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Texas Instruments INA155UA/2K5
- Part No.:
- INA155UA/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA155UA/2K5.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,138
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Product details
Overview
INA155UA/2K5 from Texas Instruments (formerly Burr-Brown) is a single-supply, rail-to-rail output CMOS instrumentation amplifier with fixed gain options of 10 V/V or 50 V/V, ±200 µV max input offset voltage, ±5 µV/°C drift, and 550 kHz bandwidth at G = 10. It operates from +2.7 V to +5.5 V and is specified over –55°C to +125°C, making it suitable for industrial bridge sensor conditioning in harsh environments.
For engineers reviewing the INA155UA/2K5 datasheet, INA155UA/2K5 pinout, INA155UA/2K5 application, or INA155UA/2K5 equivalent, key selection criteria include its rail-to-rail output swing within 10 mV of rails, ultra-low input bias current (0.2 pA typ), internal gain configuration via pins 1 and 8, SO-8 package compatibility, and guaranteed performance across extended temperature range.
Technical Context
The INA155UA/2K5 implements a three-op-amp architecture with complementary CMOS input stages enabling rail-to-rail common-mode input operation outside the (V+) – 1.8 V to (V+) – 0.8 V transition zone. Its gain is set by open-circuit (G = 10) or shorted (G = 50) connection between pins 1 and 8 - no external resistors required for standard configurations.
Internal laser trimming ensures ±200 µV max input offset voltage and ±5 µV/°C drift over temperature. The output stage delivers 6.5 V/µs slew rate and settles to 0.1% in 5 µs (G = 10, 2 V step), supporting direct interface with high-speed SAR ADCs such as ADS7818 without external buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Options | Fixed 10 V/V (pins 1 & 8 open) or 50 V/V (pins 1 & 8 shorted); enables rapid, resistor-free gain selection |
| Input Offset Voltage | ±200 µV max (–55°C to +125°C); ensures high DC accuracy in precision sensor front-ends |
| Input Bias Current | 0.2 pA typical; supports ultra-high-impedance sources like piezoelectric sensors and pH electrodes |
| Bandwidth | 550 kHz at G = 10; sufficient for 100+ Hz bridge sensor outputs and anti-aliasing before 500 kSPS ADCs |
| Rail-to-Rail Output | Swings within 5 mV of supply rails (RL = 10 kΩ); maximizes dynamic range in low-voltage single-supply systems |
| Supply Range | +2.7 V to +5.5 V; compatible with 3.3 V and 5 V logic domains and battery-powered instrumentation |
| Operating Temp | –55°C to +125°C; qualified for under-hood automotive, downhole oil/gas, and industrial control applications |
Pinout & Package
INA155UA/2K5 is packaged in an SO-8 surface-mount package (Package Drawing D, JEDEC MS-012), with θJA = 150°C/W and RoHS-compliant NiPdAu lead finish. Tape-and-reel delivery (2500 pcs/reel) complies with JEDEC J-STD-020 moisture sensitivity level 2 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RG) | Gain select terminal | Connect to pin 8 for G = 50; leave open for G = 10; impedance < 20 Ω required for < 0.2% gain error at G = 50 |
| 2 (VIN–) | Inverting input | Differential input node; requires bias current return path (e.g., matched resistors to Ref or V–) |
| 3 (VIN+) | Non-inverting input | Differential input node; same bias current return requirements as pin 2 |
| 4 (V–) | Negative supply | Ground reference for single-supply operation; must be low-impedance for optimal PSRR |
| 5 (Ref) | Output reference | Sets output common-mode level; must be driven low-impedance (≤200 Ω) to maintain >80 dB CMRR |
| 6 (VOUT) | Amplified output | Rail-to-rail output capable of driving 10 kΩ loads or capacitive ADC inputs up to 100 pF |
| 7 (V+) | Positive supply | Primary power rail; decoupling capacitor (0.1 µF) required close to pin for stability |
| 8 (RG) | Gain select terminal | Paired with pin 1; shorting defines G = 50; open circuit defines G = 10 |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Within 5 mV of V+ and V– rails at light load, preserving full-scale resolution in 12-bit+ data acquisition |
| Laser-trimmed offset & drift | ±200 µV max offset and ±5 µV/°C drift eliminate need for external nulling in most bridge and RTD applications |
| Ultra-low input bias current | 0.2 pA typical enables use with >1 GΩ source impedances without significant voltage error |
| Single-supply optimized architecture | Operates from +2.7 V to +5.5 V with input common-mode range extending to within 0.3 V of V– and 0.3 V of V+ |
| Fast settling & overload recovery | 5 µs to 0.1% (G = 10) and 0.2 µs overload recovery enable high-throughput scanning in multi-channel DAQ systems |
Applications
| Industrial Bridge Sensing | Medical Biopotential Amplification |
|---|---|
Use Scenario: Amplifying low-level differential signals from strain-gauge load cells and pressure transducers operating on 3.3 V or 5 V supplies. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing fixed 10× or 50× gain, rail-to-rail output, and DC-coupled signal conditioning. Use Value: Delivers ±200 µV offset and ±5 µV/°C drift to resolve sub-millivolt bridge outputs without calibration drift in factory automation systems. | Use Scenario: Front-end amplification of ECG and EEG signals in portable patient monitors with strict power and size constraints. IC Role / Device Role / Timing Role: Low-noise, low-bias-current instrumentation amplifier rejecting 50/60 Hz interference while preserving microvolt-level biopotentials. Use Value: 0.2 pA input bias current prevents electrode polarization errors; rail-to-rail output drives ADCs directly, reducing BOM count. |
| High-Speed ADC Driver | PCMCIA Data Acquisition Card |
