20 OHM 1% 0.1W 0603 SMD RESISTOR

If your board needs a 20 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 20 ohm resistor in a small rectangular surface-mount body, built for accurate current regulation in solar inverters and power management circuits. It fits voltage regulation circuits and signal processing jobs that need a fixed 20 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 20 ohm 0603 resistor holds its 20 ohm value within 1%, so a board that calls for 20 ohm gets between 19.8 and 20.2 ohm. The 1% tolerance is what sets it apart from the common 5% chip parts — it holds its value far more tightly, which is what precision current regulation and voltage control need. 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 20 ohm resistor for current regulation, where it holds the current through a stage to a safe level, and for voltage control, where it takes a share of the voltage so the next stage sees the right level. It also fits current sensing, where the small voltage across it tells the circuit how much current is flowing. You can check the value on the top of the part: a 1% 20 ohm 0603 chip carries the EIA-96 marking 30X, which reads as 200 times 0.1, or 20 ohm.

Key features

• 20 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 (see the power-based limit in the checks)
• Temperature coefficient ±100 ppm/°C
• Wide temperature range: −55°C to +155°C
• EIA-96 marking 30X

Checks before you order

• Value: your board list must call for 20 ohm. A nearby value is not the same part — if your board needs a different value, stop and check the board list again. A 22 ohm SMD resistor in a larger 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 small part with little room for heat, so do not run it near its limit.
• Voltage: the voltage across this part must stay inside the limits in the table. From power alone, the working voltage for a 20 ohm part at 0.1W is about 1.41V, and the series cap is 75V — stay below both. Above that, this part is the wrong pick.
• Tolerance: the real value may sit up to 1% away from 20 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 10 ohm SMD resistor in a larger body is a different value and a different size 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. 20 ohm is the plain name from its value. 20 ohm 0603 resistor is the name buyers use when the body size matters. SMD resistor is the name for its surface-mount style. 0603 resistor is the short name from its body size. 20 ohm 1% is the short name that carries the value and the tolerance together. If your board list calls for 20 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 20 ohm mean?

It means 20 ohms of resistance. A resistor marked 20 ohm lets a known, fixed amount of current pass for a given voltage, and that fixed value is what the circuit is built around.

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 20 ohm, so between 19.8 and 20.2 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 marking 30X?

It is the EIA-96 code printed on a 1% 20 ohm 0603 chip. In the EIA-96 table, 30 stands for 200 and X stands for a multiplier of 0.1, so 200 times 0.1 is 20 ohm. The plain 3-digit code 200 is the code a 5% part would carry — a 1% part uses the EIA-96 marking instead.

Can I use a different value, like a nearby 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 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 20 ohm 0.1W surface-mount resistor for stable and efficient performance in solar inverters and power management circuits, with 1% tolerance for accurate current regulation, used in solar inverters, voltage regulation circuits, and signal processing, for precision voltage control and current sensing, a passive two-terminal resistor that implements electrical resistance as a circuit element, rectangular in shape with metal ends that make contact with the board through solder — and that use still stands.