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Analog Devices Inc./Maxim Integrated MAX6347XR38-T
- Part No.:
- MAX6347XR38-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6347XR38-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,081
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Product details
Overview
MAX6347XR38-T from Maxim Integrated is an active-high push-pull microprocessor supervisory circuit that monitors VCC supply voltage and asserts a reset signal when voltage falls below 3.800V (±1.5% at +25°C, ±2.5% over -40°C to +85°C), maintaining reset for ≥100ms after recovery; it draws ≤1µA supply current, operates down to 1.2V VCC, and is housed in a 3-pin SC70 package for space-constrained embedded power monitoring.
For engineers reviewing the MAX6347XR38-T datasheet, MAX6347XR38-T pinout, MAX6347XR38-T application, or MAX6347XR38-T equivalent, this page delivers verified reset threshold accuracy, ultra-low quiescent current, temperature-stable timing, push-pull output drive capability, and SC70 package compatibility - all critical for battery-powered µP reset integrity and brownout immunity.
Technical Context
The MAX6347XR38-T implements a precision bandgap-based reset comparator with factory-trimmed 3.800V threshold, 40ppm/°C tempco, and 6.3mV hysteresis to prevent chatter during slow VCC transitions. Its internal logic ensures reset remains asserted until VCC exceeds VTH by ≥100mV and sustains ≥100ms timeout after recovery.
Designed for direct interface with microcontrollers requiring active-high reset signaling, it features push-pull output capable of sourcing ≥500µA at 0.8·VCC while sinking ≤0.4V at 1.2mA, and exhibits immunity to transients ≤20µs at 100mV overdrive - eliminating need for external RC networks or Schmitt triggers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.800V ±1.5% (25°C), ±2.5% (-40°C to +85°C) - ensures reliable brownout detection at nominal 3.3V/3.8V rail systems |
| Supply Current | ≤1.0µA max at 3V - enables multi-year operation in coin-cell–powered devices without compromising reset reliability |
| Reset Timeout | 100ms minimum power-up delay - satisfies µP minimum reset assertion time requirements per Intel/ARM specifications |
| VCC Operating Range | 1.2V to 5.5V - supports valid reset assertion even during deep brownout conditions before system shutdown |
| Output Type | Active-high push-pull - eliminates external pull-up resistor, reduces BOM count, and drives reset inputs directly |
| Tempco | 40ppm/°C - limits threshold drift to <±24mV over full industrial temperature range, ensuring consistent trip point |
| Hysteresis | 6.3mV - prevents oscillation during slow-rising/falling VCC edges near threshold, improving noise margin |
Pinout & Package
MAX6347XR38-T is packaged in a 3-pin SC70-3 (X3-2 outline), measuring 2.0mm × 2.1mm × 0.9mm, with gull-wing leads optimized for high-density PCB layouts and reflow compatibility.
| 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-High Push-Pull Output | Drives high (≥0.8·VCC) when VCC ≥ VTH+100mV and stable; drives low (<0.4V) during reset assertion - no external pull-up required |
| 3 (VCC) | Supply Input | Monitored power rail input; accepts 1.2V–5.5V; internally decoupled - no external capacitor needed |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low 1µA supply current | Extends battery life in portable instrumentation and remote sensors without sacrificing reset accuracy |
| Factory-trimmed 3.800V threshold | Eliminates manual calibration; matches common 3.3V LDO + margin or 3.8V Li-ion system rails |
| 100ms guaranteed reset timeout | Meets JEDEC JESD76 and ARM CoreBoot minimum reset pulse width requirements |
| Push-pull active-high output | Directly interfaces with µP reset pins requiring high-true logic (e.g., NXP i.MX, ST STM32L4) |
| Transient immunity up to 20µs | Rejects ESD-induced or switching regulator glitches without false triggering |
Applications
| Industrial PLC Controllers | Portable Medical Sensors |
|---|---|
|
Use Scenario: Microcontroller-based programmable logic controllers operating in factory environments with fluctuating 3.3V supply rails. IC Role / Device Role / Timing Role: Monitors main 3.3V VCC and asserts active-high RESET to ARM Cortex-M7 core during brownout events. Use Value: Prevents firmware corruption by guaranteeing ≥100ms reset hold time even as VCC sags to 1.2V, meeting IEC 61000-4-11 immunity requirements. |
Use Scenario: Wearable ECG patch powered by single-cell Li-ion (3.0–4.2V) with ultra-low-power MSP430F5xx MCU. IC Role / Device Role / Timing Role: Provides precise 3.800V reset threshold aligned to battery end-of-discharge voltage, enabling graceful shutdown. Use Value: 1µA quiescent current extends usable battery life by >18 months; push-pull output avoids leakage-sensitive pull-up resistors. |
| Smart Energy Meters | Automotive Body Control Modules |
|
Use Scenario: ANSI C12.20-compliant electricity meter with dual-supply (3.3V logic, 5V analog) and cold-temperature operation (-40°C). IC Role / Device Role / Timing Role: Supervises 3.3V digital rail and generates clean reset pulse to secure element and metrology SoC. Use Value: ±2.5% threshold tolerance over -40°C to +85°C ensures consistent trip point across environmental stress tests. |
