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Analog Devices Inc./Maxim Integrated MAX6422US46+T
- Part No.:
- MAX6422US46+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6422US46+T.pdf
- Description:
- IC MPU/RESET CIRC 4.625V SOT143
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
MAX6422US46+T from Analog Devices is a low-power, active-high push-pull microprocessor supervisor IC that monitors VCC supply voltage and asserts a reset signal when voltage falls below 4.625V (typical), with capacitor-adjustable timeout (3.0–5.75ms at CSRT = 1500pF), guaranteed operation down to VCC = 1V, and quiescent current of 1.6µA (typ) at 2.0V - used in battery-powered controllers and portable equipment for reliable power-up sequencing.
For engineers reviewing the MAX6422US46+T datasheet, MAX6422US46+T pinout, MAX6422US46+T application, or MAX6422US46+T equivalent, key selection criteria include its 4-pin SOT143 package, active-high push-pull RESET output, factory-trimmed 4.625V threshold (±2.5% over -40°C to +125°C), capacitor-set timeout, and immunity to short VCC transients up to 50µs at 100mV overdrive.
Technical Context
The MAX6422US46+T implements a precision voltage-detection circuit with laser-trimmed internal resistors to set the 4.625V reset threshold, paired with a 240nA constant-current ramp source charging an external SRT capacitor to generate the reset timeout delay. Its push-pull output drives high to VCC (≥0.8×VCC) and low to ≤0.4V at 3.2mA sink, ensuring clean logic-level compatibility without external pullups.
It operates across -40°C to +125°C with full electrical specification guarantee, supports VCC from 1.0V to 5.5V, and maintains valid RESET assertion even as VCC drops to 1V - enabling robust brownout detection in wide-input industrial and automotive systems where supply stability cannot be assumed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.625V (typ), ±2.5% over -40°C to +125°C - ensures accurate brownout detection at nominal 4.6V rail |
| Reset Timeout | 3.00–5.75ms (CSRT = 1500pF) - configurable via external capacitor for µP reset hold time compliance |
| Supply Current | 1.6µA (typ) at VCC ≤ 2.0V - enables multi-year battery life in always-on monitoring applications |
| Output Type | Active-high push-pull - eliminates need for external pullup resistor and simplifies PCB routing |
| VCC Range | 1.0V to 5.5V - supports operation during deep brownout and compatibility with 1.2V–5V logic domains |
| Operating Temp | -40°C to +125°C - qualified for under-hood automotive and industrial embedded environments |
| VCC to RESET Delay | 80µs (VCC falling at 1mV/µs) - fast response to supply collapse prevents erroneous µP execution |
Pinout & Package
MAX6422US46+T is housed in a 4-pin SOT143 package (package code U4+1), with 1.3mm × 1.3mm footprint and 0.95mm height - optimized for space-constrained portable and wearable designs.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Supply input and monitored voltage rail - must be decoupled locally; valid operation down to 1.0V |
| 2 | GND | Analog ground reference - requires low-impedance connection to system ground plane |
| 3 | RESET | Active-high push-pull reset output - drives µP reset pin directly; sinks up to 3.2mA, sources ≥0.8×VCC |
| 4 | SRT | Set-reset-time input - connects to external timing capacitor (CSRT); sensitive to leakage and stray capacitance |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise µP reset hold time tuning (275µs to >100ms) using standard ceramic capacitors (0–10nF) |
| Guaranteed RESET validity to VCC = 1V | Ensures deterministic reset behavior during deep brownout, preventing runaway code execution below 1.2V rails |
| Low 1.6µA quiescent current | Extends battery life in coin-cell-powered IoT sensors and medical wearables requiring years of standby operation |
| Immunity to 50µs VCC glitches | Rejects transient noise on power rail without false resets - critical for noisy automotive and industrial power supplies |
| Factory-laser-trimmed 4.625V threshold | Eliminates external resistor network; achieves ±2.5% accuracy over full temperature range without calibration |
Applications
| Battery-Powered Controllers | Automotive Body Control Modules |
|---|---|
Use Scenario: Monitoring 5V supply in a handheld diagnostic tool powered by two AA cells with boost converter. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-high RESET to ARM Cortex-M0+ MCU during brownout or startup. Use Value: Prevents corrupted firmware execution during battery sag; 1.6µA ICC extends runtime by >15% versus higher-current supervisors. | Use Scenario: Reset supervision for LIN bus gateway MCU in door module exposed to load-dump and cold-crank conditions. IC Role / Device Role / Timing Role: Detecting VCC drop below 4.625V during cranking and holding RESET for 4.375ms to ensure clean MCU restart. Use Value: Meets AEC-Q100 stress requirements via design (shared family qualification); 125°C rating ensures reliability under hood. |
| Portable Medical Monitors | Industrial PLC I/O Modules |
