Item specifics
Description
SCHF-17+ Product Overview
The SCHF-17+ is a 50Ω surface-mount RF high pass filter from Mini-Circuits, a world-leading manufacturer of RF and microwave components. Built with a lumped LC topology using high-Q capacitors and wire-wound inductors, the filter offers superior performance. It features a 3dB cutoff frequency of 16.5MHz, a typical passband from 18MHz to 200MHz, and a bandwidth of 182MHz. Housed in an 8-SMD flat lead package measuring 19.05×9.65×7.11mm, the SCHF-17+ is widely used in HF/VHF broadcasting, radar systems, transceivers, satellite communications, and laboratory test equipment.
SCHF-17+ Core Features
Low Insertion Loss： Typical insertion loss of only 1dB, minimizing signal attenuation and preserving system link budget
Wide Passband： Typical passband from 18MHz to 200MHz, with a 3dB cutoff frequency of 16.5MHz and bandwidth of 182MHz, suitable for HF/VHF RF signal processing
High Rejection： Excellent suppression of signals below cutoff, providing >40dB rejection below 9MHz and >20dB rejection below 13MHz
50Ω Impedance Matching： Standard 50Ω characteristic impedance for seamless integration with mainstream RF systems
Lumped LC Topology： Built with high-Q capacitors and wire-wound inductors for stable, reliable performance
Miniature Surface-Mount Package： 8-SMD flat lead package measuring just 19.05×9.65×7.11mm for high-density PCB layouts
Wide Operating Temperature Range： Operating temperature -40℃ to +85℃; storage temperature -55℃ to +100℃
RoHS Compliant： Meets RoHS 3 environmental standards for green electronics manufacturing
Active Product Status： Part status is “Active” with stable supply
SCHF-17+ Applications
Broadcasting Systems： Front-end filtering in broadcast transmitters and receivers
Radar Applications： Front-end signal conditioning in radar receivers
Satellite Communications： Signal conditioning in satellite ground stations and terminals
Transceiver Systems： RF front-end filtering in transceivers
Laboratory Test Equipment： Signal filtering in laboratory test equipment
HF/VHF Radio Communication Equipment： Front-end filtering in various HF/VHF wireless communication devices
SCHF-17+ Key Advantages
Mini-Circuits Quality Assurance： As a global leader in RF/microwave components with over 50 years of industry experience, Mini-Circuits ensures the highest quality and reliability standards
Low Insertion Loss Optimizes System Performance： The 1dB typical insertion loss helps maintain receiver sensitivity and transmitter output power, especially critical for high-performance RF systems
Wide Passband Covers HF/VHF Applications： The 18-200MHz passband enables one device to serve multiple RF front-end filtering needs
High-Q LC Topology Delivers Superior Performance： High-Q capacitors and wire-wound inductors provide steep cutoff characteristics and high out-of-band rejection (>40dB below 9MHz) while maintaining low insertion loss
Miniature SMD Package for High-Density Designs： The 8-SMD flat lead package (19.05×9.65mm) saves valuable PCB space and supports automated SMT assembly
Wide Temperature Stability： Operating temperature -40℃ to +85℃ and storage temperature -55℃ to +100℃ for demanding industrial and communication environments
RoHS Compliant： Meets RoHS 3 environmental standards for global market compliance
Active Supply Status： Part status is “Active” with stable supply for volume procurement
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FAQ:
What is the Mini‑Circuits SCHF‑17+ SMD RF high‑pass filter?
The SCHF‑17+ is a miniature LTCC (Low Temperature Co‑fired Ceramic) high‑pass filter in an 8‑lead SMD package. It is designed to pass signals above its cut‑off frequency while strongly attenuating lower‑frequency signals. With a nominal 50 Ω impedance and low insertion loss, it is widely used in RF and microwave signal chains to remove unwanted low‑frequency noise, harmonics, and DC offsets.
What is the exact cut‑off frequency of the SCHF‑17+? Is it 16.5 MHz or 17 MHz?
The typical 3 dB cut‑off frequency is 17 MHz. Some older listings may reference 16.5 MHz, but the official Mini‑Circuits data sheet specifies a 17 MHz nominal cut‑off. The passband extends from 17 MHz to 3000 MHz, making it suitable for a very wide range of RF applications.
What is the typical insertion loss of the SCHF‑17+, and how does it affect my signal?
The typical insertion loss in the passband is only 1.0 dB. This means less than 21 % of the signal power is lost as heat. Return loss is typically 14 dB (VSWR 1.5:1), indicating good impedance matching to 50 Ω systems and minimal signal reflection.
What is the stopband rejection of the SCHF‑17+? How much attenuation does it provide?
The filter provides excellent low‑frequency suppression. Typical rejection is 20 dB at 8.5 MHz, and it increases rapidly at lower frequencies. This effectively blocks AM broadcast band signals, switching noise, and other low‑frequency interference from reaching your receiver or ADC.
What is the maximum RF input power the SCHF‑17+ can handle?
The SCHF‑17+ is rated for a maximum RF input power of 10 W (+40 dBm) at 25 °C. This makes it suitable for both receiver front‑ends and moderate‑power transmitter filtering, provided the operating temperature limits are observed.
What is the package size of the SCHF‑17+, and what does “8‑SMD” mean?
The package is an 8‑lead surface‑mount ceramic body measuring only 3.2 mm × 1.6 mm (1206 style). The “8‑SMD” designation means eight terminals (four signal pads and four ground pads) that are soldered directly onto the PCB. The tiny footprint saves board space and is compatible with standard reflow soldering processes.
Does the SCHF‑17+ require any external matching components? Can I drop it into a 50 Ω line?
The filter is internally matched to 50 Ω. No external inductors, capacitors, or matching networks are needed. Simply place it in a 50 Ω microstrip or coplanar waveguide trace, connect the ground pads to a solid ground plane, and it will perform to specification.
What are the most common applications of the SCHF‑17+ high‑pass filter?
It is used in broadband receivers, software‑defined radios (SDRs), spectrum analyser front‑ends, harmonic rejection filters, and any RF system that needs to remove strong low‑frequency signals (such as AM broadcast, switching power‑supply noise, or DC offsets) before a sensitive amplifier or ADC stage.
How does the SCHF‑17+ compare to other Mini‑Circuits high‑pass filters like the SCHF‑25+?
The SCHF‑17+ and SCHF‑25+ share the same LTCC technology, 50 Ω impedance, and identical package size. The difference is the cut‑off frequency: 17 MHz for the SCHF‑17+ and 25 MHz for the SCHF‑25+. Choose the SCHF‑17+ when you need to pass frequencies down to 17 MHz; choose the SCHF‑25+ if you can sacrifice a little low‑end bandwidth for even stronger rejection just below 25 MHz.
Can I use the SCHF‑17+ in a bidirectional RF system?
Yes. The filter is a passive, linear, bilateral device, so it works identically in both directions. It can be placed at the antenna port, between mixer stages, or anywhere in a bidirectional signal path without affecting reciprocity.