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Texas Instruments INA103KU/1K
- Part No.:
- INA103KU/1K
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
INA103KU/1K.pdf
- Description:
- IC INST AMP 1 CIRCUIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,877
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Product details
Overview
INA103KU/1K from Texas Instruments (formerly Burr-Brown) is a low-noise, low-distortion current-feedback instrumentation amplifier optimized for high-fidelity audio and precision sensor signal conditioning. It delivers 1 nV/√Hz input voltage noise at 1 kHz, 0.0009% THD+N at G = 100, and 100 MHz gain-bandwidth product at G = 1000, enabling high-resolution microphone preamplification and bridge transducer interfacing in professional audio and industrial weighing systems.
For engineers reviewing the INA103KU/1K datasheet, INA103KU/1K pinout, INA103KU/1K application, or INA103KU/1K equivalent, key selection criteria include its built-in G = 1 and G = 100 configurations, ±9 V to ±25 V dual-supply operation, 100 dB minimum CMRR at 60 Hz, and SOIC-16 surface-mount package with MSL Level-3 reflow compatibility.
Technical Context
The INA103KU/1K employs a three-op-amp current-feedback architecture with laser-trimmed internal 3 kΩ feedback resistors, enabling stable high-gain operation without external gain-setting networks for G = 1 or G = 100. Its differential input stage features matched 60 MΩ || 2 pF impedance and supports common-mode voltages up to ±12 V at ±15 V supplies.
Output stage drive capability reaches ±40 mA with ±21 V swing into 600 Ω at ±25 V supplies, and the integrated output sense (pin 11) and reference (pin 7) terminals support remote sensing for improved load regulation. The device avoids fold-back behavior during overload, limiting cleanly instead of inverting output polarity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise | 1 nV/√Hz at 1 kHz - enables near-theoretical noise floor with 200 Ω source impedances |
| THD+N | 0.0009% at G = 100, f = 1 kHz - supports ultra-low-distortion audio amplification |
| Gain-Bandwidth Product | 100 MHz at G = 1000 - sustains wide bandwidth even at high closed-loop gains |
| CMRR | >100 dB at G = 100, DC–60 Hz - rejects power-line interference in bridge sensor applications |
| Supply Range | ±9 V to ±25 V - accommodates high-headroom audio stages and industrial supply rails |
| Output Drive | ±40 mA continuous - drives low-impedance loads including 600 Ω audio lines |
| Settling Time | 1.5 µs to 0.1% for 20 V step at G = 100 - meets fast transient response requirements in data acquisition |
Pinout & Package
Surface-mount SOIC-16 package (DW) with 1.27 mm pitch, 7.5 mm × 10.3 mm body, and maximum height of 2.65 mm; RoHS-compliant, NIPDAUAG lead finish, MSL Level-3 (260 °C, 168 hr).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 16 | +Input / –Input | Differential input terminals; high-impedance, balanced inputs for sensor or microphone signals |
| 2, 15 | +Gain Sense / –Gain Sense | Internal gain-setting nodes; shorted externally for G = 100 configuration |
| 3, 4 | +Offset Null / –Offset Null | Laser-trimmed offset adjustment points; optional external potentiometer for fine-tuning |
| 5, 6 | +Gain Drive / –Gain Drive | Internal feedback node connections; used with external RG resistor for custom gain |
| 7 | Ref | Output reference terminal; low-impedance connection point for remote sensing or offset injection |
| 8, 9 | V– / V+ | Negative and positive supply pins; require local 1 µF tantalum bypassing per datasheet |
| 10, 11 | Sense / Output | Output sense and main output; Sense (pin 11) enables I·R loss compensation in long traces |
| 12–14 | G, +R, –R | Gain configuration terminals; pin 14 tied to pin 6 sets G = 100; pin 14 open sets G = 1 |
Key Features
| Feature | Design Value |
|---|---|
| Current-feedback architecture | Enables 100 MHz GBW at G = 1000 while maintaining stability with capacitive loads up to 10 nF |
