SCLF-225+ Mini-Circuits SMD RF Low Pass Filter DC-225MHz 1dB Insertion Loss 50Ω SMD-8

SCLF-225+ Product Overview

The SCLF-225+ is a 50Ω surface‑mount RF low 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 covers a passband from DC to 225MHz with a 3dB cutoff frequency of 250MHz, and a typical insertion loss of just 1dB. Housed in an 8‑SMD flat lead package measuring 19.05×9.65×7.11mm, the SCLF-225+ is widely used in broadcasting, radar systems, transceivers, satellite communications, and broadband fiber optic networks.

SCLF-225+ Core Features

Low Insertion Loss： Typical insertion loss of only 1dB， minimizing signal attenuation and preserving system link budget

Wide Passband： Covers DC to 225MHz with a 3dB cutoff frequency of 250MHz， suitable for baseband and low‑frequency RF signal processing

High Rejection： Excellent suppression of signals above the cutoff frequency, effectively filtering out out‑of‑band spurs and interference

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

Surface‑Mount Design： Supports automated SMT assembly for high‑volume manufacturing

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

SCLF-225+ 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

Broadband Fiber Networks： RF signal processing in fiber‑optic communication systems

Test Equipment： Signal filtering in laboratory test equipment

Video Equipment： Filtering applications in video signal processing

Radio Communication Equipment： Front‑end filtering in various wireless communication devices

SCLF-225+ 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 Baseband and Low‑Frequency Applications： The DC‑225MHz 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 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

Why Choose QIXINWEI

Years of experience in the electronics industry. Trusted by global customers.

Massive In-Stock Inventory – Ready to ship promptly

BOM Matching Service – One-stop solution, save time

PCBA Customization – Professional engineering team creates tailor-made solutions based on your needs

Cost-Effective & Efficient – Better channel, better cost

A dedicated team makes your procurement smoother.

Contact us for BOM quotes or PCBA inquiries

FAQ:

1. What is the Mini‑Circuits SCLF‑225+ and what is its exact cut‑off frequency?
   The SCLF‑225+ is a miniature LTCC low‑pass filter in an 8‑lead SMD package. Its typical 3 dB cut‑off frequency is 225 MHz. The passband extends from DC to 225 MHz with very low insertion loss, making it ideal for VHF/UHF applications that require clean low‑frequency signal transmission and strong suppression of higher‑frequency harmonics and spurious signals.

2. What is the typical insertion loss of the SCLF‑225+, and how does it affect my signal?
   The typical insertion loss in the passband is only 1.0 dB. This means the filter absorbs roughly 20 % of the signal power, leaving 80 % delivered to the load. Combined with a typical return loss of 14 dB (VSWR 1.5:1), it ensures a good 50 Ω match and minimal signal reflection.

3. How much stopband attenuation does the SCLF‑225+ provide, and at what frequencies?
   Rejection increases rapidly above the 225 MHz cut‑off. Typical attenuation reaches 20 dB at 330 MHz and 40 dB at 550 MHz. This effectively suppresses second and third harmonics, as well as other out‑of‑band interference, protecting sensitive receiver or ADC stages from strong high‑frequency signals.

4. What is the maximum RF input power the SCLF‑225+ can handle?
   The filter is rated for a maximum RF input power of 10 W (+40 dBm) at 25 °C. It can be used in moderate‑power transmitter paths or receiver front‑ends, provided the temperature limits are respected and power is derated at higher ambient temperatures.

5. What is the package size and what does “8‑SMD” mean?
   The SCLF‑225+ comes in a compact 3.2 mm × 1.6 mm (1206 style) ceramic body with 8 surface‑mount terminals. Four of these are signal pads and four are ground pads. This tiny footprint saves board space and is compatible with standard reflow soldering processes.

6. Does the SCLF‑225+ require any external matching components?
   No. The filter is internally matched to 50 Ω. Simply place it in a 50 Ω transmission line (microstrip or coplanar waveguide), connect the ground pads to a solid ground plane, and it will perform to specification without any additional inductors, capacitors, or matching networks.

7. How does the SCLF‑225+ compare to other Mini‑Circuits low‑pass filters like the SCLF‑300+?
   Both share the same LTCC technology, 50 Ω impedance, and identical 1206 package. The difference is the cut‑off frequency: 225 MHz for the SCLF‑225+ and 300 MHz for the SCLF‑300+. Choose the SCLF‑225+ when your signal band must remain clean up to 225 MHz; select the SCLF‑300+ if you need a wider passband and can accept slightly less rejection near 225 MHz.

8. What are the most common applications for the SCLF‑225+ low‑pass filter?
   It is used in VHF/UHF transmitters to suppress harmonics, in receiver front‑ends for anti‑aliasing before ADCs, and in general‑purpose RF signal conditioning where low‑frequency signals up to 225 MHz must be preserved while higher‑frequency noise, clock harmonics, and interferers are removed. Typical systems include land‑mobile radios, IoT gateways, and test‑and‑measurement equipment.

9. Can the SCLF‑225+ be used in bidirectional RF systems?
   Yes. It is a passive, linear, bilateral device, so it filters identically in both directions. You can insert it anywhere in a bidirectional signal path—for example, between an antenna and a transceiver—without affecting reciprocity.

10. What is the operating temperature range of the SCLF‑225+?
    The filter is specified to operate from −40 °C to +85 °C, making it suitable for both indoor and outdoor equipment in a wide range of environmental conditions. Storage temperature extends from −55 °C to +100 °C.