INA233AIDGST

Texas Instruments INA233AIDGST – PMBus/I2C Current, Voltage, and Power Monitor (VSSOP‑10)

The Texas Instruments INA233AIDGST is a precision current, bus‑voltage, and power monitor designed for digital power systems that demand visibility, control, and reliability. Part of TI’s INA233 series, this device integrates a PMBus- and I2C/SMBus‑compatible interface, measures shunt voltage across an external sense resistor, monitors bus voltage up to 36 V, computes power internally, and delivers 16‑bit data with programmable averaging and an alert pin for real‑time system supervision. Supplied in a compact 10‑pin VSSOP (DGS) package and shipped in tape‑and‑reel, the INA233AIDGST is ideal for high‑density boards in servers, telecom, networking, and industrial power systems.

At a Glance

• Brand/Manufacturer: Texas Instruments
• Series: INA233
• MPN: INA233AIDGST
• Category: Power Management ICs > Current, Power & Energy Monitors
• Interface: PMBus, I2C/SMBus‑compatible
• Supply Voltage (Vcc): 2.7 V to 5.5 V
• Bus/Common‑Mode Voltage Range: 0 V to 36 V
• Shunt Voltage Range: ±81.92 mV (typical full‑scale)
• ADC Resolution: 16‑bit
• Measurements: Shunt voltage, bus voltage, current, power
• Averaging/Filtering: Programmable averaging
• Alert/Interrupt: Configurable ALERT pin
• Package/Case: VSSOP‑10 (DGS), MSOP‑10 outline; Tape & Reel (TR)
• Mounting Type: Surface Mount
• Pin Count: 10
• Operating Temperature: −40°C to +125°C
• RoHS/Environmental: RoHS Compliant; lead‑free

How the INA233AIDGST Works

The Texas Instruments INA233AIDGST is built to instrument DC power rails with minimal overhead and high accuracy. The device measures the small differential voltage across an external shunt resistor to determine load current, while simultaneously monitoring the bus (common‑mode) voltage up to 36 V. Using these two measurements, the device computes power internally, delivering 16‑bit digital results that are accessible via PMBus or I2C/SMBus.

A built‑in programmable averaging engine helps smooth transient behavior and reduce noise, enabling stable reporting under dynamic load conditions. System reliability features are supported by a configurable ALERT pin that can signal when user‑defined thresholds are exceeded (for example, overcurrent, over/undervoltage, or power limit events). This makes the INA233AIDGST well‑suited to managed power architectures where the host must respond quickly to faults, derate loads, or log events.

The PMBus compatibility is particularly valuable in server, telecom, and networking platforms where standardized power telemetry and control simplify firmware integration and fleet management. Because the device is also I2C/SMBus‑compatible, it can be adopted easily in embedded systems that do not require the broader PMBus command set.

Key Specifications

• Core function: Current, bus‑voltage, and power monitoring
• Digital interface: PMBus, I2C/SMBus‑compatible
• Supply voltage (Vcc): 2.7 V to 5.5 V
• Bus/common‑mode voltage range: 0 V to 36 V
• Shunt voltage range: ±81.92 mV (typical full‑scale)
• ADC resolution: 16‑bit
• Measurement outputs: Shunt voltage, bus voltage, current, power
• Filtering: Programmable averaging
• Alert/interrupt: Configurable ALERT pin
• Operating temperature range: −40°C to +125°C
• Package: VSSOP‑10 (DGS); Tape & Reel (TR)
• Mounting: Surface Mount; 10 pins
• Environmental compliance: RoHS Compliant; lead‑free

If a parameter is not listed here, it was not specified in the provided datasheet summary.

Design‑In Guidance

Shunt Resistor Selection

• Choose a shunt value that produces measurable shunt voltage within the device’s ±81.92 mV full‑scale range across your expected current window.
• Balance accuracy and power loss: larger shunt values improve measurement resolution but increase I²R losses and thermal rise. Verify resistor power rating across worst‑case current.
• Use low‑TC, precision shunt resistors for stability over temperature, particularly for wide ambient ranges (−40°C to +125°C).

Placement and Layout

• Route the shunt Kelvin connections carefully: use short, symmetric traces to the INA233AIDGST inputs to minimize parasitic error.
• Keep high‑dv/dt switching nodes away from the sense inputs; use a solid ground reference and consider local RC filtering only if consistent with measurement bandwidth needs.
• Place the device close to the shunt to reduce pickup and improve noise immunity.

PMBus/I2C Integration

• The INA233AIDGST supports both PMBus and I2C/SMBus transaction styles. In PMBus‑managed systems, leverage standardized commands for configuration, telemetry, and status.
• Program averaging and conversion timing to match your rail dynamics and telemetry latency requirements.
• Use the ALERT pin to interrupt the host when thresholds are exceeded. Map alerts to system policies (e.g., throttling, fault logging, or shutdown).

