OPA2107AU/2K5 - Precision Dual Difet Op Amp 4.5MHz SOIC-8 | TI
MPN: OPA2107AU/2K5 β End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.2 | $6.20 |
| 10 | $5.65 | $56.50 |
| 100 | $5.1 | $510.00 |
| 500 | $4.65 | $2,325.00 |
| 1,000 | $4.2 | $4,200.00 |
| 2,500 | $3.9 | $9,750.00 |
OPA2107AU/2K5 Overview
An operational amplifier is a high-gain voltage amplifier with differential inputs and a single-ended output that forms the core building block of analog signal chains. Within the amplifier hierarchy, the OPA2107 belongs to the precision JFET-input (Difet) family: precision op amps trade some speed for ultra-low offset, low drift, and low bias current, positioning them above general-purpose amplifiers for measurement-grade signal conditioning but below high-speed amplifiers for video or RF applications.
Key features include very low noise at 10 kHz, a maximum offset voltage of 1 mV with maximum drift of 10 uV/C, and a maximum input bias current of 10 pA enabled by the Difet junction-isolation process. The dual-channel integration matches two matched amplifiers on one die, improving thermal tracking between channels. Fast settling to 0.01% and unity-gain stability allow use in active filters and DAC buffers without external compensation.
The Difet dielectric isolation technology keeps bias current low across the full temperature range, unlike standard JFET parts whose bias doubles roughly every 10C. This preserves high-impedance sensor accuracy in warm environments.
Typical applications from the manufacturer datasheet include data acquisition front ends, DAC output amplifiers, optoelectronic receivers, and high-impedance sensor interfaces such as photodiode and pH probe amplifiers.
Design consideration: note this part is in the process of being discontinued per TI, so new designs should qualify a replacement early. The /2K5 suffix denotes tape-and-reel packaging of the standard OPA2107AU die.
This page synthesizes distributor pricing, drop-in alternatives, pinout data, and practical design notes not found in the manufacturer datasheet, with availability verified as of 2026-09-13.
Drop-in alternatives for OPA2107AU/2K5 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with OPA2107AU/2K5 (same form factor and footprint) β differing in Amplifier Type, Package, Supply Voltage Range, Mounting Type, Number of Channels.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
OPA2107BM
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$7.95 / Unit
View Datasheet βOPA2132UA
β Drop-Inπ Reference alternative (not in catalog)
OPA277UA/2K5
β Drop-Inπ Reference alternative (not in catalog)
OPA602AU/2K5
β Drop-Inβ In Stock
$10.5 / Unit
View Datasheet βOPA2107KP
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
OPA2107AU/2K5 Maximum Ratings & Electrical Characteristics
| Number of Channels | 2 |
| Gain Bandwidth Product | 4.5 MHz |
| Supply Voltage Range | Up to 30 V total (typ. +/-15 V) |
| Input Offset Voltage | 1 mV max |
| Offset Voltage Drift | 10 uV/C max |
| Input Bias Current | 10 pA max |
| Input Voltage Noise | Low noise at 10 kHz (see datasheet for value) |
| Settling Time | Fast settling to 0.01% |
| Stability | Unity-gain stable |
| Amplifier Type | Precision Difet (JFET input) operational amplifier |
| Operating Temperature Range | -25C to +85C |
| Package | 8-pin SOIC (D) |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (/2K5 suffix, 2500 units per reel) |
| RoHS Status | Compliant |
| REACH Status | Compliant |
| Lifecycle Status | In process of being discontinued |
OPA2107AU/2K5 Pin Configuration
| Pin 1 | OUT A β Channel A output |
| Pin 2 | -IN A β Channel A inverting input |
| Pin 3 | +IN A β Channel A non-inverting input |
| Pin 4 | V- β Negative supply |
| Pin 5 | +IN B β Channel B non-inverting input |
| Pin 6 | -IN B β Channel B inverting input |
| Pin 7 | OUT B β Channel B output |
| Pin 8 | V+ β Positive supply |
Typical Applications
OPA2107AU/2K5 is suitable for 6 applications: Data Acquisition Front Ends, DAC Output Amplifiers, Photodiode and Optoelectronic Receivers, High-Impedance Sensor Interfaces, Active Filters and Precision Signal Chains, Instrumentation and Test Equipment Retrofit.
Data Acquisition Front Ends
The OPA2107AU/2K5 fits data acquisition signal conditioning where its 1 mV max offset and 10 uV/C drift keep gain-stage errors inside a 12- to 16-bit system's LSB budget. The 4.5 MHz gain bandwidth supports gains of 10 to 100 while maintaining settling adequate for medium-speed multiplexed ADC inputs, and the 10 pA max bias current prevents loading of high-source-impedance signals upstream of the multiplexer. Placed as a non-inverting gain stage ahead of the ADC with a low-value series resistor for input protection, the Difet input preserves accuracy across the -25C to +85C industrial range. The dual-channel integration also lets one package buffer both the signal and the ADC reference divider, improving channel-to-channel thermal tracking. Trade-off: at large gains, verify the 0.01% settling time against your ADC sampling rate, since bandwidth rolls off with closed-loop gain.
Recommended
DAC Output Amplifiers
The manufacturer datasheet lists DAC output buffering as a primary OPA2107 application. Current-output DACs require a transimpedance stage with low bias current so the DAC's full-scale current is not shunted by amplifier input current error; the OPA2107's 10 pA max Difet bias current makes this error negligible for typical 1-2 mA DAC full-scale currents. Fast settling to 0.01% and unity-gain stability allow direct compensation-free use in the feedback loop of a current-to-voltage converter with a wide range of feedback capacitor values. The dual channels let one SOIC-8 buffer both the signal output and a complementary reference or I/U stage. Performance consideration: at bipolar +/-15 V supplies the output swing supports Β±10 V signal ranges, but check the datasheet output short-circuit and capacitive-load guidance to avoid ringing when driving long cables.
