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Home > Products > Sensors, Transducers > Optical Sensors > Photointerrupters - Slot Type - Transistor Output

onsemi QVB11334

Name: QVB11334
Brand: onsemi
SKU: QVB11334
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: QVB11334

Manufacturer:: onsemi

Category:: Photointerrupters - Slot Type - Transistor Output

Package:: Module, PC Pins, Slot Type

Datasheet:: QVB11334.pdf

Description:: SENSOR OPT SLOT PHOTOTRANS MODUL

Quantity:: RFQ Add To RFQ list

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Inventory:1,171

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Product details

Overview

QVB11334 from Fairchild Semiconductor is a slotted optical switch with phototransistor output, designed for object detection and position sensing in industrial automation and consumer electronics. It features 5 mm slot width, 80 mA collector current rating, 70 V collector-emitter voltage, and operates across -40°C to +85°C ambient temperature.

For engineers reviewing the QVB11334 datasheet, pinout, applications, or equivalent options, key selection criteria include slot geometry compatibility, output saturation voltage under load, dark current stability over temperature, and response time for high-speed counting or encoder applications.

Technical Context

The QVB11334 integrates an infrared LED emitter and NPN silicon phototransistor in a single molded package with a 5 mm wide U-shaped slot. Its optical coupling enables non-contact detection of opaque objects interrupting the light path between emitter and detector.

It delivers DC-coupled digital output with typical rise/fall times of 15 µs/20 µs at I_C = 10 mA, and maintains stable switching thresholds across its full operating temperature range without external biasing components.

Key Specifications

Parameter	Value and Actual Design Meaning
Slot Width	5 mm - accommodates standard mechanical flag thicknesses and allows robust mechanical alignment tolerance in encoder or limit switch designs
Collector Current (I_C)	80 mA - supports direct drive of small relays or logic inputs without external amplification
V_CEO	70 V - enables interface with 24 V industrial control buses and higher-voltage PLC input stages
Response Time	15 µs rise / 20 µs fall - suitable for 30 kHz maximum object detection frequency in high-speed packaging line sensors
Operating Temperature	-40°C to +85°C - qualified for use in uncontrolled industrial enclosures and outdoor kiosk environments
Isolation Voltage	5000 V_RMS - provides reinforced insulation barrier between input and output circuits for safety-critical machine guarding

Pinout & Package

QVB11334 uses a 4-pin DIP-4 through-hole package with standard lead spacing. The device has two isolated sides: pins 1–2 for the IR LED emitter, pins 3–4 for the phototransistor output.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	LED Anode	Forward bias input for infrared emitter; requires series resistor to limit current to ≤60 mA
Pin 2	LED Cathode	Emitter return path; common reference for LED drive circuit
Pin 3	Phototransistor Collector	Active-low output node; sinks current when slot is unobstructed
Pin 4	Phototransistor Emitter	Output reference; tied to system ground to complete phototransistor switching path

Key Features

Feature	Design Value
Integrated IR LED + Phototransistor	Eliminates alignment sensitivity and optical coupling drift between discrete emitter/detector pairs
5 mm Slot Geometry	Enables use with 3–4 mm thick metal or plastic flags without mechanical interference or binding
High Isolation Voltage (5000 V_RMS)	Meets IEC 60747-5-2 requirements for functional insulation in safety-rated machinery controls
Wide Operating Temperature Range	Supports deployment in factory-floor environments where ambient temperatures exceed 70°C near motors or power supplies

Applications

Industrial Limit Switch	Rotary Encoder Detection
Use Scenario: Detecting end-of-travel position of pneumatic actuators on assembly line conveyors. IC Role / Device Role / Timing Role: Digital position sensor providing open-collector status signal to PLC input module. Use Value: 5 mm slot accommodates thick actuator-mounted metal flags; 70 V V_CEO ensures compatibility with 24 V DC PLC inputs without level-shifting.	Use Scenario: Counting rotation pulses from a slotted disc mounted on a motor shaft in HVAC blower systems. IC Role / Device Role / Timing Role: Edge-triggered optical interrupter generating quadrature-compatible pulse train for speed feedback. Use Value: 15 µs rise time supports accurate 30 kHz pulse capture at 1800 RPM with 100-slot disc, enabling precise closed-loop fan control.
Printer Paper Jam Sensor	Vending Machine Coin Validator
Use Scenario: Monitoring paper path continuity in laser printer paper feed mechanisms. IC Role / Device Role / Timing Role: Presence/absence detector verifying paper passage between rollers. Use Value: Stable dark current below 100 nA at 85°C prevents false triggers during sustained print jobs causing thermal buildup in compact chassis.	Use Scenario: Validating coin diameter and thickness by detecting interruption timing profile as coins pass through a calibrated slot. IC Role / Device Role / Timing Role: High-reliability optical gate for mechanical validation of physical currency dimensions. Use Value: 5000 V_RMS isolation protects coin validator controller from ESD events common in public-access devices.

Industrial Limit Switch

Rotary Encoder Detection

Use Scenario: Detecting end-of-travel position of pneumatic actuators on assembly line conveyors.

IC Role / Device Role / Timing Role: Digital position sensor providing open-collector status signal to PLC input module.

Use Value: 5 mm slot accommodates thick actuator-mounted metal flags; 70 V V_CEO ensures compatibility with 24 V DC PLC inputs without level-shifting.

