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Analog Devices Inc./Maxim Integrated MAX6346XR38-T
- Part No.:
- MAX6346XR38-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6346XR38-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,436
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Product details
Overview
MAX6346XR38-T from Maxim Integrated is a precision active-low push-pull microprocessor supervisory circuit designed to monitor 3.8V power supplies and assert reset during brownout, power-up, and power-down events. It features a factory-trimmed 3.800V reset threshold (±1.5% at +25°C, ±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 MAX6346XR38-T datasheet, MAX6346XR38-T pinout, MAX6346XR38-T application, or MAX6346XR38-T equivalent, this page delivers verified specifications, SC70-3 package details, reset timing behavior, voltage monitoring accuracy, and validated alternative options for µP reset supervision in space-constrained embedded designs.
Technical Context
The MAX6346XR38-T implements a precision bandgap-based reset comparator with 40ppm/°C tempco and 9.5mV hysteresis, ensuring stable threshold detection across temperature. Its push-pull output drives RESET low actively (VOL ≤ 0.3V at 1.6mA) and high actively (VOH ≥ 0.8·VCC), eliminating external pull-up components.
It guarantees correct reset state for VCC as low as 1.2V and ignores fast transients via internal filtering - maximum glitch rejection is 200µs at 100mV overdrive. The device asserts reset for ≥100ms after VCC rises above 3.800V and holds reset asserted while VCC remains below threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.800V ±1.5% (25°C), ±2.5% (-40°C to +85°C); ensures accurate brownout detection for 3.8V nominal rails |
| Supply Current | ≤1.0µA (max) at 3.2V; enables multi-year battery life in always-on portable devices |
| Reset Timeout | 100ms (min) power-up delay; meets JEDEC JESD74A requirement for reliable µP initialization |
| Output Type | Active-low push-pull; drives RESET directly without external pull-up, simplifying PCB layout |
| VCC Operating Range | 1.2V to 5.5V; supports operation during deep brownout and full rail conditions |
| Reset Hysteresis | 9.5mV; prevents chatter near threshold during slow-rising/falling VCC transitions |
| Tempco | 40ppm/°C; maintains threshold stability across industrial temperature range |
Pinout & Package
MAX6346XR38-T is housed in a 3-pin SC70-3 package (outline X3-2), measuring 2.0mm × 2.1mm × 0.95mm, compatible with high-density SMT assembly and reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal comparator and output driver; must be low-impedance to ensure reset accuracy |
| 2 (RESET) | Active-low push-pull reset output | Drives low (≤0.3V @ 1.6mA) during fault; drives high (≥0.8·VCC) otherwise; interfaces directly with µP reset input |
| 3 (VCC) | Supply voltage input | Monitored rail input; powers internal circuitry and defines reset assertion level; accepts 1.2V–5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1µA max enables >10-year battery life in coin-cell–powered IoT sensors and wearables |
| Precision factory-trimmed threshold | 3.800V ±1.5% eliminates need for external calibration or trimming resistors |
| Push-pull output architecture | Removes dependency on external pull-up resistor, reducing BOM count and board area |
| Brownout transient immunity | Rejects VCC glitches up to 200µs duration at 100mV overdrive, preventing false resets |
| Full temperature specification | Guaranteed performance from -40°C to +85°C supports industrial and automotive under-hood applications |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Wearable ECG patch operating from CR2032 coin cell with intermittent BLE transmission. IC Role / Device Role / Timing Role: Monitors 3.8V regulated rail and asserts reset if voltage sags below 3.8V during RF burst, ensuring clean µC restart. Use Value: 1µA supply current extends battery life beyond 24 months; 100ms timeout prevents spurious wakeups during brief load transients. |
Use Scenario: DIN-rail mounted analog input module exposed to 40–85°C ambient and 12–24V DC field power. IC Role / Device Role / Timing Role: Supervises local 3.8V LDO output powering ARM Cortex-M4 core; asserts reset on undervoltage or cold start. Use Value: ±2.5% threshold tolerance over full temperature range ensures deterministic reset across operating envelope; SC70-3 footprint saves space on dense I/O carrier PCB. |
| Smart Meter Data Loggers | Automotive Body Control Units |
|
Use Scenario: Battery-backed AMI meter storing consumption data during grid outages. IC Role / Device Role / Timing Role: Resets metering SoC when backup LiSOCl₂ cell drops below 3.8V, preventing corrupted flash writes. Use Value: 9.5mV hysteresis avoids oscillation during gradual battery discharge; 1.2V VCC min allows supervision until final cell depletion. |
Use Scenario: Low-power door module with CAN transceiver and wake-on-LIN capability. IC Role / Device Role / Timing Role: Provides clean power-on reset to microcontroller after ignition cycle; immune to alternator ripple-induced VCC dips. Use Value: Transient immunity rejects 100mV/200µs spikes common in automotive 12V systems; push-pull output ensures fast, low-impedance reset assertion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR38-T | Same 3.8V threshold, identical SC70-3 package and push-pull output, but rated for 1.0V–5.5V VCC (vs. 1.2V–5.5V for MAX6346XR38-T); 0.5µA typical ICC vs. 1.0µA max for MAX6346XR38-T | Preferred where sub-1.2V brownout detection is required or ultra-minimal current draw is critical | Select MAX6326XR38-T only if operation below 1.2V VCC is needed; otherwise MAX6346XR38-T offers tighter production-tested max ICC guarantee |
| TLV803EB38DBZR | 3.8V threshold, open-drain output, SOT23-3 package, 0.5µA typical ICC; lacks push-pull drive and requires external pull-up | Suitable for systems already using pull-up networks or where bidirectional reset pins are present | Choose TLV803EB38DBZR only if open-drain interface is required; MAX6346XR38-T eliminates pull-up component and provides stronger high-side drive |
Compared with MAX6326XR38-T, MAX6346XR38-T trades marginal VCC lower limit (1.2V vs. 1.0V) for guaranteed 1µA max ICC and production-tested industrial temp range compliance; versus TLV803EB38DBZR, it delivers integrated push-pull drive, saving one passive component and improving noise margin on RESET line.
