My Inquiry
My Account
Texas Instruments INA157UA/2K5
- Part No.:
- INA157UA/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA157UA/2K5.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,810
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
INA157UA/2K5 from Texas Instruments (formerly Burr-Brown) is a high-speed, precision difference amplifier with fixed gain options of G = 1/2 or G = 2, laser-trimmed resistor network, ±500µV max offset voltage, 3MHz bandwidth, and ±4V to ±18V dual-supply operation. It serves as a differential input stage in industrial instrumentation, current shunt monitoring, and ground-loop elimination circuits.
For engineers reviewing the INA157UA/2K5 datasheet, INA157UA/2K5 pinout, INA157UA/2K5 application, or INA157UA/2K5 equivalent, this page delivers verified specifications, SO-8 package layout, real-world use scenarios, and two validated alternative parts for design-in flexibility under extended industrial temperature conditions (–40°C to +85°C).
Technical Context
The INA157UA/2K5 integrates a precision op amp with on-chip, laser-trimmed thin-film resistors (6kΩ/12kΩ ratio) enabling accurate G = 1/2 or G = 2 configurations without external matching. Its input common-mode range extends beyond rails-up to 3•(V+) – 7.5V and 3•(V–) + 7.5V at ±15V supplies-supporting high-side sensing in motor control and power supply monitoring.
It features rail-to-output (RTO) capability, 14V/µs slew rate, and 3µs settling to 0.01% for fast transient response in closed-loop current feedback systems. Common-mode rejection remains ≥86dB over 0.1Hz–100kHz, maintained by matched TCR of internal resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Options | G = 1/2 or G = 2; selectable via external resistor reconfiguration per datasheet Figures 1 & 2 |
| Offset Voltage (max) | ±500 µV; ensures <0.01% error at 10V output scale in precision measurement front-ends |
| Bandwidth (–3dB) | 3 MHz; supports accurate amplification of fast differential signals up to ~1.9 MHz sine wave |
| Slew Rate | 14 V/µs; enables full-scale 20V step response within ≤1.5 µs without distortion |
| Supply Range | ±4 V to ±18 V; compatible with standard industrial dual-rail supplies including ±5V, ±12V, ±15V |
| CMRR (min) | 86 dB at DC–100 kHz; maintains signal integrity when rejecting noise on shared analog grounds |
| Quiescent Current | ±2.4 mA; enables low-power operation in battery-backed or thermally constrained modules |
Pinout & Package
INA157UA/2K5 is housed in an SO-8 surface-mount package (TI drawing D, JEDEC MS-012), with ΘJA = 150°C/W and RoHS-compliant lead finish. Pin 1 is Ref (output reference), Pin 2 is –In, Pin 3 is +In, Pin 4 is V–, Pin 5 is NC, Pin 6 is V+, Pin 7 is Output, Pin 8 is Sense - all confirmed per official TI datasheet SBOS105 and PDS-1483B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Ref) | Output Reference | Output voltage is referenced to this pin; applying voltage here offsets output linearly (e.g., for level-shifting or nulling) |
| 2 (–In) | Inverting Input | Differential input node; requires matched source impedance to Pin 3 for optimal CMRR |
| 3 (+In) | Non-Inverting Input | Differential input node; mismatch >5Ω vs Pin 2 degrades CMRR to ~77dB |
| 4 (V–) | Negative Supply | Connects to negative rail; supports operation down to –4V; absolute max VIN = ±80V |
| 5 (NC) | No Connection | Internally unconnected; must remain floating or grounded per layout best practice |
| 6 (V+) | Positive Supply | Connects to positive rail; supports operation up to +18V; supply rejection ≥100dB at 1kHz |
| 7 (Output) | Amplified Differential Output | Rail-to-output swing: (V+)–1.8V to (V–)+1.6V at ±15V; stable with ≤500pF capacitive load |
| 8 (Sense) | Internal Resistor Network Tap | Provides access to internal feedback node; used only in custom gain configurations per Figure 2 |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed resistor network | Enables ±0.05% max gain error and stable CMRR over temperature without external trimming |
| Rail-to-output (RTO) output stage | Delivers full dynamic range near supply rails-critical for ±10V data acquisition systems |
| Extended input common-mode range | Operates with inputs up to 3× supply voltage beyond rails-enables direct high-side current sensing |
| Low offset drift (±2 µV/°C) | Maintains calibration stability across –40°C to +85°C without active compensation circuitry |
| Fast 0.01% settling (3 µs) | Supports high-throughput sampling in automated test equipment and digital power metering |
Applications
| Current Shunt Monitoring | Differential Input Amplifier |
|---|---|
|
Use Scenario: Measuring bidirectional motor phase current using a 1mΩ shunt resistor in a 48V traction inverter. IC Role / Device Role / Timing Role: Difference amplifier configured at G = 2 to resolve ±50mV shunt voltage into ±100mV output, referenced to system ground. Use Value: Input common-mode range exceeds bus voltage by >20V, eliminating need for isolated amplifiers or level-shifters. |
Use Scenario: Conditioning differential sensor outputs (e.g., bridge-based pressure transducers) in HVAC control panels. IC Role / Device Role / Timing Role: Front-end G = 1/2 amplifier rejecting common-mode noise from long cable runs while preserving signal fidelity. Use Value: 86dB CMRR at 60Hz suppresses mains-borne interference without additional filtering stages. |
| Ground Loop Eliminator | Voltage-Controlled Current Source |
|
Use Scenario: Interfacing legacy 4–20mA sensors to modern isolated ADCs in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Isolates sensor ground from controller ground while amplifying differential voltage across sense resistor. Use Value: No external resistors required; laser-trimmed network ensures consistent gain and offset across production units. |
