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Analog Devices Inc./Maxim Integrated MAX6425UK22+T
- Part No.:
- MAX6425UK22+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6425UK22+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:6,600
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Product details
Overview
MAX6425UK22+T from Analog Devices is a low-power microprocessor supervisor IC with open-drain active-low reset output, 2.188V ±2.5% factory-trimmed reset threshold, capacitor-adjustable reset timeout (275µs to 5.75ms), and guaranteed operation down to VCC = 1V. It monitors supply voltage in battery-powered embedded controllers and portable equipment to prevent erroneous code execution during brownout.
For engineers reviewing the MAX6425UK22+T datasheet, MAX6425UK22+T pinout, MAX6425UK22+T application, or MAX6425UK22+T equivalent, key selection criteria include its 5-pin SOT23-5 open-drain output architecture, 1.6µA typical quiescent current at 2V, immunity to sub-50µs VCC transients, and compatibility with external pullup voltages up to 5.5V.
Technical Context
The MAX6425UK22+T implements a precision voltage-detection circuit using laser-trimmed resistors to set a fixed 2.188V reset threshold with ±2.5% tolerance over −40°C to +125°C. Its reset assertion logic is triggered when VCC falls below this threshold and remains asserted for a user-defined timeout period determined by an external capacitor on the SRT pin.
A 240nA internal ramp current charges the SRT capacitor to a 0.65V internal reference; reset deassertion occurs only after the capacitor voltage reaches that level. The open-drain RESET output requires an external pullup resistor (10kΩ–100kΩ) and supports wired-OR configurations with auxiliary reset sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.188V ±2.5% - precise factory-trimmed trip point for reliable brownout detection across temperature |
| Quiescent Current | 1.6µA typ at VCC ≤ 2.0V - enables multi-year battery life in always-on monitoring applications |
| Reset Timeout Range | 275µs to 5.75ms - adjustable via external capacitor (0–1500pF) to match µP reset timing requirements |
| Supply Voltage Range | 1.0V to 5.5V - valid reset assertion and deassertion even during deep brownout conditions |
| Output Type | Active-low open-drain - allows level-shifting, wired-OR reset combining, and interfacing with diverse µP logic families |
| Operating Temperature | −40°C to +125°C - qualified for automotive under-hood and industrial control environments |
| VCC Transient Immunity | No reset for ≤50µs negative glitches ≥100mV below threshold - prevents false resets from noise or switching spikes |
Pinout & Package
MAX6425UK22+T is housed in a 5-pin SOT23-5 package with exposed pad (RoHS-compliant lead-free). Pin 1 is SRT (Set Reset Timeout), Pin 2 and Pin 4 are GND, Pin 3 is VCC, and Pin 5 is RESET (open-drain active-low).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SRT | Reset timeout capacitor input | Connects to external timing capacitor; 240nA ramp current sets delay duration with 0.65V reference |
| GND (Pins 2 & 4) | Ground reference | Dual ground pins reduce impedance and improve noise immunity in high-density PCB layouts |
| VCC | Supply and threshold monitor input | Monitors system rail directly; reset valid down to 1.0V ensures robustness during power collapse |
| RESET | Open-drain active-low reset output | Requires external pullup; sinks ≥500µA at VCC ≥ 1.8V; compatible with 0–5.5V logic domains |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise matching to µP reset hold time requirements without firmware changes or BOM variants |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic system behavior during deep undervoltage events where most supervisors fail |
| 2.5% max threshold accuracy over full temp range | Reduces design margin needed for reset timing, enabling tighter supply regulation and lower-cost power stages |
| 1.6µA typical ICC at 2V | Extends battery runtime in portable medical devices and IoT edge nodes operating on coin cells or energy harvesters |
| Open-drain output with 5.5V-tolerant pullup | Permits direct interface to 3.3V, 2.5V, or 1.8V µP reset inputs while powered from higher-voltage rails |
Applications
| Battery-Powered Portable Instrumentation | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Handheld multimeter with lithium coin-cell supply subject to voltage sag during measurement bursts. IC Role / Device Role / Timing Role: Supervisor IC asserting active-low reset to MSP430F5xx MCU until VCC stabilizes above 2.188V post-sag. Use Value: Prevents corrupted ADC calibration routines by enforcing minimum 3ms reset hold time via 1500pF SRT capacitor. |
Use Scenario: BCM microcontroller powered from vehicle battery with transient load dump spikes and cold-crank voltage drops. IC Role / Device Role / Timing Role: Voltage monitor triggering reset during cranking-induced brownout (<6V), with immunity to <50µs transients. Use Value: Ensures deterministic MCU restart after engine start without spurious resets caused by alternator noise. |
| Industrial Sensor Node with LoRaWAN Radio | Medical Infusion Pump Controller |
Use Scenario: Ultra-low-power sensor node harvesting energy from ambient light, powering nRF52840 MCU intermittently. IC Role / Device Role / Timing Role: Reset supervisor holding nRF52840 in reset until harvested energy raises VCC above 2.188V and sustains it for ≥1ms. Use Value: Eliminates boot failures due to marginal charge; 1.6µA ICC extends usable runtime between energy harvesting cycles. |
