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Texas Instruments OPA388IDGKT
- Part No.:
- OPA388IDGKT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
OPA388IDGKT.pdf
- Description:
- IC OPAMP ZERO-DRIFT 1CIRC 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:307
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Product details
Overview
OPA388IDGKT 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 lab instrumentation.
For engineers reviewing the OPA388IDGKT datasheet, OPA388IDGKT pinout, OPA388IDGKT application, or OPA388IDGKT equivalent, key selection criteria include ultra-low offset stability over temperature, true RRIO operation with 140-dB CMRR, EMI-filtered inputs, and compatibility with high-resolution ADC/DAC interfaces in single-supply (2.5–5.5 V) systems.
Technical Context
The OPA388IDGKT employs auto-zeroing and chopper-stabilized architecture to eliminate 1/f noise and achieve near-zero drift without crossover distortion. Its input stage supports true rail-to-rail common-mode range (V– – 0.1 V to V+ + 0.1 V) and delivers 140-dB CMRR across temperature and supply variations.
It features fast overload recovery (10 µs), low quiescent current (1.7–2.6 mA), and stable drive capability into capacitive loads up to 100 pF. The device operates across –40°C to +125°C and is specified for both single-supply (2.5–5.5 V) and dual-supply (±1.25 V to ±2.75 V) configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage | ±0.25 µV typical - enables sub-ppm linearity 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 field instruments. |
| Gain Bandwidth | 10 MHz - supports closed-loop gains up to 100 with >100 kHz small-signal bandwidth. |
| Input Voltage Noise | 7.0 nV/√Hz at 1 kHz; 140 nVPP (0.1–10 Hz) - eliminates 1/f noise floor for precision DC and low-frequency measurements. |
| CMRR | 140 dB at ±2.75 V supply - maintains accuracy under varying common-mode conditions in sensor interfaces. |
| Supply Range | 2.5 V to 5.5 V single supply - compatible with Li-ion, USB, and industrial 3.3 V/5 V rails without level-shifting. |
| Settling Time | 2 µs to 0.01% for 1-V step - meets timing requirements for high-throughput data acquisition systems. |
Pinout & Package
OPA388IDGKT 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 performance (RθJA = 177°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No internal connection - must be left floating or grounded per layout best practices; not usable as bias or feedback node. |
| 2 | –IN | Inverting input - accepts differential signals with full rail-to-rail common-mode range (V– – 0.1 V to V+ + 0.1 V). |
| 3 | +IN | Noninverting input - matched to –IN for optimal CMRR; EMI-filtered for robustness in noisy environments. |
| 4 | V– | Negative supply terminal - supports ground-referenced single-supply operation or negative rail in dual-supply systems. |
| 5 | NC | No internal connection - electrically isolated; no routing or stitching required. |
| 6 | OUT | Amplifier output - drives true rail-to-rail loads up to 10 kΩ with <20 mV swing from rails (RL = 10 kΩ). |
| 7 | V+ | Positive supply terminal - accepts 2.5–5.5 V single supply or +1.25 V to +2.75 V in dual-supply mode. |
| 8 | NC | No internal connection - unused pad; may be connected to ground plane for thermal enhancement if needed. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-crossover architecture | Eliminates input-stage crossover distortion, preserving 140-dB CMRR across full input range - essential for precision instrumentation amplifiers. |
| EMI/RFI filtered inputs | Integrated input filtering suppresses >100 MHz RF interference without external components - improves reliability in switch-mode power supply environments. |
| No 1/f noise | Flat 7.0 nV/√Hz spectral density down to 0.1 Hz - enables stable DC-coupled measurements in electronic thermometers and load-cell interfaces. |
| Fast settling (0.01%) | 2 µs response to 1-V step - supports ≥500 kSPS sampling in high-resolution SAR ADC drivers without settling error. |
| Rail-to-rail I/O | Input common-mode extends 0.1 V beyond rails; output swings within 15 mV of rails (no load) - maximizes dynamic range in low-voltage systems. |
Applications
| Weigh Scale Front-End | Lab Instrumentation Signal Chain |
|---|---|
|
Use Scenario: Amplifying microvolt-level outputs from precision load cells in digital kitchen or industrial scales. IC Role / Device Role / Timing Role: Low-noise, zero-drift instrumentation amplifier input stage driving 24-bit delta-sigma ADC. Use Value: Enables ±0.001% full-scale accuracy over temperature without factory recalibration due to <±0.6 µV total drift. |
Use Scenario: Buffering reference voltages and conditioning sensor outputs in portable multimeters and data loggers. IC Role / Device Role / Timing Role: Precision unity-gain buffer and active filter stage with 140-dB CMRR and 10-MHz bandwidth. Use Value: Maintains signal integrity in mixed-signal PCBs by rejecting power-supply ripple and EMI via 140-dB PSRR/CMRR. |
| Battery Test Equipment | Temperature Transmitter |
|
Use Scenario: Measuring open-circuit voltage and internal resistance of Li-ion and NiMH cells during charge/discharge cycles. IC Role / Device Role / Timing Role: High-impedance voltage follower and current-sense amplifier interface for 16–24-bit ADCs. Use Value: Achieves <1 µV offset contribution to measurement chain - critical for detecting <1 mV battery voltage changes. |
