Photosensitive Detector: Spectral Range 400-1100 nm

Component Specifications

Definition

A photosensitive detector is a semiconductor-based electronic device designed to detect and measure light intensity by generating an electrical output proportional to the incident light. In industrial applications, it serves as a critical component in optocouplers and isolation circuits, providing galvanic isolation between input and output stages to prevent electrical interference, enhance safety, and ensure signal integrity in harsh environments. It typically consists of a photodiode or phototransistor that responds to specific wavelengths of light, enabling precise control and monitoring in automated systems.

Working Principle

The working principle involves the photoelectric effect, where incident light photons strike the semiconductor material (e.g., silicon or gallium arsenide), generating electron-hole pairs. This creates a photocurrent proportional to the light intensity. In optocouplers, an LED emits light onto the photosensitive detector, which converts it back into an electrical signal, achieving electrical isolation without direct conductive connection.

Materials

Semiconductor materials: Silicon (Si) for visible to near-infrared range, Gallium Arsenide (GaAs) for infrared applications. Encapsulation: Epoxy resin or ceramic housing for durability and thermal stability. Electrodes: Gold or aluminum wire bonding.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rise Time	10 ns
Dark Current	1 nA max
Package Type	DIP-4, SOP-4
Responsivity	0.5 A/W at 850 nm
Spectral Range	400-1100 nm
Isolation Voltage	5000 Vrms
Operating Temperature	-40°C to +85°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 9001, IEC 60747-5-2, DIN EN 60747-5-2

Parent Products

This component is used in the following industrial products

Optocoupler / Isolation Circuit

An electronic component that transfers electrical signals between two isolated circuits using light, providing electrical isolation and noise immunity.

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Engineering Analysis

Risks & Mitigation

Sensitivity to ambient light interference
Degradation due to prolonged exposure to high-intensity light
Thermal runaway in high-temperature environments

FMEA Triads

Trigger: Overvoltage or electrostatic discharge
Failure: Permanent damage to semiconductor junction
Mitigation: Implement ESD protection circuits and adhere to voltage ratings

Trigger: Contamination during manufacturing
Failure: Reduced light sensitivity or signal noise
Mitigation: Use cleanroom assembly and quality control inspections

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±5% responsivity variation across batches

Test Method

IEC 60747-5-2 for optoelectronic isolation, including isolation voltage testing and spectral response measurement

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Photosensitive Detector

Manufacturer profiles associated with Photosensitive Detector.

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Frequently Asked Questions

What is the primary function of a photosensitive detector in an optocoupler?

It converts light signals from an LED into electrical signals, providing electrical isolation between circuits to prevent noise, surges, and ground loops.

How does temperature affect photosensitive detector performance?

High temperatures can increase dark current and reduce responsivity, so operating within the specified temperature range is crucial for accuracy and longevity.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Photosensitive Detector