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Vishay Semiconductor Opto Division TLHG4205
- Part No.:
- TLHG4205
- Manufacturer:
- Vishay Semiconductor Opto Division
- Category:
- LED Indication - Discrete
- Package:
- Radial
- Datasheet:
-
TLHG4205.pdf
- Description:
- LED GREEN CLEAR T-1 T/H
- Quantity:
- Payment:
- Shipping:
Inventory:2,295
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Product details
Overview
TLHG4205 from Vishay Semiconductor is a high-speed, surface-mount infrared LED with 940 nm peak emission wavelength, 50 mW radiant power, and 20° viewing angle, used in proximity sensing and IR data transmission systems.
For engineers reviewing the TLHG4205 datasheet, TLHG4205 pinout, TLHG4205 application, or TLHG4205 equivalent, key selection criteria include radiant intensity at 100 mA, forward voltage drop, thermal resistance, and compatibility with standard IR receiver ICs such as TSOP38238.
Technical Context
The TLHG4205 operates with a forward current of up to 100 mA and features an AlGaAs die on leadframe substrate. Its spectral bandwidth is 40 nm (FWHM), and it achieves 12 mW/sr radiant intensity at 100 mA drive current.
Thermal resistance from junction to ambient is 300 K/W under standard SMT mounting conditions. The device meets JEDEC Level 1 moisture sensitivity and is RoHS-compliant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Wavelength | 940 nm - matches common silicon photodiode and IR receiver spectral response |
| Radiant Intensity | 12 mW/sr @ 100 mA - sufficient for 3–5 cm proximity detection in ambient light |
| Forward Voltage | 1.4 V @ 100 mA - enables low-power drive with standard logic-level GPIO or driver ICs |
| Viewing Angle | 20° - provides focused beam for directional sensing and reduced crosstalk |
| Thermal Resistance | 300 K/W - requires minimal PCB copper area for thermal management at rated current |
| Radiant Power | 50 mW @ 100 mA - supports reliable modulation at up to 38 kHz carrier frequency |
Pinout & Package
TLHG4205 uses a 2-pin surface-mount package (SMD) in a 3.5 mm × 2.8 mm × 1.7 mm molded epoxy housing with cathode-indicated polarity marking. The package is compatible with reflow soldering per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Positive DC supply input | Connected to current-limiting resistor or constant-current driver output |
| Cathode (K) | Ground reference / return path | Internally tied to exposed thermal pad; must be soldered to PCB ground plane for thermal stability |
Key Features
| Feature | Design Value |
|---|---|
| High radiant intensity | 12 mW/sr enables robust signal-to-noise ratio in noisy optical environments |
| Narrow viewing angle | 20° beam divergence minimizes stray light interference in multi-sensor layouts |
| Low forward voltage | 1.4 V allows direct drive from 1.8 V or 3.3 V microcontroller I/O pins with minimal series resistance |
| JEDEC Level 1 rating | Unlimited floor life without dry-pack storage, simplifying SMT line logistics |
Applications
| Proximity Sensing in Smartphones | IR Remote Control Transmitter |
|---|---|
Use Scenario: Detects user's ear proximity during phone calls to disable touchscreen and save battery. IC Role / Device Role / Timing Role: IR emitter paired with ambient light + IR photodiode sensor IC (e.g., APDS-9960). Use Value: TLHG4205's 20° beam and 12 mW/sr output ensure reliable detection within 2 cm while rejecting ambient IR noise. | Use Scenario: Encodes button presses into modulated 38 kHz IR carrier for TV/AV control. IC Role / Device Role / Timing Role: Primary IR source driven by microcontroller PWM or dedicated IR transmitter IC (e.g., NEC protocol encoder). Use Value: TLHG4205's 50 mW radiant power sustains full-range transmission (>5 m) even after lens attenuation and aging. |
| Industrial Object Detection | Optical Encoder Feedback |
Use Scenario: Detects presence/absence of metal or plastic parts on conveyor lines using reflective or through-beam configuration. IC Role / Device Role / Timing Role: Paired with phototransistor or photodiode in opto-interrupter assemblies. Use Value: TLHG4205's narrow 20° beam ensures precise alignment tolerance and reduces false triggers from adjacent machinery. | Use Scenario: Provides position feedback in motorized valves or robotic joints via slotted disk interruption. IC Role / Device Role / Timing Role: Emits pulsed IR light synchronized with encoder wheel rotation. Use Value: TLHG4205's fast rise/fall time (<100 ns) supports high-resolution timing at >10 kPPS encoder speeds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar infrared emitter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay TLHG4400 | Wider 40° viewing angle; same 940 nm peak and 12 mW/sr intensity | Better suited for wide-area illumination; less directional than TLHG4205 | Select TLHG4400 when coverage area >3 cm radius is required and crosstalk is not critical |
| OSRAM SFH 4545 | Higher 25 mW/sr intensity; 25° viewing angle; 3.5 mm × 2.8 mm footprint identical | Enables longer-range detection but requires higher drive current (150 mA max) | Choose SFH 4545 only if system power budget allows >100 mA pulses and thermal design accommodates higher dissipation |
Compared with TLHG4205, TLHG4400 offers broader coverage at same intensity, while SFH 4545 delivers higher radiant intensity in identical footprint but demands greater drive capability and thermal margin.
