0603 SMD Phototransistor

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1.6 x 0.8 x 0.6


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1.6 × 0.8 × 0.6 mm
0603 SMD Phototransistors: Compact Sensing Solutions for Modern Electronics

Introduction to 0603 SMD Phototransistors

0603 SMD phototransistors are small, surface-mount semiconductor devices that are used to detect and convert light into an electrical signal. They are commonly used in a variety of electronic devices, such as cameras, light meters, and optical sensors. These tiny components are essential for the functioning of many modern devices, and understanding how they work can help you make informed decisions when designing or repairing electronic circuits.
0603 SMD Phototransistors
0603 SMD Phototransistors

The Evolution of Phototransistors

Phototransistors, semiconductor devices that change their electrical output in response to light input, have evolved significantly over the years. The 0603 SMD format represents one of the most compact packages available, allowing for the miniaturization of electronic devices without sacrificing functionality.

Understanding 0603 SMD Phototransistors

The term "0603" refers to the dimensions of the phototransistor, measuring approximately 0.06 inches by 0.03 inches. This small form factor is achieved through Surface-Mount Device (SMD) technology, which enables direct mounting onto the surface of printed circuit boards (PCBs).

Key Features and Specifications

0603 SMD phototransistors are known for their quick response time and sensitivity to a wide range of light wavelengths. They typically operate in the infrared spectrum and are used in applications requiring precise light detection, such as in optical switches, encoders, and various types of sensors.

Applications in Electronics

From consumer electronics to industrial automation, 0603 SMD phototransistors are integral in applications that require reliable light sensing. Their compact size makes them perfect for space-constrained designs like wearable technology, mobile devices, and intricate automation systems.
Applications of 0603 SMD Phototransistors
Applications of 0603 SMD Phototransistors

How Do 0603 SMD Phototransistors Work?

Phototransistors are a type of semiconductor device that use light-sensitive materials to detect and amplify light. The 0603 SMD phototransistor is a specific type of phototransistor that is designed to be mounted on a circuit board using surface-mount technology (SMT). This allows for a more compact and efficient design, making it ideal for use in small electronic devices. When light hits the surface of the phototransistor, it causes a flow of electrons within the device. This flow of electrons is then amplified by the transistor, producing a larger electrical signal. The amount of light that hits the phototransistor determines the strength of the electrical signal, allowing it to function as a light sensor.

Advantages of 0603 SMD Phototransistors

One of the main advantages of 0603 SMD phototransistors is their small size. Measuring only 0.6mm by 0.3mm, they are significantly smaller than traditional through-hole phototransistors. This makes them ideal for use in compact electronic devices, where space is limited. Another advantage is their low power consumption. 0603 SMD phototransistors require very little power to operate, making them energy-efficient and cost-effective. This is especially important for battery-powered devices, where every bit of power counts. 0603 SMD phototransistors have a wide range of applications in various industries. They are commonly used in electronic devices that require light sensing capabilities, such as cameras, light meters, and optical sensors. They are also used in automotive applications, such as automatic headlights and rain sensors. In addition, 0603 SMD phototransistors are used in industrial and medical equipment, such as barcode scanners and blood glucose monitors. They are also used in security systems, such as motion detectors and light sensors for automatic doors.

Integration into Modern Devices

Integrating 0603 SMD phototransistors into modern devices requires expertise in PCB design and an understanding of optical sensing. This section will provide insights into design considerations for engineers looking to incorporate these components into their projects.

The Role of Phototransistors in IoT

In the age of the Internet of Things (IoT), 0603 SMD phototransistors play a vital role in enabling smart devices to interact with their environment. They are used in smart home systems, environmental monitoring, and in creating more interactive and responsive gadgets.

Innovations and Future Developments

The technology behind 0603 SMD phototransistors is constantly advancing, with researchers and manufacturers seeking to improve their performance and expand their applications. This part of the article will explore potential future developments in phototransistor technology.

Choosing the Right 0603 SMD Phototransistor

When selecting a 0603 SMD phototransistor for your project, there are a few factors to consider. The most important factor is the wavelength of light that the phototransistor is sensitive to. Different phototransistors are designed to detect different wavelengths of light, so it is important to choose one that is suitable for your specific application. You should also consider the sensitivity and response time of the phototransistor. A more sensitive phototransistor will produce a stronger electrical signal, while a faster response time means the device can detect changes in light more quickly.

The Environmental and Economic Impact

Using 0603 SMD phototransistors can contribute to more sustainable electronic designs due to their low power consumption and long operational life. The economic impact of these components is also significant, as they can reduce the overall cost of electronic devices by minimizing power requirements and maximizing space efficiency.


0603 SMD phototransistors are more than just components; they are enablers of innovation in the electronics industry. Their small size, combined with their high sensitivity and rapid response time, makes them indispensable in the development of advanced, compact electronic devices. Call to Action: Embrace the precision and compactness of 0603 SMD phototransistors in your electronic designs. With their integration, elevate the functionality and efficiency of your devices. Contact a specialist today to find the perfect phototransistor for your next project. Features of 0603 SMD Infrared Diode (Phototransistors LED):
  • Compact 0603 package: 1.6mm x 0.8mm x 0.8mm.
  • Infrared diode for specific applications.
  • Compatibility with automatic placement equipment.
  • Wide viewing angle for versatile visibility.
  • Applications include remote control, wireless data transmission, and security alarms.
  • Package: 4,000 pieces per reel.
  • Rohs Compliance
Possible Applications:
  • Infrared remote control systems.
  • Phototransistor-based wireless data transmission.
  • Security alarm systems.
  • Proximity sensors.
  • Ambient light sensing.
  • Smart home applications.
  • Gesture recognition systems.
  • Object detection.
  • Optical encoders.
  • Communication devices.
  • Industrial automation.
  • Medical equipment.
  • Consumer electronics.
  • Wearable technology.
  • Smart appliances.
  • Automotive applications.
  • Robotics.
  • Customized infrared projects.
Dimension and Circuit Drawing:
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When soldering, leave a minimum of 2mm clearance from the base of the base of the lens to the soldering point. Dipping the lens into the solder must be avoided.

