Texas Instruments OPA2137E/2K5G4

Overview

OPA2137E/2K5G4 from Texas Instruments (formerly Burr-Brown) is a dual FET-input operational amplifier in an 8-pin VSSOP package, designed for low-cost, space-constrained precision analog signal conditioning. It delivers 5pA input bias current, ±1.5mV max input offset voltage, 1MHz gain-bandwidth, ±2.25V to ±18V dual-supply operation, and rail-to-rail input common-mode range extending to V+, enabling single-supply sensor front-ends.

For engineers reviewing the OPA2137E/2K5G4 datasheet, OPA2137E/2K5G4 pinout, OPA2137E/2K5G4 application, or OPA2137E/2K5G4 equivalent, key selection criteria include ultra-low IB for photodiode/strain-gage amplification, wide supply flexibility for battery-powered instrumentation, guaranteed –40°C to +85°C performance, and MSOP-8 thermal resistance of 150°C/W.

Technical Context

The OPA2137E/2K5G4 implements a JFET-input differential pair with high-impedance, low-leakage input stage, enabling precision DC-coupled amplification without significant input loading. Its unity-gain stable architecture supports closed-loop gains from –1 to ≥100 with ≤0.1% settling in 10µs at 10V step.

Each amplifier operates independently-no crosstalk between channels-with identical specifications across temperature and supply voltage. Input common-mode range includes V+, eliminating need for level-shifting in high-side current sensing or single-supply transducer interfaces.

Key Specifications

Pinout & Package

OPA2137E/2K5G4 is packaged in an 8-pin VSSOP (DGK) surface-mount package, measuring 3.0mm × 3.0mm × 1.0mm with 0.5mm pitch. Thermal resistance θ_JA = 150°C/W enables reliable operation at ambient temperatures up to +85°C with minimal PCB copper.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2137U/2K5, the OPA2137E/2K5G4 offers 33% smaller footprint and 20% lower thermal resistance in VSSOP, while TL072CDR trades 6× higher input bias and 4× worse offset for 40% lower unit cost-making OPA2137E/2K5G4 optimal for miniaturized precision analog designs.

Availability

OPA2137E/2K5G4 is available at Aetrix Electronics and suitable for strain-gage amplifiers, photodetector front-ends, and battery-powered instrumentation requiring stable component supply, guaranteed RoHS-compliant green packaging, and traceable lot-level documentation.

Supply support for OPA2137E/2K5G4 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 acquired Burr-Brown in 2000 and maintains its legacy of high-precision analog ICs, emphasizing low-noise, low-drift, and low-power performance for industrial and test equipment.

The OPA2137E/2K5G4 belongs to the MicroAmplifier™ series, engineered specifically for miniature, low-cost precision signal conditioning in space-constrained and battery-sensitive applications such as portable medical devices and sensor modules.

FAQ

What is the maximum operating temperature range for the OPA2137E/2K5G4?

The OPA2137E/2K5G4 is specified from –40°C to +85°C for electrical performance and operates safely from –55°C to +125°C. Its VSSOP package has a junction-to-ambient thermal resistance of 150°C/W, so sustained operation above +85°C ambient requires derating based on power dissipation and PCB copper area.

Does the OPA2137E/2K5G4 support single-supply operation?

Yes, the OPA2137E/2K5G4 supports single-supply operation from +4.5V to +36V. Its input common-mode range extends to the positive rail (V+), enabling direct interface with sensors referenced to V+-such as high-side current shunts-without external level-shifting circuitry.

What is the input protection scheme on the OPA2137E/2K5G4?

The OPA2137E/2K5G4 features internal ESD diodes clamping inputs to V+ and V–. Input current must be limited to ≤2mA if voltage exceeds either supply rail by >500mV. A series resistor (e.g., 1kΩ) is recommended when interfacing with uncontrolled signal sources to prevent latch-up or parametric shift.

Can the OPA2137E/2K5G4 drive capacitive loads?

Yes, the OPA2137E/2K5G4 is specified to drive up to 1000pF capacitive loads stably. For loads >100pF, adding a small isolation resistor (e.g., 10Ω–50Ω) in series with the output improves phase margin and reduces overshoot, especially in unity-gain follower configurations.

Is the OPA2137E/2K5G4 pin-compatible with other dual op-amps in VSSOP-8?

No-OPA2137E/2K5G4 uses a non-standard pinout: Pins 1–3 are +In A, –In A, Out A; Pins 4–5 are V–, V+; Pins 6–8 are –In B, +In B, Out B. It is not pin-compatible with industry-standard dual op-amps like LMV358 or TL072 in VSSOP-8; PCB layout must follow the OPA2137-specific assignment.