TS942ID - Dual Micropower Op Amp | STMicroelectronics
部品番号: TS942ID ✓ 生産中TS942ID 概要
An operational amplifier, or op amp, is a high-gain differential amplifier used to amplify, buffer, filter, or compare small voltage signals. In the signal-chain hierarchy, the TS942ID belongs to the operational-amplifier family within analog amplifier ICs and power-management systems. Its micropower operating current and rail-to-rail output behavior make it suitable for portable instrumentation, sensor interfaces, and low-voltage analog equipment.
The TS942ID provides a supply-current consumption of 1.2 uA and an ultra-low input bias current of 1 pA. These characteristics reduce loading on high-impedance sensors and conserve energy in battery-operated systems. Its output swing is rail-to-rail, while single-supply operation extends to 10 V. The device also includes CMOS inputs, 2 kV ESD protection, and latch-up immunity for improved handling robustness.
With a gain-bandwidth product of 10 kHz and a slew rate of 0.0045 V/us, the TS942ID favors precision and low-power operation over wideband performance. The 10 kHz bandwidth is suitable for slow sensor signals, ECG-scale physiological waveforms, precision current measurement, and low-frequency filtering. CMOS input stages support very low bias current, making the amplifier appropriate for high-source-impedance transducers where input loading must remain minimal.
Typical uses include portable biomedical instrumentation, low-power sensor conditioning, battery-powered data acquisition, industrial process monitoring, and general-purpose buffering. Two independent channels can process complementary signals or provide simultaneous amplification. Because each channel can also be configured as a comparator-style element with suitable feedback, designers can use the same device for basic threshold and level-detection functions.
The principal design consideration is bandwidth. The 10 kHz gain-bandwidth product limits high-gain signal bandwidth, so applications requiring faster edges or wider closed-loop bandwidth should account for the amplifier's finite slew rate. Input and output stability must also be evaluated with the source impedance, load capacitance, supply voltage, and selected feedback network.
ドロップイン代替品: TS942ID — 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。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: TS942ID （同一形状・フットプリント） — 相違点: Number of Pins, Package.
TS942AID
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
TS942CD
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
TS944ID
✅ ドロップイン ⚠️ 仕様未検証価格はお問い合わせください
データシートを見る →TS944AID
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
TS944CD
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
TS942ID 最大定格＆電気的特性
| Number of Amplifier Channels | 2 channels |
| Gain-Bandwidth Product | 10 kHz |
| Slew Rate | 0.0045 V/us |
| Supply Voltage Range | 2.5 V to 10 V |
| Single-Supply Operation | Up to 10 V |
| Supply Current Consumption | 1.2 uA |
| Input Bias Current | 1 pA |
| Output Swing | Rail-to-rail |
| Input Type | CMOS input |
| ESD Protection | 2 kV |
| Latch-Up Protection | Latch-up immunity |
| ピン数 | 8 pins |
| パッケージ | 8-SOIC |
| 実装タイプ | Surface mount |
| RoHS Compliance | unknown |
| REACH Compliance | unknown |
TS942ID ピン構成
| ピン 1 | OUTA — Amplifier A output |
| ピン 2 | INTA- — Inverting input for amplifier A |
| ピン 3 | INTA+ — Non-inverting input for amplifier A |
| ピン 4 | V- — Negative supply connection |
| ピン 5 | INTB+ — Non-inverting input for amplifier B |
| ピン 6 | INTB- — Inverting input for amplifier B |
| ピン 7 | OUTB — Amplifier B output |
| ピン 8 | V+ — Positive supply connection |
主な用途
TS942ID の用途: 6 件s: Portable Biometric Sensor Conditioning, Battery-Powered Sensor Interfaces, Low-Power Industrial Process Monitoring, Portable Data Acquisition, Precision Threshold Detection, Low-Power Audio and Communication Buffing.
Portable Biometric Sensor Conditioning
The TS942ID is appropriate for low-power biometric and physiological sensor front ends because its 1 pA input bias current minimizes loading on high-impedance sensing elements. Two channels can amplify or buffer related signals while the 1.2 uA supply-current consumption limits battery demand. The 10 kHz gain-bandwidth product suits slow sensor outputs rather than high-frequency waveform reconstruction. Designers should evaluate input-referred noise, offset, common-mode range, and electrode-site isolation before using it in a medical product.
