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HomeProductsSensors, TransducersOptical Sensors - Reflective - Analog OutputOPB608R
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OPB608R - TT Electronics/Optek Technology

Manufacturer Part Number
OPB608R
Manufacturer
Optek Technology/TT Electronics
Allelco Part Number
32D-OPB608R
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
4,470 pcs available, New & Original
Parts Description
SENSR OPTO TRANS 1.27MM REFL PCB
Package
PCB Mount
Data sheet
OPB608R.pdf

Datasheets

OPB608A,B,C,R,V.pdf

PCN Design/Specification

Phototransistor Update 09/Mar/2015.pdf
RoHs Status
RoHS Compliant
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Our certification
In stock: 4470
  • Unit Price: $3.282
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $3.282 $3.28
200+ $1.31 $262.00
500+ $1.267 $633.50
1000+ $1.245 $1,245.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

OPB608R Tech Specifications
TT Electronics/Optek Technology - OPB608R technical specifications, attributes, parameters and parts with similar specifications to TT Electronics/Optek Technology - OPB608R

Product Attribute Attribute Value
Manufacturer Optek Technology/TT Electronics
Voltage - Collector Emitter Breakdown (Max) 30 V
Series -
Sensing Method Reflective
Sensing Distance 0.050" (1.27mm)
Response Time -
Package / Case PCB Mount
Product Attribute Attribute Value
Package Bulk
Output Type Phototransistor
Operating Temperature -40°C ~ 85°C
Mounting Type Through Hole
Current - DC Forward (If) (Max) 50 mA
Current - Collector (Ic) (Max) 25 mA
Base Product Number OPB608

Environmental & Export Classifications

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

Frequently Asked Questions(FAQ)

