33K Resistor | Everything You Need to Know

33K Resistor is a crucial component in today’s electronic circuit. In our lives, we use a lot of electronics. Resistors are one of the most important components of the electronics. Resistors resist electric current, which ensures that electronics receive the appropriate amount of power.

The ’33K’ signifies its resistance value – 33,000 ohms. What elevates the 33K ohm resistor’s profile is its manufacturing quality, especially when produced by companies like PCBMay.

Based in China, PCBMay has garnered a reputation for crafting top-notch electronic components. PCBMay has been making Resistor PCB for a long time, and the 33K resistor is one of their many quality products.

Let’s know more about the 33K resistor.

What is a 33K Resistor?

Electronic components need to resist current to supply proper current to the electronic product. Resistors do the job of resisting current. Resistors have different values. Resistor values are measured in Ohm.

A 33K resistor is a fundamental electronic component with a specific resistance value of 33,000 ohms. It has a resistance of 33,000 ohms, represented by the symbol “33KΩ.”

33K resistor is used universally in electronic circuits. Their primary function is to manage the flow of electric current to other components, ensuring that these components are not damaged by excessive current.

33K resistor

33K resistor

The 33K resistor is used in various fields. From simple gadgets to complex industrial systems, you name it. Its value is particularly significant in circuits where a specific and controlled resistance is necessary.

Physical Characteristics of 33K Resistor

What do you see when you first look at the 33K resistor? A small cylindrical tube with leads coming out of each end. They typically have a diameter of 0.125 inches (3.18 mm) and a length of 0.25 inches (6.35 mm).

33K Resistors are designed to be mounted directly onto PCBs. These resistors are made of various materials such as carbon film, metal film, or metal oxide.

Carbon film: These are the most common type of resistor. Carbon film resistors have been here since the early 1900s and are still used today. Carbon film 33K resistors are made by depositing a thin film of carbon onto a ceramic core.

They are preferred for their low cost, high availability good performance in low-power applications.

Metal film: These resistors are made by depositing a thin film of metal onto a ceramic core. Metal films offer a tolerance between 1% to 2%, which makes them highly suitable for precision works.

Metal oxide: These resistors are made by depositing a thin film of metal oxide onto a ceramic core. They offer excellent performance at high temperatures and frequencies.

The tolerance of a 33k resistor indicates how much the actual resistance value can deviate from the nominal value. Common tolerances include 1%, 5%, and 10%.

Carbon Film 33K Resistor

Carbon Film 33K Resistor

Specifications and Features

To know more about the 33K resistor, let’s shed light on the specifications and features. These characteristics may depend on the type of material and construction of the resistor.

Power Rating

The power rating of a resistor like the 33K, often rated at 3 watts, represents the maximum power it can handle before it risks overheating. This rating determines how much heat the resistor can safely dissipate during operation.

Operating Temperature

The 33K resistor can typically operate within a temperature range of -55°C to 235°C. It ensures functionality across various environmental conditions without sustaining damage.

Operating Voltage

The maximum operating voltage for a 33K resistor can be as high as 350 volts, above which the resistor may be compromised or damaged.

Temperature Coefficient of Resistance (TCR)

The temperature coefficient of resistance (TCR) of a 33k resistor is the rate of change of resistance with temperature. It is expressed in parts per million per degree Celsius (ppm/°C).

The typical TCR values for 33k resistors are 50, 100, 200, and 300 ppm/°C. The TCR of a 33k resistor can be positive or negative, depending on the material and the construction of the resistor.


The noise of a 33k resistor is the unwanted variation of the resistance value due to the thermal agitation of the electrons. The higher the noise, the more interference the resistor causes in the signal.

The noise of a 33k resistor depends on the resistance, the temperature, and the bandwidth of the resistor. The noise figure of a 33k resistor is typically between 0 and 10 dB.

The Noise Figure of a 33K Resistor Is Typically Between 0 and 10 Db

The Noise Figure of a 33K Resistor Is Typically Between 0 and 10 Db

Frequency Response

The frequency response is typically associated with parameters like rise time, which is the time a resistor takes to respond to a step or pulse input. The typical fast rise time of a 33K resistor is  20 nanoseconds or less.

What Is the Color Code for a 33K Resistor?

Have you ever wondered what the colors on the resistors are? 33k resistor is very small in size. Its body diameter is 2.3mm and its body Length is 6mm so printing the resistance value is quite difficult.

That’s why the color bands are printed on the resistance to present the resistance. These color bands are called resistor color codes.

The color code for a 33K resistor, which represents a resistance value of 33,000 ohms, follows the 4-band color code system. This system uses colored bands painted on the resistor’s body to denote its resistance value and tolerance.

For a 33K resistor, the color code is composed of the following bands:

Band NumberColorRepresentsValue
First BandOrangeFast digit3
Second BandOrangeSecond digit3
Third bandOrangeMultiplier1000
Fourth bandGoldTolerance±5%

The reading of the band should be left to right. The first two orange bands indicate the first two digits of the resistance value (33), the third orange band specifies that this number should be multiplied by 1,000, and the final gold band denotes a tolerance of ±5%.

The resulting resistance value is 33 kilohms, with a possible variance of plus or minus 5% from this stated value.

Color Code of 33K Resistor

Color Code of 33K Resistor

Other color codes for 33k resistors are:



Advantages and Disadvantages of 33K Resistor

Let’s look at the advantages and disadvantages of a 33k resistor. This section will help you make an informed decision on a 33k resistor.



A 33K resistor with high precision is essential in applications where exact resistance values are crucial for the circuit’s performance. Metal film 33k resistors often offer this precision, with a tolerance as tight as ±0.1%.

