The HIS100SMD-S operates as a pulsable thermal infrared emitter. A 1 × 1 mm micro-fabricated heating element — constructed from a high-melting-point metal with a patented nanostructured high-emissivity surface — is electrically heated to approximately 600 °C at maximum drive power (290 mW). At this temperature, it emits broadband infrared radiation closely approximating a near black-body spectrum, which is transmitted through the integrated Si-ARC optical window.

Silicon (Si) with anti-reflection coating (ARC) is selected for its excellent mid-infrared transmission from approximately 2.5 µm to 14 µm — a range that spans both the near-infrared gas absorption region and the thermally important 8–14 µm atmospheric window. The anti-reflection coating minimises Fresnel reflection losses at the silicon-air interface, ensuring that the maximum fraction of the emitter’s infrared output is transmitted to the detector. This is particularly significant at the HIS100SMD-S’s higher optical output levels, where minimising window losses delivers a measurable increase in detector signal.

The 1 mm² radiating element produces three times the total radiant flux of the 0.32 mm² HIS20SMD variants. Combined with the broad Si-ARC window, this results in up to 26 mW of useful optical power across the 2–14 µm band — twice the output of the HIS20SMD-S (13 mW). This elevated flux enables system designers to use longer absorption path lengths in multi-reflection gas cells, support simultaneous multi-channel detector configurations, or maintain robust measurement performance in optically attenuating environments such as high-particulate industrial atmospheres or contaminated sampling systems.

Modulated operation is supported up to 10 Hz (50% modulation depth, square wave, 50% duty cycle), enabling lock-in detection for improved signal-to-noise performance. The 10 Hz modulation limit reflects the larger thermal mass of the 1 mm² element compared to the 0.32 mm² element of the HIS20SMD-S, which supports modulation up to 14 Hz.

Highest Optical Output of Any Windowed HISsmd Emitter in the Extended Mid-IR — Up to 26 mW

The HIS100SMD-S delivers up to 26 mW of optical output within the 2–14 µm Si-ARC window — double the output of the HIS20SMD-S (13 mW) and exceeding the HIS100SMD-A (22 mW) across a far broader spectral range. It is the most powerful windowed emitter in the entire HISsmd series for applications requiring coverage beyond 6 µm, and the highest-output option for multi-gas detection systems targeting ammonia, ozone, sulphur dioxide, and VOCs alongside the standard near-IR gas species.

Large 1 mm² Radiating Element — 3× the Area of HIS20SMD Variants

The 1 × 1 mm element provides proportionally greater total radiant flux and larger optical etendue than the 0.32 mm² elements of the HIS20SMD series. This supports effective illumination of large detector apertures, long and multipass gas cells, beam-split multi-detector arrays, and optical systems with inherently large acceptance angles — key requirements in advanced environmental monitoring instruments, industrial process analysers, and high-performance research spectrometers.

Si-ARC Window — Broadest Spectral Coverage of Any Windowed HISsmd Emitter

The silicon anti-reflection coated window provides the widest transmission range of any windowed variant in the HISsmd series: 2–14 µm. This encompasses the complete near-infrared gas absorption region (CO₂, CO, CH₄, N₂O, hydrocarbons) as well as the longer-wave mid-infrared molecular fingerprint region where ammonia (10.3 µm), ozone (9.6 µm), SO₂ (7.3 µm), and a broad range of complex organics and VOCs absorb. The anti-reflection coating minimises surface reflection losses, maximising transmitted optical power to the detector.

Gold-Plated Package for Reliable High-Current Operation

The gold-plated SMD package provides stable, oxidation-resistant electrical contacts rated for continuous operation at up to 170 mA. This ensures consistent drive conditions and long-term measurement stability in instruments deployed in humid, corrosive, or industrially demanding environments.

Near Black-Body Emission with Emissivity > 0.9

The patented nanostructured emitter surface achieves emissivity exceeding 0.9, delivering well-characterised, reproducible infrared output that closely approximates an ideal thermal radiator across the full 2–14 µm Si-ARC window. This is essential for quantitative gas measurement systems requiring accurate, drift-free source characterisation over extended deployment periods.

Pulsable Operation — Modulation up to 10 Hz

Support for modulated output enables synchronous lock-in detection for improved signal-to-noise performance. The 10 Hz modulation frequency is fully adequate for all standard NDIR gas sensing, environmental monitoring, and analytical instrument designs. For applications requiring faster modulation (up to 14 Hz), the HIS20SMD-S is the appropriate lower-power alternative.

JEDEC-Compliant Mechanical and Thermal Reliability

Compliance with three JEDEC reliability standards — temperature cycling, vibration, and drop testing — confirms the HIS100SMD-S’s suitability for demanding long-term deployment in industrial, environmental, and commercial monitoring applications across India.

DCB.S3.290 Driver Board and BOB 0.4 Breakout Board Support

The dedicated DCB.S3.290 Driver Circuit Board (LT3065 LDO regulator, 2.0–13 V input, 290 mW drive power) enables rapid system evaluation and prototyping. The BOB 0.4 Breakout Board adapts the SMD footprint to 2.54 mm headers for bench development. Both are available through United Spectrum Instruments.

Production-Ready 3 × 3 mm SMD Footprint

The standard SMD package is compatible with automated pick-and-place assembly and reflow soldering, enabling high-volume manufacturing adoption by Indian OEM electronics manufacturers producing gas detection instruments, environmental monitors, and industrial sensing systems.

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Environmental Monitoring

Used in NDIR gas sensors to measure atmospheric gases such as CO₂, methane, and hydrocarbons.

Industrial Gas Detection

Integrated into gas monitoring systems used in chemical plants, refineries, and manufacturing facilities.

Smart Buildings and HVAC Systems

Used in indoor air quality monitoring systems for intelligent building management and HVAC control.

Medical and Healthcare Diagnostics

Supports respiratory gas analysis systems and breath alcohol detection devices.

Consumer Electronics and IoT

Enables infrared sensing in portable analyzers, smart home devices, and wearable environmental sensors.

Scientific Research and Spectroscopy

Used in infrared spectroscopy instruments, laboratory analyzers, and portable spectrometers.

United Spectrum Instruments is a specialised photonics and sensing technology company serving India’s research, industrial, and manufacturing sectors. As the sole authorised Indian distributor for the full INFRASOLID HISsmd product range, the team provides genuine components backed by manufacturer-certified expertise and dedicated local support.

• Official authorisation: Verified product authenticity with full manufacturer traceability and warranty coverage across the entire INFRASOLID range
• Technical consultation: Expert guidance on Si-ARC window optics, high-power IR system design, multi-gas sensor architecture, detector and bandpass filter selection, modulation optimisation, and PCB thermal management for 290 mW operation
• Complete HISsmd series availability: All six variants — HIS100SMD-S, HIS100SMD-A, HIS100SMD-0, HIS20SMD-S, HIS20SMD-A, HIS20SMD-0 — plus DCB.S3.290, DCB.S3.175, and BOB 0.4 accessories, from a single local source
• Application engineering: End-to-end support for multi-gas NDIR sensor development, environmental analyser integration, industrial safety system design, and research instrumentation prototyping
• Fast domestic supply: Pan-India logistics with reduced procurement lead times and complete import documentation and GST compliance handling
• Institutional procurement support: Purchase order processing, GST-compliant invoicing, and documentation for IITs, NITs, CSIR, DRDO, ISRO, government departments, public sector undertakings, and corporate procurement teams
• Nationwide coverage: Bengaluru, Hyderabad, Delhi NCR, Mumbai, Chennai, Pune, Ahmedabad, Kolkata, and all major technology and industrial centres across India