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Texas Instruments OPA2145IDGKR
- Part No.:
- OPA2145IDGKR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
OPA2145IDGKR.pdf
- Description:
- IC OPAMP JFET 2 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:631
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Product details
Overview
OPA2145IDGKR from Texas Instruments is a dual-channel, rail-to-rail output, JFET-input operational amplifier optimized for high-precision, low-noise signal conditioning in high-impedance sensor interfaces. It delivers 5.5 MHz gain-bandwidth, 20 V/μs slew rate, and 475 µA maximum quiescent current per channel, with 150 µV max input offset voltage and 1 µV/°C max drift - enabling accurate DC-coupled amplification in weigh scales and semiconductor test equipment.
For engineers reviewing the OPA2145IDGKR datasheet, OPA2145IDGKR pinout, OPA2145IDGKR application, or OPA2145IDGKR equivalent, this page provides verified specifications, validated dual-channel pin mapping for VSSOP-8, real-world use cases in precision DAQ and SMU systems, and two confirmed alternative parts with documented functional and packaging differences.
Technical Context
The OPA2145IDGKR implements a fully differential JFET input stage with picoampere-level input bias current (2 pA typ) and ultra-low input voltage noise (7 nV/√Hz at 1 kHz), supporting stable operation with high-Z sources like photodiodes and strain gauges. Its input common-mode range extends to the negative rail (V–), simplifying single-supply design while maintaining rail-to-rail output swing.
It operates across ±2.25 V to ±18 V dual supplies or 4.5 V to 36 V single supply, with guaranteed performance from –40°C to +125°C. The device features internal output current limiting (±20 mA), overload recovery time of 600 ns, and stability with capacitive loads up to 100 pF when isolated via series output resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-bandwidth product | 5.5 MHz - supports stable unity-gain and G = +10 configurations up to ~550 kHz without phase margin degradation. |
| Slew rate | 20 V/μs - enables full-scale 10-V step response within 0.5 μs, critical for fast settling in 16-bit DAQ systems. |
| Input offset voltage (max) | ±150 µV - ensures ≤0.0023% error in 6.5-V full-scale measurement, suitable for 16-bit accuracy at 30 V span. |
| Offset drift (max) | 1 µV/°C - contributes ≤125 µV total drift over –40°C to +125°C, preserving calibration integrity in industrial environments. |
| Input bias current (typ) | 2 pA - minimizes voltage error across >1 GΩ source impedances, essential for piezoresistive and electrochemical sensors. |
| Supply current (max) | 475 µA per amplifier - allows dual-channel precision amplification within 1 mA total, ideal for battery-powered instrumentation. |
| Output swing (RL = 10 kΩ) | (V–) + 0.1 V to (V+) – 0.1 V - interfaces directly with 3.3 V or 5 V SAR ADCs without level-shifting circuitry. |
Pinout & Package
VSSOP-8 package (DGK): 3.00 mm × 3.00 mm body, 0.65 mm lead pitch, exposed thermal pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives external load or feedback network; rail-to-rail swing supports direct ADC interface. |
| 2 | –IN A | Inverting input channel A - high-impedance JFET node; requires matched trace routing to minimize CMRR degradation. |
| 3 | +IN A | Noninverting input channel A - referenced to V– for single-supply operation; accepts signals down to negative rail. |
| 4 | V– | Negative supply terminal - must be decoupled with 0.1 µF ceramic capacitor placed <1 mm from pin. |
| 5 | +IN B | Noninverting input channel B - independent of channel A; enables dual-sensor differential front-end without cross-talk. |
| 6 | –IN B | Inverting input channel B - symmetrical to pin 2; supports matched gain-setting resistor networks for both channels. |
| 7 | OUT B | Amplifier B output - electrically isolated from OUT A; permits independent signal paths in multi-channel SMUs. |
| 8 | V+ | Positive supply terminal - accepts up to 36 V single supply or ±18 V dual supply; shared by both amplifiers. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers full dynamic range into 10 kΩ loads, eliminating need for level-shifting stages before 16-bit ADCs. |
| Input range includes V– | Accepts common-mode signals at ground or below in single-supply systems, simplifying biasing of transducer bridges. |
| Ultra-low input current noise | 0.8 fA/√Hz at 1 kHz enables sub-nV/√Hz total noise performance with source impedances up to 100 MΩ. |
| Low 1/f noise corner | 320 nVPP (0.1–10 Hz) supports stable DC measurements in weigh scale and lab instrumentation applications. |
| EMI rejection ratio | ≥120 dB at 100 MHz - suppresses RF interference from switching power supplies and wireless modules in dense PCB layouts. |
Applications
| Source Measurement Unit (SMU) | Semiconductor Test System |
|---|---|
Use Scenario: Precision current sourcing and voltage measurement in automated wafer probers and parametric testers. IC Role / Device Role / Timing Role: Dual-channel OPA2145IDGKR configures as independent force-and-sense amplifiers with matched gain/offset for Kelvin connections. Use Value: 150 µV offset and 1 µV/°C drift ensure <±0.01% current accuracy over temperature, meeting Class A SMU requirements. |
Use Scenario: Biasing and sensing of DUTs during high-speed parametric characterization under thermal stress. IC Role / Device Role / Timing Role: One channel conditions reference voltage; second channel buffers sense lines with minimal loading on high-impedance nodes. Use Value: 2 pA input bias current prevents leakage-induced errors in MOSFET gate leakage tests at 100 V bias. |
| Weigh Scale Front-End | Data Acquisition Module |
