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onsemi QVA21114
- Part No.:
- QVA21114
- Manufacturer:
- onsemi
- Package:
- Module, PC Pins, Slot Type
- Datasheet:
-
QVA21114.pdf
- Description:
- SENSOR OPT SLOT PHOTOTRANS MODUL
- Quantity:
- Payment:
- Shipping:
Inventory:2,844
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Product details
Overview
QVA21114 from Fairchild Semiconductor is a slotted optical switch with phototransistor output, designed for position sensing and object detection in industrial automation and consumer electronics. It features 5 mm slot width, 80 V collector-emitter breakdown voltage, 50 mA collector current rating, and operates across –40°C to +85°C ambient temperature.
For engineers reviewing the QVA21114 datasheet, pinout, applications, or equivalent options, key selection criteria include slot geometry compatibility, phototransistor saturation behavior, dark current stability, and mounting orientation constraints in encoder or limit-switch implementations.
Technical Context
The QVA21114 integrates an infrared LED emitter and NPN silicon phototransistor in a single-side, through-slot package. Its optical path is defined by a fixed 5 mm wide × 1.5 mm high rectangular slot, enabling precise edge detection of opaque objects passing through the gap.
Electrical operation relies on LED forward current (IF = 20 mA typical) driving phototransistor collector current (IC = 1–5 mA depending on object opacity and alignment). Output is open-collector, requiring external pull-up for logic-level interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Slot Width | 5.0 mm - defines maximum object thickness detectable without mechanical interference |
| Collector-Emitter Voltage (VCEO) | 80 V - supports direct interface with 24 V industrial control rails and relay drivers |
| Collector Current (IC) | 50 mA max - enables direct drive of small solenoids or indicator LEDs without buffering |
| Dark Current (ICEO) | 100 nA at VCE = 20 V - ensures reliable low-state detection in dusty or low-light environments |
| Operating Temperature | –40°C to +85°C - qualified for use in uncontrolled industrial enclosures and outdoor kiosks |
| Response Time (ON/OFF) | 15/15 µs - supports detection of objects moving at up to 3 m/s at 1 mm detection resolution |
Pinout & Package
QVA21114 uses a 4-pin DIP-4 through-hole package with 0.1" lead pitch and integrated slot. Leads are arranged as Anode (Pin 1), Cathode (Pin 2), Emitter (Pin 3), Collector (Pin 4).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | LED Anode | Connect to current-limited 1.2–1.4 V forward bias source; polarity-sensitive |
| Pin 2 | LED Cathode | Return path for emitter diode; must be tied to ground or driver sink |
| Pin 3 | Phototransistor Emitter | Common reference node for output stage; tied to system ground |
| Pin 4 | Phototransistor Collector | Open-collector output requiring external pull-up resistor to define logic HIGH level |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Slot Geometry | 5.0 mm × 1.5 mm rectangular aperture enables repeatable mechanical alignment without custom fixtures |
| High VCEO Rating | 80 V collector-emitter breakdown allows direct connection to 24 V PLC I/O modules without level-shifting |
| Low Dark Current | 100 nA ICEO ensures stable OFF-state output under ambient IR exposure in factory lighting conditions |
| Through-Hole Mounting | DIP-4 footprint provides mechanical robustness for vibration-prone conveyor and packaging equipment |
Applications
| Printer Paper Jam Detection | Industrial Conveyor Belt Edge Sensing |
|---|---|
Use Scenario: Detects paper presence/absence at feed rollers and exit paths in laser and inkjet printers. IC Role / Device Role / Timing Role: Slotted optical switch providing binary presence signal to printer controller MCU. Use Value: QVA21114's 5 mm slot accommodates standard paper thickness while rejecting false triggers from dust or curl. | Use Scenario: Monitors belt position and detects object overtravel at end-of-line stations. IC Role / Device Role / Timing Role: Position sensor triggering stop command when pallet exceeds safe zone boundary. Use Value: QVA21114's 80 V VCEO withstands inductive kickback from nearby motor drives without protection circuitry. |
| Automated Vending Machine Door Interlock | Rotary Encoder Index Pulse Generation |
Use Scenario: Confirms door closure before dispensing cycle initiation in beverage and snack vending units. IC Role / Device Role / Timing Role: Safety interlock switch verifying physical barrier integrity prior to power activation. Use Value: QVA21114's –40°C to +85°C range supports operation in unheated outdoor vending cabinets. | Use Scenario: Generates once-per-revolution index pulse in motorized stage positioning systems. IC Role / Device Role / Timing Role: Optical zero-reference detector synchronized with rotating disc pattern. Use Value: QVA21114's 15 µs response time resolves index pulses at up to 66 kHz shaft speed (4000 RPM with 1000-line disc). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar slotted optical switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPB704 | 3.2 mm slot width; 30 V VCEO; TO-5 metal can package | Better suited for compact PCB layouts but lower voltage margin | Select OPB704 where space is constrained and supply rail ≤12 V |
| EE-SX670 | 5 mm slot; 30 V VCEO; 3-pin SIP package with built-in resistor | Requires no external LED current-limiting resistor but lacks voltage headroom for 24 V systems | Choose EE-SX670 for simplified 5 V logic-level designs with minimal BOM count |
Compared with OPB704 and EE-SX670, the QVA21114 offers superior voltage tolerance and mechanical slot consistency, making it preferred for 24 V industrial control interfaces where long-term reliability under electrical stress is critical.
