My Inquiry
My Account
Vishay Semiconductor Opto Division VEMT3705FX02-GS08
- Part No.:
- VEMT3705FX02-GS08
- Manufacturer:
- Vishay Semiconductor Opto Division
- Category:
- Phototransistors
- Package:
- 2-SMD, J-Lead
- Datasheet:
-
VEMT3705FX02-GS08.pdf
- Description:
- PHOTO TRANS. SMD PLCC2 AECQ-101
- Quantity:
- Payment:
- Shipping:
Inventory:3,203
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
VEMT3705FX02-GS08 from Vishay Semiconductors is a high-speed silicon NPN epitaxial planar phototransistor in a PLCC-2 surface-mount package, featuring an integrated daylight-blocking filter matched to 950 nm IR emitters, ±60° angle of half sensitivity, and 0.5 mA typical collector light current under 1 mW/cm² irradiance at 950 nm - used in optical encoders and miniature position sensors.
For engineers reviewing the VEMT3705FX02-GS08 datasheet, VEMT3705FX02-GS08 pinout, VEMT3705FX02-GS08 application, or VEMT3705FX02-GS08 equivalent, key selection criteria include spectral response (880–1050 nm), fast rise/fall times (14/21 μs), AEC-Q102 qualification, and PLCC-2 mechanical compatibility with VSML3710 IR emitters.
Technical Context
This phototransistor operates as a light-controlled current switch with NPN bipolar junction structure, optimized for pulsed infrared detection. Its epitaxial planar construction enables stable performance across -40 °C to +100 °C ambient temperature, while the integrated daylight-blocking filter suppresses visible-light interference.
The device delivers linear photoresponse up to 0.5 mA collector current under standard test conditions (Ee = 1 mW/cm², λ = 950 nm, VCE = 5 V), with low dark current (≤200 nA) and minimal capacitance (5 pF), supporting high-speed switching in encoder and interrupter topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 20 V - maximum collector-emitter voltage before breakdown; defines safe operating range in open-collector interface circuits |
| Ica (typ) | 0.5 mA - typical collector light current at 1 mW/cm², 950 nm irradiance; determines minimum load resistor sizing for digital logic interfacing |
| ϕ (half sensitivity) | ±60° - angular field-of-view; sets mechanical alignment tolerance in reflective/photo-interrupter sensor assemblies |
| λ0.5 | 880 to 1050 nm - full spectral bandwidth; ensures compatibility with common 850 nm, 870 nm, and 940 nm IR emitters |
| tr/tf | 14 / 21 μs - rise/fall time at VCE = 5 V, RL = 100 Ω; supports >10 kHz pulse detection in incremental encoder channels |
| RthJA | 400 K/W - thermal resistance junction-to-ambient on 4 mm × 4 mm PCB pad; limits continuous power dissipation to ≤100 mW at Tamb ≤ 75 °C |
| AEC-Q102 | Qualified - validated for automotive-grade reliability including temperature cycling, humidity bias, and ESD robustness |
Pinout & Package
Package: PLCC-2 surface-mount package (3.5 × 2.8 × 1.75 mm), notch-marked to indicate collector terminal. RoHS-compliant, lead (Pb)-free reflow solderable per J-STD-020 MSL 3 (168 h floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Collector (notch side) | Output current sink node | Connected to pull-up resistor or logic input; polarity and marking ensure correct orientation during automated placement |
| Emiter | Reference/ground node | Bonded to substrate ground plane; requires low-impedance return path to minimize noise coupling in high-speed detection |
Key Features
| Feature | Design Value |
|---|---|
| Daylight-blocking filter | Optimized spectral rejection outside 880–1050 nm band; eliminates false triggering under ambient indoor lighting |
| Fast transient response | 14 μs rise / 21 μs fall time enables reliable decoding of 10–20 kHz encoder signals without pulse distortion |
| AEC-Q102 qualification | Validated for automotive cabin and chassis applications requiring extended temperature operation and long-term reliability |
| PLCC-2 mechanical compatibility | Standardized footprint aligns with Vishay's VSML3710 IR emitter series for co-packaged optocoupler modules |
