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onsemi 6N138V — Optoisolators

6N138V onsemi Optoisolator, 1Ch Darlington, 2500Vrms, DIP-8

MPN6N138V
Obsolete

onsemi 6N138V optoisolator, 1-channel, DC input, Darlington with Base output, 300% CTR min, 2500Vrms isolation, Through Hole, 8-DIP (0.300", 7.62mm).

$1.0800Ref. price · indicative, final on quote
onsemi 6N138V datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

6N138V specifications
ParameterValue
Input typeDC
Output typeDarlington with Base
MountingThrough Hole
Voltage - isolation2500Vrms
Voltage - output7V
Voltage - forward (Vf)1.3V
Current - output (Channel)60mA
Current transfer ratio300% @ 1.6mA
Current - DC forward (If)20 mA
Operating temperature-40°C ~ 85°C
PackageBulk
Case8-DIP (0.300\", 7.62mm)
Channels1
Turn on (Turn off time)1.5µs, 7µs

Product details

Obsolete — last-time-buy sourcing channel

The 6N138V is officially listed as Obsolete by onsemi.

Darlington output and CTR floor

The 6N138V uses a Darlington with Base output stage, delivering a minimum current transfer ratio (CTR) of 300% at a forward current of 1.6 mA. That CTR floor means the output can sink 60 mA while the input LED draws only a few milliamps — a common choice for logic-level isolation in PLC digital inputs or sensor interfaces where the load side needs higher current gain than a phototransistor provides. The switching times are 1.5 µs turn-on and 7 µs turn-off typical. For a 24 VDC PLC input module sampling at 1 kHz, the 7 µs turn-off is fast enough; above 50 kHz the output rise time starts to limit the data rate.

Isolation and temperature range

Rated for 2500 Vrms isolation between input and output — sufficient for basic insulation in industrial control equipment per IEC 60950-1 reinforced isolation requirements. The 8-DIP (0.300", 7.62mm) through-hole package fits standard 0.100-inch pitch sockets or solders directly into a PCB with 0.300-inch row spacing.

Frequently asked questions

What is the closest pin-compatible alternative to 6N138V?

The 6N138 (without the V suffix) shares the same die and pinout but may carry a different RoHS or lead-free status — verify the date code and compliance documentation before substituting. For new designs, consider a current-production single-channel Darlington optoisolator in DIP-8 from onsemi or a second source, but expect a board spin if the pinout differs.

What compliance documentation does onsemi provide for 6N138V?

The evidence does not list specific compliance certifications (RoHS, REACH, UL, IEC) for this part. As an Obsolete device, the original onsemi datasheet and PCN documents are the authoritative source — request those at RFQ time. The part is not marked as AEC-Q101 qualified.