Monoprice
Monoprice 139912 USB A to Micro B Cable (5-Pack)
★★★★★
USB 2.0
Gold-plated connectors, ferrite-core shielding, and 28/24AWG conductors across a 5-pack of 6-foot USB 2.0 cables — interference-free data and charging for every device on your bench.
$10.78*
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*Price sourced from Amazon.com. Last updated:Jul 16, 2026.Price and availability are subject to change.
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Overview
Key Features
100 percent compliant with USB 2.0 specifications.
28 AWG data conductors and 24 AWG power conductors.
Gold plated connectors ensure a smooth, corrosion-free connection.
Molded connector heads with molded strain relief boots.
Shielded to protect against external signal interference. Includes a ferrite core to prevent RF and electromagnetic interference.
Specifications
Product Count
5-Pack
USB Standard
USB 2.0
Connector Type A
USB A
Connector Type B
Micro B
Data Conductor Gauge
28 AWG
Power Conductor Gauge
24 AWG
Connector Plating
Gold plated
Strain Relief
Molded boots
Shielding
Yes
Interference Protection
Ferrite core (RF and electromagnetic)
Pros & Cons
👍 Pros
- 5-pack format eliminates the single-cable shortage problem — equipping an entire bench, rack, or studio with matched cables in one purchase
- 28AWG data / 24AWG power conductor split optimizes both signal integrity and power delivery efficiency within USB 2.0 specification
- Gold-plated connectors on all 10 connector ends resist oxidation across thousands of insertion cycles, maintaining rated contact resistance over cable lifetime
- Ferrite cores at both ends suppress RF and EMI coupling — measurably effective in electrically noisy environments where data corruption occurs on unshielded cables
- Molded strain relief boots distribute bend stress at the connector junction, addressing the primary mechanical failure point of cheaper USB cables
👎 Cons
- USB 2.0 maximum throughput of 480 Mbps is a hard ceiling — these cables provide no advantage for devices capable of USB 3.x speeds
- Micro-B is a legacy connector form factor; devices transitioning to USB-C cannot use these cables without an adapter at each connection
- 6-foot length covers typical desk runs but may be insufficient for cross-room or rack-to-equipment cable paths that the 15-foot Monoprice variant would serve better
- The 5-pack is all uniform black with no color-coding or length differentiation, complicating cable identification in dense multi-device setups
- No right-angle connector option — tight cable routing behind equipment with recessed Micro-B ports may cause mechanical stress on the straight connector head
Frequently Asked Questions
What is the maximum data transfer rate these cables support, and does the 28AWG data conductor gauge limit throughput?
These cables are fully USB 2.0 compliant, supporting a maximum theoretical data transfer rate of 480 Mbps. The 28AWG data conductors are the standard specification for USB 2.0 signal lines — they are not a limiting factor within the USB 2.0 protocol. Actual transfer speeds will be determined by the host controller and connected device, not the cable conductors.
Does the ferrite core on the Monoprice 139912 improve performance in electrically noisy environments like studios or server rooms?
Yes — ferrite cores are specifically effective at suppressing high-frequency RF and electromagnetic interference that couples into cable conductors in environments with switching power supplies, LED drivers, and RF-emitting equipment. In electrically clean environments the ferrite core has no measurable effect, but in noisy environments it reduces the bit-error rates and data corruption that can affect long-running transfers over unshielded cables.
Are these cables suitable for fast-charging USB devices, or are they data-only cables?
The 24AWG power conductors on these cables are rated for higher current capacity than the 28AWG conductors used in data-only cables — 24AWG reduces resistive voltage drop on the power lines, which supports more efficient charging. These cables support both data and charging simultaneously. They are USB 2.0 cables and do not support USB fast-charging protocols (Quick Charge, Power Delivery) which require USB 3.x or dedicated charging cables with protocol negotiation.
How does the molded strain relief on the Monoprice 139912 compare to standard overmolded connectors at the connector junction?
The molded connector heads with integrated strain relief boots on the 139912 distribute bend stress across a longer section of cable at the connector junction, reducing the fatigue cycling that causes internal wire break at the termination point — the most common failure mode of cheap cables. Overmolded connectors without strain relief provide no stress distribution, which is why budget cables typically fail at the plug rather than along the cable length.
What is the Micro-B connector lifespan rating for these cables, and how does regular insertion/removal affect longevity?
The USB Micro-B connector is specified by the USB-IF for approximately 10,000 insertion/removal cycles. Gold plating on the Monoprice 139912 connectors resists the oxidation that degrades contact resistance on tin-plated connectors over repeated cycles. In practice, cables that are plugged and unplugged multiple times daily will approach this limit over years of use; cables used in semi-permanent connections (like bench charging setups) will last indefinitely in normal conditions.
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