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

Vishay Semiconductor Opto Division VEMT3705X02-GS18

Name: VEMT3705X02-GS18
Brand: Vishay Semiconductor Opto Division
SKU: VEMT3705X02-GS18
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: VEMT3705X02-GS18

Manufacturer:: Vishay Semiconductor Opto Division

Category:: Phototransistors

Package:: 2-SMD, J-Lead

Datasheet:: VEMT3705X02-GS18.pdf

Description:: PHOTO TRANS. SMD PLCC2 AECQ-101

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Product details

Overview

VEMT3705X02-GS18 from Vishay Semiconductors is a high-speed silicon NPN epitaxial planar phototransistor in a PLCC-2 surface-mount package, rated for 20 V V_CEO, 0.6 mA typical collector light current (I_ca) at 940 nm, ±60° half-sensitivity angle, and AEC-Q102 qualification-used in optical encoders and position sensors requiring fast response and visible/NIR sensitivity.

For engineers reviewing the VEMT3705X02-GS18 datasheet, VEMT3705X02-GS18 pinout, VEMT3705X02-GS18 application, or VEMT3705X02-GS18 equivalent, key selection criteria include spectral bandwidth (480–1050 nm), rise/fall times (14/21 μs), thermal resistance (400 K/W), and MSL 3 moisture sensitivity compliance for automotive-grade reflow assembly.

Technical Context

The VEMT3705X02-GS18 operates as a light-controlled NPN transistor with emitter-grounded configuration, optimized for pulsed IR detection at 940 nm. Its planar epitaxial structure enables fast carrier transit, yielding 14 μs rise and 21 μs fall times under 100 Ω load and 5 V V_CE.

It features a defined angular response (±60° half-sensitivity), peak spectral sensitivity at 950 nm, and low dark current (0.2 nA typ.)-enabling reliable signal discrimination in ambient-light-variable environments such as industrial encoders and photo-interrupter switches.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	20 V - Maximum safe collector-emitter voltage before breakdown; sets upper limit for biasing in optocoupler or interrupter circuits.
I_ca (typ.)	0.6 mA at 1 mW/cm², 940 nm - Defines usable output current level for logic-level interfacing without external amplification.
Rise/Fall time	14 / 21 μs - Enables >10 kHz optical pulse detection; suitable for rotary encoder slots up to 10k lines/rev at moderate speeds.
λ_0.1	480–1050 nm - Supports both visible (e.g., 650 nm LED) and NIR (e.g., 850/940 nm) emitters, enabling flexible source pairing.
Angle of half sensitivity	±60° - Provides wide field-of-view alignment tolerance in mechanical assemblies, reducing precision mounting requirements.
R_thJA	400 K/W - Limits max continuous power dissipation to 100 mW at T_amb = 25°C; requires thermal pad design for >50 mW average operation.
AEC-Q102	Qualified - Confirms reliability for automotive cabin and body electronics applications including seat position sensing and HVAC controls.

Pinout & Package

Package: PLCC-2 surface-mount package (3.5 × 2.8 × 1.75 mm), notch-marked for collector identification, optimized for automated placement and IR emitter matching (e.g., VSML3710).

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Collector	Output terminal; marked by package notch; connects to pull-up resistor or load; carries photogenerated current.
Pin 2	Emitter	Ground reference terminal; tied to PCB ground plane; completes phototransistor conduction path.

Key Features

Feature	Design Value
Fast switching speed	14 μs rise / 21 μs fall enables real-time detection of high-frequency optical pulses in motion control systems.
Wide spectral response	480–1050 nm range allows compatibility with standard visible LEDs and NIR emitters without filter redesign.
Angular tolerance	±60° half-sensitivity angle reduces mechanical alignment sensitivity in compact sensor housings and moving-part interfaces.
AEC-Q102 qualification	Validated for automotive temperature (-40 to +100°C) and reliability requirements, supporting under-hood and interior sensing.
MSL 3 moisture rating	168-hour floor life per J-STD-020 enables standard SMT reflow without baking-reducing production overhead.

