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Home > Products > Sensors, Transducers > Optical Sensors > Phototransistors

Vishay Semiconductor Opto Division VEMT4700F-GS08

Name: VEMT4700F-GS08
Brand: Vishay Semiconductor Opto Division
SKU: VEMT4700F-GS08
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: VEMT4700F-GS08

Manufacturer:: Vishay Semiconductor Opto Division

Category:: Phototransistors

Package:: 3-SMD, J-Lead

Datasheet:: VEMT4700F-GS08.pdf

Description:: SENSOR PHOT 3SMD PLCC3 DB FILTER

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Product details

Overview

VEMT4700F-GS08 from Vishay Semiconductors is a high-speed silicon NPN epitaxial planar phototransistor in a PLCC-3 surface-mount package, featuring a daylight-blocking filter matched to 950 nm IR emitters, 0.5 mA typical collector light current at 1 mW/cm² irradiance, ±60° angle of half sensitivity, and 6 μs rise/fall time with 1 kΩ load. It serves as the sensing element in compact optical interrupters and position detection systems operating from −40 °C to +100 °C.

For engineers reviewing the VEMT4700F-GS08 datasheet, VEMT4700F-GS08 pinout, VEMT4700F-GS08 application, or VEMT4700F-GS08 equivalent, this page delivers verified phototransistor specifications including spectral response (870–1050 nm), thermal resistance (400 K/W), absolute maximum ratings (70 V V_CEO, 100 mW power dissipation), and MSL 3 moisture sensitivity compliance for reliable SMT integration.

Technical Context

The VEMT4700F-GS08 operates as a single-element NPN phototransistor with base terminal connected and collector identified by package notch-enabling direct biasing or open-base operation. Its epitaxial planar structure supports fast switching (2 μs tr/tf with 100 Ω load) and low capacitance (3 pF typical C_CEO) for high-frequency optical detection up to 180 kHz cutoff frequency.

Designed for ambient temperatures from −40 °C to +100 °C, it maintains stable radiant sensitivity across temperature via low dark current (≤200 nA at 20 V, 25 °C) and predictable relative current drift (±15% over full range). The integrated daylight-blocking filter suppresses visible spectrum interference while optimizing response to 940 nm peak wavelength IR sources like VSML3710 emitters.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	70 V - Withstands up to 70 V collector-emitter voltage before breakdown, enabling use in 24 V industrial control circuits without external clamping.
I_ca (typ)	0.5 mA at 1 mW/cm², 950 nm - Delivers robust signal output under standard IR illumination, supporting reliable logic-level detection with minimal amplification.
tr/tf (RL = 1 kΩ)	6 μs - Enables 100+ kHz pulse detection in encoder or counter applications with standard pull-up resistor values.
λ_0.5	870–1050 nm - Matches common infrared emitters (e.g., 850 nm, 940 nm, 950 nm), rejecting ambient visible light for outdoor or bright-environment operation.
ϕ	±60° - Provides wide angular acceptance for misalignment-tolerant mounting in mechanical encoders and slot-type photo interrupters.
R_thJA	400 K/W - Requires minimum 4 mm × 4 mm copper pad for thermal management to sustain 100 mW power dissipation at 25 °C ambient.
V_CEsat (max)	0.3 V at I_C = 0.1 mA - Ensures low-voltage drop in saturated switching mode, compatible with 3.3 V and 5 V logic interfaces.

Pinout & Package

Package: PLCC-3 surface-mount package (3.5 × 2.8 × 1.75 mm), notch-marked to indicate collector terminal; base terminal is internally connected and accessible; emitter is common reference node.

Pin/Terminal	Circuit Role	Design Meaning
Collector (notch side)	Output current sink	Primary current path during illumination; connects to load resistor or MCU input; marked by physical notch on package edge.
Emitter	Common reference / return path	Connected to ground or low-side switch node; forms the emitter-follower or common-emitter current path with collector.
Base	Internal connection, externally accessible	Enables external biasing for gain control or speed optimization; unused in standard photoconductive mode but available for circuit tuning.

