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onsemi MR3051
- Part No.:
- MR3051
- Manufacturer:
- onsemi
- Category:
- LED Indication - Discrete
- Package:
- Radial
- Datasheet:
-
MR3051.pdf
- Description:
- LED RED DIFFUSED T-1 3/4 T/H
- Quantity:
- Payment:
- Shipping:
Inventory:3,819
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Product details
Overview
MR3051 from Fairchild Semiconductor is a red T-1 3/4 (5 mm) integrated LED lamp with built-in current-limiting resistor, rated for 12 V DC operation, delivering 1.0–2.0 mcd luminous intensity at 13 mA forward current, with 660 nm peak wavelength and 60° viewing angle - used for status indication in industrial control panels and power supply front-ends.
For engineers reviewing the MR3051 datasheet, pinout, applications, or equivalent options, this page provides verified package dimensions, absolute maximum ratings, optical-electrical characteristics, thermal limits, and direct alternative options for 12 V indicator lamp replacement.
Technical Context
The MR3051 integrates a series resistor within a molded epoxy T-1 3/4 package to enable direct 12 V operation without external current limiting. It uses GaAsP semiconductor material and features a tinted, diffused lens for color identification and wide-angle visibility.
Rated for continuous operation from –40°C to +100°C ambient, the device exhibits stable forward voltage (VF ≈ 1.8 V typical at 13 mA), 24 nm spectral line half-width, and 5.0 V reverse breakdown voltage - all specified at TA = 25°C per DS300020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Luminous Intensity | 1.0–2.0 mcd at VF = 12 V; sufficient for clear visual status indication at 1–2 m distance under ambient lighting |
| Forward Current | 13 mA typical at VF = 12 V; fixed by internal resistor, eliminating need for external current-setting components |
| Peak Wavelength | 660 nm; standard deep-red emission compatible with human eye sensitivity and optical filters |
| Viewing Angle | 60° full width; enables uniform visibility across panel-mounted applications without secondary optics |
| Operating Temp | –40°C to +100°C; supports deployment in industrial enclosures and unregulated ambient environments |
| Reverse Breakdown | 5.0 V at IR = 100 µA; defines maximum allowable reverse bias before junction degradation |
| Lead Soldering | 5 sec at 260°C; compatible with standard surface-mount reflow and hand-soldering processes |
Pinout & Package
T-1 3/4 (5 mm) radial-leaded package with cathode (shorter lead) and anode (longer lead); leads spaced 2.54 mm (0.100") center-to-center; epoxy lens tinted red and diffused.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (+) | Positive DC supply connection | Longer lead; connects to 12 V rail through current-limiting resistor internal to package |
| Cathode (–) | Ground or return path | Shorter lead; completes circuit; polarity must be observed to avoid reverse breakdown |
Key Features
| Feature | Design Value |
|---|---|
| Integrated current-limiting resistor | Enables direct 12 V connection without external components, reducing BOM count and PCB footprint |
| Tinted and diffused epoxy lens | Provides consistent red color identification and 60° viewing angle without secondary optics or masking |
| GaAsP semiconductor material | Delivers stable 660 nm red emission with 24 nm spectral width for reliable photodetector compatibility |
| Radial T-1 3/4 package | Standard 5 mm through-hole form factor with 2.54 mm lead pitch, compatible with legacy panel-mount tooling |
Applications
| Industrial Control Panel Indicator | Power Supply Status Light |
|---|---|
Use Scenario: Mounted on DIN-rail mounted PLC I/O modules to indicate output activation state. IC Role / Device Role / Timing Role: Visual status emitter - no timing or logic function; driven directly from 12 V logic-level output. Use Value: 13 mA drive current and 2.0 mcd intensity ensure legibility at 1.5 m in factory lighting; integrated resistor prevents overcurrent during hot-plug events. | Use Scenario: Front-panel LED on AC/DC power supplies to signal "ON" or fault condition. IC Role / Device Role / Timing Role: Steady-state DC indicator - operates continuously or latched via control logic. Use Value: –40°C to +100°C rating ensures reliability inside thermally stressed enclosures; 60° viewing angle covers operator's field of view without reflectors. |
| Test Equipment Power-On Light | Automated Machinery Run/Stop Indicator |
Use Scenario: Illuminated power switch on benchtop multimeters and oscilloscopes. IC Role / Device Role / Timing Role: Directly connected to regulated 12 V rail; no PWM or modulation required. Use Value: 5.0 V reverse breakdown tolerance protects against accidental reverse polarity during service; diffused lens eliminates glare under close inspection. | Use Scenario: Safety-critical RUN/STOP status on CNC machine control cabinets. IC Role / Device Role / Timing Role: Fail-safe visual feedback tied to interlocked control outputs. Use Value: Solid-state reliability and –40°C start-up capability support 24/7 operation in unheated factory floors; red wavelength avoids confusion with green "OK" indicators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar indicator lamp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay TLHR5400 | Same T-1 3/4 package, 635 nm peak, 15 mA typical IF, no integrated resistor - requires external 560 Ω for 12 V | Higher luminous intensity (5 mcd), narrower spectral width (15 nm), but needs external resistor and layout space | Select when higher brightness or tighter wavelength control is needed and board space allows external component |
| Lite-On LTST-C191KFKT | Surface-mount 0805 package, 630 nm, 100 mcd @ 20 mA, no integrated resistor | Not pin-compatible; requires SMT assembly and driver design; unsuitable for through-hole panel mounting | Select only for new SMT designs where miniaturization outweighs ease of panel integration |
Compared with TLHR5400 and LTST-C191KFKT, the MR3051 uniquely combines 12 V direct-drive capability, through-hole T-1 3/4 mechanical fit, and industrial temperature range - making it optimal for retrofitting or legacy panel builds where resistor omission and mechanical compatibility are primary constraints.
