SFH 4451-V Equivalent & Substitute Parts

Part Overview

The SFH 4451-V is an Infrared (IR) Emitter operating at 860nm wavelength, designed for surface mount applications in the Power TOPLED® series. This component is classified as Obsolete, necessitating identification of active equivalent parts for continued system design and production support. The SFH 4451-V delivers 63mW/sr radiant intensity at 100mA forward current with a 34° viewing angle in a 2-SMD, No Lead package configuration.

Substiute Parts

SFH 4451-V

ams-OSRAM USA INC.In Stock: 1179SFH 4451-V Datasheet

Current PartRFQ

SFH 4258-Z

ams-OSRAM USA INC.In Stock: 39229SFH 4258-Z Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SFH 4451-V is determined by the following critical parameters that must remain compatible:

Mandatory Matching Parameters:

• Wavelength: 860nm
• Forward Current Rating: 100mA maximum
• Forward Voltage: 1.5V typical
• Mounting Type: Surface Mount
• Series Classification: Power TOPLED®
• RoHS Compliance: ROHS3 Compliant

Allowable Variation Parameters:

• Radiant Intensity: May increase from 63mW/sr (provides enhanced performance)
• Viewing Angle: May decrease from 34° (provides more focused beam)
• Operating Temperature Range: May extend beyond -40°C ~ 85°C (provides broader operational envelope)
• Package Configuration: May differ (2-SMD, No Lead vs. 4-PLCC) provided surface mount capability is maintained
• Product Status: Active status preferred over Obsolete classification

The SFH 4258-Z qualifies as a substitute based on matching wavelength, current rating, voltage specification, and compliance requirements, while offering improved radiant intensity and extended temperature range.

Parameter Comparison

Engineering Selection Recommendations

SFH 4258-Z as Primary Substitute:

The SFH 4258-Z is the manufacturer-recommended substitute for the obsolete SFH 4451-V. Both components share identical electrical specifications for wavelength (860nm), forward current (100mA), and forward voltage (1.5V), ensuring functional compatibility in circuit applications.

The SFH 4258-Z provides performance enhancements over the original part: radiant intensity increases from 63mW/sr to 110mW/sr, and the operating temperature range extends to 100°C maximum. The viewing angle narrows from 34° to 30°, resulting in a more focused beam profile.

Both parts maintain ROHS3 compliance and identical moisture sensitivity ratings, supporting equivalent handling and storage requirements. The SFH 4258-Z holds Active product status, ensuring continued availability and manufacturing support.

Package configuration differs between the two parts: the SFH 4451-V uses a 2-SMD, No Lead package, while the SFH 4258-Z employs a 4-PLCC package. PCB layout and footprint modifications are required for implementation of the substitute part.

Frequently Asked Questions (FAQ)

Q: Can the SFH 4258-Z directly replace the SFH 4451-V without circuit modifications?

A: Electrical compatibility is confirmed through matching wavelength, forward current, and forward voltage specifications. However, package configuration differs (2-SMD, No Lead vs. 4-PLCC), requiring PCB footprint redesign and revalidation of thermal management characteristics.

Q: What is the impact of the increased radiant intensity in the SFH 4258-Z?

A: The SFH 4258-Z delivers 110mW/sr compared to the SFH 4451-V at 63mW/sr. This represents enhanced optical output at identical forward current levels. Circuit designs relying on specific radiant intensity thresholds must account for this performance increase through optical path adjustments or current limiting modifications.

Q: Does the narrower viewing angle of the SFH 4258-Z affect system performance?

A: The SFH 4258-Z provides a 30° viewing angle versus the SFH 4451-V at 34°. This produces a more focused beam profile. Applications requiring wide-angle IR distribution may require optical design adjustments or alternative component selection.

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

A: Both components maintain ROHS3 compliance, REACH Unaffected status, and identical moisture sensitivity levels. No regulatory or compliance barriers exist for substitution.

Q: Why is the SFH 4451-V classified as Obsolete?

A: Obsolete classification indicates the manufacturer has discontinued production. The SFH 4258-Z, with Active status, represents the current manufacturing alternative within the Power TOPLED® series.

Q: What are the thermal operating range implications of the extended temperature specification?

A: The SFH 4258-Z operates to 100°C maximum, compared to 85°C for the SFH 4451-V. This extended range accommodates higher ambient temperature environments without performance degradation, provided thermal management design remains adequate.