BPW34FAS

BPW34FAS is a silicon PIN photodiode from the BPW34 family. It detects light from the visible to near‑IR (roughly 400–1100 nm), with peak sensitivity around 900–950 nm. The device provides a linear photocurrent proportional to irradiance, has low dark current and fast response, and is commonly used in IR remote sensing, optical receivers, and simple photometry.
Key points:
- Package: axial glass DO-35 style with two leads.
- Operation: typically reverse-biased (or zero bias) for faster response and lower junction capacitance.
- Signal handling: current output is converted to voltage with a transimpedance amplifier; choose bias and load to balance speed and noise.
- Common uses: IR remote detectors, light sensing in hobby electronics, linear photodiode experiments.
Notes:
- For exact specs (dark current, responsivity, capacitance, rise/fall time) and any variant differences, refer to the BPW34FAS datasheet from the manufacturer.

BPW34FAS is a Silicon PIN photodiode. Common drop‑in equivalents from other vendors include:
- Vishay BPW34 family (BPW34, BPW34F, BPW34S)
- Osram SFH 203 P
- Hamamatsu S5971/S5972
Note: check package, lead spacing and spectral response in datasheets to ensure compatibility.

BPW34FAS features (summary):
- Silicon PIN photodiode for fast optical detection
- Spectral range: ~400–1100 nm (visible to near-IR)
- Responsivity: about 0.5–0.6 A/W near 850–900 nm
- Very low dark current (tens of nA at room temp)
- Low junction capacitance (roughly 20–30 pF)
- Fast response with nanosecond-scale rise times; bandwidth in the tens of MHz
- Linear, wide dynamic range suitable for photometry and sensing
- Reverse-bias operation (0–tens of volts) to speed up response; used in transimpedance circuits
- Compact, robust packaging typical of BPW34 family
- Operating temperature range roughly -40 to +85 C
Typical applications: photometry, IR remote sensing, fiber-optic receivers, optical communications, color/light sensing.

- Pin count: 2 leads (anode and cathode)
- Function: Silicon PIN photodiode used as a light detector; converts incident light into photocurrent. Typically operated in reverse bias or zero bias, often read with a transimpedance amplifier or a load resistor.

- Manufacturer: Vishay Intertechnology (Vishay).
- What kind of company: A global electronics components company that designs and manufactures discrete semiconductors and passive components (e.g., diodes including photodiodes, transistors, resistors, capacitors, optoelectronics).

BPW34FAS is a silicon PIN photodiode with fast response and high sensitivity (roughly 400–1100 nm). Common applications:
- Optical communications receivers (fiber/IR) and demodulation
- Ambient light/illuminance sensing for cameras, displays, and mobile devices
- IR remote-control receivers and proximity sensing
- Optical power monitoring for lasers/LEDs and photometric detection
- Laboratory instrumentation for light measurement, spectroscopy, and imaging sensors
- Robotics/automation sensing (line-following, obstacle/ambient light sensing)

DO-35 axial package (axial lead).