Key Features

Feature	Design Value
Daylight-blocking filter	Optimized rejection of visible light (400–700 nm) while preserving >80% quantum efficiency at 940 nm-enabling operation in unshielded indoor/outdoor environments.
MSL 3 compliance	168-hour floor life at <30 °C / <60% RH per J-STD-020-supports standard SMT reflow without baking for most production schedules.
Fast response with low C_CEO	3 pF collector-emitter capacitance enables 2 μs switching (100 Ω load), reducing propagation delay in high-resolution rotary encoders.
Matched emitter compatibility	Specified for use with VSML3710 IR emitter series-ensures optimal irradiance coupling, spectral alignment, and mechanical co-packaging in OEM sensor modules.
Lead (Pb)-free reflow profile	Rated for peak 260 °C reflow per J-STD-020-compatible with standard lead-free assembly lines without special thermal management.

Applications

Optical Encoders	Photo Interrupters
Use Scenario: Detecting slotted disk rotation in motor feedback or precision positioning systems. IC Role / Device Role / Timing Role: Phototransistor element converting IR beam interruption into digital edge transitions for quadrature decoding. Use Value: ±60° angular tolerance and 6 μs response enable ≥1000-line resolution at 10 kRPM without signal smearing or missed edges.	Use Scenario: Object presence detection in vending machines, printers, and automated doors using through-beam IR barriers. IC Role / Device Role / Timing Role: Light-sensitive switch providing clean ON/OFF output when IR beam is blocked or unblocked. Use Value: 0.5 mA I_ca ensures TTL/CMOS-compatible output swing with standard 10 kΩ pull-up, eliminating need for additional amplification.
Position Sensors	Miniature Switches
Use Scenario: Linear or angular position feedback in HVAC dampers, robotic joints, or medical device actuators. IC Role / Device Role / Timing Role: Ambient-light-immune detector paired with coded IR pattern for absolute position readout. Use Value: Daylight-blocking filter and 870–1050 nm bandwidth prevent false triggers from room lighting, ensuring >99.9% reliability in 24/7 operation.	Use Scenario: Non-contact tactile interface in consumer electronics, such as button press detection behind translucent panels. IC Role / Device Role / Timing Role: Low-profile IR receiver detecting finger-induced beam blockage in sub-3 mm gap assemblies. Use Value: 3.5 × 2.8 mm PLCC-3 footprint allows integration into space-constrained front-panel designs without compromising sensitivity.

Optical Encoders

Photo Interrupters

Use Scenario: Detecting slotted disk rotation in motor feedback or precision positioning systems.

IC Role / Device Role / Timing Role: Phototransistor element converting IR beam interruption into digital edge transitions for quadrature decoding.

Use Value: ±60° angular tolerance and 6 μs response enable ≥1000-line resolution at 10 kRPM without signal smearing or missed edges.

Use Scenario: Object presence detection in vending machines, printers, and automated doors using through-beam IR barriers.

IC Role / Device Role / Timing Role: Light-sensitive switch providing clean ON/OFF output when IR beam is blocked or unblocked.

Use Value: 0.5 mA I_ca ensures TTL/CMOS-compatible output swing with standard 10 kΩ pull-up, eliminating need for additional amplification.

Position Sensors

Miniature Switches

Use Scenario: Linear or angular position feedback in HVAC dampers, robotic joints, or medical device actuators.

IC Role / Device Role / Timing Role: Ambient-light-immune detector paired with coded IR pattern for absolute position readout.

Use Value: Daylight-blocking filter and 870–1050 nm bandwidth prevent false triggers from room lighting, ensuring >99.9% reliability in 24/7 operation.

Use Scenario: Non-contact tactile interface in consumer electronics, such as button press detection behind translucent panels.

IC Role / Device Role / Timing Role: Low-profile IR receiver detecting finger-induced beam blockage in sub-3 mm gap assemblies.

Use Value: 3.5 × 2.8 mm PLCC-3 footprint allows integration into space-constrained front-panel designs without compromising sensitivity.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TEFT4300 (Vishay)	PLCC-2 package, no base terminal, 0.35 mA I_ca, ±35° ϕ, no daylight filter	Limited ambient light immunity; narrower field-of-view requires precise alignment	Select when cost or board area is critical and optical shielding is provided externally.
QSE159 (ON Semiconductor)	TO-92 package, 0.5 mA I_ca, ±25° ϕ, no integrated filter, higher V_CEO (30 V)	Through-hole mounting only; unsuitable for high-density SMT layouts	Choose for legacy through-hole designs or where mechanical robustness outweighs size constraints.

Compared with TEFT4300 and QSE159, the VEMT4700F-GS08 provides superior ambient light rejection, wider angular coverage, and surface-mount compatibility-making it the preferred choice for modern compact, high-reliability optical sensing where PCB real estate and environmental resilience are critical.

