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Texas Instruments INA103KU/1KG4
- Part No.:
- INA103KU/1KG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
INA103KU/1KG4.pdf
- Description:
- IC INST AMP 1 CIRCUIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,712
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Product details
Overview
INA103KU/1KG4 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, 100 MHz gain-bandwidth product at G = 1000, and >100 dB CMRR - enabling high-accuracy amplification of strain gage, thermocouple, and microphone signals in professional audio and industrial measurement systems.
For engineers reviewing the INA103KU/1KG4 datasheet, INA103KU/1KG4 pinout, INA103KU/1KG4 application, or INA103KU/1KG4 equivalent, key selection criteria include its fixed-gain options (G = 1 or 100), ±9 V to ±25 V dual-supply operation, SOIC-16 package thermal performance, and built-in distortion cancellation circuitry for transformerless microphone preamp designs.
Technical Context
The INA103KU/1KG4 employs a three-op-amp current-feedback architecture with laser-trimmed internal 3 kΩ feedback resistors, enabling precise gain setting via external RG (G = 1 + 6 kΩ/RG) or factory-configured G = 100. Its balanced differential inputs and copper lead frame in the SOIC package support stable operation up to ±25 V supplies and 85°C ambient temperature.
Unlike voltage-feedback IAs, the current-feedback topology provides wide bandwidth independent of gain (e.g., 800 kHz at G = 100), fast settling (1.5 µs to 0.1%), and low output impedance - critical for driving capacitive loads and maintaining CMRR under dynamic common-mode transients in bridge-based sensing applications.
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, ideal for low-level microphone and transducer signals. |
| THD+N | 0.0009% at 1 kHz, G = 100 - supports high-fidelity audio amplification without harmonic contamination in professional preamp stages. |
| Gain-Bandwidth Product | 100 MHz at G = 1000 - ensures wide small-signal bandwidth even at high gains, preserving transient fidelity in fast-changing sensor outputs. |
| CMRR | >100 dB at DC–60 Hz, G = 100 - rejects power-line interference and common-mode noise in unshielded industrial environments. |
| Supply Range | ±9 V to ±25 V - accommodates legacy ±15 V audio rails and high-voltage industrial sensor interfaces without level-shifting. |
| Output Drive | ±40 mA continuous, ±70 mA short-circuit - directly drives 600 Ω audio loads or low-impedance cables without external buffers. |
| Settling Time | 1.5 µs to 0.1% at G = 100, 20 V step - meets timing requirements for high-speed data acquisition and real-time control loops. |
Pinout & Package
Surface-mount SOIC-16 package (DW) with 1.27 mm pitch, 7.5 mm × 10.3 mm body, and 2.65 mm max height. Copper lead frame ensures low thermal resistance (θJA = 100°C/W) for stable operation under sustained output current.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 16 | +Input / –Input | Differential input terminals - high-impedance (60 MΩ || 2 pF diff) nodes requiring symmetrical layout to preserve CMRR. |
| 2, 15 | +Gain Sense / –Gain Sense | Internal 3 kΩ resistor taps - connect externally for custom gain (RG) or short for G = 100; sensitive to noise coupling. |
| 3, 4 | +Offset Null / –Offset Null | Laser-trimmed offset adjustment points - used with 10 kΩ potentiometer to null output stage offset without degrading drift. |
| 5, 6 | +Gain Drive / –Gain Drive | Current-feedback amplifier outputs - drive internal gain-setting resistors; must be routed away from input traces to prevent oscillation. |
| 7 | Ref Sense | Output reference node - low-impedance connection point for remote sense feedback to compensate I·R drop in long load lines. |
| 8 | V– | Negative supply rail - requires local 1 µF tantalum bypass capacitor to suppress high-frequency supply noise. |
| 9 | V+ | Positive supply rail - same bypassing requirement as V–; asymmetric decoupling degrades PSRR above 10 kHz. |
| 10, 11 | –R / +R | Internal 60.6 Ω (G = 100) or open (G = 1) gain-setting resistors - define fixed-gain configuration; no external components needed for standard modes. |