| Built-in gain options | Factory-laser-trimmed 3 kΩ resistors support precise G = 1 or G = 100 without external components |
| Overload protection | Prevents output fold-back during overdrive; recovers in 1 µs after 50% overdrive removal |
| Output sense & reference | Allows Kelvin sensing at load to maintain gain accuracy despite PCB trace resistance |
| Thermal performance | Copper lead frame in SOIC-16 achieves θJA = 100 °C/W, supporting continuous ±40 mA output drive |
Applications
| High-Quality Microphone Preamplifier | Moving-Coil Preamplifier |
|---|---|
Use Scenario: Professional audio console input stage accepting balanced low-impedance microphones with phantom power. IC Role / Device Role / Timing Role: Primary gain stage converting mic-level differential signals to line-level outputs with minimal added noise or distortion. Use Value: 1 nV/√Hz noise and 0.0009% THD+N enable transformerless design, eliminating size, cost, and frequency-response limitations of discrete transformers. | Use Scenario: Phono preamplifier for magnetic cartridge playback requiring RIAA equalization and high gain. IC Role / Device Role / Timing Role: Low-noise first-stage amplifier before passive or active RIAA network; handles low-output moving-coil cartridges (0.3 mV typical). Use Value: 60 MΩ || 2 pF input impedance matches cartridge requirements while 100 dB CMRR suppresses turntable motor noise and ground loops. |
| Differential Receiver for Bridge Sensors | Strain-Gage Weigh Scale Signal Chain |
Use Scenario: Industrial process control system receiving differential outputs from pressure or flow transducers with Wheatstone bridge topology. IC Role / Device Role / Timing Role: Precision instrumentation amplifier rejecting common-mode noise on long sensor cables while amplifying mV-level bridge imbalances. Use Value: >100 dB CMRR at 60 Hz and ±12 V common-mode range ensure accurate readings in electrically noisy factory environments with AC mains coupling. | Use Scenario: Platform scale or hopper weighing system using four-wire strain-gage load cells connected in full-bridge configuration. IC Role / Device Role / Timing Role: Front-end signal conditioner providing fixed G = 100 gain, low-drift offset nulling, and robust ESD protection per IEC 61000-4-2. Use Value: Laser-trimmed gain error ≤0.25% and 25 ppm/°C gain tempco ensure stable calibration across 0°C to +70°C operating range without recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA114BP | FET-input architecture; 25 nV/√Hz noise; 10 MHz GBW at G = 100; lower input bias current (1 pA) | Better for high-impedance DC-coupled sensors (e.g., pH electrodes); unsuitable for low-noise audio due to higher voltage noise | Select INA114BP when source impedance exceeds 10 kΩ or ultra-low input bias current is required; avoid for microphone preamps. |
| AD625BN | Older bipolar design; 10 nV/√Hz noise; 1.2 MHz GBW at G = 100; requires external gain resistors for all gains | Compatible pinout but inferior noise/distortion; lacks built-in G = 100 and overload protection | AD625BN serves as legacy drop-in replacement only where board layout cannot change; INA103KU/1K offers measurable performance upgrades. |
Compared with INA114BP and AD625BN, the INA103KU/1K uniquely balances ultra-low voltage noise (1 nV/√Hz), high-speed response (100 MHz GBW), and factory-configured gain-making it optimal for audio-grade and medium-bandwidth precision measurement where both noise and speed matter.
Availability
INA103KU/1K is available at Aetrix Electronics and suitable for professional audio equipment, industrial weigh scales, bridge-based transducer interfaces, and high-fidelity test instrumentation requiring stable component supply and long-term lifecycle continuity.
Supply support for INA103KU/1K 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-performance signal chain ICs for industrial, audio, and test equipment markets.