What is the maximum collector current rating and how does it affect circuit design when using the OPB608R reflective optical sensor in a high-speed detection application?
The OPB608R has a maximum collector current (Ic) of 25 mA, which defines the upper limit for the phototransistor output stage. In practical circuit implementations, this parameter directly influences load selection and series resistance values. For example, driving an LED with a forward voltage of 2.1 V at 10 mA would require approximately (3.3 V - 2.1 V)/10 mA = 120 Ω, well within the OPB608R’s capability. Exceeding 25 mA may cause thermal degradation or permanent damage, especially under continuous operation near ambient temperature extremes like 85°C. Designers must ensure total power dissipation remains below safe limits while maintaining sufficient margin for reliability.
How does the OPB608R compare to similar through-hole reflective sensors like the OPB608A or OPB704 when considering response time and noise immunity in industrial environments?
While the OPB608R shares the same base product number as the OPB608A and both feature phototransistor outputs, the OPB608R typically exhibits slightly slower response characteristics due to its PCB-mount design and internal layout constraints compared to surface-mount variants. It also lacks the integrated signal conditioning found in newer models like the OPB704. In noisy environments, the OPB608R benefits from its 1.27 mm sensing distance, which helps reject ambient light interference—but it offers inferior noise filtering compared to devices with built-in amplifiers. Thus, for applications requiring sub-100 µs response times or strong EMI resilience, alternative designs such as the OPB704 may be more suitable despite higher cost.
Can the OPB608R reliably operate over the full industrial temperature range (-40°C to 85°C), and what are the implications for long-term drift in threshold detection circuits?
Yes, the OPB608R is specified for operation across -40°C to 85°C, making it appropriate for most industrial control systems. However, at elevated temperatures, the dark current of the phototransistor increases significantly—often doubling between room temperature and 85°C. This can reduce effective sensitivity by shifting the turn-on point of detection thresholds. For instance, a system calibrated at 25°C might experience false triggers or missed detections if not compensated for thermal drift. Designers should include hysteresis in comparator stages or use temperature-stable reference voltages when implementing precision edge detection with the OPB608R.
What mounting configuration and footprint considerations apply when integrating the OPB608R into a double-sided PCB assembly process?
The OPB608R uses a standard 0.050" (1.27 mm) pitch through-hole mount, compatible with conventional DIP-style layouts. Its package is designed for direct insertion into plated through holes without requiring additional standoffs. When used on double-sided PCBs, alignment tolerances must account for solder paste deposition and component height to avoid bridging between layers. The MSL rating of 1 indicates unlimited shelf life before reflow, simplifying inventory management. However, wave soldering requires careful flux selection to prevent oxidation during prolonged exposure above 235°C.
How does the collector-emitter breakdown voltage (30 V max) influence optocoupler isolation choices when replacing discrete components in legacy motor control circuits?
Although the OPB608R is not an optocoupler, its 30 V collector-emitter breakdown voltage allows it to interface directly with 24 V industrial logic levels without external clamping diodes. In contrast, true optocouplers like the 4N25 offer galvanic isolation up to several kilovolts—critical in hazardous environments. If isolation is required, designers must add discrete isolation barriers or choose dedicated opto-isolators instead of relying solely on the OPB608R. Using the OPB608R in non-isolated feedback loops simplifies circuitry but forfeits electrical separation, increasing risk during maintenance or fault conditions.
What are the typical forward current requirements for the emitter side of the OPB608R, and how should driver circuitry be designed to maintain efficiency over time?
The OPB608R specifies a maximum DC forward current (If) of 50 mA per channel. In practice, operating at 20–30 mA provides optimal balance between brightness and lifespan. A simple resistor-based driver using a 5 V supply would draw approximately (5 V - 1.2 V)/25 mA ≈ 152 Ω, resulting in ~0.4 W power dissipation per emitter. To improve efficiency, pulsed operation at lower duty cycles can extend LED life while maintaining average illumination. Thermal vias under the device package help dissipate heat, but cumulative junction heating over years may still reduce emission intensity gradually.
Is the OPB608R RoHS compliant, and what documentation supports its use in EU-certified consumer electronics projects?
The OPB608R is fully RoHS3 compliant, meaning it meets all European Union directives including restrictions on lead, mercury, cadmium, and other restricted substances. Its REACH status is unaffected, indicating no SVHC (substance of very high concern) content above regulatory thresholds. Documentation includes full material declarations and compliance certificates available through TT Electronics/Optek Technology. This ensures the component can be legally incorporated into finished products destined for the European market without additional testing or exemptions.
How does moisture sensitivity level (MSL 1) impact storage and handling procedures for bulk-packaged OPB608R units?
With an MSL rating of 1, the OPB608R is considered non-hygroscopic and immune to moisture-induced failures during normal storage. No bake-out cycles are required prior to assembly, even after extended periods. Bulk packaging reduces handling steps and minimizes contamination risk compared to tape-and-reel formats. However, operators should still follow ESD precautions during manual placement, as static discharge can damage sensitive semiconductor junctions despite the robust packaging.
What is the significance of the 1.27 mm sensing distance in practical reflective encoding applications, and how does it compare to shorter-range alternatives?
The 1.27 mm sensing distance of the OPB608R enables reliable detection of small reflective markers on printed circuit boards or mechanical parts without physical contact. Compared to sensors with 0.5 mm ranges, it offers greater tolerance for misalignment and surface irregularities. However, it trades off spatial resolution for robustness—ideal for slot detection in rotary encoders or presence/absence checks in conveyor systems. Shorter distances like those in OPB350 variants provide faster response but demand tighter manufacturing tolerances, making the OPB608R preferable where mechanical stability outweighs speed requirements.
Does the OPB608R support bidirectional data transmission, and what limitations exist regarding modulation schemes?
No, the OPB608R operates unidirectionally—emitting infrared light and detecting reflected photons via a phototransistor. It cannot transmit data back through the same path. For bidirectional communication, separate transmitter and receiver pairs are needed. Additionally, without built-in demodulation circuits, analog output responds slowly to rapid light pulses; thus, frequency modulation above 1–2 kHz may yield poor results unless external filtering is applied. Digital protocols like IRDA require specialized drivers beyond basic resistor biasing.
How does the absence of specified response time affect timing-critical applications such as barcode scanning or high-speed counting?
The lack of published response time data implies variability depending on load capacitance, ambient light, and drive current. In worst-case scenarios, rise/fall times could exceed 1 ms, limiting suitability for applications requiring sub-millisecond decisions. For barcode scanning at 500 scans/sec, this latency introduces ambiguity. Instead, faster photodiode-based receivers like the TCRT5000 offer microsecond-level responses. Designers should prototype with the OPB608R under expected conditions and measure actual performance rather than assume datasheet completeness.
What are the environmental trade-offs when choosing the OPB608R over solid-state sensors like photodiodes or CMOS imagers for reflective sensing?
The OPB608R offers simplicity and low cost but sacrifices spectral response accuracy and linearity. Photodiodes provide better linearity and faster response but require transimpedance amplification. CMOS imagers enable complex pattern recognition but consume far more power and occupy larger footprints. The OPB608R excels in space-constrained, low-power applications where moderate speed suffices—such as switch activation or position indication. Environmental factors like ambient IR noise necessitate shielding or modulation techniques only partially effective with transistor-based detectors.
How does the package type influence susceptibility to mechanical stress during automated assembly or field servicing?
As a through-hole component, the OPB608R resists vibration and shock better than surface-mount counterparts due to strain relief provided by lead insertion into PCB pads. However, repeated thermal cycling between -40°C and 85°C can fatigue solder joints, especially at high CTE mismatch materials. Manual rework poses risk of cracking the plastic housing. Automated pick-and-place machines handle it reliably if nozzle forces stay below recommended limits, minimizing delamination risks common in fine-pitch SMT packages.

