Home Blog~~Exploring BSS138LT1G Power Management for Portable Devices~~

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Exploring BSS138LT1G Power Management for Portable Devices

The BSS138LT1G is a small and efficient N-channel Power MOSFET that helps manage power in devices using low voltages. You’ll often find it in devices like computers, printers, and cell phones. It’s especially good at working with low voltage levels, which makes it perfect for portable and battery-powered electronics. Its compact design allows it to fit easily on circuit boards, making it great for modern devices where space is tight. This article will walk you through its features, applications, and technical details, helping you understand how this MOSFET can be useful for your projects.

Catalog

1. Overview of BSS138LT1G

2. BSS138LT1G Pin Configuration

3. BSS138LT1G CAD Design

4. Key Features of BSS138LT1G

5. BSS138LT1G Specifications Overview

6. BSS138LT1G Comparable Parts

7. BSS138LT1G Applications

8. BSS138LT1G Packaging Information

9. About the Manufacturer: ON Semiconductor

Overview of BSS138LT1G

The BSS138LT1G is an N-channel Power MOSFET designed for power management in devices that rely on low voltages. It’s often used in applications like DC-to-DC converters found in computers, printers, and mobile devices such as cell phones and cordless phones. What sets this MOSFET apart is its ability to operate efficiently at lower voltage levels, which makes it a great fit for portable and battery-powered devices. The compact SOT−23 surface-mount package allows it to fit easily on circuit boards, which is helpful in space-constrained designs. This makes it well-suited for modern electronics where power efficiency and size matter.

BSS138LT1G Pin Configuration

BSS138LT1G CAD Design

BSS138LT1G Symbol

BSS138LT1G Footprint

BSS138LT1G 3D Model

Key Features of BSS138LT1G

Low Threshold Voltage

The BSS138LT1G operates with a low threshold voltage, ranging from 0.5V to 1.5V. This means it can turn on and function efficiently in low-power conditions, making it a good fit for devices that don’t require a lot of energy to operate.

Compact SOT-23 Surface-Mount Package

Its small SOT-23 surface-mount package helps save space on the circuit board. This compact size is helpful when designing modern electronic devices where space is often limited, ensuring everything fits neatly without taking up too much room.

Automotive-Grade Qualification (AEC-Q101)

The BSS138LT1G is AEC-Q101 qualified, meaning it’s built for reliable use in automotive and other demanding applications. It can handle tough environments where long-term durability is needed for smooth operation.

RoHS and Environmentally Friendly Compliance

The BSS138LT1G meets RoHS standards, which restricts the use of certain hazardous materials. It’s also PB-free and halogen-free, making it an environmentally friendly choice, aligning with eco-conscious manufacturing efforts.

BSS138LT1G Specifications Overview

Technical specifications, attributes, parameters, and comparable parts related to the ON Semiconductor BSS138LT1G.

Type	Parameter
Lifecycle Status	ACTIVE (Last Updated: 3 days ago)
Factory Lead Time	14 Weeks
Contact Plating	Tin
Mounting Type	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3
Surface Mount	YES
Number of Pins	3
Transistor Element Material	SILICON
Current - Continuous Drain (Id) @ 25℃	200mA Ta
Drive Voltage (Max Rds On, Min Rds On)	5V
Number of Elements	1
Power Dissipation (Max)	225mW Ta
Turn Off Delay Time	20 ns
Operating Temperature	-55°C ~ 150°C TJ
Packaging	Cut Tape (CT)
Published	2005
JESD-609 Code	e3
Pbfree Code	yes
Part Status	Active
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Number of Terminations	3
ECCN Code	EAR99
Resistance	3.5 Ohm
Voltage - Rated DC	50V
Terminal Position	DUAL
Terminal Form	GULL WING
Peak Reflow Temperature (Cel)	260°C
Current Rating	200mA
Time @ Peak Reflow Temperature (Max)	40s
Pin Count	3
Element Configuration	Single
Operating Mode	ENHANCEMENT MODE
Power Dissipation	225mW
Turn On Delay Time	20 ns
FET Type	N-Channel
Transistor Application	SWITCHING
Rds On (Max) @ Id, Vgs	3.5 Ω @ 200mA, 5V
Vgs(th) (Max) @ Id	1.5V @ 1mA
Halogen Free	Halogen Free
Input Capacitance (Ciss) (Max) @ Vds	50pF @ 25V
Vgs (Max)	±20V
Continuous Drain Current (ID)	200mA
Threshold Voltage	1.5V
Gate to Source Voltage (Vgs)	20V
Drain Current-Max (Abs) (ID)	0.2A
Drain to Source Breakdown Voltage	50V
Nominal Vgs	1.5V
Feedback Cap-Max (Crss)	5pF
Height	1.01mm
Length	3.04mm
Width	1.4mm
REACH SVHC	No SVHC
Radiation Hardening	No
RoHS Status	ROHS3 Compliant

