OPA4140AID - Quad 11MHz 36V JFET Op Amp | Texas Instruments
Référence : OPA4140AID ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $7.07 | $7,07 |
| 10 | $6.36 | $63,60 |
| 100 | $5.66 | $566,00 |
| 500 | $5.09 | $2 545,00 |
| 1 000 | $4.53 | $4 530,00 |
OPA4140AID Présentation
A JFET input operational amplifier is a precision analog building block that uses a junction field-effect transistor at its input stage instead of a bipolar transistor. This architecture delivers very low input bias current (picoampere range) and high input impedance, which is critical when amplifying signals from high-impedance sensors, photodiodes, or transducer bridges without loading the source. The OPAx140 family (single, dual, quad) extends this JFET topology into a low-power, low-noise, rail-to-rail-output design suited for modern single-supply precision instrumentation.
Key differentiating features include 5.1 nV/√Hz voltage noise density, 11 MHz gain-bandwidth product, 20 V/µs slew rate, ±18 V (36 V) supply operation, true rail-to-rail output swing, low 1.8 mA per-channel quiescent current, and excellent DC precision with 5 µV typical offset voltage. The JFET input stage eliminates the high input bias currents seen in bipolar amplifiers, making the OPA4140 ideal for high-impedance sensor signal chains.
Technically, the OPA4140 uses TI's proprietary JFET-input dielectrically-isolated process combined with a precision laser-trimmed input stage. The architecture provides unity-gain stability, integrated EMI/RFI rejection filtering, and shutdown-free always-on operation. Each channel draws a low 1.8 mA quiescent current, enabling multi-channel precision designs without thermal concerns in compact 14-SOIC layouts.
Typical applications include precision instrumentation amplifiers, multi-channel data acquisition systems, medical and analytical instrumentation, high-impedance transducer front-ends, professional audio line drivers, active filters, and precision ATE reference buffers. The four channels in one package support dense PCB layouts for multi-sensor or multi-axis measurement systems.
When designing with this device, route input traces as guarded differential pairs and use a solid ground plane to preserve the JFET input's high-impedance advantage. Add 100 nF ceramic bypass capacitors close to each supply pin to maintain PSRR and prevent oscillation under capacitive loads above 1 nF.
This page synthesizes distributor pricing, drop-in quad-channel alternatives, and practical design notes for the OPA4140AID that are not collated in the manufacturer datasheet alone.
Alternatives de remplacement direct pour OPA4140AID — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
OPA4140AIDR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
OPA4141AID
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
OPA4140AIDG4
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
OPA4140AIDE4
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
OPA4244EA/250
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
OPA4140AID Valeurs maximales et caractéristiques électriques
| Number of Channels | 4 (quad) |
| Amplifier Type | JFET input, precision |
| Gain-Bandwidth Product | 11 MHz |
| Slew Rate | 20 V/µs |
| Input Voltage Noise Density | 5.1 nV/√Hz |
| Input Bias Current | 1 pA (typical, JFET) |
| Input Offset Voltage | 5 µV (typical) |
| Quiescent Current per Channel | 1.8 mA |
| Supply Voltage Range (Single) | 4.5 V to 36 V |
| Supply Voltage Range (Dual) | ±2.25 V to ±18 V |
| Type de sortie | Rail-to-Rail |
| Plage de température de fonctionnement | -40 °C to +125 °C |
| Boîtier | 14-pin SOIC (D) |
| Type de montage | Surface Mount |
| Niveau MSL | 2 (1 year floor life) |
| Statut RoHS | Compliant |
| Lead-Free Finish | Yes (NiPdAu) |
Configuration des broches de OPA4140AID
| Broche 1 | OUTA — Channel A output |
| Broche 2 | INA- — Channel A inverting input |
| Broche 3 | INA+ — Channel A non-inverting input |
| Broche 4 | V+ — Positive supply |
| Broche 5 | INB+ — Channel B non-inverting input |
| Broche 6 | INB- — Channel B inverting input |
| Broche 7 | OUTB — Channel B output |
| Broche 8 | OUTC — Channel C output |
| Broche 9 | INC- — Channel C inverting input |
| Broche 10 | INC+ — Channel C non-inverting input |
| Broche 11 | V- — Negative supply |
| Broche 12 | IND+ — Channel D non-inverting input |
| Broche 13 | IND- — Channel D inverting input |
| Broche 14 | OUTD — Channel D output |
Applications typiques
OPA4140AID convient pour 6 applications: High-Impedance Sensor Signal Conditioning, Multi-Channel Data Acquisition Front-End, Precision Instrumentation Amplifier Building Block, Professional Audio Line Driver / Preamplifier, Active Filter and Precision Integrator Circuits, Test and Measurement Instrumentation.
High-Impedance Sensor Signal Conditioning
The OPA4140AID's JFET input stage with 1 pA typical input bias current and 5.1 nV/√Hz voltage noise density makes it ideal for buffering high-impedance transducers such as pH electrodes, photodiodes, piezoelectric sensors, and bio-potential probes. Used as a front-end I/V converter or unity-gain buffer, it minimizes DC error caused by source loading while preserving low-frequency precision. Placed between the sensor and an ADC input with 100 nF ceramic bypass on each supply pin, the OPA4140 delivers cleaner signal integrity than bipolar-input alternatives that suffer from nanoamp-level bias currents degrading the measurement.
