component
LM2595S-3.3
Public Made by Adomby adom
HGSEMI DC-DC Converters, TO-263-5. 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
markdownLM2595S-3.3
HGSEMI · DC-DC Converters · TO-263-5
LM2595S-3.3 from HGSEMI, in a TO-263-5. 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 | OUTPUT | output | Power switch output pin, a switching node that supplies the output load. |
| 2 | VIN | power_in | Supply input pin that requires a DC supply in the 4.5V to 40V range, with a large capacitor between VIN and GND to suppress supply noise. |
| 3 | GND | power_in | Ground pin that should be routed so the switching current spikes do not feed noise into the supply, with the Schottky diode return path kept separate from the output node. |
| 4 | FEEDBACK | bidirectional | Voltage feedback pin that senses the output through a resistor divider, with a threshold voltage of 1.23V. |
| 5 | ON_OFF | input | Enable pin in which a high level shuts the chip down and a low level turns it on; it defaults to low when floating. |
| 6 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | HGSEMI |
| Package | TO-263-5 |
| Category | Power Management ICs |
| 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 |
|---|---|---|---|---|---|---|---|
| Output voltage regulation (LM2595-3.3) | VOUT | 3.168 | 3.3 | 3.432 | V | VIN=4.75V～40V ILOAD=0.2A～3A | 4 |
| Input operating voltage | VIN | 4.5 | 40 | V | 5 | ||
| Switch pin threshold voltage (control off, high level) | VON_OFF | 1.4 | V | 5 | |||
| Switch pin threshold voltage (control on, low level) | VON_OFF | 0.8 | V | 5 | |||
| Standby current | ISTBY | 80 | 200 | uA | VON_OFF=5V | 5 | |
| Quiescent operating current | IQ | 2 | 10 | mA | VON_OFF=0V, VFB=VIN | 5 | |
| Operating frequency | FOSC | 127 | 150 | 173 | kHz | 5 | |
| Current limit | IL | 3.6 | 4.8 | 6.9 | A | VFB=0 | 5 |
| Switch pin leakage current (off) | IH | 5 | 30 | µA | VON_OFF=2.5V(OFF) | 5 | |
| Switch pin leakage current (on) | IL | 0.2 | 10 | µA | VON_OFF=0.5V(ON) | 5 | |
| Saturation voltage | VCE | 1.3 | 1.5 | V | VFB=0V LOUT=3A | 5 | |
| Input voltage (absolute maximum) | VIN | 40 | V | 3 | |||
| Feedback pin voltage (absolute maximum) | VFB | -0.3 | V | upper limit printed as VIN | 3 | ||
| Switch pin voltage (absolute maximum) | VON_OFF | -0.3 | V | upper limit printed as VIN | 3 | ||
| Power output pin voltage (absolute maximum) | VOUT PUT | -0.3 | V | upper limit printed as VIN | 3 | ||
| Operating junction temperature (absolute maximum) | TJ | -40 | 125 | ℃ | 3 | ||
| Storage temperature | TSTG | -65 | 150 | ℃ | 3 | ||
| Lead soldering temperature | TLEAD | 245 | ℃ | 10S | 3 | ||
| ESD capability (human body model) | ESD | 2000 | V | 3 | |||
| Input voltage (recommended operating) | VIN | 5 | 40 | V | LM2595 | 4 | |
| Operating junction temperature range (recommended) | TJ | -40 | 125 | ℃ | 4 | ||
| Junction-to-ambient thermal resistance (TO-263) | RθJA | 42.6 | °C/W | 3 | |||
| Junction-to-case thermal resistance, top (TO-263) | RθJC(top) | 43.3 | °C/W | 3 | |||
| Junction-to-board thermal resistance (TO-263) | RθJB | 22.4 | °C/W | 3 | |||
| Junction-to-case thermal resistance, bottom (TO-263) | RθJC(bot) | 0.4 | °C/W | 3 | |||
| Junction-to-top characterization parameter (TO-263) | ΨJT | 10.7 | °C/W | 3 | |||
| Junction-to-board characterization parameter (TO-263) | ΨJB | 21.3 | °C/W | 3 | |||
| Junction-to-ambient thermal resistance, no heatsink (TO220, TO263) | RJA | 50 | ℃/W | no heatsink | 5 |
CAD (KiCad official)
- Symbol:
LM2595S-3.3 - Footprint:
Package_TO_SOT_SMD:TO-263-5_TabPin6 - 3D model: TO-263-5 (KiCad packages3D, STEP)
- 3D model files:
lm2595s-3-3-etched.step/lm2595s-3-3-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm2595s-3-3.step/lm2595s-3-3.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: HGSEMI datasheet (12 pp, sha256
1fa61335886c0e2f, retrieved 2026-10-28, 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).