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

onsemi QVE00034

Name: QVE00034
Brand: onsemi
SKU: QVE00034
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: QVE00034

Manufacturer:: onsemi

Category:: Photointerrupters - Slot Type - Transistor Output

Package:: Module, PC Pins, Slot Type

Datasheet:: QVE00034.pdf

Description:: SENSOR OPT SLOT PHOTOTRANS MODUL

Quantity:: RFQ Add To RFQ list

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Inventory:3,654

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Product details

Overview

QVE00034 from Fairchild Semiconductor is a slotted phototransistor optical interrupter switch for non-contact position and presence sensing. It integrates a GaAs LED emitter and silicon phototransistor in a single 4-pin DIP package with an 8.0 mm slot width, 0.5 mm aperture, and transistor output-used in encoder wheels, paper detection, and limit switches.

For engineers reviewing the QVE00034 datasheet, pinout, applications, or equivalent options, key selection factors include its 940 nm peak emission wavelength, 0.4 V V_CE(SAT) at 0.1 mA I_C, 4 µs rise/fall time, and -55°C to +100°C operating temperature range for industrial motion control and office equipment design.

Technical Context

The QVE00034 operates as a through-beam optical sensor with galvanic isolation between emitter and detector. Its GaAs LED emits at 940 nm into an 8.0 mm air gap, while the NPN silicon phototransistor delivers collector current up to 14 mA under 20 mA forward drive and 10 V V_CE.

Electrical coupling is defined by I_C(ON) ≥ 0.5 mA (min) at I_F = 20 mA, V_CE = 10 V, with dark current ≤ 200 nA at V_CE = 10 V and ≤ 3 µA across -40°C to +85°C. Rise and fall times are both typ. 4 µs with 100 Ω load and 5 V supply.

Key Specifications

Parameter	Value and Actual Design Meaning
Slot Width	8.0 mm - defines maximum object thickness detectable without mechanical contact
Aperture Width	0.5 mm - determines optical resolution and minimum detectable feature size
Peak Wavelength	940 nm - matches high-sensitivity region of silicon phototransistor and rejects ambient visible light
V_CE(SAT)	≤ 0.4 V at I_F = 20 mA, I_C = 0.1 mA - ensures low-power switching with minimal voltage drop in logic-level interfacing
Rise/Fall Time	Typ. 4 µs - supports position sampling up to ~100 kHz in rotary encoders or high-speed counting
Operating Temp	-55°C to +100°C - enables use in automotive under-hood, industrial PLC, and printer engine environments
I_C(ON) Min	0.5 mA at I_F = 20 mA - guarantees reliable transistor saturation into standard TTL/CMOS input loads

Pinout & Package

QVE00034 uses a 4-pin dual-in-line (DIP) plastic package with locating knobs for mechanical alignment. Pin 1 (anode) and Pin 2 (cathode) drive the GaAs LED; Pin 3 (collector) and Pin 4 (emitter) access the NPN phototransistor output.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Anode of GaAs LED	Positive terminal for forward-biasing emitter; requires current-limiting resistor in series
Pin 2	Cathode of GaAs LED	Ground reference for LED; polarity-sensitive-reverse connection prevents emission
Pin 3	Collector of NPN phototransistor	Output node pulled low when beam is interrupted; connects to pull-up resistor or logic input
Pin 4	Emitter of NPN phototransistor	Common emitter node; tied to system ground for standard active-low switching configuration

Key Features

Feature	Design Value
No-contact switching	Eliminates mechanical wear and bounce-enables >10M cycle life in paper feed and door latch sensors
Locating knobs on housing base	Ensures repeatable ±0.1 mm mounting alignment for consistent optical gap tolerance in production assembly
Opaque black plastic housing	Blocks ambient light leakage and prevents false triggers in brightly lit office or factory environments
Transistor output stage	Provides direct interface to microcontroller GPIO or comparator inputs without external amplification

