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Analog Devices Inc./Maxim Integrated MAX6346UR38-T
- Part No.:
- MAX6346UR38-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6346UR38-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,275
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Product details
Overview
MAX6346UR38-T from Maxim Integrated is a precision active-low push-pull microprocessor supervisory circuit designed to monitor 3.3V/5V power rails in embedded systems. It asserts reset when VCC falls below 3.800V (±2.5% over temperature), maintains reset for ≥100ms after VCC recovery, draws ≤1.0µA supply current at 3.2V, and operates from -40°C to +85°C in SOT23-3 package - used in battery-powered controllers and critical µP power monitoring.
For engineers reviewing the MAX6346UR38-T datasheet, MAX6346UR38-T pinout, MAX6346UR38-T application, or MAX6346UR38-T equivalent, this page delivers verified reset threshold accuracy, push-pull output drive capability, transient immunity specs, and direct replacement guidance for industrial µP reset design.
Technical Context
The MAX6346UR38-T implements a factory-trimmed bandgap-based voltage comparator with 9.5mV hysteresis and 40ppm/°C tempco to ensure stable reset assertion across temperature. Its internal reset timer guarantees minimum 100ms timeout after VCC exceeds 3.800V, independent of supply ramp rate.
This device uses a push-pull output stage capable of sourcing 500µA at 0.8·VCC and sinking 1.6mA at ≤0.3V, eliminating external pull-up resistors. It ignores transients <100µs wide at VCC = VTH − 100mV, per Maxim's Typical Operating Characteristics graphs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.800V ±2.5% over -40°C to +85°C - ensures reliable brownout detection on 3.3V/5V rails |
| Supply Current | ≤1.0µA at 3.2V - enables multi-year operation in coin-cell–powered devices |
| Reset Timeout | 100ms to 280ms - meets JEDEC JESD78 latch-up immunity requirements |
| Output Type | Active-low push-pull - drives reset lines directly without external components |
| VCC Range | 1.2V to 5.5V - supports operation down to near-dead-battery conditions |
| Reset Hysteresis | 9.5mV - prevents chatter during slow VCC recovery near threshold |
| Tempco | 40ppm/°C - limits threshold drift to ±19mV over full temperature range |
Pinout & Package
MAX6346UR38-T is housed in a 3-pin SOT23-3 package (outline 21-0051) with 0.95mm pitch, 2.9mm × 1.6mm footprint, and thermal pad omitted - compatible with standard reflow profiles for leaded and lead-free assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output stage |
| 2 | RESET | Active-low push-pull output - sinks 1.6mA or sources 500µA; no external pull-up required |
| 3 | VCC | Power input - supplies internal circuitry and defines reset threshold reference |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 1.0µA max enables >10-year shelf life in battery-backed systems |
| Factory-trimmed VTH | 3.800V ±1.5% at +25°C ensures single-part qualification across production lots |
| Transient immunity | Rejects VCC glitches <100µs wide at 100mV overdrive - eliminates false resets |
| No external components | Integrated reset timer and push-pull driver eliminate R/C networks and pull-ups |
| Wide VCC range | Operates down to 1.2V - supports reset assertion during deep brownout |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
Use Scenario: Power sequencing and fault recovery in DIN-rail mounted programmable logic controllers with dual 24V/5V rails. IC Role / Device Role / Timing Role: Supervises 5V logic rail and triggers hard reset on brownout, holding µP in reset ≥100ms for clean restart. Use Value: Prevents firmware corruption during factory floor voltage sags by guaranteeing minimum reset pulse width independent of VCC ramp rate. |
Use Scenario: Battery-powered ECG and SpO₂ monitors requiring multi-year operation on CR2032 cells. IC Role / Device Role / Timing Role: Monitors 3.3V LDO output and asserts reset before battery drops below 2.8V, enabling graceful shutdown. Use Value: 1.0µA quiescent current extends usable battery life by >15% versus 5µA alternatives, while 3.8V threshold aligns with LiMnO₂ discharge curve. |
| Smart Energy Meters | Automotive Body Control Modules |
Use Scenario: ANSI C12.1-compliant electricity meters exposed to grid surges and dips. IC Role / Device Role / Timing Role: Resets metering SoC during AC line dropouts, using push-pull output to drive isolated reset optocoupler input. Use Value: 9.5mV hysteresis prevents oscillatory reset during marginal 3.3V rail recovery, ensuring single deterministic reset event. |
Use Scenario: 12V-to-3.3V powered BCMs in passenger compartments with high EMI exposure. IC Role / Device Role / Timing Role: Supervises post-regulator 3.3V rail and asserts reset on load-dump-induced dips below 3.8V. Use Value: Immunity to 100µs transients eliminates false resets from alternator noise, improving ASIL-B compliance confidence. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3-T | 3.08V reset threshold, same SOT23-3 package, 1.5µA ICC | Designed for 3.3V systems with tighter tolerance (±2.0%) but shorter 140ms max timeout | Select when system brownout threshold must be lower than 3.8V and higher ICC is acceptable |
| TPS3808G33DBVR | 3.3V threshold, 2.5µA ICC, open-drain output, requires external pull-up | Offers adjustable delay via capacitor, but lacks push-pull drive and has 2× higher supply current | Choose only if design requires programmable reset timeout or I²C-compatible reset sharing |
Compared with MAX6346UR38-T, MAX809TRD3-T provides lower threshold and tighter tolerance but sacrifices ultra-low ICC and longer timeout; TPS3808G33DBVR adds flexibility at cost of higher current and external component dependency.
