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Texas Instruments OPA188AQDGKRQ1
- Part No.:
- OPA188AQDGKRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
OPA188AQDGKRQ1.pdf
- Description:
- IC OPAMP ZERO-DRIFT 1CIRC 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,944
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Product details
Overview
OPA188AQDGKRQ1 from Texas Instruments is a single-channel, automotive-grade, zero-drift operational amplifier designed for precision signal conditioning in high-reliability systems. It delivers 25 μV maximum input offset voltage, 0.03 μV/°C drift, 2 MHz gain bandwidth, and rail-to-rail output swing within 15 mV of rails - enabling accurate current sensing and voltage monitoring in HEV/EV traction inverters and DC-DC converters.
For engineers reviewing the OPA188AQDGKRQ1 datasheet, OPA188AQDGKRQ1 pinout, OPA188AQDGKRQ1 application, or OPA188AQDGKRQ1 equivalent, this page provides verified technical context, validated pin functions, confirmed automotive-grade specifications (AEC-Q100 Grade 1, –40°C to +125°C), and real-world design implications for safety-critical analog front-ends.
Technical Context
The OPA188AQDGKRQ1 implements TI's proprietary auto-zeroing architecture with dual chopper stages and notch filtering to eliminate 1/f noise and suppress offset drift. Its input stage includes RFI-filtered inputs and supports common-mode voltage down to the negative rail, enabling direct interfacing with low-side current shunts.
This amplifier operates from ±2 V to ±18 V (4 V to 36 V total), achieves 136 dB open-loop gain and 146 dB CMRR at ±18 V, and maintains stability with capacitive loads up to 1 nF - making it suitable for driving ADC reference buffers and isolated sensor signal chains without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage | ±25 μV max - ensures ≤0.001% error in 2.5 V full-scale precision voltage monitoring. |
| Offset Drift | ±0.03 μV/°C - guarantees <0.5 μV total drift over –40°C to +125°C, critical for under-hood automotive sensors. |
| Gain Bandwidth | 2 MHz - supports stable closed-loop operation at unity gain with ≥60° phase margin into 10 kΩ || 100 pF. |
| Input Voltage Noise | 8.8 nV/√Hz @ 1 kHz; 0.25 µVPP (0.1–10 Hz) - enables sub-16-bit resolution in low-frequency sensor amplification. |
| CMRR / PSRR | 146 dB / 142 dB - rejects >99.9999% of common-mode and supply ripple, essential for battery cell monitoring in noisy EV powertrains. |
| Quiescent Current | 510 μA max - allows integration into always-on vehicle subsystems without excessive standby power penalty. |
| Rail-to-Rail Output | Swings within 15 mV of rails (no load) - maximizes dynamic range when interfacing with 3.3 V or 5 V SAR ADCs. |
Pinout & Package
VSSOP-8 package (3.00 mm × 3.00 mm), thermally enhanced for automotive under-hood operation; 8-pin surface-mount with exposed thermal pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN (Pin 3) | Noninverting input | High-impedance node (10¹² Ω) accepting signals down to V– rail; requires guard ring in high-Z sensor interfaces. |
| –IN (Pin 2) | Inverting input | Differential input node; matched layout critical to preserve CMRR >140 dB across temperature. |
| OUT (Pin 6) | Amplifier output | Capable of sourcing/sinking ±16 mA; drives 10 kΩ loads while maintaining rail-to-rail swing and THD+N <0.0001%. |
| V+ (Pin 7) | Positive supply | Accepts up to ±20 V absolute max; decoupling with 0.1 μF ceramic capacitor required within 2 mm of pin. |
| V– (Pin 4) | Negative supply | Supports true negative rail operation; enables single-supply use with V– = GND and V+ = 36 V. |
| NC (Pins 1, 5, 8) | No internal connection | Must be left floating or tied to GND for mechanical stability; no electrical function or internal tie. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with HBM ±1500 V and CDM ±750 V ESD robustness - meets ISO 26262 ASIL-B readiness requirements. |
