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Texas Instruments OPA2320AID
- Part No.:
- OPA2320AID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2320AID.pdf
- Description:
- IC CMOS 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,547
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Product details
Overview
OPA2320AID from Texas Instruments is a dual-channel, precision rail-to-rail input/output CMOS operational amplifier optimized for low-noise (7 nV/√Hz at 10 kHz), high-speed (20-MHz GBW), and ultra-low input bias current (0.9 pA max) operation on single supplies from 1.8 V to 5.5 V. It delivers 10 V/µs slew rate, 150 µV max offset voltage, and 114 dB CMRR - ideal for high-impedance sensor signal conditioning and transimpedance amplifier stages in battery-powered test equipment.
For engineers reviewing the OPA2320AID datasheet, OPA2320AID pinout, OPA2320AID application, or OPA2320AID equivalent, this page provides verified technical context, package-specific pin functions, real-world application mappings, and two validated alternative parts with documented functional and application-level differences - all grounded in TI's SBOS513F production data sheet.
Technical Context
The OPA2320AID implements a linear input stage with zero-crossover distortion architecture, enabling stable common-mode rejection (114 dB typ) across the full rail-to-rail input range - extending 100 mV beyond both supply rails. Its CMOS input stage achieves 0.9 pA max input bias current at 25°C, critical for photodiode and piezoelectric sensor interfaces where leakage dominates error budgets.
It features unity-gain stability with 20-MHz gain-bandwidth product and 10 V/µs slew rate, supporting fast settling (0.32 µs to 0.01%) into 10-kΩ loads. PSRR remains excellent (106 dB) across 1.8–5.5 V supply range, making it suitable for direct battery operation without regulation in portable instrumentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 20 MHz - supports stable closed-loop gain ≥1 with bandwidth up to 20 MHz for ADC driver or active filter use. |
| Input Bias Current | 0.9 pA (max) - enables accurate amplification of picoamp-level currents from high-Z sensors without significant DC error. |
| Input Voltage Noise | 7 nV/√Hz at 10 kHz - low enough to preserve SNR in 16-bit ADC front-ends with bandwidths up to ~100 kHz. |
| CMRR | 114 dB (typ) - maintains accuracy when amplifying small differential signals in presence of large common-mode noise (e.g., motor control feedback). |
| Supply Range | 1.8 V to 5.5 V - allows direct operation from Li-ion (3.0–4.2 V), coin cell (3 V), or regulated 3.3 V/5 V rails without LDO overhead. |
| Quiescent Current | 1.45 mA per channel - balances speed and power for always-on sensor nodes requiring sub-3-mA total analog front-end current. |
| Output Swing | Within 10 mV of rails (RL = 10 kΩ) - maximizes dynamic range in single-supply systems with limited headroom. |
Pinout & Package
OPA2320AID is packaged in an 8-pin SOIC (D package) with body size 4.90 mm × 3.91 mm and exposed pad not present. Pin functions are electrically isolated per channel and fully specified in TI's SBOS513F datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: OUT A | Output, Channel A | Low-impedance buffered output capable of driving 10-kΩ loads within 10 mV of rails; requires no external compensation for unity-gain stability. |
| 2: –IN A | Inverting Input, Channel A | High-impedance CMOS node; connects to feedback network in inverting configurations or to sensor reference in transimpedance setups. |
| 3: +IN A | Noninverting Input, Channel A | High-impedance CMOS node; accepts rail-to-rail common-mode signals up to 100 mV beyond V+ and V− for maximum input flexibility. |
| 4: V− | Negative Supply Rail | Reference ground for dual-supply operation or system ground in single-supply designs; thermal pad (if present) must be connected here. |
| 5: V+ | Positive Supply Rail | Primary power connection; supports 1.8–5.5 V; PSRR of 106 dB ensures immunity to supply ripple in noisy environments. |
| 6: –IN B | Inverting Input, Channel B | Independent high-Z input for second signal path; identical electrical specs to Channel A - enables dual-sensor or differential pair buffering. |
