component
LM2574N-3.3
Public Made by Adomby adom
Texas Instruments DC-DC Converters, PDIP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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LM2574N-3.3
Texas Instruments · DC-DC Converters · PDIP-8
LM2574N-3.3 from Texas Instruments, in a PDIP-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 | FB | input | Feedback sense input: connect to the midpoint of the feedback divider to set VOUT for the ADJ version, or connect directly to the output capacitor for fixed-output versions. |
| 2 | SIG_GND | power_in | Signal ground pin that serves as the ground reference for internal references and logic and should be connected to system ground. |
| 3 | ON/OFF | input | Enable input to the regulator where high = OFF and low = ON; connect to GND to enable the regulator and do not leave this pin floating. |
| 4 | PWR_GND | power_in | Power ground pin that connects to system ground and to the ground pins of CIN and COUT, with the path to CIN kept as short as possible. |
| 5 | VIN | power_in | Supply input pin connected to the collector of the high-side transistor; connect to the power supply and input bypass capacitor CIN, keeping the path from VIN to CIN and PWR_GND as short as possible. |
| 6 | NC | unconnected | No internal connection, but this pin must be soldered to the PCB for best heat transfer. |
| 7 | OUTPUT | output | Emitter pin of the power transistor and the switching node; connect to an inductor and the cathode of the external diode. |
| 8 | NC | unconnected | No internal connection, but this pin must be soldered to the PCB for best heat transfer. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | PDIP-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |
CAD (KiCad official)
- Symbol:
LM2574N-3.3 - Footprint:
Package_DIP:DIP-8_W7.62mm - 3D model: PDIP-8 (KiCad packages3D, STEP)
- 3D model files:
lm2574n-3-3-etched.step/lm2574n-3-3-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm2574n-3-3.step/lm2574n-3-3.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (42 pp, sha256
61a9f44cec6689e8, retrieved 2026-10-12, tier: lcsc) - Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- 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).
# LM2574N-3.3
**Texas Instruments** · DC-DC Converters · PDIP-8
LM2574N-3.3 from Texas Instruments, in a PDIP-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 | FB | input | Feedback sense input: connect to the midpoint of the feedback divider to set VOUT for the ADJ version, or connect directly to the output capacitor for fixed-output versions. |
| 2 | SIG_GND | power_in | Signal ground pin that serves as the ground reference for internal references and logic and should be connected to system ground. |
| 3 | ON/OFF | input | Enable input to the regulator where high = OFF and low = ON; connect to GND to enable the regulator and do not leave this pin floating. |
| 4 | PWR_GND | power_in | Power ground pin that connects to system ground and to the ground pins of CIN and COUT, with the path to CIN kept as short as possible. |
| 5 | VIN | power_in | Supply input pin connected to the collector of the high-side transistor; connect to the power supply and input bypass capacitor CIN, keeping the path from VIN to CIN and PWR_GND as short as possible. |
| 6 | NC | unconnected | No internal connection, but this pin must be soldered to the PCB for best heat transfer. |
| 7 | OUTPUT | output | Emitter pin of the power transistor and the switching node; connect to an inductor and the cathode of the external diode. |
| 8 | NC | unconnected | No internal connection, but this pin must be soldered to the PCB for best heat transfer. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | PDIP-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |
## CAD (KiCad official)
- Symbol: `LM2574N-3.3`
- Footprint: `Package_DIP:DIP-8_W7.62mm`
- 3D model: PDIP-8 (KiCad packages3D, STEP)
- 3D model files: `lm2574n-3-3-etched.step` / `lm2574n-3-3-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm2574n-3-3.step` / `lm2574n-3-3.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/lm2574) (42 pp, sha256 `61a9f44cec6689e8`, retrieved 2026-10-12, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **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/lm2574n-3-3-datasheet.pdf)