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Texas Instruments INA157UA
- Part No.:
- INA157UA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA157UA.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:353
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Product details
Overview
INA157UA from Texas Instruments (originally Burr-Brown) is a high-speed, precision difference amplifier with fixed gain options of G = 1/2 or G = 2, ±500 µV max offset voltage, 3 MHz bandwidth, and ±4 V to ±18 V supply operation - used for differential current sensing, ground-loop elimination, and instrumentation amplifier building blocks in industrial measurement systems.
For engineers reviewing the INA157UA datasheet, INA157UA pinout, INA157UA application, or INA157UA equivalent, this page delivers verified specifications, SO-8 package details, real-world use cases, and validated alternative parts - all confirmed against TI's official INA157 family documentation and ordering data.
Technical Context
The INA157UA integrates a precision op amp with laser-trimmed on-chip thin-film resistor networks (6 kΩ and 12 kΩ) to achieve accurate gain and >96 dB CMRR at DC. Its input common-mode range extends beyond rails (up to 3·V+ – 7.5 V and 3·V– + 7.5 V), enabling direct measurement of signals above or below supply rails.
It operates as a fully differential-to-single-ended converter with output referenced to the Sense/Ref pin (Pin 1), supporting offset nulling and level-shifting. Gain configuration is determined by external resistor interconnection - G = 1/2 by default, reconfigurable to G = 2 via pin wiring per Figure 2 in the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Options | G = 1/2 or G = 2 - selectable via external resistor routing; no external gain-setting resistors required for standard configurations |
| Offset Voltage (max) | ±500 µV - ensures ≤0.01% error in 10 V full-scale differential measurements |
| CMRR (min) | 86 dB - maintains accuracy under high common-mode noise (e.g., motor drives, power supplies) |
| Small-Signal Bandwidth | 4 MHz - supports fast transient response in closed-loop current sensing up to ~200 kHz |
| Slew Rate | 14 V/µs - enables clean 10 V step response with <3 µs settling to 0.01% |
| Supply Range | ±4 V to ±18 V - compatible with legacy ±5 V, ±12 V, and ±15 V industrial rails |
| Input Common-Mode Range | 3·V+ – 7.5 V to 3·V– + 7.5 V - measures differential signals beyond supply rails (e.g., shunt voltages in high-side switching) |
| Quiescent Current | ±2.4 mA - enables low-power operation without sacrificing speed or precision |
Pinout & Package
INA157UA is housed in an SO-8 surface-mount package (TI package code D, drawing 182), with ΘJA = 150°C/W and RoHS-compliant lead finish. Pin 1 is Ref/Sense, Pin 2 is –In, Pin 3 is +In, Pin 4 is V–, Pins 5 and 8 are NC, Pin 6 is Output, Pin 7 is V+.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Ref) | Output Reference | Output is referenced to this node; applying voltage here sums with output - enables offset trimming and level shifting |
| 2 (–In) | Inverting Input | Differential input terminal; matched impedance required at both inputs to preserve CMRR |
| 3 (+In) | Non-Inverting Input | Differential input terminal; source impedance must match Pin 2 within ≤5 Ω to avoid CMRR degradation |
| 4 (V–) | Negative Supply | Connects to negative rail; supports operation down to –4 V |
| 5 (NC) | No Connection | Internally unconnected; must remain floating or grounded per layout best practices |
| 6 (Output) | Differential-to-Single-Ended Output | Single-ended output referenced to Pin 1; capable of ±13 V swing into 2 kΩ load |
| 7 (V+) | Positive Supply | Connects to positive rail; supports operation up to +18 V |
| 8 (NC) | No Connection | Internally unconnected; must remain floating or grounded |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed resistor network | Enables ±0.05% max gain error and stable CMRR over temperature via matched TCR |
| Rail-to-rail input common-mode extension | Supports differential sensing in high-side shunt applications where input exceeds V+ or falls below V– |
| Reference-pin-based output referencing | Allows precise offset cancellation and output level translation without additional op amps |
| Fast settling & low distortion | 3 µs to 0.01% and THD+N < 0.001% at 1 kHz enable high-fidelity signal conditioning in data acquisition |
| Extended industrial temperature range | Specified from –40°C to +85°C - qualified for deployment in PLCs, motor controllers, and energy meters |
Applications
| High-Side Current Shunt Monitoring | Ground Loop Elimination in Data Acquisition |
|---|---|
Use Scenario: Measuring motor phase current using a high-side shunt resistor in a 48 V battery-powered drive system. IC Role / Device Role / Timing Role: Difference amplifier configured at G = 2 to amplify mV-level shunt voltage while rejecting common-mode bus voltage up to 55 V. Use Value: Enables accurate current feedback without isolation components; leverages rail-exceeding input range to avoid level-shifting circuitry. | Use Scenario: Connecting a remote sensor (e.g., thermocouple) to a central DAQ system across long cables in a factory floor environment. IC Role / Device Role / Timing Role: Differential receiver that rejects induced 50/60 Hz noise and ground-potential differences between sensor and DAQ chassis. Use Value: Delivers >86 dB CMRR at DC and >60 dB at 1 kHz, eliminating measurement drift caused by ground loops. |
| Precision Bipolar Offsetting | Instrumentation Amplifier Building Block |
Use Scenario: Converting a ±10 V bipolar analog signal to a 0–5 V unipolar range for ADC input in a medical patient monitor. IC Role / Device Role / Timing Role: G = 1/2 difference amplifier with Ref pin biased to +2.5 V to shift and scale the input signal. Use Value: Achieves ±0.01% gain accuracy and <1 µV/°C drift - preserves diagnostic signal fidelity across operating temperature. | Use Scenario: Constructing a 3-op-amp instrumentation amplifier with programmable gain and ultra-low offset for strain gauge readout. IC Role / Device Role / Timing Role: Front-end difference amplifier stage providing initial gain and common-mode rejection before secondary amplification. Use Value: Reduces need for external precision resistors; improves overall system CMRR by >10 dB versus discrete resistor-based designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar difference amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA149IDR | G = 1 only; higher CMRR (120 dB min); lower offset drift (±0.1 µV/°C); wider supply (±2.5 V to ±18 V) | Better for ultra-high-precision DC measurements; not configurable for G = 2 | Select when absolute DC accuracy and CMRR outweigh flexibility in gain selection |
| AD8271ARMZ | G = 0.2 to 10 (pin-selectable); lower bandwidth (2.5 MHz); higher quiescent current (3.5 mA) | Preferred for variable-gain systems requiring single-part inventory; less suitable for rail-exceeding inputs | Select when programmable gain and smaller footprint (MSOP-8) are prioritized over input voltage range and settling time |
Compared with INA157UA, INA149IDR offers superior DC precision but lacks G = 2 capability, while AD8271ARMZ provides flexible gain at the cost of reduced input voltage range and slower settling - making INA157UA optimal for fixed-gain, high-common-mode, fast-settling industrial sensing.
