Texas Instruments OPA211SKGD1

Overview

OPA211SKGD1 from Texas Instruments is a high-temperature precision operational amplifier in bare die (KGD) form, delivering 1.1 nV/√Hz input voltage noise density at 1 kHz, 27 V/μs slew rate, and 700 ns 16-bit settling time across ±2.25 V to ±18 V supplies. It operates from –55°C to 210°C and serves as a loop filter amplifier in PLL systems or as a front-end driver for 16-bit ADCs in down-hole drilling instrumentation.

For engineers reviewing the OPA211SKGD1 datasheet, OPA211SKGD1 pinout, OPA211SKGD1 application, or OPA211SKGD1 equivalent, key selection criteria include its extreme-temperature operation, ultra-low noise performance, rail-to-rail output swing, and verified 210°C junction lifetime - critical for high-reliability analog signal conditioning in harsh-environment sensing and control systems.

Technical Context

The OPA211SKGD1 implements a SiGe bipolar process with 180 transistors, enabling unity-gain stability and controlled baseline performance across its full –55°C to 210°C operating range. Its internal architecture supports rail-to-rail output swing while maintaining low THD+N (–136 dB at G = 1, f = 1 kHz) and high open-loop gain (114 dB typical).

It features integrated ESD protection via back-to-back input diodes and edge-triggered absorption circuitry, with shutdown functionality referenced to V+ (valid high = V+ – 0.35 V). The device exhibits no phase reversal and sustains 30 mA output current into resistive loads.

Key Specifications

Pinout & Package

KGD (Known Good Die) package - unmounted bare silicon die with metallized bond pads on 15-mil-thick silicon substrate; intended for hybrid assembly or custom packaging in high-reliability modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA211SKGD1, the HKQ and HKJ packaged variants offer identical electrical performance and temperature rating but eliminate die-level handling and bonding complexity - making them preferable for volume production where board-level assembly infrastructure exists, while OPA211SKGD1 remains optimal for space-constrained hybrid modules requiring maximum thermal dissipation via direct die attach.

Availability

OPA211SKGD1 is available at Aetrix Electronics and suitable for down-hole drilling sensors, high-temperature industrial control, PLL loop filters, and aerospace avionics signal chains requiring stable component supply under extreme thermal stress.

Supply support for OPA211SKGD1 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 high-reliability, high-temperature analog ICs.

The OPA211 series belongs to TI's extreme-temperature op amp product line, engineered specifically for operation in harsh environments such as oilfield down-hole tools, jet engine controls, and space-grade instrumentation where conventional op amps fail.

FAQ

What is the maximum junction temperature specification for OPA211SKGD1?

The OPA211SKGD1 is rated for continuous operation up to 210°C junction temperature, with lifetime derating defined in Figure 1 of the SBOS481D datasheet. At 105°C TJ, the silicon-only design goal is 10 years; actual system-level life depends on package interconnect reliability and thermal management. The device's absolute maximum junction temperature is 210°C, and operation beyond this risks permanent parametric shift or failure.

Does OPA211SKGD1 include shutdown functionality, and how is it controlled?

Yes, OPA211SKGD1 includes a shutdown (enable) pin referenced to the positive supply rail (V+). A valid high (≥ V+ – 0.35 V) disables the amplifier, placing the output in high-impedance state; a valid low (≤ V+ – 3 V) enables normal operation. For example, with ±15 V supplies, enable occurs at ≤12 V and disable at ≥14.65 V on the shutdown pin. This function is fully characterized across –55°C to 210°C and supports precise power sequencing in multi-stage analog systems.

What are the key layout considerations for OPA211SKGD1 in hybrid assembly?

For OPA211SKGD1 bare die assembly, use short, symmetric bond wire runs to –IN and +IN; place 0.1-μF ceramic decoupling capacitors within 1 mm of V+ and V– pads; ground the backside metallization to the most negative potential; and avoid routing noisy digital traces near input nodes. Thermal vias under the die attach area improve heat extraction, and guard rings around inputs reduce leakage at elevated temperatures. TI recommends using gold or aluminum wedge bonding with <25-μm wire diameter.

How does OPA211SKGD1 compare to standard-temperature op amps in noise performance?

OPA211SKGD1 maintains identical low-noise performance as its commercial counterparts: 1.1 nV/√Hz at 1 kHz, 80 nVPP (0.1 Hz to 10 Hz), and 1.7 pA/√Hz current noise - verified across –55°C to 210°C. Unlike many high-temp op amps that trade noise for ruggedness, the OPA211SKGD1 uses SiGe bipolar process enhancements to preserve noise specs while achieving extreme temperature operation, making it uniquely suited for precision analog paths in geothermal or propulsion systems.

Is OPA211SKGD1 suitable for driving ADC inputs, and what settling performance is guaranteed?

Yes, OPA211SKGD1 is explicitly characterized for driving high-precision ADCs: it achieves 700 ns settling to 16-bit accuracy (0.00075%) over 10-V output swings at ±15 V supplies with 100-pF load. This performance is guaranteed across –55°C to 210°C and supports direct interface to 16-bit SAR and sigma-delta ADCs without additional buffering. Input offset voltage (max ±260 μV at 210°C) and drift (0.35 μV/°C typ) ensure DC accuracy remains within LSB tolerance across thermal cycles.