Product Detail
- Circuit role: freewheel path.
- Options: FRD, ultrafast, Schottky.
- Stress: pulse current.
- Use case: inductive loads.
Product Description
This freewheeling diode page is for engineers and buyers selecting a diode path for inductors, coils, motors, relays and switching outputs. You can compare FRD, ultrafast and Schottky alternatives by current, reverse voltage, recovery speed, forward drop, surge behavior, package and heat path. A freewheeling diode gives inductive current a controlled route when a switch turns off, so placement and rating both matter. Lian Tuo helps you choose a practical part for the actual load instead of guessing from current alone. That keeps the diode choice tied to the actual inductive energy path.
Our Freewheeling Diode Options
| FRD Freewheeling Diode | Fast recovery option for inductive switching paths where recovery behavior matters. |
| Ultrafast Freewheeling Diode | Faster direction for high-frequency or sharper switching circuits with lower recovery loss. |
| Schottky Freewheeling Diode | Low-forward-drop choice for lower-voltage rails where leakage and voltage margin fit. |
| Power Freewheeling Diode | TO-220, TO-247 or module package for high-current inductive energy paths. |
| Axial Freewheeling Diode | Leaded option for relay coils, repair boards and simple through-hole assemblies. |
Feature Box
- Inductive EnergyDesigned around current recirculation after switching.
- Technology ChoiceFRD, ultrafast and Schottky routes are compared.
- Pulse ReviewPeak current and repetition rate are checked early.
- Package FitAxial, SMD and power packages support different loads.
Give Current A Path
A freewheeling diode protects the switch and circuit by giving inductive current a controlled path after turn-off. The right part depends on coil current, voltage, switching speed and package heat. Start from the load, because each inductive path releases energy differently. It also gives engineering a clearer reason for the package choice.
Choose Technology Carefully
Schottky, fast recovery and ultrafast diodes can all serve freewheel roles, but they behave differently. Schottky parts reduce drop on lower-voltage rails, while FRDs may suit higher voltage and switching stress. A freewheeling diode should match the actual circuit tradeoff. That keeps the diode choice tied to the actual inductive energy path.
Check Pulse Conditions
Average current is not enough for inductive loads. Peak current, pulse duration and repetition rate decide how hot the diode becomes. A freewheeling diode sample should be reviewed against the load cycle so it survives repeated switching, not only one event. It also gives engineering a clearer reason for the package choice.
Place It Sensibly
Long traces can add voltage spikes and slow protection response. The freewheeling diode should be placed close enough to the load or switch path to control energy cleanly. Lian Tuo can help compare packages once your layout and current path are known. That keeps the diode choice tied to the actual inductive energy path.
Vertical Product Applications
Relay Coil Protection
Use a freewheeling diode across relay coils when the switch needs protection from inductive kickback. The selected diode should match coil current, release-time needs and board space so the relay circuit remains stable and serviceable. It also gives engineering a clearer reason for the package choice. That keeps the diode choice tied to the actual inductive energy path.
Motor Driver Outputs
Motor driver outputs need freewheel paths that handle repeated current recirculation and heat. A freewheeling diode should be chosen by motor current, switching frequency and voltage margin, not only a simple current label. That keeps the diode choice tied to the actual inductive energy path. It also gives engineering a clearer reason for the package choice.
Output Choke Circuits
Output choke circuits in power supplies can use freewheeling diodes to manage stored energy during switching. The diode should match pulse stress, recovery speed and package cooling before it is approved for production. It also gives engineering a clearer reason for the package choice. That keeps the diode choice tied to the actual inductive energy path.
FAQ
How do I choose a freewheeling diode?
Start with load current, reverse voltage, switching frequency, pulse duration, package and temperature. Then decide whether Schottky, FRD or ultrafast behavior fits the circuit. The inductive load defines the stress. It also gives engineering a clearer reason for the package choice.
Is a Schottky diode good for freewheeling?
It can be good on lower-voltage rails where low forward drop is useful and leakage is acceptable. For higher voltage or hotter circuits, a fast recovery or ultrafast diode may be more practical. That keeps the diode choice tied to the actual inductive energy path.
Why does diode recovery matter?
Recovery behavior affects switching loss and stress when the circuit changes state. In fast switching power circuits, a slow freewheeling diode can heat up or disturb the switch waveform. It also gives engineering a clearer reason for the package choice.
Can a freewheeling diode slow relay release?
Yes. A diode across a relay coil can slow current decay and delay release. If release speed matters, the clamp method and diode choice should be reviewed with the relay circuit. That keeps the diode choice tied to the actual inductive energy path.
What data helps quote freewheel diodes?
Send load type, current, voltage, switching frequency, package target, circuit role and quantity. If the diode protects a motor, relay or choke, include the pulse condition or duty cycle. It also gives engineering a clearer reason for the package choice.
Can one diode protect many inductive loads?
Sometimes, but only if current, voltage and switching behavior are similar. Different coils or motors can release energy differently, so each load group should be checked before standardizing one diode. That keeps the diode choice tied to the actual inductive energy path.
Can Lian Tuo support freewheel equivalents?
Yes. We can compare FRD, ultrafast, Schottky, axial and power-package freewheeling diode options by rating, circuit role, package and availability before recommending samples. It also gives engineering a clearer reason for the package choice. That keeps the diode choice tied to the actual inductive energy path.
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