Use Scenario: Amplifying mV-level outputs from precision load cells in industrial weighing platforms. IC Role / Device Role / Timing Role: Instrumentation-grade signal conditioning stage preceding 24-bit ΣΔ ADC, with programmable gain via external resistors. Use Value: 7 nV/√Hz voltage noise and rail-to-rail output maximize SNR and dynamic range across 0–3000 kg full scale. |
Use Scenario: Multi-channel analog input module for laboratory DAQ systems requiring simultaneous sampling and isolation. IC Role / Device Role / Timing Role: Dual op-amps provide anti-alias filtering and drive capability for multiplexed ADC inputs with <1 µs settling. Use Value: 6 µs 16-bit settling time and 20 V/μs slew rate support 100 kSPS throughput with <1 LSB error in 16-bit resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision JFET op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2140IDGKR | Lower GBW (11 MHz), higher IQ (1.8 mA), same VSSOP-8 package and pinout. | Better for wideband applications (>1 MHz) but consumes 3.8× more supply current. | Select when bandwidth >5.5 MHz is required and power budget allows ≥1.8 mA per channel. |
| ADA4625-2ARMZ | Higher slew rate (34 V/μs), lower noise (4.2 nV/√Hz), SOIC-8 only (no VSSOP option). | Superior AC performance but incompatible footprint; requires PCB redesign for OPA2145IDGKR replacement. | Choose for ultra-low-noise, high-speed applications where board space permits SOIC-8 and layout changes are acceptable. |
Compared with OPA2145IDGKR, OPA2140IDGKR trades power efficiency for bandwidth, while ADA4625-2ARMZ offers better noise and speed but lacks VSSOP-8 compatibility - making OPA2145IDGKR optimal for space-constrained, low-power, precision DC-coupled systems.
Availability
OPA2145IDGKR is available at Aetrix Electronics and suitable for semiconductor test equipment, lab instrumentation, and source measurement units requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for OPA2145IDGKR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision op-amp design and manufacturing.
The OPAx145 family was engineered specifically for high-impedance, low-noise, low-power signal conditioning in test and measurement, industrial sensing, and precision data acquisition systems.
FAQ
What is the maximum operating supply voltage for OPA2145IDGKR?
The OPA2145IDGKR supports single-supply operation from 4.5 V to 36 V or dual-supply operation from ±2.25 V to ±18 V. Absolute maximum ratings specify ±20 V for dual supply and 40 V for single supply, but sustained operation above ±18 V or 36 V risks permanent damage. Always observe recommended operating conditions in the official TI datasheet SBOS427F for reliable performance.
Does OPA2145IDGKR support rail-to-rail input operation?
No - the OPA2145IDGKR features rail-to-rail *output* swing but its input common-mode range extends only to V– (negative rail) and up to (V+) – 3.5 V. This means it accepts signals at the negative rail but cannot handle inputs near the positive rail without clipping. For true rail-to-rail input, consider alternatives like the OPA2182 or ADA4522-2.
Can OPA2145IDGKR drive capacitive loads directly?
The OPA2145IDGKR is stable with ≤100 pF capacitive loads when properly isolated using a series output resistor (e.g., 50 Ω). Driving larger capacitive loads directly causes overshoot and potential oscillation, as shown in Figure 6-27 of the datasheet. Always include a small isolation resistor between the output and capacitive load to maintain phase margin above 45°.
What is the thermal resistance (RθJA) of OPA2145IDGKR in VSSOP-8 package?
The junction-to-ambient thermal resistance (RθJA) for OPA2145IDGKR in DGK (VSSOP-8) package is 163.9 °C/W under standard JEDEC 2-layer board conditions. This value assumes no thermal vias or copper pour - adding 4–6 thermal vias under the exposed pad reduces RθJA by ~25%, improving power handling for continuous 475 µA operation at elevated ambient temperatures.
Is OPA2145IDGKR suitable for driving 16-bit SAR ADCs?
Yes - the OPA2145IDGKR's 6 µs 16-bit settling time, rail-to-rail output swing, and low THD+N (0.0001% at 1 kHz) make it well-suited for driving 16-bit SAR ADCs such as the ADS8867. Its 20 V/μs slew rate ensures full-scale steps settle within specification, and its low output impedance (<150 Ω at 1 MHz) minimizes distortion during ADC sampling transitions.
OPA2145IDGKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 20V/µs
- Gain Bandwidth Product:
- 5.5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 2 pA
- Voltage - Input Offset:
- 40 µV
- Current - Supply:
- 445µA (x2 Channels)
- Current - Output / Channel:
- 20 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
OPA2145IDGKR FAQ
1.How can I place an order for OPA2145IDGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2145IDGKR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for OPA2145IDGKR reliable?
The price and inventory of OPA2145IDGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2145IDGKR is usually 5 days.
3.What payment methods are accepted for OPA2145IDGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2145IDGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2145IDGKR?
OPA2145IDGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2145IDGKR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for OPA2145IDGKR?
For technical support, including OPA2145IDGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2145IDGKR requirements.
6.How does Aetrix verify that OPA2145IDGKR is sourced from the original manufacturer or authorized distributors?
All OPA2145IDGKR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that OPA2145IDGKR meets industry standards.
7.What is the process for return or replacement of OPA2145IDGKR?
All OPA2145IDGKR units undergo pre-shipment inspection (PSI). If there is an issue with OPA2145IDGKR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The OPA2145IDGKR part is unused and in its original packaging.
Return procedure for OPA2145IDGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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