30K Ohm 0.25W 1206 1% SMD RESISTOR

 

If your board needs a 30k ohm 0.25w resistor, and the old part is a 1% 0.25W chip in a 1206 body, this is the part to order. It is a 30k ohm resistor in a small rectangular surface-mount body, built for stable voltage division and signal work in solar inverters and other electronic circuits where a steady high value must hold. It fits voltage regulation, signal conditioning, and power distribution jobs that need a fixed 30K value at up to 0.25W. It does not fit jobs that need a different resistance value, a through-hole body, or more than 0.25W 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 30k ohm 1% resistor holds its 30K value within 1%, so a board that calls for 30K gets between 29.7K and 30.3K. The high value is the point here: at the same voltage, a 30K 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 1206 body is about 3.1 mm long, so it fits boards where a larger part would not, while still handling a quarter of a watt.

Repair techs use a part like this as a 30k ohm 1206 resistor for voltage division, where it takes a share of the voltage so the next stage sees the right level, and for signal conditioning, where a fixed high resistance shapes or scales a signal without loading it down. It also fits power distribution, where a steady high value keeps a supply stage stable. You can check the value from the marking: the 4-digit value code for this part is 3002, which reads as 300 followed by 2 zeros, or 30,000 ohm. Some makers print the 3-digit code 303 instead, and some print no marking at all, so the board list is the final check.

Key features

• 30K Ohm fixed resistance, ±1% tolerance
• 0.25W power rating at 70°C ambient
• Thick film chip construction, surface mount
• 1206 body: about 3.10 mm × 1.60 mm × 0.55 mm
• Maximum working voltage 200V (series limit — the 0.25W rating caps this value at about 86.6V)
• Temperature coefficient ±100 ppm/°C
• Wide temperature range: −55°C to +155°C
• 4-digit value code 3002; 3-digit code 303

Checks before you order

• Value: your board list must call for 30K. A nearby value is not the same part — if your board needs a different value, stop and check the board list again. A 20K part in the same 1206 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 0.25W, and that 0.25W 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 0.25W with room to spare.
• Voltage: the voltage across this part must stay at or below about 86.6V in steady use. At this value the power rating is the real limit: at 200V the part would use about 1.33W, far above its rating, even though 200V is the series voltage limit. Work out the voltage from your circuit before you order.
• Tolerance: the real value may sit up to 1% away from 30K. 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 a 1206 surface-mount body. Measure the old part and match it against the pads and the space on your board. The series body is about 3.10 mm long, 1.60 mm wide, and 0.55 mm high — if your old part is much smaller, check the board list again before you order. A 30 ohm part in the same 1206 body is a different value for a different job, not a swap for this one.
• Fit for the job: if your circuit only needs a fraction of a quarter 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.

Specifications

All figures below are from the maker series documents for this chip 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).

Type	Thick film chip resistor, surface mount
Resistance	30K Ohm (30,000 Ω)
Tolerance	±1% (29.7K to 30.3K)
Power rating	0.25W at 70°C
Maximum working voltage	200V (series limit; the 0.25W rating caps this value at about 86.6V)
Maximum overload voltage	400V
Dielectric withstanding voltage	500V (see the gates note — the second series source gives 300V)
Temperature coefficient	±100 ppm/°C
Operating temperature range	−55°C to +155°C
Marking	4-digit value code 3002; 3-digit code 303 (see the gates note)
Body	3.10±0.10 × 1.60±0.10 × 0.55±0.10 mm
Derating	Full power to 70°C; derate above 70°C

Other names for the same part (good to know)

Shoppers and repair techs call this same part by a few names. 30k ohm 0.25w is the plain name from its value and power. 30k ohm 1206 resistor is the name buyers use when the body size matters. 30k ohm resistor is the name buyers use with the unit spelled out. SMD resistor is the name for its surface-mount style. 30k ohm 1% is the short name that carries the value and the tolerance together. If your board list calls for 30K at 0.25W with 1% tolerance in a 1206 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 30K mean?

It means 30,000 ohms of resistance. K stands for kilo, which means one thousand, so 30K is 30 × 1,000 ohms.

What does 1% mean, and what does 0.25W mean?

1% is the tolerance: the real resistance may sit up to 1% above or below 30K, so between 29.7K and 30.3K. 0.25W 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. 0.25W is one quarter of a watt.

What is the 3002 marking on the body?

It is the 4-digit value code for this part: 300 stands for the digits 300, and the last 2 means two more zeros, so 3002 means 30,000 ohms. Some makers print the 3-digit code 303 instead, and some print no marking at all. There is no EIA-96 code for this value, because 30 is not an E96 series value.

Can I use this part at 200 V if the power is small?

No. At 30K the 0.25W rating is the limit that matters: it caps the steady voltage at about 86.6V. At 200V this part would use about 1.33W, far above its rating. The 200V figure is the series voltage limit, not a voltage you can use at this value.

How do I fit a 1206 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 3.1 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 30K ohm 0.25W 1206 SMD resistor for use in solar inverters and other electronic applications, with accurate and stable electrical performance for circuits that require precise voltage regulation and signal conditioning, in a 1206 (3216 metric) package for space-constrained PCBs and efficient power distribution with reduced energy loss, with a 0.25W power rating for heat dissipation and durability in demanding environments, for solar inverters, power supplies, and automation systems, with easy integration into automated assembly processes — and that use still stands.