component
HT7540-1Q
Public Made by Adomby adom
QNH Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-89. 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
markdownHT7540-1Q
QNH · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89
HT7540-1Q from QNH, in a SOT-89. 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 | GND | power_in | Ground. |
| 2 | VIN | power_in | Input supply; withstands up to 24V (absolute max -0.3 to +24V), and an input capacitor should be placed close to this pin. |
| 3 | VOUT | power_out | Regulated 4.0V output (HT7540), 100mA typical output current; requires an output capacitor larger than 2.2µF to ground. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | QNH |
| Package | SOT-89 |
| Category | Power Management (PMIC) |
| Pins | 3 |
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 | 3.92 | 4 | 4.08 | V | VIN=VOUT+2.0V, IOUT=10mA | 8 |
| Output current | IOUT | 70 | 100 | mA | VIN=VOUT+2.0V | 8 | |
| Load regulation | ΔVOUT | 5 | 60 | mV | VIN=VOUT+2.0V, 1mA≤IOUT≤50mA | 8 | |
| Dropout voltage | VDIF | 25 | 55 | mV | IOUT=1mA, ΔVOUT=2% | 8 | |
| Quiescent current | ISS | 1.5 | 3 | μA | No load | 8 | |
| Line regulation | ΔVOUT/(VOUT*ΔVIN) | 0.2 | %/V | VOUT+1.0V≤VIN≤24V, IOUT=1mA | 8 | ||
| Input voltage | VIN | 24 | V | 8 | |||
| Output voltage temperature coefficient | ΔVOUT/(ΔTA*VOUT) | 100 | ppm/℃ | VIN=VOUT+2.0V, IOUT=10mA, -40℃≤TA≤85℃ | 8 | ||
| Input voltage (absolute maximum) | VIN | -0.3 | 24 | V | 4 | ||
| Storage temperature | TSTG | -50 | 125 | ℃ | 4 | ||
| Operating temperature | TA | -40 | 85 | ℃ | 4 | ||
| Thermal resistance | θJA | 200 | ℃/W | SOT89 | 4 | ||
| Power dissipation | PD | 500 | mW | SOT89 | 4 |
CAD (KiCad official)
- Symbol:
HT7540-1Q - Footprint:
Package_TO_SOT_SMD:SOT-89-3 - 3D model: SOT-89 (KiCad packages3D, STEP)
- 3D model files:
ht7540-1q-etched.step/ht7540-1q-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ht7540-1q.step/ht7540-1q.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: QNH datasheet (13 pp, sha256
78e25abc675b4c05, retrieved 2026-10-22, 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-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).