Recommandé
Multi-Channel Data Acquisition Front-End
The quad-channel 14-SOIC package enables dense multi-channel analog front-ends for industrial data acquisition systems and modular instrumentation. With four channels per IC, 11 MHz GBW, 20 V/µs slew rate, and 36 V supply tolerance, the OPA4140AID directly accepts ±10 V industrial signals without external protection in many cases. Used as a unity-gain buffer or active filter for each ADC channel, it maintains channel-to-channel matching better than 50 µV offset drift and supports simultaneous-sampling architectures where consistent gain is essential.
Recommandé
Precision Instrumentation Amplifier Building Block
The OPA4140AID can be configured as a discrete three-op-amp instrumentation amplifier using three of its four channels, providing high CMRR (>80 dB typical) for bridge sensor and differential measurement applications. Its low 5 µV offset voltage and low input bias current of 1 pA keep instrumentation amp error well below 0.1% on 1 kΩ bridges. Compared to dedicated INA packages, this discrete approach lets designers tune gain, bandwidth, and noise to the specific transducer while still fitting in a compact 14-SOIC footprint.
Recommandé
Professional Audio Line Driver / Preamplifier
The OPA4140AID's 5.1 nV/√Hz input noise and 20 V/µs slew rate deliver low-distortion audio performance suitable for balanced line drivers, microphone preamps, and DAC output buffers in professional audio gear. The rail-to-rail output swing allows maximum headroom on ±15 V or 24 V analog rails while maintaining <0.0005% THD+N at 1 kHz on line-level signals. Four channels in one package support stereo plus aux channel layouts without thermal strain on the SOIC-14 PCB footprint.
Recommandé
Active Filter and Precision Integrator Circuits
With unity-gain stability, 11 MHz GBW, and 20 V/µs slew rate, the OPA4140AID is well-suited for precision Sallen-Key and multiple-feedback active filters, integrators, and PID controller front-ends. The low input bias current of 1 pA keeps integrator drift well below 1 mV/s on 100 kΩ timing networks, while the wide supply tolerance supports ±15 V analog rails directly. Using the four channels in one 14-SOIC simplifies PCB layout of state-variable filters and quad-channel equalizers.
Recommandé
Test and Measurement Instrumentation
The OPA4140AID fits bench instruments like DMM input buffers, oscilloscope front-end amplifiers, and precision signal sources where low noise and rail-to-rail swing over ±18 V are required. Each channel's 1.8 mA quiescent current and 11 MHz GBW allow it to buffer wide-bandwidth signals without loading the source, while the JFET input prevents high-impedance probe compensation drift. Four channels in one package reduce BOM count for multi-range or multi-channel instruments.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour OPA4140AID — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | OPA4140AIDR | OPA4141AID | OPA4140AIDG4 | OPA4140AIDE4 | OPA4244EA/250 |
|---|---|---|---|---|---|---|
| Package | 14-SOIC (D) | 14-SOIC (D) - same | 14-SOIC (D) - same | 14-SOIC (D) - same | 14-SOIC (D) - same | 14-SOIC - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Channels | 4 | 4 | 4 | 4 | 4 | 4 |
| Gain-Bandwidth Product | 11 MHz | 11 MHz | ~10 MHz | 11 MHz | 11 MHz | 1 MHz |
| Supply Voltage Range | 4.5 V to 36 V | 4.5 V to 36 V | 4.5 V to 36 V | 4.5 V to 36 V | 4.5 V to 36 V | 2.7 V to 36 V |
| Output Type | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail |
Principaux différenciateurs
- JFET input stage with 1 pA bias current (vs OPA4140AIDR)
- Wide 4.5 V to 36 V supply tolerance (vs OPA4244EA/250)
- Rail-to-rail output swing (vs OPA4140AIDG4 / OPA4140AIDE4)
Notes de conception
Use a solid uninterrupted ground plane beneath the OPA4140AID to preserve the JFET input's high-impedance advantage and minimize leakage paths. Place 100 nF ceramic bypass capacitors within 3 mm of each supply pin (V+ pin 4 and V- pin 11) to maintain PSRR above 100 dB at 1 kHz. Keep input traces short and guarded; route them away from switching converter nodes that couple through the SOIC-14 plastic package.
The OPA4140AID is unity-gain stable only for capacitive loads up to 1 nF. Driving longer cables or ADC reference inputs that present >1 nF requires an isolation resistor of 20-50 Ω in series with the output. According to the TI datasheet's stability analysis, omitting this resistor on heavy capacitive loads can cause sustained oscillation above 1 MHz that may damage downstream ADC inputs.
At 36 V supply and 1.8 mA quiescent per channel, the OPA4140 dissipates approximately 0.26 W (quad fully active), resulting in negligible junction temperature rise in the 14-SOIC. Estimated: with theta_JA ~100 °C/W on a 1 oz 4-layer board, junction-to-ambient rise is ~26 °C above ambient. No heatsink is required for typical lab or industrial use.
For high-impedance sensor inputs, add a 10 MΩ input protection resistor in series with each IN+ / IN- pin to limit fault current into the JFET gate during ESD strikes or input over-voltage. According to TI's OPAx140 family application notes, this resistor combined with a 10 pF guard capacitor preserves 1 pA bias-current performance while protecting the JFET oxide.
Informations de conformité
RoHS and REACH compliant per TI product page. Standard OPA4140AID is not AEC-Q100 qualified (industrial grade); for automotive applications consider OPA4140AID-Q1 (separate order code).
