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SI1141-A10-GMR
Electronics Part Number
SI1141-A10-GMR-WXManufacturer
Vishay Semiconductor - Opto Division
SI1141-A10-GMR
Description
Ambient/UV Optical Sensor, 10QFNInventory
720 Pcs New Original In Stock
I2C ambient light sensor in compact 10-WFQFN package for energy-efficient display backlight control and automatic brightness sensing.
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Basic cost: USD 70.00
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Technical Specifications
Category
Optical Sensors, Photo Detectors - Remote Receiver
Manufacturer
Vishay Semiconductor - Opto Division
Packaging
Tube
Operating Temperature
-25°C ~ 85°C
Mounting Type
Through Hole
Series
-
Base Product Number
TSOP34840
Product Status
Active
Current - Supply
350 µA
Voltage - Supply
2.5 V ~ 5.5 V
Orientation
Side View
Sensing Distance
45m
B.P.F. Center Frequency
40.0kHz
Data Sheet Document (D)
Datasheets
Download TSOP34840 Product Specification (PDF)
HTML Datasheet
TSOP34840-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8541.49.9500
Additional Information
Standard Package
90
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Frequently Asked Questions (FAQ)
What are the key design risks when replacing a TSOP34840 with a surface-mount alternative like the V
Replacing the through-hole TSOP34840 with the surface-mount TSOP4840 introduces mechanical and electrical integration challenges. The TSOP4840 has a different pinout and footprint, requiring PCB rework or an adapter board, which can compromise signal integrity due to added parasitics. Additionally, the TSOP4840 has a narrower viewing angle (typically ±30° vs. ±45° for TSOP34840), potentially reducing remote control reliability in off-axis use cases. Always verify alignment tolerance and consider adding shielding or optical baffles to maintain performance in high-ambient-light environments.
How does ambient sunlight affect the reliability of the TSOP34840 in outdoor applications, and what
The TSOP34840, while sensitive to 40 kHz modulated IR signals, is highly susceptible to interference from direct or reflected sunlight, which contains broad-spectrum IR that can saturate the receiver. This can cause false triggering or complete signal blocking. To mitigate, use a mechanical sunshade or optical filter tuned to 850–950 nm, ensure the sensor is recessed in a light-tight housing, and implement software debouncing or signal validation in the host microcontroller. Testing under worst-case solar irradiance (e.g., midday direct exposure) is essential for outdoor designs.
Can the TSOP34840 be safely used with non-standard remote controls that modulate at 38 kHz instead o
Using the TSOP34840 with a 38 kHz remote results in significantly reduced sensitivity due to the 5% frequency offset from its 40 kHz bandpass filter center. While short-range operation (under 5 meters) may still function, effective range drops sharply, and reliability degrades in noisy environments. For consistent performance, pair the TSOP34840 only with 40 kHz transmitters. If 38 kHz is unavoidable, consider the TSOP38238 (also from Vishay), which is optimized for 38 kHz and offers better noise immunity in mixed-frequency environments.
What supply voltage stability is required for the TSOP34840 in battery-powered designs, and how does
The TSOP34840 operates from 2.5 V to 5.5 V, but supply noise directly affects internal AGC (automatic gain control) performance. Voltage ripple above 50 mVpp from switching regulators or long battery leads can desensitize the receiver, reducing effective range by up to 30%. Use a low-noise LDO (e.g., TPS7A02) instead of a buck converter, and include a 100 nF ceramic capacitor within 5 mm of the VCC pin. For coin-cell applications, ensure ESR remains low across temperature to avoid brownout during peak current demand.
Is the TSOP34840 suitable for industrial environments with high electromagnetic interference (EMI),
The TSOP34840 lacks built-in EMI hardening, making it vulnerable to conducted and radiated noise from motors, relays, or switching power supplies. In industrial settings, route signal traces away from high-current paths, use a ground plane under the sensor, and add a small ferrite bead (e.g., Murata BLM18AG102SN1) on the output line. Shielding the sensor with grounded metal or conductive paint improves resilience. Always validate performance under real-world EMI conditions—consider the TSOP34840's 350 µA low current draw a benefit for noise-sensitive systems, but not a substitute for proper layout and filtering.
What are the key design risks when replacing a TSOP34840 with a surface-mount alternative like the V
Replacing the through-hole TSOP34840 with the surface-mount TSOP4840 introduces mechanical and electrical integration challenges. The TSOP4840 has a different pinout and footprint, requiring PCB rework or an adapter board, which can compromise signal integrity due to added parasitics. Additionally, the TSOP4840 has a narrower viewing angle (typically ±30° vs. ±45° for TSOP34840), potentially reducing remote control reliability in off-axis use cases. Always verify alignment tolerance and consider adding shielding or optical baffles to maintain performance in high-ambient-light environments.
How does ambient sunlight affect the reliability of the TSOP34840 in outdoor applications, and what
The TSOP34840, while sensitive to 40 kHz modulated IR signals, is highly susceptible to interference from direct or reflected sunlight, which contains broad-spectrum IR that can saturate the receiver. This can cause false triggering or complete signal blocking. To mitigate, use a mechanical sunshade or optical filter tuned to 850–950 nm, ensure the sensor is recessed in a light-tight housing, and implement software debouncing or signal validation in the host microcontroller. Testing under worst-case solar irradiance (e.g., midday direct exposure) is essential for outdoor designs.
Can the TSOP34840 be safely used with non-standard remote controls that modulate at 38 kHz instead o
Using the TSOP34840 with a 38 kHz remote results in significantly reduced sensitivity due to the 5% frequency offset from its 40 kHz bandpass filter center. While short-range operation (under 5 meters) may still function, effective range drops sharply, and reliability degrades in noisy environments. For consistent performance, pair the TSOP34840 only with 40 kHz transmitters. If 38 kHz is unavoidable, consider the TSOP38238 (also from Vishay), which is optimized for 38 kHz and offers better noise immunity in mixed-frequency environments.
What supply voltage stability is required for the TSOP34840 in battery-powered designs, and how does
The TSOP34840 operates from 2.5 V to 5.5 V, but supply noise directly affects internal AGC (automatic gain control) performance. Voltage ripple above 50 mVpp from switching regulators or long battery leads can desensitize the receiver, reducing effective range by up to 30%. Use a low-noise LDO (e.g., TPS7A02) instead of a buck converter, and include a 100 nF ceramic capacitor within 5 mm of the VCC pin. For coin-cell applications, ensure ESR remains low across temperature to avoid brownout during peak current demand.
Is the TSOP34840 suitable for industrial environments with high electromagnetic interference (EMI),
The TSOP34840 lacks built-in EMI hardening, making it vulnerable to conducted and radiated noise from motors, relays, or switching power supplies. In industrial settings, route signal traces away from high-current paths, use a ground plane under the sensor, and add a small ferrite bead (e.g., Murata BLM18AG102SN1) on the output line. Shielding the sensor with grounded metal or conductive paint improves resilience. Always validate performance under real-world EMI conditions—consider the TSOP34840's 350 µA low current draw a benefit for noise-sensitive systems, but not a substitute for proper layout and filtering.
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Sep 15 2026
