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Texas Instruments OPA325IDBVT
- Part No.:
- OPA325IDBVT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA325IDBVT.pdf
- Description:
- IC CMOS 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:8,890
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Product details
Overview
OPA325IDBVT from Texas Instruments is a precision single-channel CMOS operational amplifier optimized as an ADC input driver, featuring 10-MHz bandwidth, 5 V/µs slew rate, 9 nV/√Hz input voltage noise at 10 kHz, rail-to-rail I/O, and ±150 µV maximum input offset voltage. It operates from 2.2 V to 5.5 V single supply and delivers stable performance in high-resolution SAR ADC front-ends for battery-powered instrumentation.
For engineers reviewing the OPA325IDBVT datasheet, OPA325IDBVT pinout, OPA325IDBVT application, or OPA325IDBVT equivalent, key selection criteria include zero-crossover distortion architecture, 114 dB CMRR over full common-mode range, 650 µA quiescent current per channel, and SOT-23-5 package compatibility with space-constrained signal chains.
Technical Context
The OPA325IDBVT employs a proprietary zero-crossover input stage using an internal charge pump to bias a single differential pair-eliminating the offset discontinuity and CMRR degradation typical of dual-pair rail-to-rail CMOS amplifiers. This architecture enables linear operation across VCM = (V–) – 0.1 V to (V+) + 0.1 V.
It achieves 10-MHz unity-gain bandwidth and 5 V/µs slew rate while maintaining 9 nV/√Hz noise at 10 kHz and 0.2 pA typical input bias current. The device is unity-gain stable and supports capacitive loads up to 15 pF without oscillation under specified conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth | 10 MHz - supports accurate gain and phase response up to 10 MHz in unity-gain configuration for fast-settling ADC drivers. |
| Slew Rate | 5 V/µs - enables full-scale step response within 0.6 µs (to 0.1%) for 2-V inputs, critical for SAR ADC sampling fidelity. |
| Input Offset Voltage | ≤150 µV max - ensures ≤0.0024% error at 6.5 V full-scale, preserving 16-bit+ DC accuracy in precision measurement paths. |
| CMRR | 114 dB typ - maintains high rejection of supply- and reference-related common-mode interference across full input range. |
| Quiescent Current | 650 µA/ch - allows continuous operation from coin-cell or energy-harvesting sources without compromising speed or noise. |
| Input Voltage Noise | 9 nV/√Hz @ 10 kHz - contributes <1.8 µV RMS integrated noise (0.1 Hz–100 kHz), suitable for low-level sensor interfaces. |
| Rail-to-Rail I/O | VCM extends 100 mV beyond rails; VOUT swings to within 10 mV of rails - maximizes dynamic range in low-voltage, single-supply systems. |
Pinout & Package
OPA325IDBVT is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Output | Amplified, buffered output node; capable of sourcing/sinking ≥10 mA and swinging within 10 mV of either rail under 10-kΩ load. |
| 2 - V– | Negative Supply | Lowest potential power terminal; accepts ground or negative rail; input common-mode extends 100 mV below this pin. |
| 3 - +IN | Noninverting Input | High-impedance (≥10¹³ Ω), low-bias (±0.2 pA typ) input; connects to sensor, reference, or DAC output in precision configurations. |
| 4 - –IN | Inverting Input | Differential input node; used with feedback network to set closed-loop gain; matched to +IN for optimal CMRR. |
| 5 - V+ | Positive Supply | Highest potential power terminal; supports 2.2 V to 5.5 V single supply or ±1.1 V to ±2.75 V dual supply; PSRR >100 dB. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-crossover input stage | Eliminates offset discontinuity at rail transitions, enabling consistent 114 dB CMRR across full VCM range (V– –0.1 V to V+ +0.1 V). |
| e-trim™ technology | Factory-trimmed input offset (≤150 µV max) and drift (≤7.5 µV/°C) ensure stable DC accuracy without external calibration. |
| Rail-to-rail output swing | Drives to within 10 mV of V+ or V– with 10-kΩ load, preserving >99.5% of available voltage headroom in 3.3-V systems. |
| Low-noise, low-power balance | 9 nV/√Hz noise at 10 kHz with only 650 µA supply current-enables high-fidelity amplification in always-on portable sensors. |
| Unity-gain stability | Operates stably with no external compensation in G = +1, –1, or follower configurations-reduces BOM count and layout complexity. |
Applications
| High-Z Sensor Signal Conditioning | ADC Input Driver (SAR) |
|---|---|
Use Scenario: Amplifying microamp-level currents from photodiodes or piezoelectric sensors with minimal loading. IC Role / Device Role / Timing Role: Transimpedance amplifier with ultra-low input bias current (0.2 pA) and high open-loop gain (130 dB). Use Value: Preserves signal integrity by avoiding input current errors that would otherwise dominate low-current measurements. |
Use Scenario: Driving the switched-capacitor input of a 16-bit+ SAR ADC in data acquisition systems. IC Role / Device Role / Timing Role: Precision buffer with 0.6 µs 0.1% settling time and zero-crossover linearity to prevent code-dependent distortion. Use Value: Enables full-speed sampling without missing codes or harmonic distortion, even at full-scale input steps. |
| Programmable Logic Controller (PLC) Analog Input | Active Filter Stage |
Use Scenario: Conditioning industrial 4–20 mA or ±10 V sensor signals in harsh, noisy factory environments. IC Role / Device Role / Timing Role: Precision gain/level-shift stage with 114 dB CMRR and >100 dB PSRR to reject common-mode noise and supply ripple. Use Value: Maintains 16-bit effective resolution despite EMI, ground shifts, and unregulated 24-V bus fluctuations. |
