LTR-306 Equivalent & Substitute Parts

Part Overview

The LTR-306 is an active phototransistor optical sensor manufactured by Lite-On Inc., designed for 940nm infrared detection applications. This component operates in side view radial configuration with through-hole mounting. The part is currently in active production status with substantial inventory availability (42,565 pcs). Substitute parts may be required due to supply chain constraints, regional availability, or specific application requirements where alternative wavelength sensitivity or operating temperature ranges are acceptable within system design parameters.

Substiute Parts

LTR-306

Lite-On Inc.In Stock: 42629LTR-306 Datasheet

Current PartRFQ

QSE113

onsemiIn Stock: 30621QSE113 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The QSE113 manufactured by onsemi qualifies as a substitute for the LTR-306 based on the following alignment of critical parameters:

Matching Parameters:

• Voltage - Collector Emitter Breakdown (Max): 30 V
• Current - Dark (Id) (Max): 100 nA
• Power - Max: 100 mW
• Mounting Type: Through Hole
• Orientation: Side View
• Package / Case: Radial, Side View
• RoHS Status: ROHS3 Compliant
• Product Status: Active

Differing Parameters:

• Wavelength: 880nm (QSE113) vs. 940nm (LTR-306)
• Viewing Angle: 50° (QSE113) vs. 30° (LTR-306)
• Operating Temperature: -40°C ~ 100°C (QSE113) vs. -40°C ~ 85°C (LTR-306)
• Current - Collector (Ic) (Max): Not specified for QSE113

Substitution is valid where the 880nm wavelength sensitivity and 50° viewing angle are compatible with system design requirements, and where the extended upper operating temperature limit of 100°C provides additional thermal margin.

Parameter Comparison

Engineering Selection Recommendations

Both the LTR-306 and QSE113 maintain active production status and full ROHS3 compliance. Selection between these components depends on application-specific requirements regarding infrared wavelength sensitivity and thermal operating range. The LTR-306 provides 940nm wavelength detection with a 30° viewing angle and operates to 85°C. The QSE113 provides 880nm wavelength detection with a wider 50° viewing angle and extended thermal operation to 100°C. Both components share identical electrical ratings for breakdown voltage and dark current, and both support 100 mW maximum power dissipation in radial through-hole packages. Component selection should be based on system spectral requirements and thermal environment specifications.

Frequently Asked Questions (FAQ)

Q: Can QSE113 be used as a direct replacement for LTR-306 in all applications?

A: Direct substitution is valid only where the application design accommodates the 880nm wavelength (versus 940nm) and the wider 50° viewing angle (versus 30°). Electrical and thermal ratings are compatible. System-level optical performance must be evaluated.

Q: What is the significance of the wavelength difference between 940nm and 880nm?

A: Wavelength determines the infrared spectrum to which the phototransistor responds. Applications using 940nm-specific light sources or filters require the LTR-306. Applications using 880nm sources or with broadband infrared detection requirements may use the QSE113.

Q: Does the wider viewing angle of QSE113 affect compatibility?

A: The QSE113 viewing angle of 50° is wider than the LTR-306 at 30°. This affects spatial light collection characteristics. Applications requiring narrow directional sensitivity should use the LTR-306. Applications tolerating or benefiting from wider light collection may use the QSE113.

Q: Are both parts suitable for high-temperature applications?

A: The QSE113 supports operation to 100°C, providing 15°C additional thermal margin compared to the LTR-306 at 85°C. For applications approaching 85°C, the QSE113 offers extended thermal headroom.

Q: What packaging considerations apply to these components?

A: Both components use identical radial through-hole packages in side view orientation. PCB layout and mounting procedures are compatible between the two parts.