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Texas Instruments OPA1641AQDGKRQ1
- Part No.:
- OPA1641AQDGKRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
OPA1641AQDGKRQ1.pdf
- Description:
- IC AUDIO 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,388
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Product details
Overview
OPA1641AQDGKRQ1 from Texas Instruments is a single-channel, JFET-input, automotive-grade audio operational amplifier designed for high-fidelity signal conditioning in safety-critical analog front-ends. It delivers 5.1 nV/√Hz input voltage noise, 0.00005% THD+N at 1 kHz, 20 V/μs slew rate, rail-to-rail output swing, and operates from ±2.25 V to ±18 V supplies - enabling low-distortion pre-amplification in in-cabin microphone interfaces and ADAS sensor signal chains.
For engineers reviewing the OPA1641AQDGKRQ1 datasheet, OPA1641AQDGKRQ1 pinout, OPA1641AQDGKRQ1 application, or OPA1641AQDGKRQ1 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 audio system integration guidance - all extracted from TI's SBOS791A production datasheet.
Technical Context
The OPA1641AQDGKRQ1 uses a JFET-input stage with extremely stable input capacitance and no phase reversal under common-mode overdrive, ensuring robust behavior in high-impedance microphone or piezoelectric sensor interfaces. Its rail-to-rail output stage supports >3.5 VPP headroom into 2 kΩ loads at ±5 V supplies while maintaining <0.00005% THD+N.
Internally, it features unity-gain stability, 11 MHz gain-bandwidth product, and EMI rejection ratio (EMIRR IN+) of 86.8 dB at 2.4 GHz - critical for infotainment systems operating near Bluetooth/Wi-Fi bands. The device draws only 1.8 mA per channel quiescent current and withstands ±3000 V HBM ESD stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise Density | 5.1 nV/√Hz at 1 kHz - enables ultra-low-noise pre-amplification of weak microphone signals without degrading SNR |
| THD+N | 0.00005% at 1 kHz, 3 VRMS - meets studio-grade audio fidelity requirements for automotive cabin recording |
| Slew Rate | 20 V/μs - supports full-swing transient response up to 3.2 MHz without slew-induced distortion |
| Rail-to-Rail Output | VOUT = (V–) + 0.35 V to (V+) – 0.35 V at 2 kΩ - maximizes dynamic range in single-supply or split-supply audio stages |
| Supply Range | ±2.25 V to ±18 V (or 4.5 V to 36 V single) - accommodates wide battery voltage variation in HEV/EV power trains |
| AEC-Q100 Grade | Grade 1 (–40°C to +125°C ambient) - qualified for engine bay and ADAS ECU placement |
| EMIRR IN+ | 86.8 dB at 2.4 GHz - rejects Bluetooth/Wi-Fi interference in infotainment head units without external filtering |
Pinout & Package
OPA1641AQDGKRQ1 is packaged in an 8-pin VSSOP (DGK) with nominal body size 3.00 mm × 3.00 mm, optimized for space-constrained automotive PCB layouts and thermal performance (RθJA = 180°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No connection (NC) | Internally unconnected - must be left floating or tied to ground per layout best practices |
| 2 | Inverting input (–IN) | Differential input node; high-impedance JFET stage with ±2 pA bias current enables high-Z sensor interfacing |
| 3 | Noninverting input (+IN) | Primary signal input for unity-gain buffer or noninverting configurations; EMI-robust per EMIRR IN+ test |
| 4 | Negative supply (V–) | Lowest-potential rail; supports dual-supply operation down to –18 V or single-supply ground reference |
| 5 | No connection (NC) | Internally unconnected - no routing or termination required |
| 6 | Output (OUT) | Rail-to-rail capable output driving up to ±30 mA; includes internal short-circuit protection |
| 7 | Positive supply (V+) | Highest-potential rail; accepts up to +18 V in dual-supply mode or +36 V in single-supply mode |
| 8 | No connection (NC) | Internally unconnected - must remain unconnected per TI pin function table |
Key Features
| Feature | Design Value |
|---|---|
