SMD code 3Db
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.
The last letter, b, is lower case, which on NXP and Philips parts is a date or factory code, so it was set aside and 3D was searched.
115 parts are printed 3Db
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.
NSVMMBTH81LSOT-23PNP transistor, 3 pins, onsemiPNP transistorSOT-233 pinsonsemi
- What it is
- PNP transistor
- Maker
- onsemi
- Package
- SOT-23
- Pins
- 3
- Details
- PNP RF Transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: PNP transistor.
RB715FSOT-323Schottky diode, 3 pins, Galaxy MicroelectronicsSchottky diodeSOT-3233 pinsGalaxy Microelectronics
- What it is
- Schottky diode
- Maker
- Galaxy Microelectronics
- Package
- SOT-323
- Pins
- 3
- Details
- 0.03A, 40V, Surface Mount Small Signal Schottky Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
RB715FFHSOT-323Schottky diode, 3 pins, ROHMSchottky diodeSOT-3233 pinsROHM
- What it is
- Schottky diode
- Maker
- ROHM
- Package
- SOT-323
- Pins
- 3
- Details
- Schottky Barrier Diode (AEC-Q101 qualified)
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
RB715WSOT-416Schottky diode, 3 pins, ROHMSchottky diodeSOT-4163 pinsROHM
- What it is
- Schottky diode
- Maker
- ROHM
- Package
- SOT-416
- Pins
- 3
- Details
- 0.03A, 40V, Surface Mount Small Signal Schottky Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
RB715WFHSOT-416Schottky diode, 3 pins, ROHMSchottky diodeSOT-4163 pinsROHM
- What it is
- Schottky diode
- Maker
- ROHM
- Package
- SOT-416
- Pins
- 3
- Details
- Schottky Barrier Diode (AEC-Q101 qualified)
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
RB715ZMSOT-723Schottky diode, 3 pins, ROHMSchottky diodeSOT-7233 pinsROHM
- What it is
- Schottky diode
- Maker
- ROHM
- Package
- SOT-723
- Pins
- 3
- Details
- Schottky Barrier Diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
S-LMBTA44LT1GSOT-23NPN transistor, 3 pins, LRCNPN transistorSOT-233 pinsLRC
- What it is
- NPN transistor
- Maker
- LRC
- Package
- SOT-23
- Pins
- 3
- Details
- Bipolar transistor, NPN, IC 200 mA, VCEO 400 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
S-LMBTA44LT1G-SSOT-23NPN transistor, 3 pins, LRCNPN transistorSOT-233 pinsLRC
- What it is
- NPN transistor
- Maker
- LRC
- Package
- SOT-23
- Pins
- 3
- Details
- Bipolar transistor, NPN, IC 200 mA, VCEO 400 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
S-LRB715FT1GSOT-323Schottky diode, 3 pins, LRCSchottky diodeSOT-3233 pinsLRC
- What it is
- Schottky diode
- Maker
- LRC
- Package
- SOT-323
- Pins
- 3
- Details
- Schottky diode, VR 40 V, IF 0.03 A, VF Max 0.37 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
SCS715FSOT-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.
SCS715TSOT-523Schottky diode, 3 pins, SeCoSSchottky diodeSOT-5233 pinsSeCoS
- What it is
- Schottky diode
- Maker
- SeCoS
- Package
- SOT-523
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
4 more parts have no package on record
NSR2030DMXSchottky diode, onsemiSchottky diodeNot recordedNot recordedonsemi
- What it is
- Schottky diode
- Maker
- onsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- 2A, 30V Schottky Half Bridge
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
PG03HSUL2ESD protection diode, KECESD protection diodeNot recordedNot recordedKEC
- What it is
- ESD protection diode
- Maker
- KEC
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
S-LRB715WT1GSchottky diode, LRCSchottky diodeNot recordedNot recordedLRC
- What it is
- Schottky diode
- Maker
- LRC
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Schottky diode, VR 40 V, IF 0.03 A, VF Max 0.37 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
SE03N2S01GZTVS diode, SOCAYTVS diodeNot recordedNot recordedSOCAY
- What it is
- TVS diode
- Maker
- SOCAY
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
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.
PNP transistor
Diode range, part lifted or its base leg off the pad.
Working, it reads
Black probe on the base reads about 0.6 to 0.75 V to the emitter and to the collector, and open the other way round. Collector to emitter reads open both ways.
Dead, it reads
- Collector to emitter the same both ways, near 0 V with a continuous beep: shorted. The commonest failure.
- The base the same both ways to another pin, near 0 V or a middling value: a shorted junction.
- Only one junction reads, or none: a junction has failed open. It then looks like a diode.
- A reading the wrong way round, where it should be open: leaky.
- 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 pair of diodes with a common pin reads just like a transistor, and some transistors carry a built-in diode or resistor. The datasheet says which.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
TVS or ESD protection diode
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
- From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
- A reading both ways on a one-way part: leaky.
- A one-way part open both ways: failed open.
- On the board
- , a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
- Compare:
- The same part on the next line or connector pin is the healthy reading to compare with.
- Watch for:
- A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
NPN transistor
Diode range, part lifted or its base leg off the pad.
Working, it reads
Red probe on the base reads about 0.6 to 0.75 V to the emitter and to the collector, and open the other way round. Collector to emitter reads open both ways.
Dead, it reads
- Collector to emitter the same both ways, near 0 V with a continuous beep: shorted. The commonest failure.
- The base the same both ways to another pin, near 0 V or a middling value: a shorted junction.
- Only one junction reads, or none: a junction has failed open. It then looks like a diode.
- A reading the wrong way round, where it should be open: leaky.
- 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 pair of diodes with a common pin reads just like a transistor, and some transistors carry a built-in diode or resistor. The datasheet says which.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
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