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Texas Instruments OPA323IDCKR
- Part No.:
- OPA323IDCKR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
OPA323IDCKR.pdf
- Description:
- OP AMP
- Quantity:
- Payment:
- Shipping:
Inventory:2,865
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Product details
Overview
OPA323IDCKR from Texas Instruments is a single-channel, rail-to-rail input/output zero-crossover operational amplifier optimized for low-voltage (1.7 V to 5.5 V) precision signal conditioning. It delivers 20 MHz gain-bandwidth, 33 V/μs slew rate, ±150 µV typical input offset voltage, 100 dB CMRR, and 5.5 nV/√Hz input voltage noise at 10 kHz - enabling high-fidelity ADC driver and high-side current sensing in industrial motor control and audio preamplifier systems.
For engineers reviewing the OPA323IDCKR datasheet, OPA323IDCKR pinout, OPA323IDCKR application, or OPA323IDCKR equivalent, key selection criteria include its zero-crossover architecture for rail-to-rail linearity, fast 200 ns 0.01% settling time on 2 V step, ±110 mA output drive at 5.5 V, and operation across –40°C to 125°C ambient temperature.
Technical Context
The OPA323IDCKR implements a zero-crossover input stage that eliminates crossover distortion during rail-to-rail common-mode swing - critical for maintaining THD+N < 0.00125% in microphone preamplifiers and ADC drivers. Its unity-gain stable architecture supports direct connection to capacitive loads up to 150 pF without sustained oscillation.
Internally, it integrates RFI/EMI filtered input pins (62 dB rejection at 1.8 GHz), a Class-AB rail-to-rail output stage capable of sourcing/sinking ±110 mA, and thermal design validated for 196.7°C/W junction-to-ambient resistance in the SC70-5 package - ensuring robust performance in space-constrained, thermally demanding applications like rotary encoders and ultrasonic transducers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-bandwidth product | 20 MHz - enables stable unity-gain operation with ≤200 ns settling to 0.01% for 2 V step, supporting ADC sampling up to 5 MSPS. |
| Slew rate | 33 V/μs - allows rapid fault detection in high-side current sensing and preserves signal integrity in ultrasonic pulse amplification. |
| Input offset voltage | ±150 µV typical - ensures <1.25 mV max over temperature, critical for precision Wheatstone bridge and low-level sensor signal conditioning. |
| CMRR | 100 dB minimum at 5.5 V - rejects supply noise and common-mode interference in single-supply industrial interfaces. |
| Supply voltage range | 1.7 V to 5.5 V - supports direct integration into Li-ion, USB-powered, and automotive 3.3 V/5 V domains without level-shifting. |
| Quiescent current | 1.6 mA per channel - achieves high-speed performance while minimizing power in battery-operated portable instrumentation. |
| Input voltage noise | 5.5 nV/√Hz at 10 kHz - maintains SNR > 100 dB in audio microphone preamplifiers and photodiode transimpedance stages. |
Pinout & Package
The OPA323IDCKR is housed in a 5-pin SC70 (DCK) package measuring 2.0 mm × 1.25 mm, with exposed pad not present. Thermal resistance is 196.7°C/W (junction-to-ambient) and 44.8°C/W (junction-to-board), suitable for compact PCB layouts with moderate airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Noninverting input | Accepts rail-to-rail input signals from sensors or DACs; common-mode range extends 0.15 V beyond V+ and 0.2 V below V–. |
| IN– | Inverting input | Provides feedback path for closed-loop configurations; matched bias current (<20 pA) minimizes offset error in high-impedance sources. |
| OUT | Amplifier output | Drives 10 kΩ loads to within 25 mV of rails at 5.5 V; sustains ±110 mA short-circuit current without latch-up. |
| V– | Negative supply / ground | Reference node for single-supply operation; internal ESD diodes clamp inputs to this rail. |
