THS4032CD - 100MHz Dual Low-Noise Amplifier | Texas Instruments
MPN: THS4032CD ✓ ActiveTHS4032CD Overview
A voltage-feedback amplifier is a general-purpose analog building block that uses negative feedback to control gain and bandwidth. Within the broader operational-amplifier hierarchy, the THS4032 belongs to the low-noise, high-speed precision-amplifier class. Its dual configuration provides two amplifiers in one package, allowing designers to implement matching gain stages, differential circuits, filters, line drivers, or two independent channels while reducing board area.
The manufacturer datasheet identifies several performance characteristics suited to demanding analog front ends. The THS403x family offers 100 MHz bandwidth at a gain of 2, 100 V/us slew rate, and approximately 70 ns settling time. Input-voltage noise is 1.6 nV/sqrt(Hz), while typical input offset voltage is 0.5 mV. Distortion values cited in the family documentation include -72 dBc and -90 dBc under specified 1 MHz test conditions. The amplifier is stable in gains of -1 or greater.
The THS4032 is particularly useful for buffering analog-to-digital converters, processing communications signals, and amplifying low-level imaging waveforms. Its combination of bandwidth and low noise is valuable when a signal must retain both temporal fidelity and amplitude accuracy. The 8-pin SOIC package also supports conventional surface-mount assembly and prototyping workflows.
Designers should use the manufacturer datasheet for the exact input and output swing limits, supply-current behavior, electrical characteristics over temperature, pin assignments, and recommended operating conditions. Feedback-network values, source and load impedances, and PCB trace geometry can materially affect high-speed stability and distortion. Input and output paths should therefore be short, and sensitive inputs should be isolated from return currents and switching-node energy.
This product page consolidates manufacturer specifications, sourcing guidance, verified replacement candidates, and practical high-speed layout considerations into an engineering-focused reference for evaluating the THS4032CD in precision analog systems.
Drop-in alternatives for THS4032CD — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
THS4032IDR
✅ Drop-In📋 Reference alternative (not in catalog)
THS4032IDG4
✅ Drop-In📋 Reference alternative (not in catalog)
THS4032CD Maximum Ratings & Electrical Characteristics
| Amplifier Type | Voltage-feedback amplifier |
| Number of Channels | 2 channels |
| Gain Bandwidth Product | 100 MHz at G = 2 |
| Slew Rate | 100 V/us |
| Input Voltage Noise Density | 1.6 nV/sqrt(Hz) |
| Settling Time | 70 ns for 0% to 0.1% step response |
| Minimum Stable Gain | -1 V/V or greater |
| Typical Input Offset Voltage | 0.5 mV |
| Total Harmonic Distortion | -72 dBc at 1 MHz |
| Total Harmonic Distortion | -90 dBc at 1 MHz and 1 kohm load |
| Output Current | 90 mA |
| Maximum Supply Voltage | 16 V |
| Package | 8-pin SOIC |
| Mounting Type | Surface mount |
THS4032CD Pin Configuration
| Pin 1 | OUTA — Output of amplifier A |
| Pin 2 | -INA — Inverting input of amplifier A |
| Pin 3 | +INA — Noninverting input of amplifier A |
| Pin 4 | V- — Negative supply connection |
| Pin 5 | +INB — Noninverting input of amplifier B |
| Pin 6 | -INB — Inverting input of amplifier B |
| Pin 7 | OUTB — Output of amplifier B |
| Pin 8 | V+ — Positive supply connection |
Typical Applications
THS4032CD is suitable for 6 applications: High-Speed ADC Input Buffer, Communications Signal Conditioning, Imaging Signal Amplification, Low-Level Precision Instrumentation, Active Filtering and Frequency Shaping, Data-Acquisition Analog Front End.
High-Speed ADC Input Buffer
The THS4032CD fits between a high-speed analog source and a sampling ADC because its 100 MHz bandwidth at a gain of 2 accommodates signals whose frequency content extends well beyond conventional precision-amplifier bandwidth. Its 1.6 nV/sqrt(Hz) input-voltage noise helps limit amplifier-added noise, while the 100 V/us slew rate reduces distortion when large input steps require rapid settling. Each channel can buffer an independent converter input or provide gain for a single converter plus an auxiliary signal. Use short traces, close input resistors, and decoupling capacitors, and verify settling against the ADC acquisition window and source-impedance requirements.
Recommended
Communications Signal Conditioning
Communications front ends benefit from an amplifier that combines low input noise with sufficient closed-loop bandwidth to preserve signal shape. The THS4032CD offers 100 MHz bandwidth at a gain of 2, 100 V/us slew rate, and stable operation at gains of -1 or greater, allowing it to buffer, attenuate, or amplify intermediate-frequency and baseband waveforms. The dual 8-pin SOIC package supports two channels for differential signal chains. Keep input routing short and isolate the amplifier from high-energy switching paths. Distortion and settling should be checked at the actual signal amplitude, frequency, load, and gain because the quoted 1 MHz distortion values apply only to their specified test conditions.
