My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6735AKAYHD3+T
- Part No.:
- MAX6735AKAYHD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6735AKAYHD3+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,028
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6735AKAYHD3+T from Maxim Integrated is a triple-voltage microprocessor supervisor IC with independent watchdog output, monitoring +3.075V (VCC1), +2.188V (VCC2), and an adjustable input down to +0.626V (RSTIN), featuring 210ms reset timeout, push-pull RST/WDO outputs, and manual reset input - deployed in telecom power sequencing and industrial controller boot integrity.
For engineers reviewing the MAX6735AKAYHD3+T datasheet, MAX6735AKAYHD3+T pinout, MAX6735AKAYHD3+T application, or MAX6735AKAYHD3+T equivalent, this page delivers verified electrical parameters, temperature-stable threshold hysteresis, watchdog startup delay (35s min), supply current (14µA typ at +3.6V), and SOT23-8 package compatibility for multivoltage embedded system design.
Technical Context
The MAX6735AKAYHD3+T implements dual-mode watchdog logic: a 35s minimum initial timeout after reset enables full system initialization, followed by 1.12s minimum normal-mode timeout for rapid fault detection. Its triple-monitor architecture uses separate internal references - 3.075V for VCC1, 2.188V for VCC2, and a fixed 626mV comparator for RSTIN - each with 20ppm/°C tempco and 0.5% hysteresis.
Reset assertion is guaranteed valid down to VCC1 or VCC2 = +0.8V; the push-pull RST and WDO outputs drive loads up to 800µA high and sink 3.2mA low at +4.5V, while RSTIN accepts high-impedance voltage-divider inputs with ±100nA leakage and 22µs propagation delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | +3.075V nominal (Y suffix), ±125mV tolerance over -40°C to +125°C - sets primary supply brownout detection point for +3.3V rails |
| VCC2 Reset Threshold | +2.188V nominal (H suffix), ±125mV tolerance - monitors secondary +2.2V or +1.8V domain with guaranteed operation down to +0.8V supply |
| RSTIN Threshold | +626mV fixed reference, ±15.5mV - enables third-supply monitoring via external resistor divider (e.g., +5V, +12V) |
| Reset Timeout Period | D3 suffix = 140ms to 280ms - ensures sufficient hold time for processor core initialization before release |
| Watchdog Timeout | 35s min initial period, 1.12s min normal period - prevents premature lockup detection during boot, then enforces tight software execution checks |
| Supply Current | 14µA typical at +3.6V - supports battery-backed systems and low-power always-on supervision without significant drain |
| Operating Temp Range | -40°C to +125°C - qualified for under-hood automotive, industrial PLC, and telecom base station environments |
Pinout & Package
MAX6735AKAYHD3+T is housed in an 8-pin SOT23-8 package (K8S-3), measuring 3.00mm × 1.75mm × 1.30mm, with gull-wing leads, JEDEC MO178 BA-compliant outline, and lead-free (+T) finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output; asserts when VCC1/VCC2/RSTIN drop below thresholds or MR is pulled low; drives µP reset pin directly without pullup |
| 2 | GND | System ground reference for all internal comparators and output drivers |
| 3 | VCC2 | Secondary supply input; powers internal circuitry when > VCC1 and serves as reference for +2.188V monitor |
| 4 | MR | Active-low manual reset input; internally pulled up to VCC1 (50kΩ); initiates reset and clears watchdog on logic-low pulse ≥1µs |
| 5 | WDI | Watchdog input; edge-sensitive (rising/falling); floating state does not disable timer; requires periodic toggling to prevent WDO assertion |
| 6 | VCC1 | Primary supply input; powers device when > VCC2 and serves as reference for +3.075V monitor |
| 7 | RSTIN | Adjustable reset comparator input; high-impedance (±100nA), referenced to 626mV - used with external divider to monitor third voltage |
| 8 | WDO | Active-low push-pull watchdog output; asserts if no WDI transition occurs within timeout; deasserts immediately upon valid edge or threshold recovery |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent voltage monitoring | Simultaneously supervises +3.075V (VCC1), +2.188V (VCC2), and adjustable third rail (e.g., +5V via RSTIN divider) - eliminates need for three discrete supervisors |
| Dual-mode watchdog timer | 35s startup delay allows full firmware boot before enforcement; 1.12s normal mode detects stalled code faster than single-mode alternatives |
| Push-pull RST and WDO outputs | Eliminates external pullup resistors required by open-drain variants - reduces BOM count and PCB area in space-constrained designs |
| Guaranteed reset validity to +0.8V | Ensures clean reset assertion even during deep brownout conditions where many supervisors fail - critical for fail-safe industrial control |
| Immunity to short VCC transients | Rejects glitches ≤100ns at 75mV overdrive - prevents spurious resets in noisy power environments without added RC filtering |
Applications
| Telecom Power Sequencing | Industrial PLC Boot Integrity |
|---|---|
Use Scenario: Sequencing +48V DC-DC converters, +3.3V core, +2.5V I/O, and +1.2V FPGA rails in carrier-grade access equipment. IC Role / Device Role / Timing Role: Triple-voltage supervisor triggers coordinated reset across domains only when all rails stabilize within spec, using RSTIN to monitor isolated bias supply. Use Value: Prevents partial initialization faults by enforcing strict AND-gated reset release - avoids corrupted register states in multi-rail SoCs. |
Use Scenario: Ensuring deterministic startup of ARM-based controllers in factory automation cabinets exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Monitors main +24V input, +5V logic, and +3.3V MCU core; leverages -40°C to +125°C rating and 20ppm/°C threshold stability. Use Value: Guarantees reset assertion remains valid down to VCC = +0.8V - eliminates risk of silent boot failure during cold-start voltage sag. |
