Texas Instruments OPA602AP

Overview

OPA602AP from Texas Instruments is a precision dielectrically isolated FET (Difet®) operational amplifier optimized for high-speed, low-input-bias-current applications. It delivers 6.5MHz gain bandwidth, 35V/µs slew rate, ±250µV max input offset voltage, and ±1pA max input bias current at 25°C, enabling accurate signal conditioning in ultrasound front-ends and professional audio summing amplifiers.

For engineers reviewing the OPA602AP datasheet, OPA602AP pinout, OPA602AP application, or OPA602AP equivalent, key selection criteria include its DIP-8 package, ±18V supply range, unity-gain stability with 1500pF capacitive load drive, and laser-trimmed offset performance across –25°C to +85°C ambient operation.

Technical Context

The OPA602AP uses monolithic Difet® construction to combine bipolar-like precision with FET-level input impedance. Its cascode input stage maintains ±1pA bias current over full common-mode range (±10.2V), while laser trimming ensures ±2000µV max offset at 25°C in the P-package variant.

Designed for unity-gain stability, it achieves 1µs settling to 0.01% with 10V step into 500pF load and drives capacitive loads up to 1500pF without oscillation-critical for data acquisition multiplexer buffers and DAC output stages where dynamic accuracy and phase margin are tightly coupled.

Key Specifications

Pinout & Package

DIP-8 plastic dual-in-line package (JEDEC MS-001), 0.300" wide body, through-hole mounting. Pin 1 identified by notch or dot; pins 1–4 on left side, 5–8 on right side (top view).

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA627AP and AD825ARZ, the OPA602AP uniquely balances sub-picoampere bias current, DIP-8 through-hole compatibility, and 6.5MHz bandwidth-making it the only option for retrofitting precision analog stages in legacy medical and test equipment without PCB rework.

Availability

OPA602AP is available at Aetrix Electronics and suitable for ultrasound beamforming, professional audio summing, and medical ECG front-end applications requiring stable component supply with long-term industrial lifecycle support.

Supply support for OPA602AP 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 OPA602AP belongs to TI's legacy high-speed precision op amp family, engineered specifically for applications demanding both FET-level input impedance and bipolar-grade DC accuracy-such as medical imaging, test instrumentation, and studio audio.

FAQ

What is the maximum capacitive load the OPA602AP can drive without instability?

The OPA602AP is specified to drive up to 1500pF while maintaining unity-gain stability and >45° phase margin. This capability eliminates the need for series isolation resistors when interfacing with ADC inputs or long PCB traces, unlike many high-speed op amps that require external compensation beyond 100pF. The OPA602AP's internal compensation and cascode input architecture enable this robust capacitive drive performance.

Does the OPA602AP require external offset trim for precision applications?

Yes-the OPA602AP provides dedicated offset trim pins (1 and 5) to support manual nulling using a 100kΩ potentiometer, as shown in Figure 2 of the SBOS155A datasheet. While its ±2000µV max offset at 25°C is tighter than many FET op amps, applications requiring sub-100µV DC error-such as high-resolution weigh scale front-ends-benefit from this trim capability. The OPA602AP's laser-trimmed core reduces required adjustment range versus untrimmed alternatives.

Can the OPA602AP operate from a single supply?

No-the OPA602AP is designed exclusively for split-supply operation from ±5V to ±18V. Its input common-mode range extends to ±10.2V at ±15V supplies, but it lacks rail-to-rail input or output capability required for true single-supply use. Attempting single-supply operation (e.g., 0V and +15V) will violate absolute maximum ratings and cause malfunction. For single-supply designs, consider TI's OPA350 or OPA2350 families instead of the OPA602AP.

What is the thermal resistance (θJA) of the OPA602AP in its DIP-8 package?

According to the SBOS155A datasheet, the OPA602AP in the P-package (DIP-8) has a junction-to-ambient thermal resistance (θJA) of 200°C/W under standard JEDEC test conditions. This value assumes a 1-inch² copper pad on a single-layer board. In practice, adding thermal vias and larger copper pours can reduce effective θJA by 30–50%, critical for maintaining the +175°C max junction temperature during continuous ±15V operation at full output swing.

How does the OPA602AP's input guarding requirement differ from standard op amps?

The OPA602AP's ±1pA input bias current makes it highly susceptible to PCB surface leakage-so much so that the datasheet mandates input guarding (Figure 1): a low-impedance copper trace surrounding Pins 2 and 3, connected to the same potential as the input source. Unlike standard op amps where guarding is optional, omitting this for the OPA602AP can introduce >100pA of effective bias current error. The OPA602AP's Difet® process demands this layout discipline to achieve its specified picoampere performance.