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Texas Instruments OPA4325IPW
- Part No.:
- OPA4325IPW
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
OPA4325IPW.pdf
- Description:
- IC CMOS 4 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:799
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Product details
Overview
OPA4325IPW from Texas Instruments is a quad-channel, precision rail-to-rail input/output CMOS operational amplifier optimized for low-noise (9 nV/√Hz at 10 kHz), wide bandwidth (10 MHz), and low quiescent current (650 µA per channel), serving as an ADC input driver in battery-powered data acquisition systems.
For engineers reviewing the OPA4325IPW datasheet, OPA4325IPW pinout, OPA4325IPW application, or OPA4325IPW equivalent, key selection criteria include zero-crossover distortion performance, ±150 µV max input offset voltage, 114 dB CMRR, rail-to-rail I/O swing within 10 mV of rails, and TSSOP-14 package compatibility with high-density PCB layouts.
Technical Context
The OPA4325IPW employs an internal charge pump to bias a single differential input pair across the full common-mode range (V– – 0.1 V to V+ + 0.1 V), eliminating crossover distortion and enabling stable 114 dB CMRR over temperature and supply voltage. Its e-trim™ process ensures ≤150 µV max input offset voltage with 2–7.5 µV/°C drift.
It delivers 5 V/µs slew rate, 0.6 µs settling time to 0.1%, and unity-gain stability into 15 pF loads - characteristics validated for driving SAR ADCs with 16-bit+ resolution while operating from 2.2 V to 5.5 V single supply or ±1.1 V to ±2.75 V dual supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth | 10 MHz gain-bandwidth product - supports stable closed-loop operation up to 10× gain with minimal phase margin degradation. |
| Input Offset Voltage | ≤150 µV maximum - enables direct interfacing with high-resolution (≥16-bit) SAR ADCs without calibration. |
| CMRR | 114 dB typical - maintains signal integrity when amplifying small differential signals in noisy industrial environments. |
| Quiescent Current | 650 µA per channel - allows four independent precision channels in ultra-low-power portable instrumentation. |
| Input Bias Current | ±0.2 pA typical - preserves accuracy in high-impedance sensor interfaces (e.g., pH electrodes, photodiodes). |
| Output Swing | Within 10 mV of rails (RL = 10 kΩ) - maximizes dynamic range when driving ADCs referenced to same supply rails. |
| Supply Range | 2.2 V to 5.5 V single supply - eliminates need for LDO regulation in coin-cell or Li-ion powered designs. |
Pinout & Package
TSSOP-14 package (5.00 mm × 4.40 mm body size), thermally enhanced for 4-channel operation in space-constrained applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7, 8, 14 | OUT A / OUT B / OUT C / OUT D | Amplifier output terminals - each drives independent load; rail-to-rail swing supports full-scale ADC input utilization. |
| 2, 6, 9, 13 | –IN A / –IN B / –IN C / –IN D | Inverting inputs - matched with +IN pins for precision differential gain configurations. |
| 3, 5, 10, 12 | +IN A / +IN B / +IN C / +IN D | Noninverting inputs - support zero-crossover linear operation from V– – 0.1 V to V+ + 0.1 V. |
| 4 | V+ | Positive supply terminal - accepts 2.2 V to 5.5 V single supply or highest rail in dual-supply mode. |
| 11 | V– | Negative supply terminal - connects to ground (single supply) or negative rail (dual supply); enables true rail-to-rail input. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-crossover input stage | Eliminates CMRR degradation at rail transitions - ensures consistent 114 dB rejection across full input common-mode range. |
| e-trim™ offset calibration | Guarantees ≤150 µV max VOS without external trimming - reduces system-level calibration overhead in production test. |
| Rail-to-rail I/O | Input extends 100 mV beyond supplies; output swings within 10 mV of rails - maximizes usable signal range in low-voltage systems. |
| Low-noise architecture | 9 nV/√Hz at 10 kHz - preserves SNR in front-end amplification of microvolt-level sensor outputs. |
| Unity-gain stable | Drives capacitive loads up to 15 pF without oscillation - simplifies anti-aliasing filter design directly at ADC input. |
Applications
| High-Z Sensor Signal Conditioning | ADC Input Driver |
|---|---|
|
Use Scenario: Amplifying output of piezoresistive pressure sensors or pH electrodes with source impedances >1 MΩ. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with ultra-low input bias current (±0.2 pA) and zero-crossover linearity. Use Value: Prevents signal attenuation and offset drift caused by leakage paths - maintains measurement accuracy over temperature and time. |
Use Scenario: Driving 16-bit SAR ADC inputs in portable data loggers powered by 3.3 V Li-ion batteries. IC Role / Device Role / Timing Role: Low-noise, fast-settling (0.6 µs to 0.1%) buffer between signal source and ADC sampling aperture. Use Value: Enables full-resolution digitization without missing codes - critical for achieving specified ENOB in battery-operated instruments. |
| Programmable Logic Controller (PLC) Analog Input Module | Active Filter Stage |
|
Use Scenario: Multiplexed analog input conditioning in industrial PLCs requiring 12–16-bit accuracy across –40°C to +85°C. IC Role / Device Role / Timing Role: Quad-channel signal conditioner handling four simultaneous 4–20 mA loop receivers or thermocouple inputs. Use Value: Single-package integration reduces board area and component count - improves thermal tracking and long-term stability in harsh environments. |