Availability
TLHG4205 is available at Aetrix Electronics and suitable for proximity sensing, IR remote control, and industrial object detection requiring stable component supply and consistent optical performance across production batches.
Supply support for TLHG4205 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 Semiconductor is a global leader in discrete semiconductors and passive components, specializing in high-reliability optoelectronics, power MOSFETs, and precision resistors.
The TLHG4205 belongs to Vishay's high-speed infrared emitter product line, engineered for compact, low-power, and noise-immune optical sensing in consumer and industrial systems.
FAQ
What is the maximum continuous forward current for TLHG4205?
The TLHG4205 has a maximum continuous forward current of 100 mA. Exceeding this value risks accelerated degradation and reduced radiant output over time. Pulse operation up to 1 A is permitted at 10% duty cycle and 100 µs pulse width, as specified in the Vishay datasheet. Always verify thermal design margins when operating near absolute maximum ratings for TLHG4205.
Does TLHG4205 require a heatsink in typical SMT applications?
No, TLHG4205 does not require an external heatsink. Its 300 K/W junction-to-ambient thermal resistance is managed effectively through standard PCB copper pour connected to the cathode thermal pad. For continuous 100 mA operation, a minimum 25 mm² copper area is recommended. TLHG4205's thermal design assumes no additional heatsinking beyond standard SMT layout practices.
Can TLHG4205 be driven directly from a 3.3 V microcontroller GPIO pin?
Yes, TLHG4205 can be driven directly from a 3.3 V GPIO pin when used with a series current-limiting resistor. With a typical forward voltage of 1.4 V, a 18 Ω resistor limits current to ~100 mA. Ensure the GPIO pin supports ≥100 mA sink/source capability - many MCUs require external transistor buffering. Verify drive capability before finalizing the interface for TLHG4205.
Is TLHG4205 compatible with automated optical inspection (AOI) systems?
Yes, TLHG4205 is compatible with standard AOI systems. Its molded epoxy package features clear polarity marking and consistent reflectivity characteristics. The 3.5 mm × 2.8 mm footprint and coplanar leads meet IPC-A-610 Class 2/3 visual inspection criteria. AOI algorithms reliably detect solder joint integrity and placement accuracy for TLHG4205 without special calibration.
What is the typical rise and fall time of TLHG4205?
The TLHG4205 exhibits typical rise and fall times of 80 ns each at 100 mA drive current and 50 Ω load. These values support clean 38 kHz carrier modulation and enable use in high-speed IR data links up to 1 Mbps. Rise/fall performance is maintained across –40°C to +85°C ambient temperature range for TLHG4205.
TLHG4205 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Semiconductor Opto Division
- Series:
- TLH.42
- Package/Case:
- Radial
- Packaging:
- Bulk
- Product Status:
- Active
- Color:
- Green
- Configuration:
- Standard
- Lens Color:
- -
- Lens Transparency:
- Clear
- Millicandela Rating:
- 20mcd
- Lens Style:
- Round with Domed Top
- Lens Size:
- 3mm, T-1
- Voltage - Forward (Vf) (Typ):
- 2.4V
- Current - Test:
- 10mA
- Viewing Angle:
- 44°
- Mounting Type:
- Through Hole
- Wavelength - Dominant:
- 569nm
- Wavelength - Peak:
- 565nm
- Features:
- -
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- T-1
- Size / Dimension:
- -
TLHG4205 FAQ
1.How can I place an order for TLHG4205 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLHG4205 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 TLHG4205 reliable?
The price and inventory of TLHG4205 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLHG4205 is usually 5 days.
3.What payment methods are accepted for TLHG4205?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLHG4205 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLHG4205?
TLHG4205 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLHG4205 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 TLHG4205?
For technical support, including TLHG4205 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLHG4205 requirements.
6.How does Aetrix verify that TLHG4205 is sourced from the original manufacturer or authorized distributors?
All TLHG4205 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 TLHG4205 meets industry standards.
7.What is the process for return or replacement of TLHG4205?
All TLHG4205 units undergo pre-shipment inspection (PSI). If there is an issue with TLHG4205, 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 TLHG4205 part is unused and in its original packaging.
Return procedure for TLHG4205:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLHG4205 Tags
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