TS921IN - 4MHz Rail-to-Rail Op Amp | STMicroelectronics
部品番号: TS921IN ✓ 生産中TS921IN 概要
An operational amplifier, or op amp, is a high-gain analog building block used to amplify, buffer, compare, filter, and control signals. The TS921IN belongs to the operational-amplifier hierarchy, which falls under analog amplifier ICs and broader semiconductor signal-conditioning devices. Its rail-to-rail input and output architecture is useful when the usable input or output range must extend close to the supply rails.
Key characteristics include a 4 MHz gain-bandwidth product, 1 V/µs slew rate, low input-referred noise density of 9 nV/√Hz, and typical output current of 80 mA. The single-amplifier configuration allows a PCB footprint to remain compact, while the 8-DIP package provides straightforward through-hole assembly. The listed operating temperature range is -40°C to +125°C, supporting industrial-temperature applications.
The TS921IN combines rail-to-rail signal handling with relatively high bandwidth and output-drive capability. Its low-noise specification is particularly useful for low-level audio, instrumentation, sensor-interface, and general analog signal-conditioning circuits. The 80 mA output current also allows the amplifier to drive more demanding loads than a typical comparator-oriented or ultra-low-power op amp, provided the supply voltage and thermal limits remain satisfied.
Typical uses include low-level sensor amplification, active filtering, audio preamplification, buffer stages, threshold and comparator-style interfaces, and general industrial control circuitry. It can also serve as a rail-to-rail input/output buffer in systems where the input signal approaches either supply rail. Designers should still verify stability, output swing, load capability, and noise performance against the complete circuit requirements.
A key design consideration is the trade-off between bandwidth, noise, and output drive. The TS921IN is more capable than a low-power, low-bandwidth amplifier, but it is not necessarily the optimal choice for every precision or micropower design. Input and output stability should be evaluated with the actual source impedance, load, supply voltage, and external compensation network.
This page combines verified distributor specifications and availability with a practical TS921IN selection guide, application analysis, datasheet references, and defensible family alternatives. Pricing reflects the verified $0.58 unit-price listing as of October 29, 2026, while unavailable technical fields are explicitly marked rather than estimated.
ドロップイン代替品: TS921IN — 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。
TS920IN
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
TS922IN
✅ ドロップイン価格はお問い合わせください
データシートを見る →TS921IN 最大定格＆電気的特性
| Amplifier Type | General-purpose operational amplifier |
| Number of Circuits | 1 circuit |
| Gain-Bandwidth Product | 4 MHz |
| Slew Rate | 1 V/µs |
| Input-Referred Noise Density | 9 nV/√Hz |
| Typical Output Current | 80 mA |
| Input Common-Mode Range | Rail-to-rail |
| Output Swing | Rail-to-rail |
| Maximum Stated Supply Voltage | 12 V |
| 電源電流 | 1 mA |
| 動作温度範囲 | -40°C to +125°C |
| パッケージ | 8-DIP, 7.62 mm pitch |
| 実装タイプ | Through-hole |
| ESD Protection | Internal |
TS921IN 8-dip, 7.62 mm pitch ピン配置ガイド
TS921IN (8-dip, 7.62 mm pitch パッケージ) のピン配置。 このアナログコンポーネントは、入力、出力、および電源ピンを備えています。オフセットナル、補償、イネーブルピンの設定については、メーカーのデータシートを参照してください。信号調整やアンプ回路に最適です。
詳細なピン配置データはありません: TS921IN.
詳細は データシート をご参照ください。
主な用途
TS921IN の用途: 6 件s: Low-Level Sensor Signal Conditioning, Audio Preamplification, Industrial Active Filtering, Rail-to-Rail Buffering, Threshold and Control Interfaces, General Analog Signal Conditioning.
Low-Level Sensor Signal Conditioning
The TS921IN fits low-level sensor conditioning because the manufacturer datasheet information specifies 9 nV/√Hz input-referred noise density, a 4 MHz gain-bandwidth product, and rail-to-rail input operation. It can amplify or buffer outputs from sensors whose signal may approach either supply rail without requiring a separate input-bias arrangement across the full nominal range. The 1 V/µs slew rate supports moderate-frequency sensor signals, while the 80 mA typical output current provides drive beyond a basic low-power amplifier. The designer should still select gain, filtering, and bias resistors according to the sensor impedance, and verify common-mode behavior close to the supply rails.
おすすめ
Audio Preamplification
The TS921IN can serve in an audio preamplifier or line-stage buffer where low input noise and moderate bandwidth are useful. According to the manufacturer datasheet information, its noise density is 9 nV/√Hz and its gain-bandwidth product is 4 MHz, allowing useful bandwidth at modest signal gains. Rail-to-rail input and output operation can simplify interfacing with low-voltage audio circuitry. The 80 mA typical output current is sufficient for many line-level stages, but headphone loads, capacitive loads, distortion limits, and output-current behavior must be checked. Feedback-component selection and the required signal-band bandwidth should follow the manufacturer guidance.
