SFH 4640 Equivalent & Substitute Parts

Part Overview

The SFH 4640 is an Infrared (IR) Emitter operating at 950nm wavelength, designed for surface mount applications requiring high radiant intensity output. Manufactured by ams-OSRAM USA INC., this component is part of the MIDLED series and maintains Active product status with full RoHS3 compliance.

Substitute parts become necessary when the SFH 4640 experiences supply constraints, when design requirements permit alternative package configurations, or when procurement strategies favor components with different packaging formats. The SFH 4248-Z represents a functionally equivalent alternative with comparable electrical performance but differs in package type and current product availability status.

Substiute Parts

SFH 4640

ams-OSRAM USA INC.In Stock: 2448SFH 4640 Datasheet

Current PartRFQ

SFH 4248-Z

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SFH 4640 is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Wavelength: 950nm (exact match required)
• Forward Current (If Max): 100mA (exact match required)
• Forward Voltage (Vf Typ): 1.5V (exact match required)
• Viewing Angle: 30° (exact match required)
• Operating Temperature Range: -40°C ~ 100°C (exact match required)

Mechanical Compatibility Requirements:

• Mounting Type: Surface Mount (required)
• Orientation: Top View (required)

Regulatory & Compliance Requirements:

• RoHS3 Compliance (required)
• REACH Status: REACH Unaffected (required)

The SFH 4248-Z qualifies as a substitute based on matching all electrical parameters and regulatory compliance. Radiant Intensity differs (100mW/sr vs. 80mW/sr), representing enhanced performance capability. Package configuration differs (4-PLCC vs. 2-SMD, No Lead), requiring PCB layout modification. Packaging format differs (Cut Tape vs. Tape & Reel), affecting procurement and assembly processes.

Parameter Comparison

Engineering Selection Recommendations

SFH 4640 (Primary Selection): The SFH 4640 maintains Active product status with confirmed inventory availability (2428 Pcs). This component is the preferred selection for new designs and ongoing production. Full RoHS3 compliance and REACH Unaffected status satisfy regulatory requirements. The 2-SMD, No Lead package provides compact footprint optimization. Tape & Reel packaging supports automated assembly processes.

SFH 4248-Z (Substitute Selection): The SFH 4248-Z carries Obsolete product status, indicating discontinued manufacturing and limited long-term availability (1019 Pcs current inventory). This component is suitable only for legacy system maintenance, repair operations, or applications where existing PCB layouts are fixed to the 4-PLCC package configuration. The enhanced radiant intensity (100mW/sr vs. 80mW/sr) provides performance margin but does not justify selection for new designs. RoHS3 compliance and REACH Unaffected status maintain regulatory alignment. Cut Tape packaging requires manual or semi-automated assembly handling.

Substitution from SFH 4640 to SFH 4248-Z requires PCB redesign to accommodate the 4-PLCC package footprint and modified lead configuration. This substitution introduces obsolescence risk and should be implemented only when supply constraints for the primary part cannot be resolved through alternative procurement channels.

Frequently Asked Questions (FAQ)

Q: Can the SFH 4248-Z directly replace the SFH 4640 without PCB modification?

A: No. The SFH 4640 uses a 2-SMD, No Lead package while the SFH 4248-Z uses a 4-PLCC package. These packages have different footprints, lead counts, and land patterns. PCB layout redesign is required for mechanical and electrical compatibility.

Q: Are the electrical characteristics identical between these parts?

A: Electrical characteristics are functionally equivalent with one exception. Both parts operate at 950nm wavelength, 100mA forward current, and 1.5V forward voltage. The SFH 4248-Z provides higher radiant intensity (100mW/sr vs. 80mW/sr at 100mA), representing enhanced optical output capability.

Q: Why is the SFH 4248-Z listed as Obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The SFH 4248-Z remains available through existing inventory channels but represents a legacy component. New designs should utilize the Active SFH 4640 to ensure long-term supply continuity.

Q: What are the packaging format differences?

A: The SFH 4640 is supplied in Tape & Reel (TR) format, optimized for automated pick-and-place assembly. The SFH 4248-Z is supplied in Cut Tape (CT) format, requiring manual or semi-automated component handling. This difference affects assembly line compatibility and labor requirements.

Q: Do both parts meet the same regulatory compliance standards?

A: Yes. Both the SFH 4640 and SFH 4248-Z are RoHS3 Compliant and REACH Unaffected. Regulatory compliance is maintained across both components.

Q: What is the Moisture Sensitivity Level (MSL) for these parts?

A: Both components carry MSL 2 (1 Year) rating. This indicates standard moisture sensitivity with a one-year floor life when stored in controlled conditions.

Q: Can the SFH 4248-Z be used in new product designs?

A: The SFH 4248-Z is not recommended for new designs due to Obsolete product status. The SFH 4640 is the appropriate selection for new development to ensure component availability throughout the product lifecycle.