TS931ID - 100kHz Rail-to-Rail Op Amp | STMicroelectronics
Référence : TS931ID ✓ ActifTS931ID Présentation
An operational amplifier, or op amp, is an analog integrated circuit that provides high open-loop gain and feedback control for amplification, filtering, comparison, buffering, and signal conversion. The TS93x family belongs to the broader operational-amplifier hierarchy, which includes instrumentation, rail-to-rail, micropower, and precision amplifier categories. Rail-to-rail output operation allows the TS931ID to approach its supply-voltage limits at the output, improving dynamic range in low-voltage systems where usable signal headroom is limited.
The TS931ID provides several characteristics suited to compact analog designs. Its 100 kHz gain-bandwidth product supports moderate-frequency amplification and feedback networks, while the approximately 20 µA supply consumption suits battery-operated equipment. The 1 pA typical input bias current minimizes disturbance to high-impedance sources. According to the available STMicroelectronics datasheet material, the device can reach a 2.9 Vpp output swing with a 100 kΩ load when supplied at 3 V.
The TS931ID uses CMOS inputs and includes ESD protection, making it appropriate for low-leakage analog interfaces. Rail-to-rail output swing improves usable signal range near the positive or negative supply rail, but input common-mode behavior, output-current capability, stability, and drive into capacitive loads must still be checked against the complete operating condition. The single-amplifier configuration also reduces board area when one independent analog channel is required rather than a dual or quad device.
Typical uses include low-power sensor conditioning, portable measurement systems, analog buffering, low-current-to-voltage conversion stages, and small-signal control circuits. Its combination of a 2.7 V minimum supply, 20 µA-class consumption, and 100 kHz bandwidth is particularly relevant to battery-powered instrumentation. The 8-pin SOIC package supports conventional surface-mount assembly and is convenient for prototypes, repair, and mixed analog or mixed-signal boards.
Designers should account for output headroom when driving loads, verify stability with the selected feedback network and load capacitance, and route sensitive input traces away from switching nodes. Input and output bypassing must follow the manufacturer recommendations. Because the verified source set does not provide complete offset, slew-rate, common-mode-range, and absolute-maximum-rating tables, those values should be confirmed in the official datasheet before a safety- or precision-critical design is released.
This page consolidates the verified distributor specifications, package information, purchasing reference, family-level alternatives, and practical analog-design guidance. It also distinguishes documented values from parameters that still require direct confirmation from the manufacturer datasheet, helping engineers move from part selection to PCB implementation without presenting unverified figures as facts.
Alternatives de remplacement direct pour TS931ID — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
TS931CD
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
TS931YD
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
TS931IL
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
TS931AID
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
TS931AIL
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
TS931ID Valeurs maximales et caractéristiques électriques
| Amplifier Type | General-purpose operational amplifier |
| Number of Channels | 1 circuit |
| Gain-Bandwidth Product | 100 kHz |
| Minimum Supply Voltage | 2.7 V |
| Maximum Single-Supply Voltage | 10 V |
| Type de sortie | Rail-to-rail output |
| Output Swing at 3 V Supply | 2.9 Vpp with 100 kΩ load |
| Supply Consumption | 20 µA |
| Typical Input Bias Current | 1 pA |
| Input Protection | ESD protection |
| Input Offset Voltage for TS93xB | 2 mV maximum |
| Boîtier | 8-SOIC, 0.154 inch body width, 3.90 mm |
| Type de montage | Surface mount |
Configuration des broches de TS931ID
| Broche 1 | NC — Not connected (per datasheet) |
| Broche 2 | -IN — Inverting input |
| Broche 3 | +IN — Non-inverting input |
| Broche 4 | V- — Negative supply or ground connection |
| Broche 5 | NC — Not connected (per datasheet) |
| Broche 6 | OUT — Amplifier output |
| Broche 7 | V+ — Positive supply connection |
| Broche 8 | NC — Not connected (per datasheet) |
Applications typiques
TS931ID convient pour 6 applications: Portable Sensor Signal Conditioning, Battery-Powered Measurement Front End, Low-Level Analog Buffering, Industrial Threshold Detection, Low-Leakage Current Sensing, Audio and Communication Interface Buffering.
Portable Sensor Signal Conditioning
The TS931ID fits portable sensor interfaces because its 2.7 V minimum supply, approximately 20 µA consumption, and 1 pA typical input bias current limit both system power and input loading. Place the amplifier near the sensor output so the high-impedance signal is amplified before board traces add capacitance or interference. Its 100 kHz gain-bandwidth product supports low-bandwidth pressure, temperature, and chemical sensing rather than high-speed waveform acquisition. Verify the sensor output range against the TS931ID common-mode limits and include input filtering appropriate to the measured signal.
Recommandé
Battery-Powered Measurement Front End
A TS931ID can amplify weak sensor outputs in a battery-powered measurement front end without requiring a 5 V supply. The approximately 20 µA supply consumption is important when the amplifier must share a compact energy budget with sensing and processing circuitry, while the 1 pA typical input bias current helps avoid loading high-impedance sources. Its 100 kHz gain-bandwidth product is appropriate for quasi-static measurements and modest control bandwidth. The design should include supply decoupling, low-leakage PCB surfaces, and an output range that retains margin below the available 3 V rail.
