SMD marking
19D
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.
19D on a chip resistor
154 kΩ
154 kΩ resistor, 1%
EIA-96 precision code: 19 selects 1.54 from the E96 series and D multiplies by 100000. These are 1% parts.
Check it with a meter
Lift one end and measure across it. A good one reads 154 kΩ within 1%. Measuring it in circuit reads the parallel combination of everything around it, which is almost always lower, never higher: well above 154 kΩ on the board is a fault. Open, or well above 154 kΩ, means it has failed: burnt, cracked or corroded. That does not change what to fit: the marking still says 154 kΩ. A burnt resistor usually means the part it feeds drew too much, so find that before fitting a new one.
On a transistor or diode body (SOT-353), 19D is a part code instead. Those parts are listed below.
Not sure which one you have?
Answer up to 4 quick questions and these 2 parts are ranked, with a meter test that settles it. It works on a dead part too.
The only part printed 19D in our tables
TLV62569DRL
- What it is
- DC-DC converter
- Maker
- Texas Instruments
- Package
- Not recorded
- Pins
- 6
- Details
- 2-A High Efficiency Synchronous Buck Converter in SOT Package
- Source
- From the manufacturer's datasheet
Is it dead?
Voltage with the board powered; ohms from each pin to ground with it off.
Working, it reads
Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.
Dead, it reads
- A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
- Supply present, output stuck: failed, or its load has.
- On the board:
- A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
- Compare:
- The surest reference is the same IC on a working board, measured pin by pin.
- Watch for:
- Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.
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
This part is printed with a character that is easy to misread as what you typed. The odd one out is marked on each.
TLV7021DCKprinted 19OSOT-353Comparator, 5 pins, Texas InstrumentsComparatorSOT-3535 pinsTexas Instruments
Printed 19O on the part. Easy to misread as 19D. Check that character with a loupe before you order anything.
- What it is
- Comparator
- Maker
- Texas Instruments
- Package
- SOT-353
- Pins
- 5
- Details
- Small-Size, Low-Power, Low-Voltage Comparators
- Source
- From the manufacturer's datasheet
Is it dead?
Voltage with the board powered; ohms from each pin to ground with it off.
Working, it reads
Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.
Dead, it reads
- A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
- Supply present, output stuck: failed, or its load has.
- On the board:
- A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
- Compare:
- The surest reference is the same IC on a working board, measured pin by pin.
- Watch for:
- Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Open this in the search to correct a character or try another package.