Recommended
Imaging Signal Amplification
The THS4032CD is suitable for low-level imaging signal chains where the amplifier must add little voltage noise while processing waveforms over a comparatively wide frequency range. Its 1.6 nV/sqrt(Hz) input-voltage noise density and 100 MHz bandwidth at a gain of 2 provide a useful balance for sensor buffering and pre-amplification stages. The two channels can process related signals or provide independent amplification paths. For image arrays, maintain short sensor-to-amplifier routing, avoid coupling from digital control lines, and confirm the input common-mode range against the sensor bias. Stable feedback ratios and careful ground-return design are essential for consistent imaging performance.
Recommended
Low-Level Precision Instrumentation
Precision instrumentation benefits from the THS4032CD's low 1.6 nV/sqrt(Hz) input-voltage noise and typical 0.5 mV input offset specification. A gain of 2 provides 100 MHz bandwidth, so the device can amplify small sensor or laboratory signals without adopting the bandwidth limitations of a general-purpose precision op amp. The dual channel can support matched measurement paths, differential excitation, or two gain stages with similar electrical characteristics. Use low-noise feedback resistors, account for their thermal noise, and connect the negative supply pin to a clean analog ground return. The complete offset, drift, bias-current, and output-swing limits should be taken from the manufacturer datasheet for the selected temperature range.
Recommended
Active Filtering and Frequency Shaping
The THS4032CD can implement active filters and waveform-shaping networks because its 100 MHz gain-bandwidth performance at a gain of 2 provides useful bandwidth for signal frequencies well above audio range. Its 100 V/us slew rate helps preserve large or fast filter transitions, and the dual SOIC package permits two filter sections in a compact footprint. Component selection should account for the amplifier's noise and distortion across the complete passband and stopband. Keep feedback components close together, avoid excessive capacitive loading on the output, and verify stability using the manufacturer plots. For filters with very low corner frequencies, capacitor tolerances and resistor noise may dominate practical accuracy.
Recommended
Data-Acquisition Analog Front End
A data-acquisition front end often combines sensor buffering, gain, filtering, and conversion, and the THS4032CD can perform the low-noise buffering or gain function before an ADC. Its 1.6 nV/sqrt(Hz) input noise limits the noise introduced before conversion, while the 100 MHz bandwidth at gain 2 supports fast settling between multiplexed or differential channels. Two channels can buffer a differential pair, or one channel can provide gain while the other handles an auxiliary reference. Place the amplifier close to the ADC, use a continuous ground plane, and isolate the input path from digital return currents. Validate settling time, common-mode range, and output swing with the actual converter and acquisition timing.
Recommended
Recommended Products Summary
Engineering reference data for THS4032CD — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | THS4032IDR | THS4032IDG4 |
|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-pin SOIC | 8-pin SOIC - same package | 8-pin SOIC - same package |
| Number of Channels | 2 channels | 2 channels | 2 channels |
| Amplifier Architecture | Voltage feedback | Voltage feedback | Voltage feedback |
| Gain-Bandwidth Performance | 100 MHz at G = 2 | 100 MHz at G = 2 | 100 MHz at G = 2 |
| Slew Rate | 100 V/us | 100 V/us | 100 V/us |
| Input Voltage Noise Density | 1.6 nV/sqrt(Hz) | 1.6 nV/sqrt(Hz) | 1.6 nV/sqrt(Hz) |
| Typical Input Offset Voltage | 0.5 mV | 0.5 mV | 0.5 mV |
| Output Current | 90 mA | 90 mA | 90 mA |
Key Differentiators
- Combines low noise and high speed in two channels (vs THS4031CD)
- Maintains the same core AC performance across the identified ordering options (vs THS4032IDR)
- Supports stable operation at low gain (vs THS4032IDG4)
Design Notes
Keep the feedback resistors, input traces, and output traces physically short because the THS4032CD can operate with 100 MHz bandwidth. Route each feedback loop locally around the amplifier, avoid adding test pads or long branches between the input and output nodes, and place supply-bypass capacitors at the power pins. A continuous ground plane reduces return-path discontinuities, while separate analog and digital return currents help prevent switching noise from appearing at the sensitive input.
Use the manufacturer gain-versus-frequency and stability guidance when selecting feedback values, especially for noise gain of -1. Place resistance close to the relevant input pin and avoid excessive capacitive loading directly on the output. If a capacitive load must be driven, verify stability and step response with the final board layout. Probe points and long test leads can introduce parasitic capacitance, so compare measurements using short, controlled test connections.
Decouple each supply pin with low-inductance ceramic capacitance and provide adequate local energy for large output transitions. The 100 V/us slew rate can demand rapid current delivery from the supply network, so account for trace, capacitor, and regulator limitations when driving heavy loads. Connect the V- pin directly to the intended analog supply return rather than routing it through a long shared path. Confirm total supply voltage, output swing, and load-current limits against the manufacturer electrical-characteristics table.
Do not treat low voltage noise as the only noise contribution. Feedback resistors, source resistance, input bias current, and their temperature coefficients can dominate the total input-referred noise. Likewise, the quoted 100 MHz bandwidth and distortion figures apply to stated gain, frequency, load, and supply conditions. Evaluate the complete signal chain at the actual source impedance, output load, channel count, and board temperature rather than extrapolating a single headline specification.
Compliance Information
The exact environmental and qualification declarations for THS4032CD were not explicitly captured in the verified excerpts. Consult the Texas Instruments product compliance documentation before making a formal procurement claim.