| V+ | Positive supply | Accepts 1.7–5.5 V; requires 0.1 µF ceramic bypass capacitor placed adjacent to pin for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-crossover input stage | Eliminates distortion at signal zero-crossings during rail-to-rail input swing - essential for accurate ADC driver linearity and THD-sensitive audio paths. |
| Rail-to-rail input and output | Enables full utilization of supply voltage headroom in low-voltage systems (e.g., 1.8 V or 3.3 V), maximizing dynamic range without external level-shifting circuitry. |
| EMI/RFI filtered inputs | 62 dB rejection at 1.8 GHz prevents RF-induced errors in noisy industrial environments - verified per JEDEC JESD22-C101 CDM testing. |
| Fast 0.01% settling | 200 ns for 2 V step - meets timing budgets for 5 MSPS SAR ADCs and real-time motor position feedback loops. |
| High output current | ±110 mA at 5.5 V - directly drives low-impedance loads such as piezoelectric transducers or LED bias networks without external buffers. |
Applications
| Amplifier Driver for ADCs | High-Side Current Sensing |
|---|---|
Use Scenario: Driving the input of a 12-bit, 5 MSPS SAR ADC in an industrial PLC analog input module. IC Role / Device Role / Timing Role: Precision buffer and gain stage with rail-to-rail swing, zero-crossover linearity, and 200 ns 0.01% settling to meet ADC aperture uncertainty requirements. Use Value: Maintains ENOB > 11.5 bits by limiting THD+N to 0.00125% and preserving SNR via 5.5 nV/√Hz noise floor. | Use Scenario: Measuring bidirectional motor phase current in a 48 V BLDC inverter using a 1 mΩ shunt resistor. IC Role / Device Role / Timing Role: High-speed, high-CMRR difference amplifier with fast slew rate to capture transient overcurrent events before protection triggers. Use Value: Delivers 100 dB CMRR and 33 V/μs slew rate to resolve 100 mA steps in <1 µs, enabling cycle-by-cycle current limiting. |
| Motor Rotary Encoders | Transimpedance Photodiode Amplifiers |
Use Scenario: Conditioning sine/cosine outputs from a 10,000-line optical encoder in servo motor feedback. IC Role / Device Role / Timing Role: Low-noise, low-offset signal conditioner with 20 MHz bandwidth to preserve edge fidelity of quadrature signals up to 1 MHz. Use Value: ±150 µV offset and 2 μV/°C drift ensure position accuracy remains within ±0.05° over –40°C to 125°C ambient. | Use Scenario: Converting photocurrent from a 1 mm² silicon photodiode in a medical pulse oximeter front-end. IC Role / Device Role / Timing Role: Low-input-bias-current (±0.5 pA typ), low-noise transimpedance amplifier with rail-to-rail output swing. Use Value: 5.5 nV/√Hz noise and <1.25 mV max offset enable resolution of sub-nA photocurrents with >80 dB dynamic range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA320SAIDBVR | Lower 0.1 Hz–10 Hz noise (2.8 µVPP), lower input bias current (0.1 pA), but 10 MHz GBW and 10 V/μs slew rate. | Better for ultra-low-frequency sensor interfaces (e.g., strain gauges); insufficient speed for ≥3 MSPS ADC drivers or ultrasonic burst amplification. | Select OPA320SAIDBVR when DC precision and ultra-low frequency noise dominate; choose OPA323IDCKR when 20 MHz bandwidth and 33 V/μs slew are required. |
| LMV321IDBVR | Lower cost, 1 MHz GBW, 1 V/μs slew, 70 dB CMRR, 3.5 mV max offset - no zero-crossover architecture. | Suitable for non-critical general-purpose amplification (e.g., LED bias, simple filters); cannot maintain linearity across rail-to-rail input swing. | Choose LMV321IDBVR only for cost-sensitive, low-speed applications where distortion and settling time are non-critical. |
Compared with OPA320SAIDBVR and LMV321IDBVR, the OPA323IDCKR uniquely combines 20 MHz bandwidth, zero-crossover linearity, and 100 dB CMRR - making it the only option among the three capable of driving high-resolution, high-speed ADCs while maintaining sub-0.001% THD+N across full input swing.