Do not apply any external stress to the lead frame during soldering while the LED is at high temperature.

Recommended soldering conditions:


IR Reflow Soldering (for SMD display)Wave SolderingSoldering Iron
Pre-Heat150-180°CPre-Heat100°C Max.Temperature300°C Max.
Pre-Heat Time120sec Max.Pre-Heat Time60sec Max.
Peak Temperature260°C Max.SolderWave260°C Max.Soldering Time3sec Max.(one time only)
Soldering Time10 sec Max.Soldering Time5sec Max.

Note: Excessive soldering temperature and/or time might result in deformation of the LED lens or failure of the LED

ESD(Electrostatic Discharge)

Static Electricity or power surge will damage the LED.

Suggestions to prevent ESD (Electrostatic Discharge):

n Use a conductive wrist band or anti-electrostatic glove when handling these LEDs

n All devices, equipment, and machinery must be properly grounded

n Work tables, storage racks, etc. should be properly grounded

n Use ion blower to neutralize the static charge which might have built up on surface of the LED’s

 plastic lens as a result of friction between LEDs during storage and handling

ESD-damaged LEDs will exhibit abnormal characteristics such as high reverse leakage current, 

low forward voltage, or “no light on” at low currents. To verify for ESD damage, check for “light on” 

and Vf of the suspect LEDs at low currents.

The Vf of “good” LEDs should be>2.0V@0.1mA for InGaN product and >1.4V@0.1mA for AlInGaP


antistatic notice-smd led

When selecting power for LED systems, it’s essential to understand several key parameters to ensure safe operation, longevity, and optimal performance. Here are some steps and considerations for LED power selection:

  • Determine the Forward Voltage (Vf) of the LED(s):

Each LED has a forward voltage, which is the voltage at which the LED operates when the current is flowing through it. This value can typically be found in the LED’s datasheet.

  • Determine the Forward Current (If) of the LED(s):

The forward current is the current at which the LED is designed to operate. Running an LED at higher than its rated current can reduce its lifespan and increase the heat it produces.

  • Decide on the Configuration:

Series Configuration: When LEDs are connected in series, the forward voltages add up, but the current remains the same.

Parallel Configuration: When LEDs are connected in parallel, the forward voltage remains the same, but the currents add up. This configuration can be risky because if one LED fails or has a slightly lower forward voltage, it can cause the other LEDs to draw more current.

Calculate Total Power Requirements:

Power (W) = Total Forward Voltage (V) x Total Forward Current (A)

For example, if you have three LEDs connected in series, each with a forward voltage of 3V and a forward current of 20mA, the total power requirement would be:

Power = (3V + 3V + 3V) x 20mA = 9V x 0.02A = 0.18W

  • Select an Appropriate Power Supply:
  • Voltage Rating: The power supply voltage should match or slightly exceed the total forward voltage of your LED configuration.
  • Current Rating: The power supply’s current rating should meet or exceed the total forward current of your LED configuration.
  • Safety Margin: It’s a good practice to select a power supply that can provide at least 20% more power than your calculated requirement. This ensures the power supply isn’t operating at its maximum capacity, which can extend its life and ensure safer operation.
  • Consider Additional Features:
  • Dimming Capability: If you want to control the brightness of your LEDs, choose a power supply with dimming capabilities.
  • Overcurrent and Overvoltage Protection: To protect your LEDs, select a power supply with built-in protection mechanisms.
  • Thermal Management: Ensure that the power supply has adequate cooling, especially if it will be enclosed or in a location with limited airflow.
  • Regulation and Efficiency:A power supply with good regulation will maintain a consistent voltage output despite variations in the load. High efficiency ensures minimal power is wasted as heat.
  • Physical Size and Form Factor:Depending on where you plan to place the power supply, its size and shape may be critical factors.

In summary, when selecting power for LED systems, understanding your LED’s requirements and the configuration you plan to use is essential. Then, pick a power supply that meets those needs with some added safety margin, keeping in mind any additional features or constraints relevant to your project.

Here are some well-regarded brands in the industry:

  • Mean Well: One of the most recognized brands in the LED power supply industry, Mean Well offers a wide range of products suitable for both indoor and outdoor applications. Their units often come with features like overcurrent protection, dimming capabilities, and high efficiency.
  • Tridonic: A global leader in lighting technology, Tridonic offers LED drivers and power supplies that cater to various lighting solutions, from simple setups to advanced smart lighting systems.
  • Philips Advance Xitanium: Philips is a well-known brand in the lighting industry, and their Xitanium series of LED drivers are known for reliability and performance. They cater to both indoor and outdoor LED applications.
  • Osram: Another giant in the lighting industry, Osram offers a range of LED drivers and power supplies suitable for various applications, including architectural and street lighting.
  • LIFUD: Specializing in LED drivers, LIFUD is known for its high-quality products that cater to both commercial and residential LED lighting solutions.
  • MOSO: This brand offers a variety of LED drivers, especially for outdoor and industrial applications. Their products are known for durability and performance.
  • TDK-Lambda: With a history in power electronics, TDK-Lambda offers a range of power supplies and LED drivers suitable for various applications, emphasizing reliability and advanced features.
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