1️⃣ Current Parameters Overview
Current ratings define the operational limits and capabilities of our devices. Average current values specify continuous operational limits under defined thermal conditions, while peak and surge ratings indicate maximum transient current handling capability. Gate characteristics determine thyristor triggering requirements and maintaining conditions.
| Symbol | Parameter | Description | Related Product Series |
|---|---|---|---|
| IF(AV) | Average forward current | Continuous current through a diode or rectifier under defined thermal conditions. | Bridge Rectifiers |
| IT(AV) | Average on-state current | Continuous current through a thyristor during conduction. | Three-Phase SCR |
| IFM / ITM | Peak collector / on-state current | Maximum current the device can withstand for short durations (non-repetitive). | Same as above |
| IFSM / ITSM | Surge forward / on-state current | Non-repetitive surge current rating for short pulses. | High Power Modules |
| IG / IGT / IH | Gate current / trigger / holding | Defines thyristor gate drive requirements. | SCR Modules |
| IRRM | Repetitive peak reverse current | Maximum reverse leakage in blocking state. | Bridge Rectifiers |
2️⃣ Voltage Characteristics
Voltage parameters establish the electrical boundaries for device operation. Repetitive peak ratings define maximum allowable reverse bias voltages. Forward voltage drops determine conduction losses and thermal requirements. Gate voltages specify trigger thresholds, and insulation voltage ensures safety compliance.
| Symbol | Parameter | Description | Related Product Series |
|---|---|---|---|
| VRRM / VDRM | Repetitive peak voltage / Off-state voltage | Maximum voltages the device can withstand repeatedly. | Bridge Rectifiers / Phase Control Thyristors |
| VF / VFM / VT / VTM | Forward / On-state voltage (peak) | Voltage drop during conduction. | All SCR / Rectifier Modules |
| VGT / VGD | Gate trigger / un-trigger voltage | Threshold voltages to turn ON/OFF SCR. | SCR Modules |
| Viso | Insulation voltage | Ensures electrical isolation compliance. | All Modules |
3️⃣ Dynamic Performance Metrics
Switching characteristics critically impact device behavior in operational circuits. Recovery parameters characterize switching losses and reverse recovery behavior. Rate parameters define critical transition capabilities for reliable operation. Turn-off time specifies thyristor commutation characteristics.
| Symbol | Parameter | Description | Related Product Series |
|---|---|---|---|
| trr | Reverse recovery time | Time for diode to recover after reverse voltage. | Fast Recovery Diodes |
| Qrr | Recovered charge | Charge released during reverse recovery. | Fast Recovery Diodes |
| di/dt / dv/dt | Rate of rise of current / voltage | Specifies critical transition limits for reliable operation. | SCR Modules |
| tq | Turn-off time | Time required for thyristor to turn off. | SCR Modules |
4️⃣ Thermal Management Parameters
Thermal specifications govern device power handling capabilities. Proper thermal management ensures device reliability and longevity. Thermal resistance values define heat transfer paths, and temperature ratings establish operational and storage limits.
| Symbol | Parameter | Description | Related Product Series |
|---|---|---|---|
| Rth(j-c) / Rth(j-hs) / Rth(c-hs) / Rth(hs-a) | Thermal resistance | Heat transfer from junction to case, heatsink, and ambient. | All Modules / SCR / Rectifiers |
| Zth | Transient thermal impedance | Short-term pulse power response. | High Power Modules |
| Tj / Tjm / Tc / THS / Ta | Temperature ratings | Operational, maximum junction, case, heatsink, and ambient limits. | All Modules |
5️⃣ Application Considerations
When selecting components, consider both static and dynamic parameter requirements. Ensure adequate margin between application requirements and device ratings. Thermal design must account for worst-case operating conditions. Gate drive circuits must meet or exceed trigger requirements for reliable thyristor operation. Always consult complete datasheets for detailed specification limits and application conditions.
For technical support or product selection assistance, please contact our engineering team or browse our full range of Power Semiconductor Modules.
