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Vishay Semiconductor Opto Division VEMT3700F-GS08
- Part No.:
- VEMT3700F-GS08
- Manufacturer:
- Vishay Semiconductor Opto Division
- Category:
- Phototransistors
- Package:
- 2-LCC (J-Lead)
- Datasheet:
-
VEMT3700F-GS08.pdf
- Description:
- SENSOR PHOTO 940NM TOP VIEW 2LCC
- Quantity:
- Payment:
- Shipping:
Inventory:13,712
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Product details
Overview
VEMT3700F-GS08 from Vishay Semiconductors is a high-speed silicon NPN epitaxial planar phototransistor in PLCC-2 surface-mount package, featuring 940 nm peak sensitivity, ±60° half-sensitivity angle, 0.5 mA typical collector light current at 1 mW/cm² irradiance, and 6 μs rise/fall time with 1 kΩ load. It serves as the sensing element in compact photo interrupters for industrial encoders and position sensors.
For engineers reviewing the VEMT3700F-GS08 datasheet, VEMT3700F-GS08 pinout, VEMT3700F-GS08 application, or VEMT3700F-GS08 equivalent, key selection criteria include radiant sensitivity matching 950 nm IR emitters, daylight-blocking filter performance, thermal resistance (400 K/W), and MSL 3 moisture sensitivity compliance for reflow assembly.
Technical Context
The VEMT3700F-GS08 operates as a single-element NPN phototransistor with integrated daylight-blocking optical filter optimized for 870–950 nm IR emitters. Its epitaxial planar structure enables fast response (2 μs tr/tf with 100 Ω load) and low dark current (≤200 nA at VCE = 20 V).
It delivers 180 kHz cutoff frequency under VS = 5 V, IC = 2 mA, RL = 100 Ω conditions and maintains stable spectral response across –40 °C to +100 °C ambient range, with relative collector current variation ≤±20% over that range per Fig. 3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Device Type | Silicon NPN phototransistor with integrated daylight-blocking filter |
| Peak Sensitivity Wavelength | 940 nm - matches common 950 nm IR emitters (e.g., VSML3710) |
| Collector Light Current (Ica) | 0.5 mA typ. at Ee = 1 mW/cm², λ = 950 nm, VCE = 5 V - defines minimum detectable signal level |
| Rise/Fall Time | 6 μs typ. (RL = 1 kΩ); 2 μs typ. (RL = 100 Ω) - determines maximum switching frequency in interrupter designs |
| Angle of Half Sensitivity | ±60° - defines usable field-of-view for mechanical alignment tolerance in slot-type sensors |
| Ambient Temperature Range | –40 °C to +100 °C - supports operation in industrial motor control and automotive cabin environments |
| Thermal Resistance (RthJA) | 400 K/W - requires ≥4 mm × 4 mm copper pad for full 100 mW power dissipation capability |
Pinout & Package
PLCC-2 surface-mount package (3.5 × 2.8 × 1.75 mm); notch on package body indicates collector terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Collector | Output current sink node | Marked by package notch; connects to load resistor or pull-up; handles up to 50 mA DC / 100 mA peak |
| Emiter | Reference/ground node | Connected to system ground; forms base-emitter junction with internal photodiode; no external bias required |
Key Features
| Feature | Design Value |
|---|---|
| Daylight-blocking filter | Optimized for 870–950 nm emitters - rejects visible light to prevent false triggering in ambient-lit environments |
| Fast transient response | 2 μs tr/tf with 100 Ω load - enables >100 kHz pulse detection in high-speed encoder applications |
| MSL 3 moisture sensitivity | Floor life 168 h at <30 °C / <60% RH - mandates dry-pack handling and bake-before-reflow if exposed beyond limit |
| Lead (Pb)-free reflow compatibility | Rated for 260 °C peak soldering temperature per J-STD-020 - supports standard lead-free SMT processes |
| Angular sensitivity profile | ±60° half-sensitivity angle - allows ±1.2 mm positional tolerance at 2 mm air gap in photo-interrupter design |
Applications
| Industrial Encoders | Miniature Position Sensors |
|---|---|
Use Scenario: Detecting rotation of metal or plastic slotted discs in servo motors and CNC axes. IC Role / Device Role / Timing Role: Phototransistor output stage converting IR beam interruption into digital edge signals for quadrature decoding. Use Value: ±60° angular tolerance and 6 μs response enable reliable 500–2000 PPR resolution without optical collimation. |
Use Scenario: Monitoring end-of-travel or latch engagement in compact actuators and medical devices. IC Role / Device Role / Timing Role: Light-barrier sensor detecting physical obstruction in sub-10 mm form factor assemblies. Use Value: PLCC-2 footprint (3.5 × 2.8 mm) and daylight filter allow direct integration into space-constrained housings with ambient light exposure. |
| Photo Interrupters | Optical Counters |
Use Scenario: Object counting on conveyor belts using U-shaped or slot-type interrupter modules. IC Role / Device Role / Timing Role: High-sensitivity IR receiver paired with 950 nm emitter to detect opaque objects at 1–5 mm gaps. Use Value: 0.5 mA Ica ensures clean TTL-compatible output swing with standard 10 kΩ pull-up, minimizing external amplification. |
Use Scenario: Pulse counting in utility metering, vending machines, and packaging equipment. IC Role / Device Role / Timing Role: Edge-triggered input device converting mechanical motion into countable logic transitions. Use Value: Low dark current (≤200 nA) prevents false counts during long idle periods; 100 °C max operating temp supports sealed meter enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar phototransistor sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| VEMT3705F | Higher Ica (0.8 mA typ.), wider λ₀.₅ (850–1050 nm), same PLCC-2 package and pinout | Better SNR in low-irradiance or misaligned emitter-receiver setups; identical mounting and layout | Select VEMT3705F for new designs requiring higher sensitivity margin or extended spectral tolerance; it is Vishay's designated EOL replacement. |
| QSE159 | TO-92 through-hole package, slower tr/tf (15 μs), no daylight filter, λₚ = 880 nm | Requires PCB through-hole mounting and external optical shielding; lower cost but larger footprint | Choose QSE159 only for legacy through-hole systems where rework to SMT is impractical; not drop-in compatible. |
Compared with VEMT3700F-GS08, VEMT3705F offers higher radiant sensitivity and broader spectral match while maintaining identical package, pinout, and thermal characteristics-making it a seamless upgrade path before February 2025 EOL. QSE159 provides basic phototransistor functionality but lacks daylight rejection, speed, and SMT compatibility.
