BPW34 Photodiode: Datasheet, Pinout, and Alternative

The BPW34 photodiode is one of the most widely used light sensors in modern electronics. Designed as a high-speed PIN photodiode with excellent radiant sensitivity, it efficiently detects both visible and near-infrared light. Its compact, clear plastic top-view package makes it ideal for a variety of applications, from industrial automation and optical communication to consumer electronics and educational projects. Whether you are measuring light intensity, building high-speed optical circuits, or creating reflective sensors, the BPW34 offers reliable performance, fast response, and ease of integration. In this guide, we will explore its specifications, pinout, features, applications, alternatives, and frequently asked questions to help you make the most of this versatile photodiode.

1. What is BPW34 Photodiode?

2. BPW34 Pinout

3. BPW34 Photodiodes Specifications

4. BPW34 Circuit Features

5. BPW34 Applications and Use Cases

6. BPW34 Alternative and Equivalent Photodiodes

7. Frequently Asked Questions [FAQ]

What is BPW34 Photodiode?

The BPW34 is a widely used silicon PIN photodiode designed for accurate and high-speed detection of light. It is known for its high radiant sensitivity, fast response time, and stable performance across a broad range of optical applications. The device comes in a compact, flat, top-view clear plastic package, which allows maximum light exposure to its photosensitive surface.

The BPW 34 is sensitive to both visible light and near-infrared (NIR) radiation, typically covering a wavelength range from about 400 nm to 1100 nm, with peak sensitivity around 900 nm. This makes it suitable for applications involving infrared detection, light measurement, and optical communication systems.

Structurally, the PIN configuration (P-type, Intrinsic, N-type layers) provides low capacitance and fast switching speed, enabling it to respond quickly to changing light signals. The photodiode can operate in two modes: photovoltaic mode (zero bias), which offers low noise and good stability, and photoconductive mode (reverse bias), which provides faster response and higher sensitivity.

Because its reliability, compact size, and versatility, the circuit commonly used in industrial automation, consumer electronics, medical devices, and experimental optical systems, making it a popular choice for engineers, students, and hobbyists alike.

BPW34 Pinout

The component has a simple 2-pin configuration, making it easy to integrate into circuits.

Pin Configuration

BPW34 CAD Model

BPW34 Symbol

BPW34 Photodiodes Specifications

Here are the key technical details:

Package of BPW34:

This compact DIP package also features a top-view clear epoxy window, allowing efficient light exposure to the photodiode’s active area.

Manufacturer Information

The photodiode produce by reputable semiconductor manufacturers known for highquality optoelectronic components:

Vishay Semiconductors – A global leader in discrete semiconductors and passive components, Vishay offers the BPW 34 with consistent performance and wide availability through electronic distributors worldwide.

OSRAM Opto Semiconductors – A trusted provider of optical and infrared sensing products, OSRAM manufactures BPW 34 photodiodes that meet strict quality and reliability standards for industrial and consumer applications.

Both manufacturers ensure that the component is compatible with standard electronic designs and provide datasheets detailing electrical, optical, and mechanical specifications. Their versions of the BPW 34 widely use in light detection, automation, sensing, and communication systems because stable characteristics and longterm supply support.

These manufacturer offerings make the component a dependable choice for engineers, designers, and hobbyists working on projects ranging from precision measurement instruments to highspeed optical detection circuits. Both manufacturers provide high-quality, industry-standard versions of the BPW 34.

BPW34 Circuit Features

Designed with several practical features that make it suitable for demanding applications:

Package: Epoxy, diffuse plastic housing provides stable light transmission and environmental protection. The top-view clear window ensures maximum exposure to the active area, improving detection efficiency in compact designs.

Corrosion Robustness: Rated Class 3B, offering strong resistance against humidity and environmental stress, making it suitable for industrial and outdoor sensing applications.

ESD Protection: Withstands up to 2 kV (HBM, Class 2) based on ANSI/ESDA/JEDEC JS-001, helping prevent damage from electrostatic discharge during handling and assembly.

Spectral Suitability: Optimized for 400 nm to 1100 nm, enabling reliable detection across visible and near-infrared wavelengths, ideal for IR sensing and optical measurement systems.

Switching Speed: Provides a fast switching time (typ. 20 ns), supporting high-speed signal detection in optical communication and pulse measurement circuits.

Low Capacitance: Designed with low junction capacitance, which enhances response speed and improves performance in high-frequency applications.

Package Structure: Features a DIL plastic package that allows high PCB packing density while maintaining good mechanical stability and ease of soldering in through-hole designs.

These features make the BPW 34 reliable in both consumer and industrial designs.

BPW34 Applications and Use Cases

The BPW 34 is used across a wide range of industries because its speed and sensitivity.

Electronic Equipment: Widely used in consumer and professional electronic devices such as light meters, camera exposure systems, IR receivers, and automatic lighting controls. Its high sensitivity and stable response make it suitable for accurate light detection and measurement in compact circuits.

Industrial Automation: Commonly applied in machine control systems, light barriers, and vision control applications. It helps detect object presence, count items on production lines, and monitor movement, improving efficiency, safety, and precision in automated environments.

High-Speed Photo Detection: Ideal for high-speed photodetector applications such as optical communication systems, pulse signal detection, and data transmission. Its fast switching time enables it to capture rapidly changing light signals with minimal delay.

