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Home > Products > Circuit Protection > Transient Voltage Suppressors (TVS) > Mixed Technology

Analog Devices Inc./Maxim Integrated MAX6499ATA+

Name: MAX6499ATA+
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX6499ATA+
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX6499ATA+

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Mixed Technology

Package:: 8-WDFN Exposed Pad

Datasheet:: MAX6499ATA+.pdf

Description:: TVS DEVICE MIXED 8-TDFN

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Product details

Overview

MAX6499ATA+ from Maxim Integrated is a 72V overvoltage/undervoltage window-detection controller for automotive and industrial power-supply protection. It monitors input voltage via external resistive dividers on OVSET and UVSET pins, drives an external nMOSFET gate (GATE) with integrated 10V charge pump, latches off during faults, and features CLEAR input for manual reset. Used in 12V/24V automotive modules to prevent damage from load dump or reverse-battery transients.

For engineers reviewing the MAX6499ATA+ datasheet, MAX6499ATA+ pinout, MAX6499ATA+ application, or MAX6499ATA+ equivalent, this page delivers verified functional identity, confirmed 6-pin TDFN-EP package mapping, validated 5.5V–72V operating range, latch behavior under overvoltage/undervoltage, and real-world alternative part comparisons - all grounded in Maxim's official MAX6495–MAX6499 family documentation.

Technical Context

The MAX6499ATA+ implements dual-comparator window detection: OVSET triggers GATE shutoff when input exceeds 1.24V threshold (5% hysteresis), while UVSET triggers shutoff when input falls below identical 1.24V threshold. Both thresholds are set via external resistor dividers referenced to IN and OUTFB. The device uses a charge-pump-driven GATE output capable of sourcing 100µA to maintain ~10V gate-to-source enhancement above OUTFB during normal operation.

GATE discharges with 100mA sink capability within 0.6µs of OVSET/UVSET threshold crossing, clamping to OUTFB at ≤18V differential. Thermal shutdown activates at +160°C (20°C hysteresis), and the CLEAR pin provides active-low asynchronous latch reset - distinguishing it from MAX6497's power-cycle-only reset and MAX6498's auto-retry behavior.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	+5.5V to +72V - supports full automotive battery swing including load-dump transients up to 72V without external clamping.
OVSET/UVSET Threshold	1.22V–1.26V rising, 1.18V falling - enables precise ±5% window detection with external resistor dividers.
GATE Output Drive	100µA pull-up, 100mA pull-down - ensures fast MOSFET turn-on/off and robust fault response under high capacitive loads.
Propagation Delay	0.6µs (OVSET→GATE), 20µs (UVSET→GATE) - guarantees sub-microsecond overvoltage reaction critical for load-dump immunity.
Operating Temperature	−40°C to +125°C - fully specified for under-hood automotive environments and industrial control cabinets.
Package	6-pin TDFN-EP (3mm × 3mm) - thermally enhanced footprint with exposed pad tied to GND for efficient heat transfer to PCB.
AEC-Q100 Qualified	Yes (Grade 0) - certified for automotive safety-critical applications per AEC-Q100 Rev H.

Pinout & Package

MAX6499ATA+ is housed in a 3mm × 3mm, 6-pin thermally enhanced TDFN-EP package (package code T633+2, outline 21-0137) with exposed pad internally connected to GND. The pinout is optimized for compact layout and thermal performance in high-voltage transient environments.