Use Scenario: Safety-critical infusion pump using PIC18F67J60 MCU, requiring fail-safe reset during AC/DC adapter dropout. IC Role / Device Role / Timing Role: Active-low open-drain RESET tied to MCU reset pin with 10kΩ pullup to 3.3V logic rail. Use Value: Enables independent reset domain isolation-logic rail can remain stable while main 24V supply collapses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP302LSN22T1G | Fixed 2.2V threshold, push-pull output, no capacitor-adjustable timeout (fixed 200ms) | Lacks timing flexibility; unsuitable where µP requires <1ms or >100ms reset hold | Choose for cost-sensitive designs needing simple fixed-delay reset without external capacitor |
| TLV809EC22DBZR | 2.2V threshold, open-drain output, fixed 140ms timeout, 0.5µA ICC at 3.3V | Higher ICC at low VCC; no brownout immunity spec; not qualified to −40°C to +125°C | Prefer for low-power consumer electronics where extended temperature range is unnecessary |
Compared with NCP302LSN22T1G and TLV809EC22DBZR, the MAX6425UK22+T provides field-configurable reset timing, superior low-VCC operation (valid to 1V), and AEC-Q100-aligned temperature performance-critical for industrial and automotive deployments where timing precision and environmental robustness are non-negotiable.
Availability
MAX6425UK22+T is available at Aetrix Electronics and suitable for battery-powered portable instrumentation, automotive body control modules, and medical infusion pump controllers requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MAX6425UK22+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 family was designed specifically for ultra-low-power, precision voltage monitoring in space-constrained embedded systems where supply integrity must be guaranteed across wide temperature and voltage ranges.
FAQ
What is the exact reset threshold voltage of the MAX6425UK22+T?
The MAX6425UK22+T features a factory-laser-trimmed reset threshold of 2.188V, with ±1.5% accuracy at +25°C and ±2.5% over the full −40°C to +125°C operating range. This value is confirmed in Table 1 of the official Analog Devices datasheet (Rev 11, 9/24) and corresponds to the "22" suffix in the part number.
Does the MAX6425UK22+T require an external pullup resistor on the RESET pin?
Yes, the MAX6425UK22+T has an open-drain active-low RESET output and requires an external pullup resistor. A value between 10kΩ and 100kΩ connected to any supply from 0V to 5.5V is recommended. The pullup ensures proper logic-high state when reset is deasserted and enables wired-OR functionality with other reset sources.
Can the MAX6425UK22+T operate reliably when VCC drops below 1.5V?
Yes-the MAX6425UK22+T guarantees valid reset assertion and deassertion down to VCC = 1.0V, as specified in the Electrical Characteristics table. Below 1.0V, RESET output drive capability degrades; however, for brownout detection in battery-powered systems, its 1.0V lower limit exceeds the operational range of most µPs, ensuring safe shutdown before logic corruption occurs.
How is the reset timeout period calculated for the MAX6425UK22+T?
The reset timeout period tRP for the MAX6425UK22+T is calculated as tRP = (2.73 × 10⁶ × CSRT) + 275µs, where tRP is in seconds and CSRT is in farads. For example, a 1500pF capacitor yields tRP ≈ 4.375ms (typical). This relationship is derived from the 240nA internal ramp current charging CSRT to the 0.65V internal reference voltage.
Is the MAX6425UK22+T pin-compatible with other devices in the MAX642x family?
Yes-the MAX6425UK22+T shares identical 5-pin SOT23-5 pinout and footprint with MAX6340, MAX6424, and MAX6426 variants. It is explicitly noted in the datasheet as pin-compatible with NCP300–NCP303, MC33464/MC33465, S807/S808/S809, and RN5VD series, enabling drop-in replacement in existing designs with matching reset threshold requirements.
MAX6425UK22+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.188V
- 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-23-5
MAX6425UK22+T FAQ
1.How can I place an order for MAX6425UK22+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6425UK22+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 MAX6425UK22+T reliable?
The price and inventory of MAX6425UK22+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6425UK22+T is usually 5 days.
3.What payment methods are accepted for MAX6425UK22+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6425UK22+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6425UK22+T?
MAX6425UK22+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6425UK22+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 MAX6425UK22+T?
For technical support, including MAX6425UK22+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6425UK22+T requirements.
6.How does Aetrix verify that MAX6425UK22+T is sourced from the original manufacturer or authorized distributors?
All MAX6425UK22+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 MAX6425UK22+T meets industry standards.
7.What is the process for return or replacement of MAX6425UK22+T?
All MAX6425UK22+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6425UK22+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 MAX6425UK22+T part is unused and in its original packaging.
Return procedure for MAX6425UK22+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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