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Texas Instruments OPA991QDCKRQ1
- Part No.:
- OPA991QDCKRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
OPA991QDCKRQ1.pdf
- Description:
- AUTOMOTIVE, SINGLE, 40-V 4.5-MHZ
- Quantity:
- Payment:
- Shipping:
Inventory:2,739
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Product details
Overview
OPA991QDCKRQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified single-channel automotive operational amplifier with rail-to-rail input and output, ±125 µV typical offset voltage, 4.5 MHz gain-bandwidth product, and 21 V/µs slew rate - designed for high-side current sensing and precision signal conditioning in HEV/EV motor control and ADAS sensor interfaces.
For engineers reviewing the OPA991QDCKRQ1 datasheet, OPA991QDCKRQ1 pinout, OPA991QDCKRQ1 application, or OPA991QDCKRQ1 equivalent, this page delivers verified electrical specs, SC70-5 package details, functional pin roles, automotive-grade reliability data, and real-world use cases in high-voltage signal chains.
Technical Context
The OPA991QDCKRQ1 implements a MUX-friendly front-end architecture with dual-input-stage (NCH/PCH) design enabling full-rail common-mode input range up to V+ and differential input swing of 40 V - eliminating need for external clamping diodes while maintaining low distortion. Its shutdown functionality (SHDN pin) supports low-power sleep modes with 30–45 µA quiescent current during disable.
It delivers ±75 mA output drive into capacitive loads up to 1 nF, sustains stable operation with 60° phase margin at 20 pF load, and achieves 0.01% settling in 2.5 µs - making it suitable for multiplexed high-precision ADC driver stages and fast-response current-sense amplifiers in 40 V automotive power domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7 V to 40 V (±1.35 V to ±20 V): supports direct connection to 12 V, 24 V, and 48 V automotive battery rails without level-shifting. |
| Offset Voltage (TYP) | ±125 µV: enables sub-0.1% error in 100 mV full-scale current-sense applications over temperature. |
| Input Offset Drift | ±0.3 µV/°C: ensures <1 µV total drift across –40°C to +125°C, critical for long-term stability in engine bay sensors. |
| Input Voltage Noise | 10.8 nV/√Hz @ 1 kHz: preserves SNR in low-level bridge sensor and thermocouple signal paths. |
| Common-Mode Rejection | 130 dB: rejects battery ripple and EMI in high-side shunt monitoring where CM voltage approaches V+. |
| Capacitive Load Drive | 1000 pF: directly drives anti-aliasing filters and ADC input capacitance without isolation resistors. |
| Quiescent Current | 560 µA per amplifier: allows always-on operation in low-power ADAS subsystems with minimal standby drain. |
Pinout & Package
OPA991QDCKRQ1 is packaged in a 5-pin SC70 (DCK) footprint measuring 2.0 mm × 2.1 mm, optimized for space-constrained automotive modules and PCBs with tight thermal constraints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN+) | Noninverting input | Accepts signals from V– – 0.1 V to V+ + 0.1 V; supports MUX-friendly operation with rail-to-rail common-mode range. |
| 2 (V–) | Negative supply | Lowest potential supply rail; referenced for all bias and output swing calculations. |
| 3 (IN–) | Inverting input | Differential pair input with same rail-to-rail CM range as IN+; enables comparator-mode open-loop use. |
| 4 (OUT) | Amplifier output | Rail-to-rail swing (≤10 mV from rails at no load); sources/sinks ±75 mA; drives 1 nF capacitive loads stably. |
| 5 (V+) | Positive supply | Highest potential supply rail; supports up to 40 V differential; defines upper bound of input/output voltage range. |
Key Features
| Feature | Design Value |
|---|---|
| MUX-friendly inputs | Differential input voltage range extends to full 40 V supply; eliminates external protection diodes and reduces settling time in multiplexed sensor arrays. |
| Rail-to-rail I/O | Input common-mode range spans V– – 0.1 V to V+ + 0.1 V; output swings within 10 mV of rails at no load - maximizes dynamic range in low-voltage ADC interfaces. |
| High EMIRR | Robust electromagnetic interference rejection ratio (>80 dB up to 1 GHz) maintains accuracy in noisy powertrain and infotainment environments. |
| Shutdown mode | SHDN pin disables amplifier with 3 µs turn-off and 8 µs wake-up; reduces quiescent current to 30–45 µA - ideal for duty-cycled sensor nodes. |
| AEC-Q100 Grade 1 | Qualified from –40°C to +125°C ambient; HBM ESD 2A (±2 kV), CDM ESD C6 (±1 kV) - meets automotive reliability requirements without derating. |
Applications
| High-Side Current Sensing | ADAS Radar Signal Conditioning |
|---|---|
|
Use Scenario: Monitoring motor phase current in EV inverter gate drivers using 5 mΩ shunt resistor at 400 V DC bus. IC Role / Device Role / Timing Role: Precision difference amplifier with 130 dB CMRR rejecting 400 V common-mode voltage while resolving 100 mV sense drop. Use Value: Enables accurate torque control with <0.2% gain error over temperature and lifetime, meeting ISO 26262 ASIL-B functional safety targets. |
Use Scenario: Amplifying low-amplitude IF signals from 77 GHz radar receivers before digitization. IC Role / Device Role / Timing Role: Low-noise (10.8 nV/√Hz), wide-bandwidth (4.5 MHz) buffer driving SAR ADC input with minimal THD+N (0.00021%). Use Value: Preserves radar resolution and object detection fidelity by minimizing added noise and distortion in critical analog front-end stage. |
| On-Board Charger (OBC) Voltage Reference Buffer | Body Control Module (BCM) Thermistor Interface |
|
Use Scenario: Buffering precision 4.096 V reference for isolated DC-DC controller feedback in 6.6 kW OBC. IC Role / Device Role / Timing Role: Unity-gain stable rail-to-rail output driver with 21 V/µs slew rate and 1 nF capacitive load capability. Use Value: Eliminates external RC compensation, reduces BOM count, and ensures fast transient response during AC-DC regulation loops. |