| Server Board Management | Battery-Powered Edge Node |
Use Scenario: BMC-initiated reset coordination across CPU, memory, and PCIe switch rails in 1U rack servers. IC Role / Device Role / Timing Role: Uses MR input for BMC-driven resets and WDO to detect firmware hangs; push-pull outputs interface directly with bidirectional reset pins via 10kΩ isolation. Use Value: Eliminates contention risk with µP reset I/O ports - avoids bus conflicts that cause unrecoverable lockups during remote management. |
Use Scenario: Long-life IoT sensor node powered by LiSOCl₂ battery, requiring ultra-low quiescent current and reliable brownout detection. IC Role / Device Role / Timing Role: Supervises +3.6V main rail and +1.8V sensor interface; RSTIN monitors battery voltage via divider to trigger graceful shutdown before depletion. Use Value: 14µA typical supply current extends operational life; adjustable RSTIN threshold enables precise end-of-life voltage detection without extra ADC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6734AKAYHD3+T | Same pinout and thresholds, but open-drain RST/WDO outputs require external pullups | Suitable where level-shifting or wired-OR reset buses are needed; incompatible with direct µP reset pin drive without pullup | Select when system-level reset bus sharing or voltage translation is required; avoid if minimizing external components is priority |
| TPS3808G33DBVR | Dual-voltage (not triple), fixed +3.3V/+1.8V thresholds, no RSTIN, 200ms timeout, 2.5µA IQ | Lacks third-supply monitoring and manual reset; optimized for ultra-low-power dual-rail apps like wearables | Choose only for simple dual-rail systems without adjustable monitoring or MR; insufficient for telecom/server multivoltage use cases |
Compared with MAX6734AKAYHD3+T, the MAX6735AKAYHD3+T's push-pull outputs reduce component count and simplify layout; versus TPS3808G33DBVR, it adds critical RSTIN flexibility and MR support essential for complex embedded boot sequences.
Availability
MAX6735AKAYHD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and server board management requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX6735AKAYHD3+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.
The MAX6730A–MAX6735A family targets high-reliability embedded systems needing multivoltage supervision, robust watchdog protection, and guaranteed operation across harsh thermal environments.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6735AKAYHD3+T?
The MAX6735AKAYHD3+T has a VCC1 reset threshold of +3.075V (Y suffix) and VCC2 threshold of +2.188V (H suffix), with ±125mV tolerance over -40°C to +125°C. These values are factory-trimmed and specified in Table 1 of the datasheet; the YH combination identifies this specific variant of the MAX6735AKAYHD3+T.
Does the MAX6735AKAYHD3+T support manual reset functionality?
Yes, the MAX6735AKAYHD3+T includes an active-low manual reset input (MR) with internal 50kΩ pullup to VCC1. Driving MR low forces RST assertion and clears the watchdog timer; the reset remains active for the full D3 timeout period (140–280ms) after MR returns high - a confirmed feature per Pin Description and Detailed Description sections.
What is the watchdog timeout behavior of the MAX6735AKAYHD3+T during power-up?
The MAX6735AKAYHD3+T implements a dual-mode watchdog: after any reset event (power-up, brownout, or MR), it enforces a minimum 35s initial timeout (tWD-L) to allow full system initialization, then switches to 1.12s minimum normal timeout (tWD-S) upon first valid WDI edge - explicitly documented in Electrical Characteristics and Detailed Description.
Can the MAX6735AKAYHD3+T monitor a third voltage higher than +0.626V?
Yes, the MAX6735AKAYHD3+T uses its RSTIN pin with a fixed +626mV internal reference; connecting a resistive voltage divider between the target supply and GND allows monitoring of voltages such as +5V or +12V - detailed in Figure 2 and Adjustable Input Voltage section, confirming RSTIN's role as a configurable third-supply monitor.
What package type and dimensions does the MAX6735AKAYHD3+T use?
The MAX6735AKAYHD3+T is packaged in an 8-pin SOT23-8 (K8S-3) case: 3.00mm × 1.75mm footprint, 1.30mm max height, gull-wing leads, JEDEC MO178 BA-compliant, with lead-free (+T) finish - specified in Ordering Information and Package Information sections, and visually confirmed in Pin Configurations diagram.
MAX6735AKAYHD3+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:
- 1.313V, 2.188V, Adj
- Output:
- Push-Pull, Totem Pole
- 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
MAX6735AKAYHD3+T FAQ
1.How can I place an order for MAX6735AKAYHD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6735AKAYHD3+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 MAX6735AKAYHD3+T reliable?
The price and inventory of MAX6735AKAYHD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6735AKAYHD3+T is usually 5 days.
3.What payment methods are accepted for MAX6735AKAYHD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6735AKAYHD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6735AKAYHD3+T?
MAX6735AKAYHD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6735AKAYHD3+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 MAX6735AKAYHD3+T?
For technical support, including MAX6735AKAYHD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6735AKAYHD3+T requirements.
6.How does Aetrix verify that MAX6735AKAYHD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6735AKAYHD3+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 MAX6735AKAYHD3+T meets industry standards.
7.What is the process for return or replacement of MAX6735AKAYHD3+T?
All MAX6735AKAYHD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6735AKAYHD3+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 MAX6735AKAYHD3+T part is unused and in its original packaging.
Return procedure for MAX6735AKAYHD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6735AKAYHD3+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…
