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2 parts compared · 21 differing specs across 21 total parameters.

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Specification differences for HCPL-3120, TLP250
Parameter
Voltage - Isolation3750Vrms-
Operating temperature-40°C~100°C-
Voltage - Forward (vf)1.5V-
Voltage - Output Supply15V ~ 30V-
Case8-DIP (0.300\", 7.62mm)DIP-8 (gate-drive optocoupler)
PackageTube-
ApprovalsCSA, UR-
Channels1-
Common Mode Transient Immunity25kV/µs-
Component Category-Gate Drive Optocouplers
Current - Dc Forward (if)25 mA-
Current - Output High, Low2A, 2A-
Current - Peak Output2.5A-
Market Reality-This eight-pin row is how inverter, servo and welder drive boards cross the isolation barrier to fire their IGBTs: TLP250 from Toshiba, HCPL-3120/A3120 from the Avago lineage, FOD3120 from the Fairchild line - four houses, one socket, and a repair literature that swaps them by name. The selection axis is output current (TLP250 at a 1.5A peak against the 2.5A class of its successors) and input threshold (the 3120 triggers from a lower LED current), and the design axis is the negative gate rail that keeps Miller capacitance from re-triggering the IGBT. In repair, the row behaves; what re-fails is the rail and the bypass capacitor the procedure keeps forgetting.
MountingThrough Hole-
Propagation Delay Tplh (tphl)500ns, 500ns-
Pulse Width Distortion300ns-
Rise (fall Time)100ns, 100ns-
Role In Circuit-Original Reference Part
Sourcing Status-Active Shenzhen Spot Sourcing (24–48h)
TechnologyOptical Coupling-

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