Adafruit
30 Piece 5.5 / 2.1mm to DC Barrel Jack Adapter Kit
A comprehensive set of 30 barrel jack plug adapters that convert a standard 5.5mm / 2.1mm DC jack to a wide variety of other tip sizes. Perfect for powering ...
A comprehensive set of 30 barrel jack plug adapters that convert a standard 5.5mm / 2.1mm DC jack to a wide variety of other tip sizes. Perfect for powering devices that use non-standard barrel connectors from your existing DC power supplies, USB-C to DC cables, or battery packs.
Each adapter plugs smoothly into a 5.5mm / 2.1mm jack and provides a different sized tip. No voltage translation is performed — ensure your device expects the voltage and current capability of your power supply. Polarity is preserved (centre-positive in, centre-positive out).
Key Features
- 30 Different Adapters – Wide range of tip sizes for maximum compatibility
- Standard 5.5/2.1mm Input – Works with common DC wall adapters and battery holders
- Polarity Preserved – Centre-positive input remains centre-positive at the tip
- Includes Laptop Tips – Adapters for Lenovo (round and rectangular) and Dell laptop connectors
Included Adapter Sizes
- 2.0 × 0.5mm
- 3.5 × 1.1mm
- 2.35mm
- 2.5mm
- 2.5mm (phono jack)
- 3.5mm (phono jack)
- 3.0 × 1.1mm
- 4.8mm
- 3.5 × 1.2mm
- 4.0 × 1.7mm (inner spring tip)
- 4.8 × 1.7mm (inner spring tip)
- 5.0mm
- 5.5 × 2.5mm
- 5.5 × 2.1mm (inner spring tip)
- 7.9mm (Lenovo round type)
- 7.4mm
- Dell three-contact type
- 5.5 × 1.9mm
- 6.0mm (with centre contact pin)
- 6.3mm
- 5.5 × 2.5mm
- 5.5 × 2.5mm (inner spring tip)
- 5.5 × 2.1mm
- 5.5 × 2.1mm (inner spring tip)
- 5.5 × 1.5mm
- 5.5 × 1.7mm (inner spring tip)
- 5.0 × 2.1mm
- 5.0 × 2.5mm
- 4.5mm
- Lenovo large rectangular type
Ideal For
- Powering devices with non-standard DC barrel connectors
- Electronics workshops and repair benches
- Matching power supplies to legacy or uncommon equipment
Package Contents
- 30× DC barrel jack plug adapters (various sizes)
Jargon buster
Plain-language definitions for the technical terms used above.
- DC barrel jack
- A round power connector commonly used for low-voltage DC power supplies, often described by its outer and inner diameters such as 5.5 x 2.1 mm. Matching the barrel size and polarity is important so the plug physically fits and powers the device correctly.
- USB-C
- A modern reversible USB connector used for power and data connections. On this product it matters because it can connect directly to a computer as well as to a microcontroller project.
Find this product in
Power & Batteries
Related Tutorials
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