on November 14th 86

Guide to Using the 1N4448 Diode in Electronic Circuits

The 1N4448 diode is a high-speed switching component known for its efficient performance in electronics that need quick and reliable switching. This article will explore the 1N4448’s features, applications, specifications, and how it compares with similar diodes like the 1N4148, offering insights into its versatile uses across various circuits.

Catalog

Introduction to 1N4448

The 1N4448 is a high-speed switching diode known for its reliable performance in electronics that require rapid switching. It is manufactured using planar technology, a method that provides stability and efficiency. Encased in a durable, hermetically sealed leaded glass package (SOD27 or DO-35), the diode is well-protected from environmental factors, which extends its usability across various applications. This makes the 1N4448 a popular choice for circuits that demand swift response times and dependable performance.

1N4448 Pin Configuration

1N4448 CAD Model

1N4448 Symbol

1N4448 Footprint

1N4448 3D Model

1N4448 Specifications

Technical specifications, features, characteristics, and components with comparable specifications of ON Semiconductor 1N4448

Type	Parameter
Lifecycle Status	ACTIVE (Last Updated: 1 day ago)
Factory Lead Time	18 Weeks
Contact Plating	Tin
Mount	Through Hole
Mounting Type	Through Hole
Package / Case	DO-204AH, DO-35, Axial
Number of Pins	2
Supplier Device Package	DO-35
Weight	126.01363mg
Packaging	Bulk
Published	2016
Part Status	Active
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Max Operating Temperature	175°C
Min Operating Temperature	-55°C
Capacitance	2pF
Voltage - Rated DC	100V
Max Power Dissipation	500mW
Current Rating	200mA
Base Part Number	1N4448
Polarity	Standard
Voltage	75V
Element Configuration	Single
Speed	Small Signal =< 200mA (Io), Any Speed
Current	2A
Diode Type	Standard
Current - Reverse Leakage @ Vr	5μA @ 75V
Power Dissipation	500mW
Output Current	200mA
Voltage - Forward (Vf) (Max) @ If	1V @ 100mA
Forward Current	300mA
Operating Temperature - Junction	-65°C~175°C
Max Surge Current	4A
Voltage - DC Reverse (Vr) (Max)	100V
Current - Average Rectified (Io)	200mA
Forward Voltage	1V
Max Reverse Voltage (DC)	100V
Average Rectified Current	200mA
Reverse Recovery Time	4 ns
Peak Reverse Current	5μA
Max Repetitive Reverse Voltage (Vrrm)	100V
Capacitance @ Vr, F	2pF @ 0V 1MHz
Peak Non-Repetitive Surge Current	4A
Max Forward Surge Current (Ifsm)	4A
Recovery Time	4 ns
Max Junction Temperature (Tj)	175°C
Height	1.91mm
Length	4.56mm
Width	1.91mm
REACH SVHC	No SVHC
Radiation Hardening	No
RoHS Status	ROHS3 Compliant
Lead Free	Lead Free

Mechanical Data for 1N4448

Case

The 1N4448 uses a DO-35 (DO-204AH) case, providing a compact and robust design that suits a wide range of circuit layouts.

Weight

This diode is lightweight, approximately 125 mg, making it a suitable choice for small, weight-sensitive applications.

Cathode Band Color

The cathode band is marked with black, giving you an easy visual reference to identify polarity during installation.

Packaging Options

The 1N4448 is available in different packaging options: TR/10K per 13" reel, accommodating 50K per box, and TAP/10K per ammo pack, also supporting 50K per box. This flexibility allows you to select the most convenient option for your production needs.

1N4448 Key Features

Package Type

This diode is available in both DO-35 glass and surface-mount (SMD) packages, providing flexibility depending on the design needs of your circuit. Whether you’re working with traditional through-hole mounts or more compact SMD configurations, the 1N4448 offers versatility.

Diode Type

As a silicon epitaxial fast-switching diode, the 1N4448 is built for speed and efficiency. The epitaxial layer helps it handle rapid voltage changes more smoothly, which enhances its suitability in circuits requiring high-speed switching.

Max Repetitive Reverse Voltage

With a maximum repetitive reverse voltage of 100 volts, this diode can handle significant reverse voltages. This feature makes it effective in protecting sensitive parts of the circuit from voltage that could otherwise disrupt function or cause damage.

