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Texas Instruments OPA145IDBVT
- Part No.:
- OPA145IDBVT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA145IDBVT.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:684
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Product details
Overview
OPA145IDBVT 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 product, 20 V/μs slew rate, and 475 µA maximum quiescent current across ±2.25 V to ±18 V or 4.5 V to 36 V supplies - enabling accurate amplification of microvolt-level signals in portable and industrial instrumentation.
For engineers reviewing the OPA145IDBVT datasheet, OPA145IDBVT pinout, OPA145IDBVT application, or OPA145IDBVT equivalent, this page provides verified specifications, package-specific terminal mapping (SOT-23-5), real-world use cases in source measurement units and weigh scales, and two validated alternative parts with documented functional and parametric differences.
Technical Context
The OPA145IDBVT implements a precision JFET input stage with picoampere-level input bias current (2 pA typical) and ultra-low offset drift (±1 μV/°C max), enabling stable DC-coupled amplification over temperature. Its input common-mode range extends to the negative rail (V–), simplifying single-supply biasing while maintaining >126 dB CMRR at ±18 V.
Internally compensated for unity-gain stability, it drives capacitive loads up to 100 pF directly and supports rail-to-rail output swing within 75 mV of either supply under 10 kΩ load - critical for interfacing with 16-bit SAR ADCs like the ADS8867 without external level-shifting circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-bandwidth product | 5.5 MHz - enables stable closed-loop operation up to 100 kHz with G = +10, suitable for high-resolution DAQ front-ends. |
| Slew rate | 20 V/μs - supports full-scale 10-V step settling in ≤6 μs for 16-bit accuracy, matching timing requirements of 100-kSPS ADCs. |
| Input offset voltage | ±150 μV max - ensures <0.01% gain error in 10-mV full-scale transducer outputs without trimming. |
| Input bias current | 2 pA typical - preserves signal integrity from >1 GΩ sources such as photodiodes and piezoresistive sensors. |
| Voltage noise density | 7 nV/√Hz at 1 kHz - contributes <1.5 μV RMS integrated noise in 10 Hz–100 kHz bandwidth, critical for sub-μV signal recovery. |
| Supply current | 475 µA max - allows battery-powered SMUs and handheld test equipment to achieve >100-hour runtime on coin-cell batteries. |
| Common-mode input range | Extends to V– - eliminates need for negative supply in single-supply systems interfacing to ground-referenced sensors. |
Pinout & Package
OPA145IDBVT is packaged in a 5-pin SOT-23 (DBV) footprint measuring 2.90 mm × 1.60 mm, optimized for space-constrained PCB layouts in portable instrumentation and sensor modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: OUT | Output | Amplified signal node; rail-to-rail swing (V– + 0.075 V to V+ – 0.075 V) enables direct connection to 3.3 V or 5 V ADC references. |
| 2: V– | Negative supply | Lowest potential supply rail; input common-mode range includes this pin, supporting true single-supply operation down to 4.5 V total. |
| 3: +IN | Noninverting input | High-impedance (10¹³ Ω || 4.3 pF) node for reference or sensor signal routing; minimal loading on high-Z sources. |
| 4: –IN | Inverting input | Differential input node; matched to +IN for optimal CMRR; requires symmetric layout to preserve >126 dB rejection. |
| 5: V+ | Positive supply | Highest potential supply rail; supports up to 36 V single-supply or ±18 V dual-supply operation with thermal derating. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers full dynamic range into 10 kΩ loads within 75 mV of each rail - eliminates level-shifting stages before precision ADCs. |
| JFET input architecture | 2 pA input bias current enables stable amplification of signals from photodiodes, strain gauges, and pH electrodes without guard traces. |
| Ultra-low offset drift | ±1 μV/°C max ensures <1.25 μV total drift over –40°C to +125°C - critical for unattended field instrumentation calibration stability. |
| Low 1/f noise | 320 nVPP (0.1–10 Hz) supports high-fidelity DC measurements in weigh scales and semiconductor parameter analyzers. |
| EMI rejection | 120 dB EMIRR at 100 MHz prevents RF-induced errors in noisy industrial environments near switching power supplies or motor drives. |
Applications
| Source Measurement Unit (SMU) | Weigh Scale |
|---|---|
Use Scenario: Precision sourcing and sinking of 100 nA–10 mA currents while simultaneously measuring voltage with <10 μV resolution. IC Role / Device Role / Timing Role: Front-end transimpedance amplifier and buffer driving 18-bit delta-sigma ADC; handles bidirectional current sensing with rail-to-rail output compliance. Use Value: 2 pA input bias current prevents error injection into feedback networks, enabling <0.001% current accuracy across 10-decade range. |
Use Scenario: Amplifying mV-level outputs from load cell bridges in commercial and industrial weighing platforms operating from –40°C to +85°C. IC Role / Device Role / Timing Role: Low-drift instrumentation amplifier stage with programmable gain; interfaces directly to 24-bit sigma-delta ADCs (e.g., ADS1232). Use Value: ±150 μV max offset and ±1 μV/°C drift ensure <0.005% full-scale error over temperature without factory recalibration. |
| Semiconductor Test Equipment | Data Acquisition (DAQ) |
Use Scenario: Biasing and measuring leakage currents in MOSFET gate oxides and diode junctions during wafer-level testing. IC Role / Device Role / Timing Role: Guarded low-current amplifier with guarded input terminals; operates in guarded chamber environments with <1 fA leakage targets. Use Value: 0.8 fA/√Hz current noise and 2 pA bias current enable reliable sub-picoampere measurements at 1 kHz bandwidth. |