Availability
MAX6346XR38-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and smart meter data loggers requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX6346XR38-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, sensing, and interface applications, with emphasis on high reliability and low power.
The MAX6346 series belongs to Maxim's ultra-low-power µP supervisory product line, engineered specifically for battery-critical and space-constrained embedded systems needing accurate, glitch-immune reset generation without external components.
FAQ
What is the exact reset threshold voltage of MAX6346XR38-T and how tightly is it specified?
The MAX6346XR38-T has a factory-trimmed nominal reset threshold of 3.800V, guaranteed within ±1.5% at +25°C and ±2.5% over the full -40°C to +85°C operating temperature range. This specification is confirmed in the Electrical Characteristics table of the official datasheet and applies directly to the MAX6346XR38-T variant, not the broader family. The 9.5mV hysteresis further stabilizes transition behavior near the threshold.
Does MAX6346XR38-T support operation below 2.5V VCC, and what is its minimum functional supply voltage?
Yes, MAX6346XR38-T operates down to 1.2V VCC across the full -40°C to +85°C temperature range, and is guaranteed to maintain correct reset state (i.e., assert RESET when VCC < 3.8V) at that level. The datasheet explicitly states "VCC Range: 1.2V to 5.5V (TA = -40°C to +85°C)" for MAX6346 variants, confirming functionality well below standard logic rails.
Is MAX6346XR38-T pin-compatible with MAX809 or other legacy supervisors?
No - MAX6346XR38-T is not pin-compatible with MAX809. While both are 3-pin reset supervisors, MAX809 uses SOT23-3 with pinout GND–VCC–RESET, whereas MAX6346XR38-T (in SC70-3) uses GND–RESET–VCC. The pin order differs, and SC70-3 has smaller pad pitch than SOT23-3. Direct replacement would require PCB redesign.
What is the maximum transient duration that MAX6346XR38-T can ignore without asserting reset?
At a 100mV overdrive (i.e., VCC dipping 100mV below 3.800V threshold), MAX6346XR38-T can ignore transients up to 200µs in duration without issuing a reset pulse. This value is plotted in Figure 4 ("Maximum Transient Duration vs. Reset Threshold Overdrive") of the datasheet and is measured on SC70-packaged units like MAX6346XR38-T.
Does MAX6346XR38-T require any external components for basic reset functionality?
No, MAX6346XR38-T requires zero external components for core reset supervision. Its push-pull output drives RESET actively high and low, eliminating the need for an external pull-up resistor. No capacitors, resistors, or trimming elements are needed - only VCC, GND, and connection to the µP RESET pin.
MAX6346XR38-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:
- 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:
- SC-70-3
MAX6346XR38-T FAQ
1.How can I place an order for MAX6346XR38-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6346XR38-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 MAX6346XR38-T reliable?
The price and inventory of MAX6346XR38-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6346XR38-T is usually 5 days.
3.What payment methods are accepted for MAX6346XR38-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6346XR38-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6346XR38-T?
MAX6346XR38-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6346XR38-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 MAX6346XR38-T?
For technical support, including MAX6346XR38-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6346XR38-T requirements.
6.How does Aetrix verify that MAX6346XR38-T is sourced from the original manufacturer or authorized distributors?
All MAX6346XR38-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 MAX6346XR38-T meets industry standards.
7.What is the process for return or replacement of MAX6346XR38-T?
All MAX6346XR38-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6346XR38-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 MAX6346XR38-T part is unused and in its original packaging.
Return procedure for MAX6346XR38-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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