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ina146ua
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Texas Instruments Differential OpAmps, SOIC-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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Texas Instruments · Differential OpAmps · SOIC-8
INA146UA from Texas Instruments, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | Ref | input | Reference input for the output amplifier A2. Voltage applied here is summed with the output signal and sets the output zero reference; source impedance should be less than 10Ω to preserve CMR. Also serves as an offset trim node (±15mV RTI adjustment range with the suggested trim network). |
| 2 | VIN- | input | Inverting differential signal input. Connects through internal R1 = 100kΩ (with R2 = 10kΩ feedback) to the A1 difference-amplifier inverting node; input differential/common-mode voltages up to ±100V are supported (voltage divider ratio 10:1). Input impedance to this pin is approximately 91.7kΩ differential. |
| 3 | VIN+ | input | Non-inverting differential signal input. Connects through internal R3 = 100kΩ to A1's non-inverting node (with R4 = 10kΩ to Ref); supports ±100V signal inputs. Differential input impedance approximately 110kΩ; common-mode impedance approximately 55kΩ. |
| 4 | V- | power_in | Negative supply rail. Accepts dual supplies of ±2.25V to ±18V (operating down to ±1.35V) or single-supply operation with V+ up to 36V above V-. Bypass with 0.1µF close to the pin. |
| 5 | RG | passive | Inverting input of the output buffer amplifier A2 and gain-set node. External resistors RG1 (to ground) and RG2 (to VO) set the overall gain G = 0.1 × (1 + RG2/RG1); RG2 = 10kΩ with RG1 open gives unity buffer gain (overall G = 0.1V/V). Design for approximately 10kΩ parallel resistance for proper bias current cancellation. |
| 6 | VO | output | Output of the amplifier chain (A2 output). Delivers ±15mA short-circuit current, stable with up to 1000pF load capacitance. Output swing is (V-)+0.15V to (V+)-1V at RL=100kΩ (G=1). |
| 7 | V+ | power_in | Positive supply rail. Accepts dual supplies of ±2.25V to ±18V or single supply 4.5V to 36V referenced to V-. Quiescent current is typically ±570µA. Bypass with 0.1µF close to the pin. |
| 8 | VO1 | output | Output of the first-stage difference amplifier A1, taken before the internal 10kΩ series resistor (R5) that drives A2's non-inverting input. Available for applications such as filtering (e.g. capacitor at VO1 forms an active filter with R5) or precision current-source configurations. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | Op-amp/Cmp |
| Pins | 8 |
Ordering variants
INA146UAINA146UA/2K5INA146UAE4INA146UA/2K5E4
CAD (KiCad official)
- Symbol:
INA146UA - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (None pp, sha256
1bb150074f605160, retrieved 2026-08-17, tier: lcsc) - Extractor:
ds2sf(Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate. - CAD: KiCad official libraries (CC-BY-SA 4.0).