SD1440-004 Equivalent & Substitute Parts

Part Overview

The SD1440-004 is a phototransistor optical sensor manufactured by Honeywell Sensing and Productivity Solutions, designed for 935nm infrared detection applications. This component features a top view coaxial metal can package and operates across an extended temperature range of -55°C to 125°C. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing system support, maintenance, and new design implementations where 935nm photodetection functionality is required.

Substiute Parts

SD1440-004

Honeywell Sensing and Productivity SolutionsIn Stock: 741SD1440-004 Datasheet

Current PartRFQ

LTR-3208E

Lite-On Inc.In Stock: 39100LTR-3208E Datasheet

SimilarRFQ

OP516A

TT Electronics/Optek TechnologyIn Stock: 9048OP516A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SD1440-004 is determined by the following critical parameters:

Primary Substitution Criteria:

• Wavelength compatibility (935nm or adjacent infrared spectrum)
• Voltage rating (Collector Emitter Breakdown minimum 30 V)
• Dark current specification (100 nA maximum)
• Mounting type (Through Hole)
• Orientation (Top View)
• Package compatibility (Coaxial Metal Can preferred; Radial acceptable with mechanical verification)
• Operating temperature range (minimum -55°C to 125°C coverage)

Substitute Parts Identified:

1. LTR-3208E (Lite-On Inc.) - Partial compatibility substitute with wavelength variance
2. OP516A (TT Electronics/Optek Technology) - Direct functional equivalent with identical wavelength and package

The LTR-3208E operates at 940nm (5nm variance from 935nm) with a narrower temperature range (-40°C to 85°C) and radial package configuration. The OP516A maintains 935nm wavelength, identical package type, and extended temperature range matching the original specification.

Parameter Comparison

Engineering Selection Recommendations

OP516A (TT Electronics/Optek Technology) - Primary Substitute

The OP516A is the preferred substitute for SD1440-004 applications. This part maintains identical wavelength specification (935nm), matching package configuration (Coaxial Metal Can), and equivalent operating temperature range (-55°C to 125°C). Both parts share the same 30 V Collector Emitter Breakdown rating and Through Hole mounting type. The OP516A carries ROHS3 compliance and REACH Unaffected status, meeting current regulatory requirements. Product status is Active, ensuring availability and supply chain continuity. No mechanical or electrical redesign is required for direct substitution.

LTR-3208E (Lite-On Inc.) - Secondary Substitute with Constraints

The LTR-3208E functions as a secondary substitute when OP516A is unavailable. This part meets the 30 V voltage requirement and 100 nA dark current specification. However, three constraints apply: (1) wavelength operates at 940nm rather than 935nm, representing a 5nm shift that may affect system spectral response; (2) operating temperature range is limited to -40°C to 85°C, excluding the lower -55°C extreme temperature operation of the original; (3) package configuration is Radial rather than Coaxial Metal Can, requiring mechanical board layout verification. The LTR-3208E is ROHS3 compliant and REACH Unaffected with Active product status.

Compliance and Regulatory Status

Both substitute parts exceed the RoHS compliance level of the original SD1440-004, carrying ROHS3 certification. Both are REACH Unaffected. Selection between OP516A and LTR-3208E should prioritize application requirements regarding wavelength precision, temperature extremes, and mechanical packaging constraints.

Frequently Asked Questions (FAQ)

Q: Can OP516A directly replace SD1440-004 without circuit modification?

A: Yes. The OP516A maintains identical electrical ratings (30 V Collector Emitter Breakdown, 100 nA dark current specification), wavelength (935nm), package type (Coaxial Metal Can), and operating temperature range (-55°C to 125°C). Direct pin-for-pin substitution is applicable without circuit redesign.

Q: What is the impact of the 5nm wavelength difference between SD1440-004 (935nm) and LTR-3208E (940nm)?

A: The 5nm wavelength shift from 935nm to 940nm represents a 0.5% spectral displacement. Applications with narrow-band spectral filtering or precise wavelength-dependent response curves may experience measurable performance variation. Applications with broad spectral acceptance typically tolerate this variance. System-level spectral response testing is necessary to confirm compatibility in wavelength-critical applications.

Q: Is the LTR-3208E suitable for applications requiring -55°C operation?

A: No. The LTR-3208E operating temperature range is -40°C to 85°C, which does not extend to the -55°C minimum of the original SD1440-004. Applications requiring full -55°C to 125°C operation must use OP516A or equivalent parts with matching temperature specifications.

Q: What mechanical considerations apply when substituting LTR-3208E for SD1440-004?

A: The LTR-3208E uses a Radial package configuration, while SD1440-004 uses Coaxial Metal Can. Radial packages have leads extending from the component body in different geometric patterns than coaxial designs. Board layout, lead spacing, and mounting hole positioning must be verified for mechanical compatibility. Coaxial packages are preferred for direct substitution to eliminate mechanical redesign.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both OP516A and LTR-3208E carry ROHS3 certification, exceeding the RoHS compliance level of the original SD1440-004. Both parts are REACH Unaffected, meeting current regulatory requirements for European and international markets.

Q: What is the inventory status of substitute parts?

A: OP516A maintains 8,976 pieces in stock (Active product status). LTR-3208E maintains 39,084 pieces in stock (Active product status). Both parts have established supply chains with multiple distributors, ensuring availability for production and maintenance applications.

Q: Can I use LTR-3208E in a design originally specified for SD1440-004?

A: Conditional substitution is possible with engineering verification. The LTR-3208E meets voltage and dark current specifications but introduces three variables: 5nm wavelength shift, reduced temperature range (-40°C to 85°C maximum), and different package geometry (Radial vs. Coaxial). Applications operating within -40°C to 85°C with broad spectral tolerance and mechanical redesign capability can accommodate LTR-3208E. Applications requiring full temperature range or wavelength precision must use OP516A.