おすすめ
Battery-Powered Sensor Interfaces
The TS942ID fits battery-operated sensor interfaces because its 1.2 uA supply-current consumption and 1 pA input bias current reduce both source loading and power consumption. Its dual-channel configuration can condition one sensor directly and provide a reference, monitor, or complementary channel in the same 8-pin SOIC. The 2.5 V to 10 V supply range supports low-energy systems, although the 10 kHz bandwidth limits the device to slow-changing or low-frequency sensor signals.
おすすめ
Low-Power Industrial Process Monitoring
The TS942ID can amplify low-level process signals in compact industrial monitoring equipment when slow bandwidth and low supply current are more important than high-speed drive capability. Its 1 pA input bias current is useful with resistive sensors, while the 10 kHz gain-bandwidth product supports slowly varying pressure, temperature, or level signals. Two independent channels can handle a measurement input and a control or alarm signal, but the design must respect the device's input common-mode and output-swing limits.
おすすめ
Portable Data Acquisition
The TS942ID is useful in portable data-acquisition systems that sample slowly varying analog channels from resistive dividers, thermocouples, or other transducers. The dual amplifier can reduce component count by processing two channels in one package, while the 1.2 uA current consumption helps preserve battery life. Its CMOS inputs and 1 pA bias current minimize transducer loading. The 10 kHz gain-bandwidth product and 0.0045 V/us slew rate make the device more appropriate for temperature, pressure, and position channels than for wideband data acquisition.
おすすめ
Precision Threshold Detection
The TS942ID can perform low-power threshold detection by operating each amplifier as a comparator, with the input and feedback network defining the switching point. Its rail-to-rail output behavior is valuable near the supply rails, and the 1.2 uA supply current keeps continuous monitoring economical. The 10 kHz bandwidth is sufficient for slow level changes but not for demanding comparator timing. Input overdrive, output logic levels, and propagation delay should be reviewed before using the amplifier outside its linear operating region.
おすすめ
Low-Power Audio and Communication Buffing
The TS942ID can serve as a low-power buffer or gain stage in portable audio, communications, and control systems when the signal bandwidth remains below the amplifier's 10 kHz capability. Rail-to-rail output operation increases usable signal swing in low-voltage systems, while the 1.2 uA consumption is appropriate for always-on monitoring paths. Its 0.0045 V/us slew rate is modest, so designers should avoid using it for high-frequency audio reconstruction or edge-heavy communications signals without a higher-bandwidth amplifier.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: TS942ID — 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 | TS942AID | TS942CD | TS944ID | TS944AID | TS944CD |
|---|---|---|---|---|---|---|
| Package | SOIC-8 | SOIC-8 | SOIC-8 | SOIC-8 | SOIC-8 | SOIC-8 |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Number of Amplifier Channels | 2 channels | 2 channels | 2 channels | 2 channels | 2 channels | 2 channels |
主な差別化要因
- Dual-channel integration reduces package count （vs TS942AID)
- Very low input loading supports high-impedance sources （vs TS944ID)
- Lower power consumption for continuously active analog paths （vs TS944CD)
設計ノート
The 10 kHz gain-bandwidth product and 0.0045 V/us slew rate make board-level stability and source impedance especially important. Keep the input network short, place the amplifier close to the sensing source, and route the feedback loop away from noisy or high-impedance nodes. For slowly varying sensors, include a small feedback capacitor that creates a stable single-pole response rather than attempting high closed-loop gains without bandwidth margin.
Decouple each supply rail close to pins 8 and 4 with a short, low-inductance connection to the ground plane. A small ceramic capacitor handles high-frequency transients, while an additional bulk capacitor can support longer supply disturbances. Although the device consumes only 1.2 uA, capacitor leakage, leakage through the sensor, and board contamination can dominate the total system current. Select low-leakage components when designing for very long battery life.
Do not assume that rail-to-rail output automatically means the input common-mode range covers both supply rails. Check input offset, common-mode limits, and output load current in the manufacturer datasheet before operating near a rail. Also account for the 0.0045 V/us slew rate: a large output step at high frequency may require several microseconds to settle, which can create sampling errors in a fast acquisition system despite the low power consumption.
コンプライアンス情報
The TS942ID documentation identifies 2 kV ESD protection and latch-up immunity, but no explicit RoHS, REACH, lead-free, halogen-free, or conflict-minerals declaration was identified.
