INDUSTRY COMPONENT

Package Window

Transparent protective window for photodiode receiver packaging that allows light transmission while shielding sensitive components.

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Component Specifications

Definition
A precision optical component integrated into photodiode receiver packaging that serves as a transparent interface between the external environment and the photosensitive semiconductor element. It maintains hermetic sealing while permitting specific wavelengths of light to reach the photodiode, protecting against contaminants, moisture, and mechanical damage while optimizing optical performance through anti-reflective coatings and precise geometric tolerances.
Working Principle
The package window operates on principles of optical transmission and environmental protection. It transmits incident photons within the photodiode's spectral response range (typically 400-1100nm for silicon photodiodes) while blocking harmful particles and moisture. Its optical properties are engineered to minimize reflection losses and maintain signal integrity through precise thickness control, surface flatness, and coating applications that enhance transmission efficiency.
Materials
Optical-grade fused silica (SiO₂) or borosilicate glass with anti-reflective coatings (MgF₂ or multilayer dielectric coatings). Alternative materials include sapphire (Al₂O₃) for extreme environments or optical polymers like polycarbonate for cost-sensitive applications. Material specifications include: transmission >90% at target wavelengths, thermal expansion coefficient matching packaging materials, and chemical resistance to cleaning agents.
Technical Parameters
  • Coating Broadband AR coating (400-1100 nm)
  • Diameter 3.0-10.0 mm
  • Thickness 0.5-2.0 mm
  • Parallelism <3 arc minutes
  • Scratch-Dig 80-50 per MIL-PRF-13830B
  • Transmission >90% @ 400-1100 nm
  • Surface Quality 40-20 scratch-dig
  • Surface Flatness λ/4 at 632.8 nm
Standards
ISO 10110, ISO 14997, DIN 3140, MIL-PRF-13830B

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Package Window.

photodiode package window optical window component receiver protection window hermetic sealing window anti-reflective coated window optoelectronic packaging Package Window Package Window in Computer, Electronic and Optical Product Manufacturing

Parent Products

This component is used in the following industrial products

Photodiode Receiver

A semiconductor device that converts infrared light signals into electrical current within an optical port system.

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Engineering Analysis

Risks & Mitigation
  • Optical degradation from surface contamination
  • Mechanical failure due to thermal stress
  • Hermetic seal compromise leading to moisture ingress
  • Coating delamination under UV exposure
FMEA Triads
Trigger: Improper cleaning during installation
Failure: Surface contamination reducing light transmission
Mitigation: Implement cleanroom handling procedures and use specified optical cleaning solvents with lint-free wipes
Trigger: Thermal expansion mismatch between window and package
Failure: Cracking or seal failure during temperature cycling
Mitigation: Select materials with matched thermal expansion coefficients and implement gradual thermal cycling during manufacturing

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.1 mm diameter, ±0.05 mm thickness, surface flatness λ/4
Test Method
ISO 10110 optical testing, helium leak testing for hermeticity (<1×10⁻⁸ atm·cc/sec), spectral transmission measurement per ISO 13696

Buyer Feedback

★★★★☆ 4.6 / 5.0 (9 reviews)

"The Package Window we sourced perfectly fits our Computer, Electronic and Optical Product Manufacturing production line requirements."

"Found 33+ suppliers for Package Window on CNFX, but this spec remains the most cost-effective."

"The technical documentation for this Package Window is very thorough, especially regarding technical reliability."

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Frequently Asked Questions

What is the primary function of a package window in photodiode receivers?

The package window serves dual functions: transmitting target light wavelengths to the photodiode while providing hermetic sealing against environmental contaminants, moisture, and mechanical damage to ensure long-term reliability and consistent optical performance.

How do anti-reflective coatings improve package window performance?

Anti-reflective coatings reduce surface reflections by up to 99%, increasing light transmission to the photodiode active area. This improves signal-to-noise ratio, enhances sensitivity, and minimizes stray light interference that could cause measurement errors in precision optical systems.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Package Substrate Package/Casing