Parts with Similar Specifications

The three parts on the right have similar specifications to TT Electronics/Optek Technology OPB608R

Product Attribute OPB608C OPB608V OPB608B OPB608A
Part Number OPB608C OPB608V OPB608B OPB608A
Manufacturer TT Electronics/Optek Technology TT Electronics/Optek Technology TT Electronics/Optek Technology TT Electronics/Optek Technology
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Current - Collector (Ic) (Max) - - - -
Sensing Distance - - - -
Voltage - Collector Emitter Breakdown (Max) - - - -
Sensing Method - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Response Time - - - -
Output Type - Current - Unbuffered Voltage - Buffered -
Current - DC Forward (If) (Max) - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Series - - - -

OPB608R Datasheet PDF

Download OPB608R pdf datasheets and TT Electronics/Optek Technology documentation for OPB608R - TT Electronics/Optek Technology.

Datasheets
OPB608A,B,C,R,V.pdf
PCN Design/Specification
Phototransistor Update 09/Mar/2015.pdf

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    Reliable FPGA with predictable behavior. Configuration and testing went smoothly, making development faster than expected.

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    Used this device in a communication signal processing board. Stable timing and no unexpected issues during implementation.

  • FPGA***lorer88
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    The FPGA works properly and all functions operate as expected. Documentation required some additional research, but overall it is a usable device for smaller signal processing projects.

  • Nath***oleman
    Jun 29, 2026

    Used this sensor component in an industrial automation setup. Detection accuracy was consistent and installation was straightforward.

  • Emil***rperTech
    Jun 23, 2026

    Works exactly as described. I used it as a USB-to-SPI bridge in a small MCU development project and communication was stable from the first setup.

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Shipment

Delivery Time

In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

Delivery Cost

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(Different time frame / countries / package size has different price.)

Delivery Method

  1. Global Common Shipment by DHL / UPS / FedEx / TNT / EMS / SF we support.
  2. Others more shipping ways, please get in touch with your customer manager.

Common Countries Logistic Time Reference
Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
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Electrostatic Discharge Protection and Handling

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OPB608R Image

OPB608R

TT Electronics/Optek Technology
32D-OPB608R

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

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