Specifications
| Type | Description |
|---|---|
| Part Number | EL_IR91-21C |
| Manufacturer | EVERLIGHT |
| Product Type | SMD LED |
| Category | LED |
| Package Case | 1.9mm round subminiature axial package; water clear plastic with spherical top view lens |
| Chip Material | GaAlAs |
| Lens Color | Water Clear |
| Package Type | Small double-end package |
| Optical Matching | Spectrally matched with silicon photodiode and phototransistor |
| Continuous Forward Current | 65 mA; Ta=25°C |
| Peak Forward Current | 1.0 A; Ta=25°C |
| Reverse Voltage | 5 V; Ta=25°C |
| Operating Temperature | -25 to +85 °C; absolute maximum rating |
| Storage Temperature | -40 to +85 °C; absolute maximum rating |
| Soldering Temperature | 260 °C; soldering time <= 5 seconds |
| Power Dissipation | 130 mW; at or below 25°C free air temperature |
| Radiant Intensity | Min 3.0 mW/sr, Typ 5.0 mW/sr; IF=20mA, Ta=25°C |
| Peak Wavelength | Typ 940 nm; IF=20mA, Ta=25°C |
| Spectral Bandwidth | Typ 45 nm; IF=20mA, Ta=25°C |
| Forward Voltage | Typ 1.2 V, Max 1.5 V; IF=20mA, Ta=25°C |
| Reverse Current | Max 10 µA; VR=5V, Ta=25°C |
| View Angle | Typ 25 deg; 2θ1/2, IF=20mA, Ta=25°C |
| Reflow Soldering Limit | Not more than two times; soldering condition |
| Hand Soldering Temperature | Less than 350 °C; within 3 seconds once per terminal, soldering iron capacity less than 25 W |
| Packing Quantity | 1000 pcs/bag |
| Datasheet Status | request_only |
Product Overview
The EL_IR91-21C is an EVERLIGHT infrared emitting diode built with GaAlAs chip material. It is supplied in a small double-end, 1.9mm round subminiature axial package using water clear plastic and a spherical top view lens. The device selection guide identifies the lens color as water clear, and the description states spectral matching with silicon photodiodes and phototransistors.
At IF=20 mA and Ta=25°C, the diode provides 3.0 mW/sr minimum and 5.0 mW/sr typical radiant intensity. Its optical output is centered at a typical 940 nm peak wavelength with 45 nm typical spectral bandwidth and a 25 degree typical view angle. Electrical ratings include 1.2 V typical and 1.5 V maximum forward voltage, plus 10 µA maximum reverse current at VR=5 V.
Absolute maximum ratings list 65 mA continuous forward current, 1.0 A peak forward current, 5 V reverse voltage, 130 mW power dissipation, -25 to +85°C operating temperature, and -40 to +85°C storage temperature. Assembly limits include 260°C soldering for up to 5 seconds, reflow not more than two times, and hand soldering below 350°C within 3 seconds once per terminal.
Key Features
- GaAlAs infrared emitting diode chip material
- Water clear lens for infrared optical output
- Small double-end 1.9mm round axial package
- Spherical top view lens in water clear plastic
- Spectrally matched with silicon photodiodes and phototransistors
- 940 nm typical peak wavelength at IF=20 mA
- 25 degree typical view angle at IF=20 mA
- 3.0 mW/sr minimum radiant intensity at IF=20 mA
- 65 mA continuous forward current rating at Ta=25°C
- 260°C soldering limit for up to five seconds
Typical Applications
- Silicon photodiode optical links
- Phototransistor emitter pairing
- Infrared sensing assemblies
- 940 nm IR emitter circuits
- Narrow-angle optical detection
- Subminiature axial package designs
Procurement Notes
When requesting a quote for EL_IR91-21C, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For LED and optoelectronic sourcing, brightness bin, wavelength or color temperature bin, forward voltage range, viewing angle, moisture sensitivity level and soldering process limits may affect final selection, availability and lead time.
FAQ
What type of device is the EL_IR91-21C?
The EL_IR91-21C is an EVERLIGHT infrared emitting diode in the LED category. The extracted datasheet facts identify a GaAlAs chip, water clear lens, and 1.9mm round subminiature axial package.
What optical wavelength does EL_IR91-21C use?
At IF=20 mA and Ta=25°C, the EL_IR91-21C has a typical peak wavelength of 940 nm. The same condition lists a typical spectral bandwidth of 45 nm and typical view angle of 25 degrees.
Which detector types are matched with this emitter?
The datasheet description states that the EL_IR91-21C is spectrally matched with silicon photodiodes and phototransistors. That makes the stated optical pairing based on the extracted manufacturer facts.
What soldering limits apply to EL_IR91-21C?
The absolute maximum soldering temperature is 260°C for a soldering time of 5 seconds or less. Reflow soldering is limited to not more than two times, and hand soldering must be less than 350°C within 3 seconds once per terminal.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: June 30, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.