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onsemi 6N137 — Optoisolators
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onsemi / Optoisolators

6N137 Optoisolator – onsemi, 10 Mbps, Open Collector, 8-DIP

MPN 6N137
Obsolete Spot Stock · 24-48h Dispatch 100% Original Sealed

onsemi 6N137, single-channel optoisolator, 10 Mbps data rate, open collector output, 2500 Vrms isolation, 8-DIP through-hole package

In Stock: 22,318 pcs
MOQ: 1 pcs
Logistics: DHL / FedEx DAP (Global Express · 3-7d) Russia & CIS DDP (Door-to-Door Cleared)
Dispatch: Shenzhen / HK
Unit Price (USD)
$0.34 / pc
Direct Purchase Ready
Volume Pricing Breaks Confirmed upon quotation
1+ pcs
$0.34
10+ pcs
$0.26
45+ pcs
$0.21
90+ pcs
$0.18
495+ pcs
$0.17
990+ pcs
$0.17
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$0.34 / ea

22,318 in stock — maximum per order · 3–4 days lead time

$0.26 / ea from 10 pcs
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100% Original Sealed 45x Microscope QC 30-Day Warranty · COC USD T/T & PI · DAP/DDP
[SPEC] Essential Parameters Snapshot Full Specifications (17)
Package / Case 8-DIP (0.300", 7.62mm)
Supply Voltage 4.5V ~ 5.5V
Output / Current 50 mA
ALT
Facing long factory lead times or allocation on 6N137? Verified pin-compatible alternatives available with active Shenzhen stock and 100% solder-ready footprint match.
View Pin Alternates (3)

Full Technical Specifications

17 Parameters
6N137 specifications
Parameter / AttributeSpecification / Value
Input typeDC
Output typeOpen Collector
MountingThrough Hole
Supply voltage4.5V ~ 5.5V
Voltage - isolation2500Vrms
Voltage - forward (Vf)1.4V
Current - output (Channel)50 mA
Current - DC forward (If)50mA
Operating temperature-40°C~85°C
PackageTube
Data rate10Mbps
Case8-DIP (0.300\", 7.62mm)
Channels1
Inputs - side 1/Side 21/0
Rise (Fall time)50ns, 12ns
Propagation delay tpLH (tpHL)75ns, 75ns
Common mode transient immunity10kV/µs (Typ)
100% Footprint Match · Solder-Ready (No PCB Redesign Needed)

Need Stock or a Drop-in Second-Source for 6N137?

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 6N137 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 6N137 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 6N137 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 & Description

The 6N137: It is RoHS non-compliant, so it cannot be used in new designs requiring lead-free solder. For existing boards in repair or legacy production, we can source remaining inventory through our supply network — submit an RFQ with your target quantity and date code preference.

10 Mbps open-collector digital isolator

The 6N137 is a single-channel optoisolator with a 10 Mbps data rate and an open-collector output. The 2500 Vrms isolation rating provides a basic safety barrier between logic domains.

Through-hole 8-DIP package and supply range

The input LED requires a forward voltage of 1.4 V typical and a forward current up to 50 mA. The output can sink 50 mA per channel.

Frequently asked questions

Can I get current pricing and availability for 6N137?

Since the 6N137 is obsolete, we do not carry it available via RFQ confirmation. Submit an RFQ with your quantity and target date code; we will source from our independent supply network and return a quote with lead time.

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