FLT-4 Power Supply Filter
An inline, Pi-style module engineered for our FIT (Fault Injection Toolbox) board series, the FLT-4 delivers lab-grade core-rail isolation. Drop it into your FIT board and experience useful attenuation of I/O switching and EMI noise—so your shunt-based CPU current measurements reveal pure instruction-level activity.
Plug FLT-4 into your FIT board in seconds—no PCB mods, no solder. Enjoy cleaner waveforms, tighter fault windows, and the confidence that your VCC noise floor is fully under control.
Key Features:
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Delivers rock-solid logic thresholds on JTAG, UART, ISP and other pull-up lines
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Suppresses switching noise above a few kilohertz for clearer shunt-based current traces
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Operates over an wide temperature range (–40 °C to +85 °C)
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Plug-and-play 3-pin header (IN, OUT, GND; 2.54 mm pitch)
Technical Specifications
| Stage | Component | Spec |
|---|---|---|
| 1. Feed-through Capacitor | 3-terminal, 1 nF, 100V | Front-end EMI choke |
| 2. Pi Inductor | 1 µH, 5.1 A, 16 mΩ | Mid-band attenuation, low insertion loss |
| 3. Pi Capacitor | 100 nF, 50 V, X7R | Bulk HF decoupling |
| 4. Ferrite Bead | 600 Ω @100 MHz, 0.7 A, 210 mΩ DCR | Final-stage HF cleanup |
| DC Current Rating | 0.7 A | Continuous core supply loads |
| DC Resistance (DCR) | 226 mΩ | Minimal voltage drop |
| Cutoff Frequency (–3 dB) | ~500 kHz (1 µH + 100 nF) | Bases of Pi filter |
| HF Attenuation | >40 dB @10 MHz; >60 dB @100 MHz | Measured in typical lab-bench environment |
| Operating Temperature | –40 °C … +85 °C | Wide temperature range |
Why You Need It
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Pristine Core-Rail for Profiling: Aggressively block I/O and EMI transients (SPI, UART, JTAG, etc.) to ensure the only currents on your shunt come from CPU, flash, and RAM activity.
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Consistent Fault-Injection Results: Stable VCC prevents random trigger shifts caused by rail bounce, giving you reproducible fault-injection windows.
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Ultra-High Noise Rejection: Provides at least 40 dB attenuation at 10 MHz and 60 dB at 100 MHz on the power rail, ensuring that all switching and EMI spikes above the ~500 kHz cutoff are suppressed.
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Plug-and-Play Integration: Simply replace the stock VCC jumper with FLT-4’s 3-pin header—no soldering or schematic updates required.
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Industrial-Strength Durability: Rated for –40 °C to +85 °C and up to 0.7 A continuous current, FLT-4 thrives in any test-lab environment.
- High-Fidelity π Filter for Shunt-Based MCU Profiling: A 4th-order π low-pass with a 500 kHz corner, ≥ 40 dB @ 10 MHz and ≥ 60 dB @ 100 MHz. Rated 0.7 A continuous, ~226 mΩ DCR, –40 °C…+85 °C. Tap your shunt resistor or probe at the VDD output for lab-grade supply cleanliness—no extra bulk capacitance to blunt crowbar pulses.