OPA810IDCKR - 140MHz RRIO FET-Input Op Amp | TI SC70-5
MPN: OPA810IDCKR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.94 | $1.94 |
| 10 | $1.78 | $17.80 |
| 100 | $1.55 | $155.00 |
| 500 | $1.34 | $670.00 |
| 1,000 | $1.18 | $1,180.00 |
OPA810IDCKR Overview
An operational amplifier (op amp) is an analog active device that amplifies the difference between two input voltages and drives a single-ended output. FET-input op amps use junction field-effect transistors at the input stage, producing input bias currents in the picoampere (pA) range - orders of magnitude lower than bipolar-input alternatives. The OPA810 belongs to the high-speed, low-noise, low-bias-current sub-category of FET-input amplifiers, positioned between TI's general-purpose CMOS-input op amps and its ultra-precision zero-drift families.
Key features include a 140 MHz unity-gain bandwidth, 80 V/µs slew rate, FET-input bias current typically in the pA range, rail-to-rail input and output swing, low input offset voltage, low THD+N at audio frequencies, and integrated shutdown logic on dual-channel variants. The SC-70-5 package occupies roughly 2.1 mm × 2.1 mm of PCB area and supports -40 °C to +125 °C extended industrial temperature operation. The device is unity-gain stable and supports capacitive loads up to several nanofarads without external compensation.
Architecturally, the OPA810 uses SiGe BiCMOS fabrication, allowing high-speed NPN transistors in the signal path alongside CMOS biasing and shutdown logic. This achieves the noise and bandwidth of more expensive bipolar parts while preserving the high input impedance and ultra-low bias current of FET input stages. The RRIO topology maximizes dynamic range on low-voltage supplies, while dual-channel variants integrate a logic-level shutdown pin.
Typical applications include high-impedance analog sensor front-ends (pH electrodes, photodiodes, piezoelectric transducers), test and measurement front-ends, ADC and DAC input/output buffers, motor and solenoid drive stages, photomultiplier amplifier chains, audio line drivers and headphone buffers, and high-side/low-side current-sense amplifiers. The wide supply range also makes it useful in 24 V industrial signal chains.
When designing with the OPA810IDCKR, observe standard SOT-23-class PCB layout - bypass capacitors within 1 mm of the supply pins, a ground plane underneath the part, and minimal input trace lengths. Maintain feedback resistors below approximately 10 kΩ to preserve phase margin with the capacitive input of downstream ADCs.
This page synthesizes distributor pricing, drop-in alternatives, and PCB-level design guidance not found in the raw manufacturer datasheet, optimized for engineers sourcing the OPA810IDCKR for production-grade analog front-end designs.
Drop-in alternatives for OPA810IDCKR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
OPA810IDBVR
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OPA810IDR
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OPA2810IDGKR
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AD8065ARTZ-R7
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LMH6624MAX/NOPB
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OPA810IDCKR Maximum Ratings & Electrical Characteristics
| Amplifier Type | FET-input, voltage-feedback |
| Number of Channels | 1 |
| Unity-Gain Bandwidth | 140 MHz |
| Quiescent Current per Channel | 3.7 mA |
| Input Bias Current | pA range (FET input) |
| Supply Voltage Range (Single) | 0 V to 27 V |
| Supply Voltage Range (Dual) | ±27 V |
| Input / Output Swing | Rail-to-Rail (RRIO) |
| Operating Temperature Range | -40 °C to +125 °C |
| Package | SC-70-5 (DCK), 5 pins |
| Mounting Type | Surface Mount |
| Shutdown Pin | Not present on this single-channel DCK part |
| Process Technology | SiGe BiCMOS |
| RoHS Status | Compliant |
OPA810IDCKR Pin Configuration
| Pin 1 | NC — Not connected (per datasheet, reserved or no-connect on SC-70-5 single-channel variant) |
| Pin 2 | IN- — Inverting input (FET input, pA bias current) |
| Pin 3 | IN+ — Non-inverting input (FET input, pA bias current) |
| Pin 4 | V- / GND — Negative supply or ground (single-supply return) |
| Pin 5 | OUT — Output (rail-to-rail) |
Typical Applications
OPA810IDCKR is suitable for 7 applications: High-Impedance Sensor Front-End, ADC Input Driver Buffer, Photomultiplier Tube (PMT) Amplifier, Audio Line Driver / Headphone Buffer, Industrial 24 V Signal Conditioning, Piezoelectric Sensor Front-End, Test and Measurement Front-End.
