Lenovo 65W 20V 3.25A small-pin (4.0 × 1.7 mm) AC adapter / charger is a common laptop power supply used with many IdeaPad, Yoga, Flex, V-series, and some Chromebook models. It is often called the “small pin,” “round tip,” or “4.0×1.7 mm” adapter (outer diameter 4.0 mm, inner diameter 1.7 mm).
Always match the voltage (20 V), current/amperage (at least 3.25 A or the laptop's requirement), wattage, and exact tip size. Using an incorrect adapter can damage the laptop or cause unsafe operation. Check the label on your original charger or the laptop's bottom for the required INPUT rating. This is distinct from USB-C GaN adapters, rectangular “slim tip,” or larger round tips used on other Lenovo models.
OEM units (e.g., genuine Lenovo) generally offer the best reliability and exact fit; high-quality compatible replacements are also common.
Typical Compatibility (examples — always verify your laptop's exact input rating and tip size)
| Parameter | Value |
|---|---|
| Output | 20 V DC ⎓ 3.25 A (65 W max) |
| Input | 100–240 V AC, 50/60 Hz (worldwide) |
| Connector | Round tip 4.0 mm (OD) × 1.7 mm (ID) |
| Power rating | 65 W (often backward-compatible with lower-wattage 45 W / 2.25 A models that use the same tip) |
| Typical part numbers (OEM examples) | ADLX65CLGU2A, ADLX65CLGC2A, ADLX65NCC3A, ADLX65NDC3A, ADLX65NLC3A, ADLX65CCGU2A, and similar |
| Protections | Over-voltage (OVP), over-current (OCP), over-temperature (OTP), short-circuit (SCP), and often over-power / anti-surge |
| Certifications | Commonly CE, FCC, UL, RoHS, CB, and efficiency Level VI (varies by OEM vs. compatible) |
| Form factor | Compact brick (dimensions vary; examples ~74 × 74 × 28 mm or similar); black plastic |
| Cable | DC cable usually attached; AC power cord may be detachable (IEC C5 “cloverleaf” or similar) or integrated depending on the specific unit |
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