Technical
PCB related knowledge- The purpose of each layer of the PCB
How to do heat resistance testing for PCB board
Detailed explanation of rigid-flex board and IC carrier board
PCBA prototype procedure
Defects which can be detected by the SPI
What are the spacing requirements for designing PCB circuit boards?
What are the classification and advantages of PCB metal substrates?
Difference between the processing technology of 1Layer AL PCB and 2Layer AL PCB
Introduction of FPC Cable and its usage
advantages of Shenzhen SMT assembly factory
inspection items before PCB ordering
usages of ceramic substrates
main applications of PCB boards
Cost-effective PCB product services
How to check short circuit of a circuit board during manual soldering
Identify the polarity of electronic components during PCBA processing
Means Which Can Prevent Component Shifting in SMT Processing
Skills of PCB prototype manual soldering
Reasons for the shift of Components in the SMT Process
Seven Types of PCB Probes
What Should Be Paid Attention to in Layout of High-frequency PCB
Precautions for PCB CCL Selection
Advantages of LED Plant growth light
Advantages of using LED grow lights to grow industrial hemp
Detailed explanation of PCB manufacturing process and precautions
Detailed explanation of PCB manufacturing process and precautions
How to draw multilayer PCB on Altium Designer
Three basic elements of interference and how to suppression them.
Decrease interference between digital circuit and analog circuit
SMT Component Placement Process Of Parts : Manual Placement
SMT factory incoming PCB material inspection
Basic concepts commonly used in PCB design
Ideas and principles of High speed PCB layout
Component layout rules and safety distance considerations
SMT assembly process quality specification
5 points in PCB layout
Professional interpretation of SMT
Advantages and disadvantages of different PCB surface treatment
Special process in PCB prototype
Why the via hole become open after component assembly
Keep the cost of the PCB as low as possible
what are the causes of PCB board heating radiation problem
Pad size and via diameter dimensions consideration in PCB prototyping
How to Judge the Acceptance of PCB Quality
Which Color Circuit Board Sells the Most Expensive
Method to Solve the Noise Interference of Power Supply on High-frequency PCB Board
Disassembly Skills of Chip Components on PCB
What Factors Should Be Considered in the Selection of High-frequency PCB CCL
How to Place Special Components during PCB Layout
What Are the Functions of Capacitors in Circuits?
Testing Techniques for Common Electronics Components
What to do if There is a Short Circuit on the PCB
Desoldering Principles and knowhow during PCBA Processing
Black Oxidation of the Inner Layer of the Multilayer PCB
How to Ensure the High-performance Design of PCB
What Is the Printing Process of SMT Solder Paste?
PCB without fiducial mark, Is There Any Way to do SMT for It
What Are the Benefits of Reserving Break-up Tab for PCB Production
How Does SMT Affect PCB Production Time and Speed It Up
Classification of PCBs from three aspects
Common Problems and Solutions for Dry Film pasting during PCB Manufacturing process
Several Elements to Inspect after PCB Design
What is a halogen-free circuit board?
What Do Capacitive Coupling and Decoupling Mean?
What Are the Differences Between PCB Paste Mask and Solder Mask?
How PCBA Is Packaged and Shipped
How long can PCBA finished products be stored?
What Are the Differences and Relations Between PCB, PCBA, and SMT?
PCB Baking Specifications
PCB "Solder Mask Tenting" and "Solder Mask Opening"
Five reasons for PCB deformation and six solutions
Importance of first article inspection of PCBA board
Temperature zone standard for SMT reflow soldering
Small and medium volume PCB manufacturers in China
The main reason for PCBA cleaning
For power filter, the more capacitors, the better?
What does PCBA programming mean?
Content of PCB incoming testing
What conditions must be met for PCB circuit board soldering?
What is Blind via and Buried via
PCBA Manufacturers Temperature and Humidity Sensitive Components Management
Why choose Shenzhen SMT processing factory?
How long does it take to calculate the quotation for PCBA manufacturing?
Introduction of PCB design clearance requirements
Explanation of BOM, DIP, SMT, SMD
Introduction of the process of PCBA prototype
How to prevent pseudo soldering or cold soldering defects in PCBA manufacturing?