Availability

VEMT4700F-GS08 is available at Aetrix Electronics and suitable for optical encoders, photo interrupters, and position sensors requiring stable component supply through its End of Life date in February 2026.

Supply support for VEMT4700F-GS08 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

Vishay Intertechnology is a global semiconductor manufacturer specializing in discrete components, sensors, and passive devices with emphasis on reliability, precision, and long-lifecycle support.

The VEMT4700F-GS08 belongs to Vishay's high-speed phototransistor product line, engineered specifically for compact, ambient-light-immune optical sensing in industrial automation, consumer controls, and automotive subsystems.

FAQ

What is the maximum operating temperature for the VEMT4700F-GS08?

The VEMT4700F-GS08 has an operating temperature range of −40 °C to +100 °C. Its junction temperature must not exceed 100 °C under continuous operation, and thermal design must account for R_thJA = 400 K/W-requiring at least a 4 mm × 4 mm copper pad on the PCB to maintain safe junction temperatures at full 100 mW power dissipation.

Does the VEMT4700F-GS08 require external biasing?

The VEMT4700F-GS08 includes a connected base terminal, allowing optional external biasing to adjust gain or speed-but it operates fully functional in standard photoconductive mode with only collector and emitter connections. Most applications use it in common-emitter configuration with a pull-up resistor, leveraging its 0.5 mA typical I_ca for direct logic interfacing.

Is the VEMT4700F-GS08 compatible with lead-free reflow soldering?

Yes, the VEMT4700F-GS08 is qualified for lead-free reflow soldering per J-STD-020, with a peak temperature rating of 260 °C. Its packaging and internal construction meet RoHS requirements, and the recommended reflow profile includes ramp rates ≤3 °C/s and dwell time ≤100 s above 217 °C.

What is the spectral response range of the VEMT4700F-GS08?

The VEMT4700F-GS08 has a spectral bandwidth (λ_0.5) of 870 nm to 1050 nm, with peak sensitivity at 940 nm. Its integrated daylight-blocking filter strongly attenuates wavelengths below 800 nm, making it highly selective for near-infrared emitters and resistant to interference from fluorescent, LED, or incandescent ambient light.

How does the PLCC-3 package of the VEMT4700F-GS08 differ from standard PLCC variants?

The VEMT4700F-GS08 uses a 3-pin PLCC-3 variant-not the more common 4- or 20-pin PLCC formats-with dimensions 3.5 × 2.8 × 1.75 mm and a notch identifying the collector pin. Unlike larger PLCC packages, it lacks internal leads and relies on gull-wing terminations, optimized for miniaturized optical sensor modules rather than complex IC mounting.

VEMT4700F-GS08 Specifications

Product attributes: Attribute value

Manufacturer:: Vishay Semiconductor Opto Division

Series:: -

Package/Case:: 3-SMD, J-Lead

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Collector Emitter Breakdown (Max):: -

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

Current - Dark (Id) (Max):: -

Wavelength:: -

Viewing Angle:: -

Power - Max:: -

Mounting Type:: Surface Mount

Orientation:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

VEMT4700F-GS08 FAQ

1.How can I place an order for VEMT4700F-GS08 through Aetrix?

Please submit a Request for Quotation (RFQ) for VEMT4700F-GS08 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 VEMT4700F-GS08 reliable?

The price and inventory of VEMT4700F-GS08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VEMT4700F-GS08 is usually 5 days.

3.What payment methods are accepted for VEMT4700F-GS08?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VEMT4700F-GS08 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for VEMT4700F-GS08?

VEMT4700F-GS08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your VEMT4700F-GS08 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 VEMT4700F-GS08?

For technical support, including VEMT4700F-GS08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VEMT4700F-GS08 requirements.

6.How does Aetrix verify that VEMT4700F-GS08 is sourced from the original manufacturer or authorized distributors?

All VEMT4700F-GS08 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 VEMT4700F-GS08 meets industry standards.

7.What is the process for return or replacement of VEMT4700F-GS08?

All VEMT4700F-GS08 units undergo pre-shipment inspection (PSI). If there is an issue with VEMT4700F-GS08, 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 VEMT4700F-GS08 part is unused and in its original packaging.

Return procedure for VEMT4700F-GS08:

1.Submit a request within 90 days.

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

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