My Inquiry
My Account
Vishay Semiconductor Opto Division TLLG4401-AS12
- Part No.:
- TLLG4401-AS12
- Manufacturer:
- Vishay Semiconductor Opto Division
- Category:
- LED Indication - Discrete
- Package:
- Radial
- Datasheet:
-
TLLG4401-AS12.pdf
- Description:
- LED GREEN DIFFUSED T-1 T/H
- Quantity:
- Payment:
- Shipping:
Inventory:9,898
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TLLG4401-AS12 from Vishay Semiconductors is a low-current green LED in a 3 mm tinted diffused package, delivering 1–2 mcd luminous intensity at 2 mA forward current, with dominant wavelength 562–575 nm and ±25° viewing angle-designed for status indication in battery-powered instrumentation and portable control panels.
For engineers reviewing the TLLG4401-AS12 datasheet, TLLG4401-AS12 pinout, TLLG4401-AS12 application, or TLLG4401-AS12 equivalent, this device serves as a standardized visual indicator where low power draw (≤7 mA max), stable optical output across -40°C to +100°C, and GaP-on-GaP chip technology enable reliable operation in space-constrained DC interface circuits.
Technical Context
This green LED uses a GaP-on-GaP semiconductor structure optimized for visible emission at 562–575 nm dominant wavelength, with peak wavelength at 565 nm. It operates at 2 mA nominal forward current and exhibits 1.9–2.4 V forward voltage under that condition.
The device features ±25° half-intensity viewing angle and 800 K/W thermal resistance junction-to-ambient, enabling direct PCB mounting without heatsinking in low-power indicator roles. Its cathode-first tape orientation (AS12) supports automated placement in high-volume assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Luminous intensity | 1–2 mcd at 2 mA - sufficient for clear visibility in ambient-lit industrial panels without excessive current draw |
| Dominant wavelength | 562–575 nm - standard green spectral 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 supply rails using simple series resistor biasing |
| Viewing angle | ±25° - provides focused yet sufficiently wide beam for front-panel status indication at typical operator distances |
| Absolute max forward current | 7 mA - sets safe operating limit for continuous DC drive in battery-backed systems |
| Junction temperature | 100°C max - enables use in sealed enclosures with limited airflow, such as handheld test equipment |
| Reverse voltage | 6 V - protects against accidental reverse polarity during board-level testing or field service |
Pinout & Package
Package: Ø3 mm tinted diffused epoxy lens with radial leads; AS12 tape orientation denotes cathode lead exits tape first. Standard 2-lead through-hole configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (longer lead) | Positive terminal | Connected to current-limiting resistor and supply rail; must be biased ≥1.9 V above cathode for conduction |
| Cathode (shorter lead, flat side) | Negative terminal | Connected to ground or low-side switch; AS12 marking confirms cathode-first feed direction in reel packaging |
Key Features
| Feature | Design Value |
|---|---|
| Low power consumption | Rated at 2 mA typical drive - reduces system standby current and extends battery life in portable devices |
| High brightness per mA | 1–2 mcd @ 2 mA - delivers visible output with minimal drive circuitry, eliminating need for amplification or boost stages |
| CMOS/MOS compatible | No additional level-shifting required - forward voltage range fits within standard logic output swing margins |
| Luminous intensity categorized | L-group binning (1–2 mcd) ensures consistent brightness across production lots for uniform panel appearance |
| Wide operating temperature | -40°C to +100°C ambient range - supports deployment in automotive under-hood modules and industrial PLC front ends |
Applications
| Industrial Control Panel Indicators | Portable Test Equipment Status Lights |
|---|---|
|
Use Scenario: Front-panel power-on, fault, or mode indicators on DIN-rail mounted PLC I/O modules. IC Role / Device Role / Timing Role: Visual status emitter - no timing or signal processing function; driven by open-collector outputs or microcontroller GPIO pins. Use Value: Stable 1–2 mcd output ensures legibility under factory lighting while drawing ≤2 mA, minimizing load on 24 V DC distribution bus. |
Use Scenario: Battery-operated multimeters and oscilloscope probes requiring low-power activity indicators. IC Role / Device Role / Timing Role: Standby/activity LED - activated intermittently or continuously depending on measurement state. Use Value: 2 mA nominal drive enables >1000 hours of operation on a single CR2032 cell, with green wavelength offering high photopic sensitivity. |
| Medical Device Power-On Confirmation | Smart Home Sensor Node Status |
|
Use Scenario: Non-critical status feedback on Class II medical instruments where visual confirmation is required but not life-sustaining. IC Role / Device Role / Timing Role: Passive optical indicator - electrically isolated via current-limiting resistor; no data communication or regulation function. Use Value: 562–575 nm green output meets IEC 62366 usability guidelines for color-coded alerts, with 100°C max junction temperature supporting sterilization-adjacent environments. |
Use Scenario: Zigbee/Z-Wave environmental sensors indicating network association, battery level, or sensor readiness. IC Role / Device Role / Timing Role: Low-duty-cycle blink indicator - pulsed at <1% duty cycle to extend coin-cell lifetime. Use Value: 7 mA absolute max forward current allows robust overdrive margin during brief pulses, while 800 K/W RthJA prevents thermal runaway during intermittent operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED indicator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLLG4401-AS21 | Anode-first tape orientation (AS21 vs. AS12); identical optical/electrical specs | Requires reversal of tape feed direction in pick-and-place machine setup | Select when existing SMT line is configured for anode-leading feed or when mixing with other AS21-coded Vishay LEDs |
| TLLG4401-MS12 | Same electrical/optical specs but MS tape width (25.5 mm vs. AS 17.3 mm); different reel packaging dimensions | Not compatible with standard 16 mm tape-width feeders; requires wider feeder hardware | Choose only if MS-format reels are mandated by internal logistics or legacy procurement policy |
Compared with TLLG4401-AS12, the AS21 variant offers identical performance with reversed lead orientation for feeder compatibility, while the MS12 version maintains full functional equivalence but demands mechanical adaptation of tape-handling equipment-neither is pin-compatible in the IC sense, as both are discrete 2-lead through-hole LEDs.