Skills of using 0ohm resistor in PCB design

Zero-ohm resistor is also called a jumper resistor. It is a special-purpose resistor. A 0-ohm resistor does not have a real resistance value of zero. A 0-ohm resistor is actually a resistor with a small resistance value.

In the circuit board design, when two points cannot be connected by circuits. They are often connected by jumpers. This is often seen in ordinary boards. In order to make the automatic placement machine and automatic plug-in machine work normally, zero ohm resistor is used to replace the jumper.

The summary of the functions of zero ohm resistor can include the following:
1. There is no function in the circuit, just for debugging convenience or compatible design on the PCB.

2. Can be used as a jumper to avoid high-frequency interference caused by jumpers (becoming an antenna)

3. When the circuit parameters are uncertain, replace it with 0 ohms. In actual debugging, determine the parameters and replace them with specific components.

4. 0 ohm resistor is actually a resistor with a very small resistor value. When you want to measure the current consumption of a certain part of the circuit, connect a 0 ohm resistor with an ammeter, so that it is convenient to measure the current consumption and can be used to measure large currents.

5. When PCB layout, if it is really not feasible use a line to cross, you can also add a 0 ohm resistor to cross.

6. Under high frequency signals, it acts as an inductor or a capacitor. (Related to external circuit characteristics) Inductance is mainly used to solve EMC problems. Such as between ground and ground, power supply and IC Pin.

7. Single-point grounding (protective grounding, working grounding, and DC grounding are separated from each other on the equipment, and each becomes an independent system.)

8. Configure the circuit, engineers do not want jumpers and DIP switches on products. Sometimes users will change the settings randomly, which is easy to cause error on PCB. In order to reduce maintenance costs, 0 ohm resistors are used instead of jumpers to be soldered on the board.

9. For circuit protection, it acts as a low-cost fuse. Due to the large fusing current of the line on the PCB, it is difficult to fuse if a short-circuit or over-current fault occurs. It may cause bigger accidents.

Since 0 ohm resistor overload current is relatively small (in fact, 0 ohm resistor also has a certain resistor, but it is very small), the 0 ohm resistor is first fused when overcurrent, thereby disconnecting the circuit and preventing greater accidents happened. Sometimes small resistors with a resistor value of a few tenths or a few ohms are used as fuses. However, this is not recommended, but some manufacturers just use it in order to save costs.

In mixed circuits such as digital and analog, the two grounds are often required to be separated and connected at a single point. We can use a 0 ohm resistor to connect the two grounds instead of directly connecting them together. The advantage of this is that the ground wire is divided into two networks, which is much more convenient when add large areas of copper. Incidentally, in such cases, inductors or magnetic beads are sometimes used for connection.


How much current can a zero-ohm resistor withstand? Zero-ohm resistors are often used in circuit design. Generally, the rated power of the resistor is selected according to the current. So which package is the appropriate for 0 ohm?

The actual resistor value of a general 0 ohm resistor is about +-5% deviation, about 50 milliohms. So based on the rated power, you can calculate its rated current.

0402 1/16W: 1/16=I*I*0.05 i.e. I=1.118A;

0603 1/8W: 1/8=I*I*0.05 i.e. I=1.58A;

0805 1/4W: 1/4=I*I*0.05 ie I=2.236A;

For each package, how much current the 0 ohm resistor can pass through is also determined according to the heat dissipation of the resistor on the PCB board.

The relationship between the current and the voltage across the resistor under three packages of 0603, 0805, and 1206 are tested below. It can be seen that the voltage of the three packages begins to rise rapidly after the current actually exceeds 6A.

This shows that the temperature of the resistor has also increased sharply, leading to a significant increase in power consumption. The resistor of 0603 burned when the current increased to 11.5A, the resistor of 0805 burned when the current increased to 12A, and the resistor of 1206 was not burned when the current was 12A.


Current and voltage curve of 0603 package 0 ohm resistance



Current and voltage curve of 0805 package 0 ohm resistance


Current and voltage curve of 1206 package 0 ohm resistance