SMD code K77
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.
K77 on a chip resistor
770 Ω
770 Ω resistor
The K is both the decimal point and the multiplier: 770 Ω.
Check it with a meter
Lift one end and measure across it. A good one reads 770 Ω. Measuring it in circuit reads the parallel combination of everything around it, which is almost always lower, never higher: well above 770 Ω on the board is a fault. Open, or well above 770 Ω, means it has failed: burnt, cracked or corroded. That does not change what to fit: the marking still says 770 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, SMB), K77 is a part code instead. Those parts are listed below.
4 parts are printed K77
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.
Schottky diode. What differs:
BAS70-07SOT-1434 pins, Galaxy MicroelectronicsSOT-1434 pinsGalaxy Microelectronics
- What it is
- Schottky diode
- Maker
- Galaxy Microelectronics
- Package
- SOT-143
- Pins
- 4
- Details
- 0.07A, 70V, Surface Mount Small Signal Schottky Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
BAT750SOT-233 pins, Galaxy MicroelectronicsSOT-233 pinsGalaxy Microelectronics
- What it is
- Schottky diode
- Maker
- Galaxy Microelectronics
- Package
- SOT-23
- Pins
- 3
- Details
- 0.75A, 40V, Surface Mount Small Signal Schottky Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
GSBAT750SOT-233 pins, Good-ArkSOT-233 pinsGood-Ark
- What it is
- Schottky diode
- Maker
- Good-Ark
- Package
- SOT-23
- Pins
- 3
- Details
- Schottky diode, 40 V, 750 mA
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
TBAS70-07SOT-1434 pins, Galaxy MicroelectronicsSOT-1434 pinsGalaxy Microelectronics
- What it is
- Schottky diode
- Maker
- Galaxy Microelectronics
- Package
- SOT-143
- Pins
- 4
- Details
- 0.07A, 70V, Surface Mount Small Signal Schottky Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky 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.
Printed with a code easy to misread as K77
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
Did you find your part?
Open this in the search to correct a character or try another package.