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Toshiba Semiconductor TLP387(D4-TPR,E — Discrete Semiconductors

TLP387(D4-TPR,E Optoisolator – Darlington Output, 5000 Vrms

MPNTLP387(D4-TPR,E
End of Life

Toshiba TLP387(D4-TPR,E, single-channel Darlington-output optocoupler, 5000 Vrms isolation, 300 V VCEO, 150 mA output, 1000% min CTR at 1 mA, 6-SOIC-4 lead package, surface mount, active and RoHS compliant.

$0.85Ref. price · indicative, final on quote
Toshiba Semiconductor TLP387(D4-TPR,E datasheet (PDF)
Packaging6-SOIC (0.173", 4.40mm Width), 4 Leads
RoHSRoHS Compliant
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

TLP387(D4-TPR,E specifications
ParameterValue
Input typeDC
Output typeDarlington
MountingSurface Mount
Voltage - isolation5000Vrms
Voltage - output300V
Voltage - forward (Vf)1.25V
Current - output (Channel)150mA
Current transfer ratio1000% @ 1mA
Current - DC forward (If)50 mA
Operating temperature-55°C ~ 110°C
PackageTape & Reel (TR); Cut Tape (CT)
Case6-SOIC (0.173\", 4.40mm Width), 4 Leads
Channels1
Vce saturation1V
Rise (Fall time)40µs, 15µs
Turn on (Turn off time)50µs, 15µs

Product details

What this Darlington optocoupler does for your board

The TLP387(D4-TPR,E is a single-channel DC-input Darlington-output optocoupler from Toshiba, housed in a 6-SOIC surface-mount package with 4 leads. It provides 5000 Vrms of galvanic isolation between the LED side and the photodarlington output, making it a solid choice for industrial controls, PLC I/O modules, and motor-drive interface circuits where noise immunity and safety isolation are required. The minimum current transfer ratio is 1000% at 1 mA forward current.

Output voltage and current — what you can actually drive

The output stage is rated for a maximum collector-emitter voltage of 300 V and can sink up to 150 mA continuously per channel. Switching speed is modest — turn-on time is 50 µs typical, turn-off is 15 µs, with rise and fall times of 40 µs and 15 µs respectively. This part is not for high-frequency PWM or data transmission; it is for on/off control at line-rate or slower, like enabling a power supply or latching a contactor.

Is it still in production? Sourcing and lifecycle

For volume BOM lines, we source and quote to order against your quantity — no stock-holding claim, but we can confirm availability and pricing at quote time.

The 6-SOIC package has a 0.173-inch body width and 4.40 mm height, with only 4 leads populated — the centre two pins are omitted for creepage distance. The 4-lead layout is standard for high-voltage optocouplers, and the footprint matches common 6-SOIC patterns. Surface-mount assembly is straightforward with standard reflow profiles.

Frequently asked questions

What is the current transfer ratio of TLP387(D4-TPR,E?

The minimum CTR is 1000% at 1 mA forward current, meaning the output collector current is at least 10 mA when the LED is driven with 1 mA. Typical values are higher, but the 1000% floor is the guaranteed switching point for your design.

What is the closest functional second-source to TLP387(D4-TPR,E?

The TLP387(TPR,E is the same die in a different reel packaging variant — functionally identical. For a lower-output-current alternative, the TLP388(GB-TPL,E offers a transistor output with 400 mV Vce(sat) and faster switching (2 µs rise, 3 µs fall), but its output is limited to 50 mA and 300 V. If you need the Darlington gain and 150 mA drive, stick with the TLP387 family.