49.9K OHM 0.25W 1206 1% SMD RESISTOR

 

If your board needs a 49.9k 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 49.9k 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 processing, and circuit protection jobs that need a fixed 49.9K 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 49.9k ohm 1% resistor holds its 49.9K value within 1%, so a board that calls for 49.9K gets between 49.401K and 50.399K. The high value is the point here: at the same voltage, a 49.9K 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 49.9k 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 processing, where a fixed high resistance shapes or scales a signal without loading it down. It also fits circuit protection, where a steady high value guards a sensitive stage. You can check the value from the marking: the 4-digit value code for this part is 4992, which reads as 499 followed by 2 zeros, or 49,900 ohm. The EIA-96 code for the same value is 68C, where 68 stands for 499 and C means ×100.

Key features

• 49.9K 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 111.7V)
• Temperature coefficient ±100 ppm/°C
• Wide temperature range: −55°C to +155°C
• 4-digit value code 4992; EIA-96 code 68C

Checks before you order

• Value: your board list must call for 49.9K. A nearby value is not the same part — if your board needs a different value, stop and check the board list again. A 499 ohm 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 111.7V in steady use. At this value the power rating is the real limit: at 200V the part would use about 0.80W, 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 49.9K. 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 1K 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	49.9K Ohm (49,900 Ω)
Tolerance	±1% (49.401K to 50.399K)
Power rating	0.25W at 70°C
Maximum working voltage	200V (series limit; the 0.25W rating caps this value at about 111.7V)
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 4992; EIA-96 code 68C (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. 49.9k ohm 0.25w is the plain name from its value and power. 49.9k ohm resistor is the name buyers use with the unit spelled out. 49.9k ohm 1206 resistor is the name buyers use when the value and the body size both matter. SMD resistor is the name for its surface-mount style. 49.9k ohm 1% is the short name that carries the value and the tolerance together. If your board list calls for 49.9K 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 49.9K mean?

It means 49,900 ohms of resistance. K stands for kilo, which means one thousand, so 49.9K is 49.9 × 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 49.9K, so between 49.401K and 50.399K. 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 4992 marking on the body?

It is the 4-digit value code for this part: 499 stands for the digits 499, and the last 2 means two more zeros, so 4992 means 49,900 ohm. The EIA-96 code for the same value is 68C, where 68 stands for 499 and C means ×100. There is no 3-digit code for this value, because a 3-digit code carries only two significant digits and this value needs three.

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

No. At 49.9K the 0.25W rating is the limit that matters: it caps the steady voltage at about 111.7V. At 200V this part would use about 0.80W, 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 49.9K ohm 0.25W 1206 SMD resistor, a high-precision component for efficient performance in electronic circuits, including solar inverters, in a 1206 SMD package for compact size and easy surface mounting, with a 0.25W power rating for stable resistance, minimising power fluctuations and enhancing circuit reliability, with 1% tolerance for high accuracy in sensitive power management and signal processing, engineered for durability with thermal stability and low noise, widely used in renewable energy applications including solar inverters, for efficient power regulation and optimised energy conversion, for industrial, automotive, and power electronics, for voltage regulation or circuit protection; and as a tiny surface-mount resistor used in solar inverters to precisely control electrical current, with 49.9K-ohms helping regulate voltage and protect sensitive components from excessive current flow, a 0.25W rating that safely handles small electrical loads without overheating, the 1206 (3216 metric) size for modern circuit boards, 1% tolerance for stable performance in solar inverters, commonly used in voltage dividers, signal processing, and circuit protection — and that use still stands.