Texas Instruments INA215BIRSWT

Overview

INA215BIRSWT from Texas Instruments is a voltage-output, bidirectional current-shunt monitor with zero-drift architecture, designed for high-accuracy low- or high-side current sensing in power rails up to 26 V. It features a fixed gain of 75 V/V, ±60 µV maximum input offset voltage (RTI), 0.5 µV/°C max offset drift, 10 ppm/°C max gain drift, and operates from 2.7 V to 26 V supply with ≤100 µA quiescent current. It enables precise measurement of shunt voltage drops as low as 10 mV full-scale in battery chargers and telecom power management systems.

For engineers reviewing the INA215BIRSWT datasheet, INA215BIRSWT pinout, INA215BIRSWT application, or INA215BIRSWT equivalent, this page delivers verified technical context, package-specific pin functions, real-world use-value metrics, and validated alternative options - all grounded in TI's SBOS437K production data sheet and official RSW package documentation.

Technical Context

The INA215BIRSWT implements a zero-drift chopper-stabilized amplifier topology to achieve ultra-low offset and drift, supporting accurate bidirectional current sensing across –0.1 V to 26 V common-mode range. Its differential input stage rejects common-mode noise with ≥105 dB CMRR over –40°C to +125°C, while the 75 V/V fixed gain is internally set by laser-trimmed resistors (R_INT = 13.3 kΩ).

It uses a single-supply architecture with rail-to-rail output swing (within 50 mV of V+ and 5 mV of GND at 10 kΩ load) and integrates no shutdown pin - power cycling is implemented externally. The REF pin accepts 0 V to V_S reference voltage, enabling offset-adjusted output scaling, and requires low-impedance drive to preserve CMRR.

Key Specifications

Pinout & Package

INA215BIRSWT is packaged in a 10-pin Thin UQFN (RSW) with 0.4 mm pitch, body size 1.80 mm × 1.40 mm, wettable flank terminations, and thermal pad for enhanced PCB heat dissipation (R_θJB = 18.7 °C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current-sense amplifier applications.

Compared with INA214BIRSWT and INA226AIRSAT, the INA215BIRSWT offers optimal balance of low offset (±60 µV), moderate gain (75 V/V), and analog simplicity - making it ideal for cost-sensitive, space-constrained designs requiring analog feedback with minimal external components and no software overhead.

Availability

INA215BIRSWT is available at Aetrix Electronics and suitable for battery management systems, telecom power supplies, server PSUs, and industrial motor drives requiring stable component supply, consistent parametric performance, and long-term lifecycle support.

Supply support for INA215BIRSWT 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, embedded processing, and power management ICs, with decades of expertise in precision signal conditioning and high-reliability industrial solutions.

The INA21x series was engineered specifically for high-accuracy, low-power current sensing in space- and thermal-constrained applications - targeting battery-powered devices, telecom infrastructure, and industrial power systems where shunt-based measurement fidelity is critical.

FAQ

What is the maximum common-mode voltage supported by the INA215BIRSWT?

The INA215BIRSWT supports a common-mode input voltage range of –0.1 V to 26 V across its full operating temperature range (–40°C to +125°C). This specification applies to Versions B and C of the INA21x family, and the INA215BIRSWT is a Version B device per TI's SBOS437K datasheet. It enables reliable high-side sensing on 24 V industrial rails while powered from a lower-voltage supply such as 3.3 V or 5 V.

Does the INA215BIRSWT have a shutdown pin, and how is power managed?

The INA215BIRSWT does not include a dedicated shutdown pin. Power management is implemented externally by switching the V+ supply rail using a logic-level MOSFET or transistor. In shutdown mode, input leakage paths remain (~1 MΩ from IN+ and IN– to OUT and REF), so system-level design must account for residual current flow - especially when REF is grounded or biased. TI recommends grounding REF during shutdown to minimize error current through the shunt.

What is the purpose of the REF pin on the INA215BIRSWT, and how should it be used?

The REF pin on the INA215BIRSWT sets the output voltage offset: V_OUT = 75 × (V_IN+ – V_IN–) + V_REF. It accepts any DC voltage from 0 V to V_S, enabling flexible output scaling - e.g., tying REF to 1.65 V yields a 0–3.3 V output for direct connection to a 3.3 V ADC. To preserve CMRR, REF must be driven from a source impedance ≤1 kΩ; resistive dividers require buffering with an op amp.

Can the INA215BIRSWT be used for bidirectional current sensing, and what design considerations apply?

Yes, the INA215BIRSWT supports true bidirectional current sensing because its input stage operates down to –0.1 V common-mode and its output swings to within 5 mV of GND. For bidirectional use, configure the shunt between load and ground (low-side) or between supply and load (high-side), and set REF to mid-supply (e.g., 1.65 V for 3.3 V system) so positive current yields V_OUT > V_REF and negative current yields V_OUT < V_REF. Ensure PCB layout symmetry on IN+ and IN– traces to minimize thermal EMF errors.

What is the typical bandwidth and slew rate of the INA215BIRSWT, and how do they affect system response?

The INA215BIRSWT has a small-signal bandwidth of 40 kHz (with 10 pF load) and a slew rate of 0.4 V/µs. These values enable accurate capture of current transients up to ~10 kHz - sufficient for most power supply loop control, overcurrent fault detection, and battery charge/discharge profiling. For faster events (e.g., short-circuit spikes), the 40 kHz bandwidth may filter high-frequency content, but the 0.4 V/µs slew rate ensures monotonic step response without ringing when driving capacitive loads ≤1 nF.