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Texas Instruments OPA4991QDRQ1
- Part No.:
- OPA4991QDRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA4991QDRQ1.pdf
- Description:
- AUTOMOTIVE-GRADE, QUAD, 40-V, 4.
- Quantity:
- Payment:
- Shipping:
Inventory:21,188
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Product details
Overview
OPA4991QDRQ1 from Texas Instruments is a quad-channel, AEC-Q100 Grade 1 automotive operational amplifier with rail-to-rail input and output, ±125 µV max 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 inverters and ADAS sensor interfaces.
For engineers reviewing the OPA4991QDRQ1 datasheet, OPA4991QDRQ1 pinout, OPA4991QDRQ1 application, or OPA4991QDRQ1 equivalent, this page delivers verified electrical specs, package-specific pin functions, real-world automotive use cases, and validated alternative op amps for design continuity and supply resilience.
Technical Context
The OPA4991QDRQ1 implements a dual-input-stage architecture (NCH and PCH front end) enabling full rail-to-rail common-mode input range up to the supply rails, eliminating need for external clamping diodes while maintaining MUX-friendly operation and comparator-mode functionality. Its shutdown circuitry supports low-power state control per channel group.
It delivers ±75 mA output drive into capacitive loads up to 1 nF, sustains 130 dB CMRR at 40 V supply, and achieves 0.00021% THD+N at 1 kHz - critical for high-fidelity analog front ends in battery management and motor control feedback loops.
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/48 V automotive battery rails without LDO pre-regulation. |
| Input Offset Voltage | ±125 µV (max): enables sub-0.1% error in 100 mV full-scale current-sense applications across –40°C to +125°C. |
| Offset Drift | ±0.3 µV/°C (typ): ensures <1 µV total drift over 100°C ambient range - critical for stable DC-coupled sensor amplification. |
| Gain-Bandwidth Product | 4.5 MHz: supports closed-loop gains up to 45 at 100 kHz for fast transient response in motor phase current monitoring. |
| Slew Rate | 21 V/µs: allows clean 10 V step response in ≤0.5 µs - essential for accurate pulse-width measurement in gate driver feedback paths. |
| Output Drive | ±75 mA (min): drives 2 kΩ loads to rail with <250 mV headroom at 40 V supply - suitable for driving ADC reference buffers or FET gate resistors. |
| Capacitive Load Drive | 1000 pF: stabilizes directly into typical EMI filter networks (e.g., RC snubbers) without isolation resistors. |
Pinout & Package
TSSOP-14 (PW) package: 5.0 mm × 6.4 mm body, 0.65 mm pitch, surface-mount, thermally enhanced for automotive under-hood environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1+, IN2+, IN3+, IN4+ | Noninverting inputs (ch1–ch4) | Accept signals from –0.1 V to V+ + 0.1 V - enables direct connection to shunt resistors referenced to high-side bus voltages. |
| IN1−, IN2−, IN3−, IN4− | Inverting inputs (ch1–ch4) | Support differential input ranges up to full 40 V - eliminates need for level-shifting in multi-supply systems. |
| OUT1–OUT4 | Amplifier outputs (ch1–ch4) | Rail-to-rail swing with <10 mV headroom (no load, 40 V supply) - minimizes dynamic range loss in ADC interfacing. |
| V+ | Positive power supply | Connects to highest potential rail (up to +40 V); supplies all four channels simultaneously. |
| V− | Negative power supply | Connects to lowest potential rail (down to –40 V or GND); shared return for all channels and internal biasing. |
Key Features
| Feature | Design Value |
|---|---|
| MUX-friendly input stage | Differential input voltage range extends to supply rails - enables seamless integration into multiplexed high-voltage sensor arrays without external protection. |
| Shutdown capability | Per-amplifier enable/disable via SHDN pin (not present on OPA4991QDRQ1 variant); low quiescent current (30–45 µA) when disabled - reduces system standby power. |
| Robust EMIRR performance | EMI rejection >60 dB up to 1 GHz - suppresses RF interference from switching converters and wireless modules in infotainment and ADAS ECUs. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C operation with HBM ESD 2A and CDM ESD C6 - meets functional safety requirements for ASIL-B systems. |
| High capacitive load drive | Stable with 1 nF load without external compensation - simplifies filtering of noisy motor current or battery voltage signals. |
Applications
| High-Side Current Sensing | ADAS Radar Signal Conditioning |
|---|---|
Use Scenario: Monitoring phase currents in 400 V traction inverters using Kelvin-connected shunt resistors referenced to high-side DC-link voltage. IC Role / Device Role / Timing Role: Quad-channel precision instrumentation amplifier front end - each channel conditions one phase current with matched gain and offset. Use Value: ±125 µV offset and ±0.3 µV/°C drift ensure <0.2% full-scale error over temperature - critical for torque accuracy and thermal derating algorithms. |
Use Scenario: Amplifying low-amplitude IF signals from 77 GHz radar receivers before digitization in autonomous driving domain controllers. IC Role / Device Role / Timing Role: Low-noise (10.8 nV/√Hz), wideband (4.5 MHz) gain block with rail-to-rail output - preserves SNR and dynamic range. Use Value: 130 dB CMRR rejects common-mode noise from adjacent high-speed digital buses - maintains radar cross-section fidelity. |
| On-Board Charger (OBC) Voltage Regulation | Body Control Module (BCM) Sensor Hub |
Use Scenario: Closed-loop feedback for isolated DC-DC converters regulating 12 V auxiliary supply from 400 V battery in EV OBC units. IC Role / Device Role / Timing Role: Error amplifier in optocoupler-isolated voltage loop - compares regulated output against precision reference. Use Value: 4.5 MHz GBW and 21 V/µs slew rate enable fast transient response to load steps - improves OBC efficiency and stability margin. |
Use Scenario: Consolidating analog outputs from multiple cabin sensors (temperature, humidity, light, occupancy) into single MCU interface in BCM. IC Role / Device Role / Timing Role: Quad-channel signal conditioner with configurable gain and filtering - reduces BOM count and PCB area. Use Value: 1000 pF capacitive load drive allows direct connection to RC anti-alias filters - eliminates buffer stages and layout complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision automotive op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM324BQPWRQ1 | Lower bandwidth (1.2 MHz), higher offset (±3 mV), no rail-to-rail input - requires external level shifting for high-side sensing. | Targeted at cost-sensitive body electronics where precision is secondary to qualification and footprint compatibility. | Choose when budget constraints outweigh need for low-drift performance and high-voltage signal chain integrity. |
| TSV914IQDT | Higher offset drift (±3.5 µV/°C), lower supply range (up to 36 V), no AEC-Q100 Grade 1 rating - limited to non-safety-critical zones. | Used in infotainment audio preprocessing where extended temperature range is not required. | Choose only for interior modules operating below 105°C ambient and where functional safety certification is not mandated. |
Compared with LM324BQPWRQ1 and TSV914IQDT, the OPA4991QDRQ1 provides 3.75× higher bandwidth, 24× lower offset, and full AEC-Q100 Grade 1 compliance - making it the sole option for ASIL-B–compliant current sensing and radar signal chains requiring DC precision and high-voltage robustness.
