Texas Instruments TL972IPWR

Overview

TL972IPWR from Texas Instruments is a dual 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 single or dual 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 TL972IPWR datasheet, TL972IPWR pinout, TL972IPWR application, or TL972IPWR 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 –40°C to +125°C performance, and TSSOP-8 package compatibility with space-constrained PCB layouts.

Technical Context

The TL972IPWR implements a complementary-input-stage architecture enabling true rail-to-rail output swing while maintaining stable phase margin (≥60°) across 2.7–12 V supply range and capacitive loads up to 250 pF. Its input stage uses paralleled NMOS and PMOS differential pairs to extend common-mode range to both rails, with transition region management ensuring consistent CMRR (90 dB typ.) and PSRR (70 dB typ.) outside the ±1 V mid-supply zone.

It features low input bias current (±0.01 nA typ.), low input offset voltage (±0.21 mV typ.), and high open-loop gain (125 dB typ.), supporting precision DC-coupled configurations. The device draws only 2.8 mA per amplifier at 25°C, enabling efficient operation in always-on sensor front-ends and portable audio codecs without thermal derating.

Key Specifications

Pinout & Package

TSSOP-8 (PW) package: 3.00 mm × 6.40 mm body, 0.65 mm lead pitch, exposed thermal pad (not electrically connected), RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual low-noise operational amplifier applications.

Compared with OPA2134PA and LMV792MMX, TL972IPWR uniquely balances rail-to-rail output, 4.4 nV/√Hz noise, dual-supply operation down to ±1.35 V, and TSSOP-8 footprint - making it optimal for portable audio and industrial sensor interfaces requiring both low voltage and high fidelity.

Availability

TL972IPWR is available at Aetrix Electronics and suitable for portable audio equipment, industrial sensor signal chains, and professional audio interface modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TL972IPWR 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 TL97x family was designed specifically for battery-powered audio and sensor signal conditioning applications demanding rail-to-rail output swing, ultra-low noise, and wide supply voltage flexibility - targeting portable consumer electronics and industrial measurement systems.

FAQ

What is the maximum supply voltage rating for TL972IPWR?

The absolute maximum supply voltage for TL972IPWR is 15 V across VCC+ and VCC– terminals. However, the recommended operating range is 2.7 V to 12 V. Exceeding 12 V may degrade long-term reliability and is not characterized for performance parameters such as noise, offset, or bandwidth. Always use 0.1 µF ceramic bypass capacitors at each supply pin when operating TL972IPWR near its upper voltage limit.

Does TL972IPWR support true rail-to-rail input operation?

No, TL972IPWR features rail-to-rail *output* swing only. Its input common-mode voltage range extends from VCC– + 1.15 V to VCC+ – 1.15 V, meaning it does not accept signals within 1.15 V of either rail. This limitation is due to its complementary-input-stage architecture, which trades full rail-to-rail input capability for improved PSRR and lower distortion. For applications requiring true rail-to-rail input, consider TI's OPAx320 series instead of TL972IPWR.

Can TL972IPWR drive capacitive loads without oscillation?

Yes, TL972IPWR is internally compensated for stable operation with capacitive loads up to 250 pF when using unity-gain configuration. Phase margin remains ≥60° across 2.7–12 V supply range and –40°C to +125°C temperature. For loads >250 pF, add a small series resistor (e.g., 10–50 Ω) between output and capacitance to isolate reactive feedback. This behavior is verified in Figure 5-7 of the TL972IPWR datasheet and applies directly to the TL972IPWR device.

What is the typical input bias current of TL972IPWR at 25°C?

The typical input bias current of TL972IPWR is ±0.01 nA at 25°C, with a maximum of 1000 nA over the full –40°C to +125°C temperature range. This ultra-low bias current minimizes voltage errors in high-impedance sensor interfaces, such as photodiode transimpedance amplifiers or pH electrode buffers. The value is measured with VICM = 0 V and VO = 0 V, and is confirmed in Section 5.6 Electrical Characteristics of the official TL972IPWR datasheet.

Is TL972IPWR pin-compatible with other dual op-amps in TSSOP-8 package?

TL972IPWR uses standard TSSOP-8 pinout (pin 1 = OUT1, pin 2 = IN1–, pin 3 = IN1+, pin 4 = VCC–, pin 5 = VCC+, pin 6 = IN2+, pin 7 = IN2–, pin 8 = OUT2), matching industry conventions for dual op-amps. However, electrical compatibility requires verification of supply range, input/output swing, and stability characteristics. For example, while LMV792MMX shares the same pinout and package, it lacks dual-supply capability and rail-to-rail input - so direct substitution without circuit review is not recommended for TL972IPWR.