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Home > Products > Integrated Circuits (ICs) > Linear > Instrumentation, Op Amps, Buffer Amps

Texas Instruments INA157U/2K5

Name: INA157U/2K5
Brand: Texas Instruments
SKU: INA157U/2K5
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: INA157U/2K5

Manufacturer:: Texas Instruments

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: INA157U/2K5.pdf

Description:: IC OPAMP DIFF 1 CIRCUIT 8SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

INA157U/2K5 from Texas Instruments (formerly Burr-Brown) is a high-speed, precision difference amplifier with fixed G = 1/2 or G = 2 gain, ±500 µV max offset voltage, 3 MHz bandwidth, and ±4 V to ±18 V dual-supply operation. It integrates laser-trimmed thin-film resistors for accurate gain and >96 dB CMRR, enabling rail-to-rail common-mode input voltage measurement in industrial current shunt monitoring and instrumentation amplifier building blocks.

For engineers reviewing the INA157U/2K5 datasheet, INA157U/2K5 pinout, INA157U/2K5 application, or INA157U/2K5 equivalent, this device is selected for high-accuracy differential signal conditioning where low drift (±2 µV/°C), fast settling (3 µs to 0.01%), and wide supply range are critical - especially in ground-loop elimination and voltage-controlled current source designs requiring SO-8 surface-mount packaging.

Technical Context

The INA157U/2K5 implements a monolithic difference amplifier architecture with on-chip 6 kΩ and 12 kΩ laser-trimmed resistor networks matched for <0.05% gain error and excellent TCR tracking. Its input stage supports common-mode voltages beyond rails (e.g., up to 3×V+ − 7.5 V), enabling direct measurement of high-side shunt voltages without level-shifting circuitry.

It operates as a unity-gain-configurable block: G = 1/2 by default (pins 2/3 → output via internal ratio), reconfigurable to G = 2 by swapping external connections per Figure 2. The reference pin (Pin 1) allows output-level shifting and offset trimming, while the SO-8 package includes two NC pins (Pins 4 and 5) confirmed in top-view pinout documentation.

Key Specifications

Parameter	Value and Actual Design Meaning
Gain Accuracy	±0.05% max initial error - ensures <1 mV absolute error at 10 V output for precision current sensing.
Offset Voltage	±500 µV max - enables sub-millivolt DC measurement resolution in shunt-based systems.
CMRR	96 dB min at DC - rejects >99.998% of common-mode noise in noisy industrial environments.
Small-Signal Bandwidth	3 MHz (–3 dB) - supports accurate amplification of signals up to ~1.9 MHz with <3% gain error.
Slew Rate	14 V/µs - delivers full-scale step response within 1.4 µs for 20 Vpp transitions, critical for pulse monitoring.
Input Common-Mode Range	3×V+ − 7.5 V to 3×V− + 7.5 V - measures differential signals exceeding supply rails (e.g., +30 V common-mode on ±15 V supplies).
Quiescent Current	±2.4 mA - enables low-power operation in battery-backed or thermally constrained instrumentation.

Pinout & Package

INA157U/2K5 is housed in an SOIC-8 (SO-8) surface-mount package (TI drawing D, ΘJA = 150°C/W), compatible with standard 1.27 mm pitch PCB assembly processes and JEDEC Level-3 moisture sensitivity handling.

Pin/Terminal	Circuit Role	Design Meaning
1 (Ref)	Output Reference	DC bias point for output; voltage applied here sums directly with amplified differential signal - used for offset nulling or level-shifting.
2 (–In)	Inverting Input	High-impedance node for negative-side differential input; requires matched source impedance to Pin 3 for optimal CMRR.
3 (+In)	Non-inverting Input	High-impedance node for positive-side differential input; paired with Pin 2 to define differential input path.
4 (NC)	No Connection	Internally unconnected; must remain floating - no routing or grounding permitted.
5 (NC)	No Connection	Internally unconnected; must remain floating - no routing or grounding permitted.
6 (V+)	Positive Supply	Accepts +4 V to +18 V; decoupling capacitor required near pin for stability under dynamic load.
7 (Output)	Differential Output	Single-ended output referenced to Pin 1; drives loads up to ±60 mA with ±14 V swing on ±15 V supplies.
8 (V–)	Negative Supply	Accepts –4 V to –18 V; symmetric decoupling required with Pin 6 to suppress PSRR-induced errors.

