onsemi HLMPM201

Overview

HLMPM201 from Fairchild Semiconductor is a 4 mm flat-top red LED lamp with wide 135° viewing angle, 5.4 mcd minimum luminous intensity at 20 mA, 2.2 V typical forward voltage, and peak wavelength of 635 nm - designed for front-panel status indication and compact backlighting in industrial HMI and instrumentation.

For engineers reviewing the HLMPM201 datasheet, pinout, applications, or equivalent options, key selection factors include its diffused or clear tinted package option, 30 mA continuous forward current rating, -55°C to +100°C operating temperature range, and compatibility with standard 260°C lead soldering (5 sec max).

Technical Context

The HLMPM201 is a through-hole, two-lead GaAsP-based red LED optimized for high-brightness visible indication. Its flat-top cylindrical package enables uniform light distribution and mechanical stability in panel-mount applications, while the cathode-indicated pinout ensures correct polarity during manual or automated assembly.

Electrical behavior follows standard diode characteristics: forward voltage is specified at 20 mA (max 3.0 V), reverse voltage rating is 5 V, and luminous intensity is measured under controlled IF = 20 mA conditions with photometric calibration traceable to industry standards.

Key Specifications

Pinout & Package

HLMPM201 uses a standard 2-lead through-hole package with 2.54 mm (0.100") lead spacing. The cathode is marked by a flat edge on the package body and indicated by a notch in the lead frame diagram.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar red LED indicator applications.

Compared with L-7113ID and TLHR5400, HLMPM201 offers the widest viewing angle (135°) in a compact 4 mm form factor, making it optimal for applications where broad-angle visibility and space-constrained mounting are both critical design requirements.

Availability

HLMPM201 is available at Aetrix Electronics and suitable for industrial HMI, instrumentation backlighting, medical device UI, and transportation control panels requiring stable component supply and long-term manufacturing continuity.

Supply support for HLMPM201 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 HLMP-M200/M201 series belongs to Fairchild's legacy 4 mm flat-top LED lamp family, engineered specifically for high-brightness, wide-angle visual indication in space-constrained industrial and instrumentation applications.

FAQ

What is the maximum continuous forward current for HLMPM201?

The HLMPM201 has a maximum continuous forward current rating of 30 mA at TA = 25°C. This value decreases with rising ambient temperature per the current derating curve in the datasheet. Exceeding 30 mA continuously risks accelerated lumen depreciation and reduced lifetime. Always use a series current-limiting resistor calculated for the applied supply voltage and desired operating current - for example, a 150 Ω resistor with 5 V supply yields ~20 mA drive for HLMPM201.

Does HLMPM201 have a diffused or clear lens option?

Yes, HLMPM201 is available in both tinted diffused and tinted clear package variants. The diffused version provides uniform light distribution with no central hotspot, ideal for status indicators where soft, even illumination is preferred. The clear version delivers higher directional intensity and sharper beam definition, suited for applications requiring focused brightness. Both share identical electrical specifications and mechanical dimensions - only optical output profile differs.

What is the peak wavelength and viewing angle of HLMPM201?

The HLMPM201 has a peak wavelength of 635 nm - producing a saturated red output perceptible across daylight and low-light conditions. Its viewing angle is 135° full width at half maximum (FWHM), measured at IF = 20 mA. This wide angular distribution ensures consistent brightness over a broad operator field of view, eliminating the need for secondary optics in most panel-mount applications.

Can HLMPM201 be used in automotive interior applications?

HLMPM201 meets industrial temperature and reliability requirements (-55°C to +100°C operating range, solid-state construction), but it is not AEC-Q200 qualified or automotive-grade rated. It may be used in non-safety-critical automotive interior applications such as aftermarket infotainment UIs or service tools, provided system-level validation confirms performance under vibration, thermal cycling, and ESD conditions. For OEM automotive designs, AEC-Q200-compliant alternatives are recommended.

What is the reverse voltage rating for HLMPM201?

The HLMPM201 has a maximum reverse voltage rating of 5 V, tested at IR = 100 µA. Applying more than 5 V in reverse bias risks permanent junction damage. In practice, this means HLMPM201 must not be subjected to reverse polarity during handling, testing, or circuit operation - always verify correct anode/cathode orientation before soldering. Use of a series protection diode is unnecessary in properly designed unidirectional LED driver circuits.