My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6305UK00D3-T
- Part No.:
- MAX6305UK00D3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6305UK00D3-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,755
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX6305UK00D3-T from Maxim Integrated is a 5-pin SOT23 programmable reset IC designed to monitor VCC and assert an active-low open-drain RESET signal when supply voltage falls below a factory-set 2.5V threshold. It features a 140ms (min) reset timeout, 8µA supply current at +25°C, and guaranteed RESET validity down to VCC = 1V. It is used in multivoltage embedded systems requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6305UK00D3-T datasheet, MAX6305UK00D3-T pinout, MAX6305UK00D3-T application, or MAX6305UK00D3-T equivalent, key selection considerations include its fixed 2.5V VCC reset threshold, SOT23-5 package, manual-reset input absence, dual undervoltage inputs (RST IN1/RST IN2), and immunity to fast VCC transients up to ~200µs at 2.5V overdrive.
Technical Context
The MAX6305UK00D3-T monitors two adjustable undervoltage inputs (RST IN1 and RST IN2) referenced to a precise 1.23V internal bandgap comparator, with ±25nA input leakage enabling high-impedance resistor-divider programming. It does not monitor VCC internally-unlike MAX6306–MAX6313 variants-and relies entirely on external divider networks for all reset thresholds.
Its open-drain RESET output requires an external pull-up and remains valid down to VCC = 1V; it lacks manual reset (MR) and overvoltage (OVRST IN) inputs. The device operates across 0°C to +70°C and draws only 8µA typical supply current, making it suitable for battery-backed and portable applications where low quiescent power and dual-supply monitoring are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.0V to 5.5V - supports operation during deep brownout and full-system power-up sequencing. |
| Reset Threshold | 2.5V nominal (factory-programmed) - sets minimum VCC level before reset assertion; ±1.5% tolerance at +25°C. |
| Reset Timeout Period | 140ms minimum - ensures µP remains held in reset long enough for stable clock and supply settling. |
| Supply Current | 8µA typical at +25°C - enables multi-year battery life in always-on portable instrumentation. |
| RESET Output Type | Active-low, open-drain - allows wired-OR configuration and interface with bidirectional µP reset pins (e.g., 68HC11). |
| Input Threshold (RST IN1/RST IN2) | 1.23V ±0.03V - stable internal reference enabling accurate external resistor-divider threshold programming. |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade embedded control and computing environments. |
Pinout & Package
Package: SOT23-5, surface-mount, RoHS-compliant, tape-and-reel delivery.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low open-drain reset output | Drives low to assert system reset; requires external pull-up; valid down to VCC = 1V. |
| 2 - GND | System ground reference | Return path for all internal comparators and output stage; must be low-impedance. |
| 3 - RST IN1 | Adjustable undervoltage reset input #1 | Compares external voltage divider output to 1.23V reference; asserts reset if input falls below threshold. |
| 4 - RST IN2 | Adjustable undervoltage reset input #2 | Independent second undervoltage monitor; identical electrical behavior to RST IN1. |
| 5 - VCC | Primary power supply input | Powers internal circuitry; not monitored for reset (unlike MAX6306–MAX6313); must be ≥1.0V for RESET validity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent undervoltage inputs | Enables simultaneous monitoring of two separate rails (e.g., 3.3V and 5V) using single IC and two resistor dividers. |
| No internal VCC monitoring | Eliminates fixed-threshold dependency on main supply; allows flexible rail assignment and avoids false triggers from VCC noise. |
| Guaranteed RESET validity to VCC = 1V | Ensures deterministic reset state during deep brownout, critical for nonvolatile memory write integrity and safe shutdown. |
| Immunity to short VCC transients | Rejects glitches ≤200µs (at 2.5V overdrive), preventing spurious resets in electrically noisy environments. |
| Factory-trimmed 2.5V threshold with ±1.5% accuracy | Reduces BOM count and calibration effort versus discrete supervisor solutions requiring external precision references. |
Applications
| Industrial PLC I/O Module | Portable Medical Monitor |
|---|---|
Use Scenario: Monitors both 3.3V logic rail and 5V analog sensor supply in a battery-powered patient monitor with isolated data acquisition. IC Role / Device Role / Timing Role: Dual-rail undervoltage supervisor asserting open-drain RESET to ARM Cortex-M4 MCU upon either rail dropping below programmed threshold. Use Value: Prevents corrupted ECG waveform capture during partial battery depletion by holding MCU in reset until both supplies stabilize post-wake. |
Use Scenario: Ensures reliable boot sequence in a handheld pulse oximeter with separate 3.3V digital core and 2.8V LED driver supply. IC Role / Device Role / Timing Role: Configured with RST IN1 monitoring 3.3V rail and RST IN2 monitoring 2.8V rail; asserts RESET until both exceed 2.5V × (R1+R2)/R2 thresholds. Use Value: Eliminates firmware lockup during cold-start by guaranteeing 140ms minimum reset hold time after dual-rail stabilization. |
| Network Edge Router Control Card | Smart Energy Meter MCU Subsystem |
Use Scenario: Supervises redundant 5V and 3.3V power domains on a carrier board hosting FPGA and communication SoC. IC Role / Device Role / Timing Role: Provides fail-safe reset coordination between two independent power supplies feeding different functional blocks. Use Value: Avoids metastability in cross-domain signaling by ensuring synchronous release of both processor and FPGA reset lines after full power convergence. |
Use Scenario: Monitors backup supercapacitor (2.7V) and main 3.3V rail in a DIN-rail meter during AC mains interruption. IC Role / Device Role / Timing Role: Uses RST IN1 for 3.3V rail and RST IN2 for supercap voltage divider; triggers reset before EEPROM write corruption occurs. Use Value: Enables safe power-fail data logging by asserting reset early enough to complete last-valid measurement storage before VCC drops below 1.0V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-input undervoltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6308UK00D3-T | Same pinout and dual-RST-IN architecture, but push/pull (not open-drain) RESET output; higher ICC (16µA max). | Requires no external pull-up; unsuitable for wired-OR or bidirectional µP reset interfaces. | Select when driving CMOS inputs directly and layout space prohibits pull-up resistor placement. |
| TLV809E25DBZR | Single-input, fixed 2.5V reset IC in SOT23-3; no RST IN2; 1.6µA ICC; 200ms timeout. | Lacks dual-rail capability; cannot replace MAX6305UK00D3-T without redesigning supervision topology. | Use only for single-rail cost-sensitive applications where second monitor is unnecessary. |
Compared with MAX6308UK00D3-T and TLV809E25DBZR, the MAX6305UK00D3-T uniquely delivers dual independent undervoltage monitoring in open-drain configuration with minimal quiescent current-enabling robust, flexible reset coordination across heterogeneous power domains without additional components.
