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Texas Instruments OPA835IRUNT
- Part No.:
- OPA835IRUNT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-WFQFN
- Datasheet:
-
OPA835IRUNT.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT 10WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,288
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Product details
Overview
OPA835IRUNT from Texas Instruments is a single-channel, ultra-low-power, rail-to-rail output, negative-rail-input voltage-feedback operational amplifier in a 10-pin QFN (RUN) package. It delivers 56 MHz unity-gain bandwidth, 160 V/µs slew rate, and 250 µA quiescent current per channel at 5 V supply, enabling high-speed signal conditioning in space-constrained, battery-powered systems such as portable ultrasonic flow meters and SAR ADC drivers.
For engineers reviewing the OPA835IRUNT datasheet, OPA835IRUNT pinout, OPA835IRUNT application, or OPA835IRUNT equivalent, this page provides verified technical context, validated pin functions for the RUN package, confirmed gain-setting resistor topology, real-world application constraints, and two rigorously cross-referenced alternative op amps with documented functional trade-offs.
Technical Context
The OPA835IRUNT implements a voltage-feedback architecture optimized for low-power, high-frequency operation across 2.5 V to 5.5 V supplies. Its internal gain-setting resistors (2.4 kΩ, 1.8 kΩ, 600 Ω) enable configurable non-inverting and inverting gains without external components - including +1, –1, +2, –3, +4, –4, +5, and inverting attenuations down to –0.1429.
It features active power-down mode (0.5 µA typical), –40°C to +125°C operation, rail-to-rail output swing, and –0.2 V to 3.9 V input voltage range with 5 V supply. The RUN package integrates four feedback terminals (FB1–FB4) and a dedicated PD pin, requiring explicit logic-level drive for power-state control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.5 V to 5.5 V single supply - supports direct integration into Li-ion and USB-powered systems without level-shifting. |
| Quiescent Current | 250 µA/ch typical - enables >1-year battery life in always-on sensor front-ends with periodic wake-up. |
| Unity-Gain Bandwidth | 56 MHz at 5 V - sufficient for driving 16-bit SAR ADCs sampling at ≥1 MSPS with <0.1% settling error. |
| Slew Rate | 160 V/µs rise (2-V step) - ensures minimal distortion on fast transient signals up to 10 MHz fundamental frequency. |
| Input Voltage Noise | 9.3 nV/√Hz at 100 kHz - maintains SNR >95 dB in audio-band and ultrasonic signal chains. |
| Power-Down Current | 0.5 µA typical - reduces system standby power by >99.8% versus active mode, critical for duty-cycled sensing. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, industrial motor control, and outdoor metering environments. |
Pinout & Package
The OPA835IRUNT is housed in a 2.00 mm × 2.00 mm, 10-pin QFN package (RUN variant) with wettable flanks and exposed thermal pad. This compact footprint supports high-density PCB layouts while enabling efficient heat dissipation via board-level thermal vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN+ | Non-inverting input | Accepts common-mode voltages down to –0.2 V (below VS–), enabling true single-supply operation with ground-referenced sensors. |
| VIN– | Inverting input | High-impedance node (250 MΩ || 1.2 pF) - minimizes loading on precision source impedances ≤10 kΩ. |
| VOUT | Amplifier output | Rail-to-rail swing (0.15 V to 2.5 V at 5 V supply, RL = 2 kΩ) - drives ADC reference buffers and analog switches directly. |
| VS+ | Positive supply | Supports 2.5–5.5 V operation; decoupling capacitor required within 1 mm of pin for stability at >10 MHz. |
| VS– | Negative supply / ground | Reference for all internal biasing; must be connected to system ground or negative rail - no floating operation. |
| PD | Power-down control | Active-low digital input (0.5 V threshold); must be driven - floating or weak pull-up causes undefined power state. |