Availability
OPA4991QDRQ1 is available at Aetrix Electronics and suitable for HEV/EV inverter control, ADAS radar front ends, and on-board charger regulation requiring stable component supply across automotive production lifecycles.
Supply support for OPA4991QDRQ1 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 delivering analog and embedded processing solutions for automotive, industrial, and personal electronics markets.
The OPAx991-Q1 family was engineered specifically for high-voltage, high-precision automotive signal conditioning - targeting current sensing, battery monitoring, and sensor interface applications demanding AEC-Q100 Grade 1 reliability and DC accuracy.
FAQ
What is the maximum supply voltage for OPA4991QDRQ1?
The OPA4991QDRQ1 supports a maximum supply voltage of 40 V (V+ to V−), with absolute maximum ratings allowing up to 42 V for short-duration transients. This enables direct operation from 24 V and 48 V automotive battery rails without intermediate regulation - critical for space-constrained inverter and OBC designs where efficiency and thermal management are paramount. The device remains fully specified across its entire 2.7 V to 40 V operating range.
Does OPA4991QDRQ1 include shutdown functionality?
No, the OPA4991QDRQ1 variant does not include a shutdown pin. Shutdown capability is implemented only in the OPA991SQDBVRQ1 (single) and OPA2991SQDGKRQ1 (dual) variants. The OPA4991QDRQ1 is a fixed-function quad op amp with continuous operation - optimized for applications requiring always-on signal conditioning, such as real-time motor phase current monitoring or persistent sensor hub amplification in automotive ECUs.
What package options are available for OPA4991QDRQ1?
The OPA4991QDRQ1 is offered exclusively in the TSSOP-14 (PW) package: 5.0 mm × 6.4 mm body size, 0.65 mm lead pitch, and thermally enhanced construction rated for –40°C to +125°C operation. This package provides superior thermal resistance (RθJA = 118.0°C/W) compared to SOIC-14 and SOT-23-14 variants, making it ideal for high-power-density automotive modules where board-level heat dissipation is constrained.
How does OPA4991QDRQ1 achieve rail-to-rail input operation?
The OPA4991QDRQ1 uses a dual-input-stage architecture combining N-channel and P-channel differential pairs, enabling continuous operation across the full common-mode input range from (V−) − 0.1 V to (V+) + 0.1 V. This eliminates reliance on input clamping diodes and avoids signal distortion during fast transients - a key advantage over conventional op amps when interfacing with high-side shunts or multiplexed sensor arrays where input voltages swing near supply rails.
Is OPA4991QDRQ1 qualified for ASIL-B applications?
Yes, the OPA4991QDRQ1 is AEC-Q100 Grade 1 qualified (–40°C to +125°C), with documented HBM ESD classification Level 2A (±2 kV) and CDM Level C6 (±1 kV). While ASIL-B compliance requires system-level analysis, this qualification - combined with its low drift, high CMRR, and robust EMIRR - makes OPA4991QDRQ1 suitable for use in ASIL-B–targeted subsystems including traction inverter current sensing, battery pack monitoring, and radar receiver signal chains where hardware fault tolerance and long-term parametric stability are mandatory.
OPA4991QDRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- 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 (x4 Channels)
- 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:
- 14-SOIC
OPA4991QDRQ1 FAQ
1.How can I place an order for OPA4991QDRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4991QDRQ1 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 OPA4991QDRQ1 reliable?
The price and inventory of OPA4991QDRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4991QDRQ1 is usually 5 days.
3.What payment methods are accepted for OPA4991QDRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4991QDRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4991QDRQ1?
OPA4991QDRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4991QDRQ1 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 OPA4991QDRQ1?
For technical support, including OPA4991QDRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4991QDRQ1 requirements.
6.How does Aetrix verify that OPA4991QDRQ1 is sourced from the original manufacturer or authorized distributors?
All OPA4991QDRQ1 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 OPA4991QDRQ1 meets industry standards.
7.What is the process for return or replacement of OPA4991QDRQ1?
All OPA4991QDRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with OPA4991QDRQ1, 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 OPA4991QDRQ1 part is unused and in its original packaging.
Return procedure for OPA4991QDRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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