| No phase reversal | Prevents output polarity inversion during common-mode overdrive - essential for fault-tolerant microphone biasing circuits |
| Ultra-low THD+N | 0.00005% at 1 kHz ensures distortion remains below human auditory threshold in premium audio systems |
| EMI rejection at 2.4 GHz | 86.8 dB EMIRR IN+ eliminates need for external RF filters in Bluetooth-integrated infotainment modules |
| Automotive qualification | AEC-Q100 Grade 1, HBM ±3000 V, CDM ±1000 V - certified for deployment in safety-critical ADAS ECUs |
| Wide supply flexibility | Operates from ±2.25 V to ±18 V - supports both low-voltage microcontroller I/O domains and high-headroom audio rails |
Applications
| In-Cabin Microphone Array | ADAS Radar Signal Conditioning |
|---|---|
Use Scenario: Capturing occupant voice commands in noisy vehicle cabins with minimal acoustic processing latency. IC Role / Device Role / Timing Role: Low-noise pre-amplifier stage amplifying MEMS microphone output before ADC sampling. Use Value: 5.1 nV/√Hz noise floor preserves speech SNR across 20 Hz–20 kHz bandwidth, enabling accurate far-field voice recognition. |
Use Scenario: Amplifying weak intermediate-frequency (IF) signals from 77-GHz radar receivers before digitization. IC Role / Device Role / Timing Role: High-linearity IF buffer with rail-to-rail swing to maximize ADC dynamic range. Use Value: 0.00005% THD+N prevents harmonic folding into adjacent IF channels, maintaining radar object resolution. |
| Infotainment Head Unit Line-Out | HEV Battery Management Sensor Interface |
Use Scenario: Driving line-level analog outputs to external amplifiers or active speakers in premium audio systems. IC Role / Device Role / Timing Role: Unity-gain output buffer isolating DAC output from variable cable/load impedances. Use Value: 20 V/μs slew rate ensures full 2 VRMS swing at 20 kHz without slew-induced crossover distortion. |
Use Scenario: Conditioning voltage signals from isolated current shunt monitors in high-voltage battery packs. IC Role / Device Role / Timing Role: Precision gain stage converting mV-level shunt voltage to ADC-compatible levels. Use Value: ±2 pA input bias current minimizes offset error when interfacing with high-value precision shunts (e.g., 100 μΩ). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA1611AIDR | Lower noise (1.1 nV/√Hz), but not AEC-Q100 qualified; wider supply (±2.25 V to ±18 V); no EMI rejection spec | Targeted at industrial/test equipment, not automotive safety-critical use | Select only for non-automotive designs where ultra-low noise outweighs qualification requirements |
| LM4562MF/NOPB | Higher THD+N (0.00003% typ), AEC-Q100 not claimed; lower slew rate (20 V/μs same); no 2.4 GHz EMIRR data published | Used in consumer audio; lacks documented automotive reliability testing and EMI hardening | Consider for cost-sensitive non-safety infotainment subsystems where full AEC-Q100 traceability is not mandated |
Compared with OPA1641AQDGKRQ1, OPA1611AIDR offers superior noise performance but omits automotive qualification and EMI hardening, while LM4562MF/NOPB provides competitive THD+N at lower cost but lacks documented AEC-Q100 compliance and 2.4 GHz EMI immunity - making OPA1641AQDGKRQ1 the only option fully validated for ASIL-B-relevant signal chains.
Availability
OPA1641AQDGKRQ1 is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS sensor signal conditioning, in-cabin voice interface modules, and HEV/EV battery monitoring requiring stable component supply across extended temperature and lifecycle demands.
Supply support for OPA1641AQDGKRQ1 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 deep expertise in automotive-grade signal chain solutions and functional safety certification.
The OPA1641AQDGKRQ1 belongs to TI's SoundPlus™ automotive op amp family, engineered specifically for high-SNR, low-distortion audio signal paths in AEC-Q100-compliant vehicle systems - from microphone pre-amplification to radar IF conditioning.
FAQ
What is the maximum capacitive load the OPA1641AQDGKRQ1 can drive without instability?
