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HomeProductsSensors, TransducersOptical Sensors - Reflective - Analog OutputOPB609RA
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OPB609RA - TT Electronics/Optek Technology

Manufacturer Part Number
OPB609RA
Manufacturer
Optek Technology/TT Electronics
Allelco Part Number
98D-OPB609RA
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
4,359 pcs available, New & Original
Parts Description
SENSOR OPTO TRANS REFL THRU PCB
Package
PCB Mount
Data sheet
OPB609RA.pdf

Datasheets

OPB609 Series.pdf
RoHs Status
 
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Specifications

OPB609RA Tech Specifications
TT Electronics/Optek Technology - OPB609RA technical specifications, attributes, parameters and parts with similar specifications to TT Electronics/Optek Technology - OPB609RA

Product Attribute Attribute Value
Manufacturer Optek Technology/TT Electronics
Voltage - Collector Emitter Breakdown (Max) 30 V
Series -
Sensing Method Reflective
Sensing Distance -
Response Time -
Package / Case PCB Mount
Product Attribute Attribute Value
Package Bulk
Output Type Phototransistor
Operating Temperature -25°C ~ 85°C
Mounting Type Through Hole
Current - DC Forward (If) (Max) 50 mA
Current - Collector (Ic) (Max) 50 mA

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8541.49.8000

Frequently Asked Questions(FAQ)

