Texas Instruments TL971IDRG4

Overview

TL971IDRG4 from Texas Instruments is a single-channel rail-to-rail output operational amplifier optimized for low-noise audio preamplification and portable battery-powered systems. It delivers 4.4 nV/√Hz input voltage noise, ±2.4 V output swing at ±2.5 V supply, 10.6 MHz gain-bandwidth product, and operates from 2.7 V to 12 V supply. It is used in high-fidelity headphone amplifiers and sensor signal conditioning stages where dynamic range and low distortion are critical.

For engineers reviewing the TL971IDRG4 datasheet, TL971IDRG4 pinout, TL971IDRG4 application, or TL971IDRG4 equivalent, key selection considerations include its rail-to-rail output capability under low-voltage operation, verified 4.4 nV/√Hz noise floor at 100 kHz, guaranteed performance across –40°C to +125°C, and SOIC-8 package compatibility with standard PCB assembly processes.

Technical Context

The TL971IDRG4 employs a complementary-input-stage architecture enabling true rail-to-rail output swing while maintaining stable phase margin (≥60°) into 100 pF capacitive loads. Its input stage uses paralleled NMOS and PMOS differential pairs to extend common-mode range to both supply rails, with transition-region behavior documented for design-aware biasing.

It is fully specified for dual-supply operation (±1.35 V minimum) or single-supply use (2.7 V to 12 V), supports unity-gain stable configurations, and exhibits low input offset drift (±0.25 μV/°C) and ultra-low input bias current (±0.01 nA typical) - critical for high-impedance sensor interfaces and precision DC-coupled audio paths.

Key Specifications

Pinout & Package

The TL971IDRG4 is housed in an 8-pin SOIC (D) package with nominal dimensions 4.90 mm × 6.00 mm and gull-wing leads compatible with standard reflow profiles (MSL Level-1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA1671IDR and LMV721IDR, TL971IDRG4 uniquely balances ultra-low noise (4.4 nV/√Hz), rail-to-rail output at 2.7 V, and moderate quiescent current (2.8 mA) - making it the optimal choice for portable audio and precision sensor interfaces where both dynamic range and power efficiency are simultaneously constrained.

Availability

TL971IDRG4 is available at Aetrix Electronics and suitable for portable audio equipment, industrial sensor interfaces, and professional audio line drivers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TL971IDRG4 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 leader delivering analog and embedded processing solutions for industrial, automotive, and consumer applications.

The TL97x family was designed specifically for low-noise, rail-to-rail output amplification in battery-powered and space-constrained systems - emphasizing audio fidelity, sensor accuracy, and robust operation from 2.7 V to 12 V.

FAQ

What is the maximum supply voltage rating for TL971IDRG4?

The absolute maximum supply voltage for TL971IDRG4 is 15 V, but the recommended operating range is 2.7 V to 12 V. Exceeding 12 V risks exceeding thermal limits and degrading long-term reliability, while operation below 2.7 V may cause loss of rail-to-rail output capability and increased distortion. The device is fully characterized from –40°C to +125°C within the 2.7–12 V window.

Does TL971IDRG4 support true rail-to-rail input operation?

No, TL971IDRG4 features rail-to-rail *output* swing only. Its input common-mode range extends from VCC– + 1.15 V to VCC+ – 1.15 V - not to the rails. This limitation is intentional to maintain low input bias current and high CMRR. For true rail-to-rail input operation, TI recommends the OPA990 or TLV9061 families, which use different input architectures.

What is the typical input offset voltage of TL971IDRG4 and how does it vary with temperature?

The typical input offset voltage of TL971IDRG4 is ±0.21 mV at 25°C, with a drift of ±0.25 μV/°C. Over the full –40°C to +125°C operating range, total offset variation remains within ±6 μV - significantly tighter than legacy audio op-amps. This stability enables DC-coupled microphone preamps and precision sensor buffers without frequent recalibration.

Can TL971IDRG4 drive a 600 Ω load in professional audio line-driver applications?

Yes, TL971IDRG4 can drive a 600 Ω load with full rail-to-rail output swing when supplied with ±5 V. At ±2.5 V supply, it delivers ±2.4 V into 2 kΩ; into 600 Ω, output swing compresses to approximately ±2.1 V due to output stage headroom and current limitations. For sustained 10 Vpp into 600 Ω, dual ±5 V supply is recommended - confirmed by Figure 5-12 and Figure 5-13 in the datasheet.

Is TL971IDRG4 pin-compatible with other members of the TL97x family?

No, TL971IDRG4 (single-channel, SOIC-8) is not pin-compatible with TL972 (dual) or TL974 (quad) in the same package - their pinouts differ fundamentally. However, the TL971IDRG4 shares identical pin functions (IN+, IN–, OUT, VCC+, VCC–) with the TL971DBVR (SOT-23-5) variant, though the SOIC-8 version includes three NC pins (6–8) absent in the 5-pin version. Always verify pin mapping using Table 4-1 in the official datasheet.