Availability
VEMT3700F-GS08 is available at Aetrix Electronics and suitable for industrial encoders, miniature position sensors, and optical counters requiring stable component supply ahead of its End-of-Life date in February 2025.
Supply support for VEMT3700F-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, specializing in optoelectronics, MOSFETs, diodes, and resistive components with emphasis on reliability and precision in harsh environments.
The VEMT3700F-GS08 belongs to Vishay's high-speed phototransistor product line designed specifically for compact, high-reliability optical sensing in industrial automation and motion control systems.
FAQ
What is the End-of-Life timeline for VEMT3700F-GS08?
VEMT3700F-GS08 has an official End-of-Life date of February 2025 per Vishay document 81584 rev. 1.7. Last-time-buy opportunities and remaining inventory allocations are managed by Aetrix Electronics with full traceability. Customers are advised to transition to VEMT3705F for new designs before this date.
Does VEMT3700F-GS08 require an external bias resistor?
No, VEMT3700F-GS08 operates as a two-terminal phototransistor: emitter connects to ground and collector drives the load. A pull-up resistor (typically 1–10 kΩ) is required on the collector to generate a logic-level output voltage swing. No base connection or bias network is needed.
What is the significance of the PLCC-2 package notch for VEMT3700F-GS08?
The physical notch on the VEMT3700F-GS08 PLCC-2 package unambiguously identifies the collector terminal per Vishay's mechanical drawing. This marking eliminates orientation errors during automated placement and ensures correct polarity when routing traces on the PCB.
Can VEMT3700F-GS08 be used with 850 nm IR emitters?
Yes - VEMT3700F-GS08's spectral bandwidth (870–1050 nm) fully covers 850 nm emitters, though peak sensitivity is at 940 nm. Performance remains robust: Ica drops ≤15% versus 950 nm at equal irradiance, per Fig. 8 spectral sensitivity curve.
How does the daylight-blocking filter in VEMT3700F-GS08 improve system reliability?
The integrated daylight-blocking filter attenuates visible light (400–700 nm) by >99% while transmitting >80% of 950 nm IR. This prevents false triggering in environments with fluorescent lighting, sunlight, or indicator LEDs - a critical advantage over unfiltered phototransistors like QSE159.
VEMT3700F-GS08 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Semiconductor Opto Division
- Series:
- -
- Package/Case:
- 2-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Collector Emitter Breakdown (Max):
- -
- 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:
- Automotive
- Qualification:
- AEC-Q100
VEMT3700F-GS08 FAQ
1.How can I place an order for VEMT3700F-GS08 through Aetrix?
Please submit a Request for Quotation (RFQ) for VEMT3700F-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 VEMT3700F-GS08 reliable?
The price and inventory of VEMT3700F-GS08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VEMT3700F-GS08 is usually 5 days.
3.What payment methods are accepted for VEMT3700F-GS08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VEMT3700F-GS08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VEMT3700F-GS08?
VEMT3700F-GS08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VEMT3700F-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 VEMT3700F-GS08?
For technical support, including VEMT3700F-GS08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VEMT3700F-GS08 requirements.
6.How does Aetrix verify that VEMT3700F-GS08 is sourced from the original manufacturer or authorized distributors?
All VEMT3700F-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 VEMT3700F-GS08 meets industry standards.
7.What is the process for return or replacement of VEMT3700F-GS08?
All VEMT3700F-GS08 units undergo pre-shipment inspection (PSI). If there is an issue with VEMT3700F-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 VEMT3700F-GS08 part is unused and in its original packaging.
Return procedure for VEMT3700F-GS08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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