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Vishay Semiconductor Opto Division TLLG4400
- Part No.:
- TLLG4400
- Manufacturer:
- Vishay Semiconductor Opto Division
- Category:
- LED Indication - Discrete
- Package:
- Radial
- Datasheet:
-
TLLG4400.pdf
- Description:
- LED GREEN DIFFUSED T-1 T/H
- Quantity:
- Payment:
- Shipping:
Inventory:1,885
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Product details
Overview
TLLG4400 from Vishay Semiconductors is a low-current green LED in a 3 mm tinted diffused package, delivering 0.63–1.2 mcd luminous intensity at 2 mA forward current, with dominant wavelength 562–575 nm and forward voltage 1.9–2.4 V. It serves as an indicator or status light in space-constrained, ultra-low-power DC circuits.
For engineers reviewing the TLLG4400 datasheet, TLLG4400 pinout, TLLG4400 application, or TLLG4400 equivalent, this page provides verified optical, electrical, thermal, and packaging data - including absolute maximum ratings, luminous intensity classification, and tape orientation (AS12) - to support selection for battery-powered instrumentation, industrial control panels, and legacy embedded UIs.
Technical Context
The TLLG4400 uses GaP-on-GaP semiconductor technology optimized for visible green emission. Its ±25° viewing angle and diffused lens ensure uniform illumination across front-panel indicators without requiring secondary optics.
Rated for operation from –40 °C to +100 °C ambient, it features 800 K/W junction-to-ambient thermal resistance and supports pulsed drive up to 150 mA (10 μs), enabling compatibility with microcontroller GPIOs and CMOS logic-level outputs without external current limiting in low-duty-cycle applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Luminous intensity | 0.63–1.2 mcd at 2 mA - sufficient for clear visibility in dimly lit enclosures without excessive power draw |
| Dominant wavelength | 562–575 nm - standardized green output compliant with IEC 62471 photobiological safety requirements |
| Forward voltage | 1.9–2.4 V at 2 mA - compatible with 3.3 V and 5 V logic rails using simple series resistor biasing |
| Absolute max forward current | 7 mA DC - defines safe continuous drive level for long-life operation in always-on status indicators |
| Viewing angle | ±25° - provides focused beam for directional indication while maintaining readability at moderate off-axis angles |
| Junction temperature limit | 100 °C - sets thermal derating boundary for PCB layout in sealed or high-ambient environments |
| Reverse voltage rating | 6 V - allows safe reverse polarity tolerance in unregulated or manually wired installations |
Pinout & Package
Package: Ø3 mm radial-leaded, tinted diffused epoxy lens with cathode-indicating flat side. Lead pitch: 2.54 mm. Tape orientation: AS12 (cathode leads tape first).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (longer lead) | Positive terminal | Connects to current source or MCU GPIO configured as push-pull high; requires series resistor for current limiting |
| Cathode (shorter lead / flat side) | Negative terminal | Reference node for current return; identifies polarity during manual placement and automated tape feeding (AS12) |
Key Features
| Feature | Design Value |
|---|---|
| Low power consumption | Operates at 2 mA typical - extends battery life in portable devices and reduces heat generation on dense PCBs |
| CMOS/MOS compatible | Forward voltage ≤ 2.4 V at rated current - ensures reliable turn-on with 3.3 V logic outputs without level shifting |
| Luminous intensity categorization | K-group (0.63–1.25 mcd) - enables consistent brightness matching within production lots for uniform panel appearance |
| Tinted diffused package | Non-glare, wide-angle emission - eliminates hot spots and improves readability under variable lighting conditions |
| Specified at IF = 2 mA | Test condition aligned with common microcontroller GPIO sink capability - simplifies design validation and BOM rationalization |
Applications
| Industrial Control Panel Indicator | Portable Medical Device Status Light |
|---|---|
Use Scenario: Front-panel power-on or fault indication on DIN-rail mounted PLC I/O modules operating in ambient temperatures up to 70 °C. IC Role / Device Role / Timing Role: Visual status emitter - no timing function; driven statically by isolated 3.3 V supply via 1.5 kΩ series resistor. Use Value: 0.63–1.2 mcd output ensures legibility at 1 m distance under factory lighting; ±25° viewing angle covers operator's normal line of sight without overspill. |
Use Scenario: Low-battery warning LED on handheld glucose meter powered by single CR2032 coin cell (nominal 3 V, <10 mA peak). IC Role / Device Role / Timing Role: Power-efficient visual alert - pulsed at 2 Hz using MCU GPIO to extend battery runtime beyond 12 months. Use Value: 2 mA drive current minimizes load on aging battery; 1.9–2.4 V VF range avoids dropout issues as cell voltage declines to 2.7 V. |
| Legacy Instrumentation Display | Automotive Aftermarket Diagnostic Tool |
Use Scenario: Replacement indicator for analog multimeter or oscilloscope front panel where original incandescent lamp failed due to filament breakage. IC Role / Device Role / Timing Role: Direct drop-in replacement for 3 mm lamp socket - same mechanical footprint and low-voltage DC interface. Use Value: 3 mm diameter and radial leads match legacy mounting holes; tinted diffused lens replicates soft glow of incandescent bulb without glare. |
Use Scenario: CAN bus activity indicator on OBD-II scan tool housing exposed to automotive cabin temperatures ranging from –40 °C to +85 °C. IC Role / Device Role / Timing Role: Real-time communication status marker - toggled synchronously with TX/RX frames using open-drain driver. Use Value: –40 to +100 °C operating range ensures reliability across full vehicle thermal envelope; 6 V reverse voltage withstand prevents damage during jump-start transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED indicator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLLG4401 | Higher luminous intensity: 1–2 mcd at 2 mA (L-group vs. K-group) | Better suited for applications requiring higher visibility in bright ambient light | Select TLLG4401 when panel readability under direct sunlight or high-lux industrial lighting is critical |
| TLLE4400 | Same green color and 3 mm package but with water-clear lens (not tinted diffused); 565–575 nm dominant wavelength | Produces sharper, more directional beam; less diffusion than TLLG4400 | Choose TLLE4400 only if optical control demands tighter beam pattern and higher peak intensity at center axis |
Compared with TLLG4400, TLLG4401 offers higher brightness for demanding visibility needs without changing PCB layout or drive circuitry, while TLLE4400 trades diffusion for directionality - making it unsuitable as a direct visual substitute where soft, uniform illumination is required.
