My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6728AKASVD3+T
- Part No.:
- MAX6728AKASVD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6728AKASVD3+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,619
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX6728AKASVD3+T from Maxim Integrated is a dual-supply ultra-low-voltage microprocessor supervisory circuit designed to monitor VCC1 (primary) and VCC2 (secondary) supply rails while providing power-fail detection via PFI/PFO, manual reset (MR), and open-drain active-low RST output. It features factory-trimmed reset thresholds of 4.625V (VCC1) and 0.788V (VCC2), 280ms minimum reset timeout, and operates from -40°C to +125°C in SOT23-6 package. It is used in telecom power systems to ensure reliable boot and brownout recovery.
For engineers reviewing the MAX6728AKASVD3+T datasheet, MAX6728AKASVD3+T pinout, MAX6728AKASVD3+T application, or MAX6728AKASVD3+T equivalent, key selection criteria include its dual-rail monitoring capability with independent low-voltage VCC2 support (down to 0.765V), guaranteed reset validity at VCC ≥ 0.8V, integrated power-fail comparator with 626.5mV reference, and AEC-Q100–compatible qualification for industrial reliability.
Technical Context
This device implements two independent voltage comparators - one for VCC1 (1.58V–4.63V thresholds) and one for VCC2 (0.765V–3.15V thresholds) - each feeding into a shared reset timeout timer. The internal 626.5mV reference enables precise PFI-based power-fail detection and supports external resistor-divider networks for auxiliary voltage monitoring.
It integrates a power-fail comparator with 2µs propagation delay, manual-reset input with 50kΩ internal pullup to VCC1 and 1µs minimum pulse width requirement, and open-drain RST output referenced to VCC1. All logic states remain valid down to VCC1 or VCC2 = 0.8V, ensuring robust operation during deep brownouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.625V (typ), factory-trimmed; ensures reliable reset assertion when primary rail drops below nominal 4.63V level |
| VCC2 Reset Threshold | 0.788V (typ), factory-trimmed; enables supervision of sub-1V core supplies such as 0.9V or 0.8V domains |
| Reset Timeout Period | 280ms (min); provides sufficient hold time for slow-starting DC-DC converters and firmware initialization |
| PFI Threshold Voltage | 626.5mV (typ); fixed internal reference for accurate power-fail detection across temperature (-40°C to +125°C) |
| Supply Current (ICC) | 15µA (typ) at 3.6V; ultra-low quiescent current extends battery life in portable equipment |
| Operating Temperature | -40°C to +125°C; qualified for under-hood automotive and industrial environments requiring extended thermal range |
| Package | SOT23-6 (U6+1); compact 6-pin surface-mount footprint with 1.6mm × 2.9mm body and 0.95mm height |
Pinout & Package
SOT23-6 package (package code U6+1), 1.6mm × 2.9mm × 0.95mm, JEDEC MO-178AC compliant, thermal resistance θJA = 115°C/W on multilayer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low open-drain reset output; requires external pullup; asserts when VCC1/VCC2 drop below threshold or MR is pulled low |
| 2 | GND | Ground reference for all internal comparators and logic; must be connected to system ground plane |
| 3 | MR | Active-low manual-reset input; internal 50kΩ pullup to VCC1; 1µs minimum pulse width required for reliable assertion |
| 4 | VCC2 | Secondary supply input; powers internal VCC2 comparator and sets VCC2 reset threshold reference |
| 5 | VCC1 | Primary supply input; powers device core, resets timeout timer, and references RST output high-level |
| 6 | PFI | Power-fail input; high-impedance node tied to internal 626.5mV comparator; used with resistor divider to monitor auxiliary rail |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent supply monitoring | Simultaneous supervision of VCC1 (1.58V–4.63V) and VCC2 (0.765V–3.15V) with separate thresholds and hysteresis |
| Integrated power-fail comparator | 626.5mV internal reference with 2µs PFI-to-PFO delay; enables early warning shutdown before critical brownout |
| Guaranteed reset validity at low VCC | Reset logic remains functional down to VCC1 or VCC2 = 0.8V - critical for fail-safe behavior during deep undervoltage events |
| Low supply current | 15µA typical ICC at 3.6V - reduces system standby power and extends battery runtime in portable designs |
| Immunity to short VCC transients | Withstands negative-going VCC glitches ≤20µs (at 100mV overdrive), preventing spurious resets in noisy power environments |
Applications
| Telecom Power Management | Industrial PLC Controllers |
|---|---|
|
Use Scenario: Monitoring redundant 48V DC-DC converter outputs and 3.3V/1.2V FPGA core rails in carrier-grade base station power modules. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting RST to halt processor execution upon any rail collapse, with 280ms timeout allowing safe state save before shutdown. Use Value: Prevents corrupted configuration writes during partial power loss by guaranteeing reset assertion before VCC2 falls below 0.765V threshold. |
Use Scenario: Ensuring deterministic startup and fault recovery in DIN-rail mounted programmable logic controllers exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Supervising 24V system bus and 5V I/O supply while using PFI to detect upstream AC/DC converter degradation. Use Value: Enables graceful firmware-initiated shutdown via PFO interrupt before main CPU loses regulation, meeting IEC 61000-4-29 immunity requirements. |
| Automotive ADAS Camera Modules | Medical Portable Diagnostic Devices |
|
