499 Ohm 0.1W 0603 1% SMD Resistor

If your board needs a 499 ohm resistor, and the old part is a 1% 0.1W chip in a 0603 body, this is the part to order. It is a 499 ohm resistor in a small rectangular surface-mount body, built for precise work in solar inverters and other electronic circuits where a steady value must hold. It fits voltage regulation, power management, and energy conversion jobs that need a fixed 499 ohm value at up to 0.1W. It does not fit jobs that need a different resistance value, a through-hole body, or more than 0.1W 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 499 ohm 1% resistor holds its 499 ohm value within 1%, so a board that calls for 499 ohm gets between 494.01 and 503.99 ohm. The 499 ohm value is a mid value: it passes far less current than a low-value part at the same voltage, so it fits sensing, dividing, and regulation work, while the small 0603 body keeps it out of the way on crowded boards. The 0603 body is only about 1.6 mm long, so it fits boards where space is tight.

Repair techs use a part like this as a 499 ohm 0603 resistor for voltage regulation, where it takes a share of the voltage so the next stage sees the right level, and for power management, where a steady value keeps a supply stage stable. It also fits energy conversion work, where a fixed resistance sets a level without wasting power. You can check the value from the marking: the 4-digit value code for this part is 4990, which reads as 499 followed by no more zeros, or 499 ohm. The EIA-96 code for the same value is 68A, where 68 stands for 499 and A means ×1.

Key features

• 499 Ohm fixed resistance, ±1% tolerance
• 0.1W power rating at 70°C ambient
• Thick film chip construction, surface mount
• 0603 body: about 1.60 mm × 0.80 mm × 0.45 mm
• Maximum working voltage 75V (series limit — the 0.1W rating caps this value at about 7.1V)
• Temperature coefficient ±100 ppm/°C
• Wide temperature range: −55°C to +155°C
• 4-digit value code 4990; EIA-96 code 68A

Checks before you order

• Value: your board list must call for 499 ohm. A nearby value is not the same part — if your board needs a different value, stop and check the board list again. A 150 ohm part in the same 0603 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 0.1W, and that 0.1W 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 0.1W with room to spare. This is a low-power part, so even a small voltage across it makes real power — do not run it near its limit.
• Voltage: the voltage across this part must stay at or below about 7.1V in steady use. At this value the power rating is the real limit: at 75V the part would use about 11.3W, far above its rating, even though 75V 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 499 ohm. 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 0603 surface-mount body. Measure the old part and match it against the pads and the space on your board. The series body is about 1.60 mm long, 0.80 mm wide, and 0.45 mm high — if your old part is much bigger, check the board list again before you order. A 499k part in the same 0603 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 tenth 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).

Other names for the same part (good to know)

Shoppers and repair techs call this same part by a few names. 499 ohm is the plain name from its value. 499 ohm resistor is the name buyers use with the unit spelled out. 499 ohm 0603 resistor is the name buyers use when the body size matters. SMD resistor is the name for its surface-mount style. 499 ohm 1% is the short name that carries the value and the tolerance together. If your board list calls for 499 ohm at 0.1W with 1% tolerance in a 0603 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 499 ohm mean?

It means 499 ohms of resistance. Ohm is the unit of resistance, so a 499 ohm part resists current flow by 499 ohms.

What does 1% mean, and what does 0.1W mean?

1% is the tolerance: the real resistance may sit up to 1% above or below 499 ohm, so between 494.01 and 503.99 ohm. 0.1W 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 4990 marking on the body?

It is the 4-digit value code for this part: 499 stands for the digits 499, and the last 0 means no more zeros, so 4990 means 499 ohm. The 3-digit code for the same value is 499, and the EIA-96 code is 68A, where 68 stands for 499 and A means ×1.

Can I use this part at 75 V if the power is small?

No. At 499 ohm the 0.1W rating is the limit that matters: it caps the steady voltage at about 7.1V. At 75V this part would use about 11.3W, far above its rating. The 75V figure is the series voltage limit, not a voltage you can use at this value.

How do I fit a 0603 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 1.6 mm body before you solder, use a fine tip and a small amount of solder, and do not overheat the part. A magnifier helps, because the part and its marking are very small.

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 499 ohm 0603 SMD resistor for efficient and stable performance in solar inverters and other electronic circuits, with 1% tolerance for accurate resistance values and fewer errors in sensitive applications, for compact PCB layouts, for low-power circuit work, for high-efficiency energy conversion in solar inverters, voltage regulation circuits, and power management applications — and that use still stands.