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Vishay TCET1109 — Optoisolators
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Vishay / Optoisolators

TCET1109 Optocoupler, 5000Vrms, 4-DIP, Through Hole

MPN TCET1109
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Vishay TCET1109 optocoupler, 1-channel DC input, transistor output, 5000Vrms isolation, 4-DIP through-hole package, CTR 200-400% at 5mA, 70V output max, -40 to 100°C.

In Stock: 4,027 pcs
MOQ: 1 pcs
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[SPEC] Essential Parameters Snapshot Full Specifications (16)
Package / Case 4-DIP (0.300", 7.62mm)
Output / Current 50mA

Full Technical Specifications

16 Parameters
TCET1109 specifications
Parameter / AttributeSpecification / Value
Input typeDC
Output typeTransistor
MountingThrough Hole
Voltage - isolation5000Vrms
Voltage - output70V
Voltage - forward (Vf)1.25V
Current - output (Channel)50mA
Current transfer ratio400% @ 5mA
Current - DC forward (If)60 mA
Operating temperature-40°C ~ 100°C
PackageTube
Case4-DIP (0.300\", 7.62mm)
Channels1
Vce saturation300mV
Rise (Fall time)3µs, 4.7µs
Turn on (Turn off time)6µs, 5µs
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Technical Details & Description

5000Vrms isolation in a 4-DIP through-hole package

The Vishay TCET1109 is a single-channel transistor-output optocoupler in a 4-DIP (0.300", 7.62mm) through-hole package, rated for 5000Vrms isolation. It accepts a DC input and drives a phototransistor output capable of 50mA continuous current and 70V across the output. The current transfer ratio (CTR) is specified at 200% minimum and 400% maximum when the forward diode is driven at 5mA, giving a wide gain window for logic-level or relay-drive interfaces.

CTR range and switching timing

With CTR guaranteed between 200% and 400% at 5mA forward current, the TCET1109 provides a predictable transfer ratio that simplifies worst-case design for both minimum-drive and saturation-margin calculations. The typical turn-on time is 6µs and turn-off time 5µs, with rise and fall times of 3µs and 4.7µs respectively — fast enough for 10–20 kHz switching in isolated gate drives or status feedback loops. Vce saturation is limited to 300mV, keeping output voltage drop low when the transistor is fully on.

Frequently asked questions

What are the CTR min/max values for TCET1109?

The current transfer ratio is specified at 200% minimum and 400% maximum, both measured at a forward current of 5mA.

Can TCET1109 replace 4N35 or PC817?

The TCET1109 is a 4-DIP through-hole optocoupler with 5000Vrms isolation and a CTR range of 200–400% at 5mA. The 4N35 typically offers a CTR of 100–600% at 10mA, while the PC817 family has a wider CTR bin spread. Pin compatibility depends on the specific package variant — verify the pinout against your PCB footprint before substitution. The TCET1109's 5000Vrms rating is higher than the 4N35's 3550Vrms, which may matter for reinforced isolation requirements.

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