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PMK | Ultra-Fast Current Shunt UFCS

Ultra-Fast Current Shunts UFCS

UFCS (Ultra-Fast Current Shunts) are precision current-sensing shunts optimized for wide-bandgap (WBG) power device testing, offering >1 GHz bandwidth, <200 pH inductance, and compatibility with both traditional oscilloscopes and optical probes like FireFly®. Ideal for switching loss and high-speed pulse current measurements..

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  • Special Features
  • Specification

The UFCS series from PMK offers the highest precision for current measurement in fast-switching power electronics systems. Designed with power device engineers in mind, UFCS shunts combine ultra-wide bandwidth, extremely low parasitics, and flexible connection options, making them an ideal tool for accurate power loss characterization and high-speed diagnostics.

Each UFCS model features:

  • SMA signal output

  • Two conductive connection points:

    • “IN” (input) for the current source

    • “SHLD” (shield) for return/ground
      This configuration ensures all current flows through the shunt while minimizing interference and improving measurement fidelity.

They’re compatible with both direct 50 Ω oscilloscope inputs and optical probes (like FireFly®) using the proper adapter. The SHLD surface must be at the same electrical potential as oscilloscope ground when used in non-isolated setups.

Whether soldered, clamped, or wire-attached, UFCS shunts integrate easily into any test setup. Their rugged, open-frame design ensures durability and consistent performance even under harsh conditions or high-speed switching environments.

  • Bandwidth: Over 1 GHz for high-speed transient capture

  • Extremely low insertion inductance: <200 pH

  • Multiple resistance values: 1 mΩ, 5 mΩ, 11 mΩ, 24 mΩ, 52 mΩ

  • Signal output via SMA connector

  • Designed for WBG switching loss and pulse current analysis

  • Compatible with oscilloscopes, spectrum analyzers, and optical probes

  • Can be soldered or clamped into the circuit — no enclosure required

  • Operates safely with 50 Ω termination

  • Works with FireFly® optical probe using SMA–MMCX adapters

  • Robust and space-efficient for PCB or benchtop use

Parameter Value
Bandwidth >1 GHz
Insertion Inductance <200 pH
Available Resistances 1 mΩ, 5 mΩ, 11 mΩ, 24 mΩ, 52 mΩ
Output Connector Female SMA
Input Connection Solder pad/plate labeled “IN”
Return Connection (SHLD) Solder pad/plate labeled “SHLD”
Termination Requirement 50 Ω (internal or external terminator)
Oscilloscope Compatibility Any scope with 50 Ω input (or with terminator)
Applications WBG switching loss, pulse current testing, power electronics development