The TLP383(D4BLLTL,E is a single-channel optoisolator from Toshiba, built around a DC-input LED and a phototransistor output. Its headline rating is 5000Vrms of isolation — that is the voltage the part can withstand between input and output without breakdown, tested per the device standard. For a 230 VAC motor drive or a 48 VDC industrial sensor interface, that margin covers the transient spikes that couple across the barrier. The current transfer ratio (CTR) is specified at 200% minimum and 400% maximum, both measured at a forward current of 500µA. That means with 500µA into the LED, the output transistor can sink at least 1 mA and up to 2 mA — a wide enough window to guarantee the logic-level pull-up on the secondary side sees a clean low state. The 300mV Vce saturation ceiling at that drive keeps the voltage drop across the output low, so the downstream gate or microcontroller input stays well below its Vil threshold.
Temperature range and switching speed
If your board lives in an engine bay, a rooftop telecom enclosure, or a factory floor near a heat source, the 125°C upper limit gives you thermal headroom without derating the CTR or isolation. Typical rise and fall times are 2µs and 3µs respectively, with turn-on and turn-off times both at 3µs. That is fast enough for 10-20 kHz PWM signalling or a 100 kHz data line — the phototransistor will track the input without skewing the pulse width by more than a few microseconds.
Package and compliance
The TLP383(D4BLLTL,E comes in a 6-SOIC package with 4 leads — the standard small-outline footprint for optocouplers. The 0.173-inch body width and 4.40 mm height match the common SOIC-6 land pattern, so no board respin if you are swapping from another 4-pin SOIC opto. Lifecycle status is Active, and the part is ROHS3 compliant — no lead, no restricted substances under the current EU directive.
Sourcing and availability
The TLP383(D4BLLTL,E is an active Toshiba catalog item. We source it through our multi-distributor network and can quote against your BOM quantity.