| 7: OUT B | Output, Channel B | Independent output with same drive capability and rail-swing as OUT A; no crosstalk degradation above 100 dB at 1 kHz. |
| 8: +IN B | Noninverting Input, Channel B | Second independent high-Z input; supports simultaneous dual-channel acquisition without shared reference errors. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-Rail Input/Output | Input common-mode range extends 100 mV beyond V− and V+; output swings within 10 mV of both rails - preserves full signal swing in low-voltage systems. |
| Zero-Crossover Distortion | Eliminates crossover-induced nonlinearity in Class AB input stages, ensuring THD+N ≤ 0.0005% at 10 kHz - critical for precision DAC/ADC buffering. |
| Ultra-Low Input Bias Current | 0.9 pA max at 25°C - reduces voltage error across high-value feedback resistors (e.g., 1 GΩ in photodiode amps) to <1 µV. |
| Low 1/f Noise | 2.8 µVPP integrated 0.1–10 Hz - minimizes drift and baseline wander in DC-coupled sensor interfaces like strain gauge bridges. |
| High PSRR & CMRR | 106 dB PSRR and 114 dB CMRR over full temperature range - rejects supply noise and common-mode interference without external filtering. |
Applications
| High-Z Sensor Signal Conditioning | Transimpedance Amplifier |
|---|---|
Use Scenario: Amplifying microvolt-level outputs from pH electrodes, thermopiles, or capacitive humidity sensors with source impedances >100 MΩ. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with ultra-low IB and rail-to-rail I/O to maximize dynamic range. Use Value: 0.9 pA input bias ensures <10 µV error across 10-GΩ sensor impedance; 150 µV max VOS avoids calibration drift in field-deployed instruments. |
Use Scenario: Converting photocurrent from avalanche photodiodes (APDs) or photomultiplier tubes (PMTs) into measurable voltage with minimal noise addition. IC Role / Device Role / Timing Role: Low-noise, high-speed current-to-voltage converter with 7 nV/√Hz noise density and 20-MHz bandwidth. Use Value: Enables detection of sub-picoamp signals at >100 kHz bandwidth while maintaining SNR >86 dB for 16-bit digitization. |
| Programmable Logic Controller (PLC) Analog Input Module | Input/Output ADC/DAC Buffer |
Use Scenario: Front-end signal conditioning for 4–20 mA loop receivers and RTD/thermocouple inputs in industrial automation cabinets. IC Role / Device Role / Timing Role: High-CMRR (114 dB), rail-to-rail I/O amplifier isolating field-side signals from noisy digital backplanes. Use Value: 114 dB CMRR rejects common-mode noise from motor drives and solenoids; 1.8–5.5 V supply range simplifies power architecture across modular I/O cards. |
Use Scenario: Isolating precision DAC outputs or driving SAR ADC sample-and-hold inputs in data acquisition systems. IC Role / Device Role / Timing Role: Unity-gain stable buffer with 10 V/µs slew rate and 0.32 µs settling to 0.01% - prevents acquisition errors during fast sampling. Use Value: Eliminates missing codes in 16-bit ADCs by reducing settling tail; rail-to-rail output ensures full-scale utilization of ADC reference range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2182AIDR | Lower offset (±4 µV max), higher PSRR (140 dB), but higher quiescent current (550 µA/ch) and narrower supply (4.5–36 V). | Preferred for high-precision, wide-supply industrial sensors; unsuitable for 1.8–3.3 V battery operation. | Select OPA2182AIDR only when sub-5-µV offset and >130 dB PSRR outweigh power and voltage-range constraints. |
| ADA4522-2ARMZ | Zero-drift architecture (0.005 µV/°C drift), lower noise (5.8 nV/√Hz), but slower GBW (3 MHz) and higher IQ (420 µA/ch). | Better for DC-stable, low-drift applications (e.g., weigh scales); insufficient bandwidth for >100-kHz ADC drivers. | Choose ADA4522-2ARMZ when long-term DC stability dominates over speed; avoid when >5-MHz closed-loop bandwidth is required. |
Compared with OPA2320AID, OPA2182AIDR trades ultra-low IB and wide supply for superior DC precision and PSRR, while ADA4522-2ARMZ sacrifices bandwidth and supply flexibility to achieve near-zero drift - making OPA2320AID the optimal balance for high-speed, low-power, high-Z sensor interfaces.
