Analog Devices Inc./Maxim Integrated MAX16135HRB/V+

Overview

MAX16135HRB/V+ from Analog Devices is a quad-input, automotive-grade 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., 1ms min), and operates from 1.71V to 5.5V VDD - designed specifically for functional safety-critical ADAS power monitoring.

For engineers reviewing the MAX16135HRB/V+ datasheet, MAX16135HRB/V+ pinout, MAX16135HRB/V+ application, or MAX16135HRB/V+ equivalent, this device delivers precise quad-rail supervision with dual fault-grouped reset logic, AEC-Q100 qualification, and guaranteed reset-state integrity down to VDD = 1.07V - critical for automotive ECU and domain controller power sequencing validation.

Technical Context

The MAX16135HRB/V+ implements a quad-input window comparator architecture where RESET1 asserts if IN1 or IN2 falls outside its factory-trimmed UV/OV thresholds, and RESET2 asserts if IN3 or IN4 falls outside its thresholds. All inputs support programmable nominal voltages (1.0V–5.0V) and tolerance windows (±4% to ±11%), with ±1% total threshold accuracy over temperature and 0.25%/0.50% hysteresis options.

Its internal reference and trimming circuitry enable simultaneous high-precision monitoring of heterogeneous supply domains (e.g., 5.0V, 3.3V, 1.8V, 1.2V), while the shared factory-set reset timeout period ensures synchronized recovery timing across both reset outputs - essential for ISO 26262-compliant system-level fault response coordination.

Key Specifications

Pinout & Package

MAX16135HRB/V+ is housed in an 8-pin SOT23 package (package code K8+5A, outline 21-0078), optimized for space-constrained automotive PCB layouts and compatible with standard reflow profiles (260°C peak).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX16135HRB+T, the /V+ variant adds verified lead-free finish and enhanced traceability; compared with TLV809E33DBVR, MAX16135HRB/V+ provides full quad-rail window supervision with fault-grouped dual resets - a non-substitutable requirement for automotive functional safety architectures.

Availability

MAX16135HRB/V+ is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, multivoltage ASIC power sequencing, and industrial edge AI gateways requiring stable component supply with AEC-Q100 assurance and long-term lifecycle support.

Supply support for MAX16135HRB/V+ 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 technologies, serving automotive, industrial, communications, and healthcare markets with precision power management and sensing solutions.

The MAX16132–MAX16135 family was engineered specifically for automotive functional safety applications - delivering high-accuracy, multi-rail voltage supervision with AEC-Q100 qualification and integrated fault-grouping logic to simplify ISO 26262-compliant system design.

FAQ

What is the function of the /V+ suffix in MAX16135HRB/V+?

The /V+ suffix indicates a lead-free, RoHS-compliant finish with NiPdAu plating and enhanced moisture sensitivity level (MSL) rating, validated per JEDEC J-STD-020. MAX16135HRB/V+ maintains identical electrical performance and pinout as non-/V variants, but offers improved solderability and reliability for automotive reflow processes - critical for MAX16135HRB/V+ deployment in high-reliability vehicle ECUs.

How does MAX16135HRB/V+ handle fault grouping between its four inputs?

MAX16135HRB/V+ groups inputs into two independent fault domains: RESET1 asserts if either IN1 or IN2 violates its UV/OV window, and RESET2 asserts if either IN3 or IN4 violates its window. This dual-group architecture enables selective system partitioning - for example, using RESET1 to hold application processors in reset while allowing communication peripherals (monitored on IN3/IN4) to remain active - a key capability for MAX16135HRB/V+ in modular ADAS designs.

What is the minimum VDD voltage at which MAX16135HRB/V+ guarantees correct reset output logic state?

MAX16135HRB/V+ guarantees correct active-low reset output logic state (i.e., valid high-impedance or pulled-low behavior) down to VDD = 1.07V. This specification ensures deterministic reset signaling during brownout conditions common in automotive stop-start systems - a critical reliability feature distinguishing MAX16135HRB/V+ from general-purpose supervisors that may float or oscillate below 1.5V.

Can unused inputs on MAX16135HRB/V+ be left floating?

No - unused inputs on MAX16135HRB/V+ must be connected to their nominal voltage setting (e.g., via a resistor divider or direct tie to a stable rail), as specified in the Applications Information section. Floating inputs risk false triggering due to noise coupling, compromising the ±1% threshold accuracy and functional safety integrity of MAX16135HRB/V+. This requirement applies strictly to all four INx pins regardless of supervision channel usage.

Does MAX16135HRB/V+ support overvoltage detection on all four inputs?

Yes - MAX16135HRB/V+ performs full window monitoring (both undervoltage and overvoltage detection) on all four inputs (IN1–IN4). Each input's UV and OV thresholds are calculated as VIN_NOM × (1 ± TOL%), with TOL programmable from ±4% to ±11%. This dual-fault detection capability is fundamental to MAX16135HRB/V+'s role in protecting against regulator failure, load dump, or reverse-battery conditions in automotive power systems.