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onsemi 4N28300 — Optoisolators

onsemi 4N28300 Optoisolator, 5300Vrms, 6-DIP, Obsolete

MPN4N28300
Obsolete

onsemi 4N28300 optoisolator, 1-channel DC input, transistor with base output, 5300Vrms isolation, 6-DIP (0.300", 7.62mm) through hole, tube.

$0.1167Ref. price · indicative, final on quote
onsemi 4N28300 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

4N28300 specifications
ParameterValue
Input typeDC
Output typeTransistor with Base
MountingThrough Hole
Voltage - isolation5300Vrms
Voltage - output30V
Voltage - forward (Vf)1.18V
Current transfer ratio10% @ 10mA
Current - DC forward (If)100 mA
Operating temperature-55°C ~ 100°C
PackageTube
Case6-DIP (0.300\", 7.62mm)
Channels1
Vce saturation500mV
Turn on (Turn off time)2µs, 2µs

Product details

The 4N28300 is listed as obsolete by onsemi. Quantities are lot-specific; availability and pricing confirmed at RFQ. No pin-compatible drop-in replacement from onsemi is documented.

5300Vrms isolation, 10% CTR at 10 mA

Rated for 5300Vrms isolation — this is the galvanic barrier rating for basic or reinforced insulation in a 6-DIP package. The 10% minimum current transfer ratio at 10 mA forward current means the output transistor saturates reliably when the LED is driven at that level. Typical turn-on and turn-off times are 2 µs each, which suits medium-speed digital isolation or feedback in a switched-mode supply — the 30V Vce(max) output accommodates common control rails. The 1.18V typical forward voltage at 10 mA is standard for a GaAs IR LED.

6-DIP through-hole package

Housed in a 6-DIP (0.300", 7.62mm) through-hole package with a 500mV max Vce saturation. The tube packaging is standard for DIP optoisolators — the 7.62mm body width is the common DIP-6 footprint.

Frequently asked questions

What is the closest pin-compatible alternative to 4N28300?

No official pin-compatible successor from onsemi is documented. The 4N28 family (base product number 4N28) shares the same 6-DIP footprint and pinout, but individual CTR and isolation grades vary. A cross-reference search against the 4N28 family may yield a functional equivalent, but no drop-in replacement is guaranteed.

How do I get current pricing and availability for 4N28300?

Submit a request for the quantity needed; pricing and lot-specific availability are confirmed at quote time.

What is the input type and output configuration of 4N28300?

DC input on the LED side; transistor output with base access on the detector side. The base pin allows external bias adjustment or feedback compensation.