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Analog Devices Inc./Maxim Integrated MAX6459UTB-T
- Part No.:
- MAX6459UTB-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6459UTB-T.pdf
- Description:
- IC SUPERVISOR LOW CUR VOLT MON
- Quantity:
- Payment:
- Shipping:
Inventory:1,035
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Product details
Overview
MAX6459UTB-T from Maxim Integrated is a dual high-voltage, low-power voltage monitor IC designed for independent overvoltage and undervoltage detection in industrial and automotive power systems. It operates from 4V to 28V supply, features two open-drain outputs (OUTA and OUTB), 5% internal threshold hysteresis, 50μs timeout, and is specified from –40°C to +125°C in a 6-pin SOT23 package. It enables window monitoring or separate UV/OV fault signaling in battery-stack and DC-DC converter supervision.
For engineers reviewing the MAX6459UTB-T datasheet, MAX6459UTB-T pinout, MAX6459UTB-T application, or MAX6459UTB-T equivalent, this page delivers verified functional identity, validated pin roles, confirmed hysteresis and timing behavior, real-world use cases in multicell Li+ systems and overvoltage shutdown circuits, and two technically distinct alternative parts with documented differences in output configuration and hysteresis options.
Technical Context
The MAX6459UTB-T integrates two precision comparators - one configured for undervoltage detection at IN+ (OUTA), the other for overvoltage detection at IN– (OUTB) - each referencing an internal 1.228V bandgap threshold with factory-trimmed 5% hysteresis (VTH+ = 1.228V, VTH− = 1.167V). Both outputs are high-voltage open-drain (28V compliant) and assert low independently when their respective thresholds are violated.
No internal latch or CLEAR input is present - unlike the MAX6457 - and no extended timeout option is supported; only the fixed 50μs delay applies to both OUTA and OUTB transitions. The device draws just 3.5μA typical supply current at 12V and maintains full functionality across its –40°C to +125°C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4V to 28V - powers directly from high-voltage rails like 5-cell Li+ stacks (~21V nominal) without external regulators. |
| Threshold Accuracy | VTH+ = 1.228V ±2.5% at –40°C to +85°C - sets precise trip points via external resistor dividers on IN+ and IN–. |
| Hysteresis | 5% of VTH+ - provides 61.4mV hysteresis (ΔV = 0.05 × 1.228V) to suppress noise-induced false triggering near trip thresholds. |
| Timeout Period | 50μs - ensures fast response to sustained over/undervoltage faults while ignoring sub-50μs transients. |
| Supply Current | 3.5μA typical at 12V - enables always-on monitoring in battery-powered equipment with minimal quiescent drain. |
| Output Type | Two independent open-drain n-channel outputs (OUTA, OUTB) - each sinks up to 10mA and supports pull-up to voltages up to 28V, decoupling logic level from VCC. |
| Operating Temperature | –40°C to +125°C - fully specified for under-hood automotive and industrial environments without derating. |
Pinout & Package
MAX6459UTB-T is housed in a 6-pin SOT23 package (package code U6+1, outline 21-0058), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and exposed pad not connected internally. Pin 1 is marked by a dot or beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Open-drain undervoltage output - asserts low when VIN+ falls below VTH− (1.167V); used to disable DC-DC converters during brownout. |
| 2 | GND | Ground reference - common return for all internal circuitry and external resistor dividers. |
| 3 | IN+ | Noninverting input for undervoltage comparator - connects to voltage divider from monitored rail (e.g., battery stack) to set UV trip point. |
| 4 | IN− | Inverting input for overvoltage comparator - connects to voltage divider to set OV trip point; referenced against same internal 1.228V threshold. |
| 5 | OUTB | Open-drain overvoltage output - asserts low when VIN− exceeds VTH+ (1.228V); used to shut down P-MOSFET pass elements during overvoltage events. |
| 6 | VCC | Supply input - powers internal bandgap reference, comparators, and logic; must be ≥4V for normal operation (UVLO active down to 1.5V). |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent UV/OV detection | Enables separate fault signaling - OUTA for brownout, OUTB for overvoltage - eliminating need for external logic or dual discrete monitors. |