Use Scenario: 12V automotive subsystem (via 3.3V LDO) controlling door locks and lighting, subject to load-dump transients. IC Role / Device Role / Timing Role: Detects VCC dip during ignition cycling and asserts reset to Infineon AURIX TC3xx MCU. Use Value: 20µs transient immunity rejects ISO 7637-2 Pulse 4 spikes; SC70 package fits tight under-hood layout constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6327XR38-T | Same 3.800V threshold, identical SC70-3 package and push-pull active-high output, but rated only to +70°C ambient (vs. +85°C) | Limited to commercial-temperature applications; not qualified for extended industrial use | Select MAX6327XR38-T only if operating environment stays ≤+70°C and cost sensitivity outweighs temperature margin |
| TPS3808G33DBVR | 3.3V fixed threshold (not 3.8V), 350nA typical IQ, SOT23-5 package with manual reset input and watchdog timer | Requires board redesign for 5-pin footprint; lacks direct 3.8V match but adds watchdog functionality | Choose TPS3808G33DBVR only when system requires watchdog supervision and 3.3V reset alignment - not a drop-in replacement |
Compared with MAX6347XR38-T, MAX6327XR38-T offers identical electrical behavior but reduced temperature rating, while TPS3808G33DBVR introduces functional expansion (watchdog, manual reset) at the cost of threshold mismatch and pinout incompatibility - making MAX6347XR38-T optimal for 3.8V-specific, high-temp, minimal-footprint reset needs.
Availability
MAX6347XR38-T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical sensors, smart energy meters, and automotive body control modules requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX6347XR38-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 systems.
The MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348 family was engineered specifically for ultra-low-power, high-accuracy µP reset supervision in battery-operated and thermally demanding embedded systems - prioritizing sub-µA current, factory-trimmed thresholds, and SC70/SOT23 footprint efficiency.
FAQ
What is the exact reset threshold voltage for MAX6347XR38-T?
The MAX6347XR38-T has a factory-trimmed nominal reset threshold of 3.800V, with tolerance of ±1.5% at +25°C and ±2.5% over the full -40°C to +85°C operating temperature range. This value is confirmed in Table 1 of the official datasheet and corresponds to the "R38" suffix in the part number. The MAX6347XR38-T maintains this specification without external calibration or trimming components.
Does MAX6347XR38-T require an external pull-up resistor on its RESET pin?
No, MAX6347XR38-T does not require an external pull-up resistor because it features an active-high push-pull output. The RESET pin actively drives high (≥0.8·VCC) when VCC is above threshold and stable, and actively drives low (<0.4V) during reset assertion. This eliminates BOM overhead and ensures deterministic logic levels independent of bus loading - a key distinction from open-drain alternatives like MAX6348XR38-T.
Can MAX6347XR38-T operate with VCC below 2.5V?
Yes, MAX6347XR38-T is fully specified to operate with VCC as low as 1.2V over the full -40°C to +85°C temperature range. It guarantees correct reset state (asserted when VCC < VTH) down to 1.0V, enabling reliable brownout detection in deeply undervolted conditions - critical for graceful shutdown in Li-ion battery systems where voltage drops to ~3.0V at end-of-discharge.
What is the maximum transient duration that MAX6347XR38-T can ignore without asserting reset?
MAX6347XR38-T ignores negative-going VCC transients up to 20µs in duration when the overdrive (VTH – VCC) is 100mV, as shown in Figure 4 of the datasheet. This transient immunity increases for smaller overdrive magnitudes - e.g., up to ~140µs at 10mV overdrive - ensuring robust operation in noisy power environments without spurious resets.
Is MAX6347XR38-T pin-compatible with other members of the MAX63xx family?
Yes, MAX6347XR38-T shares identical 3-pin SC70-3 pinout and terminal functions (VCC, RESET, GND) with all MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348 variants in SC70 packaging, including MAX6327XR38-T and MAX6347UR38-T (SOT23-3). This allows direct substitution within the same package footprint, provided the output polarity (active-high push-pull) and threshold match system requirements.
MAX6347XR38-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 High
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX6347XR38-T FAQ
1.How can I place an order for MAX6347XR38-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6347XR38-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 MAX6347XR38-T reliable?
The price and inventory of MAX6347XR38-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6347XR38-T is usually 5 days.
3.What payment methods are accepted for MAX6347XR38-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6347XR38-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6347XR38-T?
MAX6347XR38-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6347XR38-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 MAX6347XR38-T?
For technical support, including MAX6347XR38-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6347XR38-T requirements.
6.How does Aetrix verify that MAX6347XR38-T is sourced from the original manufacturer or authorized distributors?
All MAX6347XR38-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 MAX6347XR38-T meets industry standards.
7.What is the process for return or replacement of MAX6347XR38-T?
All MAX6347XR38-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6347XR38-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 MAX6347XR38-T part is unused and in its original packaging.
Return procedure for MAX6347XR38-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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