Applications

Photo Interrupters	Rotary Encoders
Use Scenario: Object presence detection in vending machines, printers, and paper-path monitoring where beam interruption triggers event logic. IC Role / Device Role / Timing Role: Light-sensitive switch providing digital on/off output via collector current modulation. Use Value: ±60° angular tolerance accommodates minor misalignment during assembly; 0.6 mA I_ca drives standard logic inputs directly.	Use Scenario: Angular position feedback in motor control systems using slotted disk and emitter-detector pair. IC Role / Device Role / Timing Role: High-speed photodetector converting optical slot transitions into timing pulses for quadrature decoding. Use Value: 14/21 μs response supports >10 kHz pulse rates at 3000 RPM with 100-line disks-no external amplification needed.
Position Sensors	Miniature Switches
Use Scenario: Seat track or pedal position sensing in automotive interiors where space and thermal stability are critical. IC Role / Device Role / Timing Role: Ambient-stable phototransistor detecting emitter reflection or interruption across small air gaps. Use Value: AEC-Q102 qualification ensures operation over -40 to +100°C; low dark current (0.2 nA typ.) maintains signal integrity at high temperatures.	Use Scenario: Non-contact tactile feedback in consumer electronics (e.g., smart appliance panels, medical device UIs). IC Role / Device Role / Timing Role: Solid-state replacement for mechanical microswitches, activated by finger proximity or actuator flag. Use Value: PLCC-2 footprint (3.5 × 2.8 mm) enables ultra-compact PCB layout; lead-free reflow compatibility simplifies RoHS-compliant manufacturing.

Photo Interrupters

Rotary Encoders

Use Scenario: Object presence detection in vending machines, printers, and paper-path monitoring where beam interruption triggers event logic.

IC Role / Device Role / Timing Role: Light-sensitive switch providing digital on/off output via collector current modulation.

Use Value: ±60° angular tolerance accommodates minor misalignment during assembly; 0.6 mA I_ca drives standard logic inputs directly.

Use Scenario: Angular position feedback in motor control systems using slotted disk and emitter-detector pair.

IC Role / Device Role / Timing Role: High-speed photodetector converting optical slot transitions into timing pulses for quadrature decoding.

Use Value: 14/21 μs response supports >10 kHz pulse rates at 3000 RPM with 100-line disks-no external amplification needed.

Position Sensors

Miniature Switches

Use Scenario: Seat track or pedal position sensing in automotive interiors where space and thermal stability are critical.

IC Role / Device Role / Timing Role: Ambient-stable phototransistor detecting emitter reflection or interruption across small air gaps.

Use Value: AEC-Q102 qualification ensures operation over -40 to +100°C; low dark current (0.2 nA typ.) maintains signal integrity at high temperatures.

Use Scenario: Non-contact tactile feedback in consumer electronics (e.g., smart appliance panels, medical device UIs).

IC Role / Device Role / Timing Role: Solid-state replacement for mechanical microswitches, activated by finger proximity or actuator flag.

Use Value: PLCC-2 footprint (3.5 × 2.8 mm) enables ultra-compact PCB layout; lead-free reflow compatibility simplifies RoHS-compliant manufacturing.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
VEMT3700X02-GS18	Lower I_ca (0.35 mA typ.), same package and spectral range; slower rise time (20 μs).	Better suited for low-power, low-speed detection where signal margin is less constrained.	Select when lower irradiance or reduced speed suffices and cost optimization is prioritized.
TEMT6200FX01	Same PLCC-2 package, but higher I_ca (1.2 mA typ.) and wider viewing angle (±70°); no AEC-Q102 qualification.	Preferred for industrial non-automotive applications needing higher output or broader alignment tolerance.	Choose for non-automotive designs requiring stronger output drive or relaxed mechanical alignment.

Compared with VEMT3705X02-GS18, VEMT3700X02-GS18 trades speed and output for cost, while TEMT6200FX01 offers higher sensitivity and angular coverage but lacks automotive qualification-making VEMT3705X02-GS18 the balanced choice for AEC-Q102–required, medium-speed optical sensing.

Availability

VEMT3705X02-GS18 is available at Aetrix Electronics and suitable for photo interrupters, rotary encoders, and position sensors requiring stable component supply, automotive-grade reliability, and surface-mount manufacturability.

Supply support for VEMT3705X02-GS18 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 Semiconductors is a global manufacturer of discrete semiconductors and passive components, specializing in high-reliability optoelectronics, power MOSFETs, and precision resistors.

