BSS138: Introduction And Special Models

The BSS138 MOSFET is a versatile component extensively used in low voltage and low current applications. This article aims to provide an in-depth introduction to the BSS138, highlighting its features, functionality, and applications. Additionally, we will explore special models.

What is BSS138?

BSS138 is a small signal N-channel MOSFET widely used in various low voltage and low current applications. Its compact size, low on-resistance, and fast switching characteristics make it suitable for battery-powered devices, level shifting circuits, audio amplifiers, and other projects where space and power efficiency are crucial.

What is the BSS138 specification?

Type	Description
Category	Discrete Semiconductor Products Transistors FETs, MOSFETs Single FETs, MOSFETs
Package	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®
Product Status	Active
FET Type	N-Channel
Technology	MOSFET (Metal Oxide)
Drain to Source Voltage (Vdss)	50 V
Current – Continuous Drain (Id) @ 25°C	220mA (Ta)
Drive Voltage (Max Rds On, Min Rds On)	4.5V, 10V
Rds On (Max) @ Id, Vgs	3Ohm @ 500mA, 10V
Vgs(th) (Max) @ Id	1.6V @ 250µA
Gate Charge (Qg) (Max) @ Vgs	2.4 nC @ 10 V
Vgs (Max)	±20V
Input Capacitance (Ciss) (Max) @ Vds	27 pF @ 25 V
Power Dissipation (Max)	350mW (Ta)
Operating Temperature	150°C (TJ)
Mounting Type	Surface Mount
Supplier Device Package	SOT-23
Package / Case	SOT-23
Base Product Number	BSS138

What is the function of BSS138?

The primary function of BSS138 is to control and switch small electrical signals in electronic circuits. As a MOSFET, it operates as a voltage-controlled switch, allowing or blocking the flow of current based on the voltage applied to its gate terminal. It can be used for tasks such as level shifting, signal amplification, and as a general-purpose switch.

What is the equivalent of BSS138?

While there might not be an exact equivalent of BSS138, there are several similar N-channel MOSFETs available that can be used as alternatives. Some common alternatives include 2N7002, BS170, and IRF5305. However, it is important to consider the specific requirements of the circuit and ensure compatibility with voltage, current, and other parameters when selecting an alternative.

How accurate is BSS138?

The accuracy of BSS138 depends on its intended use. As a MOSFET, it does not inherently provide any accuracy in terms of voltage or current measurement. However, it is known for its reliable switching characteristics within its specified voltage and current ratings. To achieve accurate results in a circuit, it is crucial to consider the overall system design, external components, and proper calibration if needed.

How price is BSS138?

Quantity	Price
1+	$0.40
10+	$0.293
100+	$0.166
250+	$0.11
500+	$0.085
1000+	$0.39

Feature

• Low voltage operation: It can operate at low voltages, typically around 20V or lower.
• Low on-resistance: The MOSFET has a low resistance when turned on, minimizing power loss and voltage drop across the device.
• Fast switching speed: BSS138 offers quick response times when transitioning between the on and off states.
• Small package: It is available in compact packages such as SOT-23, making it suitable for space-constrained designs.
• Logic-level compatible: The gate voltage required for switching is compatible with standard logic-level signals, making it easy to interface with microcontrollers or other digital components.
• ESD protection: BSS138 provides built-in electrostatic discharge (ESD) protection, enhancing its reliability and robustness against static electricity.

How to use BSS138?

To use BSS138 in a circuit, follow these general steps:

1. Identify the appropriate pin configuration of the BSS138 package (commonly SOT-23 or similar).
2. Connect the drain pin to the load or component you want to control or switch.
3. Connect the source pin to the ground (0V) or the common reference point of your circuit.
4. Apply a suitable voltage to the gate pin to control the switching action. The gate voltage must be within the specified range provided in the datasheet, considering threshold voltage and maximum ratings.
5. Ensure that the drain current and voltage do not exceed the specified limits to prevent damage to the MOSFET.

One Model: BSS138N

Introduction

The BSS138N is a small signal N-channel MOSFET designed for low voltage and low current applications. It is widely used in various electronic circuits due to its reliable switching characteristics and compact size.

One of the key advantages of the BSS138N is its low voltage operation capability. It can handle voltages as low as 1.8V, making it suitable for battery-powered devices and other low voltage applications. Additionally, this MOSFET offers a low on-resistance, which ensures minimal power loss during conduction.

Pcb symbol and Footprint

Datasheet

You can check BSS138N Datasheet now so that you can know more useful information!

One Model: BSS138LT1G

Introduction

The BSS138LT1G is a specific variant of the BSS138 MOSFET that offers additional features compared to the standard model. This variant incorporates built-in electrostatic discharge (ESD) protection, safeguarding the MOSFET against potential damage from static electricity.

The BSS138LT1G shares the same characteristics as the BSS138N, including its low voltage operation, low on-resistance, fast switching speed, and small package size. However, the added ESD protection enhances its reliability and durability, making it an excellent choice for applications requiring robust performance.

Pcb symbol and Footprint

Datasheet

You can check BSS138LT1G Datasheet now so that you can know more useful information!

Conclusion

In conclusion, the BSS138 MOSFET is a reliable and efficient device widely employed in various electronic circuits. Its low voltage operation, low on-resistance, and fast switching speed make it an excellent choice for low power applications. Whether you are designing battery-powered devices or space-constrained applications, the BSS138 series, including the BSS138N and BSS138LT1G, offer exceptional performance and versatility.