Use Scenario: High-channel-count modular DAQ systems requiring low-power, high-accuracy analog front-ends for thermocouple, RTD, and voltage inputs. IC Role / Device Role / Timing Role: Programmable-gain amplifier (PGA) channel driver; multiplexed into 16-bit SAR ADCs with 100-kSPS aggregate throughput. Use Value: 5.5 MHz GBW and 20 V/μs slew rate support 12-bit settling in <1.6 μs, enabling time-interleaved sampling across 32 channels. |
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 GBW (11 MHz vs 5.5 MHz), higher IQ (1.2 mA vs 475 µA), same SOT-23-5 package and JFET input topology. | Better suited for higher-speed precision filtering (>100 kHz) but consumes >2.5× more power - unsuitable for battery-powered SMUs. | Select OPA141IDBVT only when bandwidth >8 MHz is required and power budget allows ≥1 mA per channel. |
| ADA4625-1ARMZ | Higher voltage noise (7.9 nV/√Hz vs 7 nV/√Hz), lower input bias current (0.6 pA vs 2 pA), SOIC-8 package (not pin-compatible). | Superior for ultra-high-Z photodiode amps where sub-picoampere bias dominates noise; requires PCB redesign due to different footprint and pinout. | Choose ADA4625-1ARMZ when bias current <1 pA is mandatory and board layout permits SOIC-8 rework. |
Compared with OPA145IDBVT, OPA141IDBVT trades power efficiency for speed, while ADA4625-1ARMZ prioritizes ultra-low bias current at the cost of higher noise and non-compatible packaging - making OPA145IDBVT the optimal balance for portable, low-power, high-precision sensor signal chains.
Availability
OPA145IDBVT 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 manufacturability and consistent parametric performance.
Supply support for OPA145IDBVT 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-impedance, low-noise sensor signal conditioning in metrology-grade instrumentation - emphasizing ultra-low drift, rail-to-rail output, and single-supply operability without performance compromise.
FAQ
What is the maximum capacitive load the OPA145IDBVT can drive without instability?
The OPA145IDBVT maintains stability with up to 100 pF capacitive load in unity-gain configuration, as confirmed by overshoot characterization in Figure 6-27 of the datasheet. For loads exceeding 100 pF, a series isolation resistor (e.g., 50 Ω) between the OPA145IDBVT output and the load is required to preserve phase margin and prevent peaking or oscillation.
Does the OPA145IDBVT support true single-supply operation down to 4.5 V?
Yes, the OPA145IDBVT is fully specified for single-supply operation from 4.5 V to 36 V. Its input common-mode range includes the negative rail (V–), and its rail-to-rail output swings within 75 mV of both rails under 10 kΩ load - enabling direct interface with 3.3 V or 5 V ADCs without level-shifting circuitry when powered from a single 5 V or higher supply.
How does the OPA145IDBVT's input bias current compare to other precision JFET op-amps?
The OPA145IDBVT specifies 2 pA typical input bias current - matching industry-leading JFET amplifiers like the OPA141 and ADA4625-1. This value is validated across temperature (–40°C to +125°C) and ensures minimal voltage error (<2 μV) when used with 1 MΩ feedback resistors, making it suitable for high-impedance sensor front-ends where bias current dominates total error.
Can the OPA145IDBVT be used in dual-supply configurations with ±2.25 V?
Yes, the OPA145IDBVT is fully characterized for dual-supply operation from ±2.25 V to ±18 V. At ±2.25 V, it maintains 5.5 MHz GBW and 20 V/μs slew rate while consuming only 445 µA typical quiescent current - enabling compact, low-voltage precision instrumentation designs such as handheld multimeters and portable oscilloscope front-ends.
What is the guaranteed offset voltage drift specification for OPA145IDBVT over temperature?
The OPA145IDBVT guarantees ±1.2 μV/°C maximum offset voltage drift over 0°C to +85°C and ±1.5 μV/°C over –40°C to +125°C for the SOT-23-5 (DBV) package, as specified in Section 6.6 of the SBOS427F datasheet. This drift performance is validated across production lots and ensures predictable calibration behavior in unattended field deployments.
OPA145IDBVT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- 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:
- SOT-23-5
OPA145IDBVT FAQ
1.How can I place an order for OPA145IDBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA145IDBVT 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 OPA145IDBVT reliable?
The price and inventory of OPA145IDBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA145IDBVT is usually 5 days.
3.What payment methods are accepted for OPA145IDBVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA145IDBVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA145IDBVT?
OPA145IDBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA145IDBVT 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 OPA145IDBVT?
For technical support, including OPA145IDBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA145IDBVT requirements.
6.How does Aetrix verify that OPA145IDBVT is sourced from the original manufacturer or authorized distributors?
All OPA145IDBVT 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 OPA145IDBVT meets industry standards.
7.What is the process for return or replacement of OPA145IDBVT?
All OPA145IDBVT units undergo pre-shipment inspection (PSI). If there is an issue with OPA145IDBVT, 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 OPA145IDBVT part is unused and in its original packaging.
Return procedure for OPA145IDBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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