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Vishay Semiconductor Opto Division VEMT3700F-GS18
- Part No.:
- VEMT3700F-GS18
- Manufacturer:
- Vishay Semiconductor Opto Division
- Category:
- Phototransistors
- Package:
- 2-SMD, J-Lead
- Datasheet:
-
VEMT3700F-GS18.pdf
- Description:
- PHOTO TRANS. SMD PLCC2
- Quantity:
- Payment:
- Shipping:
Inventory:3,551
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Product details
Overview
VEMT3700F-GS18 from Vishay Semiconductors is a high-speed silicon NPN epitaxial planar phototransistor in a surface-mount PLCC-2 package (3.5 × 2.8 × 1.75 mm), featuring a daylight-blocking filter matched to 950 nm IR emitters, ±60° angle of half sensitivity, and 0.5 mA typical collector light current at 1 mW/cm² irradiance. It serves as the sensing element in compact optical interrupters for industrial position detection.
For engineers reviewing the VEMT3700F-GS18 datasheet, VEMT3700F-GS18 pinout, VEMT3700F-GS18 application, or VEMT3700F-GS18 equivalent, key selection criteria include its 6 µs rise/fall time with 1 kΩ load, 180 kHz cutoff frequency, spectral bandwidth (870–1050 nm), 70 V collector-emitter breakdown voltage, and MSL 3 moisture sensitivity rating for reflow compatibility.
Technical Context
The VEMT3700F-GS18 operates as a single-element NPN phototransistor with integrated daylight-blocking filter optimized for 950 nm IR illumination. Its epitaxial planar structure enables fast response (tr/tf = 6 µs @ RL = 1 kΩ) and low dark current (≤200 nA @ VCE = 20 V).
It delivers 0.5 mA collector light current under standardized conditions (Ee = 1 mW/cm², λ = 950 nm, VCE = 5 V), with peak sensitivity at 940 nm and thermal stability across −40 °C to +100 °C ambient operation. The PLCC-2 package includes a notch indicating the collector terminal and supports Pb-free reflow soldering per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Collector light current (Ica) | 0.5 mA typical at 1 mW/cm², 950 nm - defines minimum output signal level for reliable switching in photo-interrupter designs |
| Rise/fall time (tr/tf) | 6 µs @ RL = 1 kΩ - enables >100 kHz pulse detection in encoder or counter applications |
| Cut-off frequency (fc) | 180 kHz @ RL = 100 Ω - supports high-speed optical data transmission or fast-motion sensing |
| Angle of half sensitivity (ϕ) | ±60° - provides wide angular acceptance for misalignment-tolerant mechanical coupling with IR emitters |
| Spectral bandwidth (λ₀.₅) | 870–1050 nm - ensures compatibility with common 870 nm, 940 nm, and 950 nm IR LEDs while rejecting visible light |
| Collector-emitter breakdown (V(BR)CEO) | 70 V - allows safe operation in 24 V industrial control circuits with margin against transients |
| Thermal resistance (RthJA) | 400 K/W - requires minimal PCB copper area (4 mm × 4 mm pad) for thermal management at full 100 mW dissipation |
Pinout & Package
PLCC-2 surface-mount package (3.5 × 2.8 × 1.75 mm) with molded body and integral notch marking the collector side. Designed for automated placement and Pb-free reflow soldering (MSL 3, floor life 168 h).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Collector (C) | Output current sink node | Marked by package notch; connects to load resistor or pull-up; handles up to 50 mA continuous current |
| Emiter (E) | Reference/ground node | Internally connected to substrate; must be tied to system ground or lowest potential in bias network |
Key Features
| Feature | Design Value |
|---|---|
| Daylight-blocking filter | Matched to 870–950 nm IR emitters; rejects ambient visible light to prevent false triggering in unshielded environments |
| High radiant sensitivity | 0.5 mA output per 1 mW/cm² irradiance - reduces required LED drive power and extends battery life in portable sensors |
| Fast response time | 6 µs rise/fall with 1 kΩ load - enables real-time detection of moving objects at speeds >1 m/s in encoder slotted wheels |
| Angular tolerance | ±60° half-sensitivity angle - accommodates ±0.5 mm mechanical misalignment between emitter and detector in compact assemblies |
| Pb-free reflow compatibility | Rated for 260 °C peak temperature per J-STD-020 - supports modern lead-free manufacturing without derating or process modification |
Applications
| Optical Encoders | Industrial Photo Interrupters |
|---|---|
Use Scenario: Detecting slots or marks on rotating shafts in CNC machines and servo motors. IC Role / Device Role / Timing Role: Photodetector in reflective or transmissive encoder wheel assembly, converting mechanical rotation into digital pulse trains. Use Value: 180 kHz cutoff frequency and 6 µs response enable resolution up to 10,000 pulses per revolution at 1000 RPM without pulse distortion. |
Use Scenario: Object presence detection in packaging line conveyors and robotic end-effector grippers. IC Role / Device Role / Timing Role: Light-sensing element in through-beam or reflective photo-interrupter modules interfacing with PLC inputs. Use Value: ±60° angular acceptance and 0.5 mA output ensure reliable switching despite vibration-induced alignment drift in factory-floor environments. |
| Position Sensors | Miniature Switches |
Use Scenario: End-of-travel detection in linear actuators and valve position feedback in HVAC dampers. IC Role / Device Role / Timing Role: Solid-state replacement for mechanical limit switches, triggered by flag interruption of IR beam. Use Value: 70 V V(BR)CEO rating and −40 °C to +100 °C operating range support direct integration into 24 V DC control systems deployed outdoors or in hot enclosures. |
Use Scenario: Non-contact tactile feedback in medical device user interfaces and handheld test equipment. IC Role / Device Role / Timing Role: Low-profile optical switch element activated by finger or stylus blocking IR path between paired emitter/detector. Use Value: PLCC-2 footprint (3.5 × 2.8 mm) and 1.75 mm height allow integration into sub-5 mm-thick bezels without compromising mechanical durability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar phototransistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| VEMT3705F | Higher Ica (0.8 mA typ.), same PLCC-2 package, identical spectral response and angular characteristics | Delivers stronger output signal for noisy EMI environments or longer optical paths; requires no layout change | Select VEMT3705F when higher signal margin is needed; it is Vishay's designated EOL replacement for VEMT3700F-GS18 |
| QSE159 | TO-92 through-hole package, slower tr/tf (15 µs), wider spectral bandwidth (700–1100 nm), no daylight filter | Requires PCB through-hole mounting and external optical filtering; less suitable for ambient-light-rich settings | Choose QSE159 only for legacy through-hole designs where re-layout is prohibitive and ambient light is controlled |
Compared with VEMT3700F-GS18, VEMT3705F offers 60% higher light current with identical form factor and thermal specs-ideal for upgrading existing designs pre-EOL, while QSE159 trades speed and ambient rejection for through-hole compatibility and broader spectral response.