Firmware Compatibility Considerations

• While the INA233AIDGST shares a 10‑pin VSSOP footprint with related monitors, its register/command map includes PMBus‑specific features. If you are migrating from non‑PMBus devices, budget time to adapt the firmware.
• When considering alternates such as the INA226AIDGSR, note that although the footprint and general function are similar, the PMBus command set in the INA233AIDGST is not drop‑in firmware compatible. Validate register addresses, scaling, and alert behavior before substitution.

Power Optimization

• The device supports programmable conversion time and averaging to reduce power. Longer conversion times and averaging can lower noise and bus activity at the cost of response time; tune these parameters to your telemetry update rate to balance accuracy and power.

Applications

• Point‑of‑load power monitoring
• Server, telecom, and networking equipment
• Industrial and communications power systems
• Battery and DC power rails monitoring

These applications benefit from the INA233AIDGST’s combination of wide common‑mode range (0–36 V), 16‑bit measurements, PMBus compatibility, and compact VSSOP‑10 package that minimizes PCB area.

Lifecycle, Availability, and Approved Alternates

• Lifecycle Status: Active (per Texas Instruments)
• Availability: Check TI and authorized distributors for current stock and lead times
• Packaging: Tape & Reel (TR) in the VSSOP‑10 (DGS) package

Approved Alternates (verify compatibility):

• INA226AIDGSR — Similar 0–36 V bus current/power monitor in VSSOP‑10 with I2C/SMBus interface. Not software compatible; verify register map, scaling, and firmware before substitution.

Note: Always confirm electrical, firmware/software, and mechanical compatibility before approving alternates for production.

Compliance and Environmental

• RoHS: RoHS Compliant; lead‑free
• Operating Temperature: −40°C to +125°C

If additional environmental, safety, or quality certifications are required (e.g., REACH statements or material declarations), consult TI’s product page or compliance documentation. Items not listed are not specified in the provided datasheet summary.

Why Choose the Texas Instruments INA233AIDGST?

• PMBus‑ready telemetry: Native PMBus compatibility simplifies integration with digital power systems, enabling uniform commands for configuration and monitoring across rails.
• Wide operating range: 0–36 V common‑mode range supports a broad spectrum of DC buses without additional attenuation.
• Precision and flexibility: 16‑bit measurements with programmable averaging deliver stable, high‑resolution data you can tailor to system dynamics.
• Compact, production‑friendly package: The 10‑pin VSSOP (DGS) reduces footprint while the Tape & Reel format streamlines automated assembly.
• Industrial temperature support: −40°C to +125°C makes the device suitable for a wide range of environments.

These strengths reduce integration time, improve system visibility, and enable proactive fault handling—key advantages for engineers designing scalable, managed power platforms.

Ordering Information and Part Details

• Manufacturer: Texas Instruments
• Part Number: INA233AIDGST
• Series: INA233
• Package: VSSOP‑10 (DGS), MSOP‑10 outline; Tape & Reel (TR)
• Mounting: Surface Mount
• Pin Count: 10
• Interface: PMBus, I2C/SMBus‑compatible
• Supply: 2.7 V to 5.5 V
• Bus/Common‑Mode Voltage: 0 V to 36 V
• ADC: 16‑bit; programmable averaging
• Alert: Configurable ALERT pin

For pricing and bulk availability, contact TI sales or authorized distribution. Pricing varies by distributor and order quantity.

Practical Implementation Tips

• Calibrate once, verify often: After selecting your shunt and configuring conversion timing/averaging, validate measurement accuracy against a trusted reference across temperature and load conditions.
• Use alerts for guardrails: Implement current, voltage, and power limit alerts to protect expensive loads and ensure deterministic fault handling.
• Document scaling in firmware: Record conversion factors (for current and power) within your codebase to prevent regression errors during firmware updates or board revisions.
• Plan for serviceability: Expose debug registers via PMBus/I2C to aid field diagnostics and fleet monitoring.

Frequently Asked Questions (FAQs)

Q: Is INA233 pin‑compatible with INA226?
A: They share the same 10‑pin VSSOP footprint and general functions, but INA233 adds a PMBus‑compatible command set. Hardware footprint may be compatible, but the register/command map differs; firmware is not drop‑in compatible.

Q: What bus voltage can the INA233AIDGST measure?
A: The device supports measuring bus voltage with a common‑mode range from 0 V to 36 V.

Q: What supply voltage does the INA233AIDGST require?
A: The device operates from a 2.7 V to 5.5 V supply.

Q: Is the INA233AIDGST RoHS compliant?
A: Yes, it is RoHS Compliant and lead‑free.

Q: What is the operating temperature range?
A: −40°C to +125°C, suitable for industrial environments.

Q: Does the INA233AIDGST support averaging and alerts?
A: Yes. It provides programmable averaging and a configurable ALERT pin for threshold‑based interrupts.

Resources

• Product Page: https://www.ti.com/product/INA233
• Datasheet: https://www.ti.com/lit/ds/symlink/ina233.pdf

If a characteristic you need is not listed above, consult the official Texas Instruments datasheet and product page for the most current, detailed specifications and application guidance.