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Toshiba Semiconductor TLP385(D4-GB,E — Optoisolators

TLP385(D4-GB,E Toshiba Optoisolator 5000Vrms 4-SOIC Active

MPNTLP385(D4-GB,E
End of Life

Toshiba Semiconductor TLP385(D4-GB,E, 1-channel DC-input transistor-output optocoupler, 5000Vrms isolation, CTR 100%–600% at 5mA, -55°C to 110°C, 6-SOIC 4-lead surface-mount package, Tube.

$0.54Ref. price · indicative, final on quote
Toshiba Semiconductor TLP385(D4-GB,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

TLP385(D4-GB,E specifications
ParameterValue
Input typeDC
Output typeTransistor
MountingSurface Mount
Voltage - isolation5000Vrms
Voltage - output80V
Voltage - forward (Vf)1.25V
Current - output (Channel)50mA
Current transfer ratio600% @ 5mA
Current - DC forward (If)50 mA
Operating temperature-55°C ~ 110°C
PackageTube
Case6-SOIC (0.173\", 4.40mm Width), 4 Leads
Channels1
Vce saturation300mV
Rise (Fall time)2µs, 3µs
Turn on (Turn off time)3µs, 3µs

Product details

The TLP385(D4-GB,E delivers 5000Vrms isolation in a 4-lead SOIC footprint — enough for reinforced insulation in mains-referenced PSU feedback loops and PLC digital input modules. The CTR floor of 100% at 5mA forward current (max 600%) means the LED drive can be set conservatively without losing output saturation at 80V/50mA, even over the full -55°C to 110°C range.

Switching speed and saturation — timing margin for digital isolation

Typical turn-on/turn-off times are 3µs each, with rise/fall of 2µs/3µs. That puts the usable switching frequency around 100 kHz for logic-level signals — adequate for 24V PLC input debounce, relay coil drive, and isolated I²C bit-banging. The 300mV max Vce(sat) at 50mA output keeps the low-side voltage drop inside a logic-high threshold for 3.3V or 5V domains.

Package and mounting — 4-lead SOIC vs 6-lead trade-off

The two unused centre pins (2,3) are omitted, which increases creepage distance between input and output for the 5000Vrms rating.

RoHS compliant.

Frequently asked questions

What is the CTR of TLP385(D4-GB,E?

Current transfer ratio is 100% minimum, 600% maximum, both specified at IF=5mA. That wide range gives flexibility in LED drive current — a 1mA forward current still guarantees at least 20% CTR, enough to saturate the output transistor at low collector current.

Can TLP385(D4-GB,E replace TLP185?

Not directly — the TLP185 is a 4-pin SSOP with lower isolation (3750Vrms) and a different CTR bin. The TLP385(D4-GB,E has 5000Vrms and a wider CTR range, so it can work as a functional upgrade if the footprint (SOIC-4 vs SSOP-4) and creepage requirements align. Verify the pad layout — the TLP385 uses a 6-SOIC body with 4 leads, so the PCB land pattern is different from the TLP185's 4-pin SSOP.