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Texas Instruments INA103KP
- Part No.:
- INA103KP
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
INA103KP.pdf
- Description:
- IC INST AMP 1 CIRCUIT 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:166
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Product details
Overview
INA103KP 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 800 kHz –3 dB bandwidth at G = 100, enabling high-resolution amplification of microphone, thermocouple, and strain gage outputs in professional audio and industrial weighing systems.
For engineers reviewing the INA103KP datasheet, INA103KP pinout, INA103KP application, or INA103KP equivalent, key selection criteria include its fixed-gain options (G = 1 or 100), ±9 V to ±25 V dual-supply operation, 100 dB minimum CMRR at 60 Hz, built-in gain-setting resistors, and thermal performance enabled by copper lead frame in PDIP package.
Technical Context
The INA103KP employs a three-op-amp current-feedback architecture with laser-trimmed 3 kΩ internal feedback resistors, enabling wide bandwidth (up to 100 MHz at G = 1000) and fast settling (1.5 µs to 0.1% at G = 100). Its distortion cancellation circuitry suppresses harmonic and intermodulation distortion even at high gains.
Input stage bias current is ~2.5 µA (typ), resulting in low current noise (2 pA/√Hz at 1 kHz) but requiring source impedances ≤10 kΩ for optimal noise performance. The device features separate output sense (pin 11) and reference (pin 7) terminals for improved load regulation and common-mode rejection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Options | G = 1 (pin 14 open) or G = 100 (pin 14 → pin 6); external RG enables precise gain setting per G = 1 + 6 kΩ/RG |
| Input Voltage Noise | 1 nV/√Hz at 1 kHz - enables near-theoretical noise floor with 200 Ω source impedance |
| THD + Noise | 0.0009% at 1 kHz, G = 100 - supports ultra-low-distortion audio preamplification |
| CMRR | >100 dB at DC–60 Hz, G = 100 - rejects power-line interference in bridge transducer applications |
| Supply Range | ±9 V to ±25 V - accommodates high-output swing (±21 V into 600 Ω at ±25 V) without rail-to-rail limitation |
| Bandwidth | 800 kHz at G = 100 - preserves transient fidelity in moving-coil and differential receiver circuits |
| Input Offset Voltage | (250 + 5000/G) µV (KU grade) - 30 µV typ at G = 100, trimmed via pins 3/4 offset null network |
Pinout & Package
INA103KP is housed in a 16-pin plastic DIP (PDIP-N) package with copper lead frame for enhanced thermal dissipation. Pin 1 is marked with a notch or dot; top-view orientation follows standard DIP layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 16 | V+ / V− | Dual supply connections; bypass with 1 µF tantalum capacitors near pins for stability |
| 2, 15 | +Gain Sense / −Gain Sense | Internal 3 kΩ feedback node access; connect pin 14→6 for G = 100; leave pin 14 open for G = 1 |
| 3, 4 | +Offset Null / −Offset Null | Laser-trimmed input stage offset adjustment; 10 kΩ potentiometer between pins sets ±250 mV output trim range |
| 5, 6 | +Gain Drive / +R | Positive-side gain control path; pin 6 connects to internal 60.6 Ω resistor for G = 100 configuration |
| 7 | Ref | Output reference terminal; low-impedance connection required to preserve CMRR; summing point for output offset control |
| 8, 9 | −Input / +Input | Differential input pair; balanced topology minimizes EMI pickup; sensitive to PCB layout and cable impedance |
| 10, 11 | −Gain Drive / Sense | Negative-side gain path and output sense; Sense (pin 11) enables remote sensing at load to compensate for I·R drop |
| 12, 13 | Output / −R | Main output (pin 12); pin 13 connects to internal 60.6 Ω resistor completing G = 100 feedback loop |
| 14 | G | Gain select terminal; tied to pin 6 for G = 100; left floating for G = 1 |
Key Features
| Feature | Design Value |
|---|---|
| Current-feedback architecture | Enables 100 MHz gain-bandwidth product at G = 1000 while maintaining low distortion and fast settling |
| Built-in gain resistors | Eliminates external components for G = 1 and G = 100; laser-trimmed 3 kΩ resistors ensure ±0.1% matching and 50 ppm/°C TCR |
| Output sense & reference terminals | Allows closed-loop compensation of trace resistance and enables current-boosting inside feedback loop for >±40 mA drive |
| Distortion cancellation circuitry | Reduces THD+N to 0.0009% at 1 kHz, G = 100 - outperforms transformer-coupled mic preamps in professional audio |
| Copper lead frame DIP | Reduces θJA to 100 °C/W - sustains continuous operation at elevated ambient temperatures without derating |
Applications
| High-Quality Microphone Preamplifier | Moving-Coil Phono Preamplifier |
|---|---|
Use Scenario: Amplifying low-level balanced signals from studio condenser microphones with phantom power. IC Role / Device Role / Timing Role: Primary low-noise, low-distortion gain stage with G = 100, rejecting common-mode noise on XLR lines. Use Value: 1 nV/√Hz noise and 0.0009% THD+N enable transparent capture of subtle vocal harmonics and transient detail without transformer coloration. | Use Scenario: RIAA-equalized amplification of moving-coil cartridge outputs in high-end turntables. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier providing precise gain and CMRR before passive/active RIAA network. Use Value: >100 dB CMRR at 60 Hz eliminates hum from motor and power supply coupling; wide bandwidth preserves high-frequency extension. |
| Differential Bridge Receiver | Strain Gage Weigh Scale Front-End |