Simple Identification

33K resistors are easily identified through their color coding scheme, with orange-orange-orange-gold bands representing a 5% tolerance value. This eliminates the need for complex measurement equipment and simplifies circuit construction.

Compact and Lightweight

33K resistors are available in both axial-leaded and surface-mount packages, allowing for compact circuit designs. This is especially beneficial for miniaturized electronics and portable devices.

Low Inductance

Compared to other types of resistors, such as wire-wound resistors, 33K resistors exhibit low inductance. This makes them suitable for high-frequency applications where unwanted electromagnetic interference needs to be minimized.


33K resistors are readily available and relatively inexpensive compared to other types of resistors with similar resistance values. This makes them ideal for budget-conscious projects and mass production.


Limited power dissipation

Most 33K resistors have a power rating of 1/4 watt or 1/2 watt. This limits their applications in circuits where high power levels are involved.

Tolerance variations

While commonly available in 5% tolerance, some applications require higher precision. For such cases, alternative resistor types with tighter tolerances, like metal film resistors, might be necessary.

Noise Generation

Carbon film 33K resistors can generate relatively more noise compared to metal film or metal oxide film resistors. This can be a concern in sensitive circuits where noise needs to be minimized.

Temperature Sensitivity

33K resistors show a temperature coefficient of resistance (TCR), meaning their resistance value changes with temperature fluctuations. This requires careful consideration in circuits where precise resistance values are crucial across varying temperatures.

Limited Shelf Life

Over time, especially in humid environments, the resistance value of 33K resistors can drift, affecting circuit performance. This necessitates periodic replacement in critical applications.

Applications of 33K Resistor

33K resistor is mostly used for its versatility, affordability and it’s easy identification. Here are some of the most common uses of this readily available and affordable component:

Voltage Dividers: 33K resistors are frequently used in voltage divider circuits, where they divide a higher input voltage into two lower output voltages. This is essential for powering components that require a specific voltage lower than the source voltage.

Pull-up Resistors: In digital circuits, 33K resistors act as pull-up resistors, ensuring that an input pin remains high when left floating. This helps prevent unwanted signals and improves circuit stability.

33K Resistors Act as Pull-up Resistors in Digital Circuit

33K Resistors Act as Pull-up Resistors in Digital Circuit

Current Limiting Resistors: When used in series with LEDs or other current-sensitive components, 33K resistors limit the current flow, protecting them from damage and ensuring their proper operation.

Biasing Circuits: In amplifiers and other analog circuits, 33K resistors are used for biasing active elements like transistors. They set the operating point of these elements, ensuring they function within their optimal range.

Signal Filtering: 33K resistors, in conjunction with capacitors, can be used to filter out unwanted noise and interference in signals. This is crucial for improving the signal quality and ensuring reliable data transmission.

Timing Circuits: In timer circuits, 33K resistors, along with capacitors, can be used to control the time constant, determining the delay or pulse duration in the circuit. This allows for precise timing operations in various applications.

Logic Gates: In some logic gate circuits, 33K resistors are used for pull-up or pull-down functions, ensuring the correct logic levels at the output pin. This helps to maintain the desired logic operation within the circuit.

Sensor Interfaces: When interfacing sensors with microcontrollers, 33K resistors can be used to adjust the signal levels or protect the microcontroller from damage. This ensures proper communication between the sensor and the microcontroller.

Arduino and Raspberry Pi Projects: 33K resistors are widely used in various Arduino and Raspberry Pi projects due to their affordability and versatility. They are used in voltage dividers, LED circuits, pull-up resistors, and many other applications within these popular platforms.

Prototyping and DIY Projects: 33K resistors are a staple component for electronics enthusiasts and hobbyists. Their readily available nature and ease of use make them ideal for prototyping circuits and exploring various electronics concepts in DIY projects.

Educational Purposes: In electronics education, 33K resistors provide a valuable learning tool for students to understand the concepts of resistance, voltage division, current limiting, and other fundamental electronic principles.

Industrial Applications: Due to their reliability and wide range of values, 33K resistors find applications in various industrial electronics, including control systems, power supplies, and instrumentation.

Medical Equipment: In medical equipment, 33K resistors ensure the safe and precise operation of various electronic components, contributing to reliable and accurate diagnoses and treatments.

Consumer Electronics: From smartphones and laptops to TVs and gaming consoles, 33K resistors are ubiquitous in consumer electronics, playing vital roles in various circuits within these devices.


Frequently Asked Questions

1. What Is The Power Rating Of A 33k Ohm Resistor?

Power Rating of a 33K Ohm Resistor?

The power rating for a 33K ohm resistor can vary, but a typical wire-wound version might have a power rating of 50 watts​​.

2. How Do I Identify A 33k Ohm Resistor In A Circuit?

A 33K ohm resistor can be identified in a circuit by its color code: orange, orange, orange, gold, which corresponds to the resistance value and tolerance.

3. Where Can I Get a 33K Resistor?

A 33K resistor can be purchased from electronics component distributors, online retailers like Newark or Digi-Key, or at local electronics stores.


In the vast landscape of electronic components, the 33K resistor emerges as a staple in circuit design, lauded for its precision and versatility. With a resistance value of 33,000 ohms, it stands as a crucial element in managing current flow, ensuring stability across a spectrum of applications from timing circuits to digital logic systems.

PCBmay, with its longstanding history in the industry, exemplifies such reliability and expertise in producing 33K resistors. For enthusiasts and professionals in need of this component, you can contact us anytime or get a quote.

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