Availability
The MAX6305UK00D3-T is available at Aetrix Electronics and suitable for industrial PLCs, portable medical devices, network edge hardware, and smart energy meters requiring stable component supply, long-term lifecycle support, and guaranteed commercial-temperature performance.
Supply support for MAX6305UK00D3-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 power management, sensing, and interface applications in industrial, computing, and communications markets.
The MAX6305–MAX6313 family was engineered specifically for multivoltage microprocessor supervisory tasks-emphasizing low power, transient immunity, and flexible threshold programming via external resistors rather than fixed internal monitoring.
FAQ
What is the factory-programmed reset threshold of the MAX6305UK00D3-T?
The MAX6305UK00D3-T has a factory-programmed VCC reset threshold of 2.5V nominal, with ±1.5% tolerance at +25°C and ±2.5% over the full 0°C to +70°C operating range. This threshold applies to the internal comparator reference used for RST IN1 and RST IN2 inputs, not to VCC itself-VCC is powered only and not monitored.
Does the MAX6305UK00D3-T include a manual reset (MR) input?
No, the MAX6305UK00D3-T does not feature a manual reset input. It belongs to the MAX6305/MAX6308/MAX6311 subgroup, which provides two adjustable undervoltage inputs (RST IN1 and RST IN2) but omits MR, OVRST IN, and internal VCC monitoring. Manual reset capability requires selecting a MAX6306/MAX6309/MAX6312 variant instead.
What is the meaning of "D3" in the MAX6305UK00D3-T part number?
In the MAX6305UK00D3-T, "D3" designates the factory-programmed reset timeout period: D3 = 140ms minimum. This value is fixed at manufacture and determines how long the RESET signal remains asserted after all monitored supplies exceed their thresholds. Other options are D1 (1ms), D2 (20ms), and D4 (1120ms).
Can the MAX6305UK00D3-T monitor a 5V supply directly?
Yes-the MAX6305UK00D3-T can monitor a 5V supply by connecting it to either RST IN1 or RST IN2 through an external resistor divider that scales the 5V down to ≤1.23V. For example, using R1 = 309kΩ and R2 = 100kΩ yields VRSTIN ≈ 1.23V at VIN = 5.0V, triggering reset if VIN falls below ~4.92V. VCC pin supplies power only and is not monitored.
Is the MAX6305UK00D3-T compatible with lead-free soldering processes?
Yes, the MAX6305UK00D3-T is available in lead-free packaging. The "-T" suffix denotes standard leaded packaging; to specify lead-free, replace "-T" with "+T" per Maxim's ordering convention (e.g., MAX6305UK00D3+T). Lead-free reflow peak temperature is rated at +260°C per JEDEC J-STD-020.
MAX6305UK00D3-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- Adjustable/Selectable
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6305UK00D3-T FAQ
1.How can I place an order for MAX6305UK00D3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6305UK00D3-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 MAX6305UK00D3-T reliable?
The price and inventory of MAX6305UK00D3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6305UK00D3-T is usually 5 days.
3.What payment methods are accepted for MAX6305UK00D3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6305UK00D3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6305UK00D3-T?
MAX6305UK00D3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6305UK00D3-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 MAX6305UK00D3-T?
For technical support, including MAX6305UK00D3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6305UK00D3-T requirements.
6.How does Aetrix verify that MAX6305UK00D3-T is sourced from the original manufacturer or authorized distributors?
All MAX6305UK00D3-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 MAX6305UK00D3-T meets industry standards.
7.What is the process for return or replacement of MAX6305UK00D3-T?
All MAX6305UK00D3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6305UK00D3-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 MAX6305UK00D3-T part is unused and in its original packaging.
Return procedure for MAX6305UK00D3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6305UK00D3-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…