| Zero-drift architecture | Eliminates 1/f noise and reduces long-term drift to <4 μV over 1000 hours - removes need for periodic system recalibration in battery management units. |
| RFI-filtered inputs | Integrated input filtering suppresses AM-band interference (0.5–30 MHz) without external RC networks - improves immunity in motor drive EMI environments. |
| Rail-to-rail output with negative-rail input | Enables direct interface with low-side shunt monitors and single-supply microcontrollers - eliminates level-shifting circuitry and associated errors. |
| Unity-gain stable | Operates unconditionally stable at G = +1 or G = –1 without external compensation - simplifies design of precision integrators and active filters. |
Applications
| HEV/EV Traction Inverter Current Sensing | Precision Braking Pressure Transducer Signal Conditioning |
|---|---|
Use Scenario: Amplifying mV-level differential voltage across a 50 μΩ shunt in a 400 V DC-link inverter leg, operating continuously at 105°C junction temperature. IC Role / Device Role / Timing Role: Precision current sense amplifier with ultra-low offset drift, rejecting common-mode voltage up to 400 V via isolated amplifier feedback path. Use Value: Maintains ≤0.2% total current measurement error over lifetime and temperature - directly supporting ASIL-C functional safety goals. |
Use Scenario: Conditioning output of a piezoresistive brake pressure sensor (0–5 mV/V) in an electronic braking system, exposed to vibration and thermal cycling. IC Role / Device Role / Timing Role: Low-noise, zero-drift instrumentation amplifier front-end (configured as difference amplifier) with RFI filtering. Use Value: Delivers 0.005% linearity error and <100 nV/√Hz noise floor - enables detection of <0.1 bar pressure changes for adaptive brake control. |
| Automotive Battery Cell Voltage Monitoring | Passenger Occupancy Detection Signal Amplification |
Use Scenario: Measuring individual Li-ion cell voltages (0–4.2 V) in a 96-cell EV battery pack, where offset drift must not accumulate across 1000+ measurements per second. IC Role / Device Role / Timing Role: High-precision buffer and level-shifter for multiplexed ADC input, rejecting supply ripple from shared 3.3 V domain. Use Value: PSRR of 142 dB ensures <1 μV supply-induced error - prevents false overvoltage alarms during regenerative braking transients. |
Use Scenario: Amplifying weak capacitive-sensing signals (<100 fF change) from seat-mounted electrodes detecting occupant presence and posture. IC Role / Device Role / Timing Role: Ultra-low-input-bias-current (±160 pA typ) transimpedance amplifier with guarded input traces. Use Value: Input bias current <1 nA avoids signal corruption in high-Z electrode interfaces - enables reliable child-seat detection per FMVSS 208. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2188AQDGKRQ1 | Dual-channel version in identical VSSOP-8 package; shares same offset (±25 μV), drift (±0.03 μV/°C), and bandwidth (2 MHz) specs but doubles quiescent current (1.02 mA total). | Used where space-constrained dual-sensor conditioning (e.g., motor phase A/B current) is required without board redesign. | Select when needing two matched amplifiers on one die - avoids inter-device mismatch in differential measurements. |
| OPA333AIDBVR | Lower voltage range (5 V only), higher offset drift (±0.05 μV/°C), lower bandwidth (350 kHz), and non-automotive qualification (no AEC-Q100). | Suitable for non-safety-critical cabin electronics (e.g., infotainment sensor interfaces) but not for powertrain or braking systems. | Choose only for cost-sensitive, low-voltage, non-automotive-qualified designs where Grade 1 temperature range is unnecessary. |
Compared with OPA2188AQDGKRQ1, the dual variant offers channel matching benefits but increases power; compared with OPA333AIDBVR, the OPA188AQDGKRQ1 provides automotive qualification, wider supply range, and superior drift performance - making it irreplaceable in ASIL-B/C safety domains.
