5.1K Ohm 0.1W 0603 1% SMD Resistor

 

If your board needs a 5.1k 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 5.1k ohm resistor in a small rectangular surface-mount body, built for precise voltage and current work in solar inverters and other power electronics where a steady low-mid value must hold. It fits circuit protection, voltage regulation, and signal processing jobs that need a fixed 5.1K 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 5.1k ohm 1% resistor holds its 5.1K value within 1%, so a board that calls for 5.1K gets between 5,049 and 5,151 ohm. The 5.1K value is a low-mid value: it passes more current than a high-value part at the same voltage, which is why it fits current work and protection jobs as well as voltage division. 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 5.1k ohm 0603 resistor for circuit protection, where it limits the current through a stage to a safe level, and for voltage regulation, where it takes a share of the voltage so the next stage sees the right level. It also fits signal processing, where a fixed resistance shapes or scales a signal. You can check the value from the marking: the 4-digit value code for this part is 5101, which reads as 510 followed by 1 zero, or 5,100 ohm. Some makers print the 3-digit code 512 on a body this small instead, and some print no marking at all, so the board list is the final check.

Key features

• 5.1K 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 22.6V)
• Temperature coefficient ±100 ppm/°C
• Wide temperature range: −55°C to +155°C
• 4-digit value code 5101; 3-digit code 512

Checks before you order

• Value: your board list must call for 5.1K. A nearby value is not the same part — 5K is close but it is not 5.1K, and if your board needs a different value, stop and check the board list again. A 24.9K 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-mid value 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 22.6V in steady use. At this value the power rating is the real limit: at 75V the part would use about 1.10W, 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 5.1K. 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 56K 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	5.1K Ohm (5,100 Ω)
Tolerance	±1% (5,049 to 5,151 ohm)
Power rating	0.1W at 70°C
Maximum working voltage	75V (series limit; the 0.1W rating caps this value at about 22.6V)
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	4-digit value code 5101; 3-digit code 512 (see the gates note)
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. 5.1k ohm is the plain name from its value. 5.1k ohm resistor is the name buyers use with the unit spelled out. 5.1k ohm 0603 resistor is the name buyers use when the body size matters. SMD resistor is the name for its surface-mount style. 5.1k ohm 1% is the short name that carries the value and the tolerance together. If your board list calls for 5.1K 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 5.1K mean?

It means 5,100 ohms of resistance. K stands for kilo, which means one thousand, so 5.1K is 5.1 × 1,000 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 5.1K, so between 5,049 and 5,151 ohms. 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 5101 marking on the body?

It is the 4-digit value code for this part: 510 stands for the digits 510, and the last 1 means one more zero, so 5101 means 5,100 ohms. Some makers print the 3-digit code 512 on a body this small instead, and some print no marking at all. There is no EIA-96 code for this value, because 51 is not an E96 series value.

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

No. At 5.1K the 0.1W rating is the limit that matters: it caps the steady voltage at about 22.6V. At 75V this part would use about 1.10W, 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 5.1K ohm 0.1W surface-mount resistor for stable and accurate resistance, with 1% tolerance for consistent performance in circuit protection, voltage regulation, and signal processing, in the 0603 package for compact electronic designs including solar inverters, power management systems, and industrial equipment, rated at 0.1W for low-power applications where efficiency and space-saving design are essential, for solar energy applications and general electronic circuits — and that use still stands.