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What is the difference between SMA and 2.4mm connectors?
Renhotec SMA and 2.4mm are standard RF coaxial connectors widely used in the communications industry. To facilitate customer selection, we have made the following distinctions between the connectors to help you understand these two products more clearly.
1. Material:
| SMA Connector | 2.4mm Connector | |
| Shell | Commonly used brass or low-cost stainless steel, nickel or gold plated for enhanced corrosion resistance. | Stainless steel or beryllium copper (BeCu) plated with gold to improve high-frequency signal transmission stability. |
| Insulator | PTFE material provides stable dielectric properties, but high-frequency loss is higher. | Air dielectric design (some models) or low-loss PTFE to reduce signal attenuation. |
| Conductor | Beryllium copper plated with gold ensures conductivity but has low hardness and short plug-in life. | High-elastic beryllium copper plated with gold, tighter tolerance control (±0.002mm), suitable for high frequencies. |
2. Appearance
Renhotec SMA Connector:
The thread is thicker, the inner diameter of the outer conductor is about 4.1mm, and the connector length is shorter.
Common male connectors (external thread + needle-shaped center conductor) and female connectors (internal thread + hole-shaped conductor).
Renhotec 2.4mm Connector:
The name comes from the inner diameter of the outer conductor of 2.4mm; the thread is finer, and the overall size is smaller.
The precision structure is suitable for high-frequency signals, and some models use a slotless design to reduce reflections.
3. Electrical performance
| Parameters | SMA Connector | 2.4mm Connector |
| Operating frequency | DC-18GHz (conventional) | DC-50GHz |
| Characteristic impedance | 50Ω | 50Ω |
| Insertion loss | Relatively high, especially in the high frequency band Very low | Suitable for high-frequency applications |
| Standing wave ratio | ≤ 1.3 | ≤1.1 |
| Durability | 500 | 500-1000 |
| Mechanical strength Low, | Easy to be damaged during plugging and unplugging High | With the self-alignment function, protect the jack |
4. Application Scenarios
Typical uses of Renhotec SMA Connector:
Wireless communication modules (such as Wi-Fi, Bluetooth), RF power amplifiers, and low-frequency oscilloscope probes.
Advantages: Low cost, easy installation, and suitable for non-extreme high-frequency environments.
Typical uses of Renhotec 2.4mm Connector:
High-frequency test equipment (such as Keysight network analyzers), satellite communication feeders, and terahertz research.
Necessity: When transmitting millimeter-wave signals, the size and frequency must be strictly matched (such as the λ/4 wavelength effect).
Selection Recommendations
Choose SMA: limited budget, frequency ≤18 GHz, frequent plugging and unplugging or outdoor environment (strong weather resistance).
Choose 2.4mm: high-frequency testing (≥26.5 GHz), millimeter wave system, precision laboratory scenario.
The above are the differences between SMA and 2.4mm connectors, and hopefully, this article from Renhotec will help you choose the best product for you.