Availability
MR3051 is available at Aetrix Electronics and suitable for industrial control panels, power supply status indicators, test equipment front-panels, and automated machinery run/stop displays requiring stable component supply and long-term obsolescence management.
Supply support for MR3051 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
Fairchild Semiconductor was a U.S.-based analog and discrete semiconductor manufacturer, acquired by ON Semiconductor in 2016; known for high-reliability optoelectronics and power devices.
The MR3051 belongs to Fairchild's Integrated T-1 3/4 Resistor Lamp family, designed specifically for simplified 5 V and 12 V panel-mount visual indication without external current-setting components.
FAQ
What is the forward voltage of the MR3051 at 12 V operation?
The MR3051 does not operate *at* 12 V across the LED junction - its internal resistor drops excess voltage. At 12 V applied, the forward voltage (VF) across the LED die is approximately 1.8 V (typical), with the remainder dropped across the integrated resistor to maintain ~13 mA forward current. This behavior is confirmed in Figure 1 (I-V curve) and Table "Electrical/Optical Characteristics" of DS300020.
Can the MR3051 be used with a 5 V supply?
No - the MR3051 is designated as the 12 V variant in Fairchild's MR3X51 series. Using it with 5 V results in insufficient forward current (~3–4 mA), causing very low or no visible output. The MR3050 is the correct 5 V counterpart. This distinction is explicit in the part numbering (MR3050 vs. MR3051) and electrical tables in DS300020.
Is the MR3051 RoHS compliant?
The MR3051 was manufactured prior to RoHS enforcement (DS300020 dated 2001) and contains leaded solder and Pb-containing glass/epoxy materials. It is not RoHS compliant. For RoHS-compliant alternatives, consult Aetrix's updated indicator lamp portfolio with documented compliance certificates.
What is the maximum reverse voltage the MR3051 can withstand?
The MR3051 has a reverse breakdown voltage of 5.0 V minimum at IR = 100 µA, as specified in the Absolute Maximum Ratings table of DS300020. Exceeding this risks permanent junction damage; design must ensure reverse polarity protection if system wiring is non-polarized.
Does the MR3051 require a heatsink?
No - the MR3051 dissipates less than 150 mW (12 V × 13 mA) and is rated for operation up to +100°C ambient without heatsinking. Its epoxy package and low thermal mass allow direct mounting on panels or PCBs with no additional thermal management required under normal operating conditions.
MR3051 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- Radial
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Color:
- Red
- Configuration:
- Standard
- Lens Color:
- Red
- Lens Transparency:
- Diffused
- Millicandela Rating:
- 2mcd
- Lens Style:
- Round with Domed Top
- Lens Size:
- 5mm, T-1 3/4
- Voltage - Forward (Vf) (Typ):
- 12V
- Current - Test:
- 13mA
- Viewing Angle:
- 60°
- Mounting Type:
- Through Hole
- Wavelength - Dominant:
- -
- Wavelength - Peak:
- 660nm
- Features:
- -
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- T-1 3/4
- Size / Dimension:
- -
MR3051 FAQ
1.How can I place an order for MR3051 through Aetrix?
Please submit a Request for Quotation (RFQ) for MR3051 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 MR3051 reliable?
The price and inventory of MR3051 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MR3051 is usually 5 days.
3.What payment methods are accepted for MR3051?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MR3051 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MR3051?
MR3051 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MR3051 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 MR3051?
For technical support, including MR3051 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MR3051 requirements.
6.How does Aetrix verify that MR3051 is sourced from the original manufacturer or authorized distributors?
All MR3051 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 MR3051 meets industry standards.
7.What is the process for return or replacement of MR3051?
All MR3051 units undergo pre-shipment inspection (PSI). If there is an issue with MR3051, 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 MR3051 part is unused and in its original packaging.
Return procedure for MR3051:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MR3051 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
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