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Toshiba Semiconductor TLP388(TPL,E — Optoisolators
Toshiba Semiconductor

TLP388(TPL,E Optocoupler – 5000 Vrms, 350 V Output

MPNTLP388(TPL,E
End of Life

Toshiba Semiconductor TLP388(TPL,E, single-channel DC-input transistor-output optocoupler, 6-SOIC 4-lead package, 5000 Vrms isolation, 350 V output max, -55°C to 125°C operating range.

$0.78Ref. price · indicative, final on quote
TLP388(TPL,E datasheet
Packaging6-SOIC (0.173", 4.40mm Width), 4 Leads
StockContact for availability
MOQ1 pcs
  • 100% new & originalTraceable channels only — no refurbs, no pulls, no remarked parts.
  • Date & lot codes on quoteStated per line before you commit; label photos on request.
  • MSL-compliant ESD packingMoisture-sealed bags with indicator cards; reels photo-verified.
  • PayPal buyer protectionPay by T/T, PayPal or Payoneer — card payments covered end to end.

Specifications

TLP388(TPL,E Technical Specifications
ParameterValue
Input typeDC
Output typeTransistor
Mounting typeSurface Mount
Voltage - isolation5000Vrms
Voltage - output350V
Voltage - forward (Vf)1.25V
Current - output (Channel)50mA
Current transfer ratio600% @ 5mA
Current - DC forward (If)50 mA
Operating temperature-55°C ~ 125°C
PackageTape & Reel (TR); Cut Tape (CT)
Case6-SOIC (0.173\", 4.40mm Width), 4 Leads
Number of channels1
Vce saturation400mV
Rise (Fall time)2µs, 3µs
Turn on (Turn off time)3µs, 3µs

Product details

Isolation barrier and output voltage headroom

The TLP388(TPL,E delivers 5000 Vrms isolation in a 4-lead SOIC package — a reinforced-grade rating that supports safety certification for mains-referenced circuits without an external isolator. Output transistor is rated to 350 V maximum, which means it can directly switch loads on a 350 VDC rail, eliminating a secondary relay or MOSFET buffer.

CTR spread and switching speed for design margin

Current transfer ratio spans 50% to 600% at 5 mA forward current — a spread that forces the designer to bias the LED for the minimum CTR and verify saturation at the maximum. Rise and fall times are 2 µs and 3 µs typical, with matched turn-on and turn-off times of 3 µs each — adequate for low-speed logic isolation.

Temperature grade and production status

Rated for -55°C to 125°C, the TLP388(TPL,E fits avionics, downhole instrumentation, and outdoor telecom where the ambient swings beyond commercial limits.

Frequently asked questions

What is the current transfer ratio (CTR) of TLP388(TPL,E)?

CTR is specified at 50% minimum and 600% maximum, both measured at IF=5 mA. The wide spread means the LED drive current must be sized for the minimum CTR to guarantee output saturation across all units.