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Texas Instruments INA4235AIYBJR
- Part No.:
- INA4235AIYBJR
- Manufacturer:
- Texas Instruments
- Category:
- Power Supply Controllers, Monitors
- Package:
- 16-XFBGA, DSBGA
- Datasheet:
-
INA4235AIYBJR.pdf
- Description:
- QUAD CHANNEL, 16-BIT, ULTRA-PREC
- Quantity:
- Payment:
- Shipping:
Inventory:1,418
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Product details
Overview
INA4235AIYBJR from Texas Instruments is a quad-channel, 16-bit ultra-precise current/voltage/power/energy monitor IC with I²C/SMBus interface, supporting –0.3V to 48V common-mode input, 0.1% gain error (max), and 10µV offset (max). It enables real-time multichannel power telemetry in compact server power rails and battery management systems.
For engineers reviewing the INA4235AIYBJR datasheet, INA4235AIYBJR pinout, INA4235AIYBJR application, or INA4235AIYBJR equivalent, this page delivers verified technical context, exact pin functions, calibrated accuracy specs, DSBGA-16 package details, and two validated alternative parts for multi-rail monitoring designs requiring sub-mA current resolution and 48V bus compatibility.
Technical Context
The INA4235AIYBJR integrates a low-offset 16-bit delta-sigma ADC shared across four independent channels, performing sequential shunt voltage (differential IN+/IN–) and bus voltage (referenced to IN–) measurements. Each channel supports programmable full-scale ranges (20mV/80mV), configurable averaging, and independent calibration registers enabling direct readouts in amperes, watts, and joules.
Its internal measurement engine executes round-robin conversions per channel, updating current, power, and energy registers independently after averaging completion. Alert logic operates on raw conversion results-not averaged values-enabling immediate overcurrent/overvoltage detection with configurable thresholds via dedicated alert registers and open-drain ALERT output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 4 independent current/voltage/power/energy sensing channels |
| ADC Resolution | 16-bit delta-sigma with 2.5µV LSB (ADCRANGE=0) for high-precision shunt sensing |
| Common-Mode Range | –0.3V to 48V - enables direct monitoring of 48V bus rails without level-shifting |
| Current Accuracy | 0.1% max gain error + 10µV max offset - ensures ±0.1% full-scale current error at light loads |
| Power Accuracy | 0.2% full-scale max - supports accurate watt-hour accumulation in energy metering |
| Interface | I²C/SMBus, 1.2V–5.5V compatible, up to 2.94 MHz (high-speed mode) |
| Supply Range | 1.7V to 5.5V - interoperable with 1.8V/3.3V/5V system rails |
Pinout & Package
INA4235AIYBJR is housed in a 1.5mm × 1.5mm DSBGA-16 package (YBJ), optimized for space-constrained PCB layouts in multi-rail power systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+1 to IN+4 | Channel 1–4 shunt voltage positive inputs | Differential inputs for sense resistor high-side connection; support bidirectional current sensing |
| IN−1 to IN−4 | Channel 1–4 shunt voltage negative inputs / bus voltage reference | Reference node for both shunt differential measurement and bus voltage sensing (–0.3V to 48V range) |
| VS | Analog/digital supply input | 1.7V–5.5V single supply powering all circuitry; independent of bus common-mode voltage |
| GND | Analog/digital ground | Common return for VS and digital I/O; must be connected to system ground plane |
| SCL / SDA | I²C clock/data bidirectional lines | Open-drain, 1.2V–5.5V tolerant; support standard/fast/high-speed I²C modes |
| A0 / A1 | I²C address configuration inputs | Select one of 16 unique addresses by tying to GND, VS, SCL, or SDA |
| ALERT | Configurable open-drain alert output | Signals over/under-current, over/under-voltage, power overlimit, or conversion-ready events |
| EN | Enable control input | Logic-high enables operation (400µA typical IQ); logic-low disables to <50nA quiescent current |
Key Features
| Feature | Design Value |
|---|---|
| Quad-channel synchronized monitoring | Simultaneous reporting of current, voltage, power, and energy per channel with shared ADC resource |
| Programmable full-scale shunt range | 20mV or 80mV selection - optimizes resolution for low-current (sub-mA) or high-current (10s of A) applications |
| Low input bias current | <5nA max - enables use of large-value sense resistors and external RC filters without accuracy degradation |
| Independent bus voltage sensing | Measures VIN− vs GND with 1.6mV LSB - provides rail voltage telemetry without additional components |
| Configurable alert architecture | Four alert registers assignable to any channel; five alert types (SOL/SUL/BOL/BUL/POL) with threshold programming |
Applications
| Server Power Rail Monitoring | Battery Cell Balancing |
|---|---|
|
Use Scenario: Real-time current, voltage, and power tracking across 48V intermediate bus and CPU/GPU VRM outputs in rack servers. IC Role / Device Role / Timing Role: Quad-channel precision monitor providing per-rail telemetry to BMC/IPMI via I²C for dynamic power capping and thermal management. Use Value: Enables compliance with ENERGY STAR® and Climate Pledge requirements through accurate joule-level energy accounting per rail. |
Use Scenario: Simultaneous monitoring of individual cell voltages and charge/discharge currents in 12S Li-ion battery packs. IC Role / Device Role / Timing Role: Current/voltage sensor feeding BMS controller with calibrated amperes and volts per cell, supporting active balancing decisions. Use Value: 10µV offset and 0.1% gain error ensure ≤0.5% SoC error over lifetime, extending pack service life and safety margin. |
| Industrial Retail Automation | Security Camera Power Management |
|
Use Scenario: Power telemetry for POS terminals, kiosks, and automated checkout systems with mixed 5V/12V/24V rails. IC Role / Device Role / Timing Role: Multirail monitor detecting overcurrent faults and logging energy consumption per subsystem for predictive maintenance. Use Value: ALERT pin triggers immediate shutdown on short-circuit events, preventing damage to embedded controllers and displays. |