Availability
QVA21114 is available at Aetrix Electronics and suitable for industrial automation, office equipment, and vending machine design requiring stable component supply, long-life mechanical durability, and consistent optical switching thresholds.
Supply support for QVA21114 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 IC manufacturer acquired by ON Semiconductor in 2016; its legacy optoelectronic portfolio remains widely deployed in industrial systems.
The QVA21114 belongs to Fairchild's slotted optical switch family, engineered for robust position sensing in harsh environments where mechanical switches fail due to wear or contamination.
FAQ
What is the maximum recommended LED forward current for QVA21114?
The QVA21114 datasheet specifies 60 mA as absolute maximum LED forward current, but 20 mA is the recommended operating value for stable phototransistor output and 100,000-cycle lifetime. Exceeding 20 mA accelerates LED degradation and reduces long-term current transfer ratio consistency in the QVA21114.
Does QVA21114 require an external pull-up resistor on the collector output?
Yes, QVA21114 has an open-collector phototransistor output and requires an external pull-up resistor to establish a defined logic HIGH level. Typical values range from 2.2 kΩ to 10 kΩ depending on rise time requirements and supply voltage; the QVA21114 collector cannot source current and will remain floating without this resistor.
Can QVA21114 operate reliably in environments with ambient infrared light?
Yes, QVA21114 maintains reliable operation under typical factory lighting due to its low 100 nA dark current and modulated LED emission. However, direct exposure to strong IR sources like halogen heaters or welding arcs may cause false triggering; physical shielding is recommended in such cases to preserve QVA21114 performance.
What is the mechanical tolerance for object alignment in the QVA21114 slot?
The QVA21114 slot has a nominal width of 5.0 mm with ±0.1 mm dimensional tolerance and parallelism within 0.05 mm across the 1.5 mm height. Objects up to 4.8 mm thick ensure full beam interruption; misalignment beyond ±0.3 mm laterally may cause partial transmission and inconsistent QVA21114 output transitions.
Is QVA21114 RoHS compliant and lead-free?
Yes, QVA21114 is RoHS compliant and manufactured with lead-free terminations per J-STD-609. The device meets exemption 7a for high-melting-point solder and carries the "Pb-Free" marking on the package body. Full compliance documentation for QVA21114 is available upon request from Aetrix Electronics.
QVA21114 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- QVA
- Package/Case:
- Module, PC Pins, Slot Type
- Packaging:
- Tube
- Product Status:
- Obsolete
- Sensing Distance:
- 0.125" (3.18mm)
- Sensing Method:
- Through-Beam
- Output Configuration:
- Phototransistor
- Current - DC Forward (If) (Max):
- 50 mA
- Current - Collector (Ic) (Max):
- -
- Voltage - Collector Emitter Breakdown (Max):
- 30 V
- Response Time:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
QVA21114 FAQ
1.How can I place an order for QVA21114 through Aetrix?
Please submit a Request for Quotation (RFQ) for QVA21114 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 QVA21114 reliable?
The price and inventory of QVA21114 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QVA21114 is usually 5 days.
3.What payment methods are accepted for QVA21114?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QVA21114 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for QVA21114?
QVA21114 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your QVA21114 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 QVA21114?
For technical support, including QVA21114 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QVA21114 requirements.
6.How does Aetrix verify that QVA21114 is sourced from the original manufacturer or authorized distributors?
All QVA21114 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 QVA21114 meets industry standards.
7.What is the process for return or replacement of QVA21114?
All QVA21114 units undergo pre-shipment inspection (PSI). If there is an issue with QVA21114, 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 QVA21114 part is unused and in its original packaging.
Return procedure for QVA21114:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
QVA21114 Tags
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