
| Feedback Voltage (boldface, full range) | VFB | 1.18 |  | 1.28 | V | 8.0 V ≤ Vin ≤ 40 V, 0.1 A ≤ ILoad ≤ 0.5 A, Vout = 5.0 V; TJ = -40°C to +125°C | 4 |
| Max Duty Cycle ON | DC |  |  | 95 | % | Note 4 | 4 |
| Oscillator Frequency (standard) | fosc | 135 | 150 | 165 | kHz | Note 2; TJ = 25°C | 4 |
| Oscillator Frequency (boldface, full range) | fosc | 120 |  | 180 | kHz | Note 2; TJ = -40°C to +125°C | 4 |
| Saturation Voltage (standard) | Vsat |  | 1 | 1.2 | V | Iout = 0.5 A, Notes 3 and 4; TJ = 25°C | 4 |
| Saturation Voltage (boldface, full range) | Vsat |  |  | 1.4 | V | Iout = 0.5 A, Notes 3 and 4; TJ = -40°C to +125°C | 4 |
| Current Limit (standard) | ICL | 0.7 | 1 | 1.6 | A | Peak current, Notes 3 and 4; TJ = 25°C | 4 |
| Current Limit (boldface, full range) | ICL | 0.65 |  | 1.8 | A | Peak current, Notes 3 and 4; TJ = -40°C to +125°C | 4 |
| Output Leakage Current | IL |  | 0.5 | 2 | mA | Output = 0 V (Notes 5 and 6) | 4 |
| Output Leakage Current | IL |  | 13 | 30 | mA | Output = -1.0 V (Notes 5 and 6) | 4 |
| Quiescent Current | IQ |  | 5 | 10 | mA | Note 5 | 4 |
| Standby Quiescent Current (standard) | Istby |  | 50 | 200 | µA | ON/OFF Pin = 5.0 V (OFF); Note 6; TJ = 25°C | 4 |
| Standby Quiescent Current (boldface, full range) | Istby |  |  | 250 | µA | ON/OFF Pin = 5.0 V (OFF); Note 6; TJ = -40°C to +125°C | 4 |
| Feedback Bias Current (standard) | Ib |  | 25 | 100 | nA | Vout = 5.0 V; TJ = 25°C | 4 |
| Feedback Bias Current (boldface, full range) | Ib |  |  | 200 | nA | Vout = 5.0 V; TJ = -40°C to +125°C | 4 |
| Logic Input High Threshold (standard) | VIH | 2.4 |  |  | V | Vout = 0 V (Regulator OFF); TJ = 25°C | 4 |
| Logic Input High Threshold (boldface, full range) | VIH | 2.2 |  |  | V | Vout = 0 V (Regulator OFF); TJ = -40°C to +125°C | 4 |
| Logic Input Low Threshold (standard) | VIL |  |  | 0.8 | V | Vout = Nominal Output Voltage (Regulator ON); TJ = 25°C | 4 |
| Logic Input Low Threshold (boldface, full range) | VIL |  |  | 1 | V | Vout = Nominal Output Voltage (Regulator ON); TJ = -40°C to +125°C | 4 |
| ON/OFF Pin Input Current (high) | IIH |  | 15 | 30 | µA | ON/OFF Pin = 5.0 V (Regulator OFF) | 4 |
| ON/OFF Pin Input Current (low) | IIL |  | 0.01 | 5 | µA | ON/OFF Pin = 0 V (regulator ON) | 4 |
| Thermal Resistance, Junction-to-Ambient (surface mount, SOIC-8) | RθJA |  | 175 |  | °C/W | Surface mount package | 3 |

## 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 | copper |  | The LM2574 is available in both 8−pin DIP and SOIC−8 packages. When used in the typical application the copper | 16 |

## CAD (KiCad official)

- Symbol: `LM2594DADJR2G`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `lm2594dadjr2g-etched.step` / `lm2594dadjr2g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm2594dadjr2g.step` / `lm2594dadjr2g.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [onsemi datasheet](https://www.onsemi.com/pdf/datasheet/lm2594dadjr2-d.pdf) (25 pp, sha256 `5c74e92d6e2c52f2`, 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/lm2594dadjr2g-datasheet.pdf)