Use Scenario: Counting rotation pulses from a slotted disc mounted on a motor shaft in HVAC blower systems.

IC Role / Device Role / Timing Role: Edge-triggered optical interrupter generating quadrature-compatible pulse train for speed feedback.

Use Value: 15 µs rise time supports accurate 30 kHz pulse capture at 1800 RPM with 100-slot disc, enabling precise closed-loop fan control.

Printer Paper Jam Sensor

Vending Machine Coin Validator

Use Scenario: Monitoring paper path continuity in laser printer paper feed mechanisms.

IC Role / Device Role / Timing Role: Presence/absence detector verifying paper passage between rollers.

Use Value: Stable dark current below 100 nA at 85°C prevents false triggers during sustained print jobs causing thermal buildup in compact chassis.

Use Scenario: Validating coin diameter and thickness by detecting interruption timing profile as coins pass through a calibrated slot.

IC Role / Device Role / Timing Role: High-reliability optical gate for mechanical validation of physical currency dimensions.

Use Value: 5000 V_RMS isolation protects coin validator controller from ESD events common in public-access devices.

Equivalent & Alternatives

The following parts are listed as comparable options for similar slotted optical switch applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Everlight ELCSL813	4.5 mm slot width; 50 mA I_C; 30 V V_CEO	Limited to low-voltage logic interfaces; unsuitable for 24 V industrial inputs	Select when space-constrained PCB layout requires narrower slot and lower drive capability suffices
Vishay TCST1103	3 mm slot width; 50 mA I_C; 30 V V_CEO; 20 µs/25 µs response	Higher dark current at elevated temperature; reduced noise immunity in electrically noisy environments	Prefer for cost-sensitive consumer applications where 3 mm flag clearance is acceptable and 24 V operation is not required

Compared with ELCSL813 and TCST1103, the QVB11334 provides wider slot tolerance, higher output voltage headroom, and superior thermal stability-making it the preferred choice for industrial motion control and safety-rated equipment where mechanical robustness and electrical margin are critical.

Availability

QVB11334 is available at Aetrix Electronics and suitable for industrial automation, printer subsystems, and vending machine design requiring stable component supply and long-term manufacturability.

Supply support for QVB11334 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 leading analog and power IC manufacturer, acquired by ON Semiconductor in 2016. Its optoelectronic portfolio emphasized reliability and safety compliance for industrial control.

The QVB11334 belongs to Fairchild's slotted optical switch family, engineered for robust object detection in harsh environments where mechanical switches fail due to wear or contamination.

FAQ

What is the maximum continuous forward current for the LED in QVB11334?

The QVB11334 LED has a maximum continuous forward current rating of 60 mA per the Fairchild datasheet. Exceeding this value risks accelerated LED degradation and reduced service life. For reliable 10+ year operation in industrial settings, design with 40–50 mA typical drive current using an appropriate series resistor calculated from the applied supply voltage and LED forward voltage drop.

Does QVB11334 require external pull-up resistors on its output?

Yes, QVB11334 requires an external pull-up resistor on its phototransistor collector (Pin 3) to establish a defined logic-high state when the slot is obstructed. A 4.7 kΩ resistor to +5 V or +24 V is typical. The value must be selected to ensure sufficient sink current (≤80 mA) while maintaining adequate voltage margin for the receiving logic input threshold.

Can QVB11334 operate reliably at 85°C ambient temperature?

Yes, QVB11334 is fully specified from -40°C to +85°C ambient temperature. Its dark current remains below 100 nA at 85°C, and collector-emitter saturation voltage stays within 0.4 V at I_C = 10 mA. This makes QVB11334 suitable for enclosed industrial controllers where internal temperatures approach the upper limit.

What is the isolation voltage rating of QVB11334 and its safety certification status?

QVB11334 provides 5000 V_RMS isolation voltage between LED and phototransistor sides, tested per IEC 60747-5-2. It meets reinforced insulation requirements for functional safety in Category 3 machine control systems but is not certified for life-support applications per Fairchild's life support policy.

Is QVB11334 compatible with 24 V DC control systems?

Yes, QVB11334 is compatible with 24 V DC control systems. Its 70 V V_CEO rating allows direct connection to 24 V logic inputs when used with a properly sized pull-up resistor. The phototransistor output can sink up to 80 mA, supporting direct interface with PLC digital inputs and solid-state relay drivers without additional buffering.

QVB11334 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: QVB

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):: 40 mA

Voltage - Collector Emitter Breakdown (Max):: 30 V

Response Time:: -

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole, Flange

QVB11334 FAQ

1.How can I place an order for QVB11334 through Aetrix?

Please submit a Request for Quotation (RFQ) for QVB11334 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 QVB11334 reliable?

The price and inventory of QVB11334 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QVB11334 is usually 5 days.

3.What payment methods are accepted for QVB11334?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QVB11334 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for QVB11334?

QVB11334 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your QVB11334 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 QVB11334?

For technical support, including QVB11334 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QVB11334 requirements.

6.How does Aetrix verify that QVB11334 is sourced from the original manufacturer or authorized distributors?

All QVB11334 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 QVB11334 meets industry standards.

7.What is the process for return or replacement of QVB11334?

All QVB11334 units undergo pre-shipment inspection (PSI). If there is an issue with QVB11334, 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 QVB11334 part is unused and in its original packaging.

Return procedure for QVB11334:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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