Use Scenario: Validating 12V input and 1.8V image sensor core supply in rear-view camera ECU operating under engine cranking conditions. IC Role / Device Role / Timing Role: Monitoring VCC1 (12V) and VCC2 (1.8V) with reset asserted if either drops below threshold; MR allows service-mode forced reset. Use Value: Maintains reset assertion down to VCC = 0.8V, ensuring MCU remains held during cold-crank dips to 6V without false release. |
Use Scenario: Supervising lithium-ion battery-backed 3.3V main logic rail and 1.1V ADC reference rail in handheld ultrasound units. IC Role / Device Role / Timing Role: Dual-supply monitoring with PFI used to trigger low-battery alert before shutdown; RST prevents partial firmware execution. Use Value: 15µA supply current minimizes battery drain during sleep mode, extending operational time between charges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6723AKASVD3+T | Includes RSTIN input for third-voltage monitoring (0.626V reference); same VCC1/VCC2 thresholds and 280ms timeout | Required where triple-rail supervision (e.g., VCC1/VCC2/RSTIN) is needed; adds external resistor-divider complexity | Select MAX6723AKASVD3+T only if monitoring a third supply (e.g., battery backup) is mandatory; otherwise MAX6728AKASVD3+T offers simpler BOM |
| TPS3808G33DBVR | Single-supply supervisor (3.3V threshold only); no VCC2 monitoring or PFI capability; 200ms timeout; SOT23-6 package | Limited to single-rail systems; lacks power-fail detection and secondary supply supervision | Choose TPS3808G33DBVR only for cost-sensitive 3.3V-only applications without auxiliary rail or PFI needs; not functionally equivalent |
Compared with MAX6723AKASVD3+T, the MAX6728AKASVD3+T omits RSTIN to reduce external component count and simplify layout; compared with TPS3808G33DBVR, it delivers true dual-rail supervision and integrated power-fail functionality essential for multivoltage systems.
Availability
MAX6728AKASVD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial control, and automotive ADAS applications requiring stable component supply, extended temperature operation, and dual-rail brownout protection.
Supply support for MAX6728AKASVD3+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) is a semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX6715A–MAX6729A family was designed specifically for high-reliability multivoltage systems needing simultaneous supervision of primary and secondary rails with guaranteed operation down to 0.8V supply.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6728AKASVD3+T?
The MAX6728AKASVD3+T has a factory-trimmed VCC1 reset threshold of 4.625V (typical), with min/max values of 4.500V and 4.750V respectively. This value is encoded in the "K" suffix per Maxim's Reset Voltage Threshold Suffix Guide and applies across the full -40°C to +125°C operating range with ±20ppm/°C tempco.
Does the MAX6728AKASVD3+T support monitoring a third voltage rail?
No, the MAX6728AKASVD3+T does not include an RSTIN input. It is a dual-supply supervisor monitoring only VCC1 and VCC2. For triple-voltage monitoring, consider the pin-compatible MAX6723AKASVD3+T, which adds the RSTIN terminal while retaining identical VCC1/VCC2 thresholds and 280ms timeout.
What is the function of Pin 6 (PFI) on the MAX6728AKASVD3+T?
Pin 6 (PFI) is the power-fail input terminal of the MAX6728AKASVD3+T. It connects to an internal 626.5mV comparator and is used with an external resistor divider to monitor auxiliary voltages (e.g., battery or preregulated input). When PFI falls below 626.5mV, the PFO output asserts low - independently of the main reset timeout.
Can the MAX6728AKASVD3+T operate with VCC2 below 1.0V?
Yes, the MAX6728AKASVD3+T supports VCC2 as low as 0.765V (minimum threshold) and guarantees valid reset logic down to VCC2 = 0.8V. Its VCC2 threshold is factory-trimmed to 0.788V (typ), making it suitable for supervising modern sub-1V core supplies like 0.9V or 0.8V FPGA domains.
What package type and footprint does the MAX6728AKASVD3+T use?
The MAX6728AKASVD3+T uses a SOT23-6 package (outline number 21-0058, land pattern 90-0175), also designated U6+1. It measures 1.6mm × 2.9mm × 0.95mm and is RoHS-compliant. The pinout matches standard SOT23-6 layouts, with Pin 1 = RST, Pin 2 = GND, Pin 3 = MR, Pin 4 = VCC2, Pin 5 = VCC1, Pin 6 = PFI.
MAX6728AKASVD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.575V, 2.925V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6728AKASVD3+T FAQ
1.How can I place an order for MAX6728AKASVD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6728AKASVD3+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 MAX6728AKASVD3+T reliable?
The price and inventory of MAX6728AKASVD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6728AKASVD3+T is usually 5 days.
3.What payment methods are accepted for MAX6728AKASVD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6728AKASVD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6728AKASVD3+T?
MAX6728AKASVD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6728AKASVD3+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 MAX6728AKASVD3+T?
For technical support, including MAX6728AKASVD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6728AKASVD3+T requirements.
6.How does Aetrix verify that MAX6728AKASVD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6728AKASVD3+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 MAX6728AKASVD3+T meets industry standards.
7.What is the process for return or replacement of MAX6728AKASVD3+T?
All MAX6728AKASVD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6728AKASVD3+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 MAX6728AKASVD3+T part is unused and in its original packaging.
Return procedure for MAX6728AKASVD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6728AKASVD3+T Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
