# TD1501SADJ

**Techcode Semicon** · DC-DC Converters · TO-263-5

TD1501SADJ from Techcode Semicon, 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 | Positive input supply for the switching regulator; a suitable input bypass capacitor must be present at this pin to minimize voltage transients and supply the regulator's switching currents, with input voltage specified at 3.6 V to 45 V. |
| 2 | Output | output | Internal switch output that swings between (+VIN - VSAT) and approximately -0.5 V at a duty cycle of about VOUT/VIN, so its PCB copper area should be kept to a minimum to limit coupling to sensitive circuitry. |
| 3 | GND | power_in | Circuit ground, which should be connected to a ground plane together with the input and output capacitors. |
| 4 | FB | input | Senses the regulated output voltage to close the feedback loop; on the ADJ version it is fed from a resistive divider so that VOUT = 1.235 × (R1 + R2) / R1. |
| 5 | ON/OFF | input | Logic-level shutdown input in which pulling the pin below about 1.3 V turns the regulator on and pulling it above 1.3 V (up to a maximum of 25 V) shuts it down; leaving it open or tying it to ground keeps the regulator on. |
| 6 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Techcode Semicon |
| 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 |
|---|---|---|---|---|---|---|---|
| Input Voltage | VIN | -0.3 |  | 45 | V |  | 4 |
| Feedback Pin Voltage | VFB | -0.3 |  |  | V | Max printed as Vin+0.3 V | 4 |
| ON/OFF Pin Voltage | VEN | -0.3 |  |  | V | Max printed as Vin+0.3 V | 4 |
| Output Pin Voltage | VSW | -0.3 |  |  | V | Max printed as Vin+0.3 V | 4 |
| Operating Junction Temperature | TJ |  |  | 150 | ºC |  | 4 |
| Storage Temperature | TSTG | -65 |  | 150 | ºC |  | 4 |
| Lead Temperature (Soldering, 10 sec) | TLEAD |  |  | 260 | ºC | Soldering, 10 sec | 4 |
| ESD (HBM) |  |  |  | 2000 | V | HBM | 4 |
| Input Voltage | VIN | 3.6 |  | 45 | V |  | 4 |
| Operating Junction Temperature | TJ | -40 |  | 125 | ºC |  | 4 |
| Operating Ambient Temperature | TA | -40 |  | 85 | ºC |  | 4 |
| Output Voltage (ADJ), pair value 1 | VOUT | 1.193 | 1.23 | 1.267 | V | 11V≤VIN ≤ 45V, 0.2A ≤ ILOAD≤3A, VOUT for 9V | 6 |
| Output Voltage (ADJ), pair value 2 | VOUT | 1.18 | 1.23 | 1.28 | V | 11V≤VIN ≤ 45V, 0.2A ≤ ILOAD≤3A, VOUT for 9V | 6 |
| Feedback bias current, value 1 | Ib |  | 10 | 50 | nA | Adjustable only, VFB=1.3V | 5 |
| Feedback bias current, value 2 | Ib |  | 10 | 100 | nA | Adjustable only, VFB=1.3V | 5 |
| Quiescent current | IQ |  | 5 | 10 | mA | VFB=12V force driver off | 5 |
| Standby quiescent current, value 1 | ISTBY |  | 80 | 200 | uA | ON/OFF=5V, VIN=36V | 5 |
| Standby quiescent current, value 2 | ISTBY |  | 80 | 250 | uA | ON/OFF=5V, VIN=36V | 5 |
| Oscillator frequency | FOSC | 127 | 150 | 173 | KHz |  | 5 |
| Saturation voltage, value 1 | VSAT |  | 1.2 | 1.4 | V | IOUT=3A | 5 |
| Saturation voltage, value 2 | VSAT |  | 1.2 | 1.5 | V | IOUT=3A | 5 |
| Current Limit, value 1 | ICL |  | 4.5 | 5.5 | A | Peak Current (VFB=0V) | 5 |
| Current Limit, value 2 | ICL |  | 4.5 | 6.5 | A | Peak Current (VFB=0V) | 5 |
| Output leakage current | IL |  |  | 50 | uA | Output=0V (VFB=12V) | 5 |
| Output leakage current | IL |  | 2 | 30 | mA | Output=-1V (VIN=36V) | 5 |
| ON/OFF pin logic input threshold voltage, low | VIL |  |  | 0.6 | V | Low (Regulator ON) | 5 |
| ON/OFF pin logic input threshold voltage, high | VIH | 2 |  |  | V | High (Regulator OFF) | 5 |
| ON/OFF pin input current, high | IH |  | 5 | 15 | uA | VLOGIC=2.5V (Regulator OFF) | 5 |
| ON/OFF pin input current, low | IL |  | 0.02 | 5 | uA | VLOGIC=0.5V (Regulator ON) | 5 |
| Thermal Resistance Junction to Case | θJC |  | 3.5 |  | OC/W | TO263-5L | 5 |
| Thermal Resistance Junction to Ambient | θJA |  | 23 |  | OC/W | TO263-5L; Note1: copper area approximately 3 in2 | 5 |
| Thermal Resistance-Junction to Ambient | RθJA |  | 23 |  | ºC / W |  | 4 |
| Thermal Resistance-Junction to Case | RθJC |  | 3.5 |  | ºC / W |  | 4 |
| Efficiency | η |  | 88 |  | % | VIN=12V, VOUT=9V, ILOAD=3A | 6 |

## 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 |  | this is the output (switch) pin, which should not have large areas of copper.) Large areas of copper provide the | 12 |

## CAD (KiCad official)

- Symbol: `TD1501SADJ`
- Footprint: `Package_TO_SOT_SMD:TO-263-5_TabPin6`
- 3D model: TO-263-5 (KiCad packages3D, STEP)
- 3D model files: `td1501sadj-etched.step` / `td1501sadj-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `td1501sadj.step` / `td1501sadj.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Techcode Semicon datasheet](docs/td1501sadj-datasheet.pdf) (18 pp, sha256 `c0e40074baddb703`, retrieved 2026-11-05, tier: lcsc)
- **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/td1501sadj-datasheet.pdf)