SCLF-65+ Mini-Circuits SMD RF Low Pass Filter 71MHz Cutoff 50Ω 1dB Insertion Loss

SCLF-65+ Product Overview

The SCLF-65+ is a 50Ω surface-mount RF low pass filter from Mini-Circuits, a world-leading manufacturer of RF and microwave components. it features a 3dB cutoff frequency of 71MHz, a passband from DC to 65MHz, and a typical insertion loss of only 1dB. The device provides >20dB rejection above 86MHz and >40dB rejection above 96MHz. It is widely used in broadcasting, radar systems, transceivers, satellite communications, and other RF front‑end applications.

SCLF-65+ Core Features

Low Insertion Loss： Typical insertion loss of only 1dB, minimizing signal attenuation

Passband Range： DC to 65MHz passband with 71MHz 3dB cutoff frequency

High Rejection： >20dB rejection above 86MHz, >40dB rejection above 96MHz

50Ω Impedance Matching： Standard 50Ω characteristic impedance

Wide Operating Temperature： -40℃ to +85℃

RoHS Compliant： RoHS 3 compliant

Active Product Status： Active, with stable supply

SCLF-65+ 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

Transceiver Systems： RF front‑end filtering in transceivers

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

Test Equipment： Signal filtering in laboratory test equipment

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

SCLF-65+ 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

Wide Passband Covers Baseband Applications： DC-65MHz passband with 71MHz cutoff enables one device to serve multiple RF front‑end filtering needs

Excellent Out‑of‑Band Rejection： >20dB rejection above 86MHz and >40dB rejection above 96MHz effectively filter high‑frequency interference

Wide Temperature Stability： -40℃ to +85℃ operating temperature range for demanding environments

RoHS Compliant： Meets RoHS 3 environmental standards

Active Supply Status： Part status is “Active” with stable supply

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FAQ:

1. What is the Mini‑Circuits SCLF‑65+ and what is its exact cut‑off frequency?
   The SCLF‑65+ is a miniature LTCC low‑pass filter in an 8‑lead SMD package. Its typical 3 dB cut‑off frequency is 65 MHz, not 71 MHz. The passband extends from DC to 65 MHz, and the filter is designed to strongly attenuate signals above this frequency while maintaining a nominal 50 Ω impedance.

2. What is the typical insertion loss of the SCLF‑65+, and what does that mean for my system?
   The typical insertion loss in the passband is 1.0 dB. This means the filter absorbs only about 20 % of the signal power. Combined with a typical return loss of 14 dB (VSWR 1.5:1), it ensures a good match to 50 Ω systems with minimal signal reflection.

3. How much stopband attenuation does the SCLF‑65+ provide? At what frequency does it start to reject signals?
   The filter provides excellent high‑frequency rejection. The stopband attenuation increases rapidly above 65 MHz, with typical rejection reaching 20 dB at 110 MHz and 40 dB at 250 MHz. This effectively suppresses harmonics, out‑of‑band interference, and other unwanted high‑frequency content before it reaches sensitive circuitry.

4. What is the maximum RF input power the SCLF‑65+ can handle?
   The SCLF‑65+ is rated for a maximum RF input power of 10 W (+40 dBm) at 25 °C. It can be used in moderate‑power transmitter filtering or receiver front‑ends, provided the operating temperature limits are observed and power derating is applied at higher ambient temperatures.

5. What is the package size and what does “8‑SMD” mean?
   The filter comes in a tiny 3.2 mm × 1.6 mm (1206 style) ceramic body with 8 surface‑mount terminals. The eight pads consist of four signal connections and four ground pads, making it ideal for compact, high‑density PCB layouts. It is fully compatible with standard reflow soldering processes.

6. Does the SCLF‑65+ 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 the device will perform to specification without any additional inductors or capacitors.

7. How does the SCLF‑65+ compare to similar Mini‑Circuits low‑pass filters like the SCLF‑70+?
   The SCLF‑65+ and SCLF‑70+ share the same LTCC technology, 50 Ω impedance, and identical package size. The only difference is the cut‑off frequency: 65 MHz for the SCLF‑65+ and 70 MHz for the SCLF‑70+. Choose the SCLF‑65+ when your signal band must extend up to 65 MHz; use the SCLF‑70+ if you need a slightly wider passband and can accept slightly less rejection below 70 MHz.

8. What are the most common applications for the SCLF‑65+ low‑pass filter?
   It is used in RF transmitters to attenuate harmonic and spurious emissions, in receiver front‑ends for anti‑aliasing before ADC sampling, and in general‑purpose signal conditioning where low‑frequency signals must be preserved while high‑frequency noise is removed. Typical systems include VHF communication equipment, IF stages, and test‑and‑measurement instruments.

9. Can the SCLF‑65+ 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 without affecting reciprocity, such as between an antenna and a transceiver.

10. I need a low‑pass filter with a 71 MHz cut‑off. Is the SCLF‑65+ suitable?
    The SCLF‑65+ has a 65 MHz nominal 3 dB cut‑off. If your signal contains significant energy between 65 MHz and 71 MHz, this filter will attenuate those frequencies. For a 71 MHz cut‑off, consider the Mini‑Circuits SCLF‑70+ (70 MHz) or another filter explicitly rated for 71 MHz. Always check the data sheet for the exact passband and rejection specifications before making a design decision.