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Texas Instruments OPA4991QDYYRQ1
- Part No.:
- OPA4991QDYYRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-14 Thin, SOT-23 Variant
- Datasheet:
-
OPA4991QDYYRQ1.pdf
- Description:
- IC OPAMP
- Quantity:
- Payment:
- Shipping:
Inventory:1,365
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Product details
Overview
OPA4991QDYYRQ1 from Texas Instruments is a quad-channel, AEC-Q100 Grade 1 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 OPA4991QDYYRQ1 datasheet, OPA4991QDYYRQ1 pinout, OPA4991QDYYRQ1 application, or OPA4991QDYYRQ1 equivalent, this page delivers verified electrical specs, package-validated pin functions, automotive-grade thermal metrics, real-world use-value analysis, and two confirmed alternative parts for design flexibility under AEC-Q100 constraints.
Technical Context
The OPA4991QDYYRQ1 implements a dual-input-stage architecture (NCH and PCH front end) enabling full rail-to-rail common-mode input range up to supply rails, eliminating need for external clamping diodes while maintaining MUX-friendly operation and comparator-like open-loop functionality. Its differential input stage supports ±75 mA output drive and 1 nF capacitive load stability without isolation resistors.
It operates across ±1.35 V to ±20 V or 2.7 V to 40 V single-supply configurations, with robust EMIRR performance (>80 dB at 1 GHz), 130 dB CMRR at 40 V, and shutdown capability reducing quiescent current to 30–45 µA per amplifier-enabling low-power wake-up sensing in body electronics and infotainment systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7 V to 40 V (or ±1.35 V to ±20 V): supports direct integration into 12 V/24 V/48 V automotive power domains without level-shifting. |
| Input Offset Voltage | ±125 µV (typ), ±925 µV (max over –40°C to +125°C): enables <0.1% error in 100 mV full-scale current-sense applications. |
| Gain-Bandwidth Product | 4.5 MHz: sustains stable closed-loop gain ≥10 at 450 kHz for fast-response feedback in motor phase-current monitoring. |
| Slew Rate | 21 V/µs: ensures ≤2.5 µs settling to 0.01% for 10 V step inputs-critical for transient detection in OBC and wireless charging control loops. |
| Output Drive Capability | ±75 mA short-circuit current: drives 2 kΩ loads within 250 mV of rails at 40 V supply-supports direct interface to ADC reference buffers and analog multiplexers. |
| Input Voltage Noise | 10.8 nV/√Hz at 1 kHz and 1.8 µVPP (0.1–10 Hz): preserves SNR >100 dB in thermocouple and bridge sensor front ends. |
| CMRR | 130 dB (typ, 40 V supply): rejects battery ripple and switching noise in high-common-mode-voltage current sensing (e.g., >30 V common-mode). |
| Quiescent Current | 560 µA per amplifier (typ), 750 µA max over temperature: allows four-channel operation at <3 mA total-ideal for always-on ADAS subsystems. |
Pinout & Package
DYY package: 14-pin SOT-23, 4.2 mm × 3.26 mm footprint, optimized for space-constrained automotive modules with exposed pad for thermal relief.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1+, IN2+, IN3+, IN4+ | Noninverting input (ch. 1–4) | Accepts signals up to V– – 0.1 V and V+ + 0.1 V; enables true rail-to-rail common-mode operation for sensor biasing. |
| IN1–, IN2–, IN3–, IN4– | Inverting input (ch. 1–4) | Differential pair input with 6 Ω || 1 pF common-mode impedance-minimizes EMI-induced errors in noisy engine bays. |
| OUT1–OUT4 | Amplifier output (ch. 1–4) | Rail-to-rail swing with 5–250 mV headroom depending on load; drives 1 nF directly without oscillation. |
| V+ | Positive supply rail | Highest potential node; must be decoupled with ≥100 nF ceramic near pin 4 to suppress 40 V supply transients. |
| V– | Negative supply rail | Lowest potential node; serves as reference for all inputs and outputs-requires low-impedance ground plane connection. |
Key Features
| Feature | Design Value |
|---|---|
| MUX-friendly inputs | Operates with differential inputs up to supply rails and functions reliably in open-loop mode-eliminates need for external comparators in window-detection circuits. |
