My Inquiry
My Account
Texas Instruments INA145UA
- Part No.:
- INA145UA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA145UA.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,237
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
INA145UA from Texas Instruments (originally Burr-Brown) is a precision programmable-gain difference amplifier with unity-gain core, laser-trimmed on-chip resistor network, 86 dB CMRR at 25°C, ±0.2 mV input offset voltage (typ), and SO-8 package rated for –40°C to +85°C. It enables high-accuracy current shunt measurement in industrial power supplies.
For engineers reviewing the INA145UA datasheet, INA145UA pinout, INA145UA application, or INA145UA equivalent, key selection factors include its rail-to-rail common-mode input range beyond supply rails, external gain-setting via RG1/RG2 (G = 1–1000), low 570 µA quiescent current, and guaranteed performance under single-supply (4.5 V to 36 V) or dual-supply (±2.25 V to ±18 V) operation.
Technical Context
The INA145UA integrates two precision op amps (A1 and A2) with a monolithic 10 kΩ laser-trimmed feedback resistor between them. Its differential input stage (A1) provides wide common-mode range (e.g., –2.5 V to +5.5 V on +5 V supply), while the output buffer (A2) supports programmable gain via external RG1/RG2 resistors using G = 1 + RG2/RG1.
Internal resistor matching ensures 0.01% initial gain error and 86 dB CMRR; TCR tracking maintains stability over temperature. The device operates with no external compensation up to 1000 pF capacitive load and delivers 0.45 V/µs slew rate with 40 µs 0.1% settling time for 10 V step at G = 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Range | 1 V/V to 1000 V/V - set externally with two resistors; enables flexible signal scaling without redesigning front-end. |
| Input Offset Voltage | ±0.2 mV (max, RTI) - ensures sub-millivolt accuracy in low-level differential sensing like shunt-based current monitoring. |
| CMRR | 86 dB (min, 25°C) - rejects noise and interference in noisy industrial environments where common-mode voltages exceed rails. |
| Supply Range | Single: +4.5 V to +36 V; Dual: ±2.25 V to ±18 V - supports wide-range industrial and battery-powered systems. |
| Quiescent Current | 570 µA (typ) - enables low-power operation in portable or always-on monitoring circuits. |
| Small-Signal Bandwidth | 500 kHz at G = 1 - sufficient for DC to medium-frequency motor control feedback and sensor conditioning. |
| Output Voltage Swing | (V–) + 0.15 V to (V+) – 1 V (RL = 100 kΩ) - provides usable dynamic range near supply rails for single-supply ADC interfacing. |
Pinout & Package
INA145UA is housed in an SO-8 (SOIC-D) surface-mount package with standard 1.27 mm pitch, JEDEC MS-012 compliant, MSL Level-3, and RoHS-compliant NiPdAu lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Ref) | Reference Input | DC bias point for output level shift; source impedance < 10 Ω required to preserve CMRR. |
| 2 (VIN–) | Inverting Input | Differential input node; matched impedance critical to maintain 86 dB CMRR. |
| 3 (VIN+) | Non-inverting Input | Differential input node; internal 1:1 divider with Ref sets A1's non-inverting input voltage. |
| 4 (V–) | Negative Supply | Ground or negative rail connection; bypass capacitor required nearby for stability. |
| 5 (VO1) | A1 Output / A2 Input Node | Accessible internal node for filtering or precision current sourcing; buffered by 10 kΩ trimmed resistor. |
| 6 (VO) | Main Output | Programmable-gain buffered output; drives 10 kΩ loads with rail-swing capability. |
| 7 (V+) | Positive Supply | Positive rail connection; bypass capacitor required nearby to suppress PSRR degradation. |
| 8 (RG) | Gain-Setting Terminal | Connects external RG2 resistor; RG1 connects between pins 1 and 8 to define G = 1 + RG2/RG1. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed resistor network | Enables 0.01% initial gain error and <10 ppm/°C drift - eliminates manual calibration in production test. |
| Rail-exceeding common-mode range | Supports inputs up to ±28 V at ±15 V supply - allows direct connection to high-side shunts without level-shifting. |
| Stable with 1000 pF capacitive load | Eliminates need for external isolation resistor when driving long traces or ADC input capacitance. |
| Low 570 µA quiescent current | Reduces thermal drift and power dissipation in thermally constrained enclosures or battery-operated designs. |
| Internal 10 kΩ trimmed resistor at VO1 | Provides precise gain-setting node with ±0.2% absolute tolerance - enables accurate external filter or current-source design. |
Applications
| Current Shunt Measurement | Sensor Amplifier |
|---|---|
Use Scenario: Monitoring bidirectional motor phase current via 10 mΩ shunt resistor in 24 V industrial drive. IC Role / Device Role / Timing Role: Difference amplifier rejecting common-mode bus noise while amplifying µV-level differential voltage across shunt. Use Value: Delivers 0.01% gain accuracy and 86 dB CMRR to resolve ±100 mA current changes with <1% error despite ±20 V common-mode transients. | Use Scenario: Conditioning output of a bridge-based pressure sensor in HVAC control panel. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end with user-defined gain (G = 100) for mV-level sensor output. Use Value: Laser-trimmed resistors ensure stable gain over –40°C to +85°C ambient, eliminating recalibration during seasonal temperature swings. |
| Differential Line Receiver | Battery Powered Systems |
Use Scenario: Receiving RS-422-like differential signals in factory-floor PLC I/O module with ground potential differences up to ±5 V. IC Role / Device Role / Timing Role: High-CMRR receiver converting differential analog data to single-ended output for microcontroller ADC. Use Value: Common-mode input range extends beyond rails (e.g., –2.5 V to +5.5 V on +5 V supply), tolerating large ground offsets without clipping. | Use Scenario: Low-power battery monitor measuring cell voltage differentials in 4-cell Li-ion pack with 16-bit SAR ADC. IC Role / Device Role / Timing Role: Ultra-low-quiescent-current difference amplifier providing rail-compatible output for ADC reference. Use Value: 570 µA IQ enables >1-year runtime on coin cell; output swing to (V–)+0.15 V supports accurate low-voltage measurement near battery depletion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar difference amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA146UA | Higher CMRR (90 dB min), lower offset drift (±0.1 µV/°C), same SO-8 package and pinout. | Better suited for precision metrology where temperature-induced gain/offset drift must be minimized. | Select INA146UA when long-term stability over wide temperature excursions is prioritized over cost. |
| AD629ARZ | Fixed gain (10 V/V), higher bandwidth (500 kHz), integrated laser-trimmed thin-film resistors, SO-8 package. | Optimized for high-speed high-common-mode applications (e.g., motor phase voltage sensing) without external gain components. | Choose AD629ARZ when fixed gain simplifies BOM and layout, and 200 V common-mode range is required. |
Compared with INA145UA, INA146UA offers superior drift performance but identical gain flexibility, while AD629ARZ trades programmability for higher speed and extended common-mode range-making each suitable for distinct system-level trade-offs in accuracy, speed, and design complexity.
