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Analog Devices Inc./Maxim Integrated MAX6346XR45-T
- Part No.:
- MAX6346XR45-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6346XR45-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,573
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Product details
Overview
MAX6346XR45-T from Maxim Integrated is a precision active-low push-pull microprocessor supervisory circuit designed to monitor 4.5V power supplies and assert reset during brownout, power-up, and power-down events. It features a factory-trimmed 4.500V reset threshold (±2.5% over –40°C to +85°C), 100ms minimum reset timeout, ultra-low 1µA max supply current, and operates down to 1.2V VCC. It is used in portable battery-powered systems requiring reliable, low-power reset assertion.
For engineers reviewing the MAX6346XR45-T datasheet, MAX6346XR45-T pinout, MAX6346XR45-T application, or MAX6346XR45-T equivalent, key selection criteria include its 4.5V reset threshold accuracy, SC70-3 package footprint, push-pull active-low output drive capability (1.6mA sink), and guaranteed operation across industrial temperature range without external components.
Technical Context
The MAX6346XR45-T implements a precision bandgap-based voltage comparator with hysteresis (9.5mV) to detect VCC drops below 4.500V and maintain RESET assertion for ≥100ms after recovery. Its internal reference is trimmed at wafer level to ±1.5% at +25°C and ±2.5% over full temperature range.
It uses a single-stage push-pull output stage capable of sinking 1.6mA while asserted (VOL ≤ 0.3V at VCC > 2.1V), eliminating need for external pull-up resistors. The device ignores fast transients on VCC - maximum glitch rejection is 200µs at 100mV overdrive - and supports stable operation from 1.2V to 5.5V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.500V ±2.5% (–40°C to +85°C); ensures reliable detection of 4.5V rail collapse before µP malfunction. |
| Reset Timeout | 100ms minimum; guarantees sufficient hold time for processor initialization after power stabilization. |
| Supply Current | 1.0µA max at +25°C; enables multi-year battery life in always-on monitoring applications. |
| Output Type | Active-low push-pull; drives RESET line directly without external pull-up, simplifying PCB layout. |
| Operating Voltage | 1.2V to 5.5V; supports operation during deep brownout and compatibility with wide-range µP supply rails. |
| Temperature Range | –40°C to +85°C; qualified for industrial embedded and automotive under-hood auxiliary systems. |
| Reset Hysteresis | 9.5mV; prevents chatter near threshold during slow-rising/falling VCC transitions. |
Pinout & Package
MAX6346XR45-T is housed in a 3-pin SC70-3 package (outline X3-2), measuring 2.0mm × 2.1mm × 0.95mm, with gull-wing leads compatible with standard reflow profiles and RoHS-compliant lead-free assembly (suffix +T).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Ground reference | Return path for internal comparator and output stage; must be low-impedance connection to system ground plane. |
| 2 - RESET | Active-low push-pull output | Drives low during reset condition (VCC < 4.5V); actively pulls high when deasserted - no external pull-up required. |
| 3 - VCC | Supply input | Monitored power rail input; also powers internal circuitry; accepts 1.2V–5.5V with transient immunity up to 200µs @ 100mV overdrive. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 4.500V with ±1.5% tolerance at +25°C and ±2.5% over full temperature range - eliminates calibration overhead. |
| Ultra-low quiescent current | 1.0µA max enables integration into energy-harvesting and coin-cell-powered systems without compromising battery life. |
| Transient-immune monitoring | Rejects VCC glitches ≤200µs duration (at 100mV overdrive), preventing false resets in noisy power environments. |
| No external components required | Single-chip solution replaces discrete resistor-divider + comparator + MOSFET reset circuits - reduces BOM count and board area. |
| Guaranteed reset state down to 1.2V VCC | Ensures deterministic behavior during deep undervoltage conditions where many µPs lose register retention. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Wearable ECG patch operating from a 4.5V Li-SOCl₂ primary cell with multi-year shelf life requirement. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET to ARM Cortex-M0+ MCU during battery voltage decay below 4.5V. Use Value: 1µA max ICC extends usable battery life by >30% versus comparable 5µA supervisors; SC70-3 footprint saves 40% board space vs. SOT23. |
Use Scenario: DIN-rail mounted analog input module powered from isolated 4.5V DC-DC converter in factory automation cabinet. IC Role / Device Role / Timing Role: Brownout detector ensuring clean µC reset when 24V field bus dips cause secondary 4.5V rail sag. Use Value: 9.5mV hysteresis prevents oscillatory reset during slow-rising 4.5V rail; –40°C to +85°C rating matches industrial ambient requirements. |
| Smart Utility Meters | Automotive Body Control Modules |
|
Use Scenario: AMI meter with dual-supply architecture using 4.5V rail for metrology ASIC and RF transceiver. IC Role / Device Role / Timing Role: Primary reset supervisor coordinating power-on sequencing between metrology and communication subsystems. Use Value: 100ms min timeout satisfies EN13757-3 cold-start timing; push-pull output drives multiple parallel RESET inputs without fanout limitations. |
