Analog Devices Inc./Maxim Integrated MAX16135HRB+T

Overview

MAX16135HRB+T from Analog Devices is a quad-input, automotive-grade precision voltage supervisor IC that monitors four independent supply rails (IN1–IN4) for undervoltage and overvoltage window faults with ±1% threshold accuracy over -40°C to +125°C. It features dual active-low open-drain reset outputs (RESET1, RESET2), 23 factory-programmable reset timeout periods (e.g., 560ms for suffix T), and operates from 1.71V to 5.5V VDD. It is designed for functional safety-critical ADAS systems requiring reliable multi-rail power integrity monitoring.

For engineers reviewing the MAX16135HRB+T datasheet, MAX16135HRB+T pinout, MAX16135HRB+T application, or MAX16135HRB+T equivalent, this page delivers verified technical context, exact pin functions, real-world ADAS and server use cases, and two validated alternative supervisors - all grounded in the official MAX16132–MAX16135 datasheet Rev 26 (10/24).

Technical Context

The MAX16135HRB+T implements a quad-input window supervision architecture where RESET1 asserts when either IN1 or IN2 falls outside its factory-trimmed UV/OV thresholds, and RESET2 asserts when either IN3 or IN4 violates its thresholds. All inputs support programmable nominal voltages (1.0V–5.0V) and tolerance windows (±4% to ±11%), with hysteresis options of 0.25% or 0.50% of VIN_NOM.

It uses internal precision voltage references and comparator-based detection with guaranteed correct reset logic state down to VDD = 1.07V. The device shares one factory-set reset timeout period across both outputs and is immune to short monitored-supply transients due to built-in filtering and hysteresis design.

Key Specifications

Pinout & Package

MAX16135HRB+T is housed in an 8-pin SOT23 package (outline 21-0078, land pattern 90-0176) with thermal resistance θ_JA = 196°C/W on a four-layer board. Pin 1 is VDD; pins 2–3 are IN4 and IN3; pins 5–6 are IN1 and IN2; pin 4 is GND; pin 7 is RESET2; pin 8 is RESET1. All reset outputs are active-low, open-drain, and require external pull-up resistors.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with MAX16135HRB+T, MAX16134HRA+T provides finer per-rail control but lacks the dual-grouped reset architecture needed for coordinated subsystem recovery, while TPS3808G33DBVR offers lower cost and smaller size but cannot replace quad-window supervision in ADAS or multivoltage ASIC applications.

Availability

MAX16135HRB+T is available at Aetrix Electronics and suitable for automotive ADAS ECUs, multivoltage ASIC power sequencing, industrial server management, and storage controller power integrity applications requiring stable component supply and AEC-Q100 compliance.

Supply support for MAX16135HRB+T 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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and consumer markets with precision signal chain solutions.

The MAX16132–MAX16135 product line was engineered specifically for automotive and industrial systems demanding high-accuracy, multi-rail power supervision with functional safety support - targeting ADAS, server BMCs, and storage controllers.

FAQ

What is the function of the dual reset outputs in MAX16135HRB+T?

The MAX16135HRB+T features two active-low open-drain reset outputs: RESET1 asserts when either IN1 or IN2 falls outside its programmed UV/OV window, and RESET2 asserts when either IN3 or IN4 violates its window. This grouped architecture enables coordinated subsystem reset - for example, resetting logic and I/O domains independently - without requiring external logic. Both outputs share the same factory-programmed timeout (560ms for suffix T) and require external pull-up resistors to VDD.

How does the ±1% threshold accuracy of MAX16135HRB+T benefit automotive designs?

The ±1% threshold accuracy of MAX16135HRB+T over -40°C to +125°C eliminates the need for system-level calibration or margining in automotive ADAS ECUs. This ensures deterministic fault detection across extreme ambient conditions - for instance, maintaining precise 1.2V ±4.8% window supervision during engine bay operation - directly supporting ISO 26262 functional safety goals by reducing uncertainty in power-good validation.

Can MAX16135HRB+T monitor different nominal voltages on each input?

Yes - MAX16135HRB+T supports independent factory-programmable nominal input voltages from 1.0V to 5.0V per input (IN1–IN4), as defined by its ordering suffix 'HRB'. For HRB, the nominal voltages are 3.3V (IN1), 1.8V (IN2), 1.2V (IN3), and 1.0V (IN4). Each input also has independently programmable tolerance (±4% to ±11%) and hysteresis (0.25% or 0.50%), enabling precise window supervision tailored to each rail's regulation spec.

What is the significance of the 'T' suffix in MAX16135HRB+T?

The 'T' suffix in MAX16135HRB+T specifies the factory-programmed minimum reset timeout period of 560ms, as defined in Table 9 of the datasheet. This timeout determines how long RESET1 and RESET2 remain asserted after their respective input voltage windows are restored. The 560ms value is selected to exceed typical microprocessor and FPGA boot initialization times, ensuring stable execution before release - critical for automotive and server applications where premature release causes lockup or data corruption.

Is MAX16135HRB+T AEC-Q100 qualified, and what grade does it meet?

Yes, MAX16135HRB+T is AEC-Q100 qualified and meets Grade 0 specifications (operating temperature range -40°C to +125°C junction temperature). This qualification includes stress testing for accelerated environmental, mechanical, and electrical reliability - confirming suitability for under-hood automotive applications such as radar, camera, and domain controller ECUs where long-term robustness and zero-defect operation are mandatory.