SMD code R27
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.
R27 on a chip resistor
0.27 Ω
0.27 Ω resistor
The R stands in for the decimal point, which is how sub-ohm and fractional values are printed. The same marking also reads as 0.27 µH on an inductor or 0.27 pF on a capacitor, and nothing in the code says which; the body of the part does.
Other readings of the same characters, most likely first
- 0.27 µH inductor
- 0.27 pF capacitor
Check it with a meter
Lift one end and measure across it. A good one reads 0.27 Ω. Measuring it in circuit reads the parallel combination of everything around it, which is almost always lower, never higher: well above 0.27 Ω on the board is a fault. Open, or well above 0.27 Ω, means it has failed: burnt, cracked or corroded. That does not change what to fit: the marking still says 0.27 Ω. 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-23, SOT-23-5, SOT-89), R27 is a part code instead. Those parts are listed below.
27 parts are printed R27
Not sure which one you have?
Answer up to 4 quick questions and these 27 parts are ranked, with a meter test that settles it. It works on a dead part too.
2SC4093-27SOT-1434 pins, RenesasNot recordedSOT-1434 pinsRenesas
- What it is
- Not recorded
- Maker
- Renesas
- Package
- SOT-143
- Pins
- 4
- Details
- Si-npn: VHF/UHF, CATV, 20V, 100mA, 200mW, B=80..160, 7GHz
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SC4093RSOT-1434 pins, RenesasNot recordedSOT-1434 pinsRenesas
- What it is
- Not recorded
- Maker
- Renesas
- Package
- SOT-143
- Pins
- 4
- Details
- npn RF fT 6.5 GHz hfe 80-160
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SC4093RB-GSOT-1434 pins, NEC ElectronicsNot recordedSOT-1434 pinsNEC Electronics
- What it is
- Not recorded
- Maker
- NEC Electronics
- Package
- SOT-143
- Pins
- 4
- Details
- Si-npn: VHF/UHF, CATV, 20V, 100mA, 200mW, B=80..160, 7GHz
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SC5011-FBSOT-1434 pins, NEC ElectronicsNot recordedSOT-1434 pinsNEC Electronics
- What it is
- Not recorded
- Maker
- NEC Electronics
- Package
- SOT-143
- Pins
- 4
- Details
- Si-npn: UHF, LN, 20V, 100mA, 150mW, B=80..160, 6,5Hz
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SC5011RSOT-3434 pins, RenesasNot recordedSOT-3434 pinsRenesas
- What it is
- Not recorded
- Maker
- Renesas
- Package
- SOT-343
- Pins
- 4
- Details
- npn RF fT 6.5 GHz hfe 80-160
- Source
- Published code list
Is it dead? The meter test is below: This part.
AD1584SOT-233 pins, Analog DevicesNot recordedSOT-233 pinsAnalog Devices
- What it is
- Not recorded
- Maker
- Analog Devices
- Package
- SOT-23
- Pins
- 3
- Details
- 4.096 V Precision Series Mode Voltage Reference
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
CM7R250-27B-TSOT-23LDO regulator, 3 pins, Canaan MicroelectronicsLDO regulatorSOT-233 pinsCanaan Microelectronics
- What it is
- LDO regulator
- Maker
- Canaan Microelectronics
- Package
- SOT-23
- Pins
- 3
- Details
- Linear voltage regulator IC: LDO, 2.7V±2%, 150mA
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
GS810C27SEUESOT-23Voltage supervisor, 3 pins, VishayVoltage supervisorSOT-233 pinsVishay
- What it is
- Voltage supervisor
- Maker
- Vishay
- Package
- SOT-23
- Pins
- 3
- Details
- CMOS-IC: Voltage Detector 2,7V, Reset Push-pull output, 150ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
IXD1421AB27ER-GUSP-6CLDO regulator, 6 pins, IXYSLDO regulatorUSP-6C6 pinsIXYS
- What it is
- LDO regulator
- Maker
- IXYS
- Package
- USP-6C
- Pins
- 6
- Details
- Linear voltage regulator IC: LDO, Dual out, Vo1/Vo2=2.85V±1%/3.30V±1%, 300mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
KIC77C27T2SOT-23Voltage supervisor, 3 pins, KECVoltage supervisorSOT-233 pinsKEC
- What it is
- Voltage supervisor
- Maker
- KEC
- Package
- SOT-23
- Pins
- 3
- Details
- Voltage detector IC: 2.7V±1%, -Reset ODO, Rdt=100ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
LN61FN5252MSOT-23Voltage supervisor, 3 pins, Shanghai Natlinear ElectronicsVoltage supervisorSOT-233 pinsShanghai Natlinear Electronics
- What it is
- Voltage supervisor
- Maker
- Shanghai Natlinear Electronics
- Package
- SOT-23
- Pins
- 3
- Details
- Voltage detector IC: 5.2V±2%, +Reset ODO, Rdt=50ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
LN61FN5252PSOT-89Voltage supervisor, 3 pins, Shanghai Natlinear ElectronicsVoltage supervisorSOT-893 pinsShanghai Natlinear Electronics
- What it is
- Voltage supervisor
- Maker
- Shanghai Natlinear Electronics
- Package
- SOT-89
- Pins
- 3
- Details
- Voltage detector IC: 5.2V±2%, +Reset ODO, 50ms Rt delay
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
NE85618-FBSOT-1434 pins, California Eastern LaboratoriesNot recordedSOT-1434 pinsCalifornia Eastern Laboratories
- What it is
- Not recorded
- Maker
- California Eastern Laboratories
- Package
- SOT-143
- Pins
- 4
- Details
- Si-npn: UHF, LN, 20V, 100mA, 150mW, B=80..160, 6,5Hz
- Source
- Published code list
Is it dead? The meter test is below: This part.
NE85639-27SOT-1434 pins, California Eastern LaboratoriesNot recordedSOT-1434 pinsCalifornia Eastern Laboratories
- What it is
- Not recorded
- Maker
- California Eastern Laboratories
- Package
- SOT-143
- Pins
- 4
- Details
- Si-npn: VHF/UHF, CATV, 20V, 100mA, 200mW, B=80..160, 7GHz
- Source
- Published code list
Is it dead? The meter test is below: This part.
1 more part has no package on record
KIC77C27M2Voltage supervisor, KECVoltage supervisorNot recordedNot recordedKEC
- What it is
- Voltage supervisor
- Maker
- KEC
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 2.7V±1%, -Reset ODO, Rdt=100ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
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.
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.
Integrated circuit
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.
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.
Printed with a code easy to misread as R27
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 R27
For a marking with its end worn or burnt off. Each code has a page of its own.
Codes not listed here are printed on 9 more parts.
Did you find your part?
Open this in the search to correct a character or try another package.