Use Scenario: Conditioning RTD or thermistor signals in 4–20 mA loop-powered transmitters operating from 12–36 V supplies. IC Role / Device Role / Timing Role: Rail-to-rail input/output amplifier in 3.3 V microcontroller-based analog front-end with cold-junction compensation. Use Value: Supports true single-supply operation down to 2.5 V while delivering 140 nVPP low-frequency noise for ±0.1°C resolution. |
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 - lacks 140-dB CMRR and true RRIO at low supply. | Suitable for cost-sensitive, low-bandwidth sensor buffers where sub-µV offset is not required. | Select when budget constraints outweigh need for 0.25-µV offset and 10-MHz bandwidth. |
| LTC2057HMS8#PBF | Lower noise (5.5 nV/√Hz), higher IQ (1.1 mA), SO-8 only - no VSSOP option; lacks EMI filtering and 140-dB CMRR spec. | Preferred in ultra-low-noise medical-grade amplifiers where board space is less constrained than in portable instruments. | Choose when lowest possible voltage noise dominates over package size, EMI immunity, and guaranteed CMRR. |
Compared with OPA333AIDBVR and LTC2057HMS8#PBF, the OPA388IDGKT uniquely combines ultra-low offset, zero-crossover CMRR, EMI filtering, and VSSOP packaging - making it optimal for space-limited, high-accuracy, noise-immune applications like handheld test equipment and industrial transmitters.
Availability
OPA388IDGKT is available at Aetrix Electronics and suitable for weigh scale design, lab instrumentation development, and battery test equipment requiring stable component supply and long-term manufacturability.
Supply support for OPA388IDGKT 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 OPA388 product line was designed specifically for high-resolution data acquisition systems demanding ultra-low drift, zero-crossover linearity, and rail-to-rail operation in compact, thermally efficient packages.
FAQ
What is the maximum capacitive load the OPA388IDGKT can drive stably?
The OPA388IDGKT is characterized for stable operation with capacitive loads up to 100 pF, as verified in Figure 6-26 of the SBOS777D datasheet. For loads exceeding 100 pF, external isolation resistance (e.g., 10–50 Ω in series with the output) is recommended to maintain phase margin and prevent peaking or oscillation in closed-loop configurations.
Does the OPA388IDGKT require external compensation for unity-gain stability?
No, the OPA388IDGKT is internally compensated for unity-gain stability across its full operating range (2.5–5.5 V supply, –40°C to +125°C). Its 10-MHz gain bandwidth and 5 V/µs slew rate are specified under G = +1 conditions with no external components required, simplifying design in buffer and gain-of-one applications.
How does the zero-crossover feature improve performance in the OPA388IDGKT?
The zero-crossover architecture eliminates input-stage crossover distortion that causes nonlinearity and CMRR degradation near rail transitions. In the OPA388IDGKT, this enables consistent 140-dB CMRR across the entire input common-mode range - critical for accurate differential measurements in instrumentation amplifiers and sensor interfaces.
Can the OPA388IDGKT operate from a 2.5-V single supply while maintaining rail-to-rail output swing?
Yes, the OPA388IDGKT is fully specified for 2.5-V single-supply operation. At 2.5 V and RL = 10 kΩ, its output swings within 5–20 mV of each rail, delivering true rail-to-rail performance essential for maximizing dynamic range in low-voltage data acquisition systems using the OPA388IDGKT.
What is the thermal resistance (RθJA) of the OPA388IDGKT in its VSSOP-8 package?
The OPA388IDGKT in the DGK (VSSOP-8) package has a junction-to-ambient thermal resistance (RθJA) of 177°C/W, as documented in Section 6.4 of the SBOS777D datasheet. This value assumes standard JEDEC 2-layer board conditions; improved copper area or thermal vias can reduce effective RθJA in production layouts.
OPA388IDGKT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-VSSOP
OPA388IDGKT FAQ
1.How can I place an order for OPA388IDGKT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA388IDGKT 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 OPA388IDGKT reliable?
The price and inventory of OPA388IDGKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA388IDGKT is usually 5 days.
3.What payment methods are accepted for OPA388IDGKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA388IDGKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA388IDGKT?
OPA388IDGKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA388IDGKT 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 OPA388IDGKT?
For technical support, including OPA388IDGKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA388IDGKT requirements.
6.How does Aetrix verify that OPA388IDGKT is sourced from the original manufacturer or authorized distributors?
All OPA388IDGKT 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 OPA388IDGKT meets industry standards.
7.What is the process for return or replacement of OPA388IDGKT?
All OPA388IDGKT units undergo pre-shipment inspection (PSI). If there is an issue with OPA388IDGKT, 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 OPA388IDGKT part is unused and in its original packaging.
Return procedure for OPA388IDGKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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