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Texas Instruments OPA365AIDG4
- Part No.:
- OPA365AIDG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA365AIDG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,198
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Product details
Overview
OPA365AIDG4 from Texas Instruments is a single-channel, rail-to-rail input/output CMOS operational amplifier optimized for high-speed, low-distortion signal conditioning in single-supply systems. It delivers 50-MHz gain bandwidth, 25-V/µs slew rate, and 0.0004% THD+N at 1 kHz - enabling precision driving of SAR and sigma-delta ADCs with full-scale 0–5 V inputs. Its 100-mV beyond-rail input range and 10-mV-from-rail output swing support wide dynamic range in battery-powered data acquisition and sensor front-ends.
For engineers reviewing the OPA365AIDG4 datasheet, OPA365AIDG4 pinout, OPA365AIDG4 application, or OPA365AIDG4 equivalent, key selection criteria include zero-crossover distortion topology, CMRR ≥100 dB over −40°C to +125°C, 4.5-nV/√Hz noise at 100 kHz, 100-µV max offset, and stable operation from 2.2 V to 5.5 V - all verified for SOIC-8 packaging per TI SBOS365G.
Technical Context
The OPA365AIDG4 implements a proprietary zerø-crossover input stage that eliminates transition-region distortion common in complementary-input rail-to-rail op amps, ensuring linear THD+N across the full ±1.1 V to ±2.75 V supply range. Its regulated charge-pump internal biasing enables consistent 50-MHz GBW and 25-V/µs slew rate independent of supply voltage within spec.
This architecture supports true rail-to-rail input (VCM = V− − 0.1 V to V+ + 0.1 V) and rail-to-rail output (10 mV from rails at 10-kΩ load), with CMRR maintained at ≥100 dB up to 100 kHz and PSRR >100 dB at DC - critical for rejecting supply noise in mixed-signal data paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth | 50 MHz - enables stable unity-gain buffer operation up to 25 MHz and closed-loop filtering at ≥25 kHz without phase-margin collapse. |
| Slew Rate | 25 V/µs - supports clean 4-V step response in ≤300 ns (0.01% settling), essential for fast ADC driver settling. |
| THD+N | 0.0004% at 1 kHz - ensures <12-bit SFDR in audio and sensor signal chains without harmonic contamination. |
| Input Offset Voltage | 100 µV max - reduces DC error to <0.002% of 5-V full-scale, minimizing calibration burden in precision instrumentation. |
| CMRR | 100 dB min (−40°C to +125°C) - rejects common-mode interference from shared PCB traces or noisy digital supplies. |
| Supply Range | 2.2 V to 5.5 V - operates from single Li-ion cell (3.0–3.7 V) or regulated 3.3-V/5-V rails without level-shifting. |
| Input Voltage Range | V− − 0.1 V to V+ + 0.1 V - accepts signals beyond supply rails, simplifying anti-aliasing filter design and sensor biasing. |
Pinout & Package
OPA365AIDG4 is packaged in an 8-pin SOIC (D package), with pin 1 as VOUT, pin 2 as −IN, pin 3 as +IN, pin 4 as V−, pin 5 as NC, pin 6 as NC, pin 7 as NC, and pin 8 as V+. All NC pins are unconnected internally and must be left floating or grounded per layout best practices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Amplifier output | Drives ADC input or active filter stage; rail-to-rail swing (10 mV from rails) minimizes headroom loss in 0–5 V systems. |
| −IN (Pin 2) | Inverting input | Accepts differential or single-ended feedback; 0.2 pA bias current enables high-Z sensor interfaces without leakage error. |
| +IN (Pin 3) | Noninverting input | Supports unity-gain buffer configuration; 100-mV beyond-rail capability allows direct connection to overvoltage-protected transducer outputs. |
| V− (Pin 4) | Negative supply | Ground reference in single-supply mode; must be decoupled with 0.1-µF ceramic capacitor placed ≤2 mm from pin. |
| NC (Pins 5, 6, 7) | No internal connection | Electrically isolated; may be tied to ground for thermal relief or left unconnected - no impact on performance. |
| V+ (Pin 8) | Positive supply | Accepts 2.2–5.5 V; internal charge pump ensures stable biasing across full voltage range, eliminating GBW droop at low VS. |
Key Features
