Texas Instruments OPA602BP

Overview

OPA602BP from Texas Instruments is a precision dielectrically isolated FET (Difet®) operational amplifier optimized for high-speed, low-input-bias-current signal conditioning in instrumentation and data conversion systems. It delivers 6.5MHz gain bandwidth, 35V/µs slew rate, ±1000µV max input offset voltage, and ±1pA max input bias current at +25°C, enabling accurate pulse amplification and sensor interface in ultrasound and professional audio front-ends.

For engineers reviewing the OPA602BP datasheet, OPA602BP pinout, OPA602BP application, or OPA602BP equivalent, key selection considerations include its DIP-8 package, unity-gain stability with 1500pF capacitive load drive, laser-trimmed offset performance, and cascode input architecture preserving low bias current across full common-mode range.

Technical Context

The OPA602BP uses monolithic Difet® construction to combine bipolar-like precision with FET-level input impedance. Its cascode input stage maintains ±1pA bias current over ±10.2V common-mode range while achieving 88dB minimum CMRR and 100dB typical open-loop DC gain.

Designed for unity-gain stability, it drives up to 1500pF without oscillation and settles to 0.01% in 1µs under 10V step with 500pF load. All AC specifications-including 6.5MHz GBW and 35V/µs slew rate-are guaranteed with 1kΩ || 500pF load per datasheet test conditions.

Key Specifications

Pinout & Package

OPA602BP is housed in an 8-pin plastic dual-in-line package (PDIP-8, JEDEC MS-001), with 0.300-inch body width and through-hole mounting. Pin 1 is located at the left end of the top row when viewing the top marking side.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision high-speed op amp applications.

Compared with OPA602BP, OPA627AP trades offset trim flexibility for superior AC performance, while AD827JN sacrifices input impedance for raw speed-making OPA602BP uniquely suited for precision, high-Z, trimmable analog front-ends.

Availability

OPA602BP is available at Aetrix Electronics and suitable for precision instrumentation, medical equipment, and professional audio applications requiring stable component supply with long-term DIP-8 availability and RoHS-compliant green packaging.

Supply support for OPA602BP 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 precision op amp innovation.

The OPA602BP belongs to TI's legacy precision Difet® op amp family, engineered specifically for applications demanding simultaneous high speed, ultra-low input bias current, and DC accuracy-such as ultrasound receivers and laboratory instrumentation.

FAQ

What is the maximum capacitive load the OPA602BP can drive while remaining stable?

The OPA602BP is specified to drive up to 1500pF in unity-gain configuration without oscillation or excessive peaking. This capability is verified per datasheet test conditions using a 1kΩ || 500pF load. For loads exceeding 1500pF, external isolation resistance or feedback network compensation is required to maintain phase margin above 45°.

Does the OPA602BP require external offset nulling, and how is it implemented?

Yes, the OPA602BP provides dedicated offset trim pins (1 and 5) for manual nulling using a 100kΩ potentiometer. This feature enables adjustment of input offset voltage to <±100µV in critical DC-coupled applications like strain gauge bridges. The typical trim range is ±10mV, and the circuit must follow Figure 2 in the SBOS155A datasheet to avoid degrading bias current performance.

Can the OPA602BP operate from a single supply, and what are the limitations?

The OPA602BP is specified for dual-supply operation (±5V to ±18V) and does not support true single-supply operation. Its input common-mode range extends to ±10.2V, but the output cannot swing to either rail-minimum output swing is ±11.5V into 1kΩ with ±15V supplies. For single-supply designs, a level-shifting reference or rail-to-rail op amp alternative is required.

How does the OPA602BP's Difet® construction differ from standard JFET or CMOS op amps?

Difet® (dielectrically isolated FET) technology integrates FET input transistors on a dielectric substrate, eliminating parasitic junction leakage paths. This achieves ±1pA bias current without the high 1/f noise typical of CMOS inputs, and avoids the gate leakage sensitivity of discrete JFETs. The result is stable sub-picoampere bias current across temperature and common-mode voltage-unattainable with conventional JFET or CMOS processes.

Is the OPA602BP suitable for driving ADC inputs, and which parameters are most critical?

Yes, the OPA602BP is widely used to drive SAR and sigma-delta ADC inputs. Critical parameters include its 1µs 0.01% settling time (ensuring accurate sampling of fast steps), 1500pF capacitive load drive (allowing direct connection to ADC input capacitance), and low 13nV/√Hz noise (preserving SNR in high-resolution converters). Input bias current <1pA also prevents errors in high-impedance RC filter networks.