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Product Overview
DSE8S12 combines an 8A current rating and 1200V blocking capability with ultra-soft recovery in TO-220AC. It is intended for switching paths where reverse-current decay and voltage ringing matter to circuit design.
The device specifies 45ns 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 8A current rating.
● 45ns maximum reverse-recovery time under the specified 0.5A test condition.
● 3.2V maximum forward voltage at 8A and 25°C.
● 85A non-repetitive surge current for a 8.3ms pulse.
Key Specifications
| Parameter | Value and conditions |
| Configuration / package | Single diode / TO-220AC |
| Forward current | 8A |
| Repetitive peak reverse voltage | 1200V |
| Forward voltage | 1.60V typ at IF = 8A, Tj = 125°C 3.2V max at IF = 8A, Tj = 25°C |
| Reverse recovery time | 45ns max; Tj = 25°C, IF = 0.5A, IR = 1.0A, Irr = 0.25A |
| Surge current | 85A; non-repetitive, t = 8.3ms |
| Junction to case thermal resistance | 2.5°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 DSE8S12 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
● Industrial CCM converter stages.
● High-voltage freewheel paths.
● Switching power-supply clamp networks.
Ultra Soft Recovery in a Compact Package
The compact single-diode format suits lower-current high-voltage stages. Use the 45ns recovery limit as a defined test point, then evaluate the actual commutation waveform with the application current, temperature and circuit parasitics.
Design Notes
Design the cooling system for the actual current waveform and dissipation. The 8A 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 45ns recovery limit uses the low-current test condition in the parameter table. Evaluate recovery at the application current and temperature. The 85A surge specification is non-repetitive and must not be used as a repetitive overload rating.
FAQ
The 45 ns maximum is measured at 25°C with IF = 0.5 A, reverse current = 1 A and a 0.25 A recovery endpoint. Check the commutation waveform at the operating load.
It describes the shape of the reverse-current decay. A softer transition can reduce ringing, but it must be assessed in the actual commutation circuit.
They are different statistical and temperature conditions. Use maximum values for worst-case guarantees and typical values only for estimates.
CCM is a relevant use case, but suitability depends on voltage, current, frequency, recovery waveform, thermal design, and the companion switch.
