Whats the Difference Between 4h and 4l

4H and 4L: What’s the Difference?

4H and 4L are two abbreviations commonly used in reference to the four-wheel drive system of a vehicle. While the two terms are often used interchangeably, there are some important distinctions between 4H and 4L that all drivers should be aware of.


The abbreviation 4H stands for four-wheel drive, high range. This mode is typically used when a vehicle is driving on a paved surface, such as a street or highway, and the driver wants to get the most efficient fuel economy and performance out of the vehicle. On the other hand, 4L stands for four-wheel drive, low range. This mode is used when a vehicle is driving on an unpaved surface, such as dirt or gravel, and the driver needs more torque and traction to navigate the terrain.


The primary difference between 4H and 4L is the engine speed. When a vehicle is in 4H, the engine speed is higher and the transmission shifts more quickly. This is beneficial for highway driving because it increases the vehicle’s fuel efficiency and performance. When a vehicle is in 4L, the engine speed is lower and the transmission shifts more slowly. This is beneficial for off-road driving because it provides extra torque and traction.


Safety is one of the most important considerations when driving in any conditions. When driving on a paved surface, 4H should be used to provide better fuel economy and performance. However, when driving on an unpaved surface, 4L should be used to increase traction and torque. It is important to note that 4L should be used only in extreme conditions, as using it on a paved surface can cause damage to the vehicle.

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In conclusion, 4H and 4L are two different modes used in a four-wheel drive system. 4H is used when driving on a paved surface and increases fuel efficiency and performance. 4L is used when driving on an unpaved surface and increases torque and traction. It is important to understand the differences between 4H and 4L in order to ensure safe and efficient driving in any conditions.

Difference in Substrate

The most obvious difference between 4H and 4L is the substrate they are made from. 4H refers to polycrystalline silicon, which is made from a single crystal of silicon, cut into small pieces and then fused together. 4L, on the other hand, is made from polycrystalline polysilicon, which is made from multiple crystals of silicon, all fused together. This difference in substrate has a number of implications for the performance of the two types of transistors.

Difference in Performance

The difference in substrate between 4H and 4L transistors has a significant impact on their performance. 4H transistors are capable of achieving higher switching speeds and higher drain current than 4L transistors, making them better suited for use in high-speed, high-power applications. 4H transistors also have a higher breakdown voltage than 4L transistors, meaning they can handle higher voltages without breaking down.

However, 4L transistors have a number of advantages over 4H transistors. They are more reliable and have a longer lifespan, making them better suited to applications where reliability and longevity are important. 4L transistors also have a lower threshold voltage than 4H transistors, meaning they can be switched on with lower voltages.

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Cost Difference

The difference in substrate also has an impact on the cost of the two types of transistors. 4H transistors are generally more expensive than 4L transistors, as they require more complex manufacturing processes and higher quality materials. As such, 4H transistors are typically used in high-end applications, where their higher performance and higher cost are worth the trade-off. 4L transistors, on the other hand, are often used in lower-end applications, where their lower cost is more important than their higher performance.

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