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Texas Instruments THS4531IRUNT
- Part No.:
- THS4531IRUNT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-WFQFN
- Datasheet:
-
THS4531IRUNT.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 10WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,098
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Product details
Overview
THS4531IRUNT from Texas Instruments is an ultra-low-power, fully-differential amplifier with rail-to-rail output and negative-rail input capability. It operates from 2.5 V to 5.5 V, draws only 250 µA quiescent current, delivers 36 MHz bandwidth and 200 V/µs slew rate, and supports precise output common-mode control-enabling direct DC-coupled interfacing to SAR and ΔΣ ADCs in battery-powered data acquisition systems.
For engineers reviewing the THS4531IRUNT datasheet, THS4531IRUNT pinout, THS4531IRUNT application, or THS4531IRUNT equivalent, this page provides verified specifications, WQFN-10 package details, differential driver use cases, power-down functionality, and validated alternative options for low-power, high-accuracy signal conditioning designs.
Technical Context
The THS4531IRUNT implements a fully-differential architecture with independent VOCM input for accurate output common-mode voltage setting-critical for matching ADC reference levels without AC coupling. Its input common-mode range extends 0.2 V below the negative rail (VS–), enabling single-ended ground-referenced source interfacing using only a single 2.5–5.5 V supply.
It integrates a dedicated power-down pin (PD) that reduces quiescent current to 0.5 µA typical while maintaining fast turn-on (600 ns) and turn-off (15 ns) timing. The device achieves –120 dBc THD at 1 kHz (1 VRMS) and 10 nV/√Hz input voltage noise, optimized for high-channel-count, thermally constrained systems operating from –40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.5 V to 5.5 V - supports single-supply operation in portable and industrial systems without dual-rail generation. |
| Quiescent Current | 250 µA - enables >10-year battery life in always-on sensor front-ends and IoT edge nodes. |
| Small-Signal Bandwidth | 36 MHz at VS = 5 V - sufficient for driving 16-bit+ SAR ADCs up to 1 MSPS with full settling. |
| Slew Rate | 220/390 V/µs (rise/fall) - ensures distortion-free amplification of fast transient signals in pulse-based measurement systems. |
| THD @ 1 kHz | –122 dBc - meets dynamic range requirements for audio-grade and precision instrumentation signal chains. |
| Input Voltage Noise | 10 nV/√Hz @ 1 kHz - preserves SNR in low-amplitude sensor interfaces such as strain gauges and piezoelectric transducers. |
| Power-Down Current | 0.5 µA typical - allows aggressive duty-cycling in energy-harvesting and wake-on-event architectures. |
Pinout & Package
THS4531IRUNT is housed in a 2.00 mm × 2.00 mm, 10-pin WQFN (RUN) package with wettable flanks, rated for –40°C to +125°C operation. Thermal resistance θJA is 163°C/W, supporting high-density PCB layouts without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT– | Inverted differential output | Provides complementary output path; must be terminated symmetrically with VOUT+ to preserve balance and CMRR. |
| NC (Pins 2, 8) | No internal connection | Not bonded; may be left floating or tied to ground for mechanical stability-no electrical function. |
| PD | Power-down enable | Logic-high (≥2.1 V) enables normal operation; logic-low (≤0.7 V) activates 0.5 µA standby mode. |
| VIN+ | Non-inverting input | Accepts single-ended or differential input; input common-mode range includes VS– – 0.2 V. |
| VS– | Negative supply rail | Reference for internal biasing; tied internally across channels in multi-device configurations. |
| VIN– | Inverting input | Feedback node in closed-loop configurations; used with RF to set gain in standard differential amplifier topology. |
| VOCM | Output common-mode voltage control | Directly programs output midpoint (e.g., 0.95–4.0 V at VS = 5 V); enables DC coupling to ADCs with arbitrary reference levels. |
| VOUT+ | Non-inverted differential output | Paired with VOUT– to deliver balanced signal; differential swing up to 2 VPP into 2 kΩ load. |
