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SIT2596S-12
Public Made by Adomby adom
SIT 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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Contents
README
markdownSIT2596S-12
SIT · DC-DC Converters · TO-263-5
SIT2596S-12 from SIT, 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 | VIN | power_in | DC voltage input, maximum 40V and minimum 4.5V. |
| 2 | Output | output | Switching tube emitter open output connected to the inductor and free-wheeling diode to form a step-down circuit, with output from 1.2V up to 37V. |
| 3 | Ground | power_in | Ground connection. |
| 4 | Feed Back | input | Stabilized sample voltage input, normally connected to the output voltage and compared with the internal 1.23V reference to regulate the duty ratio. |
| 5 | ON/OFF | input | Enable control: above 1.3V (maximum 25V) the switch turns off, output is 0V and input current is 100μA; below 1.3V output is rated; can be tied to GND or left open if shutdown is not needed. |
| 6 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | SIT |
| Package | TO-263-5 |
| 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 |
|---|---|---|---|---|---|---|---|
| Output voltage | VOUT | 11.64 | 12 | 12.36 | V | SIT2596-12; 15V ≤ VIN ≤ 40V, 0.2A ≤ ILOAD ≤ 3A | 7 |
| Efficiency | η | 90 | % | SIT2596-12; VIN = 25V, ILOAD = 3A | 7 | ||
| Oscillator frequency | fO | 127 | 150 | 173 | kHz | 7 | |
| Saturation voltage | VSAT | 1.26 | 1.4 | V | IOUT = 3A (Note 1,2) | 7 | |
| Max duty cycle (ON) | DC | 100 | % | (Note 2) | 7 | ||
| Min duty cycle (OFF) | DC | 0 | % | (Note 3) | 7 | ||
| Current limit | ICL | 3.4 | 4.5 | 6 | A | Peak current (Note 1,2) | 7 |
| Output leakage current | IL | 25 | μA | Output =0V (Note 1, 3) | 7 | ||
| Output leakage current | IL | 1 | 10 | mA | Output = -1V, VIN = 40V | 7 | |
| Quiescent current | IQ | 5 | 10 | mA | (Note 3) | 7 | |
| Standby quiescent current | ISTBY | 100 | 200 | μA | ON/OFF pin = 5V (OFF), VIN = 40V | 7 | |
| ON/OFF pin logic threshold voltage | 1.3 | V | 7 | ||||
| ON/OFF threshold, regulator ON | VIH | 0.6 | V | Low (regulator ON) | 7 | ||
| ON/OFF threshold, regulator OFF | VIL | 2 | V | High (regulator OFF) | 7 | ||
| ON/OFF pin input current | IH | 5 | 15 | μA | VLOGIC = 2.5V (regulator OFF) | 7 | |
| ON/OFF pin input current | IL | 5 | μA | VLOGIC = 0.5V (regulator ON) | 7 | ||
| Thermal resistance junction to ambient, TO-263 | RθJA | 50 | ℃/W | Note 5 | 6 | ||
| Thermal resistance junction to ambient, TO-263 | RθJA | 30 | ℃/W | Note 6 | 6 | ||
| Thermal resistance junction to ambient, TO-263 | RθJA | 20 | ℃/W | Note 7 | 6 | ||
| Thermal resistance junction to package surface (top), TO-263 | RθJC(top) | 2 | ℃/W | 6 | |||
| Operating temperature | -40 | 125 | ℃ | SIT2596S-12 TO263-5 | 29 |
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 | close to the IC, at the same time, the capacitor pin should be short, the connected copper wire should be | 9 |
CAD (KiCad official)
- Symbol:
SIT2596S-12 - Footprint:
Package_TO_SOT_SMD:TO-263-5_TabPin6 - 3D model: TO-263-5 (KiCad packages3D, STEP)
- 3D model files:
sit2596s-12-etched.step/sit2596s-12-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sit2596s-12.step/sit2596s-12.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: SIT datasheet (30 pp, sha256
19aef5d637633418, retrieved 2026-10-22, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-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).