Texas Instruments INA217AIP

Overview

INA217AIP from Texas Instruments is a low-noise, low-distortion instrumentation amplifier optimized for professional audio signal conditioning. It delivers 1.3 nV/√Hz input voltage noise at 1 kHz, 0.004% THD+N at G=100, and 800 kHz bandwidth at G=100, operating from ±4.5 V to ±18 V supplies. Its primary circuit role is differential-to-single-ended amplification of low-level balanced microphone and transducer signals in high-fidelity preamplifier stages.

For engineers reviewing the INA217AIP datasheet, INA217AIP pinout, INA217AIP application, or INA217AIP equivalent, key selection considerations include its gain-setting resistor architecture (G = 1 + 10 kΩ/R_G), DIP-8 package compatibility with legacy SSM2017 designs, –40°C to 85°C industrial temperature rating, and differential input stage requiring precise layout for >100 dB CMR performance.

Technical Context

The INA217AIP implements a classical three-op-amp instrumentation amplifier topology with current-feedback architecture enabling wide bandwidth and fast settling (2 µs to 0.01% at G=100). Its internal 5-kΩ laser-trimmed feedback resistors (±0.2% tolerance, ±25 ppm/°C TCR) define gain accuracy alongside external RG, while distortion cancellation circuitry suppresses harmonic content below 0.004% THD+N.

Designed specifically for audio-grade signal chains, it features differential inputs with 60 MΩ || 2 pF impedance, rail-to-rail output swing capability (±1.8 V from rails at ±15 V supply), and high output drive (±60 mA short-circuit current). Input bias current (2–12 µA) and noise optimization are tuned for source impedances ≤200 Ω, making it unsuitable for high-Z sensor interfaces.

Key Specifications

Pinout & Package

INA217AIP is supplied in an 8-pin PDIP (Plastic Dual In-line Package) with 9.81 mm × 6.35 mm body size and through-hole mounting. Pin 1 is located at the left end of the top row when viewing the top marking side, with notch or dot indicating orientation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar instrumentation amplifier applications.

Compared with INA217AIP, INA163UA offers smaller footprint and lower power but lacks DIP-8 compatibility, while AD8221ARMZ provides superior noise and integrated gain options but requires redesign for REF and RG pin usage-neither is pin-compatible, though both serve overlapping audio and instrumentation roles.

Availability

INA217AIP is available at Aetrix Electronics and suitable for professional audio preamplifiers, industrial transducer signal conditioning, and broadcast equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for INA217AIP 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 is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in precision amplifiers, data converters, and power management ICs.

The INA217AIP belongs to TI's precision instrumentation amplifier product line, designed specifically for high-fidelity audio signal acquisition where low noise, low distortion, and robust common-mode rejection are critical.

FAQ

What is the maximum gain achievable with INA217AIP?

The INA217AIP supports gains from 1× to 10,000× using the external resistor equation G = 1 + 10 kΩ/R_G. At G = 10,000, RG = 1 Ω is required; however, practical limits arise from resistor tolerance, thermal drift, and PCB parasitics. For stable operation above G = 1000, use low-TCR metal-film resistors and minimize trace length to RG pins. The INA217AIP datasheet specifies gain error up to ±0.5% at G = 1000 under nominal conditions.

Does INA217AIP support single-supply operation?

No, INA217AIP is specified exclusively for dual-supply operation from ±4.5 V to ±18 V. Its internal architecture requires symmetrical positive and negative rails to bias the differential input stage and enable rail-swinging output. Attempting single-supply use (e.g., 0 V and +15 V) will result in incorrect biasing, loss of common-mode range, and potential output clipping. For single-supply applications, consider TI's INA333 or ADI's AD8421 as alternatives.

How does the REF pin function in INA217AIP?

The REF pin (Pin 5) in INA217AIP serves as a reference input that directly offsets the output voltage: V_OUT = G × (V_IN+ – V_IN–) + V_REF. It must be driven by a low-impedance source (<1 Ω typical) to maintain >100 dB CMR; series resistance degrades rejection. Common uses include setting DC output level, implementing servo loops for offset nulling, or injecting calibration signals. The INA217AIP does not generate internal reference voltage-it relies entirely on external control of this node.

Can INA217AIP replace SSM2017 in existing designs?

Yes, INA217AIP is explicitly designed as a direct replacement for Analog Devices' SSM2017 in DIP-8 format, sharing identical pinout, electrical characteristics, and package dimensions. TI confirms functional equivalence including gain equation, noise, THD+N, and supply requirements. No PCB changes are needed; however, verify that external RG resistor values match original SSM2017 configurations, as minor differences in internal resistor matching may affect absolute gain accuracy.

What layout practices are critical for optimal INA217AIP performance?

Optimal INA217AIP layout requires strict adherence to analog best practices: place 0.1-µF ceramic bypass capacitors directly at V+ and V– pins; route VIN+ and VIN– traces as short, matched, and shielded differential pairs; isolate REF pin from noisy traces; use solid ground plane beneath the device; and avoid routing supply or output traces parallel to inputs. TI's SBOS247C datasheet Figure 18 provides validated layout examples. Failure to follow these guidelines risks oscillation, degraded CMR, or increased THD+N.