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Vishay Semiconductor Opto Division TLDR4400
- Part No.:
- TLDR4400
- Manufacturer:
- Vishay Semiconductor Opto Division
- Category:
- LED Indication - Discrete
- Package:
- Radial
- Datasheet:
-
TLDR4400.pdf
- Description:
- LED RED DIFFUSED T-1 T/H
- Quantity:
- Payment:
- Shipping:
Inventory:337
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Product details
Overview
TLDR4400 from Vishay Semiconductors is a deep red high-intensity LED using GaAlAs on GaAs double heterojunction technology, housed in a 3 mm tinted diffused (T-1) package with ±40° viewing angle, 648 nm dominant wavelength, and 45 mcd typical luminous intensity at 20 mA - deployed in telecommunication indicators and battery-powered equipment.
For engineers reviewing the TLDR4400 datasheet, TLDR4400 pinout, TLDR4400 application, or TLDR4400 equivalent, key selection criteria include forward voltage (1.8–2.2 V), luminous intensity binning (Group T: 25–50 mcd), thermal resistance (400 K/W), and compatibility with low-current drive (2 mA @ 1 mA) in space-constrained indicator designs.
Technical Context
The TLDR4400 employs a GaAlAs/GaAs double heterojunction structure enabling high radiative efficiency and stable deep red emission at 648 nm dominant wavelength. Its low forward voltage (≤2.2 V at 20 mA) and high luminous intensity (45 mcd typ.) support energy-efficient operation in portable and battery-powered systems.
Thermal resistance junction-to-ambient is 400 K/W, limiting continuous DC current to 50 mA at ≤60 °C ambient. The device features a wide viewing angle (±40°), spectral line half-width of 20 nm, and junction capacitance of 30 pF - characteristics optimized for visual indication rather than high-speed signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Luminous intensity | 45 mcd typical at 20 mA - sufficient for clear visibility under indoor/bright ambient lighting |
| Dominant wavelength | 648 nm - deep red output compliant with visual signaling standards |
| Forward voltage | 1.8–2.2 V at 20 mA - enables direct interface with 3.3 V or 5 V logic without excessive series resistance |
| Viewing angle | ±40° - provides uniform illumination across wide display areas without secondary optics |
| Junction-to-ambient thermal resistance | 400 K/W - constrains max continuous power dissipation to 100 mW at Tamb ≤ 60 °C |
| Reverse voltage rating | 6 V - defines maximum allowable reverse bias before leakage exceeds 10 μA |
| Spectral line half-width | 20 nm - ensures color purity suitable for coded status indication |
Pinout & Package
TLDR4400 is a two-terminal through-hole LED in a standard 3 mm (T-1) tinted diffused package per drawing 6.544-5264.01-4. Cathode indicated by flat side on lens housing and shorter lead.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive terminal | Connects to current-limiting resistor and supply rail; polarity must be observed to avoid damage |
| Cathode | Negative terminal | Identified by flat lens edge and shorter lead; ties to ground or driver sink node |
Key Features
| Feature | Design Value |
|---|---|
| Deep red emission | 648 nm dominant wavelength ensures high human eye sensitivity and compatibility with red-filtered sensors |
| Low forward voltage | 1.8–2.2 V at 20 mA reduces power loss in battery-operated devices and eases drive circuit design |
| Wide viewing angle | ±40° angular distribution eliminates need for external diffusers in panel-mount indicators |
| Luminous intensity binning | Group T (25–50 mcd) enables consistent brightness matching across production batches |
| High material efficiency | GaAlAs/GaAs DH structure delivers 45 mcd at only 20 mA - extends battery life in portable applications |
Applications
| Telecommunication Indicators | Battery-Powered Equipment |
|---|---|
Use Scenario: Status LEDs on VoIP phones, DSL modems, and fiber ONTs requiring visible, non-distracting red indication under varying ambient light. IC Role / Device Role / Timing Role: Visual status emitter driven directly by microcontroller GPIO or discrete transistor switch. Use Value: 45 mcd output and ±40° viewing angle ensure legibility at multiple viewing angles without optical enhancement. | Use Scenario: Power-on and fault indicators in handheld test meters, medical glucose monitors, and portable barcode scanners. IC Role / Device Role / Timing Role: Low-power visual feedback element operating from coin-cell or Li-ion sources. Use Value: 2 mA luminous intensity at 1 mA drive enables ultra-low-power wake-up indication with minimal battery drain. |
| Indoor/Outdoor Information Displays | General-Purpose Panel Indicators |
Use Scenario: Dot-matrix or segmented displays in kiosks, vending machines, and building automation panels exposed to mixed lighting. IC Role / Device Role / Timing Role: Discrete red pixel element in multiplexed LED arrays. Use Value: Stable 648 nm output maintains color consistency across temperature (-40 to +100 °C operating range). | Use Scenario: Front-panel status lights on industrial controllers, lab instruments, and consumer audio gear. IC Role / Device Role / Timing Role: Through-hole mounted visual annunciator with mechanical robustness and solder-reflow compatibility. Use Value: 3 mm T-1 package fits standard 2.54 mm pitch mounting holes and withstands reflow up to 260 °C for 5 s. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED indicator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLHR4400 | Same package and optical specs, but high-red (635 nm) instead of deep red (648 nm); 55 mcd typ. at 20 mA | Better perceived brightness in daylight; less optimal for red-filtered sensing | Select TLHR4400 when higher luminous efficacy or daylight visibility is prioritized over spectral match |
| TLDR6400 | Same deep red (648 nm) and package, but higher intensity bin (Group V: 63–125 mcd); VF identical | Requires tighter current control to avoid oversaturation in low-light environments | Select TLDR6400 when greater margin for aging or optical attenuation is needed in long-life installations |
Compared with TLDR4400, TLHR4400 offers higher apparent brightness but shifts hue toward orange-red, while TLDR6400 retains identical spectral and electrical behavior but doubles luminous output - making TLDR4400 the balanced choice for cost-sensitive, general-purpose red indication where moderate intensity suffices.
