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SMA Coaxial Connectors

Sep 02, 2026

Overview

The SubMiniature version A (SMA) connector is a highly versatile, semi-precision coaxial RF connector widely used in microwave and high-frequency systems. Featuring a compact threaded coupling mechanism (1/4-36 UNS), the SMA connector is designed to deliver excellent electrical performance from DC up to 18 GHz, with precision models extending to 26.5 GHz. Its small size and superior reliability make it a preferred choice for modern telecommunications and PCB applications.

Key Features & Benefits

High-Frequency Performance: Engineered for microwave applications, SMA connectors maintain low VSWR and minimal signal loss across a broad frequency spectrum (DC to 18/26.5 GHz).
Compact & Lightweight: The semi-precision design offers a significant reduction in size and weight compared to N-Type connectors, making it ideal for space-constrained devices and densely populated PCBs.
Durable Threaded Interface: The screw-on coupling mechanism ensures a stable, vibration-resistant connection, preventing accidental disconnection in critical systems.
Extensive Compatibility: Available in a vast array of configurations including Standard, Reverse Polarity (RP-SMA), Bulkhead, End Launch, and various termination styles (Solder, Crimp, Clamp) for flexible integration.

Typical Applications

Wireless Communication Systems (WiFi, Bluetooth, Zigbee, LoRa)
PCB Board-to-Board and Board-to-Cable Interconnects
Mobile Devices and Antennas
Microwave Radio Systems & Radar
Test Instruments and Medical Devices

Technical Specifications

Parameter	Specification
Impedance	50Ω (Standard)
Frequency Range	DC ~ 18 GHz (Precision up to 26.5 GHz)
Dielectric Withstanding Voltage	1000 V RMS (Min. at Sea Level)
VSWR	≤ 1.30 (Typical up to 18 GHz)
Insulation Resistance	≥ 5000 MΩ
Durability (Mating Cycles)	≥ 500 Cycles
Temperature Range	-65°C to +165°C
Body Material	Brass / Stainless Steel (Gold or Nickel Plated)
Dielectric	PTFE (Teflon)

Comparison with Other RF Connectors

To help you select the optimal interconnect solution, here is how the SMA compares to other common RF interfaces like N-Type and BNC:

Feature	SMA Connector	N-Type Connector	BNC Connector
Connection Mechanism	Threaded (Compact)	Threaded (Robust)	Bayonet (Quick connect)
Frequency Range	DC to 18 GHz (26.5 GHz Precision)	DC to 11 GHz (18 GHz Precision)	DC to 4 GHz
Size & Form Factor	Small, lightweight, ideal for PCBs	Medium-sized, heavy-duty	Medium-sized, bulky
Power Handling	Medium Power	High Power	Low to Medium Power
Typical Applications	WiFi Modules, GPS, Consumer Electronics	Outdoor Base Stations, Radar	Video, Low-Freq Test Equipment

Selection Guide:

Choose SMA for high-frequency, compact indoor applications, PCB modules, and consumer electronics where size and frequency are critical.
Choose N-Type for outdoor, high-power, and harsh environment applications requiring superior waterproofing and mechanical stability.
Choose BNC for quick-connect requirements in lower frequency (under 4 GHz) test and measurement scenarios.