402K Ohm 0.25W 1206 1% SMD Resistor

 

If your board needs a 402k 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 402k ohm resistor in a small rectangular surface-mount body, built for precision work in solar inverters and other electronic circuits where a steady high value must hold. It fits voltage division, signal work, and sensing jobs that need a fixed 402K 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 402k ohm 1% resistor holds its 402K value within 1%, so a board that calls for 402K gets between 397.98K and 406.02K. The 402K value is an E96 value — a fine step in the precision series — which is why it fits feedback and sensing, where the exact value sets how the circuit behaves. 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 402k ohm 1206 resistor for voltage division, where it takes a share of the voltage so the next stage sees the right level, and for sensing, where a fixed high resistance sets a level without loading the circuit down. It also fits signal work, where a steady high value keeps a signal path clean. You can check the value from the marking: the EIA-96 code for this part is 59D, which reads as 402 times 1,000, or 402,000 ohm. The 4-digit value code for the same part is 4023.

Key features

• 402K 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 power rating would allow about 317V)
• Temperature coefficient ±100 ppm/°C
• Wide temperature range: −55°C to +155°C
• EIA-96 marking 59D; 4-digit value code 4023

Checks before you order

• Value: your board list must call for 402K. A nearby value is not the same part — a 400K part is close but not the same E96 value, so if your board needs 402K, stop and check the board list again. A 10K 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 the 200V series cap. From power alone the figure would be higher (about 317V at 0.25W), so the 200V 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 402K. 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 665K 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. The same 402K value in a smaller 0603 body is a different footprint, so it does not drop into 1206 pads.

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	402K Ohm (402,000 Ω)
Tolerance	±1% (397.98K to 406.02K)
Power rating	0.25W at 70°C
Maximum working voltage	200V
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	EIA-96 code 59D (402 × 1,000 = 402,000Ω); 4-digit value code 4023 (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. 402k ohm 0.25w is the plain name from its value and power. 402k ohm resistor is the name buyers use with the unit spelled out. 402k ohm 1206 resistor is the name buyers use when the body size matters. SMD resistor is the name for its surface-mount style. 402k ohm 1% is the short name that carries the value and the tolerance together. If your board list calls for 402K 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 402K mean?

It means 402,000 ohms of resistance. K stands for kilo, which means one thousand, so 402K is 402 × 1,000 ohms. It is an E96 value, a fine step in the precision resistor series.

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 402K, so between 397.98K and 406.02K. 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.

What is the 59D marking on the body?

It is the EIA-96 code printed on a 1% 402K 1206 chip. In the EIA-96 table, 59 stands for 402 and D stands for a multiplier of 1,000, so 59D means 402 times 1,000, or 402,000 ohms. The 4-digit value code for the same part is 4023.

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

No. The maximum working voltage is 200 V, and it applies even when the power is tiny. At 402K the current is always small, so voltage, not power, is the limit to watch.

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 402K ohm 0.25W 1206 SMD resistor for precision and durability in solar inverter applications, for stable and reliable operation, with a 402K ohm resistance and 1% tolerance for accurate performance in electronic circuits, in the compact 1206 package for space-constrained designs, with a 0.25W power rating for efficient handling of power loads, built to withstand high temperatures and demanding conditions, for solar inverters and other renewable energy systems, for long-lasting performance with reduced maintenance costs and downtime, for upgrading an existing setup or building a new solar inverter, for seamless integration and optimal efficiency — and that use still stands.