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Product Overview
DSE15H12 is a 15A 1200V soft-recovery rectifier in TO-220AC for boost, flyback and auxiliary power stages. It combines a compact two-lead format with forward-voltage and recovery data for loss and waveform evaluation.
The device specifies 60ns maximum reverse-recovery time under a defined 0.5A test condition. Forward-voltage and thermal data support evaluation of the diode within the complete cooling and switching circuit.
Key Features
● 1200V repetitive peak reverse voltage with a 15A current rating.
● 60ns maximum reverse-recovery time under the specified 0.5A test condition.
● 2.1V maximum forward voltage at 15A and 25°C.
● 200A non-repetitive surge current for a 8.3ms pulse.
Key Specifications
| Parameter | Value and conditions |
| Configuration / package | Single diode / TO-220AC |
| Forward current | 15A |
| Repetitive peak reverse voltage | 1200V |
| Forward voltage | 1.40V typ at IF = 15A, Tj = 125°C 2.1V max at IF = 15A, Tj = 25°C |
| Reverse recovery time | 60ns max; Tj = 25°C, IF = 0.5A, IR = 1.0A, Irr = 0.25A |
| Surge current | 200A; non-repetitive, t = 8.3ms |
| Junction to case thermal resistance | 2.0°C/W |
| Junction temperature range | −55°C to +175°C |
Current capability depends on case temperature and cooling. Use the datasheet derating curve when determining operating current.
Electrical Configuration and Pinout
With the marking face toward you and the leads pointing down, the left lead is K (cathode) and the right lead is A (anode). The exposed mounting tab is electrically connected to K.
Figure 1. Circuit and connection detail from the DSE15H12 datasheet, page 1. A = anode; K = cathode.
| Connection | Function |
| Left lead | K — cathode |
| Right lead | A — anode |
| Metal tab | K — electrically connected to the cathode |
Typical Applications
● DCM boost rectification.
● Flyback converter rectification.
● High-voltage industrial auxiliary supplies.
15A Soft Recovery for High Voltage Conversion
DSE15H12 provides a moderate-current soft-recovery option where TO-220AC mounting is preferred. Balance its conduction characteristics with turn-off behavior and the cooling available in the finished assembly.
Design Notes
Design the cooling system for the actual current waveform and dissipation. The 15A rating is not an unconditional free-air operating current. Check reverse-voltage peaks, including switching transients, against 1200V.
The metal tab carries the cathode potential. If the heatsink must remain at a different potential, use an appropriate insulating mounting interface and include its thermal resistance.
The 60ns recovery limit uses the low-current test condition in the parameter table. Evaluate recovery at the application current and temperature. The 200A surge specification is non-repetitive and must not be used as a repetitive overload rating.
FAQ
Its positioning emphasizes conduction performance in stages where diode current falls to zero. Actual mode and benefit depend on the converter waveform.
It is the stated maximum under one test. Recovery softness, charge, current slope, voltage, and temperature can matter as much as the time number.
The datasheet identifies the back metal as cathode, so it is electrically active.
Only after checking current, surge, VF, trr, thermal resistance, package drawing, and the effect on the switching waveform.