Availability
OPA323IDCKR is available at Aetrix Electronics and suitable for industrial motor control, medical sensor signal conditioning, and portable audio equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for OPA323IDCKR 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 delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The OPAx323 family was designed specifically for precision, high-speed, low-voltage signal conditioning - targeting ADC drivers, current sensing, and audio preamplifiers where zero-crossover linearity, rail-to-rail operation, and low noise are mandatory.
FAQ
What is the maximum operating temperature range for the OPA323IDCKR?
The OPA323IDCKR operates across an ambient temperature range of –40°C to +125°C, validated per TI's recommended operating conditions and thermal characterization data. This rating applies to the DCK (SC70-5) package variant and supports deployment in under-hood automotive modules, industrial motor drives, and outdoor instrumentation without derating.
Does the OPA323IDCKR require external compensation for unity-gain stability?
No, the OPA323IDCKR is internally compensated for unity-gain stability and drives capacitive loads up to 150 pF without sustained oscillations. This eliminates the need for external compensation networks in standard gain-of-one configurations, simplifying layout and reducing bill-of-materials cost in ADC driver and buffer applications.
Can the OPA323IDCKR be used with a single 1.8 V supply?
Yes, the OPA323IDCKR supports operation from 1.7 V to 5.5 V supply rails. At 1.8 V, it maintains rail-to-rail input/output swing, 20 MHz gain-bandwidth, and 100 dB CMRR - enabling direct interface with low-voltage microcontrollers and energy-harvesting sensor nodes without level-shifting circuitry.
What is the input bias current specification for the OPA323IDCKR at 25°C?
The OPA323IDCKR exhibits ±0.5 pA typical input bias current at 25°C and 5.5 V supply, with a maximum of ±20 pA over temperature. This ultra-low bias current minimizes voltage error in high-impedance sensor interfaces such as photodiode transimpedance amplifiers and pH electrode buffers.
How does the zero-crossover input stage improve performance compared to conventional CMOS op amps?
The zero-crossover input stage in the OPA323IDCKR eliminates distortion artifacts that occur when input signals cross zero in traditional complementary-input-stage amplifiers. This results in THD+N < 0.00125% at 10 kHz and preserves linearity across the full rail-to-rail input common-mode range - a critical advantage for ADC drivers and audio preamplifiers where signal fidelity is paramount.
OPA323IDCKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Standard
- Number of Circuits:
- 1
- Output Type:
- Single Ended, Rail-to-Rail
- Slew Rate:
- 33V/µs
- Gain Bandwidth Product:
- 20 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.5 pA
- Voltage - Input Offset:
- 150 µV
- Current - Supply:
- 1.6mA
- Current - Output / Channel:
- 110 mA
- Voltage - Supply Span (Min):
- 1.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
OPA323IDCKR FAQ
1.How can I place an order for OPA323IDCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA323IDCKR 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 OPA323IDCKR reliable?
The price and inventory of OPA323IDCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA323IDCKR is usually 5 days.
3.What payment methods are accepted for OPA323IDCKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA323IDCKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA323IDCKR?
OPA323IDCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA323IDCKR 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 OPA323IDCKR?
For technical support, including OPA323IDCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA323IDCKR requirements.
6.How does Aetrix verify that OPA323IDCKR is sourced from the original manufacturer or authorized distributors?
All OPA323IDCKR 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 OPA323IDCKR meets industry standards.
7.What is the process for return or replacement of OPA323IDCKR?
All OPA323IDCKR units undergo pre-shipment inspection (PSI). If there is an issue with OPA323IDCKR, 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 OPA323IDCKR part is unused and in its original packaging.
Return procedure for OPA323IDCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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