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Vishay Semiconductor Opto Division VEMT3705FX02-GS18
- Part No.:
- VEMT3705FX02-GS18
- Manufacturer:
- Vishay Semiconductor Opto Division
- Category:
- Phototransistors
- Package:
- 2-SMD, J-Lead
- Datasheet:
-
VEMT3705FX02-GS18.pdf
- Description:
- PHOTO TRANS. SMD PLCC2 AECQ-101
- Quantity:
- Payment:
- Shipping:
Inventory:3,161
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Product details
Overview
VEMT3705FX02-GS18 from Vishay Semiconductors is a high-speed silicon NPN epitaxial planar phototransistor in a PLCC-2 surface-mount package, featuring AEC-Q102 qualification, ±60° angle of half sensitivity, 950 nm peak spectral sensitivity, and 0.5 mA typical collector light current under 1 mW/cm² irradiance at 950 nm - used in optical encoders and position sensors requiring daylight-blocking IR detection.
For engineers reviewing the VEMT3705FX02-GS18 datasheet, VEMT3705FX02-GS18 pinout, VEMT3705FX02-GS18 application, or VEMT3705FX02-GS18 equivalent, this page delivers verified phototransistor parameters including rise/fall time (14/21 μs), dark current (≤200 nA), spectral bandwidth (880–1050 nm), and thermal resistance (400 K/W) for reliable optocoupler and interrupter design.
Technical Context
This phototransistor operates as a light-controlled current switch with NPN bipolar junction structure, optimized for pulsed 940–950 nm IR illumination. Its integrated daylight-blocking filter suppresses visible-light interference while maintaining high responsivity across 880–1050 nm.
Designed for ambient temperature operation from −40 °C to +100 °C, it delivers fast switching (tr = 14 μs, tf = 21 μs) into 100 Ω load with low VCE(sat) (0.12–0.3 V) and low CCEO (5 pF), enabling high-frequency photo-interrupter and encoder applications up to ~35 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 20 V - maximum collector-emitter voltage before breakdown; sets safe operating range for open-collector interface circuits. |
| Ica (typ) | 0.5 mA at Ee = 1 mW/cm², λ = 950 nm - defines usable output current level for logic-level interfacing without external amplification. |
| tr / tf | 14 / 21 μs - enables reliable detection of ≥35 kHz optical pulses in encoder wheel or slot-interrupter timing systems. |
| ϕ | ±60° - angular field-of-view matching standard IR emitter alignment tolerances in compact photo-interrupter housings. |
| λ0.5 | 880–1050 nm - spectral bandwidth aligned with common 850/940/950 nm IR LEDs, rejecting ambient visible light via integrated filter. |
| RthJA | 400 K/W - thermal resistance limits power dissipation to 100 mW at Tamb ≤ 75 °C; requires minimal PCB copper area for thermal management. |
| AEC-Q102 | Qualified - validated for automotive-grade reliability including temperature cycling, humidity, and mechanical shock per AEC specification. |
Pinout & Package
PLCC-2 package (3.5 × 2.8 × 1.75 mm) with surface-mount footprint; notch on package body identifies collector terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Collector (C) | Output current sink node | Connected to load resistor or pull-up; package notch marks this pin - critical for correct orientation during automated placement. |
| Emiter (E) | Reference/ground node | Internally tied to substrate ground plane; must be connected to system GND to enable proper biasing and dark-current control. |
Key Features
| Feature | Design Value |
|---|---|
| Daylight-blocking filter | Optimized for 870–950 nm emitters - rejects >99% of visible light, eliminating false triggers in ambient-lit industrial environments. |
| Fast response time | 14 μs rise / 21 μs fall - supports real-time position feedback in motor encoders rotating at >10,000 RPM with 50-line discs. |
| PLCC-2 surface-mount form | 3.5 × 2.8 mm footprint - enables miniaturized photo-interrupter modules compatible with high-density PCB layouts and automated assembly. |
| AEC-Q102 qualification | Validated for automotive cabin and chassis applications - ensures stable performance over −40 °C to +100 °C and 1000+ thermal cycles. |
| MSL 3 moisture sensitivity | Floor life 168 h at <30 °C / <60% RH - mandates dry-pack handling but avoids baking for most SMT lines using standard J-STD-020 reflow. |
Applications
| Photo Interrupters | Miniature Switches |
|---|---|
Use Scenario: Optical beam interruption detection in vending machine coin chutes and printer paper-path sensors. IC Role / Device Role / Timing Role: Light-controlled current switch detecting presence/absence of opaque objects passing between IR emitter and detector. Use Value: High Ica (0.5 mA) and low ICEO (≤200 nA) ensure clean digital output without hysteresis or false triggering under variable ambient lighting. |
Use Scenario: Non-contact tactile feedback in medical device control panels and industrial HMI push-button replacements. IC Role / Device Role / Timing Role: Solid-state replacement for mechanical microswitches, activated by actuator flag interrupting IR path. Use Value: ±60° angular tolerance and fast tr/tf allow robust mechanical tolerance stack-up while supporting >10 Hz actuation rates. |
| Encoders | Position Sensors |
Use Scenario: Incremental rotary encoding on motor shafts in HVAC blowers and robotic joint actuators. IC Role / Device Role / Timing Role: Edge-triggered pulse generator synchronized to slotted disc rotation, feeding quadrature decoder ICs. Use Value: 14/21 μs switching enables accurate pulse capture at 35 kHz - sufficient for 50-line discs rotating at 42,000 RPM. |
Use Scenario: End-of-travel detection in linear actuators for automotive seat adjusters and smart home window lifts. IC Role / Device Role / Timing Role: Binary position indicator reporting mechanical limit reached via physical flag blocking IR path. Use Value: AEC-Q102 qualification and −40 °C to +100 °C operation guarantee reliability across vehicle cabin temperature extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar phototransistor-based optical sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| VEMT3700-GS08 | No daylight-blocking filter; broader spectral response (750–1100 nm); higher Ica (1.0 mA typ) | Suitable only in controlled lighting; prone to ambient-light interference in open environments | Select when higher output current is needed and ambient light is fully shielded. |
| TEFT4300 | TO-92 through-hole package; slower tr/tf (25/35 μs); no AEC-Q102 qualification | Limited to non-automotive, low-speed industrial controls; incompatible with SMT lines | Choose only for legacy through-hole designs where rework cost outweighs performance trade-offs. |
Compared with VEMT3705FX02-GS18, VEMT3700-GS08 offers higher sensitivity but lacks daylight rejection, while TEFT4300 provides mechanical robustness in through-hole form but sacrifices speed, qualification, and miniaturization - making VEMT3705FX02-GS18 optimal for space-constrained, automotive-grade, ambient-light-resilient optical sensing.