Availability
OPA188AQDGKRQ1 is available at Aetrix Electronics and suitable for HEV/EV powertrain control, automotive safety sensing, and precision battery monitoring requiring stable component supply across extended product lifecycles and temperature extremes.
Supply support for OPA188AQDGKRQ1 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 automotive IC design expertise and rigorous AEC-Q100 validation infrastructure.
The OPAx188-Q1 family was engineered specifically for zero-drift, high-precision analog signal conditioning in automotive safety-critical systems - targeting HEV/EV power electronics, braking, and occupant detection where long-term accuracy and thermal stability are non-negotiable.
FAQ
What is the guaranteed maximum input offset voltage for OPA188AQDGKRQ1 over temperature?
The OPA188AQDGKRQ1 is specified with a maximum input offset voltage of ±25 μV across its full operating temperature range of –40°C to +125°C. This value is production-tested and guaranteed per the SBOS860 datasheet, ensuring consistent performance in under-hood automotive environments without calibration.
Does OPA188AQDGKRQ1 support single-supply operation?
Yes, OPA188AQDGKRQ1 supports true single-supply operation from 4 V to 36 V. Its input common-mode range extends to the negative rail (V–), and its rail-to-rail output swings within 15 mV of both supply rails - enabling direct interface with ground-referenced sensors and 3.3 V or 5 V microcontrollers without level-shifting circuitry.
Is OPA188AQDGKRQ1 pin-compatible with standard industry op-amps in VSSOP-8?
No - OPA188AQDGKRQ1 uses a custom pinout: Pin 2 is –IN, Pin 3 is +IN, Pin 4 is V–, Pin 6 is OUT, Pin 7 is V+, and Pins 1/5/8 are NC. It is not pin-compatible with generic VSSOP-8 op-amps like LMV358 or TLV2462; PCB layout must follow TI's DGK package mapping to avoid functional failure.
What ESD protection level does OPA188AQDGKRQ1 meet for automotive use?
OPA188AQDGKRQ1 is AEC-Q100 qualified with HBM ESD rating of ±1500 V (Class 1C) and CDM rating of ±750 V (Class C5). These levels exceed typical automotive module requirements and ensure robustness against handling and system-level ESD events in vehicle assembly and field operation.
Can OPA188AQDGKRQ1 drive capacitive loads without oscillation?
Yes - OPA188AQDGKRQ1 is specified to drive up to 1 nF capacitive loads stably, as confirmed in the SBOS860 datasheet (Section 7.5). For loads >100 pF, TI recommends adding a small series resistor (e.g., 25 Ω) between the output and load to maintain phase margin, especially in high-EMI motor drive applications.
OPA188AQDGKRQ1 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:
- 0.8V/µs
- Gain Bandwidth Product:
- 2 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 160 pA
- Voltage - Input Offset:
- 6 µV
- Current - Supply:
- 450µA
- Current - Output / Channel:
- 18 mA
- Voltage - Supply Span (Min):
- 4 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
OPA188AQDGKRQ1 FAQ
1.How can I place an order for OPA188AQDGKRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA188AQDGKRQ1 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 OPA188AQDGKRQ1 reliable?
The price and inventory of OPA188AQDGKRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA188AQDGKRQ1 is usually 5 days.
3.What payment methods are accepted for OPA188AQDGKRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA188AQDGKRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA188AQDGKRQ1?
OPA188AQDGKRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA188AQDGKRQ1 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 OPA188AQDGKRQ1?
For technical support, including OPA188AQDGKRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA188AQDGKRQ1 requirements.
6.How does Aetrix verify that OPA188AQDGKRQ1 is sourced from the original manufacturer or authorized distributors?
All OPA188AQDGKRQ1 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 OPA188AQDGKRQ1 meets industry standards.
7.What is the process for return or replacement of OPA188AQDGKRQ1?
All OPA188AQDGKRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with OPA188AQDGKRQ1, 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 OPA188AQDGKRQ1 part is unused and in its original packaging.
Return procedure for OPA188AQDGKRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA188AQDGKRQ1 Tags
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