SFH 4645 Equivalent & Substitute Parts

Part Overview

The SFH 4645 is an Infrared (IR) Emitter operating at 950nm wavelength, designed for surface mount applications requiring high radiant intensity output. This component is manufactured by ams-OSRAM USA INC. and maintains Active product status with full RoHS3 compliance. The SFH 4645 delivers 25mW/sr radiant intensity at 100mA forward current with a 30° viewing angle, housed in a 2-SMD, No Lead package.

Substitute parts are identified when equivalent functional performance can be achieved within the allowed electrical and mechanical parameters of the infrared emitter category, accounting for variations in forward current, radiant intensity, viewing angle, and operating temperature range.

Substiute Parts

SFH 4645

ams-OSRAM USA INC.In Stock: 1118SFH 4645 Datasheet

Current PartRFQ

SFH 4045N

ams-OSRAM USA INC.In Stock: 20869SFH 4045N Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SFH 4645 are identified based on the following criteria:

Primary Matching Parameters:

• Wavelength: 950nm (identical)
• Package Type: 2-SMD, No Lead (identical)
• Mounting Type: Surface Mount (compatible)
• Manufacturer: ams-OSRAM USA INC. (same manufacturer)
• RoHS Compliance: ROHS3 Compliant (equivalent regulatory status)

Variable Parameters Allowing Substitution:

• Current - DC Forward (If) (Max): Tolerance range for application requirements
• Voltage - Forward (Vf) (Typ): Minor variations acceptable within circuit design margins
• Radiant Intensity (Ie) Min @ If: Output intensity variations based on forward current
• Viewing Angle: Application-dependent field of view requirements
• Operating Temperature Range: Extended or reduced range based on deployment environment

The SFH 4045N qualifies as a substitute part when application requirements permit operation at reduced forward current (70mA versus 100mA) and can accommodate the narrower viewing angle (18° versus 30°).

Parameter Comparison

Engineering Selection Recommendations

SFH 4645 Primary Selection: The SFH 4645 is the appropriate choice for applications requiring maximum forward current capacity (100mA) and extended operating temperature range to 100°C. This component maintains Active product status with full RoHS3 compliance and REACH Unaffected designation.

SFH 4045N Substitution Criteria: The SFH 4045N (CHIPLED series) qualifies as a substitute when the following conditions are met:

1. Application forward current requirement does not exceed 70mA
2. Operating environment maintains temperatures below 85°C
3. Viewing angle of 18° satisfies optical field-of-view requirements
4. Higher radiant intensity at reduced current (90mW/sr @ 70mA) is compatible with system design
5. Forward voltage tolerance of 1.6V (versus 1.5V) is acceptable within circuit design margins

Both components maintain identical wavelength (950nm), package configuration (2-SMD, No Lead), and regulatory compliance (ROHS3, REACH Unaffected, EAR99 ECCN classification).

Frequently Asked Questions (FAQ)

Q: Can the SFH 4045N directly replace the SFH 4645 in all applications?

A: No. The SFH 4045N operates at a maximum forward current of 70mA compared to the SFH 4645's 100mA rating. Substitution requires verification that the application circuit operates within the 70mA current limit and that the operating temperature remains below 85°C.

Q: What is the primary difference in radiant intensity between these parts?

A: The SFH 4045N delivers 90mW/sr at 70mA, while the SFH 4645 delivers 25mW/sr at 100mA. The SFH 4045N achieves higher intensity output at lower forward current due to design optimization within the CHIPLED series.

Q: Are the viewing angles interchangeable?

A: The viewing angles differ: SFH 4645 provides 30° while SFH 4045N provides 18°. Applications requiring a wider field of view must use the SFH 4645. Applications with narrower optical requirements can accommodate the SFH 4045N's 18° angle.

Q: Do both parts use identical packaging?

A: Both components use 2-SMD, No Lead surface mount packages. The SFH 4045N offers an additional right angle mounting option. PCB layout compatibility requires verification of the specific mounting orientation required by the application.

Q: What is the forward voltage difference impact?

A: The SFH 4045N operates at 1.6V typical forward voltage versus the SFH 4645's 1.5V. This 0.1V difference falls within standard circuit design tolerance margins and does not typically require circuit redesign for most applications.

Q: Are there temperature range limitations for substitution?

A: Yes. The SFH 4045N maximum operating temperature is 85°C, compared to the SFH 4645's 100°C. Applications operating above 85°C require the SFH 4645. The lower temperature limit (-40°C) is identical for both components.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both the SFH 4645 and SFH 4045N are ROHS3 Compliant, REACH Unaffected, and classified under ECCN EAR99 with identical HTSUS code 8541.41.0000.