Use Scenario: Receiving differential signals from Wheatstone bridges in pressure or flow sensors. IC Role / Device Role / Timing Role: High-CMRR instrumentation amplifier rejecting common-mode noise induced by long sensor cables. Use Value: Input impedance of 60 MΩ || 5 pF and >100 dB CMRR up to 60 Hz ensure stable readings in electrically noisy industrial environments. | Use Scenario: Signal conditioning for load cell outputs in commercial/industrial weighing platforms. IC Role / Device Role / Timing Role: Precision gain stage converting mV-level bridge imbalances into robust analog outputs for ADC interfacing. Use Value: Gain error of 0.07% (typ) at G = 100 and 25 ppm/°C gain tempco ensure repeatable weight measurements across temperature variations. |
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, 0.01 µV/°C offset drift, 10 nV/√Hz noise, G = 1–1000 via single resistor; lower bandwidth (1.2 MHz at G = 100) | Better for DC-precision and high-Z sources (>100 kΩ); unsuitable for high-speed audio due to limited slew rate (0.4 V/µs) | Select INA114BP when ultra-low input bias current (<1 pA) and minimal offset drift dominate over noise and speed requirements. |
| AD625BN | Pin-compatible predecessor; 2.5 nV/√Hz noise, 0.002% THD+N, 100 kHz bandwidth at G = 100; no built-in gain resistors | Requires external 25 kΩ gain-set resistor; lacks INA103KP's distortion cancellation and copper lead frame thermal performance | Select AD625BN only for legacy designs where footprint compatibility is mandatory and noise/distortion specs are relaxed. |
Compared with INA114BP and AD625BN, the INA103KP uniquely balances ultra-low noise (1 nV/√Hz), high bandwidth (800 kHz at G = 100), and integrated gain resistors - making it optimal for audio-grade sensor interfaces where both dynamic fidelity and ease of implementation matter.
Availability
INA103KP is available at Aetrix Electronics and suitable for high-fidelity microphone preamplifiers, industrial weigh scale front-ends, and differential bridge receiver circuits requiring stable component supply across production lifecycles.
Supply support for INA103KP 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. TI is a global semiconductor leader focused on analog and embedded processing technologies.
The INA103KP belongs to TI's legacy instrumentation amplifier family designed specifically for high-dynamic-range signal acquisition in professional audio and precision measurement systems - emphasizing noise, distortion, and CMRR over general-purpose op-amp versatility.
FAQ
What is the maximum supply voltage rating for the INA103KP?
The INA103KP has an absolute maximum supply voltage rating of ±25 V. Operation within ±9 V to ±25 V is specified across its commercial temperature range (0°C to +70°C). Exceeding ±25 V risks permanent damage per the Absolute Maximum Ratings table. For reliable long-term operation, TI recommends staying within ±24 V under worst-case conditions.
Does the INA103KP require external resistors to achieve G = 1 or G = 100?
No - the INA103KP includes laser-trimmed internal resistors enabling G = 1 (pin 14 left unconnected) and G = 100 (pin 14 connected to pin 6) without external components. External RG resistors are optional and used only when non-standard gains are needed using the equation G = 1 + 6 kΩ/RG.
Can the INA103KP drive a 600 Ω load at full output swing?
Yes - the INA103KP delivers ±12 V into 600 Ω at ±15 V supplies and ±21 V into 600 Ω at ±25 V supplies, with ±40 mA continuous output current capability. Its short-circuit current is ±70 mA, confirming robust drive strength for professional audio line-driving and active filter buffering applications.
How does the INA103KP handle input overdrive and recovery?
The INA103KP incorporates fold-back protection that cleanly limits output during overload instead of inverting polarity. Recovery time from 50% overdrive is 1 µs, ensuring rapid return to linear operation after transient clipping - critical for maintaining signal integrity in live audio and fast-sampling sensor systems.
Is the INA103KP RoHS compliant and what is its moisture sensitivity level?
Yes - the INA103KP (PDIP package) is RoHS compliant with NIPDAU lead finish. As a through-hole DIP device, it has no MSL rating - moisture sensitivity level (MSL) applies only to surface-mount packages like the SOIC-based INA103KU. No bake or dry-pack requirements apply to INA103KP.
INA103KP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 16-PDIP
INA103KP FAQ
1.How can I place an order for INA103KP through Aetrix?
Please submit a Request for Quotation (RFQ) for INA103KP 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 INA103KP reliable?
The price and inventory of INA103KP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA103KP is usually 5 days.
3.What payment methods are accepted for INA103KP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA103KP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA103KP?
INA103KP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA103KP 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 INA103KP?
For technical support, including INA103KP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA103KP requirements.
6.How does Aetrix verify that INA103KP is sourced from the original manufacturer or authorized distributors?
All INA103KP 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 INA103KP meets industry standards.
7.What is the process for return or replacement of INA103KP?
All INA103KP units undergo pre-shipment inspection (PSI). If there is an issue with INA103KP, 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 INA103KP part is unused and in its original packaging.
Return procedure for INA103KP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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