Availability
OPA2320AID is available at Aetrix Electronics and suitable for high-impedance sensor signal conditioning, transimpedance amplifier design, and PLC analog input modules requiring stable component supply, consistent parametric performance, and long-term manufacturability assurance.
Supply support for OPA2320AID 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 OPA2320AID belongs to TI's OPAx320 precision op amp family, engineered specifically for low-noise, low-input-bias-current, rail-to-rail operation in battery-powered and high-impedance measurement systems - targeting test equipment, industrial sensors, and portable medical devices.
FAQ
What is the maximum input bias current specification for OPA2320AID at 25°C?
The maximum input bias current for OPA2320AID at 25°C is 0.9 pA, as specified in the Electrical Characteristics table of TI's SBOS513F datasheet. This ultra-low value is critical for minimizing error in high-impedance applications such as photodiode amplification or pH electrode conditioning. The OPA2320AID maintains this performance across its full operating temperature range, with typical values remaining below 0.2 pA at room temperature.
Does OPA2320AID support true rail-to-rail input and output operation?
Yes, OPA2320AID supports true rail-to-rail input and output operation. Its input common-mode range extends 100 mV beyond both V− and V+ rails, and its output swings within 10 mV of each rail under 10-kΩ load conditions. This capability is explicitly confirmed in the "Description" and "Electrical Characteristics" sections of the SBOS513F datasheet, enabling full utilization of supply voltage headroom in low-voltage systems like 3.3 V or 1.8 V designs.
What package type is used for OPA2320AID, and what are its key mechanical dimensions?
OPA2320AID uses the SOIC-8 (D) package with nominal body dimensions of 4.90 mm × 3.91 mm and standard 1.27-mm lead pitch. This package is listed in TI's Device Information table and confirmed in the "Mechanical, Packaging, and Orderable Information" section of SBOS513F. It does not include an exposed thermal pad, distinguishing it from the SON-8 variant (OPA2320DRG).
Can OPA2320AID drive capacitive loads, and what is its recommended maximum?
OPA2320AID can drive moderate capacitive loads, with stability maintained up to 50 pF when configured in unity gain, as shown in Figure 20 of the SBOS513F datasheet. For loads exceeding 50 pF, external isolation resistance (e.g., 10–50 Ω in series with the output) is recommended to prevent peaking or oscillation. The device's 20-MHz GBW and 10 V/µs slew rate make it sensitive to excessive capacitance without proper compensation.
What is the quiescent current per channel for OPA2320AID at 5.5 V supply?
The quiescent current per channel for OPA2320AID is 1.45 mA (typical) and 1.6 mA (maximum) at 5.5 V supply and 25°C, per the "Electrical Characteristics" table in SBOS513F. This value increases slightly over temperature, reaching 1.7 mA (max) at –40°C to 125°C. The dual-channel architecture ensures consistent per-channel consumption without interaction between channels.
OPA2320AID 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:
- CMOS
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 10V/µs
- Gain Bandwidth Product:
- 20 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.2 pA
- Voltage - Input Offset:
- 40 µV
- Current - Supply:
- 1.45mA
- Current - Output / Channel:
- 65 mA
- Voltage - Supply Span (Min):
- 1.8 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA2320AID FAQ
1.How can I place an order for OPA2320AID through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2320AID 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 OPA2320AID reliable?
The price and inventory of OPA2320AID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2320AID is usually 5 days.
3.What payment methods are accepted for OPA2320AID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2320AID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2320AID?
OPA2320AID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2320AID 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 OPA2320AID?
For technical support, including OPA2320AID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2320AID requirements.
6.How does Aetrix verify that OPA2320AID is sourced from the original manufacturer or authorized distributors?
All OPA2320AID 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 OPA2320AID meets industry standards.
7.What is the process for return or replacement of OPA2320AID?
All OPA2320AID units undergo pre-shipment inspection (PSI). If there is an issue with OPA2320AID, 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 OPA2320AID part is unused and in its original packaging.
Return procedure for OPA2320AID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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