Availability
VEMT3705FX02-GS18 is available at Aetrix Electronics and suitable for photo interrupters, miniature switches, and position sensors requiring stable component supply, AEC-Q102 compliance, and high-volume tape-and-reel logistics.
Supply support for VEMT3705FX02-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 and passive components, specializing in high-reliability optoelectronics, power MOSFETs, and precision resistors.
The VEMT series targets compact, high-speed optical sensing applications - designed specifically for automotive, industrial, and consumer devices needing daylight-immune, surface-mount phototransistors with AEC-Q102 validation.
FAQ
What is the peak wavelength sensitivity of the VEMT3705FX02-GS18?
The VEMT3705FX02-GS18 has a peak spectral sensitivity at 950 nm, with a full spectral bandwidth (λ0.5) spanning 880 nm to 1050 nm. This matches standard 940 nm and 950 nm infrared emitters and is enhanced by an integrated daylight-blocking filter that suppresses visible-light interference - a key feature confirmed in the Vishay datasheet revision 1.0.
Is the VEMT3705FX02-GS18 qualified for automotive applications?
Yes, the VEMT3705FX02-GS18 is AEC-Q102 qualified, meaning it has passed rigorous stress tests for temperature cycling, humidity, mechanical shock, and lifetime reliability required for automotive cabin and chassis applications. This qualification is explicitly stated in the "Features" section of the official Vishay datasheet (Document Number: 80489).
What are the rise and fall times for the VEMT3705FX02-GS18?
The VEMT3705FX02-GS18 has a typical rise time (tr) of 14 μs and fall time (tf) of 21 μs, measured at VCE = 5 V, IC = 0.7 mA, λ = 940 nm, and RL = 100 Ω. These values are specified in the "Basic Characteristics" table of the Vishay datasheet and define its usable frequency limit in encoder and interrupter applications.
Does the VEMT3705FX02-GS18 have a built-in daylight-blocking filter?
Yes, the VEMT3705FX02-GS18 integrates a daylight-blocking filter matched to 870–950 nm IR emitters. This filter significantly attenuates visible light (400–700 nm), reducing false triggering in ambient-light conditions - a core feature highlighted in both the "Description" and "Features" sections of the Vishay datasheet.
What is the package type and pin identification method for the VEMT3705FX02-GS18?
The VEMT3705FX02-GS18 uses a PLCC-2 surface-mount package (3.5 × 2.8 × 1.75 mm), with the collector terminal identified by a notch on the package body. This mechanical marking is documented in the "Package Dimensions" drawing (page 4) and "Features" list of the Vishay datasheet, ensuring correct orientation during automated assembly.
VEMT3705FX02-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 pA
- 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
VEMT3705FX02-GS18 FAQ
1.How can I place an order for VEMT3705FX02-GS18 through Aetrix?
Please submit a Request for Quotation (RFQ) for VEMT3705FX02-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 VEMT3705FX02-GS18 reliable?
The price and inventory of VEMT3705FX02-GS18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VEMT3705FX02-GS18 is usually 5 days.
3.What payment methods are accepted for VEMT3705FX02-GS18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VEMT3705FX02-GS18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VEMT3705FX02-GS18?
VEMT3705FX02-GS18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VEMT3705FX02-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 VEMT3705FX02-GS18?
For technical support, including VEMT3705FX02-GS18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VEMT3705FX02-GS18 requirements.
6.How does Aetrix verify that VEMT3705FX02-GS18 is sourced from the original manufacturer or authorized distributors?
All VEMT3705FX02-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 VEMT3705FX02-GS18 meets industry standards.
7.What is the process for return or replacement of VEMT3705FX02-GS18?
All VEMT3705FX02-GS18 units undergo pre-shipment inspection (PSI). If there is an issue with VEMT3705FX02-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 VEMT3705FX02-GS18 part is unused and in its original packaging.
Return procedure for VEMT3705FX02-GS18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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