QSD122 Equivalent & Substitute Parts

Part Overview

The QSD122 is a phototransistor optical sensor operating at 880nm wavelength in a radial, 5mm diameter (T 1 3/4) through-hole package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The QSD123 serves as the direct active substitute, maintaining identical electrical and mechanical specifications while offering current availability and active product status.

Substiute Parts

QSD122

onsemiIn Stock: 2195QSD122 Datasheet

Current PartRFQ

QSD123

onsemiIn Stock: 898QSD123 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the QSD122 with the QSD123 is based on strict equivalence across all critical electrical and mechanical parameters. Both components share identical specifications for wavelength (880nm), voltage rating (30 V max), dark current (100 nA max), viewing angle (24°), power dissipation (100 mW max), mounting configuration (through-hole), orientation (top view), operating temperature range (-40°C to 100°C), and physical package dimensions (radial, 5mm diameter T 1 3/4). The primary distinction is product status: QSD122 is obsolete while QSD123 is active, making QSD123 the appropriate selection for new designs and ongoing procurement.

Parameter Comparison

Engineering Selection Recommendations

The QSD123 is the appropriate selection for applications currently using or specifying the QSD122. Both components are manufactured by onsemi and maintain full electrical and mechanical compatibility. The QSD122's obsolete status necessitates transition to the QSD123 for new procurement and design continuity. The QSD123 carries RoHS3 compliance certification, providing enhanced environmental and regulatory alignment for modern applications. Both parts maintain REACH Unaffected status and identical export classification (EAR99), ensuring consistent supply chain and regulatory handling.

Frequently Asked Questions (FAQ)

Q: Can QSD123 be used as a direct replacement for QSD122 in existing designs? A: Yes. The QSD123 is electrically and mechanically identical to the QSD122 across all specified parameters, including wavelength (880nm), voltage rating (30 V), dark current (100 nA), viewing angle (24°), power rating (100 mW), and physical package dimensions (radial, 5mm T 1 3/4 through-hole). No circuit modifications are required.

Q: What is the primary reason for substituting QSD122 with QSD123? A: The QSD122 is classified as obsolete. The QSD123 is the active equivalent from the same manufacturer, ensuring continued availability and supply chain reliability.

Q: Are there any compliance differences between QSD122 and QSD123? A: Both components maintain identical REACH Unaffected and EAR99 export classification status. The QSD123 carries RoHS3 compliance certification, which may be required for certain applications and markets.

Q: Do the packages differ between these parts? A: No. Both components use identical radial, 5mm diameter (T 1 3/4) through-hole packaging with top-view orientation, ensuring mechanical and PCB layout compatibility.

Q: What are the critical parameters for substitution in this product category? A: For 880nm phototransistors in this package class, the critical parameters are wavelength (880nm), voltage rating (30 V max), dark current specification (100 nA max), viewing angle (24°), power dissipation (100 mW max), and physical package configuration (radial, 5mm T 1 3/4 through-hole). All parameters must match for direct substitution.