The OPA1641AQDGKRQ1 maintains stability with up to 100 pF capacitive load when configured in unity-gain buffer mode, as verified by small-signal step response testing in TI's SBOS791A datasheet Figure 13. For loads exceeding 100 pF, external isolation resistance (e.g., 24 Ω series resistor) is recommended to preserve phase margin - a design consideration explicitly addressed in the device's typical characteristics section. This capability directly supports direct connection to long PCB traces or shielded cables in automotive microphone interfaces without added compensation networks.
Does the OPA1641AQDGKRQ1 support single-supply operation?
Yes, the OPA1641AQDGKRQ1 supports true single-supply operation from 4.5 V to 36 V, with specified performance across the full range. Its rail-to-rail output delivers (V–) + 0.35 V to (V+) – 0.35 V swing into 2 kΩ, and its input common-mode range extends to (V–) – 0.1 V, enabling operation with V– tied to ground. This is confirmed in Section 6.5 Electrical Characteristics and Recommended Operating Conditions of the SBOS791A datasheet - making OPA1641AQDGKRQ1 suitable for 5 V or 12 V automotive subsystems without dual-rail generation.
What AEC-Q100 stress tests has the OPA1641AQDGKRQ1 passed?
The OPA1641AQDGKRQ1 is qualified to AEC-Q100 Grade 1 with documented results for temperature cycling (–40°C to +125°C ambient), human-body model ESD (±3000 V), and charged-device model ESD (±1000 V). These results are explicitly listed in the Features section of the SBOS791A datasheet and verified through TI's production qualification process - confirming suitability for engine compartment and ADAS ECU placement where thermal and electrostatic robustness are mandatory.
How does the OPA1641AQDGKRQ1 handle input overvoltage beyond the common-mode range?
The OPA1641AQDGKRQ1 incorporates internal phase-reversal protection that prevents output polarity inversion when inputs exceed the linear common-mode range - instead clamping the output to the nearest rail. This behavior is demonstrated in Figure 29 of the SBOS791A datasheet and is a key differentiator from legacy JFET op amps. It ensures predictable failure modes in microphone bias circuits subjected to load dump or ESD transients, supporting functional safety goals in ASIL-B designs.
Is the OPA1641AQDGKRQ1 pin-compatible with other devices in the OPA164x-Q1 family?
Yes, the OPA1641AQDGKRQ1 shares identical 8-pin VSSOP (DGK) pinout with the dual-channel OPA1642AQDGKRQ1, enabling drop-in replacement in single-amplifier positions without PCB revision. Pin functions - including NC on pins 1, 5, and 8 - match exactly per Section 5 "Pin Configuration and Functions" in SBOS791A. This allows scalable design reuse across single, dual, and quad variants while maintaining layout compatibility and test fixture continuity.
OPA1641AQDGKRQ1 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:
- Audio
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 20V/µs
- Gain Bandwidth Product:
- 11 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 2 pA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 1.8mA
- Current - Output / Channel:
- 36 mA
- Voltage - Supply Span (Min):
- 4.5 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
OPA1641AQDGKRQ1 FAQ
1.How can I place an order for OPA1641AQDGKRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA1641AQDGKRQ1 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 OPA1641AQDGKRQ1 reliable?
The price and inventory of OPA1641AQDGKRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA1641AQDGKRQ1 is usually 5 days.
3.What payment methods are accepted for OPA1641AQDGKRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA1641AQDGKRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA1641AQDGKRQ1?
OPA1641AQDGKRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA1641AQDGKRQ1 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 OPA1641AQDGKRQ1?
For technical support, including OPA1641AQDGKRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA1641AQDGKRQ1 requirements.
6.How does Aetrix verify that OPA1641AQDGKRQ1 is sourced from the original manufacturer or authorized distributors?
All OPA1641AQDGKRQ1 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 OPA1641AQDGKRQ1 meets industry standards.
7.What is the process for return or replacement of OPA1641AQDGKRQ1?
All OPA1641AQDGKRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with OPA1641AQDGKRQ1, 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 OPA1641AQDGKRQ1 part is unused and in its original packaging.
Return procedure for OPA1641AQDGKRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA1641AQDGKRQ1 Tags
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