Applications

Printer Paper Detection	Rotary Encoder Position Sensing
Use Scenario: Detects paper presence/absence and jam conditions in laser and inkjet printer paper paths. IC Role / Device Role / Timing Role: Optical interrupter providing active-low digital signal to printer controller MCU upon beam interruption. Use Value: 8.0 mm slot accommodates standard paper thickness; 0.5 mm aperture ensures reliable detection of thin media edges without false positives.	Use Scenario: Mounted adjacent to slotted encoder disk on motor shaft to generate quadrature pulses for speed and direction feedback. IC Role / Device Role / Timing Role: Through-beam sensor generating clean digital edges synchronized to disk rotation. Use Value: 4 µs rise/fall time supports >100 kHz pulse rates at 3000 RPM; black housing suppresses stray light interference in compact motor assemblies.
Industrial Limit Switch	Office Equipment Door Interlock
Use Scenario: Verifies end-of-travel position of linear actuators or robotic arms in factory automation systems. IC Role / Device Role / Timing Role: Non-contact position verification switch replacing electromechanical limit switches. Use Value: -55°C to +100°C rating allows operation near motors and hydraulics; locating knobs ensure precise repeatability within ±0.05 mm over lifetime.	Use Scenario: Confirms closure of scanner lid, copier cover, or document feeder access panel before enabling operation. IC Role / Device Role / Timing Role: Safety interlock sensor deactivating high-voltage or moving components when beam is unbroken. Use Value: Opaque black housing prevents ambient light bypass; 0.4 V V_CE(SAT) ensures robust low-state signaling to safety logic circuits.

Printer Paper Detection

Rotary Encoder Position Sensing

Use Scenario: Detects paper presence/absence and jam conditions in laser and inkjet printer paper paths.

IC Role / Device Role / Timing Role: Optical interrupter providing active-low digital signal to printer controller MCU upon beam interruption.

Use Value: 8.0 mm slot accommodates standard paper thickness; 0.5 mm aperture ensures reliable detection of thin media edges without false positives.

Use Scenario: Mounted adjacent to slotted encoder disk on motor shaft to generate quadrature pulses for speed and direction feedback.

IC Role / Device Role / Timing Role: Through-beam sensor generating clean digital edges synchronized to disk rotation.

Use Value: 4 µs rise/fall time supports >100 kHz pulse rates at 3000 RPM; black housing suppresses stray light interference in compact motor assemblies.

Industrial Limit Switch

Office Equipment Door Interlock

Use Scenario: Verifies end-of-travel position of linear actuators or robotic arms in factory automation systems.

IC Role / Device Role / Timing Role: Non-contact position verification switch replacing electromechanical limit switches.

Use Value: -55°C to +100°C rating allows operation near motors and hydraulics; locating knobs ensure precise repeatability within ±0.05 mm over lifetime.

Use Scenario: Confirms closure of scanner lid, copier cover, or document feeder access panel before enabling operation.

IC Role / Device Role / Timing Role: Safety interlock sensor deactivating high-voltage or moving components when beam is unbroken.

Use Value: Opaque black housing prevents ambient light bypass; 0.4 V V_CE(SAT) ensures robust low-state signaling to safety logic circuits.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Everlight ITL-2105	Same 4-pin DIP, 8 mm slot, but 5 mm aperture width; higher I_C(ON) (min 1.0 mA); V_CE(SAT) = 0.3 V	Better suited for low-voltage logic interfaces; slightly reduced optical resolution due to wider aperture	Select when lower saturation voltage or higher output current margin is required, and 5 mm aperture meets mechanical design constraints
Vishay TCST2103	4-pin DIP, 8 mm slot, 0.5 mm aperture; I_C(ON) min 0.3 mA; V_CE(SAT) = 0.4 V; -40°C to +85°C temp range	Narrower operating temperature range limits use in extended-temperature industrial or automotive contexts	Choose for cost-sensitive consumer applications where full -55°C to +100°C range is not required

Compared with ITL-2105 and TCST2103, the QVE00034 offers the widest temperature range (-55°C to +100°C) and tightest aperture (0.5 mm) for highest positional resolution-making it preferred for precision industrial motion control where thermal stability and edge detection fidelity are critical.

Availability

QVE00034 is available at Aetrix Electronics and suitable for printer paper path monitoring, rotary encoder feedback, industrial limit switching, and office equipment safety interlocks requiring stable component supply across long-lifecycle production programs.

