STC42A - Automotive H2 Thermal Conductivity Sensor | Sensirion
部品番号: STC42A ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
STC42A 概要
A hydrogen sensor is a gas detector that measures the concentration of H2 molecules in the surrounding atmosphere. Hydrogen is odorless, colorless, and highly flammable, making early detection critical in electric vehicle battery packs and hydrogen storage systems. The STC42A belongs to the broader hierarchy of gas sensors within the semiconductor sensor family, positioned alongside humidity, temperature, and particulate-matter sensors from Sensirion's automotive product line.
Key features include the thermal conductivity measurement principle, which provides superior repeatability and long-term stability compared with electrochemical or catalytic bead alternatives. The sensor supports continuous measurement mode at 1 Hz and a low-power mode consuming less than 7 uA at 0.03 Hz sampling, enabling always-on battery monitoring. AEC-Q100 Grade 2 qualification makes it suitable for harsh automotive environments, and autonomous humidity compensation removes the need for external compensation algorithms.
Technically, the STC42A exploits the high thermal conductivity of hydrogen relative to air: a heated sensing element loses heat proportionally to H2 concentration, and the on-chip signal conditioning converts this into a calibrated digital output over I2C. The co-packaged SHT41A-AD1B provides real-time relative humidity and temperature data that the sensor uses internally to correct cross-sensitivities, ensuring accuracy across varying environmental conditions.
Typical applications include lithium-ion battery thermal runaway early detection in electric vehicles, hydrogen leakage monitoring in fuel-cell vehicles and hydrogen infrastructure, and thermal propagation warning systems where early H2 detection precedes smoke or fire.
When integrating the STC42A, place the sensor where hydrogen accumulates first, typically near the top of the battery enclosure, since hydrogen rises rapidly. Ensure the I2C bus uses appropriate pull-up resistors and follow Sensirion's integration guidelines for airflow.
This page synthesizes distributor pricing context, evaluation-kit options, drop-in variant information, and practical design notes not found in the manufacturer datasheet.
ドロップイン代替品: STC42A — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
クイック比較ツール — 並列比較する代替部品を選択:
STC42A-D-R5
✅ ドロップイン📋 参考代替品（カタログ未掲載）
STC42A 最大定格＆電気的特性
| Target Gas | Hydrogen (H2) |
| Measurement Principle | Thermal conductivity |
| インターフェース | I2C |
| Humidity Compensation | Autonomous, via co-packaged SHT41A-AD1B |
| Continuous Measurement Mode | 1 Hz |
| 低消費電力モード電流 | < 7 uA at 0.03 Hz |
| Automotive Qualification | AEC-Q100 Grade 2 |
| Application Environment | Clean air |
| Package Type | QFN |
| Packaging | Tape & Reel |
| Long-Term Stability | Superior long-term stability (per manufacturer) |
STC42A qfn ピン配置ガイド
STC42A (qfn パッケージ) のピン配置。 ピン番号、機能、接続図はメーカーのデータシートで定義されています。正確なフットプリントとはんだ付けのガイドラインについては、データシートを参照してください。
詳細なピン配置データはありません: STC42A.
詳細は データシート をご参照ください。
主な用途
STC42A の用途: 6 件s: EV Battery Thermal Runaway Detection, Hydrogen Leakage Detection, Thermal Propagation Warning Systems, Battery-Powered IoT Hydrogen Monitors, Hydrogen Fuel-Cell Vehicle Safety, Industrial Hydrogen Infrastructure Monitoring.
EV Battery Thermal Runaway Detection
The STC42A is purpose-built for early detection of lithium-ion battery thermal runaway in electric vehicles, where hydrogen is one of the first gases vented during cell venting events. Its thermal conductivity measurement principle provides superior repeatability and long-term stability in the clean-air reference conditions inside a sealed battery pack, and its AEC-Q100 Grade 2 qualification meets automotive environmental requirements. With continuous 1 Hz measurement, the sensor can flag rising H2 concentration before smoke or flame appears, giving battery management systems time to warn occupants or initiate mitigation. The low-power mode below 7 uA at 0.03 Hz allows always-on monitoring when the vehicle is parked, preserving the 12 V battery while maintaining safety coverage. Autonomous humidity compensation via the co-packaged SHT41A-AD1B prevents false alarms across varying pack humidity conditions.
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Hydrogen Leakage Detection
For hydrogen leakage monitoring in fuel-cell vehicles, hydrogen storage compartments, and refueling infrastructure, the STC42A offers a solid-state digital sensing solution with no consumable electrolyte, unlike electrochemical H2 cells which degrade over time. The thermal conductivity principle delivers repeatable H2 readings in clean air, and long-term stability reduces recalibration intervals - an important economic factor for infrastructure deployed in the field. The I2C controller interface allows direct connection to a monitoring MCU, and the sensor outputs hydrogen concentration with autonomous humidity compensation already applied, simplifying alarm-threshold firmware. In low-power mode the sensor draws under 7 uA at 0.03 Hz, enabling battery-powered or energy-harvesting leak detectors, while 1 Hz continuous mode suits applications requiring fast leak response. Placement near the top of enclosures exploits hydrogen's rapid upward diffusion for earliest detection.
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Thermal Propagation Warning Systems
Thermal propagation warning systems monitor whether a single-cell failure is spreading through a battery pack, and the STC42A provides the earliest practical electrical signal: hydrogen venting precedes visible smoke and thermal rise by seconds to minutes. Mounted at the pack's gas-accumulation point, the sensor's 1 Hz continuous mode feeds the battery management controller with hydrogen concentration trend data that can trigger occupant warnings, contactor opening, or extinguishing measures. Its AEC-Q100 Grade 2 qualification covers the temperature and reliability demands of under-hood-adjacent and in-pack mounting, and thermal conductivity sensing is immune to the silicone and electrolyte-vapor poisoning that degrades MOS-type gas sensors in battery environments. The autonomous SHT41A-AD1B-based humidity compensation inside the STC42A prevents humidity-driven baseline shifts from causing false thermal propagation alarms during vehicle lifetime.