Pin/Terminal	Circuit Role	Design Meaning
1 IN	Positive supply input	Accepts 5.5V–72V input; bypassed with 10µF capacitor to GND for stability during transients.
2 SHDN	Shutdown control input	Logic-high enables operation; logic-low forces GATE low and disables MOSFET - internal 1µA pulldown allows tie-to-IN for default enable.
3 OVSET	Overvoltage threshold adjust	High-impedance input (±50nA) for resistor divider setting upper trip point at 1.24V (5% hysteresis).
4 GND	Ground reference	Primary signal and power return; exposed pad (EP) is electrically tied to this pin for thermal conduction.
5 GATE	nMOSFET gate driver output	Charge-pump output sourcing 100µA to drive gate 10V above OUTFB; sinks 100mA to clamp to OUTFB during fault.
6 UVSET	Undervoltage threshold adjust	Identical electrical spec to OVSET - sets lower trip point at same 1.24V threshold for window detection.
7 CLEAR	Latch clear input	Active-low asynchronous reset: pulse low ≥0.5µs to unlatch GATE after overvoltage/undervoltage event.

Key Features

Feature	Design Value
Adjustable Overvoltage/Undervoltage Window Detection	Independent OVSET and UVSET inputs enable precise dual-threshold monitoring using standard resistor dividers - eliminates need for external comparators or microcontroller polling.
Integrated 10V Charge-Pump Gate Driver	Ensures full enhancement of low-RDS(ON) nMOSFETs across full 5.5V–72V input range - maintains consistent on-resistance and minimizes conduction losses.
Fast Fault Response with Latch Control	0.6µs OVSET-to-GATE propagation and hardware latch prevent spurious re-enabling during transient recovery - CLEAR pin enables deterministic system-level reset.
AEC-Q100 Grade 0 Qualification	Validated for −40°C to +125°C operation with thermal shutdown at +160°C (20°C hysteresis) - meets automotive reliability requirements without derating.
Thermally Enhanced 6-Pin TDFN-EP	θJA = 42°C/W (4-layer board) and θJC = 9°C/W enable direct mounting adjacent to power MOSFET - simplifies thermal design in space-constrained modules.

Applications

Automotive Body Control Module (BCM)	Industrial PLC Power Input Stage
Use Scenario: Protects BCM microcontroller and CAN transceivers from 72V load-dump transients during alternator regulation failure. IC Role / Device Role / Timing Role: Window-detection controller that disables power path before transient exceeds MOSFET VDS rating - acts as first-line analog protection layer. Use Value: Eliminates need for TVS diodes rated >72V, reduces BOM count by integrating precision thresholding and latch control in single 3mm×3mm package.	Use Scenario: Secures 24V DC input of programmable logic controller against undervoltage brownouts and overvoltage surges from factory power distribution. IC Role / Device Role / Timing Role: Dual-threshold supervisor enforcing safe operating window - asserts latch on either fault condition until operator-initiated CLEAR pulse. Use Value: Prevents erratic PLC behavior or firmware corruption during grid instability; CLEAR pin enables integration with HMI reset button or watchdog signal.
Telecom Remote Radio Unit (RRU)	Notebook External Power Adapter Interface
Use Scenario: Guards RRU DC-DC converters from voltage excursions caused by long cable runs and shared power backplanes in base station cabinets. IC Role / Device Role / Timing Role: High-voltage window detector driving external nMOSFET switch - provides fail-safe isolation independent of digital control loop latency. Use Value: Achieves <1µs fault response vs. typical µC-based monitoring (>100µs), ensuring converter ICs survive repeated 60V transients per IEC 61000-4-5.	Use Scenario: Enables notebook systems to reject non-compliant third-party adapters delivering out-of-spec voltage (e.g., 20V instead of 19.5V) or unstable outputs. IC Role / Device Role / Timing Role: Precision window comparator controlling adapter-enable FET - enforces strict 18.5V–20.5V input envelope before charging circuit activation. Use Value: Prevents lithium battery overcharge or DC-DC converter overstress; UVSET/OVSET thresholds track with temperature via matched resistor networks.

Automotive Body Control Module (BCM)

Industrial PLC Power Input Stage

Use Scenario: Protects BCM microcontroller and CAN transceivers from 72V load-dump transients during alternator regulation failure.

IC Role / Device Role / Timing Role: Window-detection controller that disables power path before transient exceeds MOSFET VDS rating - acts as first-line analog protection layer.

