THS4531A - Ultra-Low-Power Fully Differential Amplifier | TI
MPN: THS4531A ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.56 | $25.60 |
| 100 | $2.28 | $228.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.82 | $1,820.00 |
Drop-in alternatives for THS4531A — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
THS4531
✅ Drop-In📋 Reference alternative (not in catalog)
THS4551
✅ Drop-In📋 Reference alternative (not in catalog)
THS4521
✅ Drop-In📋 Reference alternative (not in catalog)
ADA4932-1
✅ Drop-In📋 Reference alternative (not in catalog)
LMH6550
✅ Drop-In📋 Reference alternative (not in catalog)
THS4531A Maximum Ratings & Electrical Characteristics
| Number of Channels | 1 |
| Supply Voltage - Single | 2.5 V to 5.5 V |
| Supply Voltage - Dual | ±1.25 V to ±2.75 V |
| Quiescent Current | 250 µA |
| Bandwidth | 36 MHz (G=1) |
| Slew Rate | 200 V/µs |
| Input Voltage Noise | 10 nV/√Hz |
| Open-Loop Gain | 100 dB |
| CMRR | 100 dB |
| Offset Voltage | 100 µV (typical) |
| Output Type | Rail-to-Rail |
| Input Common-Mode Range | Below negative rail |
| Operating Temperature Range | -40°C to +125°C |
| Package | 8-SOIC |
| RoHS | Compliant |
THS4531A Pin Configuration
| Pin 1 | OUT- — Inverting output |
| Pin 2 | V- — Negative supply |
| Pin 3 | IN+ — Non-inverting input |
| Pin 4 | IN- — Inverting input |
| Pin 5 | VOCM — Output common-mode voltage control |
| Pin 6 | V+ — Positive supply |
| Pin 7 | OUT+ — Non-inverting output |
| Pin 8 | PD — Power down (active low) |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
THS4531A is suitable for 6 applications: ADC Driver, Battery-Powered Instrumentation, Portable Medical Devices, Single-Ended to Differential Conversion, High-Speed Data Acquisition, Industrial Sensor Conditioning.
ADC Driver
The THS4531A is ideal for driving high-resolution ADCs due to its fully differential output, which provides common-mode rejection and doubles the dynamic range. Its low noise (10nV/√Hz) and 36MHz bandwidth ensure accurate signal conversion. The output common-mode voltage can be set via the VOCM pin to match the ADC input range, simplifying interface design. In a typical SAR ADC application, the THS4531A converts a single-ended sensor signal to differential, improving noise immunity and reducing even-order harmonics.
Recommended
Battery-Powered Instrumentation
With a quiescent current of only 250µA, the THS4531A is perfect for battery-powered instruments such as portable multimeters, data loggers, and field transmitters. It operates from a 2.5V supply, allowing direct connection to a 3V battery. The rail-to-rail output maximizes dynamic range, and the input common-mode range below the negative rail enables ground-referenced sensor interfacing. This low power consumption extends battery life, making it ideal for remote monitoring applications.
Recommended
Portable Medical Devices
The THS4531A's low power and small footprint make it suitable for portable medical devices like ECG monitors, pulse oximeters, and glucose meters. Its low noise (10nV/√Hz) ensures accurate biopotential signal amplification. The fully differential output rejects common-mode interference from the body, improving signal quality. The device operates from a single 3.3V supply, simplifying power design in battery-operated medical equipment.
Recommended
Single-Ended to Differential Conversion
The THS4531A can convert a single-ended signal to a differential output, which is useful for driving differential ADCs or transmitting signals over twisted-pair cables. Its input common-mode range below the negative rail allows direct connection to ground-referenced sensors. The device provides a balanced output that rejects common-mode noise, improving signal integrity in noisy industrial environments. This application is common in motor control and power monitoring systems.
Recommended
High-Speed Data Acquisition
With a 36MHz bandwidth and 200V/µs slew rate, the THS4531A is suitable for high-speed data acquisition systems, such as those used in test and measurement equipment. It can drive high-speed ADCs with minimal settling time, ensuring accurate capture of fast transients. The low power consumption allows high channel density in multi-channel systems. The device's rail-to-rail output maximizes the ADC input range, improving resolution.
Recommended
Industrial Sensor Conditioning
The THS4531A is used in industrial sensor conditioning, such as pressure, temperature, and strain gauge interfaces. Its low offset voltage (100µV) and high CMRR (100dB) ensure accurate measurement of small sensor signals. The input common-mode range below the negative rail allows direct connection to sensors referenced to ground. The device operates over -40°C to +125°C, making it suitable for harsh industrial environments.
Recommended
Recommended Products Summary
Engineering reference data for THS4531A — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | THS4531 | THS4551 | THS4521 | ADA4932-1 |
|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Supply Voltage Range | 2.5V to 5.5V | 2.5V to 5.5V | 2.5V to 5.5V | 2.5V to 5.5V | 3V to 5V |
| Quiescent Current | 250 µA | 250 µA | 1.35 mA | 1.1 mA | 1.4 mA |
| Bandwidth | 36 MHz | 36 MHz | 150 MHz | 95 MHz | 560 MHz |
| Slew Rate | 200 V/µs | 200 V/µs | 220 V/µs | 490 V/µs | 2800 V/µs |
| Input Voltage Noise | 10 nV/√Hz | 10 nV/√Hz | 3.3 nV/√Hz | 4.6 nV/√Hz | 1.6 nV/√Hz |
| Offset Voltage | 100 µV | 100 µV | 50 µV | 100 µV | 100 µV |
Key Differentiators
- Ultra-low quiescent current of 250µA (vs THS4551)
- Input common-mode range below negative rail (vs ADA4932-1)
- Rail-to-rail output (vs THS4521)
Design Notes
The THS4531A operates from 2.5V to 5.5V single supply or ±1.25V to ±2.75V dual supply. Ensure adequate decoupling with 0.1µF capacitors close to the V+ and V- pins. For single-supply operation, the input common-mode range below the negative rail allows direct connection to ground-referenced sensors, but the output swing is limited by the rail-to-rail output stage.
For optimal performance, place the THS4531A close to the ADC it drives to minimize trace length and parasitic capacitance. Use a solid ground plane and route differential traces symmetrically. The feedback resistors should be matched to 1% tolerance to maintain CMRR. Add a small capacitor (e.g., 10pF) across the feedback resistors to limit bandwidth and reduce noise.
Do not leave the PD (power down) pin floating; connect it to V+ for normal operation or to ground to disable the device. The VOCM pin sets the output common-mode voltage; if left floating, it defaults to mid-supply. Ensure the feedback network is balanced to avoid common-mode errors. Also, avoid driving capacitive loads greater than 100pF without a series resistor to prevent oscillation.
Compliance Information
RoHS compliant per TI product page. Not AEC-Q100 qualified.
