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6N139M

onsemi

onsemi 6N139M, single-channel DC-input Darlington optocoupler, 5000Vrms isolation, 500% min CTR at 1.6mA, 18V output max, 60mA output current, 8-DIP through-hole package, tube, -40°C to 100°C.

onsemi 6N139M
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[IN STOCK] In Stock: 323 pcs
$1.09/ pc

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MOQ 1 · Tube · RoHS · EIA-481 · DAP/DDP · T/T

[ORIGINAL SEALED] [PRE-SHIP HD PHOTOS] [30D WARRANTY · COC] [TRACKED DAP/DDP]

Technical specifications

6N139M specifications
Parameter / AttributeSpecification / Value
Input typeDC
Output typeDarlington with Base
MountingThrough Hole
Voltage - isolation5000Vrms
Voltage - output18V
Voltage - forward (Vf)1.3V
Current - output (Channel)60mA
Current transfer ratio500% @ 1.6mA
Current - DC forward (If)20 mA
Operating temperature-40°C ~ 100°C
PackageTube
Case8-DIP (0.300\", 7.62mm)
Channels1
Turn on (Turn off time)240ns, 1.3µs
100% Footprint Match · Solder-Ready (No PCB Redesign Needed)

Need Stock or a Drop-in Second-Source for 6N139M?

Package: DIP-8 / SOP-8 · Pin-compatible replacements with immediate Shenzhen spot stock

Footprint Match 97%
Supply Chain & Allocation Reality:

The 6N137 is the industrial signal isolator of servo drives, PLC I/O, gate-drive interfaces and serial links: a 10 megabit logic-gate optocoupler with a Schottky-clamped open-collector output, an enable pin, and the same 8-pin body as half the opto universe. Two things make it a page of its own. First, the 6N136 it shares a family name with is a 1 megabit phototransistor part whose pins 5, 6 and 7 mean something else entirely - same body, different species. Second, the enable pin: floating it disables the output to a permanent high, which is the number one mystery of hand-wired 6N137 circuits. The 2500V isolation, ~45-75ns delays and the HCPL-2601/2611 noise-shielded versions complete the working picture.

Verified Pin-Compatible Replacements (3 verified alternatives)

6N136 LiteOn / onsemi / Isocom DIP-8
Functional Equivalent
Availability & Target Pricing:

The 1Mbps Phototransistor Sibling

Shenzhen Spot Stock (24-48h Dispatch)

Electrical & Core Specs:

The phototransistor version in the same 8-pin body: no VCC pin, no enable pin, CTR-based output with a base pin (7) for a speed resistor, and about one megabit of bandwidth.

No logic supply at all - the output side is a transistor, not a gate: the pin that is VCC on a 6N137 is unused on the 6N136.

Compatibility & Drop-In Notes: The honest use of this card: replacing a slow part with the 10Mbps logic-gate family is an upgrade that needs decoupling and a pull-up; replacing the 137 with the 136 is a redesign that loses the enable, the logic output and the speed.
Package & Solder Footprint: Read the pin drawing, never the family name - the LED side matches, the output side does not.
Shenzhen Warehouse Stock & MOQ: Stocked; the slow lane with its differences stated.
Request Volume Quote for 6N136 Compare 6N139M vs 6N136 Spec Matrix
HCPL-2601 Broadcom (HP lineage) DIP-8
100% Drop-in (Zero Code Change)
Availability & Target Pricing:

The Noise-Shielded Same Function

Shenzhen Spot Stock (24-48h Dispatch)

Electrical & Core Specs:

The same 10 megabit logic-gate design from the HP/Avago lineage with a specified improved internal noise shield - the minimum common-mode immunity is a guaranteed number where the 6N137 datasheets lean on typicals.

Same 5V logic side and enable-pin dance; the HCPL-2611 raises the guaranteed CMR further for the nastiest motor-drive corners.

Compatibility & Drop-In Notes: The choice rule: where a 6N137 works, the 2601 works identically; where a 6N137 glitches mysteriously near power switching, the specified-immunity part is the repair - not a faster pull-up.
Package & Solder Footprint: Pin-shared with the 6N137.
Shenzhen Warehouse Stock & MOQ: Stocked; the datacom-name version of the same socket.
Request Volume Quote for HCPL-2601 Compare 6N139M vs HCPL-2601 Spec Matrix
EL2601 / ICPL2601 Everlight / Isocom (clone lineage) DIP-8 / SOP-8
100% Drop-in (Zero Code Change)
Availability & Target Pricing:

The Volume Clone Shelf

Shenzhen Spot Stock (24-48h Dispatch)

Electrical & Core Specs:

The industry clones of the 2601/6N137 function: 10 megabit, open-collector Schottky-clamped output, enable input, same pin map - at the price points that put them in serial and adapter hardware.