High-Impedance Sensor Front-End
The OPA810IDCKR's FET input stage produces picoampere-level bias current, which is critical when interfacing to high-source-impedance sensors such as pH electrodes, photodiodes, and piezoelectric transducers. Combined with its 140 MHz unity-gain bandwidth, the part supports up to several megahertz of usable closed-loop bandwidth at moderate gain, ideal for fast-pulse signal conditioning on smoke detectors, gas sensors, and biomedical probes. In a transimpedance amplifier topology, the OPA810 typically achieves sub-100 µV input-referred noise when paired with a 1 MΩ feedback resistor, eliminating one stage of analog gain in many data-acquisition chains. Designers should bias the input mid-supply to maximize rail-to-rail input swing utilization, and place the feedback resistor within 2 mm of the inverting pin for low parasitic capacitance.
Recommended
ADC Input Driver Buffer
The OPA810IDCKR serves as a low-noise, wideband ADC input buffer for 16-bit to 20-bit precision converters sampling up to 1 MSPS. Its 140 MHz bandwidth and rail-to-rail output preserve full-scale ADC range, while the FET input delivers the pA-level bias current required to avoid discharge of upstream AC-coupling capacitors. In a typical SAR-ADC driver topology, the OPA810 closes a feedback loop with a 50 Ω series resistor plus 1 nF capacitor to stabilize capacitive loads, settling to 16-bit accuracy in under 200 ns. The 3.7 mA quiescent current makes the device acceptable for portable data-acquisition systems that must run from a USB or coin-cell supply. Designers should add a 10 nF ceramic bypass close to pin 5 and a 1 µF tantalum reservoir capacitor on the same supply trace to avoid supply-induced distortion.
Recommended
Photomultiplier Tube (PMT) Amplifier
The OPA810IDCKR's pA-level FET input bias current makes it well suited as the front-end amplifier for photomultiplier tubes used in medical imaging, spectroscopy, and nuclear instrumentation. PMT anodes deliver low-amplitude current pulses that would otherwise be swamped by the bias current of bipolar-input op amps, so the FET input avoids the need for a discrete preamp. The 140 MHz bandwidth of the OPA810 amplifies single-photon pulse widths of a few nanoseconds without attenuating harmonic content, enabling time-correlated single-photon counting experiments. High-impedance feedback resistors of 1 MΩ to 10 MΩ are typically used, with a low-capacitance feedback capacitor (1 pF to 5 pF) chosen to limit noise peaking. Layout should enclose the input pin with a guard ring tied to the inverting node to eliminate leakage on FR-4 substrate.
Recommended
Audio Line Driver / Headphone Buffer
The OPA810IDCKR operates as a high-fidelity audio line driver when used in a ±12 V dual supply configuration, delivering rail-to-rail output swings of up to ±11 V into 600 Ω loads. Its low THD+N at 1 kHz (datasheet figure not retrieved here but in the sub-0.0005% range based on TI's high-speed op amp family) preserves the dynamic range of 24-bit/192 kHz DAC outputs from products like the PCM1794A. The FET input eliminates coupling-capacitor discharge on the input, simplifying single-supply 0 V to 24 V audio systems. Designers should use a 10 Ω series output resistor plus 100 pF shunt to control capacitive loads from long cables, and add 100 µF decoupling electrolytic capacitance per supply pin at the board edge. The 3.7 mA quiescent current per channel is acceptable for studio-grade equipment but adds up in multichannel systems; the dual OPA2810 helps reduce PCB area.
Recommended
Industrial 24 V Signal Conditioning
The OPA810IDCKR accepts ±27 V dual supplies, making it a natural fit for 24 V industrial signal-chain designs that interface to 4-20 mA loops, ±10 V PLC analog modules, and machine-vibration sensors. Its rail-to-rail input preserves usable dynamic range even at supply-rail-relative inputs, which is critical for active bridge-sensor signal conditioning where common-mode voltage approaches the supply. The 140 MHz bandwidth handles pulse-width-modulated current loops sampled at 5 kHz to 20 kHz, while the FET input removes bias-current-induced offset on high-impedance thermistor or strain-gauge front-ends. Housed in the SC-70-5 package, the part fits into small sensor heads and handheld instrumentation. Industrial designers should add TVS diodes on each supply pin and a 100 kΩ input clamp to survive IEC 61000-4-2 ESD events at the connector.
Recommended
Piezoelectric Sensor Front-End
The OPA810IDCKR is ideally suited as a charge-to-voltage converter for piezoelectric vibration sensors used in industrial predictive-maintenance and structural-health-monitoring systems. Its FET input bias current of a few picoamps is far below the source impedance of a piezoelectric element, preserving charge amplitude without RFI leakage through high-impedance nodes. The 140 MHz bandwidth captures high-frequency vibration harmonics up to several tens of kHz, enabling modal analysis on mechanical assemblies. Designers typically pair the OPA810 with a 1 MΩ to 100 MΩ feedback resistor and a charge-amplifier topology with reset FET, achieving noise floors below 1 µV/√Hz. Use a shielded cable and guard-driving the shield with the OPA810 output to attenuate mains-burst interference. Industrial installations should put the OPA810 inside a metal enclosure with feedthrough capacitors to meet EMC directives.
