INA154UA - 3.1MHz Precision Difference Amplifier | Texas Instruments
MPN: INA154UA ✓ ActiveINA154UA Overview
A difference amplifier is an amplifier type that subtracts two input voltages and amplifies the resulting differential signal. The INA154 integrates a precision operational amplifier with a laser-trimmed resistor network, implementing the differential function without requiring an external precision resistor network. It belongs to the broader instrumentation-amplifier and differential-amplifier category within analog signal-chain integrated circuits.
Key features include a fixed gain of 1 V/V, maximum input offset voltage of ±750 µV, maximum offset drift of ±2 µV/°C, maximum gain error of ±0.05%, and wide bandwidth of approximately 3 MHz. The device is intended for low-cost, precision differential signal conditioning where the input signal is small relative to the common-mode voltage.
The INA154 combines an internal precision amplifier with an integrated, laser-trimmed resistor network. Its high-speed architecture supports signals extending to megahertz frequencies, while the fixed unity gain simplifies system design. Common-mode rejection is valuable in sensor interfaces, industrial measurement systems, and instrumentation applications where unwanted common-mode noise could otherwise obscure the desired differential signal.
Typical applications include current sensing, sensor signal conditioning, bridge amplifier inputs, industrial process measurement, and differential communication interfaces. The 8-pin SOIC package makes the device suitable for compact analog boards, provided the designer follows the manufacturer’s recommended input network, supply bypassing, and grounding guidance.
The primary design consideration is common-mode voltage and input range. The amplifier’s differential output responds to the difference between the two inputs, but the applied voltages must remain within the device’s permitted operating and common-mode limits. Decoupling capacitors should be placed close to the supply pins, and sensitive analog routing should minimize differential pickup between the input traces.
This page consolidates the verified manufacturer and distributor information, distinguishes the fixed-gain INA154UA from general-purpose op-amp alternatives, and highlights package, temperature, offset, bandwidth, and sourcing details useful during component selection.
Drop-in alternatives for INA154UA — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with INA154UA (same form factor and footprint) — differing in Bandwidth, Gain, Product Type, Slew Rate.
INA154UAG4
✅ Drop-In📋 Reference alternative (not in catalog)
INA154UA
✅ Drop-InContact for price
View Datasheet →INA154UA Maximum Ratings & Electrical Characteristics
| Product Type | High-speed precision difference amplifier |
| Gain | 1 V/V |
| Bandwidth | 3.1 MHz |
| Slew Rate | 14 V/µs |
| Input Offset Voltage | ±750 µV maximum |
| Input Offset Drift | ±2 µV/°C |
| Gain Error | ±0.05% maximum |
| Supply Voltage Range | 8 V to 36 V, or ±4 V to ±18 V |
| Operating Temperature Range | -40°C to +85°C |
| Number of Amplifiers | 1 |
| Package | 8-pin SOIC |
| Mounting Type | Surface mount |
| Differential Input | 2 input channels |
INA154UA 8-pin soic Pin Configuration Guide
Pin configuration for INA154UA (8-pin soic package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for INA154UA.
Refer to the datasheet for full pin configuration.
Typical Applications
INA154UA is suitable for 6 applications: Current Sensing, Industrial Sensor Signal Conditioning, Bridge Sensor Front End, Power Converter Feedback, Instrumentation and Test Equipment, Differential Communication Interface.
Current Sensing
The INA154UA fits low-side shunt measurement when the sensed differential voltage is small relative to the shunt common-mode voltage. Its unity gain of 1 V/V provides direct amplification without external gain-setting resistors, while ±750 µV maximum offset and ±0.05% maximum gain error support precision measurement. The 3.1 MHz bandwidth also allows transient content to pass. Designers must verify the common-mode limits, configure input filtering for shunt parasitics, and keep the differential input pair routed together to minimize pickup.
Recommended
Industrial Sensor Signal Conditioning
The INA154UA is useful for conditioning low-level differential sensor outputs in industrial equipment where a common-mode voltage can be much larger than the wanted signal. Its integrated precision resistor network avoids the external resistor matching normally required by a discrete difference amplifier. Fixed 1 V/V gain and 3.1 MHz bandwidth make the device suitable for moderate-speed process-control signals. The -40°C to +85°C industrial temperature range supports industrial environments, although grounding and enclosure noise still require careful PCB treatment.
