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onsemi H11A1TVM — Optoisolators
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RoHS Compliant · Lead-Free EIA-481 Standard
onsemi / Optoisolators

H11A1TVM onsemi Optoisolator – 4170Vrms, 6-DIP, Active

MPN H11A1TVM
Active Spot Stock · 24-48h Dispatch 100% Original Sealed

onsemi H11A1TVM, single-channel DC-input phototransistor optoisolator with base access, 4170Vrms isolation, 50% CTR at 10mA, 2µs typ switching, -40°C to 100°C, through-hole 6-DIP (0.400-inch body).

In Stock: 4 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)
$1.30 / pc
Direct Purchase Ready
Volume Pricing Breaks Confirmed upon quotation
1+ pcs
$1.30
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$1.30 / ea

4 in stock — maximum per order · 3–4 days lead time
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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 (14)
Package / Case 6-DIP (0.400", 10.16mm)
ALT
Facing long factory lead times or allocation on H11A1TVM? Verified pin-compatible alternatives available with active Shenzhen stock and 100% solder-ready footprint match.
View Pin Alternates (4)

Full Technical Specifications

14 Parameters
H11A1TVM specifications
Parameter / AttributeSpecification / Value
Input typeDC
Output typeTransistor with Base
MountingThrough Hole
Voltage - isolation4170Vrms
Voltage - output30V
Voltage - forward (Vf)1.18V
Current transfer ratio50% @ 10mA
Current - DC forward (If)60 mA
Operating temperature-40°C ~ 100°C
PackageTube
Case6-DIP (0.400\", 10.16mm)
Channels1
Vce saturation400mV
Turn on (Turn off time)2µs, 2µs
100% Footprint Match · Solder-Ready (No PCB Redesign Needed)

Need Stock or a Drop-in Second-Source for H11A1TVM?

Package: DIP-6 · Pin-compatible replacements with immediate Shenzhen spot stock

Footprint Match 98%
Supply Chain & Allocation Reality:

The 4N2x / 4N3x row is the general-purpose opto that predates the PC817 and still fills industrial boards, instruments and old audio gear: a 6-pin DIP with an infrared LED, a phototransistor, and one extra pin the 4-pin generation gave up - the base of the phototransistor, brought out for speed-up tricks and threshold trimming. The family is a CTR ladder wearing four part numbers: 4N25/26 at 20% minimum, 4N27/28 at 10%, and the 4N35/36/37 trio at 100% - one of the highest CTRs of any general-purpose opto, which is why it survives in circuits that need gain more than speed. Substituting within the row is honest work; substituting against the 4-pin PC817 row is the classic socket error.

Verified Pin-Compatible Replacements (4 verified alternatives)

4N25 onsemi / Vishay / Everlight DIP-6
100% Drop-in (Zero Code Change)
Availability & Target Pricing:

The 20% Rung - Same Socket, Real Numbers

Shenzhen Spot Stock (24-48h Dispatch)

Electrical & Core Specs:

The 20% minimum CTR member at 10mA LED current (same bin as the 4N26): the everyday grade of the row, pin-identical to every 4N2x and 4N3x part.

Standard 6-pin opto envelope: 5.3kV-class isolation in the classic parts, 30V-class collector-emitter ratings, pin 6 base exposed.

Compatibility & Drop-In Notes: Substitution inside the row must carry the CTR requirement: a 4N25 (20%) is a genuine downgrade from a 4N35 (100%) in any circuit that relied on the gain - the LED drive may need recomputing. The reverse is free margin.
Package & Solder Footprint: Standard 6-pin DIP; pinout 1 anode, 2 cathode, 3 NC, 4 emitter, 5 collector, 6 base.
Shenzhen Warehouse Stock & MOQ: Stocked across the row; the differences are documented per grade.
Request Volume Quote for 4N25 Compare H11A1TVM vs 4N25 Spec Matrix
4N37 Everlight / Vishay / onsemi DIP-6
100% Drop-in (Zero Code Change)
Availability & Target Pricing:

The 100% CTR Rung

Shenzhen Spot Stock (24-48h Dispatch)

Electrical & Core Specs:

The high-gain member of the row: 100% minimum CTR at 10mA (40% guaranteed across the full temperature range), the reason it appears wherever the driving current must stay small.

Same envelope; isolation figure per the vendor grade (5.3kV class in the classic datasheets).

Compatibility & Drop-In Notes: The honest substitution sentence for this row: going up in CTR is always electrically kind; going down needs the drive budget re-derived - the 10mA figure in the datasheet assumes the LED the original design budgets for.
Package & Solder Footprint: Identical 6-pin DIP footprint.
Shenzhen Warehouse Stock & MOQ: Stocked as the high-gain repair part for marginal-drive circuits.
Request Volume Quote for 4N37 Compare H11A1TVM vs 4N37 Spec Matrix
H11A1 Vishay / onsemi (legacy) DIP-6
Functional Equivalent
Availability & Target Pricing:

The Ancestor Row

Shenzhen Spot Stock (24-48h Dispatch)

Electrical & Core Specs:

The 6-pin row the 4N parts were defined alongside: H11A1 at 50% minimum CTR, H11A5 at 30% - same socket and base pin, its own gain ladder.

Same envelope and isolation class.

