330K Ohm 1/2W 5% Carbon Film Fixed Resistor

If your board needs a 330k ohm resistor, and the old part is a 1/2W carbon film part with 5% tolerance, this is the part to order. It is a 330k ohm resistor in an axial through-hole body, built for voltage regulation, current control, and filtering where a small resistor would run too hot and a low value would pass too much current. It fits power supplies, inverter repair, and general circuit work that needs a fixed 330K value at up to 1/2W. It does not fit jobs that need a different resistance value, a surface-mount body, or more than 1/2W 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 carbon film resistor does that job with a thin carbon layer on a ceramic rod, which gives steady performance at low cost for standard circuit designs. This 330k ohm 1/2w resistor holds its 330K value within 5%, so a board that calls for 330K gets between 313.5K and 346.5K. The high value is the point here: at the same voltage, a 330K part passes far less current than a low-value part, which is why it fits voltage regulation and filtering rather than heavy load work. The 1/2W rating means it can still turn real power into heat without damage, as long as the cooling and the voltage limits below are respected.

Repair techs use a part like this as a 330k ohm resistor for voltage regulation, where it takes a share of the voltage so the next stage sees the right level, and for current control, where it holds a small current to a safe level. It also fits filtering and power distribution work, where a fixed high resistance sets a level or a path. It is an axial resistor, so it mounts through holes on a board, not on the surface. Its colour bands are orange, orange, yellow, gold.

Key features

• 330K Ohm fixed resistance, ±5% tolerance
• 1/2W power rating at 70°C ambient
• Carbon film construction for dependable, low-cost, stable work
• Axial leads for through-hole mounting on PCBs and breadboards
• Maximum working voltage 300V
• Temperature coefficient −700~0 ppm/°C (values from 100K to 1M)
• Wide temperature range: −55°C to +155°C

Checks before you order

• Value: your board list must call for 330K. A nearby value is not the same part — 33K is ten times smaller and 3.3M is ten times bigger, so read the value twice. If your board needs a different value, stop and check the board list again. A 150K part in the same family is a different job, not a swap for this one.
• Power and heat: the power this part turns into heat must stay at or below 1/2W, and that 1/2W counts only up to 70°C ambient — above that, the safe power drops toward zero at 155°C, 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 1/2W with room to spare.
• Voltage: the voltage across this part must stay at or below the 300V series cap. From power alone the figure would be higher (about 406V at 1/2W), so the 300V 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 5% away from 330K. If your circuit needs tighter than 5%, 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 axial through-hole body. Measure the old part and match it against the holes and the space on your board. The series normal-style body for a 1/2W part is about 9.0 mm long and 3.3 mm across — if your old part is much bigger, check the board list again before you order.
• Fit for the job: if your circuit only needs a fraction of a watt, this part still works, but a 51K part rated 2W is a different job, not a swap for this one. Match the value first, then the power, then the body.

Specifications

All figures below are from the maker series documents for this resistor family. 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. 330k ohm resistor is the plain name from its value. 330k ohm 1/2w resistor is the name buyers use when the power rating matters. Carbon film resistor is the name for its construction type. Axial resistor is the name for its lead style. 330k ohm 5% is the short name that carries the value and the tolerance together. If your board list calls for 330K at 1/2W with 5% tolerance in an axial 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 330K mean?

It means 330,000 ohms of resistance. K stands for kilo, which means one thousand, so 330K is 330 × 1,000 ohms.

What does 1/2W mean, and what does 5% mean?

1/2W 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. 5% is the tolerance: the real resistance may sit up to 5% above or below 330K, so between 313.5K and 346.5K.

Why would a circuit need such a high value?

A high value passes little current at a given voltage, which suits voltage regulation and filtering. It sets a level or limits a small current without loading the circuit down. A low-value part in the same spot would pass far more current and change how the circuit behaves.

Can I use a different value, like a nearby kilo-ohm part?

No, not without checking the circuit. A resistor value sets the current and the voltage drop, so a different value changes how the circuit behaves. Only swap in a different value if the circuit design allows it — otherwise match the board list exactly.

How do I read the colour bands?

Orange, orange, yellow, gold. The first two bands give the digits 3 and 3, the yellow band means multiply by 10,000, which gives 330,000 ohms, and the last gold band means ±5% tolerance.

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 reliable component for stable voltage regulation and current control in solar inverter repairing and other electronic applications, for circuit protection, filtering, and power distribution, with carbon film construction for low noise and thermal stability in sensitive power circuits, used in inverter maintenance, power supplies, and general electronics, for professionals and DIY enthusiasts — and that use still stands.