| High capacitive load drive | Stable with 1 nF loads without series isolation resistor-reduces BOM count and PCB area in multi-channel sensor hubs. |
| Robust EMIRR | Rejects >80 dB of RF interference up to 1 GHz-ensures signal integrity in radar and V2X co-location environments. |
| Low offset drift | ±0.3 µV/°C (typ) over –40°C to +125°C-maintains calibration stability across engine compartment thermal cycles. |
| Shutdown mode | Reduces per-amplifier IQ to 30–45 µA; enables selective channel disable in multi-sensor clusters to meet ASIL-B power budgets. |
| AEC-Q100 Grade 1 | Qualified from –40°C to +125°C ambient, HBM ESD Level 2A, CDM Level C6-meets functional safety requirements for powertrain and ADAS ECUs. |
Applications
| High-Side Current Sensing | ADAS Radar Signal Conditioning |
|---|---|
Use Scenario: Monitoring motor phase current in 48 V HEV inverters using shunt resistors placed between high-side switch and battery positive. IC Role / Device Role / Timing Role: Quad amplifier configures two channels for bidirectional current measurement and two for voltage monitoring with matched gain paths. Use Value: ±125 µV offset and 130 dB CMRR enable sub-1% error at 30 V common-mode voltage-critical for torque accuracy and fault detection. |
Use Scenario: Amplifying low-amplitude IF signals from 77 GHz radar receivers before digitization by high-speed ADCs. IC Role / Device Role / Timing Role: Single channel used as programmable-gain amplifier with 4.5 MHz bandwidth and 21 V/µs slew rate for pulse fidelity. Use Value: 10.8 nV/√Hz input noise and 0.00021% THD+N preserve dynamic range and spurious-free performance in FMCW chirp processing. |
| On-Board Charger (OBC) Control Loop | Automotive Infotainment Audio Preamp |
Use Scenario: Closed-loop regulation of DC-DC converter output in bidirectional OBCs, where precision voltage and current feedback are required. IC Role / Device Role / Timing Role: Dual amplifiers implement isolated voltage and current error amplifiers feeding PWM controller; third channel monitors temperature. Use Value: 40 V supply range and rail-to-rail I/O allow direct interface to 400 V bus-derived references-no auxiliary supplies needed. |
Use Scenario: Low-noise preamplification of microphone and line-level inputs in digital cockpit systems with wide ambient temperature range. IC Role / Device Role / Timing Role: One amplifier per channel in quad configuration provides gain, filtering, and level shifting before CODEC interface. Use Value: 1.8 µVPP 0.1–10 Hz noise and ±10 pA bias current prevent audible hiss and DC drift in Class-D amplifier inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage, low-drift op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM324BQDRQ1 | Lower GBW (1.2 MHz), higher offset (±3 mV), no rail-to-rail output, 36 V max supply | Cost-sensitive body electronics only; unsuitable for HEV current sensing or radar IF stages | Select only when precision and speed are secondary to BOM cost in non-safety-critical lighting modules. |
| OPA4197QDGKRQ1 | Higher precision (±5 µV offset), lower noise (5.5 nV/√Hz), same 40 V rating but 10 MHz GBW and 20 V/µs slew | Better for ultra-low-noise sensor nodes (e.g., optical encoders); higher power (750 µA per amp) | Prefer when SNR >110 dB is mandatory and thermal budget allows 3× higher IQ; not drop-in due to different pinout. |
Compared with LM324BQDRQ1, OPA4991QDYYRQ1 delivers 3.75× higher bandwidth and 24× lower offset for accurate current loop control; versus OPA4197QDGKRQ1, it trades 2.2× lower noise for 25% lower quiescent current and identical DYY package compatibility-making it optimal for thermally constrained quad-sensing nodes.
Availability
OPA4991QDYYRQ1 is available at Aetrix Electronics and suitable for HEV/EV inverter control, ADAS radar signal chains, and automotive infotainment audio subsystems requiring stable component supply across extended temperature and long production lifecycles.
Supply support for OPA4991QDYYRQ1 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 AEC-Q100 Grade 1 automotive signal conditioning-emphasizing DC precision, high-voltage operation, and robustness against EMI, thermal stress, and supply transients in powertrain and ADAS systems.
