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Analog Devices Inc./Maxim Integrated MAX6423US23+T
- Part No.:
- MAX6423US23+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6423US23+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6423US23+T from Analog Devices is a low-power microprocessor supervisor IC with open-drain active-low reset output, 2.313V nominal reset threshold (±2.5% over temperature), capacitor-adjustable reset timeout (275µs to 5.75ms), and guaranteed operation down to VCC = 1V. It monitors supply voltage in portable and battery-powered systems to prevent erroneous µP execution during brownout or power-up.
For engineers reviewing the MAX6423US23+T datasheet, MAX6423US23+T pinout, MAX6423US23+T application, or MAX6423US23+T equivalent, key selection criteria include its 4-pin SOT143 package, 1.6µA typical quiescent current, open-drain RESET compatibility with multiple logic supplies, immunity to short VCC transients, and factory-laser-trimmed reset threshold accuracy.
Technical Context
The MAX6423US23+T implements a precision voltage-detection circuit using laser-trimmed resistors to set its 2.313V reset threshold, with hysteresis of 4 × VTH (≈9.25mV). Its reset timeout is generated by a 240nA internal ramp current charging an external capacitor (CSRT) to a 0.65V internal reference.
It operates across -40°C to +125°C, asserts RESET when VCC falls below threshold, holds RESET low for the timeout period after VCC recovers, and guarantees valid RESET output down to VCC = 1V - enabling reliable supervision in ultra-low-voltage brownout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.313V nominal (±2.5% over -40°C to +125°C); ensures deterministic reset activation at defined supply sag level |
| Quiescent Current | 1.6µA typical at VCC ≤ 2.0V; enables multi-year battery life in always-on monitoring applications |
| Reset Timeout Range | 275µs (CSRT = 0) to 5.75ms (CSRT = 1500pF); supports µP reset timing requirements from fast-boot to safety-critical hold |
| Output Type | Active-low open-drain RESET; allows wired-OR configuration and logic-level translation up to 5.5V |
| VCC Operating Range | 1.0V to 5.5V; guarantees functional reset assertion even during deep brownout before system collapse |
| Supply Transient Immunity | Immune to negative-going VCC glitches ≤50µs at 100mV overdrive; prevents false resets from noise or coupling |
| Package | 4-pin SOT143; compact footprint compatible with space-constrained portable and medical PCB layouts |
Pinout & Package
The MAX6423US23+T is housed in a 4-pin SOT143 package (package code U4+1, outline 21-0052), with 0.95mm pitch, 1.3mm × 1.3mm body size, and exposed pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Supply voltage input and reset threshold monitor node; must be decoupled locally to ensure stable detection |
| 2 | GND | Analog ground reference for internal comparators and ramp generator; requires low-impedance connection |
| 3 | RESET | Active-low open-drain output; requires external pullup (10kΩ–100kΩ) to target logic supply (0–5.5V) |
| 4 | SRT | Set-reset-time input; connects to external timing capacitor (CSRT) to program reset timeout period |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise tailoring of reset hold time (275µs–5.75ms) without firmware or external logic |
| Guaranteed reset validity to VCC = 1V | Ensures µP remains held in reset until supply stabilizes above minimum operational voltage |
| Open-drain RESET output | Supports multi-supply logic interfacing and wired-OR reset bus architectures with auxiliary controllers |
| Laser-trimmed reset threshold | Delivers ±2.5% accuracy over full industrial temperature range, eliminating calibration overhead |
| Low 1.6µA quiescent current | Minimizes battery drain in always-connected IoT sensors and portable medical devices |
Applications
| Portable Equipment | Battery-Powered Controllers |
|---|---|
Use Scenario: Compact handheld diagnostic device powered by single-cell Li-ion battery with variable discharge profile. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low RESET to ARM Cortex-M0+ MCU during <2.313V brownout. Use Value: Prevents corrupted memory writes and firmware lockup during battery sag, extending usable runtime per charge cycle. | Use Scenario: Remote environmental sensor node operating on coin-cell battery for 5+ years. IC Role / Device Role / Timing Role: Low-quiescent-current supervisor holding µC in reset until VCC rises above 2.313V after cold-start. Use Value: Eliminates wake-up current spikes and ensures deterministic boot sequence under marginal supply conditions. |
| Automotive Body Electronics | Medical Instrumentation |
Use Scenario: Door module ECU subjected to load-dump and battery-reverse transients. IC Role / Device Role / Timing Role: Brownout detector triggering 4.375ms reset timeout (CSRT = 1500pF) to reinitialize CAN controller. Use Value: Maintains functional safety integrity by guaranteeing µP restart only after stable 12V rail recovery. | Use Scenario: Portable ultrasound probe requiring fail-safe power sequencing and glitch immunity. IC Role / Device Role / Timing Role: Supervisory IC asserting RESET during transient-induced VCC dip below 2.313V. Use Value: Prevents image artifacts or data loss by blocking processor execution until analog front-end rails stabilize. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6423XS23+T | Same electrical specs and reset threshold, but in SC70-4 package (X4+1 outline) | Requires different land pattern; used where board space or thermal profile favors SC70 over SOT143 | Select when footprint or assembly process favors SC70; identical functionality and performance |
| NCP302LSN23T1G | 2.3V reset threshold, push-pull active-low output, 1.5µA IQ, SOT23-3 package | Lacks capacitor-adjustable timeout (fixed 200ms); no SRT pin; smaller 3-pin footprint | Choose for cost-sensitive designs where fixed timeout suffices and board area is critical |
Compared with MAX6423US23+T, MAX6423XS23+T offers identical supervision behavior in a different package, while NCP302LSN23T1G trades adjustable timeout for reduced pin count and fixed delay - making it suitable for simpler, space-constrained applications where programmability is unnecessary.