| Low dark current | ≤200 nA at VCE = 20 V ensures stable high-impedance off-state in battery-powered position sensing |
Applications
| Photo Interrupters | Miniature Switches |
|---|---|
Use Scenario: Object detection in printer paper-path sensors and vending machine dispensing gates. IC Role / Device Role / Timing Role: Light-sensitive current switch that toggles output state when IR beam is interrupted. Use Value: ±60° angular tolerance accommodates mechanical misalignment; 0.5 mA output current directly drives Schmitt-trigger inputs without amplification. | Use Scenario: Non-contact tactile feedback in industrial HMI panels and medical device control knobs. IC Role / Device Role / Timing Role: Solid-state replacement for mechanical microswitches, activated by reflected IR from actuator movement. Use Value: AEC-Q102 qualification ensures >10⁶ cycle reliability; daylight filter prevents false triggers under fluorescent lighting. |
| Encoders | Position Sensors |
Use Scenario: Quadrature signal generation in motor shaft rotation tracking for BLDC commutation. IC Role / Device Role / Timing Role: Edge-detecting photodetector in slotted disk-based optical encoder wheels. Use Value: 14/21 μs switching speed supports >15 kHz edge rates; spectral match to 940 nm emitters minimizes crosstalk between adjacent channels. | Use Scenario: Linear or angular position feedback in HVAC damper actuators and robotic joint encoders. IC Role / Device Role / Timing Role: Analog or digital position transducer converting mechanical displacement into modulated photocurrent. Use Value: 880–1050 nm bandwidth allows use with multiple emitter wavelengths; low CCEO (5 pF) preserves signal integrity at >1 MHz modulation frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar phototransistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| VEMT3700-GS08 | Same PLCC-2 package, but no daylight-blocking filter; broader spectral response (750–1100 nm) | Higher susceptibility to ambient light interference; suitable only in shielded or dark environments | Select when cost sensitivity outweighs ambient light rejection needs and emitter wavelength is fixed at 850 nm |
| QSE113 | Through-hole TO-92 package; slower response (tr/tf ≈ 25/35 μs); no AEC-Q102 qualification | Limited to non-automotive, low-density PCBs; not suitable for SMT production or high-vibration environments | Choose only for legacy through-hole designs where rework cost exceeds redesign effort |
Compared with VEMT3705FX02-GS08, VEMT3700-GS08 trades spectral filtering for wider wavelength flexibility, while QSE113 sacrifices surface-mount compatibility and automotive qualification for legacy footprint support - neither offers pin-to-pin equivalence or identical optical performance.
Availability
VEMT3705FX02-GS08 is available at Aetrix Electronics and suitable for photo interrupters, encoders, and position sensors requiring stable component supply, AEC-Q102 compliance, and high-volume tape-and-reel delivery (7500 pcs/reel).
Supply support for VEMT3705FX02-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 Semiconductors is a global leader in discrete semiconductors and passive components, specializing in high-reliability optoelectronics, power MOSFETs, and precision resistors.
The VEMT3705FX02-GS08 belongs to Vishay's high-speed phototransistor product line, engineered for automotive and industrial motion-sensing applications demanding robust ambient-light rejection and tight spectral matching to IR emitters.
FAQ
What is the peak sensitivity wavelength of the VEMT3705FX02-GS08?
The VEMT3705FX02-GS08 has a peak sensitivity wavelength of 950 nm, confirmed in the Basic Characteristics table. This value is critical for optimal pairing with 940–950 nm IR emitters like the VSML3710. The spectral bandwidth spans 880–1050 nm, ensuring consistent response across common near-infrared sources. The VEMT3705FX02-GS08 achieves maximum responsivity precisely at 950 nm, enabling highest signal-to-noise ratio in encoder and interrupter configurations.
Is the VEMT3705FX02-GS08 qualified for automotive applications?
