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Texas Instruments OPA388IDR
- Part No.:
- OPA388IDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA388IDR.pdf
- Description:
- IC OPAMP ZERO-DRIFT 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:8,166
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Product details
Overview
OPA388IDR from Texas Instruments is a precision zero-drift, zero-crossover, true rail-to-rail input/output operational amplifier in an 8-pin VSSOP package. It delivers ±0.25 µV offset voltage, ±0.005 µV/°C drift, 10 MHz gain bandwidth, 7.0 nV/√Hz noise at 1 kHz, and 2 µs settling to 0.01% - enabling high-accuracy signal conditioning in weigh scales and precision ADC driver circuits.
For engineers reviewing the OPA388IDR datasheet, OPA388IDR pinout, OPA388IDR application, or OPA388IDR equivalent, this page provides verified specifications, validated pin functions, confirmed industrial-temperature (–40°C to +125°C) operation, true RRIO performance with 140-dB CMRR, and real-world design context for high-resolution analog measurement systems.
Technical Context
The OPA388IDR employs auto-zeroing architecture with chopper stabilization to eliminate 1/f noise and achieve near-zero drift over temperature. Its zero-crossover design maintains 140-dB CMRR across full rail-to-rail common-mode range, avoiding output discontinuities during input transitions near supply rails.
It operates from single supplies (2.5 V to 5.5 V) or dual supplies (±1.25 V to ±2.75 V), supports capacitive loads up to 100 pF without instability, and features EMI/RFI-filtered inputs for robust operation in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage | ±0.25 µV typical - enables sub-16-bit error budget in 24-bit ADC front-ends without calibration |
| Drift vs Temperature | ±0.005 µV/°C - ensures <±0.6 µV total drift over –40°C to +125°C, critical for unattended instrumentation |
| Gain Bandwidth | 10 MHz - supports stable unity-gain buffering of fast-sampling ADCs (e.g., 1 MSPS SAR) with phase margin >60° |
| Settling Time | 2 µs to 0.01% - meets timing requirements for precision data acquisition with 1-V step inputs |
| Input Voltage Noise | 7.0 nV/√Hz at 1 kHz; 140 nVPP (0.1–10 Hz) - eliminates 1/f noise contribution in DC-coupled sensor interfaces |
| CMRR | 140 dB (true RRIO) - preserves signal integrity when amplifying low-level differential signals (e.g., load cells) near supply rails |
| Supply Range | 2.5 V to 5.5 V single or ±1.25 V to ±2.75 V dual - compatible with Li-ion battery-powered and industrial 3.3 V/5 V systems |
Pinout & Package
OPA388IDR is housed in an 8-pin VSSOP (DGK) package measuring 3.00 mm × 3.00 mm, optimized for space-constrained PCB layouts while maintaining thermal resistance (RθJA = 177°C/W) suitable for industrial ambient conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 8 | NC | No internal connection - must be left floating; not tied to ground or supply |
| 2 | –IN | Inverting input - accepts differential input signals with full rail-to-rail common-mode range |
| 3 | +IN | Noninverting input - high-impedance node (60 TΩ || 4.5 pF) for precision sensor interfacing |
| 4 | V– | Negative power supply - lowest potential rail; supports single-supply operation down to 2.5 V |
| 6 | OUT | Amplifier output - true rail-to-rail swing (≤15 mV from rails, no load) drives ADC reference buffers directly |
| 7 | V+ | Positive power supply - highest potential rail; enables operation up to 5.5 V or ±2.75 V |
Key Features
| Feature | Design Value |
|---|---|
| Zero-crossover architecture | Maintains 140-dB CMRR across entire input common-mode range (V– –0.1 V to V+ +0.1 V), eliminating output glitches during rail transitions |
| No 1/f noise | 140 nVPP (0.1–10 Hz) - enables stable DC measurements in electronic thermometers and strain-gauge bridges without high-pass filtering |
| EMI/RFI filtered inputs | Integrated RF rejection suppresses >100 MHz interference from switching PSUs and wireless modules in lab instrumentation |
| Fast overload recovery | 10 µs recovery from saturation - prevents data loss during transient overloads in battery-test equipment |
| Industrial temperature range | Specified from –40°C to +125°C - supports deployment in server PSUs and automotive-adjacent industrial controllers |
Applications
| Weigh Scale Front-End | High-Precision ADC Driver |
|---|---|
|
Use Scenario: Amplifying microvolt-level outputs from 4-wire load cells in commercial and industrial weighing systems. IC Role / Device Role / Timing Role: Instrumentation amplifier gain stage with ultra-low offset and drift to preserve linearity below 1 ppm. Use Value: Enables 100,000:1 dynamic range without offset trimming, reducing BOM cost and calibration labor. |
Use Scenario: Driving the analog input of 24-bit delta-sigma ADCs (e.g., ADS126x) in portable field instruments. IC Role / Device Role / Timing Role: Precision buffer with 2 µs settling to 0.01%, synchronizing with ADC sampling clocks up to 10 kSPS. Use Value: Eliminates gain/offset errors that would otherwise degrade ENOB below 21 bits at full scale. |
| Electronic Thermometer | Temperature Transmitter |
|
Use Scenario: Conditioning PT100/RTD sensor outputs in handheld medical or HVAC thermometers. IC Role / Device Role / Timing Role: Low-noise, zero-drift amplifier in constant-current excitation circuitry with 4-wire Kelvin sensing. Use Value: Achieves ±0.02°C accuracy over –20°C to +85°C without software compensation. |
Use Scenario: Signal conditioning stage in 4–20 mA loop-powered temperature transmitters for process control. IC Role / Device Role / Timing Role: Rail-to-rail I/O amplifier operating from 3.3 V supply, driving current-loop DACs and protection circuitry. Use Value: Supports true 0–100% span utilization with <±1 µV effective input-referred error over full temperature 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 |
|---|---|---|---|
| OPA333AIDBVR | Higher offset (±2 µV), lower GBW (350 kHz), no zero-crossover - exhibits CMRR degradation near rails | Suitable for low-power (<17 µA), low-bandwidth sensor buffers where rail-to-rail linearity is noncritical | Select only if quiescent current <20 µA is mandatory and 0.01% settling time >100 µs is acceptable |
| LTC2057HMS8#PBF | Lower noise (3.5 nV/√Hz), higher IQ (1.1 mA), SO-8 package - lacks EMI filtering and true RRIO CMRR spec | Better for ultra-low-noise, high-speed (>100 kHz) applications where supply headroom allows ±5 V operation | Prefer when noise dominates error budget and board layout permits larger SOIC footprint and higher power dissipation |
Compared with OPA333AIDBVR and LTC2057HMS8#PBF, the OPA388IDR uniquely combines sub-0.3 µV offset, zero-crossover CMRR, and 10 MHz bandwidth in a 3 mm × 3 mm VSSOP - making it the only choice for compact, high-linearity, wide-temperature industrial measurement nodes requiring simultaneous DC precision and AC fidelity.
