PDI-E825 Equivalent & Substitute Parts

Part Overview

The PDI-E825 is an infrared (IR) emitter operating at 850nm wavelength with a maximum forward current of 100mA and typical forward voltage of 1.7V. Housed in a TO-46-2 package for through-hole mounting, this component is classified as obsolete. Due to its obsolete status and limited availability relative to active alternatives, identifying functionally compatible substitute parts is essential for ongoing system design and production continuity.

Substiute Parts

PDI-E825

Advanced PhotonixIn Stock: 814PDI-E825 Datasheet

Current PartRFQ

QED422

Fairchild SemiconductorIn Stock: 5783QED422 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PDI-E825 are identified based on the following critical parameters that determine functional compatibility:

• Package / Case: TO-46-2 (physical and electrical interface compatibility)
• Mounting Type: Through Hole (PCB assembly method)
• Current - DC Forward (If) (Max): 100mA (electrical rating match)
• Type: Infrared (IR) Emitter (functional category)
• Wavelength Range: 850nm nominal (optical performance specification)

The QED422 from Fairchild Semiconductor meets these substitution criteria. While the QED422 operates at 880nm wavelength (30nm offset from the PDI-E825) and has a slightly higher typical forward voltage (1.8V vs. 1.7V), both components share identical maximum forward current ratings (100mA), identical package designation (TO-46-2), and identical mounting methodology (Through Hole). These electrical and mechanical parameters establish functional equivalence for applications where the specific wavelength tolerance and voltage characteristics of the QED422 are acceptable.

Parameter Comparison

Engineering Selection Recommendations

The QED422 is the manufacturer-recommended substitute for the PDI-E825. Both components carry RoHS compliance certifications (RoHS Compliant and ROHS3 Compliant respectively), ensuring regulatory alignment for applications subject to hazardous substance restrictions. The QED422 maintains active product status with significantly higher inventory availability (5677 pcs vs. 792 pcs), supporting production continuity and supply chain stability.

Key differences requiring evaluation:

• Wavelength: The QED422 operates at 880nm versus the PDI-E825 at 850nm. Applications with wavelength-specific optical filtering or detector sensitivity requirements must confirm compatibility within this 30nm offset.
• Operating Temperature Range: The PDI-E825 supports -55°C ~ 125°C while the QED422 supports -40°C ~ 100°C. Systems requiring operation below -40°C or above 100°C cannot use the QED422 as a direct substitute.
• Forward Voltage: The QED422 typical forward voltage is 1.8V compared to 1.7V for the PDI-E825. Circuit designs with tight voltage regulation or current-limiting resistor calculations must account for this 0.1V difference.

Frequently Asked Questions (FAQ)

Q: Can the QED422 be used as a direct replacement for the PDI-E825 in all applications?

A: The QED422 is electrically and mechanically compatible based on matching package (TO-46-2), mounting type (Through Hole), and maximum forward current (100mA). However, substitution suitability depends on application-specific tolerances for wavelength (850nm vs. 880nm), forward voltage (1.7V vs. 1.8V), and operating temperature range (-55°C ~ 125°C vs. -40°C ~ 100°C).

Q: What is the wavelength difference between these parts, and does it matter?

A: The PDI-E825 emits at 850nm while the QED422 emits at 880nm, a 30nm difference. Applications using wavelength-selective optical filters, photodiodes with narrow spectral response, or systems calibrated to specific IR wavelengths must evaluate whether this offset affects performance.

Q: Are both parts RoHS compliant?

A: Yes. The PDI-E825 is RoHS Compliant, and the QED422 is ROHS3 Compliant. Both meet hazardous substance restriction requirements for regulated markets.

Q: What is the temperature operating range difference?

A: The PDI-E825 operates from -55°C to 125°C, while the QED422 operates from -40°C to 100°C. Applications requiring operation below -40°C or above 100°C cannot use the QED422 as a substitute.

Q: Why is the QED422 recommended as a substitute?

A: The QED422 is the manufacturer-recommended substitute, shares identical electrical ratings (100mA maximum forward current), uses the same package (TO-46-2), and maintains active product status with superior inventory availability, ensuring production continuity for the obsolete PDI-E825.