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Vishay Semiconductor Opto Division VEMT3705F-GS18
- Part No.:
- VEMT3705F-GS18
- Manufacturer:
- Vishay Semiconductor Opto Division
- Category:
- Phototransistors
- Package:
- 2-SMD, J-Lead
- Datasheet:
-
VEMT3705F-GS18.pdf
- Description:
- PHOTO TRANS. SMD PLCC2
- Quantity:
- Payment:
- Shipping:
Inventory:1,998
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Product details
Overview
VEMT3705F-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 under 1 mW/cm² irradiance at 950 nm. It is used in compact optical sensing applications such as photo interrupters and position sensors.
For engineers reviewing the VEMT3705F-GS18 datasheet, VEMT3705F-GS18 pinout, VEMT3705F-GS18 application, or VEMT3705F-GS18 equivalent, key selection criteria include spectral response range (880–1050 nm), fast rise/fall times (14/21 μs), low dark current (≤200 nA), and MSL 3 moisture sensitivity compliance for reflow assembly.
Technical Context
The VEMT3705F-GS18 operates as a single-element NPN phototransistor with emitter-grounded configuration and collector output. Its integrated daylight-blocking filter suppresses visible-light interference while optimizing responsivity to near-infrared radiation between 880 nm and 1050 nm, peaking at 950 nm.
It delivers 0.5 mA collector light current at 5 V VCE under standardized 950 nm illumination (1 mW/cm²), with saturation voltage ≤0.3 V at 0.1 mA load and junction-to-ambient thermal resistance of 400 K/W when soldered on a 4 mm × 4 mm PCB pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 20 V - Maximum safe collector-emitter voltage before breakdown; defines upper rail limit in open-collector switching circuits. |
| Ica (typ) | 0.5 mA - Typical photocurrent output under 1 mW/cm² @ 950 nm; determines minimum detectable signal level in optocoupled logic. |
| ϕ (half-sensitivity) | ±60° - Angular field-of-view where responsivity drops to 50%; enables reliable alignment tolerance in encoder slotted wheels. |
| tr/tf | 14 / 21 μs - Rise/fall time into 100 Ω load; supports >10 kHz pulse detection in high-speed counting applications. |
| λ0.5 | 880–1050 nm - Full spectral bandwidth at half-maximum sensitivity; ensures compatibility with common 850 nm, 870 nm, and 940 nm IR emitters. |
| RthJA | 400 K/W - Thermal resistance from junction to ambient on standard 4 mm × 4 mm copper pad; informs derating above 25 °C ambient. |
| MSL Level | Level 3 per J-STD-020 - Requires dry-pack handling and ≤168 h floor life before reflow; impacts SMT line planning and storage protocols. |
Pinout & Package
Package: PLCC-2 surface-mount package (3.5 × 2.8 × 1.75 mm) with notch indicating collector terminal. Designed for automated placement and lead-free reflow (peak 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Collector (C) | Output node, connected to load resistor or pull-up | Notch-marked terminal; carries photocurrent; must be biased ≤20 V relative to emitter for safe operation. |
| Emitter (E) | Reference/ground node | Common return path; tied to system ground or bias reference; establishes VCE across phototransistor junction. |
Key Features
| Feature | Design Value |
|---|---|
| Daylight-blocking filter | Optimized rejection of visible spectrum (400–700 nm); enables stable operation under ambient lighting without external shielding. |
| Fast transient response | 14 μs rise / 21 μs fall into 100 Ω load; supports real-time detection of rapidly moving objects in industrial encoders. |
| Angular sensitivity profile | ±60° half-sensitivity angle; allows ±10° mechanical misalignment tolerance in photo-interrupter mounting without signal loss. |
| IR emitter matching | Filter matched to VSML3710 and other 870–950 nm emitters; guarantees optimal coupling efficiency in paired opto-modules. |
| Moisture-sensitive packaging | MSL 3, 168 h floor life; requires controlled humidity storage and bake-out if exposed beyond limit-critical for high-reliability manufacturing. |
Applications
| Photo Interrupters | Miniature Switches |
|---|---|
Use Scenario: Slotted disk rotating between emitter and detector in printer paper-path sensing. IC Role / Device Role / Timing Role: Phototransistor output switches digital input on presence/absence of IR beam interruption. Use Value: 0.5 mA output current drives standard logic inputs directly; ±60° angular tolerance accommodates mechanical stack-up in compact assemblies. |
Use Scenario: Push-button actuation via flag blocking IR path in handheld medical device UI. IC Role / Device Role / Timing Role: Binary on/off detection element replacing mechanical microswitches in space-constrained designs. Use Value: Fast 14 μs rise time enables sub-millisecond response; PLCC-2 footprint (3.5 × 2.8 mm) saves >60% board area vs. through-hole alternatives. |
| Encoders | Position Sensors |
Use Scenario: Quadrature track reading on motor shaft encoder disk with dual VEMT3705F-GS18 detectors. IC Role / Device Role / Timing Role: High-speed edge detection node feeding quadrature decoder IC or MCU timer capture input. Use Value: 10 kHz+ pulse capability supports >3000 RPM shaft speeds; spectral match to 940 nm emitters minimizes crosstalk in multi-channel layouts. |
Use Scenario: Linear position feedback in HVAC damper actuator using calibrated slit pattern on moving vane. IC Role / Device Role / Timing Role: Analog-level light-current transducer feeding ADC or comparator for threshold-based position reporting. Use Value: 880–1050 nm bandwidth rejects fluorescent lamp noise; 0.2 nA typical dark current ensures <0.1% offset drift over -40 to +100 °C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar phototransistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TEFT4300 | TO-92 through-hole package; slower 25 μs rise time; no integrated daylight filter. | Requires external IR filter and mechanical mounting; unsuitable for ultra-compact SMT designs. | Select when legacy through-hole assembly or cost-driven prototyping outweighs size/speed requirements. |
| QSE159 | PLCC-2 package; 0.35 mA Ica (typ); ±35° angular sensitivity; no MSL rating specified. | Narrower field-of-view demands tighter optical alignment; lacks documented reflow compliance data. | Prefer only in low-speed, manually aligned systems where ambient light control is guaranteed. |
Compared with TEFT4300 and QSE159, the VEMT3705F-GS18 provides superior speed, built-in daylight rejection, and verified MSL 3 handling-making it the preferred choice for production-grade SMT optical sensing where reliability, miniaturization, and ambient robustness are critical.
