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Texas Instruments OPA145ID
- Part No.:
- OPA145ID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA145ID.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:292
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Product details
Overview
OPA145ID from Texas Instruments is a single-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 while maintaining 150 µV max offset voltage and 1 µV/°C max drift - enabling accurate DC-coupled amplification in semiconductor test equipment and precision data acquisition systems.
For engineers reviewing the OPA145ID datasheet, OPA145ID pinout, OPA145ID application, or OPA145ID equivalent, this page provides verified package mapping (SOIC-8), confirmed pin functions, real-world noise performance (7 nV/√Hz), thermal metrics (RθJA = 136 °C/W), and validated alternatives for sourcing continuity and design flexibility.
Technical Context
The OPA145ID uses a JFET input stage with picoampere-level input bias current (2 pA typ) and ultra-low input current noise (0.8 fA/√Hz), making it suitable for photodiode transimpedance amplifiers and strain-gauge bridges where leakage and noise dominate error budgets. Its input common-mode range extends to the negative rail (V–), simplifying single-supply biasing in isolated front-end stages.
It features rail-to-rail output swing (within 75 mV of rails at RL = 10 kΩ), 123 dB open-loop gain (OPA145ID package), and stable operation into capacitive loads up to 100 pF - supported by internal compensation and characterized overload recovery time (600 ns). The device operates across ±2.25 V to ±18 V dual supply or 4.5 V to 36 V single supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-bandwidth product | 5.5 MHz - enables stable unity-gain buffer or G = +10 amplification up to ~550 kHz without phase margin loss. |
| Slew rate | 20 V/μs - supports clean 10-V step response in ≤6 μs for 16-bit settling in DAQ systems. |
| Input offset voltage (max) | ±150 µV - limits DC error to <0.0015% of full-scale in 10-V output ranges, critical for weigh scale calibration. |
| Offset voltage drift (max) | ±1 µV/°C - contributes ≤125 µV total drift over –40°C to +125°C, ensuring stability in unregulated industrial enclosures. |
| Input bias current (typ) | 2 pA - allows use with >1 GΩ source impedances (e.g., piezoelectric sensors) without significant voltage error. |
| Voltage noise density | 7 nV/√Hz at 1 kHz - dominates total noise in mid-frequency sensor interfaces, outperforming bipolar op-amps above 10 Hz. |
| Supply current (max) | 475 µA - enables battery-powered portable instrumentation with multi-year runtime on coin cells. |
Pinout & Package
OPA145ID is supplied in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, with standard JEDEC MS-012AC footprint and 1.27 mm pitch. Thermal resistance is RθJA = 136 °C/W (JEDEC High-K board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No connection (NC) | Internally unconnected; must be left floating or tied to ground per layout best practice. |
| 2 | Inverting input (–IN) | Differential input node; high-impedance JFET gate requiring guarded trace routing in sensitive applications. |
| 3 | Noninverting input (+IN) | Differential input node; matched to Pin 2 for CMRR optimization; avoid asymmetrical parasitics. |
| 4 | Negative supply (V–) | Lowest potential rail; serves as reference for input common-mode range extending to V– – 0.1 V. |
| 5 | No connection (NC) | Internally unconnected; no external connection required. |
| 6 | Output (OUT) | Rail-to-rail capable output; drives 10 kΩ loads within 75 mV of supply rails at room temperature. |
| 7 | Positive supply (V+) | Highest potential rail; supports up to 36 V single supply or ±18 V dual supply operation. |
| 8 | No connection (NC) | Internally unconnected; leave unpopulated or grounded only if required for mechanical stability. |
Key Features
| Feature | Design Value |
|---|---|
| JFET input architecture | Enables 2 pA typical input bias current and 10¹³ Ω || 5 pF input impedance - essential for high-Z electrochemical and photonic sensors. |
| Rail-to-rail output swing | Delivers ≥99% of full supply range (e.g., 0.075 V to 4.925 V on 5-V rail), maximizing dynamic range into SAR ADCs like ADS8867. |
| Input voltage range includes V– | Accepts common-mode signals down to V– – 0.1 V, eliminating need for negative bias in single-supply transducer interfaces. |
| Low 1/f noise corner | 0.1 Hz to 10 Hz noise = 60 nVRMS - ensures sub-µV stability in slow-sampling metrology and weigh scale zero-drift measurements. |
| EMI rejection ratio | ≥120 dB at 100 MHz - suppresses RF interference from switching power supplies and wireless modules in mixed-signal PCBs. |
Applications
| Semiconductor Test Equipment | Lab Instrumentation |
|---|---|
|
Use Scenario: Precision current sourcing and voltage measurement in parametric testers for wafer-level IC characterization. IC Role / Device Role / Timing Role: Acts as feedback amplifier in Kelvin-connected SMU channels, delivering stable 100-pA to 100-mA sourcing with <1 ppm linearity. Use Value: 150 µV max offset and 1 µV/°C drift ensure calibrated accuracy across thermal soak cycles without recalibration. |
Use Scenario: Low-noise front-end amplification in benchtop digital multimeters and programmable DC sources. IC Role / Device Role / Timing Role: Configured as unity-gain buffer driving 16-bit SAR ADCs, preserving signal integrity from high-impedance DMM input dividers. Use Value: 7 nV/√Hz voltage noise and 0.8 fA/√Hz current noise minimize RMS error in 100-kSPS sampling at 24-bit effective resolution. |
| Source Measurement Unit (SMU) | Data Acquisition Systems |
|
