SD5421-002 Equivalent & Substitute Parts Reference

Part Overview

The SD5421-002 is a photodiode optical sensor manufactured by Honeywell Sensing and Productivity Solutions, housed in a TO-46 package with a 15 nanosecond response time and 18° viewing angle. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations. The part operates across an extended temperature range of -55°C to 125°C and features PIN diode architecture with 75V maximum reverse voltage rating.

Substiute Parts

SD5421-002

Honeywell Sensing and Productivity SolutionsIn Stock: 2874SD5421-002 Datasheet

Current PartRFQ

OP913SL

TT Electronics/Optek TechnologyIn Stock: 1283OP913SL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete SD5421-002 is evaluated based on the following critical parameters:

Diode Architecture: Both the main part and substitute maintain PIN diode configuration, ensuring equivalent photoelectric conversion principles and operational behavior.

Response Time: The SD5421-002 specifies 15ns response time. The OP913SL substitute does not provide response time specification in available data; however, PIN photodiodes in the TO-5 package class typically operate within comparable nanosecond-range response windows suitable for general-purpose optical sensing applications.

Reverse Voltage Rating: The SD5421-002 supports 75V maximum reverse bias. The OP913SL is rated at 32V maximum reverse voltage, representing a reduced voltage capability that requires circuit redesign if the original application demands the full 75V operating range.

Dark Current: The SD5421-002 exhibits 20nA typical dark current; the OP913SL shows 25nA, a marginal increase that remains within acceptable noise performance for most optical sensing circuits.

Viewing Angle: The SD5421-002 provides 18° viewing angle; the OP913SL offers 45°, indicating a wider field of view that may alter optical system geometry and sensitivity distribution.

Operating Temperature: The SD5421-002 operates from -55°C to 125°C; the OP913SL extends to -65°C minimum, providing enhanced low-temperature performance.

Mounting and Packaging: Both components use through-hole mounting. The SD5421-002 uses TO-46 package; the OP913SL uses TO-5 variant with 2 leads and lens top metal can, requiring mechanical redesign of optical and mechanical interfaces.

Regulatory Compliance: The SD5421-002 is RoHS Compliant; the OP913SL is ROHS3 Compliant and REACH Unaffected, meeting current regulatory standards.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The SD5421-002 is classified as obsolete. The OP913SL is active and currently manufactured, ensuring long-term availability and supply chain continuity for new designs and system maintenance.

Compliance and Certification: Both components meet RoHS requirements. The OP913SL carries ROHS3 Compliant status and REACH Unaffected designation, aligning with current regulatory frameworks. Selection of the OP913SL supports compliance with evolving environmental and safety standards.

Reverse Voltage Limitation: The OP913SL maximum reverse voltage of 32V is substantially lower than the SD5421-002 rating of 75V. Applications requiring bias voltages exceeding 32V cannot use the OP913SL without circuit modification. Verify original circuit bias voltage requirements before substitution.

Optical Field of View: The OP913SL provides a 45° viewing angle compared to the SD5421-002 18° angle. This wider field of view alters optical sensitivity distribution and spatial response. Optical system redesign may be necessary to maintain original performance characteristics.

Package and Mechanical Integration: The transition from TO-46 to TO-5 package requires mechanical redesign of component mounting, socket interfaces, and optical path alignment. Physical space constraints and optical coupling mechanisms must be re-evaluated.

Response Time: The SD5421-002 specifies 15ns response time. The OP913SL response time is not provided in available specifications. For applications with strict timing requirements, contact the manufacturer to confirm OP913SL response time performance before final selection.

Frequently Asked Questions (FAQ)

Q: Can the OP913SL directly replace the SD5421-002 without circuit modification?

A: Direct replacement is not possible due to package differences (TO-46 versus TO-5) and reduced maximum reverse voltage (32V versus 75V). Mechanical redesign of the component socket and optical interface is required. Circuit redesign is necessary if the original application uses bias voltages exceeding 32V.

Q: What is the impact of the different viewing angles (18° versus 45°)?

A: The OP913SL provides a wider optical field of view. This affects spatial sensitivity distribution and may alter system performance in applications requiring narrow-angle optical detection. Optical system geometry and lens design may require adjustment to maintain original performance characteristics.

Q: Is the OP913SL suitable for applications requiring the full 75V reverse bias of the SD5421-002?

A: No. The OP913SL maximum reverse voltage is 32V. Applications requiring 75V bias voltage cannot use the OP913SL. Alternative components with higher voltage ratings must be identified.

Q: How do the dark current specifications compare?

A: The SD5421-002 exhibits 20nA typical dark current; the OP913SL shows 25nA. This 5nA increase is marginal and acceptable for most optical sensing applications. Signal-to-noise ratio impact is minimal in typical circuit configurations.

Q: Are both components RoHS compliant?

A: Yes. The SD5421-002 is RoHS Compliant. The OP913SL is ROHS3 Compliant and REACH Unaffected, meeting current regulatory standards for electronic component manufacturing and environmental compliance.

Q: What response time does the OP913SL provide?

A: Response time specification for the OP913SL is not provided in available technical data. The SD5421-002 specifies 15ns response time. For applications with critical timing requirements, manufacturer specifications for OP913SL response time must be obtained to confirm suitability.

Q: Can the OP913SL operate across the same temperature range as the SD5421-002?

A: The OP913SL extends the low-temperature operating limit to -65°C compared to the SD5421-002 minimum of -55°C. Both components support 125°C maximum operating temperature. The OP913SL provides enhanced low-temperature performance.

Q: What are the lead count and package form differences?

A: The SD5421-002 uses TO-46 package. The OP913SL uses TO-5 variant with 2 leads and lens top metal can. These different package forms require mechanical redesign of component mounting, socket interfaces, and optical coupling mechanisms.