The VEMT3705X02-GS18 belongs to Vishay's high-speed phototransistor product line, engineered for automotive and industrial optical sensing where AEC-Q102 compliance, fast response, and wide spectral coverage are essential.

FAQ

What is the maximum operating temperature for the VEMT3705X02-GS18?

The VEMT3705X02-GS18 has an ambient temperature range of -40 °C to +100 °C and a junction temperature limit of 100 °C. Its thermal resistance is 400 K/W when soldered on a 4 mm × 4 mm PCB pad, meaning power dissipation must be derated above 25 °C ambient to stay within safe thermal limits. This makes the VEMT3705X02-GS18 suitable for under-dash automotive and industrial control environments.

Does the VEMT3705X02-GS18 require an external bias resistor?

Yes, the VEMT3705X02-GS18 requires an external collector pull-up resistor to convert photogenerated current into a measurable voltage swing. Typical values range from 1 kΩ to 10 kΩ depending on required output swing and speed-lower values improve rise/fall times but increase power consumption. The VEMT3705X02-GS18 itself contains no internal biasing circuitry.

Is the VEMT3705X02-GS18 compatible with the VSML3710 IR emitter?

Yes, the VEMT3705X02-GS18 is explicitly matched with the VSML3710 IR emitter series per Vishay documentation. Their spectral overlap (VSML3710 peak at ~940 nm; VEMT3705X02-GS18 λ_p = 950 nm), package dimensions, and angular response are co-optimized for high-coupling-efficiency photo-interrupter modules.

What does the "GS18" suffix indicate in VEMT3705X02-GS18?

The "GS18" suffix denotes tape-and-reel packaging: 8000 pieces per reel, with MOQ of 8000 pcs. It specifies antistatic blister tape per DIN IEC (CO) 564, cover tape removal force of 0.1–1.0 N, and compliance with J-STD-020 MSL 3 handling requirements-distinct from GS08 (1500 pcs/reel).

How is the collector identified on the VEMT3705X02-GS18 PLCC-2 package?

The collector (Pin 1) of the VEMT3705X02-GS18 is identified by a physical notch on the package edge, as confirmed in the official Vishay package drawing. This marking aligns with industry-standard PLCC-2 orientation and ensures correct PCB layout and automated placement verification.

VEMT3705X02-GS18 Specifications

Product attributes: Attribute value

Manufacturer:: Vishay Semiconductor Opto Division

Series:: -

Package/Case:: 2-SMD, J-Lead

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Collector Emitter Breakdown (Max):: 20 V

Current - Collector (Ic) (Max):: 50 mA

Current - Dark (Id) (Max):: 200 nA

Wavelength:: 950nm

Viewing Angle:: 120°

Power - Max:: 100 mW

Mounting Type:: Surface Mount

Orientation:: Top View

Operating Temperature:: -40°C ~ 100°C

Grade:: Automotive

Qualification:: AEC-Q102

VEMT3705X02-GS18 FAQ

1.How can I place an order for VEMT3705X02-GS18 through Aetrix?

Please submit a Request for Quotation (RFQ) for VEMT3705X02-GS18 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 VEMT3705X02-GS18 reliable?

The price and inventory of VEMT3705X02-GS18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VEMT3705X02-GS18 is usually 5 days.

3.What payment methods are accepted for VEMT3705X02-GS18?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VEMT3705X02-GS18 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for VEMT3705X02-GS18?

VEMT3705X02-GS18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your VEMT3705X02-GS18 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 VEMT3705X02-GS18?

For technical support, including VEMT3705X02-GS18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VEMT3705X02-GS18 requirements.

6.How does Aetrix verify that VEMT3705X02-GS18 is sourced from the original manufacturer or authorized distributors?

All VEMT3705X02-GS18 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 VEMT3705X02-GS18 meets industry standards.

7.What is the process for return or replacement of VEMT3705X02-GS18?

All VEMT3705X02-GS18 units undergo pre-shipment inspection (PSI). If there is an issue with VEMT3705X02-GS18, 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 VEMT3705X02-GS18 part is unused and in its original packaging.

Return procedure for VEMT3705X02-GS18:

1.Submit a request within 90 days.

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

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