SFH 4756S Equivalent & Substitute Parts

Part Overview

The SFH 4756S is an Infrared (IR) Emitter operating at 950nm wavelength, manufactured by ams-OSRAM USA INC. as part of the OSLUX series. This component is designed for surface mount applications with a 1414 (3535 Metric) package footprint. The part is classified as Obsolete, necessitating identification of active equivalent components to maintain design continuity and ensure supply chain availability for new production and legacy system support.

Substiute Parts

SFH 4756S

ams-OSRAM USA INC.In Stock: 795SFH 4756S Datasheet

Current PartRFQ

SFH 4727AS

ams-OSRAM USA INC.In Stock: 2801SFH 4727AS Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the SFH 4756S is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Parameters:

• Wavelength: 950nm (must match for spectral compatibility)
• Voltage - Forward (Vf): 2.9V (must match for circuit integration)
• Current - DC Forward (If) (Max): 1.5A (must match for power supply design)

Optical Performance Parameters:

• Radiant Intensity (Ie) Min @ If: Substitute must meet or exceed 450mW/sr @ 1A
• Viewing Angle: Substitute must accommodate circuit design requirements

Mechanical & Environmental Parameters:

• Mounting Type: Surface Mount (required for PCB integration)
• Operating Temperature Range: Substitute must cover or exceed -40°C ~ 85°C
• RoHS Status: ROHS3 Compliant (regulatory requirement)

The SFH 4727AS qualifies as a substitute based on matching electrical parameters (950nm wavelength, 2.9V forward voltage, 1.5A maximum current) and superior optical performance (900mW/sr @ 1A). Physical package differences and enhanced operating temperature range do not preclude substitution when circuit board layout and thermal management accommodate the alternative package geometry.

Parameter Comparison

Engineering Selection Recommendations

The SFH 4727AS is an active substitute for the obsolete SFH 4756S based on the following engineering criteria:

Electrical Equivalence: Both components operate at identical forward voltage (2.9V) and maximum forward current (1.5A) specifications, ensuring direct circuit compatibility without power supply redesign.

Spectral Compatibility: Both emitters operate at 950nm wavelength, maintaining spectral alignment with receiver optics and filter specifications in the original design.

Regulatory Compliance: Both components meet ROHS3 compliance and carry identical ECCN and HTSUS classifications, satisfying procurement and export requirements.

Product Status Advantage: The SFH 4727AS holds Active product status with established supply chain availability (2731 Pcs in stock), compared to the Obsolete status of the SFH 4756S (768 Pcs remaining inventory).

Enhanced Environmental Performance: The SFH 4727AS provides extended operating temperature range (-40°C ~ 125°C versus -40°C ~ 85°C) and improved moisture sensitivity level (MSL 2 versus MSL 4), supporting broader application environments and extended storage capability.

Optical Performance Consideration: The SFH 4727AS delivers doubled radiant intensity (900mW/sr @ 1A versus 450mW/sr @ 1A), providing enhanced optical output. The narrower viewing angle (50° versus 80°) concentrates this output in a tighter beam pattern, requiring optical system evaluation for specific application requirements.

Package Geometry Difference: The SFH 4727AS uses a larger 1515 (3838 Metric) package compared to the 1414 (3535 Metric) package of the SFH 4756S. PCB layout modification is required to accommodate the increased footprint dimensions.

Frequently Asked Questions (FAQ)

Q: Can the SFH 4727AS be used as a direct drop-in replacement for the SFH 4756S?

A: Electrical substitution is direct due to matching voltage and current specifications. Physical substitution requires PCB layout modification to accommodate the larger 1515 (3838 Metric) package footprint compared to the original 1414 (3535 Metric) package.

Q: What are the key electrical parameters that must match for substitution?

A: The critical matching parameters are wavelength (950nm), forward voltage (2.9V), and maximum forward current (1.5A). These parameters ensure circuit compatibility without modifications to power supply, drive circuitry, or receiver optics.

Q: How does the radiant intensity difference affect system performance?

A: The SFH 4727AS provides 900mW/sr @ 1A compared to 450mW/sr @ 1A for the SFH 4756S. This doubled output intensity may require optical system evaluation, particularly in receiver sensitivity settings or signal processing thresholds, to prevent saturation or performance degradation.

Q: What is the significance of the viewing angle difference?

A: The SFH 4756S provides an 80° viewing angle while the SFH 4727AS provides a 50° viewing angle. The narrower angle concentrates optical output in a tighter beam. System design must accommodate this difference in spatial light distribution, particularly in applications requiring wide-angle coverage.

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

A: Both components are ROHS3 compliant and carry identical ECCN (EAR99) and HTSUS (8541.41.0000) classifications. No regulatory or compliance barriers exist for substitution.

Q: What is the impact of the moisture sensitivity level difference?

A: The SFH 4756S has MSL 4 (72 Hours) while the SFH 4727AS has MSL 2 (1 Year). The SFH 4727AS provides superior moisture protection and extended storage capability without special humidity control, reducing handling and storage costs.

Q: Does the extended operating temperature range of the SFH 4727AS provide any advantage?

A: The SFH 4727AS operates from -40°C to 125°C compared to -40°C to 85°C for the SFH 4756S. This extended range supports applications in higher temperature environments and provides additional thermal margin for systems operating near the original upper temperature limit.

Q: What packaging format is the SFH 4727AS supplied in?

A: The SFH 4727AS is supplied in Tape & Reel (TR) packaging, suitable for automated assembly processes. Confirm packaging compatibility with your manufacturing equipment and processes.