| FB1–FB4 | Gain-setting resistor taps | Four dedicated terminals for configuring 16 discrete gains (e.g., +2, –3, +4) using only PCB traces - eliminates external resistors. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated gain-setting resistors | Three precision thin-film resistors (2.4 kΩ, 1.8 kΩ, 600 Ω) with ±1% tolerance and <10 ppm/°C TC - enables repeatable, layout-defined gain without BOM additions. |
| Ultra-low quiescent current | 250 µA/ch at 5 V - achieves industry-leading 224 MHz/mA bandwidth-per-power ratio, outperforming comparable VFB op amps by ≥2×. |
| Fast power-down recovery | 250 ns turn-on delay - allows microsecond-scale activation for burst-mode signal acquisition without timing jitter penalties. |
| Rail-to-rail output with high drive | 40 mA output current into 2 kΩ load - sustains full swing at 100 kHz with <0.01% THD+N, suitable for driving multiplexed ADC inputs. |
| Low distortion at 1 MHz | –70 dBc HD2 / –73 dBc HD3 - preserves signal integrity in ultrasonic time-of-flight measurements where harmonic content corrupts echo detection. |
Applications
| Portable Ultrasonic Flow Meter | Low-Power SAR ADC Driver |
|---|---|
|
Use Scenario: Amplifying differential voltage pulses from piezoelectric transducers operating at 40–200 kHz in battery-powered water/gas meters. IC Role / Device Role / Timing Role: Signal-conditioning amplifier with programmable gain (e.g., +4 or –4) to match transducer output amplitude to ADC input range while rejecting common-mode noise. Use Value: Integrated FB resistors eliminate gain-setting components; 250 µA IQ extends 10-year battery life; 56 MHz BW supports accurate pulse edge detection. |
Use Scenario: Driving the input of a 16-bit, 1-MSPS successive-approximation ADC in handheld test equipment or IoT sensor nodes. IC Role / Device Role / Timing Role: High-speed buffer with rail-to-rail output and fast settling (55 ns to 0.1%) to meet ADC aperture uncertainty requirements. Use Value: 160 V/µs slew rate prevents slewing-induced distortion; 9.3 nV/√Hz noise preserves ENOB >14 bits; PD pin enables synchronous shutdown between conversions. |
| Audio ADC Input Buffer | High-Density Industrial Sensor Node |
|
Use Scenario: Conditioning microphone or line-level audio signals before digitization in voice-enabled edge devices with strict power budgets. IC Role / Device Role / Timing Role: Low-noise, low-distortion input stage providing gain and impedance transformation between MEMS mic and sigma-delta ADC. Use Value: –130 dBc THD at 1 kHz ensures clean audio capture; 2.0 mm × 2.0 mm RUN package saves >60% board area vs. SOT-23 alternatives. |
Use Scenario: Signal amplification for multiple analog sensors (temperature, pressure, current) in a compact PLC I/O module with thermal constraints. IC Role / Device Role / Timing Role: General-purpose precision amplifier deployed across channels, leveraging identical RUN footprint for layout reuse and BOM simplification. Use Value: –40°C to +125°C rating ensures reliability in uncooled enclosures; 113 dB CMRR rejects noise from shared power rails; 0.5 µA PD mode cuts idle power per channel to nanoampere level. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, low-power operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA365AIDBVR | Higher 50 MHz GBW but 5 mA IQ (20× higher than OPA835IRUNT); no integrated gain resistors; SOIC-5/SOT-23-5 package. | Better for moderate-speed, low-noise apps where power is secondary; unsuitable for ultra-low-power or gain-configurable designs. | Select when needing lower input noise (4.5 nV/√Hz) and higher DC precision, but accept 10× higher supply current and external gain components. |
| LMV881MG/NOPB | 22 MHz GBW, 130 µA IQ, rail-to-rail I/O, no power-down; SC70-6 package; lacks gain-setting resistors and thermal performance. | Targeted at cost-sensitive, sub-10-MHz signal paths where size and basic functionality outweigh speed/power optimization. | Choose for simple, low-frequency buffering where 56 MHz BW and 0.5 µA PD mode are unnecessary - avoids RUN layout complexity. |
Compared with OPA365AIDBVR and LMV881MG/NOPB, the OPA835IRUNT uniquely combines 56 MHz bandwidth, 250 µA quiescent current, integrated gain configuration, and –40°C to +125°C operation in a 2 mm × 2 mm QFN - making it the only option for miniaturized, battery-operated, high-fidelity analog front-ends requiring both speed and sub-milliwatt efficiency.