Use Scenario: Linearizing NTC thermistor outputs for cabin temperature control in HVAC systems. IC Role / Device Role / Timing Role: Low-drift (±0.3 µV/°C), low-bias-current (±10 pA) amplifier minimizing self-heating error in high-impedance sensor legs. Use Value: Achieves ±0.1°C measurement accuracy over –40°C to +85°C without calibration, reducing software compensation overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA991DRQ1 | SOIC-8 package (4.9 mm × 6 mm); higher RθJA (132.6°C/W); no shutdown pin. | Suitable for board-space-tolerant designs requiring manual power cycling instead of active shutdown. | Select when layout area permits larger package and system-level power management replaces per-amplifier SHDN control. |
| LM7321QDRQ1 | Lower bandwidth (20 MHz), higher offset (±1.8 mV), no rail-to-rail input; AEC-Q100 Grade 1 qualified. | Better suited for general-purpose buffering where precision and rail-to-rail input are not required. | Choose for cost-sensitive non-precision functions like LED driver feedback or basic signal routing where 125 µV offset is unnecessary. |
Compared with OPA991DRQ1 and LM7321QDRQ1, OPA991QDCKRQ1 provides superior DC accuracy, full rail-to-rail input capability, integrated shutdown, and compact SC70 packaging - making it optimal for space-constrained, high-precision automotive signal chains demanding minimal error and robust EMI immunity.
Availability
OPA991QDCKRQ1 is available at Aetrix Electronics and suitable for HEV/EV inverter monitoring, ADAS radar front-ends, and on-board charger reference buffering requiring stable component supply across extended automotive temperature ranges and long production lifecycles.
Supply support for OPA991QDCKRQ1 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 company delivering analog and embedded processing solutions for automotive, industrial, and personal electronics markets.
The OPAx991-Q1 family was engineered specifically for AEC-Q100 Grade 1 automotive signal conditioning - emphasizing low offset drift, high-voltage tolerance, and robustness in electric powertrain and advanced driver assistance systems.
FAQ
What is the maximum supply voltage rating for OPA991QDCKRQ1?
The OPA991QDCKRQ1 supports a maximum supply voltage of 40 V (V+ to V–), with absolute maximum ratings extending to 42 V. It operates across the full automotive range from 2.7 V to 40 V, enabling direct interface with 12 V, 24 V, and 48 V battery systems. This rating is validated per AEC-Q100 stress testing and applies to both single-supply and split-supply configurations.
Does OPA991QDCKRQ1 support true rail-to-rail input operation?
Yes, OPA991QDCKRQ1 supports rail-to-rail input with a common-mode voltage range from V– – 0.1 V to V+ + 0.1 V. Its unique dual-input-stage architecture enables full 40 V differential input swing without external clamping diodes - a key differentiator versus conventional op amps that limit input range to within ~1.5 V of rails.
What is the typical input offset voltage drift of OPA991QDCKRQ1 over temperature?
The OPA991QDCKRQ1 exhibits a typical input offset voltage drift of ±0.3 µV/°C across the full AEC-Q100 Grade 1 range (–40°C to +125°C). This ultra-low drift ensures minimal calibration burden in long-lifetime automotive applications such as battery management and motor control, where offset stability directly impacts measurement accuracy.
Can OPA991QDCKRQ1 be used as a comparator?
Yes, OPA991QDCKRQ1 can operate open-loop as a comparator due to its MUX-friendly inputs, rail-to-rail output, and absence of internal phase-reversal circuitry. The device maintains correct polarity even when inputs exceed supply rails - confirmed in Figure 5-30 (No Phase Reversal) of the datasheet - making it suitable for window-detect and overvoltage latch applications.
What is the capacitive load drive capability of OPA991QDCKRQ1?
OPA991QDCKRQ1 is specified to drive up to 1000 pF capacitive loads while maintaining stability (60° phase margin) and 0.01% settling in ≤2.5 µs. This capability eliminates need for series isolation resistors when interfacing with ADC input capacitance, anti-aliasing filters, or long PCB traces - simplifying layout and improving signal integrity in high-speed sensor interfaces.
OPA991QDCKRQ1 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:
- 21V/µs
- Gain Bandwidth Product:
- 4.5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 10 pA
- Voltage - Input Offset:
- 125 µV
- Current - Supply:
- 560µA
- Current - Output / Channel:
- 75 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 40 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
OPA991QDCKRQ1 FAQ
1.How can I place an order for OPA991QDCKRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA991QDCKRQ1 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 OPA991QDCKRQ1 reliable?
The price and inventory of OPA991QDCKRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA991QDCKRQ1 is usually 5 days.
3.What payment methods are accepted for OPA991QDCKRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA991QDCKRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA991QDCKRQ1?
OPA991QDCKRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA991QDCKRQ1 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 OPA991QDCKRQ1?
For technical support, including OPA991QDCKRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA991QDCKRQ1 requirements.
6.How does Aetrix verify that OPA991QDCKRQ1 is sourced from the original manufacturer or authorized distributors?
All OPA991QDCKRQ1 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 OPA991QDCKRQ1 meets industry standards.
7.What is the process for return or replacement of OPA991QDCKRQ1?
All OPA991QDCKRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with OPA991QDCKRQ1, 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 OPA991QDCKRQ1 part is unused and in its original packaging.
Return procedure for OPA991QDCKRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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