Texas Instruments INA280A5IDCKT

Overview

INA280A5IDCKT from Texas Instruments is a high-side unidirectional current sense amplifier with 500 V/V fixed gain, 2.7–120 V common-mode input range, ±150 µV max offset voltage, ±0.5% max gain error, and 1.1-MHz bandwidth at lower gains (800 kHz at A5). It operates from a 2.7–20-V single supply and draws 370 µA quiescent current, enabling precision DC and fast transient current monitoring in 48-V server power rails.

For engineers reviewing the INA280A5IDCKT datasheet, INA280A5IDCKT pinout, INA280A5IDCKT application, or INA280A5IDCKT equivalent, this page delivers verified specifications, SC-70 package layout, real-world use cases in macro RRU and rack server power systems, and two validated alternative parts with documented technical and application differences.

Technical Context

The INA280A5IDCKT uses a transconductance architecture with current-feedback amplifier topology to achieve low input bias current (20 µA typ) and high common-mode rejection (120 dB DC min, 85 dB AC at 50 kHz), while maintaining operation up to 120 V common-mode voltage. Its unidirectional sensing design restricts use to high-side configurations where current flows from supply to load.

Gain is set by an internal precision resistor network (2 kΩ/1000 kΩ for A5 variant); external gain adjustment is not recommended due to resistor tolerance variation. Bandwidth is gain-dependent: 800 kHz at A5 (500 V/V) with 8 mV differential input, supporting fast overcurrent detection with <2 µs response on 2-mΩ shunts at 75-A threshold.

Key Specifications

Pinout & Package

INA280A5IDCKT is housed in a 5-pin SC-70 (DCK) package with 2.00 mm × 1.25 mm body size and 0.65-mm lead pitch. The compact footprint supports high-density PCB layouts in space-constrained macro RRU and server VRM modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA280A5IDCKT, INA293A5IDBVR offers higher AC CMRR and bandwidth for demanding industrial environments, while MAX40056ASA+T provides superior offset and speed in low-voltage portable systems-neither is pin-compatible, and both require layout revision due to differing supply and common-mode constraints.

Availability

INA280A5IDCKT is available at Aetrix Electronics and suitable for macro remote radio unit (RRU), 48-V rack server power supply, active antenna system (AAS), test and measurement equipment, and high-side DC power monitoring applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for INA280A5IDCKT 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets since 1930.

The INA280 product line targets high-accuracy, high-bandwidth current sensing in space-constrained, high-voltage power systems-including telecom infrastructure, server VRMs, and RF power control-where low offset, wide CM range, and SC-70 packaging are critical.

FAQ

What is the maximum common-mode voltage the INA280A5IDCKT can withstand?

The INA280A5IDCKT has an operational common-mode input range of 2.7 V to 120 V and a survival rating of −20 V to +122 V. This allows direct connection to 48-V and 54-V telecom rails without external level-shifting circuitry. Operation below 2.7 V is restricted by supply voltage per Figure 7-1 in the datasheet, and sustained exposure above 122 V may cause permanent damage.

Does the INA280A5IDCKT support bidirectional current sensing?

No, the INA280A5IDCKT is strictly unidirectional and designed for high-side current sensing only. Its internal architecture limits operation to current flow from supply to load. It cannot measure reverse or sinking current; attempting to do so results in output saturation or invalid readings. For bidirectional applications, consider TI's INA229 or similar devices explicitly specified for dual-direction operation.

What is the bandwidth of the INA280A5IDCKT at its 500 V/V gain setting?

The INA280A5IDCKT has a small-signal −3-dB bandwidth of 800 kHz when configured for 500 V/V gain, measured with C_LOAD = 5 pF and V_SENSE = 8 mV. Bandwidth decreases with higher capacitive loading or lower differential input amplitude. This performance enables sub-2-µs overcurrent response on 2-mΩ shunts at 75-A thresholds, as confirmed in Table 7-2 of the datasheet.

Can the gain of the INA280A5IDCKT be modified externally?

No, the gain of the INA280A5IDCKT is fixed at 500 V/V by an internal precision resistor network (2 kΩ/1000 kΩ). Texas Instruments explicitly advises against adding external resistors to modify gain, as absolute resistor values vary significantly between units, causing unpredictable gain errors. System-level gain adjustment must be performed downstream (e.g., in ADC firmware or external op-amp stages).

What package type and dimensions does the INA280A5IDCKT use?

The INA280A5IDCKT uses the SC-70 (DCK) package: a 5-pin surface-mount outline with nominal body dimensions of 2.00 mm × 1.25 mm and 0.65-mm lead pitch. Its PCB footprint occupies only 2.0 mm × 2.1 mm, making it suitable for dense RF front-end and server VRM layouts where board space is constrained.