| Feature | Design Value |
|---|---|
| Zerø-crossover input topology | Eliminates crossover distortion-induced harmonics, delivering 0.0004% THD+N across full input common-mode range - critical for audio fidelity and spectral purity in spectrum analyzers. |
| Rail-to-rail input and output | Enables full utilization of 0–5 V ADC input range without external level-shifting circuitry, reducing BOM count and board area in portable test equipment. |
| 100-dB minimum CMRR | Maintains signal integrity in noisy industrial environments where sensor leads share routing with motor drives or switching regulators. |
| 4.5 nV/√Hz input voltage noise | Preserves SNR in low-level sensor amplification (e.g., thermocouples, strain gauges) without requiring additional gain-stage noise filtering. |
| 0.2 pA typical input bias current | Permits use with high-impedance pH electrodes or photodiode transimpedance configurations without significant DC offset drift. |
Applications
| Audio Signal Conditioning | Data Acquisition Front-End |
|---|---|
Use Scenario: Amplifying electret microphone output in portable voice recorders with 3.3-V supply and 0–3.3 V ADC input range. IC Role / Device Role / Timing Role: Single-supply noninverting preamplifier with 1.5-V common-mode bias; provides 20-dB gain while preserving 20-Hz–20-kHz bandwidth. Use Value: Zero-crossover topology prevents audible intermodulation distortion during loud transients; rail-to-rail output ensures full 3.3-V peak-to-peak swing into 10-kΩ ADC input. | Use Scenario: Driving 16-bit SAR ADC in handheld multimeter with 0–5 V input range and 100-kSPS sampling. IC Role / Device Role / Timing Role: Unity-gain buffer isolating RC anti-aliasing filter from ADC input capacitance; settles to 0.01% in 300 ns. Use Value: 25-V/µs slew rate and 50-MHz GBW prevent settling errors at full-scale steps; 100-µV offset contributes <0.002% of FS error before calibration. |
| Process Control Sensor Interface | Active Filter for Test Equipment |
Use Scenario: Amplifying 4–20 mA loop-powered RTD bridge output in PLC analog input module operating from 24-V rail. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end stage with 100-mV beyond-rail input to accommodate sensor overvoltage faults. Use Value: 100-dB CMRR rejects common-mode noise from shared 24-V bus; 0.2-pA bias current avoids loading high-resistance RTD elements. | Use Scenario: Implementing 500-kHz second-order Butterworth low-pass filter in oscilloscope channel path to suppress aliasing. IC Role / Device Role / Timing Role: Multiple-feedback (MFB) active filter core with 50-MHz GBW enabling flat passband response up to 250 kHz. Use Value: 4.5-nV/√Hz noise floor preserves signal-to-noise ratio in high-gain measurement modes; stable with 1-nF capacitive loads without external compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, low-distortion operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA365AIDBVR | Same electrical specs; SOT-23-5 package (5-pin) vs SOIC-8 - 2.9 mm² vs 15.4 mm² footprint. | Preferred for space-constrained portable devices; requires different PCB layout and thermal management due to higher θJA (206.9°C/W). | Select OPA365AIDBVR when board area is critical and thermal dissipation ≤150 mW is achievable. |
| TLV365IDR | Lower offset drift (0.4 µV/°C vs 1 µV/°C); identical 50-MHz GBW and 25-V/µs slew rate; 4.6-mA IQ same. | Better DC stability over temperature in uncalibrated industrial sensors; same AC performance for ADC driving. | Choose TLV365IDR when long-term offset drift dominates system error budget over −40°C to +125°C. |
Compared with OPA365AIDG4, OPA365AIDBVR offers identical performance in a miniature package but demands tighter thermal design, while TLV365IDR trades marginally better DC drift for equivalent speed and noise - making it preferable only when temperature-induced offset drift exceeds 0.5 µV/°C in the target application.
Availability
OPA365AIDG4 is available at Aetrix Electronics and suitable for data acquisition, process control, and active filter applications requiring stable component supply across automotive, industrial, and test equipment production cycles.