Max Average Rectified Current

The 1N4448 has a maximum average rectified current rating of 15A or 150mA, enabling it to handle moderate current loads effectively. This makes it suitable for circuits with continuous current demands, offering stability and reliability.

Max Power Dissipation

Able to dissipate up to 5W of power, the 1N4448 reduces risks of overheating, which is crucial in high-power or continuous-operation circuits. This ability to handle power dissipation extends its life and helps maintain performance over time.

Reverse Voltage

Rated for 75V in reverse voltage, this diode provides additional resilience against reverse bias conditions. This capability can protect components in circuits with fluctuating voltages or environments prone to voltage spikes.

Operating Temperature Range

The 1N4448 operates within a wide temperature range of -65°C to +175°C. This tolerance means it can perform reliably in both low and high-temperature environments, making it a versatile option for various electronic applications, from consumer devices to industrial systems.

Equivalents of 1N4448

• 1N4150

• 1N4151

• 1N4448WS

• 1N914

• 1N916A

1N4448 Applications

High-Speed Switching

With its high-speed switching capability, the 1N4448 can effectively operate in circuits that require quick response times. This is particularly valuable in applications like signal processing and timing circuits where rapid switching can improve performance.

General Switching

The diode’s reliable on/off switching capability also makes it suitable for general switching purposes, allowing you to use it in a variety of circuit designs. Its stable performance ensures consistent operation, making it ideal for systems that need steady switching.

Rectification

The 1N4448 is well-suited for rectification, a process of converting AC to DC, which is a common requirement in power supplies. Its efficient rectification ability provides stable DC output, making it essential for circuits where a steady DC current is needed.

Component Protection

In circuits that require an added layer of protection, the 1N4448 can block sudden voltage spikes, helping to safeguard sensitive components. This feature is especially useful in environments with fluctuating voltage levels, reducing the risk of component failure.

Blocking Unwanted Voltage

The 1N4448 can also effectively block voltage where it’s not needed, which is helpful in circuits that require controlled voltage flow. This blocking capability makes it suitable for applications that need precise voltage control.

Signal Filtering

In signal processing circuits, the 1N4448 can filter unwanted signals, ensuring that only the desired signals are processed. Its ability to filter effectively makes it valuable in communication systems and other electronics where signal clarity is essential for overall performance.

Recommended Uses for 1N4448

The 1N4448 diode is versatile and can be used across a range of applications. Its design allows it to perform well in tasks like converting alternating current (AC) to direct current (DC) and blocking unexpected voltage spikes. These characteristics make it ideal for protecting components from damage and ensuring smooth operation. It’s also commonly used in digital logic circuits, battery chargers, power supplies, and voltage doubling circuits, making it a flexible choice for various electronics setups.

Comparison of 1N4148 and 1N4448

When comparing the 1N4448 and 1N4148, both are built for general-purpose switching, but the 1N4448 can handle a higher current of up to 500mA, whereas the 1N4148 manages around 200mA. Despite the current-handling difference, their forward voltage under load remains nearly identical, both capping at around 1 Volt. The main difference lies in the 1N4448’s increased tolerance for current, which provides an advantage in circuits requiring slightly more robustness. However, both diodes share similar design and fabrication processes, making them close equivalents in many ways.

1N4448 Package Dimensions

Parts with Similar Specifications to 1N4448

The parts on the right have specifications similar to the ON Semiconductor 1N4448

Parameter / Part Number	1N4448	1N4151TR	1N4148TR
Manufacturer	ON Semiconductor	Vishay Semiconductor Diodes..	ON Semiconductor
Mount	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial
Forward Voltage	1 V	1 V	1 V
Average Rectified Current	200 mA	200 mA	200 mA
Current - Average Rectified	200 mA	-	-
Reverse Recovery Time	4 ns	4 ns	4 ns
Recovery Time	4 ns	4 ns	4 ns
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Manufacturer Information for 1N4448

ON Semiconductor, the manufacturer of the 1N4448, is recognized for its innovations in energy-efficient technology. Their products cater to a range of industries, including automotive, communications, computing, and LED lighting, among others. By focusing on efficient power and signal management solutions, ON Semiconductor aims to support designers in creating reliable and cost-effective systems. Their established supply chain and high-quality standards make them a dependable choice for engineers worldwide, ensuring consistency and performance across their product lineup.

Datasheet PDF

1N4448 Datasheet:

1N4448.pdf

1N4151TR Datasheet:

1N4151TR.pdf

1N4148TR Datasheet:

1N4148TR.pdf