| 12 | Output | Main amplified output - capable of ±21 V swing into 600 Ω at ±25 V supplies; stable with ≤10 nF capacitive loads. |
| 13, 14 | +Input / –Input | Redundant input labels per datasheet diagram - pins 1 and 16 are primary; pins 13–14 are not connected in SOIC-16 pinout. |
Key Features
| Feature | Design Value |
|---|---|
| Distortion cancellation circuitry | Reduces THD+N to 0.0009% at G = 100 by actively canceling even-order harmonics in the current-feedback path. |
| Laser-trimmed internal resistors | 3 kΩ feedback resistors trimmed to ±0.1% tolerance and 50 ppm/°C TCR - enables accurate, stable gain without external precision components. |
| Built-in G = 1 and G = 100 configurations | No external RG required for standard gains - simplifies PCB layout and eliminates resistor placement errors in audio and sensor front-ends. |
| Copper lead frame construction | Improves thermal dissipation in SOIC package - maintains <100°C junction temperature at 12.5 mA quiescent current and ±40 mA output load. |
| Overload fold-back protection | Prevents output phase reversal during input overdrive - ensures clean recovery (<1 µs) and avoids latch-up in bridge transducer fault conditions. |
Applications
| High-Quality Microphone Preamplifier | Moving-Coil Phono Preamplifier |
|---|---|
Use Scenario: Amplifying low-level balanced microphone signals (–60 dBu to –40 dBu) in recording consoles and broadcast mixers without transformer coupling. IC Role / Device Role / Timing Role: Primary gain stage with fixed G = 100, providing 40 dB of clean voltage amplification while rejecting cable-borne RFI and ground-loop noise. Use Value: Eliminates bulky, expensive audio transformers and their associated saturation, frequency roll-off, and phase distortion - enabling compact, high-channel-count analog front-ends. | Use Scenario: Boosting RIAA-equalized output from moving-coil cartridges (typically 0.3 mV–5 mV) to line level (≈1 Vrms) in high-end turntable preamps. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier with G = 100 and optional external RC network for RIAA compensation, operating from ±15 V rails. Use Value: Delivers ultra-low noise (1 nV/√Hz) and vanishingly low THD+N (0.0009%) across the full 20 Hz–20 kHz audio band - preserving harmonic integrity of vinyl playback. |
| Strain Gage Weigh Scale Front-End | Thermocouple Signal Conditioning |
Use Scenario: Amplifying mV-level differential outputs from full-bridge load cells (2–3 mV/V) in industrial weighing systems with 12-bit to 16-bit ADCs. IC Role / Device Role / Timing Role: Precision instrumentation amplifier with G = 100, driven from ±12 V supplies, feeding a 24-bit sigma-delta ADC with programmable gain. Use Value: >100 dB CMRR rejects common-mode noise from motor drives and switching power supplies; 0.0006% nonlinearity ensures <0.01% full-scale error over temperature. | Use Scenario: Cold-junction-compensated amplification of K-type thermocouple outputs (≈41 µV/°C) in furnace controllers and environmental monitoring systems. IC Role / Device Role / Timing Role: Low-drift (1 µV/°C), low-noise front-end with G = 100, referenced to an on-board RTD or IC temperature sensor for CJC. Use Value: Input offset voltage drift of only 1 µV/°C (G = 100) minimizes temperature-induced measurement error - critical for ±0.5°C accuracy over –40°C to +85°C. |
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; 1000 V/V max gain; lower input bias current (50 pA) | Better for high-impedance DC sensors (e.g., pH electrodes); unsuitable for low-noise audio due to higher voltage noise | Select when source impedance >10 kΩ or DC precision dominates over audio bandwidth |
| AD620ARZ | Voltage-feedback topology; 9 nV/√Hz noise; 1000 V/V max gain; 120 dB min CMRR at G = 100 | Higher CMRR stability over frequency; wider supply range (±2.3 V to ±18 V); lacks current-feedback speed | Select when ultra-stable CMRR at 1 kHz+ or single-supply operation is required over transient response |
Compared with INA114BP and AD620ARZ, the INA103KU/1KG4 uniquely combines sub-1 nV/√Hz noise, current-feedback bandwidth, and built-in G = 100 configuration - making it irreplaceable in transformerless microphone preamps and high-speed bridge signal chains where both noise and slew rate are limiting factors.