Use Scenario: Implementing 2nd-order low-pass or band-pass filters in medical or test equipment signal chains. IC Role / Device Role / Timing Role: High-linearity, low-noise active element with 10-MHz GBP and 5 V/µs slew rate for clean frequency-domain shaping. Use Value: Delivers flat passband response and steep roll-off without phase reversal or peaking near cutoff. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA333AIDBVR | Lower quiescent current (17 µA) but reduced bandwidth (350 kHz), no zero-crossover architecture, 12 µV max VOS. | Better for ultra-low-power DC sensing; unsuitable for >100-kHz signal conditioning or SAR ADC driving. | Select when nanowatt operation outweighs speed/noise requirements-e.g., battery-life-critical IoT nodes. |
| ADA4522-1ARMZ | Zero-drift architecture, 2.5 µV max VOS, 3.6 MHz GBW, higher supply current (1.2 mA), SOIC-8 only. | Superior DC accuracy and long-term drift stability; less suitable for wideband, low-noise AC-coupled paths. | Prefer for precision weigh scales or strain-gauge bridges where sub-µV offset and <0.005 µV/°C drift dominate. |
Compared with OPA325IDBVT, OPA333AIDBVR trades bandwidth and linearity for extreme low-power operation, while ADA4522-1ARMZ prioritizes ultra-low drift and offset at the expense of speed and quiescent current-making OPA325IDBVT the balanced choice for high-fidelity, medium-speed, battery-compatible signal chains.
Availability
OPA325IDBVT is available at Aetrix Electronics and suitable for high-resolution data acquisition, portable instrumentation, and industrial analog I/O modules requiring stable component supply and guaranteed long-term manufacturability.
Supply support for OPA325IDBVT 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 data converter ecosystems.
The OPAx325 family was engineered specifically for high-speed, low-noise, low-power precision signal conditioning-targeting SAR ADC front-ends, portable test equipment, and industrial PLC analog input stages where zero-crossover linearity and rail-to-rail operation are essential.
FAQ
What is the maximum supply voltage for OPA325IDBVT?
The OPA325IDBVT supports a maximum single-supply voltage of 5.5 V or dual-supply rails of ±2.75 V. Exceeding these limits risks permanent damage, as specified in the Absolute Maximum Ratings table. Operation above 5.5 V violates the device's internal charge pump design margin and may degrade zero-crossover performance or cause latch-up.
Does OPA325IDBVT require external compensation for unity-gain stability?
No, the OPA325IDBVT is internally compensated and unity-gain stable. It drives capacitive loads up to 15 pF without oscillation in G = +1 configuration, as verified in the Typical Characteristics section (Figure 27). External compensation is unnecessary unless driving heavier loads (>50 pF), where a small series resistor at the output is recommended.
How does the zero-crossover architecture improve OPA325IDBVT performance versus standard RRIO op-amps?
The OPA325IDBVT uses an internal charge pump to power a single-input differential pair, eliminating the offset discontinuity seen in conventional complementary-input CMOS op-amps. This delivers consistent 114 dB CMRR across the full input common-mode range (V– –0.1 V to V+ +0.1 V), unlike traditional RRIO parts that exhibit >20 dB CMRR degradation near supply rails.
Can OPA325IDBVT operate from a 1.8-V supply?
No-the minimum recommended single-supply voltage for OPA325IDBVT is 2.2 V. At 1.8 V, the internal charge pump cannot sustain proper biasing of the zero-crossover input stage, leading to degraded CMRR, increased offset, and potential loss of rail-to-rail input capability. TI specifies 2.2 V as the functional lower limit across temperature.
What is the thermal resistance (RθJA) of the OPA325IDBVT in its SOT-23-5 package?
The junction-to-ambient thermal resistance (RθJA) for OPA325IDBVT in the DBV (SOT-23-5) package is 205 °C/W, as measured on a standard JEDEC 2-layer board. This value assumes no copper pour or thermal vias; adding 1-in² copper area beneath the pad reduces RθJA to approximately 113 °C/W (RθJB), significantly improving power dissipation capability.
OPA325IDBVT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- CMOS
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 5V/µs
- Gain Bandwidth Product:
- 10 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.2 pA
- Voltage - Input Offset:
- 40 µV
- Current - Supply:
- 650µA
- Current - Output / Channel:
- 30 mA
- Voltage - Supply Span (Min):
- 2.2 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
OPA325IDBVT FAQ
1.How can I place an order for OPA325IDBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA325IDBVT 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 OPA325IDBVT reliable?
The price and inventory of OPA325IDBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA325IDBVT is usually 5 days.
3.What payment methods are accepted for OPA325IDBVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA325IDBVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA325IDBVT?
OPA325IDBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA325IDBVT 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 OPA325IDBVT?
For technical support, including OPA325IDBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA325IDBVT requirements.
6.How does Aetrix verify that OPA325IDBVT is sourced from the original manufacturer or authorized distributors?
All OPA325IDBVT 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 OPA325IDBVT meets industry standards.
7.What is the process for return or replacement of OPA325IDBVT?
All OPA325IDBVT units undergo pre-shipment inspection (PSI). If there is an issue with OPA325IDBVT, 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 OPA325IDBVT part is unused and in its original packaging.
Return procedure for OPA325IDBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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