Availability
VEMT3700F-GS18 is available at Aetrix Electronics and suitable for optical encoders, industrial photo interrupters, and position sensors requiring stable component supply before its February 2025 end-of-life date.
Supply support for VEMT3700F-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 leader in discrete semiconductors, specializing in optoelectronics, power MOSFETs, diodes, and resistive components for industrial, automotive, and computing applications.
The VEMT3700F-GS18 belongs to Vishay's high-speed phototransistor family designed specifically for compact, high-reliability optical sensing in space-constrained industrial automation and motion control systems.
FAQ
What is the end-of-life timeline for VEMT3700F-GS18?
VEMT3700F-GS18 has an official end-of-life date of February 2025 per Vishay documentation (Rev. 1.7, 31-Jan-2025). Last-time-buy opportunities and cross-reference support to VEMT3705F are available through Aetrix Electronics' lifecycle management program for VEMT3700F-GS18 customers.
Does VEMT3700F-GS18 require external filtering for indoor ambient light rejection?
No - VEMT3700F-GS18 integrates a daylight-blocking filter matched to 870–950 nm IR emitters, enabling reliable operation under fluorescent and LED room lighting without additional optics. This built-in filter is confirmed in the "Features" section of the Vishay datasheet (Document Number: 81584).
What is the maximum allowable collector current for continuous operation of VEMT3700F-GS18?
The absolute maximum continuous collector current for VEMT3700F-GS18 is 50 mA at Tamb = 25 °C, as specified in the Absolute Maximum Ratings table. Derating is required above 25 °C per the thermal resistance (RthJA = 400 K/W) and power dissipation limit curve shown in Figure 1 of the datasheet.
Is VEMT3700F-GS18 compatible with standard Pb-free reflow profiles?
Yes - VEMT3700F-GS18 is qualified for Pb-free reflow soldering per J-STD-020, with a peak temperature of 260 °C (Figure 10). Its MSL 3 rating and 168-hour floor life under ≤30 °C / ≤60% RH are explicitly documented in the "DRYPACK" and "FLOOR LIFE" sections of the datasheet.
How does the ±60° angle of half sensitivity impact mechanical design of photo-interrupter assemblies?
The ±60° angle of half sensitivity in VEMT3700F-GS18 allows up to ±0.5 mm lateral misalignment between emitter and detector without significant signal loss - simplifying mechanical tolerancing and reducing assembly cost in high-volume photo-interrupter modules using matched VSML3710 IR emitters.
VEMT3700F-GS18 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Semiconductor Opto Division
- Series:
- -
- Package/Case:
- 2-SMD, J-Lead
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Voltage - Collector Emitter Breakdown (Max):
- 70 V
- Current - Collector (Ic) (Max):
- 50 mA
- Current - Dark (Id) (Max):
- 200 nA
- Wavelength:
- 940nm
- Viewing Angle:
- 120°
- Power - Max:
- 100 mW
- Mounting Type:
- Surface Mount
- Orientation:
- Top View
- Operating Temperature:
- -40°C ~ 100°C
- Grade:
- -
- Qualification:
- -
VEMT3700F-GS18 FAQ
1.How can I place an order for VEMT3700F-GS18 through Aetrix?
Please submit a Request for Quotation (RFQ) for VEMT3700F-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 VEMT3700F-GS18 reliable?
The price and inventory of VEMT3700F-GS18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VEMT3700F-GS18 is usually 5 days.
3.What payment methods are accepted for VEMT3700F-GS18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VEMT3700F-GS18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VEMT3700F-GS18?
VEMT3700F-GS18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VEMT3700F-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 VEMT3700F-GS18?
For technical support, including VEMT3700F-GS18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VEMT3700F-GS18 requirements.
6.How does Aetrix verify that VEMT3700F-GS18 is sourced from the original manufacturer or authorized distributors?
All VEMT3700F-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 VEMT3700F-GS18 meets industry standards.
7.What is the process for return or replacement of VEMT3700F-GS18?
All VEMT3700F-GS18 units undergo pre-shipment inspection (PSI). If there is an issue with VEMT3700F-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 VEMT3700F-GS18 part is unused and in its original packaging.
Return procedure for VEMT3700F-GS18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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