Availability
INA145UA is available at Aetrix Electronics and suitable for current shunt measurement, sensor amplifier, differential line receiver, and battery powered systems requiring stable component supply across industrial temperature ranges and long product lifecycles.
Supply support for INA145UA 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 legacy precision analog product lines including the INA series. TI is a global semiconductor leader focused on analog and embedded processing.
The INA145UA belongs to TI's precision difference amplifier product line, designed specifically for high-accuracy industrial current sensing, sensor signal conditioning, and differential data acquisition where rail-exceeding common-mode rejection and stable gain are critical.
FAQ
What is the maximum common-mode voltage the INA145UA can handle with a ±15V supply?
The INA145UA supports ±28 V common-mode voltage when operated with ±15 V supplies. This specification is explicitly guaranteed in the datasheet under "HIGH COMMON-MODE VOLTAGE" and confirmed in Absolute Maximum Ratings, enabling direct high-side shunt measurement without attenuation networks. The INA145UA maintains full functionality and specified CMRR within this range.
Can the INA145UA be used with a single 5V supply, and what is its common-mode input range in that configuration?
Yes, the INA145UA operates from a single +5 V supply. Its common-mode input range is –2.5 V to +5.5 V when VREF = 2.5 V, as verified in the "SPECIFICATIONS: VS = +5V Single Supply" table. This rail-exceeding range allows measurement of signals below ground or above V+, such as automotive battery monitoring or industrial sensor interfaces with floating grounds.
How is gain set on the INA145UA, and what is the minimum external component count for G = 1?
Gain is set by two external resistors: G = 1 + RG2/RG1. For G = 1, RG1 is omitted and RG2 = 10 kΩ is connected from pin 8 (RG) to pin 7 (V+), per Figure 1 and "SETTING THE GAIN" section. This configuration uses only one external resistor and leverages the internal 10 kΩ trimmed resistor to achieve precise unity gain with bias current cancellation - minimizing BOM and layout area for basic difference amplification.
Does the INA145UA require external compensation capacitors for stability?
No, the INA145UA is internally compensated and remains stable with capacitive loads up to 1000 pF, as stated in the "Capacitive Load" specification and confirmed in typical performance curves. This eliminates the need for external compensation components in most applications, including direct driving of SAR ADC inputs or long PCB traces, reducing design complexity and board space.
What is the purpose of the VO1 pin (pin 5) on the INA145UA, and how is it typically used?
Pin 5 (VO1) is the output of internal op amp A1 and input to A2, accessible via a 10 kΩ laser-trimmed resistor. As described in "APPLICATION INFORMATION", it enables insertion of filters (e.g., low-pass RC), precision current sources, or offset trimming circuits without affecting the main signal path. Its ±1% absolute tolerance makes it suitable for high-accuracy auxiliary functions while preserving the integrity of the primary amplified output at pin 6 (VO).
INA145UA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- Differential
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 0.45V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 500 kHz
- Current - Input Bias:
- 50 nA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 570µA
- Current - Output / Channel:
- 15 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
INA145UA FAQ
1.How can I place an order for INA145UA through Aetrix?
Please submit a Request for Quotation (RFQ) for INA145UA 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 INA145UA reliable?
The price and inventory of INA145UA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA145UA is usually 5 days.
3.What payment methods are accepted for INA145UA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA145UA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA145UA?
INA145UA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA145UA 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 INA145UA?
For technical support, including INA145UA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA145UA requirements.
6.How does Aetrix verify that INA145UA is sourced from the original manufacturer or authorized distributors?
All INA145UA 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 INA145UA meets industry standards.
7.What is the process for return or replacement of INA145UA?
All INA145UA units undergo pre-shipment inspection (PSI). If there is an issue with INA145UA, 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 INA145UA part is unused and in its original packaging.
Return procedure for INA145UA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA145UA 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…
