QSE258 Equivalent & Substitute Parts

Part Overview

The QSE258 is an optical sensor from onsemi's OPTOLOGIC® series, designed as a sidelooker photo detector with 880nm wavelength detection and logic output. The device features an open collector output configuration in a radial, 3-lead side view package. The QSE258 is currently classified as obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Substiute Parts

QSE258

onsemiIn Stock: 1057QSE258 Datasheet

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QSE259

onsemiIn Stock: 1556QSE259 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the QSE258 is determined by the following critical parameters:

• Wavelength: 880nm (infrared detection band)
• Package / Case: Radial, 3 Lead, Side View (mechanical and pin compatibility)
• Operating Temperature Range: -40°C ~ 85°C (TA)
• Output Type: Open Collector (logic interface compatibility)
• Type: Photo Detector, Logic Output (functional classification)

The QSE259 qualifies as a substitute based on matching wavelength, package configuration, operating temperature range, and output interface type. The primary functional difference is the output inversion characteristic (Open Collector Inverter vs. Open Collector), which represents a logic-level modification rather than a fundamental incompatibility in the sensor's optical detection capability.

Parameter Comparison

Engineering Selection Recommendations

The QSE259 is the designated substitute for the obsolete QSE258. Both components share identical wavelength specifications (880nm), package configurations (Radial, 3 Lead, Side View), operating temperature ranges (-40°C ~ 85°C), and regulatory compliance status (REACH Unaffected, EAR99 classification).

The QSE259 maintains active product status with RoHS3 compliance, providing long-term availability and supply chain stability compared to the obsolete QSE258. The output inversion characteristic of the QSE259 (Open Collector Inverter) requires circuit-level logic adjustment in applications previously designed for the QSE258's non-inverted output. This modification is confined to signal conditioning and does not affect the optical detection performance or mechanical integration.

Frequently Asked Questions (FAQ)

Q: Can the QSE259 be used as a direct pin-for-pin replacement for the QSE258?

A: The QSE259 shares identical pin count and package configuration (Radial, 3 Lead, Side View) with the QSE258, enabling mechanical and electrical connection compatibility. However, the inverted logic output requires signal conditioning adjustments in the receiving circuit.

Q: What is the primary difference between the QSE258 and QSE259?

A: Both devices are 880nm photo detectors with open collector outputs in identical packages. The QSE259 features an inverting output stage (Open Collector Inverter), whereas the QSE258 provides non-inverted output. Both operate across the same temperature range and maintain equivalent optical detection characteristics.

Q: Why is the QSE258 listed as obsolete?

A: The QSE258 has reached end-of-life status. The QSE259 remains in active production and serves as the current-generation equivalent within the OPTOLOGIC® series.

Q: Are there compliance or regulatory differences between these parts?

A: Both the QSE258 and QSE259 share identical REACH status (REACH Unaffected) and ECCN classification (EAR99). The QSE259 carries RoHS3 compliance certification, reflecting current regulatory requirements for active products.

Q: What packaging options are available for the QSE259?

A: The QSE259 is supplied in Bulk packaging, whereas the QSE258 packaging specification was not provided in the original documentation.