Availability
MAX6346UR38-T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, smart energy meters, automotive body control modules, and battery-powered instrumentation requiring stable component supply and long-term lifecycle support.
Supply support for MAX6346UR38-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 industrial, computing, and communications markets, with emphasis on power management and reliability-critical functions.
The MAX63xx family targets cost-sensitive, space-constrained µP reset applications where ultra-low ICC, guaranteed timeout, and factory-trimmed thresholds eliminate calibration and reduce BOM count.
FAQ
What is the exact reset threshold voltage of MAX6346UR38-T and how does it vary with temperature?
The MAX6346UR38-T has a nominal reset threshold of 3.800V at +25°C, with ±1.5% variation at room temperature and ±2.5% over the full -40°C to +85°C operating range. Its 40ppm/°C tempco results in maximum drift of ±19mV across temperature, confirmed in the Electrical Characteristics table under VTH specifications.
Does MAX6346UR38-T require an external pull-up resistor on its RESET pin?
No, MAX6346UR38-T features a push-pull output stage that actively drives both high and low states, eliminating the need for an external pull-up resistor. The datasheet specifies VOH = 0.8·VCC when sourcing 500µA and VOL ≤ 0.3V when sinking 1.6mA - fully compliant with TTL and CMOS reset inputs.
What is the minimum VCC voltage at which MAX6346UR38-T guarantees correct reset state?
MAX6346UR38-T guarantees correct reset assertion and deassertion down to VCC = 1.2V over the full -40°C to +85°C temperature range. This is specified in the Absolute Maximum Ratings and Electrical Characteristics tables, enabling use in deep brownout scenarios where other supervisors fail.
How does MAX6346UR38-T handle fast transients on the VCC supply line?
MAX6346UR38-T ignores negative-going VCC transients shorter than 100µs when the overdrive (VTH − VCC) is 100mV, as shown in Figure 4 of the datasheet. Its internal comparator architecture filters such glitches to prevent false resets, a key requirement for noisy industrial power environments.
Is MAX6346UR38-T pin-compatible with legacy Maxim reset ICs like MAX809?
MAX6346UR38-T shares the same SOT23-3 pinout (GND, RESET, VCC) and footprint as MAX809 series devices, but differs in reset threshold (3.800V vs. 3.08V) and output drive strength. While physically mountable, functional substitution requires validation of threshold alignment and timing requirements in the target system.
MAX6346UR38-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.8V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MAX6346UR38-T FAQ
1.How can I place an order for MAX6346UR38-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6346UR38-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 MAX6346UR38-T reliable?
The price and inventory of MAX6346UR38-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6346UR38-T is usually 5 days.
3.What payment methods are accepted for MAX6346UR38-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6346UR38-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6346UR38-T?
MAX6346UR38-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6346UR38-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 MAX6346UR38-T?
For technical support, including MAX6346UR38-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6346UR38-T requirements.
6.How does Aetrix verify that MAX6346UR38-T is sourced from the original manufacturer or authorized distributors?
All MAX6346UR38-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 MAX6346UR38-T meets industry standards.
7.What is the process for return or replacement of MAX6346UR38-T?
All MAX6346UR38-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6346UR38-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 MAX6346UR38-T part is unused and in its original packaging.
Return procedure for MAX6346UR38-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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