Availability
TLLG4401-AS12 is available at Aetrix Electronics and suitable for industrial control panels, portable test equipment, medical device interfaces, and smart home sensor nodes requiring stable component supply with consistent luminous intensity binning and tape-based SMT compatibility.
Supply support for TLLG4401-AS12 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 specializing in discrete semiconductors and passive components, with core expertise in optoelectronics, power MOSFETs, and precision resistors.
The TLLG4401-AS12 belongs to Vishay's low-current LED product line, engineered specifically for energy-efficient visual indication in space- and power-constrained applications where reliability across extended temperature ranges is critical.
FAQ
What is the maximum continuous forward current rating for TLLG4401-AS12?
The TLLG4401-AS12 has a maximum DC forward current rating of 7 mA at 25°C ambient, with derating required above 25°C per the thermal resistance of 800 K/W. This limit ensures long-term reliability without exceeding the 100°C junction temperature ceiling. Operating TLLG4401-AS12 at its typical 2 mA drive point provides ample margin for thermal and lifetime stability in most applications.
Does TLLG4401-AS12 require a current-limiting resistor in series with a 3.3 V supply?
Yes, TLLG4401-AS12 requires a series current-limiting resistor when driven from a 3.3 V supply. With a forward voltage of 1.9–2.4 V at 2 mA, a resistor of approximately 450–550 Ω is needed to set nominal current. The exact value depends on desired brightness and supply tolerance; TLLG4401-AS12 cannot be directly connected to 3.3 V without risk of overcurrent.
What does the "AS12" suffix indicate in TLLG4401-AS12?
The "AS12" suffix in TLLG4401-AS12 specifies the tape orientation: cathode lead exits the carrier tape first. This designation ensures correct placement orientation during automated SMT assembly. AS12 is distinct from AS21 (anode-first) and MS12 (wider tape format), and all three share identical optical and electrical characteristics-only packaging differs.
Is TLLG4401-AS12 suitable for outdoor applications exposed to UV or moisture?
TLLG4401-AS12 is not rated for direct outdoor exposure. Its epoxy lens provides basic protection against humidity and handling, but it lacks IP-rated sealing or UV-stabilized encapsulation. For outdoor use, TLLG4401-AS12 must be housed behind UV-resistant glass or integrated into an IP65+ enclosure. Vishay does not specify UV degradation data or ingress protection for this part.
How is luminous intensity binned for TLLG4401-AS12, and what does "L-group" mean?
TLLG4401-AS12 is binned into the L-group for luminous intensity, defined as 1–2 mcd at 2 mA. Vishay ships only one intensity group per bag to ensure visual consistency across assemblies. The L-group reflects tighter brightness control than the base K-group (0.63–1.25 mcd), making TLLG4401-AS12 appropriate for applications where uniform panel appearance is essential.
TLLG4401-AS12 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Semiconductor Opto Division
- Series:
- -
- Package/Case:
- Radial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Color:
- Green
- Configuration:
- Standard
- Lens Color:
- -
- Lens Transparency:
- Diffused
- Millicandela Rating:
- 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 (3mm)
- Size / Dimension:
- -
TLLG4401-AS12 FAQ
1.How can I place an order for TLLG4401-AS12 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLLG4401-AS12 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 TLLG4401-AS12 reliable?
The price and inventory of TLLG4401-AS12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLLG4401-AS12 is usually 5 days.
3.What payment methods are accepted for TLLG4401-AS12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLLG4401-AS12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLLG4401-AS12?
TLLG4401-AS12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLLG4401-AS12 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 TLLG4401-AS12?
For technical support, including TLLG4401-AS12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLLG4401-AS12 requirements.
6.How does Aetrix verify that TLLG4401-AS12 is sourced from the original manufacturer or authorized distributors?
All TLLG4401-AS12 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 TLLG4401-AS12 meets industry standards.
7.What is the process for return or replacement of TLLG4401-AS12?
All TLLG4401-AS12 units undergo pre-shipment inspection (PSI). If there is an issue with TLLG4401-AS12, 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 TLLG4401-AS12 part is unused and in its original packaging.
Return procedure for TLLG4401-AS12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLLG4401-AS12 Tags
-
LTST-C281KRKT
Lite-On Inc.
-
150060GS75000
Würth Elektronik
-
150060VS75000
Würth Elektronik
-
150060AS75000
Würth Elektronik
-
150060YS75000
Würth Elektronik
-
150060SS75000
Würth Elektronik
-
150060BS75000
Würth Elektronik
-
151031VS06000
Würth Elektronik
-
151033RS03000
Würth Elektronik
-
150080BS75000
Würth Elektronik
-
150080GS75000
Würth Elektronik
-
150141GS73100
Würth Elektronik
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