| VS+ | Positive supply rail | Supports up to 5.5 V; PSRR of 87–108 dB suppresses supply noise from affecting output accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Fully-differential architecture with VOCM control | Enables precise, DC-coupled interface to differential-input ADCs without level-shifting circuitry or AC coupling capacitors. |
| Rail-to-rail output + negative-rail input | Maximizes dynamic range from single 2.5–5.5 V supply; accepts inputs down to VS– – 0.2 V, simplifying sensor front-end design. |
| Ultra-low 250 µA quiescent current | Reduces self-heating in dense PCB layouts and extends battery life in portable medical and environmental monitoring devices. |
| 0.5 µA power-down mode | Allows microcontroller-gated operation in intermittent-sampling systems, cutting average system power by >99% during idle periods. |
| –122 dBc THD @ 1 kHz, 1 VRMS | Meets SFDR > 100 dB requirements for 16-bit+ data acquisition, ensuring minimal harmonic contamination in spectral analysis. |
| 10 nV/√Hz input voltage noise | Maintains signal integrity in low-level analog paths-critical for bridge sensor amplification and high-gain programmable gain stages. |
Applications
| Portable ECG Front-End | Multi-Channel Industrial DAQ |
|---|---|
|
Use Scenario: Amplifying microvolt-level biopotential signals from dry electrodes in battery-powered wearable ECG monitors. IC Role / Device Role / Timing Role: Single-ended to differential driver with VOCM-set output common-mode aligned to ADC reference, enabling DC-coupled baseline stability. Use Value: 250 µA supply current extends operating time beyond 7 days on a CR2032 coin cell; –122 dBc THD preserves diagnostic fidelity for ST-segment analysis. |
Use Scenario: Signal conditioning for 32-channel vibration sensor array in predictive maintenance gateway with thermal constraints. IC Role / Device Role / Timing Role: Low-power differential driver stage before multiplexed SAR ADC, leveraging PD pin for per-channel power gating. Use Value: 0.5 µA shutdown current per channel reduces total standby power by 16 µA/channel, critical for fanless enclosure thermal management. |
| Audio ADC Interface for Smart Speaker | Low-Power Precision Weigh Scale |
|
Use Scenario: Driving stereo 24-bit audio ADCs (e.g., PCM4204) in voice-assistant endpoints requiring low-noise microphone preamplification. IC Role / Device Role / Timing Role: Differential line driver with matched gain/phase response; VOCM configured to match ADC's internal reference. Use Value: 10 nV/√Hz input noise and –122 dBc THD ensure >110 dB SNR and <0.0008% THD+N, meeting far-field voice pickup requirements. |
Use Scenario: Conditioning mV-level outputs from load-cell bridges in battery-operated retail weighing terminals. IC Role / Device Role / Timing Role: Low-drift, rail-to-rail output amplifier with VOCM-adjusted common-mode to match 2.048 V ADC reference. Use Value: ±4 µV/°C VOS drift and 114 dB AOL maintain 20-bit effective resolution across –10°C to +50°C ambient temperature swings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fully-differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4521IDGKR | Higher 145 MHz bandwidth but 1.14 mA IQ - 4.6× higher supply current than THS4531IRUNT. | Better suited for high-speed communication links; less optimal for battery-constrained, low-frequency sensor signal chains. | Select when bandwidth >100 MHz is required and power budget allows ≥1 mA per channel. |
| THS4551IRGTR | 150 MHz bandwidth, –128 dBc THD at 1 kHz, 1.37 mA IQ, and 3.3 nV/√Hz noise - superior AC performance at higher power cost. | Preferred for high-resolution spectroscopy or wideband communications where SNR and speed outweigh power limits. | Choose when THD < –125 dBc and noise < 4 nV/√Hz are mandatory, and thermal headroom permits >1 mA per channel. |
Compared with THS4531IRUNT, THS4521IDGKR trades 4.6× higher quiescent current for 4× bandwidth, while THS4551IRGTR adds 5.5× power consumption to achieve 6 dB lower THD and 3× lower noise-making THS4531IRUNT the optimal choice for power-sensitive, sub-50 MHz precision signal conditioning.
