Lenovo Big Pin Adapter refers to the larger round barrel (cylindrical) power connectors used on many older Lenovo ThinkPad and IdeaPad laptops (roughly mid-2000s to early 2010s). The most common “big pin” size is 7.9 mm outer diameter × 5.5 mm inner diameter with a center pin.
These are distinct from:
Description
A reliable AC-to-DC power adapter (charger) that converts wall power into the stable 20 V DC required by compatible Lenovo laptops. It is widely sold as both genuine Lenovo/OEM and high-quality compatible replacements. Ideal as a spare or replacement for lost/damaged original chargers. Commonly used for home, office, and travel.
| Parameter | Common Values |
|---|---|
| Output Voltage | 20 V DC |
| Output Current | 3.25 A (65 W), 4.5 A (90 W), 6.75 A (135 W), up to ~8.5 A (170 W) |
| Power Rating | 65 W, 90 W, 135 W (most common); higher for workstations |
| Connector Size | 7.9 mm × 5.5 mm (outer × inner) with center pin |
| Input | 100–240 V AC, 50/60 Hz |
| Efficiency | Typically high (≈89–90%+) |
| Cable Length | Usually 1.5–1.8 m DC cable |
| Protections | OVP, OCP, SCP, over-temperature |
| Certifications | Often CE, FCC, RoHS, BIS (varies by seller) |
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These shipping terms and conditions are subject to change without notice. Please review this page regularly for updates.
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