Use Scenario: 48V PoE++ powered security cameras requiring precise load current profiling and overload protection. IC Role / Device Role / Timing Role: Four-channel monitor measuring camera core, IR illuminator, image sensor, and PoE interface currents independently. Use Value: Configurable averaging and 16-bit resolution detect microamp-level leakage currents indicating early-stage component degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel current/voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA4230AIRGTR | Single-channel, same 16-bit ADC, identical accuracy specs, but no energy accumulation or quad-channel capability | Requires four separate devices and I²C address management for equivalent channel count; higher board area and BOM cost | Choose when only one rail requires monitoring or when design flexibility demands discrete channel placement |
| MAX40080GTP+ | Quad-channel, 16-bit, but limited to 36V common-mode and lacks integrated energy calculation; uses SPI instead of I²C | Not suitable for 48V systems; requires host MCU with SPI peripheral and custom firmware for energy integration | Consider only if existing platform lacks I²C resources or operates strictly below 36V bus voltage |
Compared with INA4235AIYBJR, the INA4230AIRGTR offers identical per-channel precision but scales poorly for multi-rail systems due to discrete implementation, while the MAX40080GTP+ sacrifices 48V compatibility and autonomous energy computation-making INA4235AIYBJR the sole solution meeting all four requirements: quad-channel, 48V CM, I²C interface, and integrated joule accumulation.
Availability
INA4235AIYBJR is available at Aetrix Electronics and suitable for rack server power telemetry, battery cell balancers, industrial retail automation, and PoE++ security camera designs requiring stable component supply and long-term production continuity.
Supply support for INA4235AIYBJR 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 and embedded processing technologies, with decades of expertise in precision sensing and power management ICs.
The INA4235AIYBJR belongs to TI's high-accuracy current-sense monitor product line, designed specifically for multichannel energy-aware systems where simultaneous current, voltage, power, and energy telemetry are required without external computation.
FAQ
What is the maximum common-mode voltage supported by the INA4235AIYBJR?
The INA4235AIYBJR supports a common-mode input range of –0.3V to 48V, enabling direct monitoring of 48V intermediate bus rails without external level-shifting circuitry. This specification is guaranteed across the full operating temperature range (–40°C to +125°C) and is independent of the 1.7V–5.5V supply voltage applied to the VS pin.
Does the INA4235AIYBJR provide true energy (joule) accumulation, or is it derived externally?
The INA4235AIYBJR performs autonomous energy accumulation internally using its integrated calculation engine. Energy is computed as the sum of power × timebase intervals and stored in dedicated energy registers - no host MCU computation is required. The device achieves ±0.7% full-scale energy accuracy, validated across temperature and common-mode voltage variations.
How many unique I²C addresses does the INA4235AIYBJR support, and how are they configured?
The INA4235AIYBJR supports 16 unique I²C addresses via two binary address pins (A0 and A1), each configurable to GND, VS, SCL, or SDA. This allows up to 16 devices on a single I²C bus without address conflict - essential for dense multi-rail monitoring in servers or battery packs where multiple INA4235AIYBJR units may coexist.
Can the INA4235AIYBJR operate in low-power modes, and what are the current draw specifications?
Yes, the INA4235AIYBJR offers three power states: normal operation (400µA typical IQ), standby mode (2.5µA typical), and fully disabled state (<50nA) via the EN pin. All modes retain register contents and I²C address configuration, enabling rapid wake-up and seamless resumption of monitoring without reinitialization.
What is the role of the ALERT pin on the INA4235AIYBJR, and how many alert conditions can it signal simultaneously?
The ALERT pin on the INA4235AIYBJR is a multifunctional open-drain output that can signal up to four concurrent alert conditions - including shunt over/under-limit, bus over/under-limit, and power over-limit - based on user-programmed thresholds in dedicated alert registers. It also supports conversion-ready indication, eliminating polling overhead in time-critical applications.
INA4235AIYBJR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-XFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- Applications:
- Digital Power Monitor
- Voltage - Input:
- -
- Voltage - Supply:
- 1.7V ~ 5.5V
- Current - Supply:
- 400 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DSBGA (0.71x1.47)
INA4235AIYBJR FAQ
1.How can I place an order for INA4235AIYBJR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA4235AIYBJR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for INA4235AIYBJR reliable?
The price and inventory of INA4235AIYBJR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA4235AIYBJR is usually 5 days.
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4.How is shipping managed for INA4235AIYBJR?
INA4235AIYBJR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA4235AIYBJR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for INA4235AIYBJR?
For technical support, including INA4235AIYBJR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA4235AIYBJR requirements.
6.How does Aetrix verify that INA4235AIYBJR is sourced from the original manufacturer or authorized distributors?
All INA4235AIYBJR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that INA4235AIYBJR meets industry standards.
7.What is the process for return or replacement of INA4235AIYBJR?
All INA4235AIYBJR units undergo pre-shipment inspection (PSI). If there is an issue with INA4235AIYBJR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The INA4235AIYBJR part is unused and in its original packaging.
Return procedure for INA4235AIYBJR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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