SMD code 44-
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.
77 parts are printed 44-
Not sure which one you have?
Answer up to 4 quick questions and these 50 parts are ranked, with a meter test that settles it. It works on a dead part too.
ABAS40-04-HFSOT-23Schottky diode, 3 pins, ComchipSchottky diodeSOT-233 pinsComchip
- What it is
- Schottky diode
- Maker
- Comchip
- Package
- SOT-23
- Pins
- 3
- Details
- 40 V, 0.12 A Schottky barrier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
ABAS40WT-04-HFSOT-323Schottky diode, 3 pins, ComchipSchottky diodeSOT-3233 pinsComchip
- What it is
- Schottky diode
- Maker
- Comchip
- Package
- SOT-323
- Pins
- 3
- Details
- 40 V, 0.12 A Schottky barrier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
BAS40-04SOT-23Schottky diode, 3 pins, InfineonSchottky diodeSOT-233 pinsInfineon
- What it is
- Schottky diode
- Maker
- Infineon
- Package
- SOT-23
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
BAS40-04-CSOT-23Schottky diode, 3 pins, SeCoSSchottky diodeSOT-233 pinsSeCoS
- What it is
- Schottky diode
- Maker
- SeCoS
- Package
- SOT-23
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
BAS40-04-HFSOT-23Schottky diode, 3 pins, ComchipSchottky diodeSOT-233 pinsComchip
- What it is
- Schottky diode
- Maker
- Comchip
- Package
- SOT-23
- Pins
- 3
- Details
- 40 V, 0.2 A Schottky barrier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
BAS40-04-P2-HFSOT-23Schottky diode, 3 pins, ComchipSchottky diodeSOT-233 pinsComchip
- What it is
- Schottky diode
- Maker
- Comchip
- Package
- SOT-23
- Pins
- 3
- Details
- 40 V, 0.2 A Schottky barrier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
BAS40-04TSOT-523Schottky diode, 3 pins, Galaxy MicroelectronicsSchottky diodeSOT-5233 pinsGalaxy Microelectronics
- What it is
- Schottky diode
- Maker
- Galaxy Microelectronics
- Package
- SOT-523
- Pins
- 3
- Details
- 0.2A, 40V, Surface Mount Small Signal Schottky Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
BAS40-04W-CSOT-323Schottky diode, 3 pins, SeCoSSchottky diodeSOT-3233 pinsSeCoS
- What it is
- Schottky diode
- Maker
- SeCoS
- Package
- SOT-323
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
BAS40W-04SOT-323Schottky diode, 3 pins, Formosa MicrosemiSchottky diodeSOT-3233 pinsFormosa Microsemi
- What it is
- Schottky diode
- Maker
- Formosa Microsemi
- Package
- SOT-323
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
BAS40W-04-P2-HFSOT-323Schottky diode, 3 pins, ComchipSchottky diodeSOT-3233 pinsComchip
- What it is
- Schottky diode
- Maker
- Comchip
- Package
- SOT-323
- Pins
- 3
- Details
- 40 V, 0.2 A Schottky barrier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
BAT54SWSOT-323Schottky diode, 3 pins, NexperiaSchottky diodeSOT-3233 pinsNexperia
- What it is
- Schottky diode
- Maker
- Nexperia
- Package
- SOT-323
- Pins
- 3
- Pinout
- 1 anode of diode 1
- 2 cathode of diode 2
- 3 cathode of diode 1 and anode of diode 2
- Details
- 30 V surface-mount Schottky barrier diode, dual series
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
CDBT-40S-HFSOT-23Schottky diode, 3 pins, ComchipSchottky diodeSOT-233 pinsComchip
- What it is
- Schottky diode
- Maker
- Comchip
- Package
- SOT-23
- Pins
- 3
- Details
- 40 V, 0.2 A Schottky barrier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
DTC014YEBSOT-416Digital transistor (NPN, resistors built in), 3 pins, ROHMDigital transistor (NPN, resistors built in)SOT-4163 pinsROHM
- What it is
- Digital transistor (NPN, resistors built in)
- Maker
- ROHM
- Package
- SOT-416
- Pins
- 3
- Details
- NPN 100mA 50V Digital Transistor (Bias Resistor Built-in Transistor)
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Digital transistor.
2 more parts have no package on record
BB664InfineonNot recordedNot recordedNot recordedInfineon
- What it is
- Not recorded
- Maker
- Infineon
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: This part.
BFCN-7500+RF filter, Mini-CircuitsRF filterNot recordedNot recordedMini-Circuits
- What it is
- RF filter
- Maker
- Mini-Circuits
- Package
- Not recorded
- Pins
- Not recorded
- Details
- LTCC filter, 7450-7650 MHz
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: This part.
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.
Schottky diode
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.15 to 0.45 V anode to cathode, roughly half a silicon diode, and open the other way.
Dead, it reads
- The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
- A reading the wrong way round as well: leaky.
- Open both ways: failed open.
- 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:
- If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
- Watch for:
- A large Schottky can read about 0.1 V forward and beep like a short, and leaks a little the wrong way when good, more when warm. It is shorted only if it reads the same both ways. Measure it cold, beside an identical cold one.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
This part
Diode range and ohms range, part lifted.
Working, it reads
Depends on what it is. The datasheet, or an identical part, says.
Dead, it reads
- Between two pins, the same reading both ways, near 0 V with a continuous beep: shorted.
- Open between every pair of pins: failed open, or a part that reads open when working.
- 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:
- If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
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 44-
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 44-
For a marking with its end worn or burnt off. Each code has a page of its own.
- 440A25
- 440C22
- 44010
- 4402G1
- 4405E1
- 44101
- 44181
- 44191
- 44353
- 44552
- 44901
- 44921
- 4409AGEM1
- 4415GH1
- 4438GYT1
- 4453GYT1
- 44594
- 44632
- 44G13
- 44B28
- 4459A2
- 44A28
- 44F16
- 44S5
- 44S11
- 44T9
- 4497
- 4436
- 4467
Codes not listed here are printed on 406 more parts.
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