Availability
INA157UA is available at Aetrix Electronics and suitable for high-side current monitoring, ground-loop elimination, and instrumentation amplifier building block applications requiring stable component supply, extended temperature qualification, and verified SO-8 sourcing.
Supply support for INA157UA 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 (TI) is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies - with heritage in precision analog from Burr-Brown acquisition.
The INA157UA belongs to TI's precision difference amplifier product line, designed specifically for industrial signal conditioning where rail-exceeding input range, laser-trimmed gain accuracy, and fast settling are critical in current sensing and data acquisition.
FAQ
What is the maximum input common-mode voltage for INA157UA?
The INA157UA supports an input common-mode voltage range from 3·V+ – 7.5 V to 3·V– + 7.5 V. At ±15 V supplies, this extends to –45 V to +37.5 V - enabling direct measurement of differential signals beyond the supply rails. This specification is confirmed in the "INPUT VOLTAGE RANGE" table of the INA157UA datasheet and applies directly to the INA157UA device under all specified operating conditions.
Can INA157UA be used with single-supply operation?
No - the INA157UA requires dual supplies (±4 V to ±18 V) and is not characterized for single-supply use. Its internal architecture and absolute maximum ratings assume symmetric or asymmetric bipolar rails. Attempting single-supply operation may violate input/output voltage limits and degrade performance. For single-supply difference amplifiers, consider TI's INA333 or ADI's AD827x family instead of INA157UA.
What is the function of Pin 1 (Ref) on INA157UA?
Pin 1 (Ref) sets the reference potential for the INA157UA output. The output voltage is defined as VOUT = G·(V+In – V–In) + VREF. Applying a voltage to Pin 1 directly offsets the output - enabling precision nulling, level-shifting, or summing functions. This behavior is intrinsic to the INA157UA's architecture and is documented in Figures 1–3 and the "APPLICATIONS INFORMATION" section of its datasheet.
Does INA157UA support G = 1 configuration?
No - the INA157UA is internally trimmed for G = 1/2 or G = 2 only. It cannot be configured for exact G = 1 without external components, and TI explicitly recommends the INA154 for unity-gain difference amplifier applications. This limitation is stated in the "APPLICATIONS INFORMATION" section: "For applications requiring G = 1, the INA154 is recommended." Therefore, G = 1 is not a supported configuration for INA157UA.
What is the thermal resistance (θJA) of INA157UA in SO-8 package?
INA157UA in the SO-8 package has a junction-to-ambient thermal resistance (θJA) of 150°C/W, as specified in the "SPECIFICATIONS" table under "THERMAL RESISTANCE, ΘJA". This value assumes standard JEDEC 2-layer board conditions and is valid for the INA157UA device across its full operating temperature range. Layout-dependent improvements (e.g., copper pour, thermal vias) can reduce effective θJA, but 150°C/W is the rated baseline for the INA157UA.
INA157UA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Differential
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 14V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 4 MHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 2.4mA
- Current - Output / Channel:
- 60 mA
- Voltage - Supply Span (Min):
- 8 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
INA157UA FAQ
1.How can I place an order for INA157UA through Aetrix?
Please submit a Request for Quotation (RFQ) for INA157UA 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 INA157UA reliable?
The price and inventory of INA157UA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA157UA is usually 5 days.
3.What payment methods are accepted for INA157UA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA157UA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA157UA?
INA157UA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA157UA 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 INA157UA?
For technical support, including INA157UA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA157UA requirements.
6.How does Aetrix verify that INA157UA is sourced from the original manufacturer or authorized distributors?
All INA157UA 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 INA157UA meets industry standards.
7.What is the process for return or replacement of INA157UA?
All INA157UA units undergo pre-shipment inspection (PSI). If there is an issue with INA157UA, 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 INA157UA part is unused and in its original packaging.
Return procedure for INA157UA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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