Availability
MAX6423US23+T is available at Aetrix Electronics and suitable for portable equipment, battery-powered controllers, and automotive body electronics requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6423US23+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 supervision in space- and energy-constrained embedded systems, emphasizing accuracy, glitch immunity, and flexible timeout control.
FAQ
What is the exact reset threshold voltage of the MAX6423US23+T?
The MAX6423US23+T has a nominal reset threshold of 2.313V, with ±1.5% accuracy at +25°C and ±2.5% over the full -40°C to +125°C operating temperature range. This value is laser-trimmed at wafer test and specified in Table 1 of the datasheet under suffix "23". The MAX6423US23+T uses this precise threshold to trigger reset when VCC falls below the defined level.
How do I calculate the reset timeout capacitor for the MAX6423US23+T?
Use the formula CSRT = (tRP − 275µs) / 2.735 × 10⁶, where tRP is the desired timeout in seconds and CSRT is in farads. For example, a 4.375ms timeout requires CSRT = (0.004375 − 0.000275) / 2.735e6 ≈ 1500pF. The MAX6423US23+T's internal 240nA ramp current charges this capacitor to 0.65V to deassert RESET.
Can the MAX6423US23+T drive a 3.3V microcontroller reset input directly?
Yes - the MAX6423US23+T features an open-drain RESET output that can interface directly with 3.3V µP reset inputs using a 10kΩ–100kΩ pullup resistor to 3.3V. Its VOL is ≤0.3V at ISINK = 500µA, ensuring solid logic-low assertion. The MAX6423US23+T does not require level-shifting circuitry for 3.3V systems.
Is the MAX6423US23+T qualified for automotive applications?
The MAX6423US23+T itself is not AEC-Q100 qualified; only the MAX6340UK31/V+T variant in the same family carries AEC-Q100 Grade 2 qualification. However, the MAX6423US23+T operates across -40°C to +125°C and meets automotive ambient requirements for non-safety-critical body electronics, though formal qualification requires the designated part number.
What package type does the MAX6423US23+T use, and is it lead-free?
The MAX6423US23+T uses a 4-pin SOT143 package (U4+1 outline) with lead(Pb)-free termination, indicated by the "+" suffix in the part number. It complies with RoHS Directive 2011/65/EU and is supplied in tape-and-reel format. The MAX6423US23+T's package dimensions and land pattern are documented in Analog Devices' package drawing 21-0052.
MAX6423US23+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.313V
- 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:
- SOT-143-4
MAX6423US23+T FAQ
1.How can I place an order for MAX6423US23+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6423US23+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 MAX6423US23+T reliable?
The price and inventory of MAX6423US23+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6423US23+T is usually 5 days.
3.What payment methods are accepted for MAX6423US23+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6423US23+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6423US23+T?
MAX6423US23+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6423US23+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 MAX6423US23+T?
For technical support, including MAX6423US23+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6423US23+T requirements.
6.How does Aetrix verify that MAX6423US23+T is sourced from the original manufacturer or authorized distributors?
All MAX6423US23+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 MAX6423US23+T meets industry standards.
7.What is the process for return or replacement of MAX6423US23+T?
All MAX6423US23+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6423US23+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 MAX6423US23+T part is unused and in its original packaging.
Return procedure for MAX6423US23+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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