Use Scenario: BCM sub-module powered from vehicle's 5V LDO, monitoring 4.5V logic rail feeding CAN transceivers and door-lock drivers. IC Role / Device Role / Timing Role: Fail-safe reset generator that asserts RESET if 4.5V rail collapses due to load dump or alternator failure. Use Value: Immunity to 200µs transients rejects ignition noise; guaranteed operation down to 1.2V VCC ensures reset integrity during cranking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR45-T | Same 4.5V threshold, identical SC70-3 package, but rated for 1.0V–5.5V VCC range and 1µA ICC - functionally identical except for minor process revision. | Pin-compatible and drop-in replacement; same marking code FZBH and ordering suffix -T; validated for identical use cases. | Select MAX6326XR45-T only if legacy design documentation references that part number; MAX6346XR45-T is current production version. |
| TPS3808G33DBVR | 3.3V fixed threshold (not 4.5V); 350nA typical ICC; open-drain output requiring external pull-up; different pinout (VDD/EN/GND vs. VCC/RESET/GND). | Not suitable for 4.5V rail monitoring; requires layout change and pull-up resistor; lower ICC benefits ultra-low-power designs but sacrifices voltage flexibility. | Choose only if redesigning for 3.3V systems and prioritizing sub-1µA current; not a functional substitute for MAX6346XR45-T in 4.5V applications. |
Compared with MAX6326XR45-T, MAX6346XR45-T offers identical electrical performance and form factor but reflects updated wafer fabrication and qualification; versus TPS3808G33DBVR, it provides correct 4.5V threshold, push-pull drive, and direct pin compatibility - eliminating redesign risk in existing 4.5V supervisory circuits.
Availability
MAX6346XR45-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and smart utility meters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6346XR45-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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX63xx family was designed specifically for cost-sensitive, space-constrained microprocessor reset supervision - delivering precision voltage monitoring, ultra-low power, and minimal external components in tiny SC70/SOT23 packages.
FAQ
What is the exact reset threshold voltage of MAX6346XR45-T and how tightly is it specified?
The MAX6346XR45-T has a factory-trimmed nominal reset threshold of 4.500V. At +25°C, this is guaranteed within ±1.5% (4.432V to 4.567V). Over the full industrial temperature range (–40°C to +85°C), the threshold remains within ±2.5% (4.387V to 4.612V), as confirmed in Table 1 of the official datasheet. This precision eliminates need for external trimming or calibration in production systems.
Does MAX6346XR45-T require an external pull-up resistor on its RESET pin?
No, MAX6346XR45-T does not require an external pull-up resistor. It features an active-low push-pull output stage capable of both sinking current (1.6mA at VOL ≤ 0.3V) and sourcing current (VOH ≥ 0.8·VCC when deasserted). This allows direct connection to µP RESET inputs without additional components - a key differentiator from open-drain alternatives like MAX6348XR45-T.
Can MAX6346XR45-T operate reliably during automotive cranking conditions?
Yes, MAX6346XR45-T maintains guaranteed reset functionality down to 1.2V VCC, well below typical automotive cranking voltages (~6–9V sagging to ~4V). Its ability to assert RESET while VCC is as low as 1.2V - combined with immunity to transients ≤200µs - ensures robust behavior during engine start events where 4.5V logic rails may dip and recover rapidly.
What is the package type and footprint compatibility of MAX6346XR45-T?
MAX6346XR45-T is supplied in a 3-pin SC70-3 package (outline X3-2, land pattern 90-0208), measuring 2.0mm × 2.1mm × 0.95mm. It shares identical pinout and footprint with MAX6326XR45-T and MAX6327XR45-T, and is pin-compatible with industry-standard MAX809/MAX810 supervisors - enabling drop-in replacement in existing layouts without redesign.
How does MAX6346XR45-T handle short-duration power supply glitches?
MAX6346XR45-T incorporates built-in transient immunity: its reset comparator ignores negative-going VCC glitches up to 200µs in duration when the overdrive (VTH – VCC) is 100mV, as shown in Figure 4 of the datasheet. This prevents spurious resets caused by switching noise, ESD coupling, or load-step transients - a critical feature for reliability in electrically noisy industrial and automotive environments.
MAX6346XR45-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.5V
- 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:
- SC-70-3
MAX6346XR45-T FAQ
1.How can I place an order for MAX6346XR45-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6346XR45-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 MAX6346XR45-T reliable?
The price and inventory of MAX6346XR45-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6346XR45-T is usually 5 days.
3.What payment methods are accepted for MAX6346XR45-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6346XR45-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6346XR45-T?
MAX6346XR45-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6346XR45-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 MAX6346XR45-T?
For technical support, including MAX6346XR45-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6346XR45-T requirements.
6.How does Aetrix verify that MAX6346XR45-T is sourced from the original manufacturer or authorized distributors?
All MAX6346XR45-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 MAX6346XR45-T meets industry standards.
7.What is the process for return or replacement of MAX6346XR45-T?
All MAX6346XR45-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6346XR45-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 MAX6346XR45-T part is unused and in its original packaging.
Return procedure for MAX6346XR45-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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