INA118U Texas Instruments amplifiers (SOIC-8) In Stock
INA118U is a precision instrumentation amplifier by Texas Instruments in SOIC-8 package, featuring 110dB CMRR, 50µV max offset voltage, gain set by single resistor from 1 to 10000. Priced from $3.03, available for immediate inquiry, ships globally, MOQ 1.
- Manufacturer
- Texas Instruments
- Package
- SOIC-8
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- INA118U Datasheet PDF
- Category
- amplifiers
- Price
- From $3.0291(MOQ 1)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Single external resistor sets gain 1 to 10,000
- 110dB min CMRR for exceptional noise rejection
- 50µV max input offset voltage for high precision
- ±1.35V to ±18V wide supply range
- Low 5µV/°C offset drift for stable measurements
- 8-pin SOIC package for easy PCB integration
Applications
INA118U is widely used in precision analog signal acquisition: medical instrumentation (ECG, patient monitoring), industrial process control with bridge sensors (strain gauges, pressure transducers), and data acquisition front-ends requiring high accuracy differential amplification.
Specifications
| supply_voltage | ±1.35 to ±18V |
| cmrr_min | 110dB |
| input_offset_voltage_max | 50µV |
| gain_range | 1 to 10000 |
| offset_drift | 5µV/°C |
| quiescent_current | 350µA |
| bandwidth | 800kHz |
| operating_temperature | -40 to +85°C |
| Package | SOIC-8 |
Compliance & Regulatory
| RoHS Status | Compliant |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for INA118U:
Industry-standard pin-compatible instrumentation amplifier, SOIC-8, 7nV/√Hz noise, excellent for precision bridge applications
Pin-compatible, higher bandwidth (4MHz G=1) variant in SOIC-8, suitable when wider signal bandwidth is required
Frequently Asked Questions
How do I set the gain on the INA118U?
Gain is set by a single external resistor (RG) connected between pins 1 and 8. The formula is G = 1 + (50kΩ / RG). For example, to achieve a gain of 100, use RG = 505Ω. No resistor (open pins) gives unity gain (G=1), and a 5.05Ω resistor gives G=10,000.
Which applications is the INA118U best suited for?
The INA118U excels in high-accuracy differential signal measurement: bridge sensor amplification (strain gauges, load cells, pressure transducers), medical instrumentation (ECG front-ends), industrial process control, and battery-powered portable data acquisition due to its low 350µA quiescent current and wide supply range.
What are the pin-compatible or drop-in alternatives to INA118U?
Pin-compatible alternatives include the INA128U and INA129U (also Texas Instruments, SOIC-8, with higher bandwidth) and the AD8221ARZ from Analog Devices. The INA128U offers lower noise (8nV/√Hz vs 9nV/√Hz) and wider bandwidth (1.3MHz), making it suitable for faster signal chains on the same footprint.
Does the INA118U support single-supply operation?
Yes. While rated for ±1.35V to ±18V dual-supply, it operates on a single supply as low as 2.7V (e.g., 0V and +2.7V). Input common-mode range must be kept within supply rails minus typical headroom (~1.2V), so designers should verify input signal levels when using single-supply configurations.
Is the INA118U RoHS compliant, and what is the package marking?
Yes, the INA118U is RoHS compliant and lead-free. It is supplied in an 8-pin SOIC (SO-8) package. The 'U' suffix denotes the SOIC-8 package variant. Texas Instruments also offers the INA118P in a through-hole DIP-8 package if PCB space allows.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $17.0550 | $17.05 |
| 16+ | $15.7759 | $252.41 |
| 25+ | $15.6600 | $391.50 |
| 62+ | $3.2754 | $203.07 |
| 80+ | $3.1523 | $252.18 |
| 100+ | $3.0291 | $302.91 |
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