BSS138 -7-F Detailed explanation of pin function specifications and circuit principle instructions

The BSS138-7-F is a component from Vishay, which is a well-known manufacturer in the field of electronic components, particularly for semiconductors. It is a MOSFET transistor (N-channel), typically used in low-voltage applications. Below, I'll explain its packaging, pin functions, circuit principle, and provide a comprehensive FAQ related to this component. Given your request for a detailed explanation, I will outline the pin functions, FAQ, and the related content in a structured way. Please note that the component in question has only three pins, not 200 pins, so the detailed function of each pin will be described accordingly.

BSS138-7-F Pinout and Package

The BSS138-7-F is packaged in a SOT-23 surface-mount package, which is common for small signal transistors. It features 3 pins. Below is the detailed pinout and explanation of the function for each pin:

Pin Number Pin Name Pin Function 1 Drain (D) This pin connects to the drain terminal of the N-channel MOSFET. It typically connects to the load in the circuit. The voltage at the drain is dependent on the voltage applied to the gate (V_GS). 2 Source (S) This pin is connected to the source terminal of the MOSFET. In most circuit designs, the source is usually tied to ground or a reference voltage. 3 Gate (G) The gate controls the conductivity between the drain and source. When a voltage (VGS) above the threshold voltage (VGS(th)) is applied to the gate, it allows current to flow from drain to source. When the gate voltage is below the threshold, the MOSFET remains off.

Circuit Principle of BSS138-7-F

The BSS138-7-F is a N-channel MOSFET, meaning it conducts when a positive voltage is applied to the gate relative to the source. It is typically used as a switching device in low-power applications, such as signal routing, level shifting, or in power management circuits.

Gate Drive: The voltage between the gate (G) and source (S) controls whether the MOSFET is on or off. A positive gate-source voltage (V_GS) turns it on, allowing current to flow from drain to source. Drain Current: The amount of current that flows from drain (D) to source (S) is controlled by the gate voltage. The MOSFET can be in three states: Cut-off: No current flows when VGS < VGS(th) (threshold voltage). Linear /Ohmic: When V_GS is slightly above the threshold, the MOSFET is partially conducting. Saturation/Active: When VGS is significantly higher than VGS(th), the MOSFET fully conducts, allowing the maximum current.

FAQ (Frequently Asked Questions)

What is the part number of this MOSFET? The part number is BSS138-7-F. What type of component is the BSS138-7-F? The BSS138-7-F is an N-channel MOSFET. What is the package type for BSS138-7-F? The BSS138-7-F is in a SOT-23 package. How many pins does the BSS138-7-F have? The BSS138-7-F has 3 pins. What is the drain current rating for the BSS138-7-F? The BSS138-7-F can handle a drain current of up to 220 mA. What is the maximum V_DS for BSS138-7-F? The maximum V_DS (drain-to-source voltage) is 50V. What is the threshold voltage (V_GS(th)) of BSS138-7-F? The V_GS(th) for the BSS138-7-F is typically between 1.3V to 3.5V. What is the gate capacitance of the BSS138-7-F? The gate capacitance (CGS) is typically 10 pF at VDS = 25V. What is the source terminal connected to in most circuits? The source (S) is typically connected to ground in most applications.

What is the drain current limit for the BSS138-7-F?

The maximum drain current (I_D) is 220 mA.

How does the BSS138-7-F switch?

The gate (G) controls the switch. A positive voltage between gate and source turns the MOSFET on, while zero or negative voltage keeps it off.

Is the BSS138-7-F suitable for use in high-power circuits?

No, the BSS138-7-F is designed for low-power applications, with a maximum VDS of 50V and ID of 220mA.

Can the BSS138-7-F be used for signal-level shifting?

Yes, the BSS138-7-F is often used in level shifting applications due to its low threshold voltage.

What is the maximum gate voltage for the BSS138-7-F?

The maximum V_GS (gate-to-source voltage) is ±20V.

What is the typical application of the BSS138-7-F?

The BSS138-7-F is typically used for switching applications like logic-level translation, low-side switching, or power management.

What is the gate-to-source threshold voltage (V_GS(th)) range?

The V_GS(th) range is from 1.3V to 3.5V.

What is the RDS(on) for BSS138-7-F at VGS = 10V?

The RDS(on) at VGS = 10V is typically 100 mΩ.

Can the BSS138-7-F be used in automotive applications?

The BSS138-7-F can be used in automotive applications as long as the operating conditions (voltage and current) are within the rated limits.

What is the maximum junction temperature of the BSS138-7-F?

The maximum junction temperature (T_j) is 150°C.

Can the BSS138-7-F be used for high-speed switching?

Yes, the BSS138-7-F can be used for high-speed switching in circuits with low power consumption.

This summary covers all the key aspects of the BSS138-7-F including the package details, pin functions, and common FAQ. The component is typically used in low-power applications, offering efficient switching performance. If you need more detailed technical data or specifications, such as datasheets, those can be found from the manufacturer's documentation.

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