Supply support for OPA365AIDG4 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 over 90 years of innovation in precision amplifiers and signal-chain solutions.
The OPAx365 product line was engineered specifically for high-fidelity, single-supply signal conditioning - targeting ADC drivers, sensor interfaces, and wideband active filters where zero-crossover distortion and rail-to-rail operation are mandatory.
FAQ
What is the maximum capacitive load the OPA365AIDG4 can drive stably in unity-gain configuration?
The OPA365AIDG4 remains stable with pure capacitive loads up to 1 nF in unity-gain buffer configuration, as confirmed by TI SBOS365G Figure 7-15. For loads exceeding 1 nF, a series output resistor (10–20 Ω) is recommended to restore phase margin - though this introduces a small gain error (e.g., 0.2% with 10-kΩ load). The OPA365AIDG4's internal compensation is optimized for this behavior without requiring external components under standard conditions.
Does the OPA365AIDG4 support true 0-V output in single-supply operation?
Yes - the OPA365AIDG4 can achieve 0-V output in single-supply mode using an external pulldown resistor (e.g., 10 kΩ to −5 V), as detailed in TI SBOS365G Section 8.3.4. This technique leverages its specially designed CMOS output stage; however, doing so reduces open-loop gain and bandwidth slightly. The OPA365AIDG4's rail-to-rail output normally swings to within 10 mV of ground, but the pulldown method extends it to true 0 V for demanding ADC interface requirements.
What is the input common-mode voltage range specification for the OPA365AIDG4?
The OPA365AIDG4 features a true rail-to-rail input stage with a common-mode voltage range of V− − 0.1 V to V+ + 0.1 V, verified across −40°C to +125°C per SBOS365G Section 7.6. This 100-mV beyond-rail capability allows direct interfacing with overvoltage-protected sensors or filtered signals that transiently exceed supply rails - a key advantage over conventional rail-to-rail op amps that clip at the rails.
How does the zerø-crossover topology in the OPA365AIDG4 improve THD+N performance?
The zerø-crossover topology in the OPA365AIDG4 eliminates the input-stage transition distortion inherent in complementary bipolar or CMOS input pairs, resulting in continuous transconductance across the entire input common-mode range. This yields 0.0004% THD+N at 1 kHz (SBOS365G Section 1), versus typical 0.001–0.01% in conventional rail-to-rail op amps - directly improving SFDR in audio and spectrum analysis applications where harmonic content must be minimized.
Is the OPA365AIDG4 qualified for automotive applications?
The OPA365AIDG4 is specified for operation from −40°C to +125°C and meets TI's standard industrial reliability testing, but it is not AEC-Q200 qualified or marketed for automotive use. For automotive-grade alternatives, TI recommends the OPA365-Q1 (Q1 suffix), which undergoes full AEC-Q100 stress testing and includes enhanced ESD protection (±4-kV HBM) - the OPA365AIDG4 itself lacks automotive qualification documentation and should not be deployed in safety-critical vehicle systems without additional validation.
OPA365AIDG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 25V/µs
- Gain Bandwidth Product:
- 50 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.2 pA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 4.6mA
- Current - Output / Channel:
- 65 mA
- Voltage - Supply Span (Min):
- 2.2 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA365AIDG4 FAQ
1.How can I place an order for OPA365AIDG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA365AIDG4 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 OPA365AIDG4 reliable?
The price and inventory of OPA365AIDG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA365AIDG4 is usually 5 days.
3.What payment methods are accepted for OPA365AIDG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA365AIDG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA365AIDG4?
OPA365AIDG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA365AIDG4 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 OPA365AIDG4?
For technical support, including OPA365AIDG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA365AIDG4 requirements.
6.How does Aetrix verify that OPA365AIDG4 is sourced from the original manufacturer or authorized distributors?
All OPA365AIDG4 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 OPA365AIDG4 meets industry standards.
7.What is the process for return or replacement of OPA365AIDG4?
All OPA365AIDG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA365AIDG4, 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 OPA365AIDG4 part is unused and in its original packaging.
Return procedure for OPA365AIDG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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