Recommandé
Low-Level Analog Buffering
The TS931ID provides buffering for low-level analog nodes when isolation from a high-impedance source or downstream load is required. Its 1 pA typical input bias current reduces measurement error with sensitive sources, and the rail-to-rail output can improve utilization of a 2.7 V-to-10 V single-supply system. A 100 kHz gain-bandwidth product supports general-purpose buffering but not demanding wideband video or data tasks. Confirm output-drive requirements and stability with the connected load, because these characteristics are not fully available in the verified source set.
Recommandé
Industrial Threshold Detection
The TS931ID can be used in industrial control and monitoring circuits that detect a slowly changing analog threshold. Its 2.7 V minimum operating voltage supports compact 3.3 V control systems, while approximately 20 µA consumption helps control standby demand. The 100 kHz bandwidth is more than sufficient for many temperature, level, and process-variable signals, and the single-amplifier SOIC format reduces board area. A comparator such as the TS556ID may be preferable when the decision must be sharply defined, so the design should select the device according to whether hysteresis or linear amplification is required.
Recommandé
Low-Leakage Current Sensing
The TS931ID's 1 pA typical input bias current makes it relevant to current-sensing and electrometer-style interfaces when the source impedance is high. Its approximately 20 µA supply consumption supports compact instrumentation, and the rail-to-rail output helps maximize measurement range in a 2.7 V minimum-supply design. The 100 kHz gain-bandwidth product is adequate for slow current monitoring rather than fast transient capture. Designers should verify leakage, offset, and input-capacitance contributions because the complete target-specific offset and noise values are not included in the supplied verified data.
Recommandé
Audio and Communication Interface Buffering
The TS931ID can buffer small-signal interface nodes in audio or communication equipment when the required bandwidth remains below its 100 kHz gain-bandwidth product. Rail-to-rail output operation is useful in a compact single-supply system, and the 2.7 V minimum operating voltage allows operation from a 3 V rail. The approximately 20 µA supply consumption favors low-power designs, although the device should not be assumed to meet high-fidelity audio noise requirements without reviewing the complete noise specifications. For demanding audio paths, compare the TS931ID against a characterized low-noise amplifier such as the NE5534DR.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour TS931ID — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | TS931CD | TS931YD | TS931IL | TS931AID | TS931AIL |
|---|---|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| Amplifier Channels | 1 circuit | 1 circuit | 1 circuit | 1 circuit | 1 circuit | 1 circuit |
| Gain-Bandwidth Product | 100 kHz | 100 kHz family rating | 100 kHz family rating | 100 kHz family rating | 100 kHz family rating | 100 kHz family rating |
| Minimum Supply Voltage | 2.7 V | 2.7 V family rating | 2.7 V family rating | 2.7 V family rating | 2.7 V family rating | 2.7 V family rating |
| Maximum Single-Supply Voltage | 10 V | 10 V family rating | 10 V family rating | 10 V family rating | 10 V family rating | 10 V family rating |
| Supply Consumption | 20 µA | 20 µA family rating | 20 µA family rating | 20 µA family rating | 20 µA family rating | 20 µA family rating |
| Typical Input Bias Current | 1 pA | 1 pA family rating | 1 pA family rating | 1 pA family rating | 1 pA family rating | 1 pA family rating |
| Output Configuration | Rail-to-rail output | Rail-to-rail output | Rail-to-rail output | Rail-to-rail output | Rail-to-rail output | Rail-to-rail output |
Principaux différenciateurs
- Combines low-power operation with very low input loading (vs LM324D)
- Single-amplifier 8-SOIC option supports compact boards (vs TS912ID)
- Rail-to-rail output improves use of a 3 V rail (vs TS931CD)
- Lower-offset A-series options available within the same footprint (vs TS931ID)
Notes de conception
Do not assume that a rail-to-rail output can reach either supply rail. The verified TS931ID data shows a 2.9 Vpp swing from a 3 V supply with a 100 kΩ load, leaving approximately 50 mV of total headroom under that specific condition. Heavier loads can change the usable swing. Design the signal path with additional margin, verify the load current and output impedance, and use the official electrical-characteristics table before fixing an exact gain or full-scale range.
The approximately 20 µA supply consumption makes the TS931ID attractive for portable equipment, but the complete power budget must include regulator quiescent current, load current, pull resistors, sensors, and downstream logic. Confirm that the selected regulator can start correctly at a 2.7 V input and that bypass capacitors maintain the required supply voltage during transients. Low-power operation alone does not guarantee low total system consumption if nearby components dominate the quiescent current.
Place the supply bypass capacitors close to pins 4 and 7 and keep the input and output paths short. Sensitive input pins should face away from switching regulators, inductors, and high-current return paths. Because the typical input bias current is 1 pA, board contamination, flux residue, and moisture can become important in very-high-impedance designs; use a clean PCB and suitable guarding or guarding-ring techniques when source impedances are extremely high.
Verify closed-loop stability for the actual feedback network, source impedance, load, and cable capacitance. The verified data establishes a 100 kHz gain-bandwidth product but does not provide the complete slew-rate, output-capacitance, or noise specifications. Add an isolation resistor where needed to reduce capacitive loading, and avoid relying on the nominal bandwidth for a high-Q filter without accounting for gain-bandwidth and component tolerances.
Informations de conformité
The supplied verified data does not provide target-specific RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. These statuses must be confirmed from STMicroelectronics or the authorized distributor documentation.