Recommended
Bridge Sensor Front End
A bridge sensor produces a small differential voltage across its sensing element, making the INA154UA a candidate for bridge excitation monitoring where unity gain is acceptable. The fixed 1 V/V differential function removes the need for a matched four-resistor network, and the 3.1 MHz bandwidth accommodates excitation-related transients. However, bridge signals are often small, so system noise, input bias current, and the amplifier’s offset specifications must be included in the total error budget before selecting the device.
Recommended
Power Converter Feedback
The INA154UA can monitor differential feedback signals in power-converter and regulator control loops where fixed-gain measurement is sufficient. Its 14 V/µs slew rate and approximately 3.1 MHz bandwidth permit faster feedback-node changes than a slow precision-only amplifier, while the low-cost 8-pin SOIC package supports compact designs. Feedback traces should be kept short and away from switching nodes, because common-mode pickup can create measurement error even when the differential rejection is high.
Recommended
Instrumentation and Test Equipment
The INA154UA supports instrumentation front ends that must recover a small differential measurement from a larger common-mode signal. Its fixed 1 V/V gain simplifies calibration and the 3.1 MHz bandwidth is adequate for many general-purpose measurement paths. Precision is supported by ±750 µV maximum offset and ±0.05% maximum gain error. For high-accuracy instruments, engineers should include offset, drift, gain error, input impedance, and noise in the calibration model rather than relying on the bandwidth rating alone.
Recommended
Differential Communication Interface
The INA154UA can serve as the analog receiving stage for low-level differential communication when the receiver requires unity gain and moderate bandwidth. Its 3.1 MHz bandwidth and 14 V/µs slew rate provide margin above slower signal rates, while the internal resistor network implements the differential transfer function. The design must verify input voltage range, common-mode tolerance, and output drive into the following stage. Controlled impedance and matched routing are as important as the amplifier itself in differential communication links.
Recommended
Recommended Products Summary
Engineering reference data for INA154UA — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | INA154UAG4 | INA154UA |
|---|---|---|---|
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Function | Fixed-gain precision difference amplifier | Fixed-gain precision difference amplifier | Fixed-gain precision difference amplifier |
| Gain | 1 V/V | 1 V/V | 1 V/V |
Key Differentiators
- Integrated fixed-gain differential function (vs OPA37GU)
- Higher verified operating bandwidth for a difference amplifier (vs INA154UAG4)
- Low-cost fixed-gain solution (vs INA154UAG4)
Design Notes
Route the two INA154UA inputs as a closely matched differential pair and keep them away from switching nodes, inductors, and high-current return paths. Place the input network and any anti-alias components close to the amplifier pins. Because the device has fixed unity gain, there is no external feedback resistor to tune; PCB symmetry and grounding therefore have a direct effect on differential pickup and measurement accuracy.
Place supply-bypass capacitors immediately adjacent to the supply pins and use the shortest possible ground return. The verified supply range is 8 V to 36 V, or ±4 V to ±18 V. Before applying power, check input and output absolute-maximum limits in the manufacturer datasheet because the supplied excerpts do not include a complete common-mode range or absolute-maximum-rating table.
Do not treat a general-purpose precision op amp such as the OPA37GU as a pin-compatible substitute merely because both use an 8-pin SOIC package. The INA154UA implements a fixed 1 V/V differential function with an integrated resistor network. Also avoid assuming that an adjacent 8-pin op amp has the same pin functions, supply limits, common-mode range, or stability behavior. Verify the complete pin table and electrical characteristics before redesigning the footprint.
For current-shunt or sensor applications, evaluate input filtering against the INA154UA’s 3.1 MHz bandwidth. Excessive capacitance can add phase shift, while insufficient filtering can pass high-frequency noise. Include shunt inductance, sensor lead capacitance, amplifier input behavior, and source-imbalance effects in the simulation. The objective is to preserve useful signal bandwidth while keeping differential-input networks electrically balanced.
Compliance Information
The supplied excerpts do not provide explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations for INA154UA.