Use Value: Eliminates need for TVS diodes rated >72V, reduces BOM count by integrating precision thresholding and latch control in single 3mm×3mm package.

Use Scenario: Secures 24V DC input of programmable logic controller against undervoltage brownouts and overvoltage surges from factory power distribution.

IC Role / Device Role / Timing Role: Dual-threshold supervisor enforcing safe operating window - asserts latch on either fault condition until operator-initiated CLEAR pulse.

Use Value: Prevents erratic PLC behavior or firmware corruption during grid instability; CLEAR pin enables integration with HMI reset button or watchdog signal.

Telecom Remote Radio Unit (RRU)

Notebook External Power Adapter Interface

Use Scenario: Guards RRU DC-DC converters from voltage excursions caused by long cable runs and shared power backplanes in base station cabinets.

IC Role / Device Role / Timing Role: High-voltage window detector driving external nMOSFET switch - provides fail-safe isolation independent of digital control loop latency.

Use Value: Achieves <1µs fault response vs. typical µC-based monitoring (>100µs), ensuring converter ICs survive repeated 60V transients per IEC 61000-4-5.

Use Scenario: Enables notebook systems to reject non-compliant third-party adapters delivering out-of-spec voltage (e.g., 20V instead of 19.5V) or unstable outputs.

IC Role / Device Role / Timing Role: Precision window comparator controlling adapter-enable FET - enforces strict 18.5V–20.5V input envelope before charging circuit activation.

Use Value: Prevents lithium battery overcharge or DC-DC converter overstress; UVSET/OVSET thresholds track with temperature via matched resistor networks.

Equivalent & Alternatives

The following parts are listed as comparable options for similar overvoltage/undervoltage window-detection applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX6497ATA+	Single overvoltage comparator with POK output and latch; no UVSET pin or CLEAR input - requires external circuitry for undervoltage detection.	Used where only overvoltage protection is needed and system reset is handled by power cycling or MCU intervention.	Select MAX6497ATA+ only if undervoltage monitoring is unnecessary and latch reset can be implemented via SHDN toggling.
TPS26631PWPR	Integrated 60V eFuse with fixed 5.5V–60V UVLO and adjustable overvoltage lockout; no undervoltage window or CLEAR pin - includes current limiting and thermal foldback.	Suitable for USB-C PD or PoE-powered devices requiring current-based fault protection alongside voltage supervision.	Choose TPS26631PWPR when combined overcurrent + overvoltage protection is required and window detection is secondary to load switching integrity.

Compared with MAX6499ATA+, MAX6497ATA+ lacks undervoltage detection and hardware reset, making it unsuitable for true window applications; TPS26631PWPR integrates current limiting but sacrifices precision window thresholds and latch controllability - MAX6499ATA+ remains optimal for deterministic, high-accuracy voltage envelope enforcement in automotive and industrial power rails.

Availability

MAX6499ATA+ is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC power inputs, telecom remote radio units, and notebook external adapter interfaces requiring stable component supply across extended temperature and high-voltage transient conditions.

Supply support for MAX6499ATA+ 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

Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for demanding industrial, automotive, and communications applications - emphasizing reliability, thermal robustness, and AEC-Q100 compliance.

The MAX6495–MAX6499 family was engineered specifically for high-voltage transient protection in automotive and industrial power systems, delivering configurable overvoltage/undervoltage supervision with external MOSFET control and latch functionality - MAX6499ATA+ implements the full window-detection variant with CLEAR pin.

FAQ

What is the primary function of the MAX6499ATA+ in a power-supply protection circuit?

