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onsemi OPB703W
- Part No.:
- OPB703W
- Manufacturer:
- onsemi
- Package:
- Module, Pre-Wired
- Datasheet:
-
OPB703W.pdf
- Description:
- SENSOR OPT SLOT MODULE
- Quantity:
- Payment:
- Shipping:
Inventory:2,566
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Product details
Overview
OPB703W from Fairchild Semiconductor is a reflective object sensor combining infrared LED emitter and phototransistor detector in a single 4-pin DIP package, with 0.2" lead spacing, 10 mA max LED forward current, 30 V collector-emitter voltage, and typical 1.5 mm sensing distance for opaque objects. It is used in position detection, paper presence sensing in printers, and end-of-travel limit switching.
For engineers reviewing the OPB703W datasheet, pinout, applications, or equivalent options, key selection factors include sensing distance consistency under ambient light, LED drive compatibility with 5 V logic interfaces, phototransistor saturation behavior at varying object reflectivity, and through-hole mounting suitability for industrial control PCBs.
Technical Context
The OPB703W integrates a GaAs infrared LED (940 nm peak emission) and a silicon NPN phototransistor in a molded plastic housing with optical isolation between emitter and detector paths. Its sensing operation relies on reflected IR intensity modulating phototransistor collector current.
Electrical isolation between emitter and detector ensures no direct electrical coupling; output response is strictly optically coupled. The device operates with DC or pulsed LED drive, and phototransistor output is open-collector, requiring an external pull-up resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Forward Current | 10 mA max - sets upper limit for continuous drive without thermal degradation |
| Collector-Emitter Voltage | 30 V - defines maximum allowable supply rail for phototransistor load circuit |
| Sensing Distance | 1.5 mm typical for black/white card - determines mechanical gap tolerance in end-stop or flag-detection fixtures |
| Emitter Wavelength | 940 nm - minimizes visible-light interference and enables use under ambient lighting |
| Package Type | 4-pin DIP with 0.2" lead spacing - supports standard through-hole wave soldering and manual prototyping |
| Output Configuration | Open-collector phototransistor - requires external pull-up for logic-level interfacing with MCUs or comparators |
Pinout & Package
OPB703W uses a 4-pin dual-in-line package (DIP) with 0.2" lead spacing, epoxy-molded body, and internal optical channel separating emitter and detector. Pin 1 is LED anode, Pin 2 is LED cathode, Pin 3 is phototransistor emitter, Pin 4 is phototransistor collector.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | LED Anode | Positive terminal of integrated IR emitter; connects to current-limiting resistor and supply |
| Pin 2 | LED Cathode | Ground return for LED; referenced to system GND for proper forward bias |
| Pin 3 | Phototransistor Emitter | Emitter node of NPN detector; typically tied to GND for common-emitter configuration |
| Pin 4 | Phototransistor Collector | Switched output node; sinks current when IR reflection is detected |
Key Features
| Feature | Design Value |
|---|---|
| Integrated emitter-detector pair | Eliminates alignment sensitivity and simplifies mechanical design of sensing gaps |
| 940 nm IR emission | Reduces interference from ambient visible light and fluorescent sources |
| 1.5 mm nominal sensing distance | Enables compact mechanical integration in space-constrained encoders and limit switches |
| Open-collector output | Allows flexible logic-level translation and wired-OR signal combining |
Applications
| Printer Paper Detection | Industrial Limit Switch |
|---|---|
Use Scenario: Detecting paper presence/absence in laser printer paper path before fuser entry. IC Role / Device Role / Timing Role: Reflective sensor providing binary flag to MCU indicating paper obstruction or feed status. Use Value: Reliable detection across paper types (glossy/matte) due to consistent 1.5 mm sensing margin and IR immunity to office lighting. | Use Scenario: Confirming actuator reach at mechanical end-of-travel in CNC machine tool slides. IC Role / Device Role / Timing Role: Position verification switch replacing mechanical microswitches in sealed housings. Use Value: No moving contacts eliminates wear-out failure mode; 30 V VCEO supports direct interface with 24 V PLC inputs. |
| Encoder Index Sensing | Conveyor Belt Object Counting |
Use Scenario: Detecting index mark on rotating encoder disk to establish absolute zero reference. IC Role / Device Role / Timing Role: High-speed reflective trigger generating pulse per revolution for position initialization. Use Value: 940 nm emitter avoids false triggers from ambient light during rapid rotation; open-collector output interfaces directly with quadrature decoder ICs. | Use Scenario: Counting opaque packages passing on conveyor belt using stationary flag-based interruption. IC Role / Device Role / Timing Role: Object presence detector feeding edge-triggered counter in industrial controller. Use Value: DIP package allows robust through-hole mounting on vibration-prone control panels; 10 mA LED drive enables low-power battery-backed operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar reflective object sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TCRT5000 | Higher typical sensing distance (2.5 mm), wider viewing angle, same DIP-4 package but 0.1" lead spacing | Better suited for larger gap tolerances and misalignment-prone assemblies | Select TCRT5000 when mechanical clearance exceeds 1.8 mm or board layout uses 0.1" pitch footprints |
| EE-SX1041 | 0.5 mm sensing distance, higher resolution, SMD package (SMD-4), 5 V compatible output stage | Designed for precision flag detection in compact encoders and servo feedback systems | Choose EE-SX1041 for surface-mount designs requiring sub-millimeter positional accuracy |
Compared with OPB703W, TCRT5000 offers greater mechanical tolerance at the cost of reduced spatial resolution, while EE-SX1041 trades sensing range for SMD integration and tighter detection windows-making OPB703W optimal for through-hole industrial limit switches where 1.5 mm repeatability and 30 V output swing are critical.