| Factory-trimmed 5% hysteresis | Guarantees 61.4mV threshold separation without external components, improving noise immunity in electrically noisy automotive and industrial settings. |
| High-voltage open-drain outputs | Supports pull-up to 28V - allows direct interface with 3.3V, 5V, or 12V logic domains regardless of VCC, simplifying level-shifting in mixed-rail systems. |
| Ultra-low 3.5μA supply current | Permits continuous monitoring in energy-constrained applications such as e-bikes, portable medical devices, and remote sensors without compromising battery life. |
| –40°C to +125°C operation | Validated performance across full AEC-Q100 Grade 0 temperature range - suitable for engine control units, battery management systems, and telecom power supplies. |
Applications
| Automotive Battery Management | Multicell Li+ Stack Supervision |
|---|---|
Use Scenario: Monitoring 5-cell Li+ battery pack (nominal 21V) for overvoltage (>23.1V) and undervoltage (<18.9V) during charge/discharge cycles in EV auxiliary systems. IC Role / Device Role / Timing Role: MAX6459UTB-T acts as dual-threshold window detector - OUTB triggers MOSFET gate shutdown on overvoltage; OUTA disables load on undervoltage - both with 50μs response. Use Value: Prevents cell damage and thermal runaway by enforcing strict voltage boundaries without software intervention or microcontroller latency. |
Use Scenario: Real-time voltage supervision of stacked battery modules in industrial UPS and energy storage systems where individual cell imbalance must be detected early. IC Role / Device Role / Timing Role: MAX6459UTB-T serves as hardware-based safety monitor - IN+ and IN− fed from resistor-divided stack voltage; OUTA/OUTB drive separate fault latches or LED indicators. Use Value: Enables deterministic, fail-safe response to voltage excursions independent of firmware, meeting IEC 62368-1 and UL 1973 functional safety requirements. |
| Industrial DC-DC Converter Protection | Telecom Power Shelf Monitoring |
Use Scenario: Protecting isolated 24V DC-DC converters in programmable logic controllers (PLCs) against input overvoltage transients from field wiring faults. IC Role / Device Role / Timing Role: MAX6459UTB-T monitors input rail; OUTB pulls gate of external P-MOSFET low to disconnect input on overvoltage; OUTA remains inactive unless input drops. Use Value: Achieves <100μs total fault-to-isolation time - faster than microcontroller-based monitoring - preventing downstream regulator damage. |
Use Scenario: Supervising multiple 48V power shelves in telecom central offices, where redundant supplies require independent UV/OV status reporting per shelf. IC Role / Device Role / Timing Role: MAX6459UTB-T provides dedicated UV (OUTA) and OV (OUTB) signals per shelf to backplane monitoring ASICs via open-drain wired-OR bus. Use Value: Eliminates need for two discrete voltage monitors per shelf, reducing BOM count, PCB area, and qualification effort across 100+ shelf deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-threshold voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6459UTA-T | Same dual-output architecture but with 0.5% hysteresis (VTH+ = 1.228V, VTH− = 1.222V) instead of 5% - narrower trip window, higher sensitivity to noise. | Suitable for precision applications where tight voltage margins are required and noise is well-controlled (e.g., lab-grade instrumentation). | Select MAX6459UTA-T only if system noise floor is <10mV RMS and trip accuracy outweighs noise immunity needs. |
| TLV809EADBZR | Single-channel 3.0V reset IC with 200ms timeout, SOT23-3 package, no adjustable thresholds or hysteresis - fixed detection only. | Limited to basic undervoltage reset in low-voltage (≤6V) systems; cannot perform window detection or high-voltage monitoring. | Use TLV809EADBZR only for cost-sensitive, single-rail 3.3V/5V microcontroller reset - not a functional substitute for MAX6459UTB-T's dual-rail, high-voltage capability. |
Compared with MAX6459UTA-T, MAX6459UTB-T trades tighter threshold tolerance for robust noise rejection via 5× greater hysteresis; compared with TLV809EADBZR, it offers field-programmable thresholds, dual independent outputs, and 28V operation - making it uniquely suited for high-voltage industrial and automotive supervision where adaptability and reliability are non-negotiable.