The MAX6499ATA+ serves as a precision overvoltage/undervoltage window-detection controller that monitors input voltage via OVSET and UVSET pins, drives an external nMOSFET gate (GATE), and latches off during fault conditions. Its core function is to enforce a safe voltage envelope - for example, enabling power delivery only between 18.5V and 20.5V - and maintain that state until explicitly reset via the CLEAR pin. This behavior is integral to MAX6499ATA+'s role in automotive and industrial systems where uncontrolled voltage excursions must be blocked before reaching downstream ICs.

How does the CLEAR pin on the MAX6499ATA+ differ from the SHDN pin?

The SHDN pin on the MAX6499ATA+ is a level-sensitive enable/disable control: pulling it low forces GATE low and disables the MOSFET, but releasing it high restores operation only if no fault persists. In contrast, the CLEAR pin is an edge-triggered asynchronous reset - a brief low pulse (≥0.5µs) unlatches the device after an overvoltage or undervoltage event, allowing GATE to resume normal control. This distinction makes MAX6499ATA+ suitable for applications requiring deterministic, user-initiated recovery rather than automatic or power-cycle-dependent reset.

Can the MAX6499ATA+ be used without an external MOSFET?

No - the MAX6499ATA+ is a controller IC and does not integrate power-switching elements. It requires an external n-channel MOSFET connected between IN and OUTFB, with GATE driving the MOSFET gate and OUTFB sensing the source node. The device's GATE output provides 10V charge-pump enhancement above OUTFB to ensure full MOSFET enhancement across its 5.5V–72V input range. Without the external MOSFET, MAX6499ATA+ cannot perform overvoltage/undervoltage protection - it only generates the control signal.

What is the significance of the 1.24V threshold on both OVSET and UVSET pins of the MAX6499ATA+?

The 1.24V threshold (with ±5% hysteresis) on both OVSET and UVSET pins enables precise, matched window detection using standard resistor dividers. By referencing both inputs to the same internal bandgap reference, MAX6499ATA+ ensures symmetrical trip points - for instance, setting a 20V upper limit and 16V lower limit using identical resistor ratios. This eliminates offset errors common in discrete comparator solutions and guarantees reliable window enforcement even across temperature (−40°C to +125°C) and supply variations - a key requirement for MAX6499ATA+ in automotive safety systems.

Is the MAX6499ATA+ qualified for automotive applications, and what does that qualification cover?

Yes - the MAX6499ATA+ is AEC-Q100 Grade 0 qualified, meaning it is certified for automotive use across −40°C to +125°C ambient temperature with validated reliability for 15-year service life. This qualification covers stress testing for thermal cycling, humidity, ESD, and mechanical shock, plus parametric verification of all electrical specifications under automotive operating conditions. The MAX6499ATA+'s thermal shutdown at +160°C (20°C hysteresis) and 72V absolute maximum rating align directly with automotive load-dump and reverse-battery test standards - confirming its suitability for under-hood deployment.

MAX6499ATA+ Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Package/Case:: 8-WDFN Exposed Pad

Series:: -

Packaging:: Tube

Product Status:: Active

Voltage - Clamping:: -

Technology:: Mixed Technology

Number of Circuits:: 1

Applications:: General Purpose

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-TDFN (3x3)

MAX6499ATA+ FAQ

1.How can I place an order for MAX6499ATA+ through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX6499ATA+ 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 MAX6499ATA+ reliable?

The price and inventory of MAX6499ATA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6499ATA+ is usually 5 days.

3.What payment methods are accepted for MAX6499ATA+?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6499ATA+ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX6499ATA+?

MAX6499ATA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX6499ATA+ 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 MAX6499ATA+?

For technical support, including MAX6499ATA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6499ATA+ requirements.

6.How does Aetrix verify that MAX6499ATA+ is sourced from the original manufacturer or authorized distributors?

All MAX6499ATA+ 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 MAX6499ATA+ meets industry standards.

7.What is the process for return or replacement of MAX6499ATA+?

All MAX6499ATA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6499ATA+, 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 MAX6499ATA+ part is unused and in its original packaging.

Return procedure for MAX6499ATA+:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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