The Mini-Circuits BLK-89-S+ is a coaxial DC block adapter that prevents direct current from passing through RF circuits while maintaining signal integrity across broad frequency ranges. Designed with SMA connectors and 50 Ohm impedance, this component isolates DC voltage between connected systems without compromising RF performance. The device operates from 0.1 MHz to 8 GHz with insertion loss ranging from 0.01 dB at low frequencies to 0.51 dB at 8 GHz, and return loss performance from 17.29 dB to 48.76 dB across its operational bandwidth. Rated for breakdown voltage of 50 V and operating temperatures from −55 °C to 100 °C, the BLK-89-S+ meets RoHS3 and REACH compliance requirements.
Technical Specifications
• Impedance: 50 Ohms
• Frequency Range: 0.1 MHz to 8 GHz
• Insertion Loss: 0.01 dB (0.3–1.0 MHz) to 0.51 dB (8 GHz)
• Return Loss: 17.29 dB to 48.76 dB (frequency and connector-dependent)
• Breakdown Voltage: 50 V
• Operating Temperature: −55 °C to 100 °C
• Storage Temperature: −55 °C to 100 °C
• Connector Type: SMA
• RoHS Compliance: ROHS3 Compliant
• REACH Compliance: Yes
– Key Features
• Inner DC block architecture for efficient voltage isolation
• Minimal insertion loss across the 0.1 MHz to 8 GHz operating range
• Consistent return loss performance above 17 dB across frequency spectrum
• Dual SMA connector options (male and female) with frequency-dependent return loss characteristics
• Wide temperature operating range (−55 °C to 100 °C) for harsh environments
• Environmental compliance with RoHS3 and REACH standards
– Typical Applications
• Test and measurement instrumentation
• Communication systems
• Defense systems
– Compatibility & Integration
The BLK-89-S+ integrates directly into 50 Ohm RF systems via standard SMA connectors. Its compact form factor and low insertion loss profile support seamless integration into signal chains requiring DC voltage blocking without RF degradation.