The INA103KU/1K belongs to TI's legacy instrumentation amplifier family designed specifically for low-noise, high-CMRR signal extraction from weak differential sources such as microphones, thermocouples, and strain gages in demanding analog front-ends.
FAQ
What is the default gain configuration of the INA103KU/1K, and how is it set?
The INA103KU/1K supports two factory-set gains: G = 1 and G = 100. G = 100 is configured by connecting pin 14 (–Gain Sense) to pin 6 (+Gain Drive); G = 1 is set by leaving pin 14 unconnected. Both configurations use internal laser-trimmed 3 kΩ resistors, eliminating external components and ensuring ≤0.25% gain error at G = 100. The INA103KU/1K datasheet confirms this in Figure 5 and the Gain Selection section.
Does the INA103KU/1K require external capacitors for stability, and what values are recommended?
Yes - the INA103KU/1K requires 1 µF tantalum capacitors placed directly at pins 8 (V–) and 9 (V+) for supply decoupling, as specified in the Applications Information section. Output stability with capacitive loads up to 10 nF is guaranteed per Absolute Maximum Ratings; larger loads may require series isolation resistors. These requirements are validated in the Typical Performance Curves and Layout Guidelines of the INA103KU/1K datasheet.
Can the INA103KU/1K be used with single-supply operation?
No - the INA103KU/1K is specified exclusively for dual-supply operation from ±9 V to ±25 V. Its input common-mode range extends to ±12 V at ±15 V supplies, and output swing reaches ±21 V at ±25 V. Single-supply use violates absolute maximum ratings and causes undefined behavior. For single-supply instrumentation amplifiers, consider TI's INA333 or ADI's AD8421 - not the INA103KU/1K.
What is the purpose of pins 7 (Ref) and 11 (Sense) on the INA103KU/1K?
Pins 7 (Ref) and 11 (Sense) form a Kelvin-sensing pair that enables remote output voltage regulation. Connecting Ref to the load return and Sense to the load's high-side terminal closes the feedback loop around PCB trace resistance, preserving gain accuracy. This configuration is critical in high-current or long-trace applications where I·R drops would otherwise degrade precision. The INA103KU/1K datasheet details this in Figure 4 and the Output Sense section.
How does the INA103KU/1K handle input overdrive conditions compared to older instrumentation amplifiers like the AD625?
Unlike the AD625, which exhibits output fold-back (inversion) when overdriven, the INA103KU/1K limits cleanly without polarity reversal. Its overload recovery time is 1 µs after 50% overdrive removal, and it maintains linear behavior up to ±15 V input at G = 1. This behavior is confirmed in Figure 9 of the INA103KU/1K datasheet and eliminates post-processing artifacts in transient-heavy applications like impact testing or audio clipping detection.
INA103KU/1K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 15V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 6 MHz
- Current - Input Bias:
- 2.5 µA
- Voltage - Input Offset:
- 30 µV
- Current - Supply:
- 9mA
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 18 V
- Voltage - Supply Span (Max):
- 50 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
INA103KU/1K FAQ
1.How can I place an order for INA103KU/1K through Aetrix?
Please submit a Request for Quotation (RFQ) for INA103KU/1K 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 INA103KU/1K reliable?
The price and inventory of INA103KU/1K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA103KU/1K is usually 5 days.
3.What payment methods are accepted for INA103KU/1K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA103KU/1K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA103KU/1K?
INA103KU/1K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA103KU/1K 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 INA103KU/1K?
For technical support, including INA103KU/1K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA103KU/1K requirements.
6.How does Aetrix verify that INA103KU/1K is sourced from the original manufacturer or authorized distributors?
All INA103KU/1K 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 INA103KU/1K meets industry standards.
7.What is the process for return or replacement of INA103KU/1K?
All INA103KU/1K units undergo pre-shipment inspection (PSI). If there is an issue with INA103KU/1K, 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 INA103KU/1K part is unused and in its original packaging.
Return procedure for INA103KU/1K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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