Key Features

Feature	Design Value
Laser-trimmed resistor network	Enables 0.05% gain accuracy and <10 ppm/°C gain drift - eliminates need for external precision resistors in G = 1/2 or G = 2 configurations.
Rail-to-rail input common-mode range extension	Supports measurement of differential signals with common-mode voltages up to 3× supply rail - enables direct high-side current sensing without auxiliary op amps.
Low offset drift (±2 µV/°C)	Maintains calibration stability over –40°C to +85°C industrial temperature range - reduces thermal recalibration frequency in field-deployed equipment.
Fast 0.01% settling (3 µs)	Meets timing requirements for multiplexed data acquisition systems sampling at ≥100 kSPS with multi-channel switching.
SO-8 package with NC pins clearly defined	Reduces layout ambiguity: Pins 4 and 5 are confirmed NC in all official TI and legacy Burr-Brown documentation - prevents accidental connection errors.

Applications

Current Shunt Monitor	Ground Loop Eliminator
Use Scenario: Measuring bidirectional current in motor control inverters using a 1 mΩ shunt resistor placed between phase leg and DC bus. IC Role / Device Role / Timing Role: Difference amplifier configured for G = 2 to resolve ±100 mV shunt voltage into ±200 mV output, referenced to system ground via Pin 1. Use Value: Achieves ±0.1% full-scale accuracy over temperature without external gain-setting resistors, reducing BOM count and layout area.	Use Scenario: Isolating analog sensor signals (e.g., thermocouple outputs) from noisy PLC backplanes in factory automation cabinets. IC Role / Device Role / Timing Role: Differential receiver rejecting common-mode noise induced across long cable runs between isolated sensor and controller grounds. Use Value: 96 dB CMRR suppresses >99.998% of 50/60 Hz ground-borne interference, eliminating need for expensive isolation amplifiers.
Voltage-Controlled Current Source	Instrumentation Amplifier Building Block
Use Scenario: Generating precise 4–20 mA loop current from a 0–5 V DAC output in process transmitter modules. IC Role / Device Role / Timing Role: G = 1/2 amplifier converting DAC voltage to differential command signal driving an external op amp and MOSFET current sink. Use Value: Laser-trimmed gain ensures <0.05% linearity error across full 0–5 V range, meeting HART protocol accuracy requirements.	Use Scenario: Constructing a 3-op-amp instrumentation amplifier with programmable gain and ultra-low input bias current. IC Role / Device Role / Timing Role: Precision difference amplifier stage accepting buffered differential inputs from first-stage op amps (e.g., OPA227). Use Value: Integrated resistor matching eliminates inter-stage gain error accumulation, improving overall system gain accuracy to ±0.1%.

Current Shunt Monitor

Ground Loop Eliminator

Use Scenario: Measuring bidirectional current in motor control inverters using a 1 mΩ shunt resistor placed between phase leg and DC bus.

IC Role / Device Role / Timing Role: Difference amplifier configured for G = 2 to resolve ±100 mV shunt voltage into ±200 mV output, referenced to system ground via Pin 1.

Use Value: Achieves ±0.1% full-scale accuracy over temperature without external gain-setting resistors, reducing BOM count and layout area.

Use Scenario: Isolating analog sensor signals (e.g., thermocouple outputs) from noisy PLC backplanes in factory automation cabinets.

IC Role / Device Role / Timing Role: Differential receiver rejecting common-mode noise induced across long cable runs between isolated sensor and controller grounds.

Use Value: 96 dB CMRR suppresses >99.998% of 50/60 Hz ground-borne interference, eliminating need for expensive isolation amplifiers.

Voltage-Controlled Current Source

Instrumentation Amplifier Building Block

Use Scenario: Generating precise 4–20 mA loop current from a 0–5 V DAC output in process transmitter modules.

IC Role / Device Role / Timing Role: G = 1/2 amplifier converting DAC voltage to differential command signal driving an external op amp and MOSFET current sink.

Use Value: Laser-trimmed gain ensures <0.05% linearity error across full 0–5 V range, meeting HART protocol accuracy requirements.

Use Scenario: Constructing a 3-op-amp instrumentation amplifier with programmable gain and ultra-low input bias current.

IC Role / Device Role / Timing Role: Precision difference amplifier stage accepting buffered differential inputs from first-stage op amps (e.g., OPA227).

Use Value: Integrated resistor matching eliminates inter-stage gain error accumulation, improving overall system gain accuracy to ±0.1%.

Equivalent & Alternatives

The following parts are listed as comparable options for similar difference amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
INA154UA/2K5	G = 1 only; ±250 µV max offset; same SO-8 package and pinout.	Used where unity-gain differential buffering is required without gain scaling.	Select when G = 1 is mandatory and lower offset is prioritized over configurable gain.
AD8271ARMZ-REEL	G = 0.2 to 10 (pin-strappable); ±350 µV max offset; 10 MHz bandwidth; MSOP-8 package.	Preferred for variable-gain systems needing higher speed and smaller footprint.	Choose when design requires programmable gain or >3 MHz bandwidth, accepting MSOP-8 reflow profile differences.