BSS138LT1G Comparable Parts

Part Number	Description	Manufacturer
BSS138L9Z	220mA, 50V, N-CHANNEL, Si, SMALL SIGNAL, MOSFET, TO-236AB	Texas Instruments
BSS138-7-F	Small Signal Field-Effect Transistor, 0.2A (ID), 50V, 1-Element, N-Channel, Silicon, Metal-oxide Semiconductor FET, PLASTIC PACKAGE-3	SPC Multicomp
UBSS138TA	Small Signal Field-Effect Transistor, 0.2A (ID), 50V, 1-Element, N-Channel, Silicon, Metal-oxide Semiconductor FET, SOT-23, 3 PIN	Zetex / Diodes Inc
BSS138T/R13	Small Signal Field-Effect Transistor, 0.3A (ID), 50V, 1-Element, N-Channel, Silicon, Metal-oxide Semiconductor FET, ROHS COMPLIANT PACKAGE-3	PanJit Semiconductor
BSS138NL6327	Small Signal Field-Effect Transistor, 0.23A (ID), 60V, 1-Element, N-Channel, Silicon, Metal-oxide Semiconductor FET, ROHS COMPLIANT, PLASTIC PACKAGE-3	Infineon Technologies AG
BSS138E6327	Small Signal Field-Effect Transistor, 0.23A (ID), 50V, 1-Element, N-Channel, Silicon, Metal-oxide Semiconductor FET, SOT-23, 3 PIN	Infineon Technologies AG
BSS138-TP	Small Signal Field-Effect Transistor, 0.22A (ID), 50V, 1-Element, N-Channel, Silicon, Metal-oxide Semiconductor FET	Micro Commercial Components
BSS138NH6433	Small Signal Field-Effect Transistor, 0.23A (ID), 50V, 1-Element, N-Channel, Silicon, Metal-oxide Semiconductor FET, GREEN, PLASTIC PACKAGE-3	Infineon Technologies AG
BSS138NH6433	Small Signal Field-Effect Transistor, 0.23A (ID), 50V, 1-Element, N-Channel, Silicon, Metal-oxide Semiconductor FET, SOT-23, 3 PIN	Infineon Technologies AG
UBSS138	Small Signal Field-Effect Transistor, 0.2A (ID), 50V, 1-Element, N-Channel, Silicon, Metal-oxide Semiconductor FET, SOT-23, 3 PIN	Diodes Incorporated

BSS138LT1G Comparable Parts

DC-DC Converters

This MOSFET is often used in DC-DC converters, which help manage voltage changes in devices like computers and mobile electronics. It ensures the right voltage levels are provided to various components, helping the device run efficiently.

Printers

The BSS138LT1G is used in printers to manage power distribution, ensuring components get the correct amount of power while preventing energy waste and overheating. This helps keep printers running smoothly over time.

PCMCIA Cards

In PCMCIA cards, the BSS138LT1G helps control the power usage. These cards are used to add functions to laptops and other devices, and this MOSFET supports their efficient operation, helping them work effectively without using too much energy.

Battery-Powered Devices

The BSS138LT1G is often found in devices powered by batteries, such as computers, cell phones, and cordless phones. It helps manage power consumption, ensuring that the device runs efficiently and extends battery life, allowing longer use between charges.

BSS138LT1G Packaging Information

BSS138LT1G Package Outline

BSS138LT1G Mechanical Data

DIM	Millimeters (MIN)	Millimeters (NOM)	Millimeters (MAX)	Inches (MIN)	Inches (NOM)	Inches (MAX)
A	0.89	1	1.11	0.035	0.039	0.044
A1	0.01	0.06	0.1	0	0.002	0.004
b	0.37	0.44	0.5	0.015	0.017	0.02
c	0.08	0.14	0.2	0.003	0.006	0.008
D	2.8	2.9	3.04	0.11	0.114	0.12
E	1.2	1.3	1.4	0.047	0.051	0.055
E1	2.9	3	3.1	0.114	0.118	0.122
L	1.78	1.9	2.04	0.07	0.075	0.08
L1	0.35	0.54	0.69	0.014	0.021	0.027
H_E	2.1	2.4	2.64	0.083	0.094	0.104
T	0°	----	10°	0°	----	10°

BSS138LT1G Recommended Soldering Footprint

About the Manufacturer: ON Semiconductor

ON Semiconductor is known for developing products that help companies reduce energy use across a range of industries. They provide power management and signal solutions that can be found in areas such as automotive, communications, consumer electronics, and LED lighting. ON Semiconductor supports engineers and designers by offering a wide variety of products that help solve specific design challenges in these fields. With a presence in major markets worldwide, they maintain a strong supply chain and provide reliable customer service. Their manufacturing facilities and design centers are strategically located to ensure they can meet the needs of customers globally, while continuing to drive innovations in energy-saving technologies.

Datasheet PDF

BSS138LT1G Datasheets:

BSS138LT1G.pdf

BSS138-TP Datasheets:

BSS138-TP.pdf

Frequently Asked Questions [FAQ]

1. What is the BSS138LT1G used for?

The BSS138LT1G is an N-channel Power MOSFET commonly used in DC-to-DC converters and power management systems in devices like computers, printers, PCMCIA cards, as well as cellular and cordless phones.

2. What is the threshold voltage range for the BSS138LT1G?

The BSS138LT1G has a threshold voltage range of 0.5V to 1.5V, making it well-suited for low-power applications.

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