Use Scenario: Bidirectional current sensing and voltage forcing in automated test systems for power MOSFET and GaN HEMT validation. IC Role / Device Role / Timing Role: Serves as transimpedance amplifier for shunt-based current monitoring and as precision reference buffer for DAC outputs. Use Value: 20 V/μs slew rate enables fast settling (<6 µs) during dynamic load transitions, supporting 100-kSPS SMU sweep rates. |
Use Scenario: Signal conditioning for bridge-based sensors (load cells, pressure transducers) in industrial PLC analog input modules. IC Role / Device Role / Timing Role: Provides PGA gain stage with programmable offset correction before 24-bit delta-sigma ADC conversion. Use Value: Rail-to-rail output swing maximizes utilization of 5-V ADC reference, improving SNR by 3 dB versus limited-output op-amps. |
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 |
|---|---|---|---|
| OPA141IDBVT | Lower bandwidth (11 MHz), higher supply current (1.2 mA), same SOIC-8 package; offset drift = ±2 µV/°C (vs. ±1 µV/°C for OPA145ID). | Better for wideband AC-coupled applications but less optimal for low-power DC precision due to 2.5× higher IQ. | Select OPA141IDBVT when bandwidth >8 MHz is required and power budget allows >1 mA per channel. |
| ADA4625-1ARZ | Higher voltage noise (8.7 nV/√Hz), lower input bias current (0.6 pA), SOIC-8; specified for ±15 V only (no 36-V single-supply support). | Superior for ultra-high-Z pH electrodes but incompatible with 36-V industrial power rails or 4.5-V battery operation. | Choose ADA4625-1ARZ only when sub-picoampere bias is mandatory and supply range is constrained to ±15 V. |
Compared with OPA145ID, OPA141IDBVT trades lower precision drift for higher speed and higher power, while ADA4625-1ARZ offers lower bias current at the cost of wider noise and narrower supply range - making OPA145ID the balanced choice for general-purpose high-Z, low-power, rail-to-rail precision amplification.
Availability
OPA145ID is available at Aetrix Electronics and suitable for semiconductor test equipment, lab instrumentation, and data acquisition systems requiring stable component supply, long-term lifecycle assurance, and TI-qualified production-grade traceability.
Supply support for OPA145ID 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 amplifiers and signal chain solutions.
The OPAx145 family was designed specifically for high-accuracy, low-power, high-impedance sensor signal conditioning - targeting applications where JFET input performance, rail-to-rail output, and thermal stability outweigh raw bandwidth requirements.
FAQ
What is the maximum operating supply voltage for OPA145ID?
The OPA145ID supports a single-supply range of 4.5 V to 36 V or dual-supply operation from ±2.25 V to ±18 V. Absolute maximum supply voltage is 40 V (single) or ±20 V (dual), beyond which permanent damage may occur. Operation at 36 V single supply is fully characterized and supported in the datasheet for OPA145ID.
Does OPA145ID have rail-to-rail input capability?
No, OPA145ID does not have rail-to-rail input. Its input common-mode voltage range extends to the negative rail (V– – 0.1 V) but only to (V+) – 3.5 V at temperature extremes. This allows true single-supply operation with inputs referenced to ground, but excludes direct connection to the positive rail without attenuation or level-shifting.
What is the thermal resistance (RθJA) of OPA145ID in SOIC-8 package?
The junction-to-ambient thermal resistance (RθJA) for OPA145ID in the SOIC-8 (D) package is 136 °C/W under JEDEC High-K board conditions. This value assumes standard 2-layer PCB layout with 1-in² copper pour; actual thermal performance improves with enhanced heatsinking or multilayer boards with internal ground planes.
Can OPA145ID drive capacitive loads directly?
OPA145ID is stable with capacitive loads up to 100 pF when configured as a unity-gain buffer, as verified in Figure 6-27 of the datasheet. For loads >100 pF, a series isolation resistor (e.g., 50 Ω) between the output and capacitance is required to maintain phase margin and prevent peaking or oscillation.
Is OPA145ID suitable for photodiode transimpedance applications?
Yes, OPA145ID is well-suited for photodiode TIA designs due to its 2 pA typical input bias current, 0.8 fA/√Hz current noise, and low 1/f noise (60 nVRMS from 0.1–10 Hz). Its JFET input avoids photocurrent errors seen with bipolar inputs, and the V–-referenced input simplifies biasing in photovoltaic mode configurations.
OPA145ID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 1
- 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
- Current - Output / Channel:
- 20 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA145ID FAQ
1.How can I place an order for OPA145ID through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA145ID 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 OPA145ID reliable?
The price and inventory of OPA145ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA145ID is usually 5 days.
3.What payment methods are accepted for OPA145ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA145ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA145ID?
OPA145ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA145ID 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 OPA145ID?
For technical support, including OPA145ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA145ID requirements.
6.How does Aetrix verify that OPA145ID is sourced from the original manufacturer or authorized distributors?
All OPA145ID 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 OPA145ID meets industry standards.
7.What is the process for return or replacement of OPA145ID?
All OPA145ID units undergo pre-shipment inspection (PSI). If there is an issue with OPA145ID, 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 OPA145ID part is unused and in its original packaging.
Return procedure for OPA145ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA145ID Tags
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LM358DR
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