QBEC5120 Infrared Emitter 940nm - Equivalent & Substitute Parts

Part Overview

The QBEC5120 is a 3mm infrared (IR) emitter operating at 940nm wavelength, designed for through-hole radial mounting applications. Manufactured by QT Brightek (QTB), this component delivers 30mW/sr radiant intensity at 50mA forward current with a 20° viewing angle and 1.4V typical forward voltage. The product is classified as obsolete, necessitating identification of active equivalent components for ongoing design requirements and production continuity.

Substiute Parts

QBEC5120

QT Brightek (QTB)In Stock: 761QBEC5120 Datasheet

Current PartRFQ

HR5P-N4FB-00000

Broadcom LimitedIn Stock: 1870HR5P-N4FB-00000 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the QBEC5120 is determined by the following critical parameters:

Primary Matching Criteria:

• Wavelength: 940nm (exact match required for spectral compatibility)
• Mounting Type: Through Hole Radial (mechanical compatibility)
• Package / Case: Radial (physical form factor)
• Type: Infrared (IR) Emitter (functional category)

Secondary Compatibility Factors:

• Forward voltage (Vf) within acceptable circuit design tolerance
• Operating temperature range sufficient for application environment
• RoHS3 compliance for regulatory alignment
• Radiant intensity and viewing angle may vary within application-specific limits

The HR5P-N4FB-00000 (Broadcom Limited) qualifies as a substitute based on matching wavelength (940nm), mounting type (through hole), package configuration (radial), and regulatory compliance (ROHS3). Differences in maximum forward current, radiant intensity, viewing angle, and operating temperature range are documented in the parameter comparison table below.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: HR5P-N4FB-00000 (Broadcom Limited)

The HR5P-N4FB-00000 is the qualified substitute for the obsolete QBEC5120. Selection is based on:

• Wavelength Compatibility: Both components operate at 940nm, ensuring spectral alignment with receiver optics and filter specifications.
• Mechanical Compatibility: Identical through-hole radial mounting and package configuration enable direct PCB layout compatibility.
• Regulatory Compliance: Both components maintain ROHS3 compliance, satisfying environmental and procurement standards.
• Active Production Status: The HR5P-N4FB-00000 is in active production, ensuring long-term availability and supply chain continuity.
• Operating Temperature: The substitute's extended upper temperature limit (-40°C to 85°C) provides additional thermal margin.

Design Considerations:

The HR5P-N4FB-00000 exhibits the following differences that require circuit-level evaluation:

• Maximum Forward Current: Rated at 100mA versus 50mA for the original. Circuit current-limiting resistors must be verified to ensure operation within the substitute's safe operating area.
• Viewing Angle: The 50° beam angle is wider than the original 20° specification. Applications requiring narrow-angle emission may require optical redesign or beam-shaping optics.
• Forward Voltage: The 0.02V difference (1.42V vs. 1.4V) is negligible for most circuit designs but should be verified in precision current-source applications.

Frequently Asked Questions (FAQ)

Q1: Can the HR5P-N4FB-00000 be used as a direct drop-in replacement for the QBEC5120?

A: The HR5P-N4FB-00000 is mechanically and electrically compatible for through-hole radial mounting. However, circuit current-limiting design must be verified to accommodate the substitute's higher maximum forward current rating (100mA vs. 50mA). Additionally, the wider viewing angle (50° vs. 20°) may affect optical performance in applications requiring narrow-angle emission.

Q2: What are the critical parameters for IR emitter substitution?

A: Wavelength, mounting type, and package configuration are the primary criteria. For the QBEC5120, the 940nm wavelength is essential for receiver compatibility. The through-hole radial package ensures mechanical fit. Forward voltage, current rating, and viewing angle are secondary parameters that must be evaluated within the specific circuit and optical design context.

Q3: Are there any compliance or regulatory differences between the two components?

A: Both the QBEC5120 and HR5P-N4FB-00000 are ROHS3 compliant. The HR5P-N4FB-00000 carries REACH Unaffected status, providing additional regulatory documentation. Both components are classified under ECCN EAR99 and HTSUS 8541.41.0000.

Q4: How does the viewing angle difference affect application performance?

A: The QBEC5120 has a 20° viewing angle, while the HR5P-N4FB-00000 has a 50° viewing angle. Narrower angles concentrate emission intensity in a specific direction; wider angles distribute emission over a broader area. Applications requiring focused IR transmission (e.g., proximity sensing with directional receivers) may require optical redesign or beam-limiting apertures when substituting to the wider-angle component.

Q5: What is the impact of the different maximum forward current ratings?

A: The QBEC5120 is rated for 50mA maximum, while the HR5P-N4FB-00000 is rated for 100mA. Circuit designs must ensure that current-limiting resistors and power supply configurations do not exceed the original component's 50mA specification if maintaining identical electrical operating points. Alternatively, designs may be optimized to operate the substitute at higher current levels within its 100mA rating, subject to thermal and reliability analysis.

Q6: Is the HR5P-N4FB-00000 available in the same packaging format?

A: Yes. Both components use through-hole radial mounting and radial package configuration. The HR5P-N4FB-00000 is supplied in bulk packaging, whereas the QBEC5120 was supplied in standard packaging. This difference affects procurement and handling but does not impact electrical or mechanical compatibility.