Optical Sensing Systems: Used in infrared sensing, proximity detection, reflective sensors, and light interruption systems. It performs well in applications requiring consistent and reliable detection of visible and near-infrared light.

Measurement and Instrumentation: Suitable for scientific instruments and test equipment, including light intensity meters, radiation detectors, and laboratory optical experiments, where precision and repeatability are important.

DIY and Embedded Projects: Frequently used in Arduino and microcontroller-based projects for light sensing, solar energy monitoring, and optical experiments because its simple interface and availability.

BPW34 Alternative and Equivalent Photodiodes

When the BPW 34 is not available or specific application requirements differ, can use several alternatives and equivalent components to maintain similar performance in optical detection circuits.

Direct Photodiode Alternatives:

BPW82

This is a high-speed photodiode with peak sensitivity at 950 nm, a fast response time of 100 ns, and a wide viewing angle of 130°. It comes in a 2-DIP through-hole package and is ideal for infrared sensing, light barrier systems, and other high-speed optical applications where normally use the BPW34.

BPW17N

A phototransistor with peak sensitivity around 825 nm and a top-view radial package. Unlike a standard photodiode, it provides internal current amplification, which is useful in low-light applications. However, it has a slightly slower response time compared to PIN photodiodes, making it better for moderate-speed detection circuits.

Other Related Components:

Photodiode + LED Modules: These integrated modules combine a light source and photodetector in one assembly. They commonly use in reflective or transmission sensing systems, object detection, and proximity measurement.

Optoisolators (e.g., 6N139, MCT2E): These components pair a photodiode or phototransistor with an LED to provide electrical isolation between input and output circuits. For example, the MCT2E features a base-output transistor, 5300 Vrms isolation, and a 1-channel 6-DIP package, making it suitable for high-voltage interfacing, signal isolation, and protection in sensitive electronics.

These alternatives ensure flexibility for designers, enabling them to select components based on wavelength, speed, package type, and circuit requirements while achieving reliable optical detection performance.

BPW34 Photodiode Datasheet

You can refer to the official datasheet for detailed electrical characteristics, graphs, and design guidelines. The datasheet includes:

· Spectral sensitivity curves

· Reverse voltage characteristics

· Capacitance vs voltage graphs

· Temperature performance

Frequently Asked Questions [FAQ]

What is BPW34 photodiode price?

The BPW34 is an affordable optical sensor, typically priced between $0.2 and $2 per unit depending on supplier, quantity, and region. Bulk purchases reduce cost per unit. Prices vary slightly based on manufacturer, distributor, and shipping fees, but it remains a cost-effective choice for electronic and industrial applications.

How to use BPW34?

Can use in photovoltaic mode (zero bias) for low-noise light detection or photoconductive mode (reverse bias) for higher speed and sensitivity. Connect the anode and cathode correctly, and pair it with a resistor or transimpedance amplifier to convert the photocurrent into a measurable voltage signal.

What is the sensitivity of BPW34?

The BPW 34 has high radiant sensitivity, with peak response around 900 nm in the near-infrared spectrum. It is capable of detecting low-intensity light and operates effectively across the 400–1100 nm wavelength range, covering visible and NIR light for optical sensing, automation, and high-speed detection applications.

What is the fall time of BPW34?

The typical fall time of the BPW 34 is around 20–100 ns, depending on circuit conditions such as load resistance and capacitance. Its fast response makes it suitable for high-speed detection and pulse measurement, enabling reliable operation in optical communication, light barriers, and high-frequency sensing applications.

What are the typical applications for a BPW34?

Use in electronic equipment, industrial automation, high-speed photodetection, optical communication, light meters, IR receivers, and reflective or proximity sensors. Also use in DIY electronics projects, Arduino light-sensing circuits, and laboratory optical experiments because its reliability, fast response, and compact design.

What is the bandwidth of BPW34?

The BPW 34 photodiode can operate in the MHz range, depending on the circuit configuration. Its fast switching time of approximately 20 ns allows it to handle high-frequency optical signals, making it suitable for data transmission, pulse detection, and high-speed optical communication applications.

What is the photosensitive area of BPW34?

The BPW34 has a photosensitive area of approximately 7.5 mm², providing sufficient surface for efficient light detection. This area ensures good light capture for both visible and near-infrared wavelengths, allowing accurate and stable measurements in optical sensing, industrial automation, and communication systems.

What is the storage temperature range of BPW34?

Can safely store the BPW 34 photodiode within the temperature range of –40°C to +100°C. Proper storage ensures the device maintains its optical and electrical characteristics, preventing damage from extreme temperatures, moisture, or environmental stress during handling and transportation.

Conclusion

The BPW34 photodiode is a highly versatile and reliable optical sensor, known for its high speed, wide spectral sensitivity, and compact DIP package. Its ability to detect both visible and near-infrared light, combined with a fast response time of around 20 ns, makes it suitable for applications ranging from industrial automation and optical communication to consumer electronics and DIY projects. With strong ESD protection, corrosion resistance, and a stable package, the BPW 34 provides consistent performance in demanding environments. Affordable, widely available, and easy to integrate, it remains a popular choice for engineers, hobbyists, and designers seeking a cost-effective, high-performance photodiode.

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