Texas Instruments OPA627BM

Overview

OPA627BM from Texas Instruments is a precision JFET-input operational amplifier designed for high-speed, low-noise analog signal conditioning in demanding instrumentation and data acquisition systems. It delivers 4.5 nV/√Hz input voltage noise at 10 kHz, ±100 µV maximum input offset voltage, 0.8 µV/°C max drift, and 550 ns settling time to 0.01% - enabling accurate amplification of high-impedance sensor outputs and DAC buffers.

For engineers reviewing the OPA627BM datasheet, OPA627BM pinout, OPA627BM application, or OPA627BM equivalent, this page provides verified specifications, SOIC-8 and TO-99 package details, thermal performance metrics, real-world application contexts, and two validated alternative parts with documented functional trade-offs for precision analog design.

Technical Context

The OPA627BM uses dielectrically isolated complementary NPN/PNP process technology with laser-trimmed input circuitry to achieve bipolar-level accuracy without sacrificing FET input impedance. Its unity-gain stability enables direct use in buffer, integrator, and active filter configurations without external compensation.

It operates across ±4.5 V to ±18 V dual supplies (or 9–36 V single supply), supports common-mode input range up to ±11.5 V, and maintains ≤5 pA input bias current over –55°C to +125°C - critical for high-Z transducer interfaces and long-term DC stability in aerospace and test equipment.

Key Specifications

Pinout & Package

OPA627BM is available in two industry-standard packages: 8-pin SOIC (D package) and 8-pin metal TO-99 (LMC package). Both are hermetically sealed for reliability in harsh environments. Pin functions are identical across packages except for offset trim terminals (TO-99 only).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision JFET op amp applications.

Compared with OPA627AM and OPA637BM, the OPA627BM uniquely balances guaranteed low offset (±100 µV), unity-gain stability, and extended temperature operation - making it the only choice for high-fidelity, single-supply-capable precision buffers in mission-critical analog subsystems.

Availability

OPA627BM is available at Aetrix Electronics and suitable for precision instrumentation, fast data acquisition, and high-impedance sensor amplification requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for OPA627BM 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 specializing in analog and embedded processing technologies, with decades of heritage in high-performance op amp design and manufacturing.

The OPA627BM belongs to TI's OPA6x7 precision JFET op amp family, engineered specifically for applications demanding simultaneous low noise, low drift, high speed, and unity-gain stability - such as metrology, medical imaging, and test & measurement equipment.

FAQ

What is the maximum operating temperature range for the OPA627BM?

The OPA627BM is specified for operation from –55°C to +125°C, with electrical characteristics guaranteed across this full range. This extended temperature qualification makes it suitable for aerospace, downhole oil & gas, and military applications where ambient conditions exceed commercial or industrial limits. The OPA627BM achieves this via die-level trimming and hermetic packaging in both SOIC and TO-99 variants.

Is the OPA627BM unity-gain stable, and why does that matter?

Yes, the OPA627BM is explicitly unity-gain stable, meaning it remains stable with closed-loop gain = 1 without external compensation components. This is critical for buffer, voltage follower, and integrator circuits where instability would cause oscillation or inaccurate settling. Unlike the OPA637BM (which requires gain ≥5), the OPA627BM eliminates design risk in low-gain configurations - a key differentiator confirmed in Section 3 and Table 4-1 of the SBOS165C datasheet.

What package options are available for the OPA627BM?

The OPA627BM is offered in two packages: 8-pin SOIC (D package) and 8-pin metal TO-99 (LMC package). Both share identical pinouts for primary signal and power terminals (pins 2, 3, 4, 6, 7), while TO-99 adds offset trim pins (1 and 5) and excludes NC pins 8. The SOIC version supports automated assembly; the TO-99 offers superior thermal performance (RθJA = 200°C/W) and hermetic sealing for high-reliability environments.

How does the OPA627BM's input bias current compare to other precision op amps?

The OPA627BM specifies ≤5 pA maximum input bias current over its full –55°C to +125°C operating range - significantly lower than bipolar-input op amps (typically nA range) and competitive with best-in-class JFET devices. This enables accurate amplification of signals from ultra-high-impedance sources like photodiodes, pH electrodes, and piezoelectric sensors without loading-induced errors. Measured values remain ≤1 pA at 25°C per Section 5.7.

Can the OPA627BM drive heavy capacitive loads, and what is the recommended layout?

The OPA627BM is not optimized for direct capacitive loads >100 pF; driving larger loads (e.g., cables or ADC inputs) requires isolation via a series resistor (≥50 Ω) placed close to the output pin. Layout best practices include: (1) placing 0.1 µF ceramic + 10 µF bulk decoupling caps within 1 cm of V+ and V– pins, (2) using ground planes under signal traces, and (3) guarding the +IN/–IN nodes in high-gain stages. These guidelines are detailed in Sections 7.3 and 7.4 of the SBOS165C datasheet.