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Battery-Powered IoT Hydrogen Monitors
Battery-operated and wireless hydrogen monitors benefit directly from the STC42A's sub-7 uA low-power consumption at 0.03 Hz sampling - several orders of magnitude lower than catalytic Pellistor sensors that require continuous heater power in the hundreds of milliwatts. A coin-cell or small lithium primary cell can power the sensor for years, enabling deployment of distributed hydrogen detectors in storage rooms, charging bays, and forklift fleets without wiring. The I2C interface connects naturally to low-power microcontrollers and wireless MCUs, and the digital output with integrated humidity compensation removes the need for host-side calibration data. When an event is suspected, firmware can switch from 0.03 Hz patrol mode to 1 Hz continuous mode for fast confirmation, balancing energy budget against response time. Tape-and-reel QFN packaging supports automated assembly for volume IoT production.
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Hydrogen Fuel-Cell Vehicle Safety
In hydrogen fuel-cell vehicles, the STC42A monitors the hydrogen supply loop, stack compartment, and passenger cabin vent paths for leakage. Thermal conductivity measurement in clean air provides the repeatability required to distinguish a genuine leak from sensor drift over the vehicle's lifetime, and AEC-Q100 Grade 2 qualification satisfies the automotive quality gate that consumer-grade sensors cannot pass. The digital I2C output integrates directly with the vehicle safety controller, where staged alarm thresholds can trigger stack shutdown or cabin ventilation. Because the sensor autonomously compensates humidity via its co-packaged SHT41A-AD1B, readings remain reliable from cold damp mornings to hot humid operation without software intervention. Low-power mode under 7 uA supports monitoring while the vehicle is off, and continuous 1 Hz mode activates during driving and refueling.
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Industrial Hydrogen Infrastructure Monitoring
Electrolyzer plants, hydrogen storage facilities, and battery test laboratories require dependable hydrogen concentration monitoring for personnel and asset safety. The STC42A provides repeatable H2 readings in clean-air environments with the long-term stability inherent to thermal conductivity sensing, reducing maintenance compared with electrochemical sensors that need periodic replacement. Its I2C interface eases integration into monitoring gateways and PLC front-ends, and the autonomous humidity compensation from the integrated SHT41A-AD1B keeps readings consistent across seasonal humidity swings in semi-enclosed facilities. Engineers can evaluate the sensor quickly with the SEK-STC42A-SENSOR kit, which includes the SHT41A RH/T sensor and a connection cable to Sensirion's SEK-SensorBridge (ordered separately) for PC-based data logging. The QFN tape-and-reel format supports high-volume deployment across many monitoring points.
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おすすめ製品の概要
エンジニアリング参考データ: STC42A — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | STC42A-D-R5 |
|---|---|---|
| Package | QFN | QFN - same |
| Brand | Sensirion | Sensirion |
| Target Gas | Hydrogen (H2) | Hydrogen (H2) |
| Measurement Principle | Thermal conductivity | Thermal conductivity |
| Interface | I2C | I2C |
| Automotive Qualification | AEC-Q100 Grade 2 | AEC-Q100 Grade 2 |
| Low-Power Mode Current | < 7 uA at 0.03 Hz | < 7 uA at 0.03 Hz |
| Humidity Compensation | Autonomous via SHT41A-AD1B | Autonomous via SHT41A-AD1B |
| Packaging | Tape & Reel | Tape & Reel |
主な差別化要因
- Automotive AEC-Q100 Grade 2 qualification （vs STC31)
- Autonomous humidity compensation on-die （vs STC31)
- Ultra-low standby power （vs Electrochemical H2 sensors)
設計ノート
Mount the STC42A where vented hydrogen accumulates first - typically near the top of the battery enclosure or hydrogen compartment, since hydrogen diffuses rapidly upward. Per Sensirion's integration guidelines in the STC42A datasheet and the SEK-STC42A QuickStart, avoid locating the sensor directly in exhaust airflow or condensation paths, and ensure the QFN land pattern follows the recommended PCB footprint so the sensing cavity communicates with ambient air. Keep high-current battery bus traces away from the sensor to minimize thermal gradients that could affect the thermal conductivity measurement.
Exploit the two operating modes: continuous measurement at 1 Hz for active driving or alarm conditions, and low-power mode below 7 uA at 0.03 Hz for parked-vehicle or standby monitoring. A duty-cycled firmware strategy that switches modes over I2C based on event flags can extend battery backup runtime by orders of magnitude. Verify the host MCU can wake on the sensor's measurement interval and that I2C pull-up resistor current (typically 100 uA range) is accounted for in the total standby budget - pull-ups can dominate the sensor's sub-7 uA consumption if sized too small.
The STC42A is specified for hydrogen measurement in clean air; gases with thermal conductivity close to hydrogen or high background contaminant levels can bias readings, so validate the sensing environment during system qualification. Do not rely on external humidity correction - the co-packaged SHT41A-AD1B performs compensation autonomously, and adding host-side correction can double-compensate. Finally, when evaluating with the SEK-STC42A-SENSOR kit, remember the SEK-SensorBridge must be ordered separately; the kit includes the SHT41A RH/T sensor and connection cable but not the bridge.
コンプライアンス情報
AEC-Q100 Grade 2 automotive qualification confirmed per Sensirion product page and QuickStart documentation. RoHS/REACH/lead-free status not stated in the verified web data.
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