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LR36688U
Sharp Microelectronics
SENSOR OPT
105401 Pcs New Original In Stock
Optical Sensor
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(Ships tomorrow)
*Quantity
Minimum 1
Minimum 1
5.0 / 5.0
- (383 Ratings)
LR36688U
Product Overview
7924233
DiGi Electronics Part Number
LR36688U-DGManufacturer
Sharp Microelectronics
LR36688U
Description
SENSOR OPTInventory
105401 Pcs New Original In Stock
Optical Sensor
Quantity
Minimum 1
Minimum 1
Purchase and inquiry
Warranty & Returns
How to Order
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LR36688U Technical Specifications
Category
Optical Sensors, Ambient Light, IR, UV Sensors
Packaging
-
Series
*
Product Status
Obsolete
Datasheet & Documents
HTML Datasheet
LR36688U-DG
Environmental & Export Classification
Moisture Sensitivity Level (MSL)
1 (Unlimited)
ECCN
EAR99
HTSUS
8541.49.8000
Additional Information
Standard Package
1
Reviews
5.0/5.0-(Show up to 5 Ratings)
December 02, 2025
구매 후 지원이 아주 체계적이고, 고객을 편하게 하는 서비스 덕분에 계속 이용 중입니다.
December 02, 2025
Their reliable delivery and responsive support team give me peace of mind every time I place an order.
December 02, 2025
I am impressed by how quickly they respond to inquiries after purchase, showing excellent customer care.
December 02, 2025
Customer care at DiGi Electronics is top-notch, making me feel valued as a customer.
December 02, 2025
I felt valued as a customer thanks to their attentive and proactive support.
December 02, 2025
Post-sale support was thorough, addressing all my needs promptly.
December 02, 2025
Their logistics team ensured my order was delivered promptly and securely.
December 02, 2025
Every delivery has arrived swiftly, reflecting their commitment to efficiency.
December 02, 2025
Their team consistently provides detailed advice that makes a real difference.
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Frequently Asked Questions (FAQ)
Can the Sharp Microelectronics LR36688U optical sensor be used as a direct replacement for the Vishay TCST1103 in a reflective object detection application, and what design adjustments might be needed?
While both the LR36688U and Vishay TCST1103 are reflective optical sensors, they are not pin-for-pin compatible due to differences in internal circuitry, output configuration, and optical alignment. The LR36688U has an integrated phototransistor and LED in a single package with specific spectral response and viewing angle characteristics that differ from the TCST1103. If substituting, you must verify the output signal level under your operating conditions, adjust pull-up resistor values if necessary, and ensure mechanical alignment matches the LR36688U’s narrower emission/detection pattern. Additionally, since the LR36688U is obsolete, long-term supply risk should be evaluated before design-in.
What are the key reliability risks when designing with the obsolete Sharp LR36688U optical sensor in a high-humidity industrial environment, despite its MSL 1 rating?
Although the LR36688U carries an MSL 1 (unlimited floor life) rating, its obsolescence introduces significant reliability risks unrelated to moisture sensitivity. These include potential degradation of internal bonding or encapsulant materials over time due to aging, lack of manufacturer support for failure analysis, and absence of updated qualification data. In high-humidity environments, even minor package microcracks—more likely in older stock—can lead to corrosion or leakage currents. Recommend implementing conformal coating, rigorous incoming inspection, and designing with redundant sensing or field-replaceable modules to mitigate field failure risks.
How does the spectral response of the LR36688U compare to modern alternatives like the Omron B5W-LB1112-1, and could this affect performance in outdoor applications with ambient sunlight?
The LR36688U uses a standard GaAs-based IR LED with peak emission around 940 nm and a silicon phototransistor detector, which is susceptible to interference from sunlight containing strong IR components. In contrast, the Omron B5W-LB1112-1 employs a filtered optical system optimized to reject ambient light, including visible and near-IR solar radiation. If deploying the LR36688U outdoors, you must implement modulation (e.g., 38 kHz carrier) and synchronous detection to reject ambient noise—a technique not required with newer ambient-light-immune sensors. Without such measures, false triggers or reduced sensing range are likely under direct sunlight.
Is it safe to source the LR36688U from third-party distributors given its obsolete status, and what verification steps should I take to avoid counterfeit or degraded units?
Sourcing the LR36688U from third-party distributors carries elevated risk due to its obsolete status and lack of active manufacturing support. Counterfeit, relabeled, or long-stored units may exhibit parametric drift or physical defects. Always request full traceability documentation (original Sharp batch codes, date codes within 5 years), perform electrical characterization (e.g., LED forward voltage, phototransistor dark/light current), and conduct optical alignment tests under your actual operating conditions. Whenever possible, buy only from authorized distributors with anti-counterfeit programs or consider qualifying a modern alternative to eliminate supply-chain uncertainty.
What PCB layout and thermal considerations are critical when integrating the LR36688U into a compact consumer device with limited airflow?
The LR36688U’s performance is sensitive to thermal buildup because elevated temperatures increase the phototransistor’s dark current, reducing signal-to-noise ratio and potentially causing false detections. In compact designs, avoid placing heat-generating components (e.g., power regulators) nearby, and ensure adequate clearance around the sensor to maintain natural convection. Use thermal vias under the package if mounted on a multilayer board, but avoid large copper pours directly under the optical window that could cause warpage or misalignment. Also, maintain a clean, non-reflective PCB surface around the sensor to prevent unintended internal reflections that degrade sensing accuracy.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
LR36688U CAD Models
Sharp Microelectronics LR36688U PCB symbols & footprints
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