おすすめ
Industrial Active Filtering
The TS921IN is suitable for industrial active-filter stages that need a general-purpose amplifier with moderate speed and rail-to-rail signal handling. Its 4 MHz gain-bandwidth product provides bandwidth for many low- and mid-frequency filter sections, while the 1 V/µs slew rate helps preserve large-signal behavior compared with slower amplifiers. The verified operating-temperature range of -40°C to +125°C supports industrial environments. In practical filters, component tolerances, gain-bandwidth interaction, stability, and noise can determine usable bandwidth. The circuit should therefore be simulated and measured with the actual source and load impedances rather than relying on the 4 MHz gain-bandwidth figure alone.
おすすめ
Rail-to-Rail Buffering
The TS921IN is appropriate for rail-to-rail input and output buffering where a signal must pass through an amplifier with limited headroom. The manufacturer datasheet information confirms both rail-to-rail input and output operation, while the 4 MHz gain-bandwidth product permits useful closed-loop bandwidth at unity gain. Its typical output current of 80 mA gives designers more load margin than a conventional low-current op amp. However, the required output swing, capacitive-load stability, and settling performance must be checked. A unity-gain buffer also places the stability limits of the selected operating region directly on the signal path, so feedback and load validation remain essential.
おすすめ
Threshold and Control Interfaces
The TS921IN can implement threshold detection, comparator-style signal interfaces, and general feedback-control circuits when an open-loop output behavior and controlled saturation are acceptable. Its rail-to-rail input range can reduce signal-chain headroom requirements, while the 1 V/µs slew rate gives a defined transition speed. The 80 mA typical output current may support logic or relay-driver interface stages more effectively than a very-low-current amplifier. Engineers must account for propagation delay, output swing, overdrive recovery, and the distinction between linear operation and comparator use. Pull-up or pull-down components and the downstream device's input thresholds should be evaluated before implementation.
おすすめ
General Analog Signal Conditioning
The TS921IN fits general analog signal-conditioning boards requiring a single, straightforward operational amplifier. According to the manufacturer datasheet information, it combines a 4 MHz gain-bandwidth product, 1 V/µs slew rate, rail-to-rail input and output behavior, and 9 nV/√Hz input noise density. These characteristics make it broadly usable for gain, scaling, offset, and buffering functions. The 8-DIP through-hole package simplifies prototyping and repair, although it occupies more PCB area than a surface-mount equivalent. Before production release, confirm the exact pin map, recommended decoupling, stable operating region, output-load capability, and absolute supply limits in the manufacturer datasheet.
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: TS921IN — 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 | TS920IN | TS922IN |
|---|---|---|---|
| Package | 8-DIP | 8-DIP | 8-DIP |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics |
主な差別化要因
- Verified combination of moderate speed and stronger output drive （vs TS920IN)
- Rail-to-rail input and output in an 8-DIP package （vs TS922IN)
- Low-noise general-purpose amplification （vs TS922IN)
設計ノート
Do not select TS921IN from the abbreviated distributor description alone. Confirm the manufacturer datasheet for the exact TS921IN ordering code, especially the numbered 8-DIP pin map, supply limits, input range, output swing, stability region, and absolute maximum ratings. Rail-to-rail input does not mean every input condition is linear at either rail, and rail-to-rail output wording does not guarantee zero output distortion at the extreme rail.
Place the input, feedback, output, and supply-connection components to minimize parasitic resistance and capacitance around the 8-DIP amplifier. Keep the feedback loop compact, provide local supply bypassing according to the manufacturer guidance, and maintain a low-impedance ground return. Because the verified excerpt does not specify the recommended capacitor values, do not assume a universal input or output capacitance from other TS92x family members.
Validate the chosen closed-loop gain against the 4 MHz gain-bandwidth product and the 1 V/µs slew rate rather than treating either number as guaranteed signal bandwidth. Include the source impedance, load capacitance, feedback-network impedance, and intended output amplitude in the calculation. For a unity-gain buffer, use the manufacturer's recommended operating region and test the final board with the intended load because capacitive loading can materially change stability.
Design the supply around the verified 12 V upper description and confirm the exact operating range from the manufacturer datasheet. The listed supply current is approximately 1 mA, but actual consumption varies with operating conditions. Account for input and output common-mode limits, output-current demand, and the 80 mA typical output-current capability. If the source is a switching rail, evaluate output ripple and supply-noise rejection rather than assuming the 9 nV/√Hz input-noise figure removes all system noise.
コンプライアンス情報
The supplied verified excerpts establish the product category, package, electrical highlights, price reference, and inventory but do not provide verified RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. These fields remain unknown rather than being inferred.