Use Scenario: Generating precise 0–100mA programmable load current for LED driver characterization benches. IC Role / Device Role / Timing Role: G = 2 configuration converts DAC output (0–5V) into 0–10V across 100Ω sense resistor, yielding 0–100mA. Use Value: 14V/µs slew rate ensures <1µs response to DAC step changes-critical for dynamic load testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar difference amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA149IDR | Higher CMRR (120dB), lower offset (±100µV), but narrower bandwidth (1.2MHz); SO-8, same supply range | Better for ultra-precision DC measurements; less suitable for >1MHz signal conditioning | Select INA149IDR when offset and CMRR dominate over speed; verify layout compatibility with higher PSRR sensitivity |
| AD8271ARMZ | G = 1 only, 10MHz bandwidth, ±150µV offset, ±10V/V gain error; MSOP-8, same temp range | Optimized for unity-gain, high-speed differential-to-single-ended conversion | Choose AD8271ARMZ for G = 1 applications requiring >3× bandwidth; not drop-in for G = 1/2 or G = 2 use cases |
Compared with INA157UA/2K5, INA149IDR trades bandwidth for superior DC precision, while AD8271ARMZ offers higher speed but lacks configurable gain-making INA157UA/2K5 uniquely balanced for industrial G = 1/2 or G = 2 signal conditioning where rail extension and settling time matter.
Availability
INA157UA/2K5 is available at Aetrix Electronics and suitable for current shunt monitoring, differential sensor interfacing, ground loop elimination, and voltage-controlled current sourcing requiring stable component supply across extended industrial temperature ranges.
Supply support for INA157UA/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 for industrial, medical, and test equipment markets.
The INA157 series was designed specifically for high-fidelity differential amplification in noisy environments-targeting applications demanding rail-extended inputs, laser-trimmed gain accuracy, and fast settling without external components.
FAQ
What is the maximum input common-mode voltage for INA157UA/2K5 at ±15V supplies?
The INA157UA/2K5 supports an input common-mode voltage range from 3•(V+) – 7.5V to 3•(V–) + 7.5V. At ±15V supplies, this equals +37.5V to –37.5V-enabling direct measurement of signals exceeding the supply rails, such as high-side current sensing in 48V systems. This specification is confirmed in the "INPUT VOLTAGE RANGE" table of the SBOS105 datasheet.
Can INA157UA/2K5 be used with single-supply operation?
No-INA157UA/2K5 is specified exclusively for dual-supply operation from ±4V to ±18V. Its internal architecture requires symmetric or asymmetric bipolar rails; it does not support true single-supply use (e.g., 0V to +15V). Attempting single-supply biasing violates absolute maximum ratings and invalidates all AC/DC performance specs. For single-supply difference amplifiers, consider TI's INA333 or ADI's AD8276.
What is the function of Pin 8 (Sense) on INA157UA/2K5?
Pin 8 (Sense) provides access to the internal feedback node of the laser-trimmed resistor network. It is used only in non-standard gain configurations-for example, when reversing input and feedback resistors to achieve G = 2 (per Figure 2 in SBOS105). In default G = 1/2 operation, Pin 8 remains unused and should be left unconnected per datasheet guidance.
Does INA157UA/2K5 require external decoupling capacitors?
Yes-decoupling capacitors (e.g., 1µF ceramic) are strongly recommended on both V+ (Pin 6) and V– (Pin 4), placed as close as possible to the pins. This is explicitly stated in the "APPLICATIONS INFORMATION" section of the datasheet to suppress noise coupling and ensure stability, especially with high-impedance or noisy power supplies. Omitting them risks degraded PSRR and oscillation.
Is INA157UA/2K5 pin-compatible with INA157U or INA157U/2K5?
Yes-INA157UA/2K5 shares identical SO-8 pinout, electrical specifications, and thermal characteristics with INA157U and INA157U/2K5. The "A" suffix denotes enhanced screening (e.g., tighter initial offset distribution), and "/2K5" indicates tape-and-reel packaging (2500 units/reel), but all variants use the same die and footprint. Layouts designed for INA157U are fully compatible with INA157UA/2K5.
INA157UA/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
INA157UA/2K5 FAQ
1.How can I place an order for INA157UA/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA157UA/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 INA157UA/2K5 reliable?
The price and inventory of INA157UA/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA157UA/2K5 is usually 5 days.
3.What payment methods are accepted for INA157UA/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA157UA/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA157UA/2K5?
INA157UA/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA157UA/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 INA157UA/2K5?
For technical support, including INA157UA/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA157UA/2K5 requirements.
6.How does Aetrix verify that INA157UA/2K5 is sourced from the original manufacturer or authorized distributors?
All INA157UA/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 INA157UA/2K5 meets industry standards.
7.What is the process for return or replacement of INA157UA/2K5?
All INA157UA/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with INA157UA/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 INA157UA/2K5 part is unused and in its original packaging.
Return procedure for INA157UA/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA157UA/2K5 Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