Use Scenario: Driving sampling inputs of 12-bit SAR ADCs (e.g., ADS7818) at 500 kSPS in automated test equipment. IC Role / Device Role / Timing Role: Fast-settling, low-distortion driver with 6.5 V/µs slew rate and 0.1% settling in 5 µs. Use Value: Eliminates need for external op-amp buffer; 550 kHz bandwidth and THD+N < 0.01% at 1 kHz ensure fidelity in digitized waveforms. | Use Scenario: Signal conditioning in PCMCIA cards for field-deployable vibration analysis and environmental monitoring. IC Role / Device Role / Timing Role: Compact, SO-8-packaged instrumentation amplifier enabling dual-channel analog front-end in tight card-edge space. Use Value: SO-8 footprint and 2.7–5.5 V operation simplify power design; extended –55°C to +125°C rating supports outdoor deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA126UA/2K5 | Lower bandwidth (350 kHz), higher quiescent current (1.8 mA vs 2.1 mA), same SO-8 package and gain options | Better noise performance (12 nV/√Hz vs 40 nV/√Hz at 1 kHz) but slower response limits use in >200 kSPS systems | Select when ultra-low noise dominates over speed; avoid when driving fast SAR ADCs or requiring >500 kHz closed-loop bandwidth |
| AD623ARZ-REEL7 | Wider supply range (±2.5 V to ±15 V or +5 V to +30 V), higher offset (±500 µV), different pinout (no RG pins) | Supports dual-supply industrial systems and higher-voltage sensors; lacks pin-strappable gain, requiring external resistors | Select for legacy dual-rail designs or high-voltage bridge interfaces; avoid when board space is constrained or resistor-free gain setup is required |
Compared with INA126UA/2K5 and AD623ARZ-REEL7, the INA155UA/2K5 offers superior speed (550 kHz vs 350 kHz/1200 kHz), lower input bias current (0.2 pA vs 20 nA/3 nA), and simpler gain configuration - making it optimal for compact, battery-powered, high-channel-count data loggers where layout simplicity and low leakage are critical.
Availability
INA155UA/2K5 is available at Aetrix Electronics and suitable for industrial sensor amplifiers, medical biopotential monitoring, high-speed ADC driving, and PCMCIA data acquisition cards requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for INA155UA/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 full product support, datasheet documentation, and manufacturing continuity for the INA155 series.
The INA155 product line was designed specifically for cost-sensitive, single-supply instrumentation applications - emphasizing rail-to-rail output, ultra-low bias current, and simplified gain configuration in compact SO-8 and MSOP-8 packages.
FAQ
What gain options does the INA155UA/2K5 support, and how are they configured?
The INA155UA/2K5 supports two fixed gain options: 10 V/V and 50 V/V. Gain is selected by pin strapping - leaving pins 1 and 8 open configures G = 10, while shorting them together configures G = 50. No external resistors are needed for these standard gains. The INA155UA/2K5 datasheet specifies gain error < 0.1% for G = 10 and < 0.25% for G = 50 over temperature.
Does the INA155UA/2K5 require external components for basic operation?
Yes - the INA155UA/2K5 requires a low-impedance reference voltage applied to the Ref pin (pin 5), typically VS/2, and a 0.1 µF ceramic decoupling capacitor between V+ (pin 7) and V– (pin 4). Input bias current return paths (e.g., matched resistors) must also be provided for VIN+ and VIN–. The INA155UA/2K5 does not integrate these passive components.
What is the maximum operating temperature range for the INA155UA/2K5?
INA155UA/2K5 is fully specified and guaranteed over –55°C to +125°C, with absolute maximum ratings extending to –65°C to +150°C for storage and operation. This extended range qualifies the device for under-hood automotive, downhole sensing, and industrial control applications where ambient temperatures exceed commercial grade limits.
Can the INA155UA/2K5 drive capacitive loads directly, such as ADC inputs?
Yes - the INA155UA/2K5 is stable driving capacitive loads up to 100 pF with 10 kΩ series resistance, as verified in the datasheet's typical performance curves. It directly drives SAR ADCs like the ADS7818 (12-bit, 500 kSPS) without external buffering, leveraging its 6.5 V/µs slew rate and fast 5 µs 0.1% settling time at G = 10.
Is the INA155UA/2K5 RoHS compliant and lead-free?
Yes - the INA155UA/2K5 uses NiPdAu lead finish and is RoHS compliant per EU Directive 2011/65/EU, with green (low-halogen) packaging. It meets JEDEC J-STD-020 moisture sensitivity level 2 and is rated for peak reflow temperatures up to 260°C. The "/2K5" suffix denotes 2500-piece tape-and-reel packaging compliant with industry shipping standards.
INA155UA/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:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 6.5V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 550 kHz
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 1.7mA
- Current - Output / Channel:
- 50 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
INA155UA/2K5 FAQ
1.How can I place an order for INA155UA/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA155UA/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 INA155UA/2K5 reliable?
The price and inventory of INA155UA/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA155UA/2K5 is usually 5 days.
3.What payment methods are accepted for INA155UA/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA155UA/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA155UA/2K5?
INA155UA/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA155UA/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 INA155UA/2K5?
For technical support, including INA155UA/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA155UA/2K5 requirements.
6.How does Aetrix verify that INA155UA/2K5 is sourced from the original manufacturer or authorized distributors?
All INA155UA/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 INA155UA/2K5 meets industry standards.
7.What is the process for return or replacement of INA155UA/2K5?
All INA155UA/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with INA155UA/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 INA155UA/2K5 part is unused and in its original packaging.
Return procedure for INA155UA/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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