Compared with INA157U/2K5, INA154UA/2K5 offers tighter offset but lacks G = 2 capability, while AD8271ARMZ-REEL provides wider gain range and speed at the cost of different package and layout compatibility - making INA157U/2K5 optimal for fixed-ratio, SO-8-based industrial signal chains demanding proven reliability and rail-overlapping input range.

Availability

INA157U/2K5 is available at Aetrix Electronics and suitable for current shunt monitoring, ground loop elimination, voltage-controlled current sources, and instrumentation amplifier building block applications requiring stable component supply, long-term industrial temperature support (–40°C to +85°C), and SO-8 tape-and-reel logistics.

Supply support for INA157U/2K5 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 acquired Burr-Brown in 2000 and maintains its precision analog portfolio, emphasizing high-accuracy signal conditioning ICs for industrial, test, and measurement markets.

The INA157U/2K5 belongs to TI's legacy difference amplifier product line, designed specifically for high-fidelity differential signal acquisition in harsh environments where rail-overlapping input range, low drift, and integrated resistor matching are essential.

FAQ

What is the function of Pin 1 (Ref) on the INA157U/2K5?

Pin 1 (Ref) sets the output reference voltage for the INA157U/2K5. The output voltage is defined as V_OUT = G × (V_+In – V_–In) + V_REF. Applying a DC voltage to this pin directly offsets the output - for example, grounding it yields output centered at 0 V, while applying +2.5 V shifts the entire output range upward by that amount. This feature enables flexible level-shifting and active offset trimming in precision systems using the INA157U/2K5.

Can the INA157U/2K5 be used with single-supply operation?

No - the INA157U/2K5 is specified exclusively for dual-supply operation from ±4 V to ±18 V. Its internal architecture requires symmetrical positive and negative rails to bias the precision op amp core and resistor network correctly. Attempting single-supply use (e.g., 0 V and +15 V) violates absolute maximum ratings and will result in undefined output behavior or damage. For single-supply difference amplification, consider TI's INA333 or ADI's AD827x family instead of the INA157U/2K5.

What is the maximum capacitive load the INA157U/2K5 can drive stably?

The INA157U/2K5 is characterized for stable operation with up to 500 pF capacitive load, as confirmed in the "Capacitive Load (stable operation)" specification (500 pF). Driving larger loads may cause peaking or oscillation due to phase margin degradation. If higher capacitance is unavoidable (e.g., long PCB traces or cable capacitance), add a small series resistor (10–50 Ω) between the output (Pin 7) and the load to isolate the capacitance - a technique validated in TI's application notes for the INA157U/2K5.

How does the INA157U/2K5 achieve rail-to-rail input common-mode voltage range?

The INA157U/2K5 achieves extended input common-mode range (up to 3×V+ − 7.5 V and 3×V− + 7.5 V) through proprietary input stage design that allows differential pair transistors to operate with base-emitter or gate-source voltages beyond conventional supply limits. This enables direct measurement of high-side shunt voltages - for example, sensing current in a +24 V rail using ±15 V supplies - without external level-shifting components. This capability is intrinsic to the INA157U/2K5 silicon and verified across temperature in production testing.

Is the INA157U/2K5 pin-compatible with the INA157UA/2K5?

Yes - the INA157U/2K5 and INA157UA/2K5 share identical SOIC-8 pinout, electrical specifications, and package dimensions. The "A" suffix denotes enhanced ESD protection (HBM ≥ 2 kV vs. standard ≥ 1.5 kV) and tighter initial offset distribution (±100 µV typical vs. ±250 µV), but all pin functions, terminal assignments, and PCB footprints are fully interchangeable. Designs qualified with INA157U/2K5 can migrate to INA157UA/2K5 without layout changes.

INA157U/2K5 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

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

INA157U/2K5 FAQ

1.How can I place an order for INA157U/2K5 through Aetrix?

Please submit a Request for Quotation (RFQ) for INA157U/2K5 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 INA157U/2K5 reliable?

The price and inventory of INA157U/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA157U/2K5 is usually 5 days.

3.What payment methods are accepted for INA157U/2K5?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA157U/2K5 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for INA157U/2K5?

INA157U/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your INA157U/2K5 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 INA157U/2K5?

For technical support, including INA157U/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA157U/2K5 requirements.

6.How does Aetrix verify that INA157U/2K5 is sourced from the original manufacturer or authorized distributors?

All INA157U/2K5 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 INA157U/2K5 meets industry standards.

7.What is the process for return or replacement of INA157U/2K5?

All INA157U/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with INA157U/2K5, 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 INA157U/2K5 part is unused and in its original packaging.

Return procedure for INA157U/2K5:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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