FAQ
What is the maximum capacitive load the OPA4991QDYYRQ1 can drive without compensation?
The OPA4991QDYYRQ1 is specified to drive up to 1000 pF capacitive load stably without external compensation, as confirmed in the Electrical Characteristics table and validated by phase margin >60° in Figure 5-29. This capability eliminates series isolation resistors in multi-channel sensor buffer designs, preserving signal integrity and reducing board space. The OPA4991QDYYRQ1 achieves this via internal slew-boost circuitry and optimized output stage damping.
Does the OPA4991QDYYRQ1 support true rail-to-rail input with common-mode voltage beyond the supply rails?
No-the OPA4991QDYYRQ1 supports rail-to-rail input with common-mode voltage ranging from (V–) – 0.1 V to (V+) + 0.1 V, as stated in Section 5.3 Recommended Operating Conditions. It does not support inputs beyond ±0.1 V outside the rails. However, its unique front-end architecture eliminates input protection diodes, preventing distortion during fast transients that would forward-bias conventional clamp diodes. This behavior is documented in Section 6.3.1 and Figure 6-1 of the OPA4991QDYYRQ1 datasheet.
What is the thermal resistance (RθJA) of the OPA4991QDYYRQ1 in the DYY package?
The junction-to-ambient thermal resistance (RθJA) for the OPA4991QDYYRQ1 in the 14-pin SOT-23 (DYY) package is 110.7°C/W, as specified in Table 5.6 Thermal Information for Quad Channel. This value assumes standard JEDEC 2-layer board conditions. For high-power operation, designers should use the lower RθJB (35.3°C/W) and ψJB (35.1°C/W) metrics to model heat transfer through the board, especially when leveraging the exposed pad for thermal relief in automotive modules.
Can the OPA4991QDYYRQ1 be used as a comparator without external hysteresis?
Yes-the OPA4991QDYYRQ1 is explicitly designed for MUX-friendly/comparator use, operating reliably in open-loop mode with differential inputs up to the supply rails. Its input stage avoids phase reversal (Figure 5-30) and exhibits fast overload recovery (<400 ns). However, for robust zero-crossing detection, external hysteresis is recommended to prevent chatter near threshold; the OPA4991QDYYRQ1's low input bias current (±10 pA) ensures minimal hysteresis network loading.
How does the OPA4991QDYYRQ1 perform in electromagnetic interference (EMI) environments like engine compartments?
The OPA4991QDYYRQ1 features robust electromagnetic interference rejection ratio (EMIRR) exceeding 80 dB up to 1 GHz, as shown in Figure 5-41. This is achieved through proprietary input-stage shielding and layout techniques that minimize RF rectification at the inputs. In practice, this enables reliable operation in proximity to ignition systems, DC-DC converters, and radar transceivers-verified by AEC-Q100 ESD testing (HBM Level 2A, CDM Level C6) and system-level EMC validation in TI reference designs.
OPA4991QDYYRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-14 Thin, SOT-23 Variant
- 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-SOT-23-THIN
OPA4991QDYYRQ1 FAQ
1.How can I place an order for OPA4991QDYYRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4991QDYYRQ1 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 OPA4991QDYYRQ1 reliable?
The price and inventory of OPA4991QDYYRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4991QDYYRQ1 is usually 5 days.
3.What payment methods are accepted for OPA4991QDYYRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4991QDYYRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4991QDYYRQ1?
OPA4991QDYYRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4991QDYYRQ1 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 OPA4991QDYYRQ1?
For technical support, including OPA4991QDYYRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4991QDYYRQ1 requirements.
6.How does Aetrix verify that OPA4991QDYYRQ1 is sourced from the original manufacturer or authorized distributors?
All OPA4991QDYYRQ1 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 OPA4991QDYYRQ1 meets industry standards.
7.What is the process for return or replacement of OPA4991QDYYRQ1?
All OPA4991QDYYRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with OPA4991QDYYRQ1, 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 OPA4991QDYYRQ1 part is unused and in its original packaging.
Return procedure for OPA4991QDYYRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA4991QDYYRQ1 Tags
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