SFH 4640-UV Equivalent & Substitute Parts

Part Overview

The SFH 4640-UV is an infrared (IR) emitter manufactured by ams-OSRAM USA INC., designed for applications requiring 950nm wavelength emission. This component operates at 1.5V forward voltage with a maximum DC forward current of 100mA and delivers 40mW/sr radiant intensity at rated current. The device is packaged in a 2-SMD, No Lead surface mount configuration with a 30° viewing angle.

The SFH 4640-UV maintains Active product status and is RoHS3 compliant. Substitute parts are identified based on matching electrical characteristics and functional equivalence within the infrared emitter category. Alternative components may be required due to packaging preferences, inventory availability, or specific application constraints.

Substiute Parts

SFH 4640-UV

ams-OSRAM USA INC.In Stock: 1011SFH 4640-UV Datasheet

Current PartRFQ

SFH 4248-Z

ams-OSRAM USA INC.In Stock: 1114SFH 4248-Z Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SFH 4640-UV is determined by the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Wavelength: 950nm (exact match required)
• Forward Voltage (Vf): 1.5V (typical)
• Maximum DC Forward Current (If): 100mA (maximum rating)
• Operating Temperature Range: -40°C ~ 100°C (minimum coverage required)

Mechanical Compatibility Criteria:

• Mounting Type: Surface Mount
• Viewing Angle: 30° (standard for this application class)

Compliance Requirements:

• RoHS3 Compliant
• REACH Unaffected status

The SFH 4248-Z qualifies as a substitute based on matching wavelength (950nm), forward voltage (1.5V), maximum current rating (100mA), viewing angle (30°), operating temperature range (-40°C ~ 100°C), and compliance certifications. Radiant intensity differs between the main part and substitute, which affects optical output performance but does not prevent functional substitution in applications where the higher intensity of the SFH 4248-Z is acceptable or beneficial.

Parameter Comparison

Engineering Selection Recommendations

SFH 4640-UV (Primary Selection)

The SFH 4640-UV is the recommended primary component for new designs. This part maintains Active product status, ensuring long-term availability and manufacturing continuity. The 2-SMD, No Lead package provides compact board integration suitable for space-constrained applications. RoHS3 compliance and REACH Unaffected status satisfy environmental and regulatory requirements.

SFH 4248-Z (Substitute Selection)

The SFH 4248-Z functions as an electrical and optical substitute with the following considerations:

The SFH 4248-Z carries Obsolete product status, indicating discontinued manufacturing and limited future availability. This component is suitable only for legacy system maintenance, repair, or applications where existing inventory is available. The 4-PLCC package differs from the main part's 2-SMD configuration, requiring PCB layout modification.

The SFH 4248-Z delivers 100mW/sr radiant intensity compared to the SFH 4640-UV's 40mW/sr. This 2.5× intensity increase provides enhanced optical output, which is beneficial in applications requiring higher signal strength but may require optical design adjustment in systems optimized for the lower intensity of the main part.

Both components share identical electrical ratings (1.5V, 100mA maximum), wavelength (950nm), viewing angle (30°), and operating temperature range (-40°C ~ 100°C), enabling functional substitution at the circuit level.

Frequently Asked Questions (FAQ)

Q: Can the SFH 4248-Z directly replace the SFH 4640-UV in existing designs?

A: Electrical substitution is possible due to matching voltage, current, and wavelength specifications. However, PCB layout modification is required due to package differences (2-SMD, No Lead versus 4-PLCC). The higher radiant intensity of the SFH 4248-Z (100mW/sr versus 40mW/sr) may affect optical system performance and requires evaluation in the target application.

Q: What is the significance of the Obsolete status for the SFH 4248-Z?

A: Obsolete status indicates that ams-OSRAM USA INC. has discontinued manufacturing of this component. New production is unavailable. The SFH 4248-Z is suitable only for repair of existing systems or applications where existing inventory is confirmed available. For new designs, the Active-status SFH 4640-UV is the appropriate selection.

Q: Are there package compatibility issues between these parts?

A: Yes. The SFH 4640-UV uses a 2-SMD, No Lead package, while the SFH 4248-Z uses a 4-PLCC package. These packages have different footprints, pin configurations, and board mounting requirements. PCB redesign is necessary for substitution.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the SFH 4640-UV and SFH 4248-Z are RoHS3 compliant and REACH Unaffected. Both carry Moisture Sensitivity Level 2 (1 Year) ratings. Compliance requirements are satisfied by either component.

Q: How does the radiant intensity difference affect substitution?

A: The SFH 4248-Z produces 2.5 times greater radiant intensity (100mW/sr) than the SFH 4640-UV (40mW/sr) at identical forward current (100mA). In applications where optical output is critical, this difference requires system-level evaluation. Higher intensity may improve signal detection in weak-signal applications or necessitate optical attenuation in systems designed for lower intensity.

Q: What is the operating temperature range for both parts?

A: Both components operate across the identical temperature range of -40°C to 100°C (TA). Temperature performance is equivalent between the main part and substitute.