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| Part Number | BD745-S | BD745C-S | BD745A-S | BD745B-S | BD746-S | BD545-S | BD645-S | BD743-S | BD744-S | 
|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Bourns Inc. | Bourns Inc. | Bourns Inc. | Bourns Inc. | Bourns Inc. | Bourns Inc. | Bourns Inc. | Bourns Inc. | Bourns Inc. | 
| Product Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | 
| Transistor Type | NPN | NPN | NPN | NPN | PNP | NPN | NPN - Darlington | NPN | PNP | 
| Current - Collector (Ic) (Max) | 20 A | 20 A | 20 A | 20 A | 20 A | 15 A | 8 A | 15 A | 15 A | 
| Voltage - Collector Emitter Breakdown (Max) | 45 V | 110 V | 60 V | 80 V | 45 V | 40 V | 60 V | 45 V | 45 V | 
| Vce Saturation (Max) @ Ib, Ic | 3V @ 5A, 20A | 3V @ 5A, 20A | 3V @ 5A, 20A | 3V @ 5A, 20A | 3V @ 5A, 20A | 1V @ 2A, 10A | 2.5V @ 50mA, 5A | 3V @ 5A, 15A | 3V @ 5A, 15A | 
| Current - Collector Cutoff (Max) | 1µA | 100µA | 1µA | 1µA | 100µA | 700µA | 500µA | 100µA | 100µA | 
| DC Current Gain (hFE) (Min) @ Ic, Vce | 20 @ 5A, 4V | 20 @ 5A, 4V | 20 @ 5A, 4V | 20 @ 5A, 4V | 20 @ 5A, 4V | 10 @ 10A, 4V | 750 @ 3A, 3V | 20 @ 5A, 4V | 20 @ 5A, 4V | 
| Power - Max | 3.5 W | 3.5 W | 3.5 W | 3.5 W | 3.5 W | 3.5 W | 2 W | 2 W | 2 W | 
| Frequency - Transition | - | - | - | - | - | - | - | - | - | 
| Operating Temperature | -65°C ~ 150°C (TJ) | -65°C ~ 150°C (TJ) | -65°C ~ 150°C (TJ) | -65°C ~ 150°C (TJ) | -65°C ~ 150°C (TJ) | -65°C ~ 150°C (TJ) | -65°C ~ 150°C (TJ) | -65°C ~ 150°C (TJ) | -65°C ~ 150°C (TJ) | 
| Mounting Type | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | 
| Package / Case | TO-218-3 | TO-218-3 | TO-218-3 | TO-218-3 | TO-218-3 | TO-218-3 | TO-220-3 | TO-220-3 | TO-220-3 | 
| Supplier Device Package | SOT-93 | SOT-93 | SOT-93 | SOT-93 | SOT-93 | SOT-93 | TO-220 | TO-220 | TO-220 |