component
CJ7908
Public Made by Adomby adom
Changjing Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, TO-252-2(DPAK). 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
markdownCJ7908
Changjing · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-252-2(DPAK)
CJ7908 from Changjing, in a TO-252-2(DPAK). 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 reference for the CJ7908 negative regulator, with typical quiescent current of 1.5 mA (2 mA max) at TJ=25°C. |
| 2 | IN | power_in | Negative unregulated input voltage Vi (-35 V appears as the input rating, -14 V test condition), decoupled with a 2.2 µF input capacitor Ci. |
| 3 | OUT | power_out | Regulated -8 V output (-7.76 V to -8.24 V at TJ=25°C, 1.5 A maximum output current), with a 1 µF output capacitor Co. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | TO-252-2(DPAK) |
| 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 | Vo | -7.6 | -8 | -8.4 | V | TJ=25℃; -10.5V≤Vi≤-23V, Io=5mA-1A | 1 |
| Output Voltage | Vo | -7.76 | -8 | -8.24 | V | Ta= 25 ℃ | 1 |
| Load Regulation | ∆Vo | 15 | 160 | mV | TJ=25℃; Io=5mA-1.5A | 1 | |
| Load Regulation | ∆Vo | 5 | 80 | mV | TJ=25℃; Io=250mA-750mA | 1 | |
| Line Regulation | ∆Vo | 12.5 | 160 | mV | TJ=25℃; -10.5V≤Vi≤-25V | 1 | |
| Line Regulation | ∆Vo | 4 | 80 | mV | TJ=25℃; -11V≤Vi≤-17V | 1 | |
| Quiescent Current | Iq | 1.5 | 2 | mA | TJ=25℃ | 1 | |
| Ripple Rejection | RR | 54 | 60 | dB | TJ=25℃; -11.5V≤Vi≤-21.5V, f=120Hz | 1 | |
| Operating Junction Temperature Range | TOPR | -40 | 125 | ℃ | Operating temperature range applies unless otherwise specified | 1 | |
| Storage Temperature Range | TSTG | -65 | 150 | ℃ | 1 | ||
| Continuous Total Dissipation | PD | 1.25 | W | 1 | |||
| Maximum Output Current | IOM | 1.5 | A | 1 | |||
| Quiescent Current Change | ∆Iq | 1 | mA | TJ=25℃; -10.5V≤Vi≤-25V | 1 | ||
| Quiescent Current Change | ∆Iq | 0.5 | mA | TJ=25℃; 5mA≤IO≤1A | 1 | ||
| Output Noise Voltage | VN | 200 | μV | 10Hz≤f≤100KHz | 1 | ||
| Output Voltage Drift | △Vo/△T | -0.6 | mV/℃ | IO=5mA | 1 | ||
| Dropout Voltage | Vd | 1.1 | V | Io=1A | 1 | ||
| Peak Current | Ipk | 2.1 | A | 1 | |||
| Thermal Resistance from Junction to Air | RθJA | 100 | ℃/W | 1 |
CAD (KiCad official)
- Symbol:
CJ7908 - Footprint:
Package_TO_SOT_SMD:TO-252-2 - 3D model: TO-252-2(DPAK) (KiCad packages3D, STEP)
- 3D model files:
cj7908-etched.step/cj7908-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);cj7908.step/cj7908.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Changjing datasheet (3 pp, sha256
f68e9d1c63c3cf7c, retrieved 2026-10-18, tier: lcsc) - 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).