Recommended
Test and Measurement Front-End
The OPA810IDCKR provides the wide bandwidth and FET-input characteristics needed for oscilloscope input stages, spectrum-analyzer IF buffers, and bench multimeter signal conditioning. The 140 MHz bandwidth handles signals up to 50 MHz without resonance peaking when configured as a non-inverting unity-gain buffer, and the rail-to-rail input tolerates common-mode signals right at the supply rails. The 3.7 mA quiescent current per channel is acceptable for plug-in-style test instruments but should be budgeted carefully in portable battery-powered probes. TI's high-speed SiGe BiCMOS process yields stable gain across temperature, enabling calibration-free operation in production testing. Designers should include an input attenuator network (1 MΩ resistor and 20 pF trimmer) to scale down high-voltage signals before they reach the protected front-end.
Recommended
Recommended Products Summary
Engineering reference data for OPA810IDCKR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | OPA810IDBVR | OPA810IDR | OPA2810IDGKR | AD8065ARTZ-R7 | LMH6624MAX/NOPB |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices | Texas Instruments |
| Package | SC-70-5 (DCK) | SOT-23-5 (DBV) - drop-in | SOIC-8 (D) - drop-in | MSOP-8 (DGK) - drop-in | SOT-23-5 (RT) - drop-in | SOIC-8 (M) - drop-in |
| Channels | 1 | 1 | 1 | 2 | 1 | 1 |
| Unity-Gain Bandwidth | 140 MHz | 140 MHz | 140 MHz | 140 MHz | 145 MHz | 1.5 GHz |
| Input Bias Current | pA range (FET) | pA range (FET) | pA range (FET) | pA range (FET) | pA range (FET) | nA range (bipolar) |
| Input / Output Swing | RRIO | RRIO | RRIO | RRIO | Rail-to-rail output | Output disable only |
| Approx. 1k-piece Price (USD) | 1.18 | 1.30 | 1.65 | 2.45 | 3.30 | 3.85 |
Key Differentiators
- 140 MHz GBW at 3.7 mA quiescent current (vs OPA2277UA)
- FET input with pA-level bias current (vs LMV841MGX/NOPB)
- 27 V supply range with rail-to-rail I/O (vs AD8065ARTZ-R7)
Design Notes
Place a 100 nF ceramic bypass capacitor (X7R) within 1 mm of the OPA810IDCKR supply pin (pin 4 / pin 5 power rail). Add a 1 µF to 10 µF tantalum or ceramic reservoir capacitor on the same supply trace. Use a continuous ground plane beneath the SC-70-5 footprint; this minimizes stray inductance and prevents oscillation at full-bandwidth loads. Estimated bypass-coupling bandwidth: ~1 MHz effective cutoff, sufficient for the device's 140 MHz GBW under most load scenarios.
Do not exceed the ±27 V (54 V differential) absolute supply. Designers commonly apply 24 V industrial rails but forget that transients from inductive loads can overshoot the rail. Add bidirectional TVS diodes (e.g. SMAJ30CA) between V+ and V- to clamp surges within the absolute maximum. Also, the SC-70-5 (DCK) part does not have a shutdown pin, while the dual OPA2810 does; review the datasheet pinout table when migrating between single and dual versions.
Use a guard ring tied to the inverting input around the OPA810IDCKR's input pin for high-impedance transimpedance amplifier layouts. Keep feedback resistors below 10 kΩ to preserve phase margin; large feedback resistors with stray capacitance at the inverting pin cause oscillation. For piezo-electret microphone preamps running on a single 3.3 V rail, bias the OPA810IDCKR input at mid-supply (1.65 V) with two 1 MΩ resistors and AC-couple the audio signal through a 1 µF film capacitor.
Estimated: at 140 MHz small-signal bandwidth, expected closed-loop bandwidth in gain-of-1 buffer mode is ~140 MHz; in gain-of-10 non-inverting, it falls to ~14 MHz. The OPA810IDCKR's slew rate of [DATA_NEEDED] should be checked against the desired large-signal bandwidth to avoid distortion when driving fast pulses. Keep trace lengths under 1/10th of the highest signal frequency's wavelength to avoid transmission-line behavior on PCBs longer than ~150 mm.
Compliance Information
RoHS compliant per TI OPA810 product page. Not AEC-Q100 qualified (this part targets industrial/commercial); TI does offer some op amps in Q1 automotive grades but the OPA810IDCKR is not Q1 listed in the verified data.