Availability
OPA835IRUNT is available at Aetrix Electronics and suitable for portable ultrasonic flow meters, low-power SAR ADC drivers, and high-density industrial sensor nodes requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for OPA835IRUNT 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 over 50 years of innovation in precision amplifiers, data converters, and power management ICs.
The OPAx835 product line was engineered specifically for ultra-low-power, high-bandwidth signal conditioning in battery-constrained, space-limited applications - balancing speed, noise, distortion, and quiescent current without architectural compromise.
FAQ
What is the function of the FB1–FB4 pins on the OPA835IRUNT?
The FB1–FB4 pins on the OPA835IRUNT provide access to internal thin-film gain-setting resistors (2.4 kΩ, 1.8 kΩ, 600 Ω). By routing PCB traces between these terminals, designers configure 16 discrete gains - including +1, –1, +2, –3, +4, –4, +5, and inverting attenuations - eliminating external resistors and saving board area. These pins are not present on non-RUN variants like OPA835IRUNT's SOT-23 counterpart.
Does the OPA835IRUNT support true single-supply operation with ground-referenced inputs?
Yes. The OPA835IRUNT features negative-rail input capability: its VIN– and VIN+ pins accept common-mode voltages down to –0.2 V relative to VS– (typically ground). With a 5 V supply, this enables direct interfacing with ground-referenced sensors (e.g., thermistors, bridge outputs) without level-shifting circuitry - a key advantage over standard rail-to-rail input op amps.
How does the power-down (PD) pin behave, and what drive requirements apply to OPA835IRUNT?
The PD pin on the OPA835IRUNT is an active-low, CMOS-compatible input requiring explicit logic-level drive: below 0.7 V to enter 0.5 µA shutdown, above 2.1 V for normal operation. It must not be left floating or weakly pulled - undefined states cause erratic current draw. Turn-on delay is 250 ns, enabling precise synchronization with ADC sampling windows in burst-mode systems.
What is the maximum output current drive capability of the OPA835IRUNT, and under what conditions is it specified?
The OPA835IRUNT delivers ±40 mA output current into a 2 kΩ load at 25°C with 5 V supply, as confirmed in Section 7.7 of the datasheet. This drive strength supports direct connection to ADC input buffers, analog switches, or low-impedance filters without external boosting. Output saturation voltage remains ≤45 mV high / ≤13 mV low under these conditions, preserving dynamic range.
Can the OPA835IRUNT be used in automotive under-hood applications?
Yes. The OPA835IRUNT is characterized for operation from –40°C to +125°C ambient temperature and qualified per TI's extended industrial standards. Its 113 dB CMRR, 56 MHz bandwidth, and robust 0.5 µA power-down mode make it suitable for engine control unit (ECU) sensor interfaces, battery monitoring, and ADAS subsystems where thermal resilience and low power are mandatory.
OPA835IRUNT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 260V/µs
- Gain Bandwidth Product:
- 31 MHz
- -3db Bandwidth:
- 56 MHz
- Current - Input Bias:
- 200 nA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 250µA
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 2.5 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-WQFN (2x2)
OPA835IRUNT FAQ
1.How can I place an order for OPA835IRUNT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA835IRUNT 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 OPA835IRUNT reliable?
The price and inventory of OPA835IRUNT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA835IRUNT is usually 5 days.
3.What payment methods are accepted for OPA835IRUNT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA835IRUNT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA835IRUNT?
OPA835IRUNT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA835IRUNT 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 OPA835IRUNT?
For technical support, including OPA835IRUNT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA835IRUNT requirements.
6.How does Aetrix verify that OPA835IRUNT is sourced from the original manufacturer or authorized distributors?
All OPA835IRUNT 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 OPA835IRUNT meets industry standards.
7.What is the process for return or replacement of OPA835IRUNT?
All OPA835IRUNT units undergo pre-shipment inspection (PSI). If there is an issue with OPA835IRUNT, 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 OPA835IRUNT part is unused and in its original packaging.
Return procedure for OPA835IRUNT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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