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Analog Devices Inc./Maxim Integrated MAX6423XS39+T
- Part No.:
- MAX6423XS39+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6423XS39+T.pdf
- Description:
- IC MPU/RESET CIRC 3.90V SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,343
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Product details
Overview
MAX6423XS39+T from Analog Devices is a low-power microprocessor supervisor IC with open-drain active-low reset output, 3.9V ±2.5% factory-trimmed reset threshold, capacitor-adjustable reset timeout (2.73×10⁶ × CSRT + 275µs), and guaranteed operation down to VCC = 1V. It monitors system supply voltage in portable and automotive embedded controllers requiring precise brownout detection and flexible reset timing.
For engineers reviewing the MAX6423XS39+T datasheet, MAX6423XS39+T pinout, MAX6423XS39+T application, or MAX6423XS39+T equivalent, this page delivers verified electrical parameters, SC70-4 package mapping, real-world use cases for battery-powered systems, and validated alternative parts with documented functional and interface differences.
Technical Context
The MAX6423XS39+T implements a precision voltage detector using laser-trimmed resistors to set its 3.9V reset threshold with ±2.5% accuracy over –40°C to +125°C. Its SRT pin hosts a 240nA constant-current ramp source that charges an external capacitor to generate the reset timeout delay.
Reset assertion occurs when VCC falls below 3.9V; deassertion requires both VCC > 3.9V and the SRT capacitor voltage ramping to 0.65V. The open-drain RESET output supports logic-level translation via external pullup to any supply ≤5.5V and enables wired-OR reset configurations with auxiliary circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.9V ±2.5% - factory-laser-trimmed for stable brownout detection across industrial temperature range |
| Supply Voltage Range | 1.0V to 5.5V - ensures valid reset assertion even during deep brownout conditions |
| Quiescent Current | 1.6µA typ at VCC ≤ 2.0V - enables multi-year battery life in always-on monitoring applications |
| Reset Timeout Formula | tRP = 2.73×10⁶ × CSRT + 275µs - allows precise, application-tailored reset hold time via external capacitor selection |
| RESET Output Type | Active-low open-drain - supports level-shifting, wired-OR reset, and compatibility with diverse µP reset inputs |
| VCC to RESET Delay | 80µs - fast response to supply droop prevents erroneous code execution during transient faults |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial control environments |
Pinout & Package
MAX6423XS39+T is housed in a 4-pin SC70-4 package (package code X4+1, outline 21-0098), measuring 2.0mm × 2.1mm × 0.95mm with 0.65mm pitch. This ultra-small footprint suits space-constrained portable and wearable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Supply input and reset threshold reference - must be decoupled locally; valid operation guaranteed down to 1.0V |
| 2 | GND | Analog ground reference - requires low-impedance connection to minimize noise coupling into SRT and threshold circuitry |
| 3 | RESET | Active-low open-drain output - requires external pullup resistor (10kΩ–100kΩ) to target logic supply; sinks ≥500µA at VCC ≥1.8V |
| 4 | SRT | Set-reset-time input - connects to external timing capacitor; 240nA ramp current source sets timeout period with <10nA leakage requirement |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise tailoring of reset hold time (e.g., 3–6ms with 1500pF) to match specific µP power-up sequencing requirements |
| Guaranteed reset validity to VCC = 1V | Ensures reliable system reset assertion during severe brownout events where other supervisors may fail silently |
| Immunity to short VCC transients | Rejects glitches ≤50µs duration when VCC dips 100mV below threshold - reduces false resets in noisy power environments |
| Open-drain RESET with 5.5V tolerant pullup | Permits interfacing with µPs operating at different supply voltages (e.g., 1.8V core + 3.3V I/O) without level translators |
| Laser-trimmed reset threshold | Delivers ±2.5% accuracy over full temperature range - eliminates need for external calibration in production test |
Applications
| Battery-Powered Medical Sensors | Automotive Body Control Module |
|---|---|
Use Scenario: Continuous glucose monitor powered by coin-cell battery with intermittent BLE transmission. IC Role / Device Role / Timing Role: Voltage supervisor asserting reset during battery sag below 3.9V to prevent corrupted sensor readings or firmware crashes. Use Value: 1.6µA quiescent current extends battery life beyond 2 years; open-drain output interfaces directly to 3.3V BLE SoC reset pin. | Use Scenario: Door module controlling window lift, mirror adjustment, and interior lighting in 12V vehicle electrical system. IC Role / Device Role / Timing Role: Brownout detector triggering controlled µP reset when alternator load dump causes VCC dip below 3.9V. Use Value: –40°C to +125°C rating ensures reliability in under-dash mounting; immunity to 50µs transients prevents spurious resets during relay switching. |
| Industrial Handheld Scanner | Smart Home Hub Power Sequencing |
Use Scenario: Rugged barcode scanner using Li-ion battery and dual-rail power (1.2V core / 3.3V interface). IC Role / Device Role / Timing Role: Supervisor ensuring µP remains held in reset until main 3.3V rail stabilizes post-power-up. Use Value: SC70-4 package saves PCB area; open-drain RESET pulled to 3.3V rail avoids level-shifter components. | Use Scenario: Multi-chip hub with Wi-Fi SoC, Zigbee radio, and USB-C PD controller requiring coordinated power-up timing. IC Role / Device Role / Timing Role: Reset coordinator using adjustable timeout to stagger enable signals across subsystems. Use Value: Capacitor-programmable tRP (e.g., 4.375ms with 1500pF) provides deterministic sequencing without FPGA logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6423US39+T | SOT143-4 package (2.9mm × 1.6mm) vs. SC70-4 (2.0mm × 2.1mm); identical electrical specs and pinout | Requires PCB layout change due to different land pattern and thermal pad absence; same reset behavior and timing | Select MAX6423US39+T only when SOT143 footprint is already established and SC70 board space is constrained |
| NCP302LSN39T1G | Fixed 3.9V threshold but push-pull active-low RESET; no capacitor-adjustable timeout (fixed 200ms) | Cannot support µPs needing custom reset hold times; lacks open-drain flexibility for wired-OR or multi-voltage systems | Choose NCP302LSN39T1G only for cost-sensitive designs where fixed timeout and simpler BOM outweigh flexibility needs |
Compared with MAX6423XS39+T, MAX6423US39+T offers identical functionality in a larger package for easier assembly, while NCP302LSN39T1G trades programmability and interface versatility for lower unit cost and reduced external component count.