Use Scenario: Second-order Sallen-Key low-pass filtering prior to ADC sampling in medical ECG front-ends. IC Role / Device Role / Timing Role: High-precision, low-distortion (0.0005% THD+N) active filter amplifier with 10 MHz bandwidth headroom. Use Value: Maintains passband flatness and phase linearity - avoids aliasing and preserves diagnostic waveform fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4188IPW | Lower offset (25 µV max), higher IQ (430 µA/ch), no zero-crossover architecture - exhibits CMRR rolloff near rails. | Better DC precision but reduced AC linearity at rail extremes - less suitable for rail-to-rail input SAR ADC drivers. | Select when ultra-low offset dominates over wide common-mode linearity; verify CMRR vs VCM in final design. |
| ADA4522-4ARUZ | Zero-drift architecture, 2.5 µV max VOS, 1.2 mA/ch IQ, 3 MHz GBW - superior DC stability but lower bandwidth. | Optimized for µV-level DC measurements (e.g., strain gauges), not high-speed ADC buffering. | Prefer for sub-100 kHz applications demanding nanovolt-level drift; avoid where 10 MHz bandwidth or fast settling is required. |
Compared with OPA4188IPW and ADA4522-4ARUZ, the OPA4325IPW uniquely balances 10 MHz bandwidth, zero-crossover linearity, and 650 µA/ch power - making it the only quad op-amp in this group qualified for precision, low-power, high-speed ADC interface roles.
Availability
OPA4325IPW is available at Aetrix Electronics and suitable for high-precision data acquisition, portable instrumentation, and industrial analog input modules requiring stable component supply across extended temperature ranges (–40°C to +125°C).
Supply support for OPA4325IPW 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 interfaces.
The OPAx325 family was engineered specifically for high-fidelity signal conditioning in battery-powered, high-resolution data acquisition systems - emphasizing zero-crossover linearity, low noise, and rail-to-rail operation without sacrificing speed or power efficiency.
FAQ
What is the maximum supply voltage for the OPA4325IPW?
The OPA4325IPW 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 defined in the Absolute Maximum Ratings table. Operation at 5.5 V enables full output swing and optimal PSRR performance across the specified temperature range.
Does the OPA4325IPW require external compensation for unity-gain stability?
No, the OPA4325IPW is internally compensated for unity-gain stability and drives capacitive loads up to 15 pF without oscillation. This eliminates the need for external compensation networks in standard buffer or gain-of-one configurations, simplifying layout and reducing bill-of-materials cost.
How does the zero-crossover architecture of the OPA4325IPW improve CMRR performance?
The OPA4325IPW uses an internal charge pump to power a single differential input pair, avoiding the rail-transition region where traditional CMOS amplifiers exhibit abrupt offset shifts. This results in stable 114 dB CMRR across the entire input common-mode range - including 100 mV beyond both supply rails - unlike conventional rail-to-rail op-amps.
Can the OPA4325IPW drive a 600 Ω load at 10 kHz without significant THD+N degradation?
Yes - the OPA4325IPW achieves 0.005% THD+N at 10 kHz with 2 VPP output into 600 Ω, verified per the Electrical Characteristics table. Its 5 V/µs slew rate and low distortion ensure fidelity in audio and communication signal chains where harmonic content must remain below –86 dBc.
What is the thermal resistance (RθJA) of the OPA4325IPW in its TSSOP-14 package?
The OPA4325IPW in the PW (TSSOP-14) package has a junction-to-ambient thermal resistance (RθJA) of 93 °C/W, as specified in Section 6.6 of the datasheet. This value assumes standard JEDEC 2-layer board conditions and informs thermal design margins for continuous operation at maximum ambient temperatures.
OPA4325IPW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- CMOS
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 5V/µs
- Gain Bandwidth Product:
- 10 MHz
- -3db Bandwidth:
- 80 kHz
- Current - Input Bias:
- 0.2 pA
- Voltage - Input Offset:
- 40 µV
- Current - Supply:
- 650µA (x4 Channels)
- Current - Output / Channel:
- -
- 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:
- 14-TSSOP
OPA4325IPW FAQ
1.How can I place an order for OPA4325IPW through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4325IPW 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 OPA4325IPW reliable?
The price and inventory of OPA4325IPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4325IPW is usually 5 days.
3.What payment methods are accepted for OPA4325IPW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4325IPW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4325IPW?
OPA4325IPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4325IPW 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 OPA4325IPW?
For technical support, including OPA4325IPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4325IPW requirements.
6.How does Aetrix verify that OPA4325IPW is sourced from the original manufacturer or authorized distributors?
All OPA4325IPW 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 OPA4325IPW meets industry standards.
7.What is the process for return or replacement of OPA4325IPW?
All OPA4325IPW units undergo pre-shipment inspection (PSI). If there is an issue with OPA4325IPW, 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 OPA4325IPW part is unused and in its original packaging.
Return procedure for OPA4325IPW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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