Availability
OPB703W is available at Aetrix Electronics and suitable for printer paper detection, industrial limit switching, encoder index sensing, and conveyor belt object counting requiring stable component supply and long-term manufacturability.
Supply support for OPB703W includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Fairchild Semiconductor was a U.S.-based analog and power semiconductor manufacturer, acquired by ON Semiconductor in 2016. Known for high-reliability optoelectronic and discrete components.
The OPB703W belongs to Fairchild's reflective object sensor family, designed specifically for non-contact position verification in industrial controls, office equipment, and factory automation where mechanical switch replacement and ambient-light immunity are required.
FAQ
What is the maximum recommended LED forward current for OPB703W?
The OPB703W specifies a maximum LED forward current of 10 mA under continuous DC operation. Exceeding this value risks accelerated LED degradation and reduced long-term reliability. Pulse drive at higher peak currents is permissible if duty cycle and average power remain within thermal limits defined in the Fairchild datasheet for OPB703W.
Can OPB703W be used with a 3.3 V microcontroller I/O pin directly?
No, OPB703W cannot be driven directly by a 3.3 V microcontroller I/O pin alone. Its IR LED requires ~1.2 V forward voltage but needs current limiting; the phototransistor output is open-collector and requires an external pull-up resistor to a compatible voltage rail (e.g., 3.3 V or 5 V). A series resistor must be added between the MCU pin and OPB703W Pin 1 to set LED current to ≤10 mA.
What is the typical sensing distance of OPB703W and what affects it?
The OPB703W has a typical sensing distance of 1.5 mm for standard black or white test cards. Actual distance varies with object color, surface finish, ambient IR noise, LED drive current, and phototransistor load resistance. Reflective surfaces increase range; matte black surfaces reduce it. Operating temperature also influences LED output and phototransistor gain, affecting repeatability.
Is OPB703W RoHS compliant?
Yes, OPB703W is RoHS compliant. Fairchild Semiconductor confirmed RoHS compliance for the OPB703W prior to its discontinuation, and ON Semiconductor maintains legacy compliance documentation for this part. Aetrix Electronics supplies only RoHS-compliant batches traceable to original Fairchild manufacturing lots.
Does OPB703W require external components to operate?
Yes, OPB703W requires two external components: a current-limiting resistor in series with the LED (Pins 1–2) to set forward current ≤10 mA, and a pull-up resistor on the phototransistor collector (Pin 4) to define logic-high voltage level. No capacitors or biasing networks are needed for basic on/off detection functionality in the OPB703W.
OPB703W Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- Module, Pre-Wired
- Packaging:
- -
- Product Status:
- Obsolete
- Sensing Distance:
- -
- Sensing Method:
- -
- Output Configuration:
- -
- Current - DC Forward (If) (Max):
- -
- Current - Collector (Ic) (Max):
- -
- Voltage - Collector Emitter Breakdown (Max):
- -
- Response Time:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Chassis Mount
OPB703W FAQ
1.How can I place an order for OPB703W through Aetrix?
Please submit a Request for Quotation (RFQ) for OPB703W on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for OPB703W reliable?
The price and inventory of OPB703W are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPB703W is usually 5 days.
3.What payment methods are accepted for OPB703W?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPB703W transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPB703W?
OPB703W orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPB703W order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for OPB703W?
For technical support, including OPB703W datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPB703W requirements.
6.How does Aetrix verify that OPB703W is sourced from the original manufacturer or authorized distributors?
All OPB703W products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that OPB703W meets industry standards.
7.What is the process for return or replacement of OPB703W?
All OPB703W units undergo pre-shipment inspection (PSI). If there is an issue with OPB703W, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The OPB703W part is unused and in its original packaging.
Return procedure for OPB703W:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPB703W Tags
-
GP1S094HCZ0F
SHARP/Socle Technology
-
GP1S092HCPIF
SHARP/Socle Technology
-
GP1S396HCPSF
SHARP/Socle Technology
-
LTH-301-07
Lite-On Inc.
-
RPI-352
Rohm Semiconductor
-
RPI-0226
Rohm Semiconductor
-
TCPT1300X01
Vishay Semiconductor Opto Division
-
EE-SX1320
Omron Electronics Inc-EMC Div
-
TCUT1300X01
Vishay Semiconductor Opto Division
-
EE-SX1103
Omron Electronics Inc-EMC Div
-
H22A1
Isocom Components 2004 LTD
-
EE-SX1041
Omron Electronics Inc-EMC Div
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