Key takeaways
- Mouser announced availability of the ams OSRAM SFH 4256B and SFH 4244B SIDELED infrared emitters on August 27, 2026.
- The side-emitting SMT devices use an integrated reflector and offer 860 nm and 950 nm peak-wavelength options, respectively.
- Both parts are specified for operation from -40°C to 110°C; procurement teams should still verify bin, package quantity, lead time and regional stock before approving a build.
- The wavelength choice, optical layout and thermal conditions should be evaluated at the system level with the intended sensor, camera or photodetector.
Mouser announces distributor availability
Mouser Electronics has announced availability of ams OSRAM’s SIDELED SFH 4256B and SFH 4244B infrared emitters. The distributor dated the announcement August 27, 2026, and lists the devices for applications including access control and security, factory automation, home and building automation, display management, position and angle sensing, and eye, face and hand tracking.
The news is principally a channel-availability update rather than evidence that the emitters were first introduced on that date. Mouser’s dedicated product page for the pair was originally published on June 11, 2026 and updated August 27. For buyers, the material point is that the two parts are now being promoted through Mouser’s catalog with product documentation and part-number ordering paths.
Two wavelength options in the same package approach
The SFH 4256B is the shorter-wavelength option, specified by ams OSRAM with an 860 nm peak wavelength; it is described in product naming and application material as an 850 nm-class infrared emitter. The SFH 4244B is the longer-wavelength alternative, specified at a 950 nm peak wavelength and described as a 940 nm-class emitter. Those nominal wavelength families matter because detector response, camera filtering, ambient-light behavior and visible red glow are system-level considerations.
Both devices are side-emitting surface-mount LEDs with an integrated reflector. ams OSRAM lists a 4.0 mm by 4.0 mm footprint and 3.6 mm height for each part. Mouser specifies a 60-degree half angle, equivalent to a 120-degree full beam angle, along with 12 ns typical rise and fall times under the stated 70 mA test condition and 50-ohm load.
Electrical and environmental details to check
Mouser lists a maximum continuous forward current of 100 mA and a 0.7 A pulsed-forward-current rating when pulses are no longer than 30 microseconds and duty cycle does not exceed 0.005. Its product listing also identifies a -40°C to 110°C operating range, 2 kV human-body-model ESD performance under ANSI/ESDA/JEDEC JS-001, and AEC-Q102 qualification.
The distributor lists typical radiant intensity values of 25 mW/sr for the SFH 4256B and 22 mW/sr for the SFH 4244B. ams OSRAM’s individual product pages list typical intensity at a 70 mA test current as 17 mW/sr and 16 mW/sr, respectively, alongside order-code-specific intensity ranges. Teams should use the latest manufacturer datasheet and the selected bin or ordering code when setting optical budgets rather than relying on a single catalog summary value.
Where the parts may fit
A side-emitting geometry can be useful where the emitter must direct light parallel to the printed-circuit board or couple into a mechanical optical path without standing a conventional through-hole LED off the board. Potential designs include short-range optical signaling, reflective sensing, occupancy or position sensing, and compact IR illumination arrangements. Neither part alone constitutes a complete camera illuminator, reader or access-control subsystem.
For security and access-control equipment, wavelength selection should start with the receiver or imager. An 860 nm source may align with systems designed around high near-IR camera sensitivity, while a 950 nm source can be considered where designers seek lower visible red glow. Actual results depend on lensing, diffuser material, drive conditions, camera exposure settings, sensor spectral response and the installation environment.
Procurement and integration considerations
The manufacturer lists both parts as full-production products on its English-language pages, with ordering codes Q65115A2647 for the SFH 4256B and Q65115A2646 for the SFH 4244B. Engineers replacing older emitters should not assume direct drop-in equivalence simply because wavelength and package family appear similar. Radiation pattern, intensity bin, solder profile, current limits, thermal path and optical alignment all warrant review.
For installers and OEM supply teams, an approval package should include the current ams OSRAM datasheet, Mouser availability and packaging details, and a sample-board optical test using the final enclosure. In security-related use, validation should also cover performance under daylight, reflective surfaces and the specific camera or photodetector filters deployed in the finished system.