510k Ohm 0.125W 0805 1% SMD Resistor

If your board needs a 510k ohm resistor, and the old part is a 1% 0.125W chip in an 0805 body, this is the part to order. It is a 510k ohm resistor in a small rectangular surface-mount body, built for stable voltage regulation and signal work in solar inverters and other electronic circuits where a steady high value must hold. It fits voltage regulation, circuit stability, and energy-efficient design jobs that need a fixed 510K value at up to 0.125W. It does not fit jobs that need a different resistance value, a through-hole body, or more than 0.125W of power. Check the checks below before you order, so the value, the power, the voltage, and the body all match your board.

This is an original, high-quality part.

What it does

A resistor limits current and drops voltage in a circuit. A chip resistor does that job as a small flat part that solders straight onto the pads of a board, with metal ends that make the contact. This 510k ohm 1% resistor holds its 510K value within 1%, so a board that calls for 510K gets between 504.9K and 515.1K. The high value is the point here: at the same voltage, a 510K part passes far less current than a low-value part, which is why it fits voltage division and signal work rather than heavy load work. The 0805 body is about 2.0 mm long, so it fits boards where a larger part would not, while still handling an eighth of a watt.

Repair techs use a part like this as a 510k ohm 0805 resistor for voltage regulation, where it takes a share of the voltage so the next stage sees the right level, and for signal work, where a fixed high resistance shapes a signal without loading it down. It also fits high-frequency circuits, where a steady high value keeps a stage stable without wasting power. You can check the value from the marking: the 4-digit value code for this part is 5103, which reads as 510 followed by 3 zeros, or 510,000 ohm. The 3-digit code for the same value is 514.

Key features

• 510K Ohm fixed resistance, ±1% tolerance
• 0.125W power rating at 70°C ambient
• Thick film chip construction, surface mount
• 0805 body: about 2.00 mm × 1.25 mm × 0.50 mm
• Maximum working voltage 150V (series limit — this is the cap that binds for this value)
• Temperature coefficient ±100 ppm/°C
• Wide temperature range: −55°C to +155°C
• 4-digit value code 5103; 3-digit code 514

Checks before you order

• Value: your board list must call for 510K. A nearby value is not the same part — if your board needs a different value, stop and check the board list again. A 240 ohm part in the same 0805 body is a different value for a different job, not a swap for this one.
• Power and heat: the power this part turns into heat must stay at or below 0.125W, and that 0.125W counts only up to 70°C ambient — above that, the safe power drops, so check the derating for your real working temperature. Work out the power from your real voltage and current (power = voltage × current) and keep it inside 0.125W with room to spare.
• Voltage: the voltage across this part must stay at or below the 150V series cap. From power alone the figure would be higher (about 252V at 0.125W), so the 150V cap is the limit that binds — stay below it. Above that, this part is the wrong pick.
• Tolerance: the real value may sit up to 1% away from 510K. If your circuit needs tighter than 1%, this part is the wrong pick — do not hope the part you get sits near the middle.
• Body and fit: your board must take an 0805 surface-mount body. Measure the old part and match it against the pads and the space on your board. The series body is about 2.00 mm long, 1.25 mm wide, and 0.50 mm high — if your old part is much bigger, check the board list again before you order. A 510 ohm part in a 2512 body is the same value in a bigger body for a different job, not a swap for this one.
• Fit for the job: if your circuit only needs a fraction of an eighth of a watt, this part still works. Match the value first, then the power, then the body — a through-hole resistor is the wrong shape for a surface-mount board, even if the value matches. A 1206 part is the wrong size for 0805 pads, even if the value matches.

Specifications

All figures below are from the maker series documents for this chip resistor family, for the 0805 size. No figure here was guessed. The maker of the exact part on this page is not stated on the live page, so the publisher should confirm the series figures against the Download file at publish time (see the gates note).

Other names for the same part (good to know)

Shoppers and repair techs call this same part by a few names. 510k ohm is the plain name from its value. 510k ohm resistor is the name buyers use with the unit spelled out. 510k ohm 0805 resistor is the name buyers use when the body size matters. SMD resistor is the name for its surface-mount style. 510k ohm 1% is the short name that carries the value and the tolerance together. If your board list calls for 510K at 0.125W with 1% tolerance in an 0805 body, this page is the right match. Do not judge by size alone — check the value, the power, and the tolerance too.

Frequently Asked Questions

What does 510K mean?

It means 510,000 ohms of resistance. K stands for kilo, which means one thousand, so 510K is 510 × 1,000 ohms.

What does 1% mean, and what does 0.125W mean?

1% is the tolerance: the real resistance may sit up to 1% above or below 510K, so between 504.9K and 515.1K. 0.125W is the power rating: the most power the part can turn into heat without damage, rated at 70°C ambient, with less allowed as it gets hotter. 0.125W is one eighth of a watt.

What is the 5103 marking on the body?

It is the 4-digit value code for this part: 510 stands for the digits 510, and the last 3 means three more zeros, so 5103 means 510,000 ohm. The 3-digit code for the same value is 514. There is no EIA-96 code for this value, because 510 is not an E96 series value.

Can I use this part above 150 V if the power is small?

No. The maximum working voltage is 150 V, and it applies even when the power is tiny. At 510K the current is always small, so voltage, not power, is the limit to watch.

How do I fit an 0805 chip resistor?

Solder it onto the matching pads on the board — it has no leads, so it sits flat on the pads. Check the pad spacing against the 2.0 mm body before you solder, use a fine tip and a small amount of solder, and do not overheat the part.

What is the price of this part?

Check the live price on the website. The price shown on the product page is the current one.

Use note kept from the old page: this part was listed before as a 510K ohm 0.125W 0805 SMD resistor, a high-precision electronic component for efficient voltage regulation and circuit stability in solar inverters, in a compact 0805 and 2012 package for easy surface mounting and space-efficient PCB designs, with a 0.125W power rating for reliable performance in low-power applications while maintaining thermal stability, with 1% tolerance for accurate resistance values critical for solar power systems, improving efficiency and performance, built with high-quality materials for durability and long-term reliability in demanding environments, with a stable resistance value for precise current flow, for solar inverter circuits and other power-sensitive applications, the 2012 resistor for high-frequency circuits and energy-efficient designs with minimal power loss, for commercial or industrial solar applications, for enhanced circuit performance while reducing energy wastage — and that use still stands.