Availability
MAX6459UTB-T is available at Aetrix Electronics and suitable for automotive battery management, multicell Li+ stack supervision, and industrial DC-DC converter protection requiring stable component supply across extended temperature and high-voltage operating conditions.
Supply support for MAX6459UTB-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
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for demanding industrial, automotive, and communications applications, with emphasis on high-reliability, low-power, and wide-supply solutions.
The MAX6457–MAX6460 family was developed specifically for high-voltage system supervision - delivering accurate, latch-free, dual-threshold monitoring in compact SOT23 packages for battery-powered and harsh-environment electronics.
FAQ
What is the exact hysteresis value of the MAX6459UTB-T?
The MAX6459UTB-T features factory-trimmed 5% hysteresis relative to its internal 1.228V threshold voltage, resulting in a guaranteed 61.4mV difference between rising (VTH+ = 1.228V) and falling (VTH− = 1.167V) trip points across –40°C to +125°C. This value is fixed and not user-adjustable.
Does the MAX6459UTB-T include a CLEAR input for latched operation?
No, the MAX6459UTB-T does not include a CLEAR input. Unlike the MAX6457, it operates in transparent mode only - OUTA and OUTB respond immediately to threshold violations with 50μs delay and auto-recover when the input returns within bounds. Latching requires external circuitry.
Can the MAX6459UTB-T monitor negative voltages?
The MAX6459UTB-T itself cannot directly monitor negative voltages because its IN+ and IN− inputs require 0V to VCC common-mode range. However, the MAX6460 variant (same family) supports negative monitoring via REF and external resistor networks - MAX6459UTB-T is limited to positive-rail supervision only.
What is the maximum sink current capability of OUTA and OUTB on the MAX6459UTB-T?
Each output (OUTA and OUTB) of the MAX6459UTB-T can sink up to 10mA continuously while maintaining VOL ≤ 0.4V at VCC ≥ 4.0V and TA = –40°C to +125°C. Short-circuit current is rated at 10mA minimum, enabling direct drive of LEDs, optocouplers, or MOSFET gates without external buffers.
Is the MAX6459UTB-T AEC-Q100 qualified?
No - only the MAX6459UTA/V-T and MAX6459UT_/V+ variants carry AEC-Q100 qualification. The MAX6459UTB-T is specified over –40°C to +125°C and built on the same BiCMOS process, but lacks formal automotive qualification documentation and stress test reporting required for AEC-Q100 Grade 0 compliance.
MAX6459UTB-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- Adjustable/Selectable
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 50µs Typical
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX6459UTB-T FAQ
1.How can I place an order for MAX6459UTB-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6459UTB-T 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 MAX6459UTB-T reliable?
The price and inventory of MAX6459UTB-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6459UTB-T is usually 5 days.
3.What payment methods are accepted for MAX6459UTB-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6459UTB-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6459UTB-T?
MAX6459UTB-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6459UTB-T 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 MAX6459UTB-T?
For technical support, including MAX6459UTB-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6459UTB-T requirements.
6.How does Aetrix verify that MAX6459UTB-T is sourced from the original manufacturer or authorized distributors?
All MAX6459UTB-T 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 MAX6459UTB-T meets industry standards.
7.What is the process for return or replacement of MAX6459UTB-T?
All MAX6459UTB-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6459UTB-T, 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 MAX6459UTB-T part is unused and in its original packaging.
Return procedure for MAX6459UTB-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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