The enable pin carries its own discipline: about 5.5V maximum and never more than 500mV above VCC - a rule worth stating because it is the first pin killed in hand-built rigs.

Compatibility & Drop-In Notes: The clones exist because the original function is generic; the buying question is only whether the lot behind the price holds the datasheet numbers.
Package & Solder Footprint: Pin map identical to the 6N137/2601 line.
Shenzhen Warehouse Stock & MOQ: Volume pricing; sample-screened lots on request.
Request Volume Quote for EL2601 / ICPL2601 Compare 6N139M vs EL2601 / ICPL2601 Spec Matrix
Buyer & Quality Checklist for Sourcing Alternatives
  • The enable pin (pin 7) has a truth table, not a default: tied high the output follows the input inverted (input high gives output low); floating or tied low it disables to a permanent high. The always-high 6N137 is almost always an orphaned enable pin.
  • The output is open-collector and inverting: it sinks when the input LED is on - a pull-up resistor is a functional part of the circuit, and positive-logic assumptions about the output polarity need the inversion designed in.
  • The 6N136 shares the body and moves the pins: on the 136, pins 5/6/7 are Emitter/Collector/Base (phototransistor world, no VCC, no enable); on the 137 they are GND/Output/Enable. Never swap across the two by position.
  • VCC (pin 8) is 4.5V to 5.5V with the 0.1uF bypass to pin 5 as part of the design: a 10 megabit part without its decoupling produces the intermittent glitches that get blamed on the processor.
  • The speed ladder inside the family is real: 6N135/6N136 are 1 megabit phototransistor parts; 6N137/6N138/6N139 are the 10 megabit logic-gate row, with 138/139 tuned for lower input current. Match the drive current and the bandwidth to the job.
  • Where it sits matters: these parts live between a controller and a power stage, and their specified common-mode immunity (the HCPL-2601/2611 grades) is the difference between a clean drive and a phantom fault in welder and servo environments.
Frequently Asked Technical Questions

Q: Can a 6N136 replace a 6N137?

A: Same 8-pin body, different species: the 6N136 is a 1 megabit phototransistor part with no VCC and no enable, and its pins 5, 6 and 7 are Emitter, Collector and Base where the 6N137 has GND, Output and Enable. The LED side matches; nothing else should be assumed.

Q: Why is my 6N137 output always high?

A: Two candidates: the enable pin (7) is floating or tied low, which disables the output to a permanent high, or the open-collector output is missing its pull-up resistor. Both are wiring facts, not part failures.

Q: What is the difference between the 6N137 and the HCPL-2601?

A: The same 10 megabit logic-gate function and pinout; the HCPL-2601 adds a specified improved noise shield (guaranteed common-mode immunity where the 6N137 relies on typicals), and the HCPL-2611 raises that guarantee further - the motor-drive grade of the same socket.

Technical details

5 kVrms galvanic isolation for industrial signal paths

The 6N139M from onsemi is a single-channel Darlington-output optocoupler rated for 5000Vrms isolation — the spec that matters for breaking ground loops between a 24 V PLC input module and the backplane logic. The 8-DIP through-hole package (0.300-inch body width) mates with standard DIP sockets or solders directly into plated-through holes, common on industrial I/O cards and motor-drive control boards. The Darlington output with a separate base pin allows the designer to add an external pull-down resistor to adjust the switching threshold or to disable the output during power-up sequencing.

CTR floor and timing for the BOM trade-off

Minimum current transfer ratio of 500% at 1.6 mA forward current means the output can sink 60 mA while the LED is driven by less than 2 mA from a 3.3V or 5V logic pin — no external transistor needed. Turn-on time is 240 ns typical, turn-off is 1.3 µs. The asymmetry is inherent to the Darlington output — the base storage delay dominates the turn-off. For a PLC input sampling at 1 kHz or a relay coil driver, that 1.3 µs off-time is invisible. For a PWM signal above a few kHz, the duty-cycle distortion from the asymmetry needs a budget check.

Active production, ROHS3, and sourcing posture

Surface-mount siblings (6N139SVM, 6N139SDM) share the same die and isolation rating but come in SMD wide-body packages. Quoted to order against BOM quantity. The tube quantity is typically 50 per tube for this package; factor that into the pick-and-place or hand-assembly yield if ordering partial tubes.

Package and footprint fit for through-hole assembly

8-DIP (0.300-inch, 7.62 mm row spacing) — the standard 0.100-inch pitch DIP footprint. The 8-DIP supplier device package is the same body as the 6N139 in the same tube. The base pin (pin 6 on the Darlington) is left open or pulled to ground; it is not a no-connect. If the layout already uses a 6N138 socket, check the pinout — the 6N139 base pin replaces the 6N138's separate photodiode and transistor output, so the external resistor network changes.

6N139M
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