Availability
INA103KU/1KG4 is available at Aetrix Electronics and suitable for professional audio equipment, industrial weigh scales, thermocouple measurement systems, and high-fidelity phono preamplifiers requiring stable component supply and long-term lifecycle support.
Supply support for INA103KU/1KG4 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, including legacy high-performance instrumentation amplifiers. TI is a global leader in analog and embedded processing technologies.
The INA103 belongs to Burr-Brown's legacy high-fidelity instrumentation amplifier family, designed specifically for low-noise, low-distortion signal conditioning in professional audio, studio equipment, and precision industrial measurement - where transformerless microphone preamplification and wideband bridge sensing are critical.
FAQ
What is the maximum supply voltage for the INA103KU/1KG4?
The INA103KU/1KG4 supports a dual-supply range of ±9 V to ±25 V. Absolute maximum ratings specify ±25 V continuous on V+ and V– pins. Operation beyond ±25 V risks permanent damage. The device delivers ±21 V output swing into 600 Ω at ±25 V supplies, confirming robust high-voltage capability within this range. Always use local 1 µF tantalum bypass capacitors at each supply pin.
Does the INA103KU/1KG4 require external resistors to achieve G = 100?
No, the INA103KU/1KG4 does not require external resistors for G = 100. Its internal 60.6 Ω resistor between pins 10 and 11 sets G = 100 by default. Pin 14 connects to pin 6 internally in the SOIC-16 package to complete the gain path. External RG is only needed for nonstandard gains using the equation G = 1 + 6 kΩ/RG - for example, 196 Ω yields G = 31.6.
How does the INA103KU/1KG4 compare to the AD625 in terms of overload recovery?
The INA103KU/1KG4 features active overload fold-back protection that prevents output phase reversal during input overdrive, recovering in <1 µs after 50% overdrive. In contrast, the AD625 exhibits "fold-back" behavior where output polarity inverts under overload, causing instability in closed-loop systems. This makes the INA103KU/1KG4 more reliable in bridge transducer applications prone to mechanical shock or electrical transients.
Can the INA103KU/1KG4 drive a 600 Ω load at full output swing?
Yes, the INA103KU/1KG4 can drive a 600 Ω load with ±12 V output swing at ±15 V supplies, and ±21 V at ±25 V supplies. Its ±40 mA continuous output current and ±70 mA short-circuit rating ensure stable operation into 600 Ω without external buffering. For best THD+N performance (<0.0009%), keep load capacitance ≤10 nF and use low-inductance PCB traces.
What is the purpose of the Ref Sense (pin 7) and Output (pin 12) pins on the INA103KU/1KG4?
The Ref Sense (pin 7) and Output (pin 12) pins enable remote sensing for improved gain accuracy. Connecting Ref Sense directly to the load's return path closes the feedback loop around I·R losses in output traces, compensating for voltage drop. This maintains precise gain even with long or high-resistance interconnects - essential in distributed sensor systems and high-current audio distribution.
INA103KU/1KG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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/1KG4 FAQ
1.How can I place an order for INA103KU/1KG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA103KU/1KG4 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/1KG4 reliable?
The price and inventory of INA103KU/1KG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA103KU/1KG4 is usually 5 days.
3.What payment methods are accepted for INA103KU/1KG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA103KU/1KG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA103KU/1KG4?
INA103KU/1KG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA103KU/1KG4 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/1KG4?
For technical support, including INA103KU/1KG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA103KU/1KG4 requirements.
6.How does Aetrix verify that INA103KU/1KG4 is sourced from the original manufacturer or authorized distributors?
All INA103KU/1KG4 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/1KG4 meets industry standards.
7.What is the process for return or replacement of INA103KU/1KG4?
All INA103KU/1KG4 units undergo pre-shipment inspection (PSI). If there is an issue with INA103KU/1KG4, 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/1KG4 part is unused and in its original packaging.
Return procedure for INA103KU/1KG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA103KU/1KG4 Tags
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