Yes, the VEMT3705FX02-GS08 is AEC-Q102 qualified, as explicitly stated in the Features section and verified in the Absolute Maximum Ratings table. This qualification covers temperature cycling, high-temperature operating life, and ESD testing required for automotive cabin and chassis applications. The VEMT3705FX02-GS08 operates reliably from -40 °C to +100 °C ambient, meeting stringent automotive environmental requirements without derating.
What does the "GS08" suffix indicate in VEMT3705FX02-GS08?
The "GS08" suffix denotes tape-and-reel packaging per Vishay's ordering convention: 7500 pieces per reel, 1500 pieces per tape segment, compliant with DIN IEC (CO) 564 blister tape standards. This packaging format supports high-speed SMT placement and is distinct from GS18 (8000 pcs/reel). The VEMT3705FX02-GS08 uses antistatic blister tape with adhesive cover tape and meets J-STD-020 moisture sensitivity level 3 (168 h floor life).
How is the collector terminal identified on the VEMT3705FX02-GS08 PLCC-2 package?
The collector terminal of the VEMT3705FX02-GS08 is identified by a physical notch on the PLCC-2 package body, as specified in the Features list and confirmed in the Package Dimensions diagram. This marking aligns with industry-standard orientation conventions for dual-terminal phototransistors. The VEMT3705FX02-GS08 must be placed with the notch oriented toward the collector pull-up resistor to ensure correct circuit operation and avoid reverse-bias damage.
What is the maximum allowable ambient temperature for continuous operation of the VEMT3705FX02-GS08?
The VEMT3705FX02-GS08 supports continuous operation from -40 °C to +100 °C ambient temperature, as defined in the Absolute Maximum Ratings table. At +100 °C, power dissipation must be limited to ≤100 mW (derated per Fig. 1), and thermal resistance junction-to-ambient is 400 K/W on a 4 mm × 4 mm PCB pad. The VEMT3705FX02-GS08 maintains specified electrical parameters within this full range, validated per AEC-Q102 test conditions.
VEMT3705FX02-GS08 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-GS08 FAQ
1.How can I place an order for VEMT3705FX02-GS08 through Aetrix?
Please submit a Request for Quotation (RFQ) for VEMT3705FX02-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 VEMT3705FX02-GS08 reliable?
The price and inventory of VEMT3705FX02-GS08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VEMT3705FX02-GS08 is usually 5 days.
3.What payment methods are accepted for VEMT3705FX02-GS08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VEMT3705FX02-GS08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VEMT3705FX02-GS08?
VEMT3705FX02-GS08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VEMT3705FX02-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 VEMT3705FX02-GS08?
For technical support, including VEMT3705FX02-GS08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VEMT3705FX02-GS08 requirements.
6.How does Aetrix verify that VEMT3705FX02-GS08 is sourced from the original manufacturer or authorized distributors?
All VEMT3705FX02-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 VEMT3705FX02-GS08 meets industry standards.
7.What is the process for return or replacement of VEMT3705FX02-GS08?
All VEMT3705FX02-GS08 units undergo pre-shipment inspection (PSI). If there is an issue with VEMT3705FX02-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 VEMT3705FX02-GS08 part is unused and in its original packaging.
Return procedure for VEMT3705FX02-GS08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
VEMT3705FX02-GS08 Tags
-
ALS-PT19-315C/L177/TR8
Everlight Electronics Co Ltd
-
PT19-21C/L41/TR8
Everlight Electronics Co Ltd
-
PT12-21C/TR8
Everlight Electronics Co Ltd
-
PT12-21B/TR8
Everlight Electronics Co Ltd
-
ALS-PT204-6C/L177
Everlight Electronics Co Ltd
.jpg)
-
APA3010P3BT-GX
Kingbright
-
PT26-51B/TR8(DGK)
Everlight Electronics Co Ltd
-
OP550A
TT Electronics/Optek Technology
-
OP505A
TT Electronics/Optek Technology
-
OP598A
TT Electronics/Optek Technology
-
PT42-21B/TR8
Everlight Electronics Co Ltd
-
QSB363ZR
onsemi
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