Recommended
Photodiode and Optoelectronic Receivers
Optoelectronics - photodiode receivers in particular - demand the OPA2107's combination of 10 pA max input bias current and low noise at 10 kHz. In a transimpedance configuration, the photodiode capacitance and the feedback resistor set the noise gain peaking; the 4.5 MHz gain bandwidth provides enough loop margin for typical TIA feedback networks in the 100 kΞ© to 10 MΞ© range. Because Difet bias current stays low at elevated temperatures, dark-current measurement accuracy does not degrade the way it would with a standard JFET-input amplifier in an enclosed instrument. Layout note: keep the summing node trace short and guard it with a driven shield connected to the non-inverting input reference to preserve the sub-pA-level effective error. The dual channels enable differential photodiode pairs or a TIA plus post-gain stage in one footprint.
Recommended
High-Impedance Sensor Interfaces
pH probes, piezoelectric accelerometers, and capacitive sensors present source impedances from megohms to gigohms, where input bias current converts directly into offset error: 10 pA across a 10 MΞ© source is already 100 uV. The OPA2107AU/2K5's Difet input stage, specified at 10 pA max bias and 1 mV max offset, was designed for exactly this class of interface, as stated in the manufacturer's applications list. Use the non-inverting configuration with high-value (1-10 MΞ©) bias-return resistors, and route the high-impedance node on a guarded PCB island to limit leakage. The -25C to +85C range covers most industrial environments, but note that any residual input current roughly doubles every 10C, so position the amplifier away from heat sources for the best low-level accuracy in warm enclosures.
Recommended
Active Filters and Precision Signal Chains
Unity-gain stability and fast 0.01% settling make the OPA2107AU/2K5 well suited to Sallen-Key and multiple-feedback active filters in audio and instrumentation bandwidths. The 4.5 MHz gain bandwidth supports accurate filter corner frequencies up to tens of kilohertz without significant Q degradation: as a rule of thumb, keep the filter corner at least 100x below the bandwidth to hold passives-dominated accuracy. The dual channels implement a two-pole section per package, and Difet bias current allows the multi-megohm resistor values that keep capacitor sizes practical in low-frequency designs. Precision consideration: use 1% or better resistors and C0G/NP0 capacitors, since passive tolerance, not the amplifier, will dominate the response accuracy. The Β±15 V supply capability preserves headroom for large-signal filter applications.
Recommended
Instrumentation and Test Equipment Retrofit
Because the OPA2107AU/2K5 runs on Β±15 V rails with a 30 V total supply limit, it is a direct fit for maintaining and retrofitting legacy bench instruments, data loggers, and industrial controllers built around Β±15 V analog subsystems. Its industry-standard dual op-amp SOIC-8 pinout means failed or EOL general-purpose duals in existing boards can frequently be requalified onto the OPA2107 with minimal redesign - valuable now that TI has marked the part as discontinued and engineers must both source remaining stock and plan second-source qualification. The Difet precision (1 mV offset, 10 pA bias) often exceeds the specification of the original general-purpose parts, upgrading measurement margin during repair. For repairs, prefer date-code-recent authorized stock and document the substitute selection for quality traceability.
Recommended
Recommended Products Summary
Engineering reference data for OPA2107AU/2K5 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | OPA2107BM | OPA2132UA | OPA277UA/2K5 | OPA602AU/2K5 |
|---|---|---|---|---|---|
| Package | SOIC-8 (D) | SOIC-8 (D) - same | SOIC-8 (D) - same | SOIC-8 (D) - same | SOIC-8 (D) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Input Bias Current (max) | 10 pA | 10 pA (same die) | JFET input, pA-class | Higher (bipolar input, nA-class) | pA-class (FET input) |
| Lifecycle Status | Being discontinued (EOL) | Same family - verify status | Active | Active | Same family - verify status |
Key Differentiators
- Difet input with 10 pA max bias current (vs OPA277UA/2K5)
- B-grade die option within same footprint (vs OPA2107BM)
- Faster small-signal dynamics (vs OPA277UA/2K5)
Design Notes
The OPA2107AU/2K5 is in the process of being discontinued according to TI.com. If this part is in a production BOM, execute a last-time-buy sized to your field-failure forecast, and qualify OPA2107BM (same die, B-grade) or OPA277UA/2K5 (SOIC-8 footprint-compatible) as the second source now rather than at shortage time. Broker-channel material should be date-code verified and, ideally, electrically sampled, since EOL parts attract counterfeit stock.
For high-impedance nodes (photodiode anode, pH probe, or charge integrator summing junction), place the OPA2107 within a few millimeters of the sensor and surround the input trace with a guard ring driven from the low-impedance reference (typically the non-inverting input potential). Difet inputs have 10 pA max bias, but PCB surface leakage across a contaminated board can exceed this by orders of magnitude - guarding plus a no-clean or conformal flux strategy preserves the low-bias advantage.
Decouple V+ and V- with 0.1 uF ceramic capacitors placed within a few millimeters of pins 8 and 4, plus a 4.7-10 uF bulk capacitor per rail. At +/-15 V the 30 V total supply limit leaves no margin for rail transients: Estimated - a 15.5 V per-rail surge from an unregulated supply would put the part beyond its ratings, so verify worst-case rail excursions (including turn-off undershoot on the opposite rail) against the absolute maximum ratings. Series input resistors protect against electrostatic and overvoltage events at high-impedance inputs.
Compliance Information
Per Abacus Technologies distributor compliance data: EU RoHS Compliant, REACH Compliant, PFAS: NO, DRC Status: DRC Conflict Free. Halogen-free status not stated in provided data.