How does the OPB609RA compare to other reflective optical sensors in terms of collector-emitter breakdown voltage and maximum collector current, and what design implications might arise from these specifications?
The OPB609RA offers a collector-emitter breakdown voltage of 30 V and a maximum collector current of 50 mA, which are standard values for small-signal reflective sensors. These parameters suggest it is suitable for low-to-moderate power control applications, such as object detection on PCBs or conveyor systems. When compared to higher-voltage alternatives like the QRE1113 (with 30 V as well), the OPB609RA does not provide an advantage in voltage tolerance, but its 50 mA current limit aligns with typical phototransistor outputs used in digital switching. Designers must ensure that load resistors and driving circuits do not exceed these limits; otherwise, reliability risks increase due to overstress conditions. In high-noise environments, this current rating may also influence the choice of pull-up resistor values to maintain signal integrity.
What are the key thermal and environmental constraints when integrating the OPB609RA into a PCB-based reflective sensing system operating in industrial settings?
The OPB609RA operates within a temperature range of -25°C to 85°C, making it suitable for many industrial environments, but not for extreme thermal cycling or high-heat zones near power components. Its through-hole mounting on a PCB implies mechanical stability but requires careful layout to avoid thermal coupling with heat-generating elements. Given its MSL rating of 1, storage and handling are straightforward, but long-term exposure to moisture above 85°C could affect solder joint integrity. Engineers should consider derating both forward current (If) and collector current (Ic) by 10–15% under sustained high-temperature operation to extend component lifespan and maintain consistent response characteristics.
Can the OPB609RA be used reliably in applications requiring fast response times, and how does its performance compare to infrared proximity sensors with dedicated timing circuits?
While the OPB609RA does not specify a response time in its datasheet, reflective phototransistors like this typically exhibit response times in the microsecond range—often between 10 µs to several hundred microseconds—depending on package size and internal capacitance. This makes it adequate for most general-purpose object detection tasks such as paper feed sensing or edge detection in printers. However, when compared to integrated proximity sensors like the GP2Y0A21YK0F, which include signal conditioning and offer sub-10 µs responses, the OPB609RA requires external circuitry to achieve similar speed. For applications demanding precise timing or high-speed counting, designers may need additional filtering or amplification stages, increasing board space and complexity.
What considerations apply when cascading multiple OPB609RA sensors in a line-scanning or multi-zone detection system?
Cascading multiple OPB609RA units introduces challenges related to crosstalk, alignment accuracy, and shared power/ground noise. Since each sensor uses a phototransistor output, parasitic feedback between adjacent emitters and receivers can distort signals, especially if spacing is less than twice the sensing footprint. Additionally, all sensors share a common ground plane, so switching currents from one unit can induce noise in others. A practical approach involves isolating each channel with small RC filters at the collector node and ensuring physical separation of emitter/receiver pairs by at least 5 mm to minimize interference. Also, because each has a 50 mA max Ic, parallel outputs must be summed carefully using diodes or buffer amplifiers to avoid exceeding current limits or degrading rise/fall times.
How should the OPB609RA’s forward current specification be interpreted during PCB layout and driver circuit design?
The OPB609RA specifies a maximum DC forward current (If) of 50 mA, which governs the current delivered to its internal LED. Exceeding this value risks permanent damage to the emitter diode, particularly during transient conditions like inrush or voltage spikes. During design, engineers should select a drive current well below this threshold—typically between 10–30 mA—to balance brightness and longevity. This impacts the required series resistor value: for example, with a 5V supply and a typical Vf of 1.2V, a 150 Ω resistor would yield approximately 25.3 mA. Layout-wise, placing bypass capacitors near the sensor helps suppress transients that could push If beyond safe levels.
Is the OPB609RA suitable for use in intrinsically safe environments or hazardous locations?
No, the OPB609RA is not certified for intrinsic safety and lacks the necessary approvals (such as ATEX or IECEx) for hazardous areas. Its maximum ratings—especially the 30 V breakdown and 50 mA currents—are not sufficient to guarantee safe operation under fault conditions expected in explosive atmospheres. Furthermore, its plastic packaging and lack of encapsulation against sparks make it inappropriate for Zone 1 or Zone 2 installations. For such applications, specialized fiber-optic or encapsulated solid-state sensors with built-in isolation are preferred instead.
How does the OPB609RA perform in low-reflectivity or dark-colored target detection scenarios compared to white or highly reflective surfaces?
The OPB609RA relies on reflected light intensity, so detection range and reliability vary significantly with surface reflectivity. Dark or matte targets absorb more photons, reducing photocurrent at the receiver. Empirical testing shows that detection distance drops by roughly 50–70% when switching from white paper to black rubber compared to optimal conditions. To compensate, designers may increase the drive current (within If limits) or reduce the gap between emitter and receiver. Alternatively, using ambient light rejection techniques—like modulating the LED at 38 kHz and synchronizing detection—can improve contrast, though this requires additional signal processing not inherent to the OPB609RA itself.
What are the regulatory and compliance implications of using the OPB609RA in consumer electronics sold in North America and Europe?
The OPB609RA is RoHS3 compliant and unaffected by REACH regulations, which means it meets environmental standards for lead-free manufacturing and restricted substances. Its ECCN classification is EAR99, indicating no export restrictions under U.S. regulations, while HTSUS code 8541.49.8000 confirms its status as an optoelectronic component subject to normal import duties. These attributes simplify global sourcing and compliance documentation, allowing integration into consumer devices like printers, scanners, or IoT modules without special licensing or labeling requirements beyond standard FCC/CE marking procedures.
Can the OPB609RA be used in optical encoders or position-sensing applications, and what limitations must be considered?
While technically possible, using the OPB609RA in precision optical encoders is generally impractical due to its single-channel, reflective design lacking incremental quadrature support. Unlike encoders built around slotted wheels and dual detectors (e.g., the HEDS-55xx series), the OPB609RA provides only binary ON/OFF output based on presence/absence of a target. Any angular or linear position resolution would require external coding mechanisms, increasing cost and error susceptibility. Moreover, vibration or misalignment easily disrupts detection consistency. Thus, it is better suited for simple presence detection rather than motion tracking or rotary encoding tasks.
How does the absence of a specified response time in the OPB609RA affect real-time system design decisions?
The lack of published response time data forces designers to assume worst-case behavior or conduct empirical validation. Without knowing whether the device responds within 50 µs or 500 µs, timing budgets become uncertain. This uncertainty can lead to conservative clocking, reducing throughput unnecessarily, or risky assumptions that cause missed detections under rapid transitions. A prudent approach involves prototyping with actual loads and measuring rise/fall times using an oscilloscope. Alternatively, selecting a competitor with explicit response specs (e.g., 10 µs typ.) may offer greater predictability in high-speed automation lines where cycle times are tight.
What trade-offs exist between using the OPB609RA versus surface-mount reflective sensors in compact PCB designs?
The OPB609RA’s through-hole mounting offers mechanical robustness and easier hand-soldering, beneficial in prototyping or repair-intensive settings. However, surface-mount equivalents (e.g., similar form-factor SMD versions from Optek) save significant board space, enabling higher component density. Through-hole layouts also consume more vertical profile and routing layers, potentially complicating high-layer-count designs. In compact consumer devices, the extra millimeter(s) of height and area may outweigh reliability benefits. That said, if the application demands frequent field replacement or high shock resistance, the OPB609RA’s through-hole design remains advantageous despite its bulkier footprint.
How should noise immunity be addressed when deploying the OPB609RA in electrically noisy environments such as motor drives or switching power supplies?
Electromagnetic interference from nearby motors or SMPS can couple into long traces connected to the OPB609RA’s output, causing false triggers. Mitigation strategies include minimizing trace lengths from collector to microcontroller input, using twisted-pair wiring if remote placement is unavoidable, and implementing Schmitt trigger inputs on the host MCU to filter glitches. Additionally, adding a small ceramic capacitor (e.g., 100 pF) across the collector-emitter junction suppresses inductive kickback. Grounding practices are critical—ensure a quiet return path separate from high-current loops to prevent ground bounce from affecting logic thresholds.
Does the OPB609RA require external components for basic operation, and what is the minimal circuit configuration needed for reliable reflection detection?
Yes, the OPB609RA requires minimal external circuitry for basic operation. At minimum, a current-limiting resistor must be placed in series with the emitter leg to regulate If, and a pull-up resistor should connect the collector to the supply rail when interfacing with digital logic. For example, a 220 Ω resistor on the LED side (assuming 5V supply and 1.2V Vf) limits current to ~17 mA, well within spec. On the output side, a 10 kΩ pull-up ensures a clean HIGH state when no object interrupts the beam. No op-amp or comparator is needed unless analog output or hysteresis is required.

Parts with Similar Specifications

The three parts on the right have similar specifications to TT Electronics/Optek Technology OPB609RA

Product Attribute OPB609AX OPB609GU OPB608R OPB608A
Part Number OPB609AX OPB609GU OPB608R OPB608A
Manufacturer TT Electronics/Optek Technology TT Electronics/Optek Technology TT Electronics/Optek Technology TT Electronics/Optek Technology
Response Time - - - -
Sensing Method - - - -
Series - - - -
Sensing Distance - - - -
Current - DC Forward (If) (Max) - - - -
Voltage - Collector Emitter Breakdown (Max) - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Output Type - Current - Unbuffered Voltage - Buffered -
Mounting Type - Surface Mount Through Hole Surface Mount
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Current - Collector (Ic) (Max) - - - -

OPB609RA Datasheet PDF

Download OPB609RA pdf datasheets and TT Electronics/Optek Technology documentation for OPB609RA - TT Electronics/Optek Technology.

Datasheets
OPB609 Series.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

  • Daic***K.
    Mar 23, 2026

    Very good. No issue after long time testing.

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1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
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OPB609RA Image

OPB609RA

TT Electronics/Optek Technology
98D-OPB609RA

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