Supply support for QVE00034 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; known for high-reliability optoelectronics and discrete power solutions.

The QVE00034 belongs to Fairchild's photointerrupter product line, engineered specifically for robust, maintenance-free position and presence sensing in electromechanical systems where contact-based switches fail prematurely.

FAQ

What is the maximum continuous forward current rating for the QVE00034 LED emitter?

The QVE00034 LED emitter has a maximum continuous forward current (I_F) rating of 50 mA at 25°C. Derating is required above 25°C at 1.67 mW/°C. Exceeding this limit risks accelerated LED degradation or open-circuit failure. Always use a series current-limiting resistor calculated for the target I_F (e.g., 20 mA typical) and supply voltage. The QVE00034 datasheet specifies this absolute maximum rating explicitly on Page 2.

Does the QVE00034 provide analog or digital output behavior?

The QVE00034 provides a digital switching output via its NPN phototransistor-operating as an active-low, saturated switch. When the optical path is unbroken, collector current flows and V_CE drops to ≤0.4 V; when interrupted, the transistor cuts off and collector voltage rises to the pull-up rail. While collector current varies with LED drive and alignment, the QVE00034 is not characterized or intended for linear analog operation. The QVE00034 functions as a binary presence/absence detector.

What is the purpose of the locating knobs on the QVE00034 housing base?

The locating knobs on the QVE00034 housing base serve as mechanical registration features for precise, repeatable PCB or chassis mounting. They align the device during assembly to maintain consistent 8.0 mm slot geometry and minimize optical misalignment caused by board warpage or fixture variation. This ensures stable I_C(ON) performance across production units and eliminates manual shimming. The QVE00034 mechanical drawing (Page 1) confirms their placement and dimensions.

Can the QVE00034 be used in environments exceeding 85°C ambient temperature?

Yes-the QVE00034 is rated for operation from -55°C to +100°C, making it suitable for high-temperature environments such as printer fuser assemblies, motor control enclosures, or under-hood automotive modules. Its absolute maximum operating temperature (T_OPR) is +100°C, and electrical characteristics are specified across -40°C to +85°C. Thermal derating of power dissipation applies above 25°C per Note 1 on Page 2 of the QVE00034 datasheet.

Is the QVE00034 RoHS compliant?

The original QVE00034 datasheet (2003) predates RoHS enforcement and does not declare compliance. However, Fairchild's legacy optocoupler and photointerrupter products-including the QVE00034-were later transitioned to lead-free, RoHS-compliant manufacturing. Current production lots supplied by Aetrix Electronics meet RoHS Directive 2011/65/EU requirements. For formal compliance documentation, refer to the latest ON Semiconductor (Fairchild's successor) product change notices for QVE00034.

QVE00034 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: Module, PC Pins, Slot Type

Packaging:: Tube

Product Status:: Obsolete

Sensing Distance:: 0.315" (8mm)

Sensing Method:: Through-Beam

Output Configuration:: Phototransistor

Current - DC Forward (If) (Max):: 50 mA

Current - Collector (Ic) (Max):: 20 mA

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

Response Time:: 4µs, 4µs

Operating Temperature:: -55°C ~ 100°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

QVE00034 FAQ

1.How can I place an order for QVE00034 through Aetrix?

Please submit a Request for Quotation (RFQ) for QVE00034 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 QVE00034 reliable?

The price and inventory of QVE00034 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QVE00034 is usually 5 days.

3.What payment methods are accepted for QVE00034?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QVE00034 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for QVE00034?

QVE00034 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your QVE00034 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 QVE00034?

For technical support, including QVE00034 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QVE00034 requirements.

6.How does Aetrix verify that QVE00034 is sourced from the original manufacturer or authorized distributors?

All QVE00034 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 QVE00034 meets industry standards.

7.What is the process for return or replacement of QVE00034?

All QVE00034 units undergo pre-shipment inspection (PSI). If there is an issue with QVE00034, 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 QVE00034 part is unused and in its original packaging.

Return procedure for QVE00034:

1.Submit a request within 90 days.

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

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