AFBR-S4K33C0147L Equivalent & Substitute Parts

Part Overview

The AFBR-S4K33C0147L is a photodiode optical sensor manufactured by Broadcom Limited, designed for 430nm wavelength detection in a 12-WFBGA surface mount package. This avalanche photodiode features an active area of 9mm² and operates across a temperature range of -40°C to 60°C with a maximum reverse voltage of 30.25V.

The part is designated as Last Time Buy, indicating that production has been discontinued and existing inventory is limited. This status necessitates identification of equivalent substitute components to ensure design continuity and long-term supply chain reliability for applications currently utilizing this sensor.

Substiute Parts

AFBR-S4K33C0147L

Broadcom LimitedIn Stock: 1247AFBR-S4K33C0147L Datasheet

Current PartRFQ

AFBR-S4N44P014M

Broadcom LimitedIn Stock: 1046AFBR-S4N44P014M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AFBR-S4K33C0147L is determined by the following critical parameters:

Primary Substitution Criteria:

• Manufacturer: Broadcom Limited (same manufacturer ensures design compatibility and performance consistency)
• Wavelength Range: 420nm to 430nm (narrow spectral window for blue light detection applications)
• Mounting Type: Surface Mount (maintains PCB assembly compatibility)
• RoHS Compliance: ROHS3 Compliant (regulatory requirement consistency)

Secondary Compatibility Factors:

• Active Area: Comparable sensor active area to maintain optical coupling efficiency
• Operating Temperature Range: Overlap with original specification to ensure functional operation across intended environments
• Reverse Voltage Rating: Sufficient voltage capability for circuit design requirements
• Package Type: Surface mount configurations that integrate with existing board layouts

The AFBR-S4N44P014M qualifies as a manufacturer-recommended substitute based on these parameters, despite differences in package form factor and certain electrical characteristics.

Parameter Comparison

Engineering Selection Recommendations

AFBR-S4N44P014M Selection Basis:

The AFBR-S4N44P014M is designated as the manufacturer-recommended substitute for the AFBR-S4K33C0147L. This recommendation is supported by the following engineering factors:

Compliance and Regulatory Alignment: Both components maintain ROHS3 compliance, ensuring consistency with environmental and regulatory requirements across design iterations.

Product Lifecycle Status: The substitute part carries Active product status, providing assured long-term availability and supply chain stability compared to the Last Time Buy status of the original component. This transition addresses the primary concern of component obsolescence.

Optical Specifications: Both sensors operate within the blue light detection spectrum (420nm to 430nm), maintaining functional equivalence for applications requiring short-wavelength photodiode sensing. The substitute's broader spectral range (250nm to 900nm) provides extended capability without compromising the primary 420nm operating point.

Electrical Characteristics: The substitute operates at a lower maximum reverse voltage (16V versus 30.25V), which requires circuit design verification to ensure compatibility with existing bias networks. The higher typical dark current (3.3µA versus 207nA to 1.8µA) may impact noise performance in low-light applications and should be evaluated against system sensitivity requirements.

Thermal Operating Range: The substitute's operating temperature range (-20°C to 60°C) overlaps the original specification across the upper temperature boundary. Applications requiring operation below -20°C require alternative component selection.

Packaging Considerations: The transition from 12-WFBGA to Single Element packaging necessitates PCB layout and optical coupling redesign. The larger active area (13.47mm² versus 9mm²) may improve light collection efficiency but requires mechanical integration assessment.

Frequently Asked Questions (FAQ)

Q: Can the AFBR-S4N44P014M directly replace the AFBR-S4K33C0147L without circuit modifications?

A: No. While both components are Broadcom photodiodes operating in the blue spectrum, the substitute requires circuit redesign due to lower maximum reverse voltage (16V versus 30.25V), different package form factor (Single Element versus 12-WFBGA), and higher dark current characteristics. Bias network and optical coupling must be re-evaluated.

Q: What is the wavelength difference between these two sensors, and does it affect application performance?

A: The wavelength difference is 10nm (430nm main part versus 420nm substitute). Both wavelengths fall within the blue light spectrum. Application impact depends on the spectral characteristics of the target light source and optical filter specifications. Systems with narrow-band optical filters centered on 430nm may require filter adjustment.

Q: Why does the substitute have a larger active area?

A: The AFBR-S4N44P014M features a 13.47mm² active area compared to the 9mm² of the original component. This larger sensing area may provide improved light collection efficiency but requires mechanical redesign of the optical coupling system and PCB mounting configuration.

Q: Is the moisture sensitivity difference significant for assembly and storage?

A: Yes. The main part has MSL 1 (Unlimited shelf life), while the substitute has MSL 2A (4-week moisture absorption limit). The substitute requires controlled storage conditions and has a defined bake-out procedure before reflow soldering. Assembly processes must incorporate moisture management protocols.

Q: What is the impact of the lower maximum reverse voltage on circuit design?

A: The substitute's 16V maximum reverse voltage is substantially lower than the original 30.25V specification. Existing bias circuits designed for higher voltage operation must be redesigned to operate within the 16V limit. Exceeding this voltage rating will damage the component.

Q: Can the AFBR-S4N44P014M operate at -40°C like the original part?

A: No. The substitute's minimum operating temperature is -20°C, which is 20°C higher than the original specification. Applications requiring operation at -40°C cannot use this substitute without alternative component selection.

Q: How does the dark current difference affect system noise performance?

A: The substitute exhibits higher typical dark current (3.3µA versus 207nA to 1.8µA). This increased dark current contributes to shot noise and reduces signal-to-noise ratio in low-light detection applications. System sensitivity analysis is required to determine if this performance degradation is acceptable for the intended application.

Q: Are there any other Broadcom photodiode alternatives to consider?

A: The provided substitute list contains only the AFBR-S4N44P014M as the manufacturer-recommended equivalent. Additional alternatives may exist within the Broadcom optical sensor portfolio, but they are not included in this reference documentation.