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SMD code N18 in SOT-89

Marking codes are not standardised, and the same code is reused by unrelated makers for unrelated parts. Below is every part in our tables printed with it, and any printed with a code that is easy to misread as it, from the manufacturers' own marking tables and published code lists.

3 parts in SOT-89 are printed N18

Not sure which one you have?

Answer up to 4 quick questions and these 4 parts are ranked, with a meter test that settles it. It works on a dead part too.

  • BL8064CC3TR18SOT-89LDO regulator, Shanghai BellingLDO regulatorShanghai Belling
    What it is
    LDO regulator
    Maker
    Shanghai Belling
    Package
    SOT-89
    Pins
    3
    Details
    Linear voltage regulator IC: LDO, 1.8V±2%, 250mA
    Source
    Published code list

    Is it dead? The meter test is below: Voltage regulator.

  • LC1208CC3TR18SOT-89LDO regulator, Shanghai LeadChip MicroelectronicsLDO regulatorShanghai LeadChip Microelectronics
    What it is
    LDO regulator
    Maker
    Shanghai LeadChip Microelectronics
    Package
    SOT-89
    Pins
    3
    Details
    Linear voltage regulator IC: LDO, 1.8V±2%, 250mA
    Source
    Published code list

    Is it dead? The meter test is below: Voltage regulator.

  • LR8064CC3TR18SOT-89LDO regulator, LRCLDO regulatorLRC
    What it is
    LDO regulator
    Maker
    LRC
    Package
    SOT-89
    Pins
    3
    Details
    Linear voltage regulator IC: LDO, 1.8V±2%, 250mA
    Source
    Published code list

    Is it dead? The meter test is below: Voltage regulator.

  • 1 more part has no package on record. Nothing rules it out, so it stays.
    • LDTC113YET1GDigital transistor (NPN, resistors built in), LRCDigital transistor (NPN, resistors built in)LRC
      What it is
      Digital transistor (NPN, resistors built in)
      Maker
      LRC
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Digital transistor (bias resistors built in), NPN, IC 100 mA, VCEO 50 V
      Source
      An older or alternative marking, from a published code list

      Is it dead? The meter test is below: Digital transistor.

      Datasheetfor LDTC113YET1G, opens in a new tab

Is it dead? One meter test per kind

Parts of the same kind are tested the same way, so each test is here once. Each part above points to its own.

Voltage regulator

Voltage, board powered, black probe on ground. Then ohms with the power off.

Working, it reads

Input pin at the supply, output pin at its rated voltage, and the enable pin high if it has one.

Dead, it reads

  • Output equal to the input: the pass element has shorted. Everything after it may have taken the full input.
  • Input present, enable high, no output: failed open, or holding itself off into a shorted load. Power off and measure output to ground.
  • Power off, input to output near 0 Ω: shorted.
On the board:
An output at 0 V is often a shorted load with the regulator in current limit. Lift the output pin: if the short stays on the board, the regulator may be fine.
Compare:
The same regulator on another rail or another board shows the right voltages and the right resistances.
Watch for:
Makers put input, output and ground on different pins in the same package, so take them from this part's datasheet. Diode or ohms readings between its pins say little; check it powered.

A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

Digital transistor

Ohms range, part lifted. The datasheet gives the built-in resistors: R1 in series with the base, R2 from base to emitter.

Working, it reads

Base to emitter reads about R1 plus R2 either way round, about 20 kΩ on a 10 k and 10 k part, give or take their wide tolerance. Collector to emitter reads open. A part with no R2 reads a junction behind R1 one way instead.

Dead, it reads

  • Collector to emitter the same both ways, near 0 Ω with a continuous beep: shorted.
  • From the base, open or far above R1 plus R2: R1 has failed. Static damage shows here most often.
  • Base to emitter near 0 Ω: failed short.
On the board
this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
Compare:
The readings depend on the resistor values, so an identical part elsewhere on the board is the surest reference. Measure it the same way.
Watch for:
On the diode range a good part with 10 kΩ resistors reads open on every pair, so a good part looks dead there. Use the ohms range.

A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

Printed with a code easy to misread as N18

One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.

Codes that begin with N18

For a marking with its end worn or burnt off. Each code has a page of its own.

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