Availability
THS4531IRUNT is available at Aetrix Electronics and suitable for portable medical devices, multi-channel industrial data loggers, smart audio endpoints, and low-power precision weighing systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for THS4531IRUNT 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, embedded processing, and connectivity technologies, with decades of expertise in high-precision, low-power signal chain solutions.
The THS4531IRUNT belongs to TI's ultra-low-power fully-differential amplifier product line, engineered specifically for DC-coupled, battery-operated data acquisition systems where power efficiency, thermal density, and ADC interface simplicity are primary design constraints.
FAQ
What is the maximum operating temperature range for the THS4531IRUNT?
The THS4531IRUNT is characterized for continuous operation from –40°C to +125°C ambient temperature, making it suitable for under-hood automotive sensors, industrial motor drives, and outdoor environmental monitoring equipment. This rating applies specifically to the WQFN-10 (RUN) package variant and is validated per TI's production test flow.
Does the THS4531IRUNT require external compensation components?
No, the THS4531IRUNT is internally compensated and stable for unity-gain (G = 1 V/V) operation with standard feedback networks. It maintains phase margin >60° into 2 kΩ loads without added capacitors or resistors-verified across voltage (2.5–5.5 V), temperature (–40°C to +125°C), and process corners per TI's SLOS358C datasheet.
Can the VOCM pin of the THS4531IRUNT be left unconnected?
No-leaving VOCM floating causes undefined output common-mode voltage and potential output saturation. The VOCM pin must be driven with a stable DC voltage (0.75–4.0 V at VS = 5 V) or connected to a resistor divider from VS+ and VS– to set the desired output midpoint, as specified in Section 6.1 and Table 3 of the THS4531IRUNT datasheet.
What is the small-signal bandwidth of the THS4531IRUNT at 5 V supply?
The THS4531IRUNT delivers 36 MHz small-signal bandwidth at VS = 5 V, G = 1 V/V, measured with 100 mVPP output into RL = 2 kΩ differential load. This value is confirmed in Table 5.4 (Electrical Characteristics: VS = 5 V) of the official TI datasheet SLOS358C, Revision C.
Is the THS4531IRUNT pin-compatible with other members of the THS45xx family?
No-the THS4531IRUNT uses a 10-pin WQFN (RUN) package with unique pinout (e.g., NC pins at 2/8, VOCM at Pin 7), differing from the 8-pin SOIC/VSSOP footprints of THS4521/THS4551. Direct PCB replacement is not possible; layout redesign is required for migration between package variants.
THS4531IRUNT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Differential
- Number of Circuits:
- 1
- Output Type:
- Differential, Rail-to-Rail
- Slew Rate:
- 390V/µs
- Gain Bandwidth Product:
- 27 MHz
- -3db Bandwidth:
- 36 MHz
- Current - Input Bias:
- 160 nA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 250µA
- Current - Output / Channel:
- 25 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)
THS4531IRUNT FAQ
1.How can I place an order for THS4531IRUNT through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4531IRUNT 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 THS4531IRUNT reliable?
The price and inventory of THS4531IRUNT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4531IRUNT is usually 5 days.
3.What payment methods are accepted for THS4531IRUNT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4531IRUNT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4531IRUNT?
THS4531IRUNT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4531IRUNT 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 THS4531IRUNT?
For technical support, including THS4531IRUNT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4531IRUNT requirements.
6.How does Aetrix verify that THS4531IRUNT is sourced from the original manufacturer or authorized distributors?
All THS4531IRUNT 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 THS4531IRUNT meets industry standards.
7.What is the process for return or replacement of THS4531IRUNT?
All THS4531IRUNT units undergo pre-shipment inspection (PSI). If there is an issue with THS4531IRUNT, 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 THS4531IRUNT part is unused and in its original packaging.
Return procedure for THS4531IRUNT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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