Use Scenario: Power sequencing in a wearable ECG recorder with Li-ion battery and 3.3V/1.8V dual-rail PMIC. IC Role / Device Role / Timing Role: Supervising main 3.3V rail and generating timed reset pulse to ensure ADC and BLE SoC initialize synchronously. Use Value: Active-high push-pull output interfaces directly to SoC reset pin without level-shifting; low ICC reduces thermal load in sealed enclosure. | Use Scenario: Reset control for isolated RS-485 interface MCU in DIN-rail mounted controller operating from 24VDC supply. IC Role / Device Role / Timing Role: Monitoring local 5V LDO output and asserting RESET during undervoltage events caused by field wiring faults. Use Value: 80µs VCC-to-RESET delay ensures sub-cycle response to supply collapse; ±2.5% threshold tolerance avoids nuisance trips in noisy factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6421US46+T | Active-low push-pull RESET output; identical threshold, timeout, and package | Requires inverted reset logic on host µP; not suitable if µP lacks active-low reset input | Select when target MCU accepts active-low reset and board layout already accommodates polarity |
| MAX6424UK46+T | 5-pin SOT23-5 package; same 4.625V threshold and active-high push-pull output | Requires PCB redesign due to extra pin (N.C.) and different footprint; larger 1.6mm × 1.2mm body | Choose only if SOT23-5 is standardized across platform and pin 3 N.C. can be left floating |
Compared with MAX6421US46+T and MAX6424UK46+T, the MAX6422US46+T uniquely combines active-high logic, 4-pin SOT143 compactness, and guaranteed 1V operation - making it optimal for space- and polarity-constrained battery-powered designs where minimal BOM count and direct µP interface are critical.
Availability
MAX6422US46+T is available at Aetrix Electronics and suitable for battery-powered controllers, portable medical monitors, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6422US46+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 since 1965.
The MAX6421–MAX6426 product line delivers ultra-low-power, capacitor-programmable reset supervisors for space- and energy-constrained embedded systems - designed specifically for reliable power-up, brownout, and reset sequencing in portable and harsh-environment applications.
FAQ
What is the exact reset threshold voltage of the MAX6422US46+T?
The MAX6422US46+T has a factory-laser-trimmed nominal reset threshold of 4.625V, with tolerance of ±1.5% at +25°C and ±2.5% over the full operating temperature range (-40°C to +125°C). This value is confirmed in the Electrical Characteristics table and corresponds to the "46" suffix per Table 1 in the datasheet.
Does the MAX6422US46+T require an external pullup resistor on the RESET pin?
No, the MAX6422US46+T features an active-high push-pull RESET output, so no external pullup resistor is needed. It actively drives high to ≥0.8×VCC and low to ≤0.4V at rated sink current - unlike open-drain variants such as MAX6423US46+T which require external pullups.
Can the MAX6422US46+T operate reliably when VCC drops below 2.0V?
Yes, the MAX6422US46+T guarantees valid RESET assertion down to VCC = 1.0V, and its supply current remains as low as 1.6µA (typ) at VCC ≤ 2.0V. This makes the MAX6422US46+T suitable for brownout detection in systems with collapsing rails, such as battery-powered devices during end-of-life discharge.
What capacitor value sets a 4.375ms reset timeout for the MAX6422US46+T?
A 1500pF capacitor (CSRT) between SRT and GND yields a typical reset timeout of 4.375ms for the MAX6422US46+T, as specified in the Electrical Characteristics table under tRP. The relationship is linear: tRP = (2.73 × 10⁶ × CSRT) + 275µs, with CSRT in farads and tRP in seconds.
Is the MAX6422US46+T pin-compatible with other parts in the MAX642x family?
The MAX6422US46+T shares the same 4-pin SOT143 pinout with MAX6421US46+T and MAX6423US46+T, but differs in RESET polarity (active-high vs. active-low vs. open-drain). Pin compatibility does not imply functional interchangeability - swapping requires verification of µP reset input logic and external circuitry.
MAX6422US46+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.625V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
MAX6422US46+T FAQ
1.How can I place an order for MAX6422US46+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6422US46+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 MAX6422US46+T reliable?
The price and inventory of MAX6422US46+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6422US46+T is usually 5 days.
3.What payment methods are accepted for MAX6422US46+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6422US46+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6422US46+T?
MAX6422US46+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6422US46+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 MAX6422US46+T?
For technical support, including MAX6422US46+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6422US46+T requirements.
6.How does Aetrix verify that MAX6422US46+T is sourced from the original manufacturer or authorized distributors?
All MAX6422US46+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 MAX6422US46+T meets industry standards.
7.What is the process for return or replacement of MAX6422US46+T?
All MAX6422US46+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6422US46+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 MAX6422US46+T part is unused and in its original packaging.
Return procedure for MAX6422US46+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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