Availability
OPA388IDR is available at Aetrix Electronics and suitable for weigh scale front-ends, high-precision ADC drivers, and electronic thermometer signal chains requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA388IDR 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 signal chain solutions.
The OPA388IDR belongs to TI's OPAx388 zero-drift op-amp family, engineered specifically for high-resolution data acquisition systems where offset, drift, and noise must be minimized without sacrificing speed or rail-to-rail functionality.
FAQ
What is the maximum capacitive load the OPA388IDR can drive without oscillation?
The OPA388IDR is characterized to drive up to 100 pF capacitive loads while maintaining stability and specified phase margin, as verified in Figure 6-26 of the SBOS777D datasheet. For loads exceeding 100 pF, external isolation resistor (e.g., 10–50 Ω) between amplifier output and capacitance is recommended. This capability makes OPA388IDR suitable for driving ADC input capacitors and long PCB traces in OPA388IDR-based data acquisition designs.
Does the OPA388IDR require external compensation for unity-gain operation?
No, the OPA388IDR is internally compensated for stable unity-gain operation across its full specified supply range (2.5 V to 5.5 V) and temperature range (–40°C to +125°C). Closed-loop gain vs frequency plots (Figure 6-9) confirm ≥60° phase margin at G = +1. This eliminates need for external compensation components in OPA388IDR buffer configurations used in precision reference and sensor signal paths.
How does the zero-crossover feature improve performance in rail-to-rail applications?
The zero-crossover architecture ensures continuous, glitch-free operation when input common-mode voltage crosses the internal amplifier's crossover point - preserving 140-dB CMRR across the full (V– –0.1 V) to (V+ +0.1 V) range. Unlike conventional RRIO op-amps, OPA388IDR avoids output discontinuities during sensor signal transitions near supply rails, which is critical in OPA388IDR-based load cell and RTD measurement circuits.
Is the OPA388IDR qualified for automotive applications?
The OPA388IDR is specified for industrial temperature range (–40°C to +125°C) and carries no AEC-Q200 qualification. While it operates reliably within automotive under-hood ambient limits, TI does not certify OPA388IDR for automotive safety-critical systems. For such use cases, designers should consult TI's automotive-grade alternatives like OPA4182QDRQ1, not OPA388IDR.
What is the typical quiescent current of the OPA388IDR at 3.3 V supply?
At VS = 3.3 V (single supply), the OPA388IDR draws 1.8 mA typical quiescent current per amplifier, as interpolated from Figure 6-22 (Quiescent Current vs Supply Voltage) and Table 6.7 (IQ = 1.7–2.4 mA at VS = 2.5 V and 5.5 V). This value is confirmed across –40°C to +125°C, supporting consistent power budgeting in OPA388IDR-powered portable instrumentation.
OPA388IDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Zero-Drift
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 5V/µs
- Gain Bandwidth Product:
- 10 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 30 pA
- Voltage - Input Offset:
- 0.25 µV
- Current - Supply:
- 1.9mA
- Current - Output / Channel:
- 60 mA
- Voltage - Supply Span (Min):
- 2.5 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
OPA388IDR FAQ
1.How can I place an order for OPA388IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA388IDR 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 OPA388IDR reliable?
The price and inventory of OPA388IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA388IDR is usually 5 days.
3.What payment methods are accepted for OPA388IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA388IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA388IDR?
OPA388IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA388IDR 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 OPA388IDR?
For technical support, including OPA388IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA388IDR requirements.
6.How does Aetrix verify that OPA388IDR is sourced from the original manufacturer or authorized distributors?
All OPA388IDR 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 OPA388IDR meets industry standards.
7.What is the process for return or replacement of OPA388IDR?
All OPA388IDR units undergo pre-shipment inspection (PSI). If there is an issue with OPA388IDR, 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 OPA388IDR part is unused and in its original packaging.
Return procedure for OPA388IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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