Availability
TLLG4400 is available at Aetrix Electronics and suitable for industrial control panels, portable medical devices, legacy instrumentation displays, and automotive aftermarket diagnostic tools requiring stable component supply and long-term obsolescence management.
Supply support for TLLG4400 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 Intertechnology is a global manufacturer of discrete semiconductors and passive components, founded in 1962 and headquartered in Malvern, Pennsylvania.
The TLLG4400 belongs to Vishay's low-current LED product line, engineered specifically for ultra-low-power, long-life visual indication in space- and energy-constrained applications where reliability and consistency outweigh raw brightness.
FAQ
What is the luminous intensity range of the TLLG4400 at its rated test current?
The TLLG4400 delivers a luminous intensity of 0.63–1.2 mcd when tested at 2 mA forward current per Vishay's datasheet revision 2.6. This K-group classification ensures consistent brightness within production lots and supports uniform visual appearance across multi-LED panels. The value reflects measurement at 25 ms pulse width and is validated across the full operating temperature range.
Does the TLLG4400 have a built-in current-limiting resistor?
No, the TLLG4400 is a bare LED die in a 3 mm package and does not include an integrated current-limiting resistor. External series resistance must be used to limit forward current to ≤7 mA DC or ≤150 mA pulsed (10 μs). For standard 2 mA operation from a 3.3 V supply, a 680 Ω resistor is typical; from 5 V, a 1.5 kΩ resistor is recommended. Always verify power dissipation in the resistor under worst-case voltage and temperature conditions.
What does the "AS12" suffix in TLLG4400-AS12 indicate?
The "AS12" suffix specifies tape orientation for automated pick-and-place: cathode lead exits the reel first. This matches the physical marking on the LED body (flat side adjacent to cathode) and ensures correct polarity placement during SMT assembly. AS12 is distinct from AS21 (anode-first) and MS12 (wider tape option); using the wrong orientation risks reversed LEDs on the board unless corrected in firmware or post-process inspection.
Can the TLLG4400 be used in outdoor applications?
The TLLG4400 is not rated for direct outdoor exposure due to its non-hermetic epoxy package and lack of IP-rated encapsulation. While its –40 to +100 °C operating range supports wide ambient conditions, UV degradation, moisture ingress, and thermal cycling may reduce luminous output over time. For outdoor use, it must be housed behind UV-stable polycarbonate lenses and sealed within an IP65-rated enclosure - and brightness should be validated after 5,000 hours of accelerated life testing under combined thermal/humidity stress.
Is the TLLG4400 suitable for new designs given the "Not for new designs" note in the datasheet?
Yes - the "Not for new designs" note applies only to the TLLY4400-MS12, TLLY4401-AS12, and TLLY4401-MS12 variants (yellow LEDs), not to the TLLG4400. Vishay's documentation explicitly lists TLLG4400 and TLLG4400-AS12 in active production tables with no obsolescence flags. The TLLG4400 remains a viable, supported option for new low-power green indicator designs requiring 3 mm form factor and K-group brightness.
TLLG4400 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Semiconductor Opto Division
- Series:
- -
- Package/Case:
- Radial
- Packaging:
- Bulk
- Product Status:
- Active
- Color:
- Green
- Configuration:
- Standard
- Lens Color:
- -
- Lens Transparency:
- Diffused
- Millicandela Rating:
- 1.2mcd
- Lens Style:
- Round with Domed Top
- Lens Size:
- 3mm, T-1
- Voltage - Forward (Vf) (Typ):
- 1.9V
- Current - Test:
- 2mA
- Viewing Angle:
- 50°
- Mounting Type:
- Through Hole
- Wavelength - Dominant:
- 569nm
- Wavelength - Peak:
- 565nm
- Features:
- -
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- T-1
- Size / Dimension:
- -
TLLG4400 FAQ
1.How can I place an order for TLLG4400 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLLG4400 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 TLLG4400 reliable?
The price and inventory of TLLG4400 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLLG4400 is usually 5 days.
3.What payment methods are accepted for TLLG4400?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLLG4400 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLLG4400?
TLLG4400 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLLG4400 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 TLLG4400?
For technical support, including TLLG4400 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLLG4400 requirements.
6.How does Aetrix verify that TLLG4400 is sourced from the original manufacturer or authorized distributors?
All TLLG4400 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 TLLG4400 meets industry standards.
7.What is the process for return or replacement of TLLG4400?
All TLLG4400 units undergo pre-shipment inspection (PSI). If there is an issue with TLLG4400, 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 TLLG4400 part is unused and in its original packaging.
Return procedure for TLLG4400:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLLG4400 Tags
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