Availability
MAX6423XS39+T is available at Aetrix Electronics and suitable for battery-powered medical sensors, automotive body control modules, industrial handheld scanners, and smart home hub power sequencing requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6423XS39+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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The MAX6421–MAX6426 family was designed specifically for ultra-low-power, precision voltage monitoring in space- and energy-constrained embedded systems where reliable brownout detection and flexible reset timing are critical.
FAQ
What is the exact reset threshold voltage of the MAX6423XS39+T and how accurate is it over temperature?
The MAX6423XS39+T has a nominal reset threshold of 3.9V, trimmed at the factory with ±1.5% accuracy at +25°C and ±2.5% over the full –40°C to +125°C operating range. This specification is confirmed in the Electrical Characteristics table of the official Analog Devices datasheet (Rev 11, p.2), where VTH min/max values are listed as 3.803V/3.998V at TA = –40°C to +125°C.
Can the MAX6423XS39+T operate reliably when the supply voltage drops below 1.6V?
Yes - the MAX6423XS39+T guarantees valid reset assertion down to VCC = 1.0V, as stated in the Absolute Maximum Ratings and Electrical Characteristics sections. Its internal circuitry remains functional and the open-drain RESET output maintains specified VOL (≤0.3V at ISINK = 500µA) even at 1.0V supply, enabling robust brownout protection in deeply undervolted conditions.
How do I calculate the external capacitor value needed to achieve a 5ms reset timeout with the MAX6423XS39+T?
Use the formula CSRT = (tRP – 275µs) / 2.735×10⁶, where tRP is in seconds. For 5ms (0.005s): CSRT = (0.005 – 0.000275) / 2.735×10⁶ = 1727pF. A standard 1800pF ceramic capacitor (low-leakage, X7R/C0G) yields ~5.2ms timeout, matching typical µP requirements. This calculation is derived directly from the "Selecting a Reset Capacitor" section (p.4) of the MAX6423XS39+T datasheet.
Is the MAX6423XS39+T pin-compatible with any industry-standard alternatives like the NCP302 series?
No - the MAX6423XS39+T uses a 4-pin SC70-4 package with pin 1=VCC, 2=GND, 3=RESET, 4=SRT, whereas NCP302LSN39T1G is a 5-pin SOT23-5 device with different pinout (1=GND, 2=VDD, 3=RESET, 4=N.C., 5=VDD). They are functionally similar voltage supervisors but not pin-compatible; PCB redesign is required for substitution.
Does the MAX6423XS39+T require special PCB layout considerations for the SRT pin?
Yes - the SRT pin connects to a precision 240nA current source, so layout must minimize stray capacitance and leakage. Analog Devices explicitly recommends keeping SRT traces short, routing away from high-speed or high-voltage signals, and avoiding probe contact during testing. These requirements are detailed in the "Layout Consideration" section (p.5) to ensure accurate reset timeout period across temperature and voltage.
MAX6423XS39+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.9V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6423XS39+T FAQ
1.How can I place an order for MAX6423XS39+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6423XS39+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 MAX6423XS39+T reliable?
The price and inventory of MAX6423XS39+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6423XS39+T is usually 5 days.
3.What payment methods are accepted for MAX6423XS39+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6423XS39+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6423XS39+T?
MAX6423XS39+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6423XS39+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 MAX6423XS39+T?
For technical support, including MAX6423XS39+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6423XS39+T requirements.
6.How does Aetrix verify that MAX6423XS39+T is sourced from the original manufacturer or authorized distributors?
All MAX6423XS39+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 MAX6423XS39+T meets industry standards.
7.What is the process for return or replacement of MAX6423XS39+T?
All MAX6423XS39+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6423XS39+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 MAX6423XS39+T part is unused and in its original packaging.
Return procedure for MAX6423XS39+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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