Availability
VEMT3705F-GS18 is available at Aetrix Electronics and suitable for photo interrupters, miniature switches, and position sensors requiring stable component supply, consistent PLCC-2 tape-and-reel delivery (8000 pcs/reel), and full traceability from Vishay's certified production line.
Supply support for VEMT3705F-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 VEMT3705F-GS18 belongs to Vishay's high-speed phototransistor family engineered for compact, ambient-light-immune optical sensing in industrial automation, consumer electronics, and automotive subsystems.
FAQ
What is the maximum allowable collector-emitter voltage for VEMT3705F-GS18?
The absolute maximum collector-emitter voltage (VCEO) for VEMT3705F-GS18 is 20 V at Tamb = 25 °C. Exceeding this value risks permanent junction breakdown. Derating is required above 25 °C ambient per the power dissipation curve in Figure 1 of the datasheet, where RthJA = 400 K/W governs thermal limits.
Does VEMT3705F-GS18 require an external daylight-blocking filter?
No, VEMT3705F-GS18 integrates a daylight-blocking filter matched to 870–950 nm IR emitters. This eliminates the need for external optical filters in most applications, reducing bill-of-materials count and assembly complexity while maintaining stable performance under indoor ambient lighting.
What is the spectral response range of VEMT3705F-GS18?
VEMT3705F-GS18 has a spectral bandwidth (λ0.5) from 880 nm to 1050 nm, with peak sensitivity at 950 nm. This range ensures strong compatibility with common infrared emitters including VSML3710, TSAL6100, and similar 850–940 nm devices used in industrial and consumer optocoupling.
How does the ±60° angle of half sensitivity affect optical design with VEMT3705F-GS18?
The ±60° angle of half sensitivity means VEMT3705F-GS18 maintains ≥50% of peak responsivity within a 120° total cone. This allows ±10° mechanical misalignment tolerance in photo-interrupter assemblies and simplifies optical alignment during manufacturing-reducing yield loss in high-volume SMT production.
Is VEMT3705F-GS18 compatible with lead-free reflow processes?
Yes, VEMT3705F-GS18 is qualified for lead-free reflow soldering with a peak temperature of 260 °C, compliant with J-STD-020. Its PLCC-2 package uses Pb-free terminations, and the recommended profile (Figure 10) specifies ramp rates, soak time, and dwell duration to prevent thermal damage or delamination.
VEMT3705F-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:
- -
- Qualification:
- -
VEMT3705F-GS18 FAQ
1.How can I place an order for VEMT3705F-GS18 through Aetrix?
Please submit a Request for Quotation (RFQ) for VEMT3705F-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 VEMT3705F-GS18 reliable?
The price and inventory of VEMT3705F-GS18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VEMT3705F-GS18 is usually 5 days.
3.What payment methods are accepted for VEMT3705F-GS18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VEMT3705F-GS18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VEMT3705F-GS18?
VEMT3705F-GS18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VEMT3705F-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 VEMT3705F-GS18?
For technical support, including VEMT3705F-GS18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VEMT3705F-GS18 requirements.
6.How does Aetrix verify that VEMT3705F-GS18 is sourced from the original manufacturer or authorized distributors?
All VEMT3705F-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 VEMT3705F-GS18 meets industry standards.
7.What is the process for return or replacement of VEMT3705F-GS18?
All VEMT3705F-GS18 units undergo pre-shipment inspection (PSI). If there is an issue with VEMT3705F-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 VEMT3705F-GS18 part is unused and in its original packaging.
Return procedure for VEMT3705F-GS18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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