Availability
TLDR4400 is available at Aetrix Electronics and suitable for telecommunication indicators, battery-powered equipment, and indoor/outdoor information displays requiring stable component supply and consistent luminous intensity binning.
Supply support for TLDR4400 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 manufacturer of discrete semiconductors and passive components, specializing in high-reliability optoelectronics, power MOSFETs, and precision resistors.
The TLDR4400 belongs to Vishay's standard 3 mm LED product series, engineered for cost-effective, high-volume visual indication in industrial, telecom, and portable applications where consistent color, wide viewing angle, and low-voltage drive are essential.
FAQ
What is the luminous intensity range for TLDR4400 at 20 mA drive current?
The TLDR4400 has a minimum luminous intensity of 25 mcd and a typical value of 45 mcd at 20 mA, with no maximum specified. It is binned into Group T (25–50 mcd), ensuring shipped units fall within that range - critical for consistent brightness matching in multi-LED assemblies.
Does TLDR4400 support pulsed operation, and what are the limits?
Yes, TLDR4400 supports pulsed operation with a surge forward current rating of 1 A for pulse widths ≤10 μs. For longer pulses, derating applies: Fig. 2 shows safe operating area up to 100 ms at 100 mA, and duty cycle must be limited to maintain average power ≤100 mW.
What is the correct polarity identification for TLDR4400 leads?
The TLDR4400 cathode is identified by both a flat edge on the lens housing and a shorter lead length. The anode is the longer lead and corresponds to the rounded side of the lens - incorrect polarity will prevent emission and may accelerate degradation under reverse bias beyond 6 V.
Is TLDR4400 RoHS-compliant and halogen-free?
Yes, TLDR4400 complies with RoHS Directive 2011/65/EU and is halogen-free per Vishay's material categorization standard (document 99912). Full compliance documentation, including substance declarations and test reports, is available upon request from Aetrix Electronics.
What is the maximum ambient temperature for continuous DC operation of TLDR4400?
The TLDR4400 supports continuous DC operation up to +60 °C ambient temperature at its rated 50 mA forward current. Above 60 °C, current must be linearly derated to maintain junction temperature ≤100 °C - for example, to 30 mA at +85 °C ambient.
TLDR4400 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Semiconductor Opto Division
- Series:
- -
- Package/Case:
- Radial
- Packaging:
- Bulk
- Product Status:
- Active
- Color:
- Red
- Configuration:
- Standard
- Lens Color:
- -
- Lens Transparency:
- Diffused
- Millicandela Rating:
- 45mcd
- Lens Style:
- Round with Domed Top
- Lens Size:
- 3mm, T-1
- Voltage - Forward (Vf) (Typ):
- 1.8V
- Current - Test:
- 20mA
- Viewing Angle:
- 80°
- Mounting Type:
- Through Hole
- Wavelength - Dominant:
- 648nm
- Wavelength - Peak:
- 650nm
- Features:
- -
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- T-1
- Size / Dimension:
- -
TLDR4400 FAQ
1.How can I place an order for TLDR4400 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLDR4400 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 TLDR4400 reliable?
The price and inventory of TLDR4400 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLDR4400 is usually 5 days.
3.What payment methods are accepted for TLDR4400?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLDR4400 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLDR4400?
TLDR4400 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLDR4400 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 TLDR4400?
For technical support, including TLDR4400 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLDR4400 requirements.
6.How does Aetrix verify that TLDR4400 is sourced from the original manufacturer or authorized distributors?
All TLDR4400 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 TLDR4400 meets industry standards.
7.What is the process for return or replacement of TLDR4400?
All TLDR4400 units undergo pre-shipment inspection (PSI). If there is an issue with TLDR4400, 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 TLDR4400 part is unused and in its original packaging.
Return procedure for TLDR4400:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLDR4400 Tags
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LTST-C281KRKT
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150060GS75000
Würth Elektronik
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150060VS75000
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150060AS75000
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150060YS75000
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150060SS75000
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150060BS75000
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151031VS06000
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151033RS03000
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150080BS75000
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150080GS75000
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150141GS73100
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