90.9K Ohm 0.1W 0603 1% SMD Resistor

 

If your board needs a 90.9k 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 90.9k ohm resistor in a small rectangular surface-mount body, built for steady voltage division and signal processing in solar inverters and power management circuits. It fits current sensing, feedback control, and voltage regulation jobs that need a fixed 90.9K 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 90.9k ohm 1% resistor holds its 90.9K value within 1%, so a board that calls for 90.9K gets between 89.991K and 91.809K. The 90.9K value is an E96 value — a fine step in the precision series — which is why it fits feedback control and sensing, where the exact value sets the circuit’s behaviour. 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 90.9k 0603 resistor for voltage division, where it takes a share of the voltage so the next stage sees the right level, and for current sensing, where the small voltage across it tells the circuit how much current is flowing. It also fits feedback control, where a fixed resistance sets the point a control loop holds to. You can check the value on the top of the part: a 1% 90.9K 0603 chip carries the EIA-96 marking 93C, which reads as 909 times 100, or 90,900 ohm.

Key features

• 90.9K 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 93C

Checks before you order

• Value: your board list must call for 90.9K. A nearby value is not the same part — a 91K part is close but not the same E96 value, so if your board needs 90.9K, stop and check the board list again. An 82k 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 small part with little room for heat, so do not run it near its limit.
• Voltage: the voltage across this part must stay at or below the 75V series cap. From power alone the figure would be higher (about 95V at 0.1W), so the 75V 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 90.9K. 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 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).

Type	Thick film chip resistor, surface mount
Resistance	90.9K Ohm (90,900 Ω)
Tolerance	±1% (89.991K to 91.809K)
Power rating	0.1W at 70°C
Maximum working voltage	75V
Maximum overload voltage	150V
Dielectric withstanding voltage	150V (see the gates note — the second series source gives 100V)
Temperature coefficient	±100 ppm/°C
Operating temperature range	−55°C to +155°C
Marking	EIA-96 code 93C (909 × 100 = 90,900Ω)
Body	1.60±0.10 × 0.80±0.10 × 0.45±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. 90.9k ohm is the plain name from its value. 90.9k ohm resistor is the name buyers use with the unit spelled out. 90.9k 0603 resistor is the name buyers use when the body size matters. SMD resistor is the name for its surface-mount style. 90.9k ohm 1% is the short name that carries the value and the tolerance together. If your board list calls for 90.9K 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 90.9K mean?

It means 90,900 ohms of resistance. K stands for kilo, which means one thousand, so 90.9K is 90.9 × 1,000 ohms. It is an E96 value, a fine step in the precision resistor series.

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 90.9K, so between 89.991K and 91.809K. 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 93C marking on the body?

It is the EIA-96 code printed on a 1% 90.9K 0603 chip. In the EIA-96 table, 93 stands for 909 and C stands for a multiplier of 100, so 93C means 909 times 100, or 90,900 ohms. The 4-digit value code for the same part is 9092.

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

No. The maximum working voltage is 75 V, and it applies even when the power is tiny. At 90.9K the current is always small, so voltage, not power, is the limit to watch.

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 compact and precise 90.9K ohm 0.1W SMD resistor for stable performance, for current flow regulation with high accuracy in voltage division and signal processing, for current sensing, feedback control, and voltage regulation in solar inverter systems, power management, and signal conditioning — and that use still stands.