Compatibility & Drop-In Notes: In equipment documentation, a service manual often names the H11A part while the board carries a 4N one (or the reverse): the numbers are what matter, the names are lineage.
Package & Solder Footprint: Standard 6-pin DIP pinout.
Shenzhen Warehouse Stock & MOQ: Stocked for legacy equipment; verify markings on older lots.
Request Volume Quote for H11A1 Compare H11A1TVM vs H11A1 Spec Matrix
PC817 Sharp / multiple DIP-4
Functional Equivalent
Availability & Target Pricing:

The 4-Pin Cousin - Different Socket

Shenzhen Spot Stock (24-48h Dispatch)

Electrical & Core Specs:

The 4-pin general-purpose opto of the next generation: same phototransistor idea without the base pin, and its own CTR rank system (A/B/C/D) that replaced the 4N CTR ladder in new designs.

Same functional envelope; 5kV-class isolation in the modern parts.

Compatibility & Drop-In Notes: When a service note says "PC817 replaces 4N35", it means functionally in some circuits - the socket does not agree. Fitting a 4-pin part into a 6-pin footprint needs the adapter or a new layout, and the base-pin behavior is gone either way.
Package & Solder Footprint: DIP-4 against DIP-6: different footprint by construction.
Shenzhen Warehouse Stock & MOQ: The modern volume part; see its own page for the rank system.
Request Volume Quote for PC817 Compare H11A1TVM vs PC817 Spec Matrix
Buyer & Quality Checklist for Sourcing Alternatives
  • The CTR minimum is the specification: 4N25/4N26 = 20%, 4N27/4N28 = 10%, 4N35/4N36/4N37 = 100% (40% across the extended range). The 4N3x trio is the same sockets at five times the gain - the direction of every substitution follows this number.
  • Pin 6 (base) distinguishes this row from the 4-pin generation: a base-emitter resistor speeds the transistor up (trading gain for bandwidth), and a small bias trims the threshold. Designs that used it detect a replacement without it immediately - noise and edge behavior change.
  • The 4-pin PC817 row is not the same socket: no base pin, a different rank system (A-D), and a modern isolation class. Functionally comparable in many circuits, mechanically incompatible without an adapter.
  • LED drive is part of the gain budget: the CTR numbers assume 10mA of LED current. A circuit that halved its LED drive for efficiency cannot expect the original switching thresholds from the same grade.
  • The classic 6-pin bodies carry 5.3kV-class isolation figures - verify per vendor and grade; clone rows trade here first.
  • For repair of old gear, read the service manual part against the row: the H11A names and the 4N names cross freely in tables, and the CTR number is the only thing that transfers between them.
Frequently Asked Technical Questions

Q: What is the difference between 4N25 and 4N35?

A: Current transfer ratio: 4N25 is 20% minimum, 4N35 is 100% minimum (40% guaranteed over the extended temperature range). Same 6-pin socket and pinout; the 4N3x part is the high-gain version of the same design.

Q: What is pin 6 on a 4N35 used for?

A: The phototransistor base, brought out for design freedom: a base-emitter resistor speeds up switching, a small bias trims the effective threshold. It is also the physical difference from the 4-pin opto generation.

Q: Can I replace a 4N35 with a PC817?

A: Functionally similar in many circuits, but not socket-compatible - the PC817 is a 4-pin part without the base pin. Fitting one needs an adapter or a new layout, and the base-pin behavior is lost either way.

Technical Details & Description

Single-channel phototransistor isolator with base access

The H11A1TVM is a single-channel optoisolator from onsemi that couples a DC-input LED to a phototransistor output with an exposed base terminal. The base pin gives the designer the option to add a speed-up resistor or a base-emitter shunt for improved noise immunity — a feature missing from simpler three-pin optocouplers. Rated for 4170Vrms isolation between input and output, it suits galvanic isolation in AC mains sensing, relay drivers, and PLC digital input modules where the safety barrier must withstand 250VAC or 400VDC working voltage with margin.

With a minimum current transfer ratio of 50% at 10mA forward current, the H11A1TVM guarantees that 10mA into the LED will pull the output transistor into saturation for a collector load up to 5mA. If the output load draws 10mA, the LED must be driven with at least 20mA — well within the 60mA absolute-maximum forward current rating. Typical turn-on and turn-off times are both 2µs, which is adequate for 50/60Hz line-frequency switching, zero-cross detection, and slow digital signals up to a few kilohertz. For applications needing faster data rates — above 10kHz — a logic-output optocoupler with a photodiode detector would be a better fit.

Package and temperature grade — through-hole legacy, industrial range

The H11A1TVM is supplied in a through-hole 6-DIP package with a 0.400-inch (10.16mm) body width. The 100°C upper limit is the junction temperature — derate the LED forward current above 70°C ambient to stay within the safe operating area. onsemi lists the H11A1TVM as Active in production. It is ROHS3 compliant. No end-of-life notice or successor part has been published.

Frequently asked questions

Can H11A1TVM replace H11A1?

The H11A1TVM shares the same base product number (H11A1) and electrical ratings — 4170Vrms isolation, 50% CTR min, 2µs switching, same 6-DIP footprint. The 'TVM' suffix indicates a specific onsemi packaging code (tube) and RoHS compliance. Functionally it is a direct replacement for any standard H11A1 in a through-hole DIP package, provided the BOM calls for the same body width (0.400-inch).

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