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Analog Devices Inc./Maxim Integrated MAX6425UK16+T
- Part No.:
- MAX6425UK16+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6425UK16+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,425
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Product details
Overview
MAX6425UK16+T from Analog Devices is a low-power microprocessor supervisor IC with open-drain active-low reset output, 1.575V nominal reset threshold (±2.5% over temperature), capacitor-adjustable reset timeout (275µs to 5.75ms), and guaranteed operation down to VCC = 1V. It monitors system supply voltage in portable, battery-powered, and automotive applications to prevent erroneous microprocessor execution during power-up, brownout, or power-down.
For engineers reviewing the MAX6425UK16+T datasheet, MAX6425UK16+T pinout, MAX6425UK16+T application, or MAX6425UK16+T equivalent, key selection criteria include its SOT23-5 open-drain reset architecture, 1.6µA typical quiescent current, ±2.5% reset threshold accuracy over –40°C to +125°C, and compatibility with external pullup voltages up to 5.5V.
Technical Context
The MAX6425UK16+T implements a precision voltage-detection circuit with laser-trimmed internal resistors to set its 1.575V reset threshold. Its reset assertion is triggered when VCC falls below this threshold, and deassertion is delayed by an externally adjustable timeout determined by a ramp current source (240nA) charging a capacitor on the SRT pin to a 0.65V internal reference.
As an open-drain device, it requires an external pullup resistor (10kΩ–100kΩ) to define the high-state logic level, enabling interoperability with µPs operating at different I/O voltages (0–5.5V). It guarantees valid reset output behavior down to VCC = 1V and exhibits immunity to short negative-going VCC transients (e.g., ≤50µs for 100mV overdrive).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.575V nominal, ±2.5% over –40°C to +125°C - ensures reliable detection of 1.6V system rails across automotive/industrial temperature range |
| Quiescent Current | 1.6µA typical at VCC ≤ 2.0V - enables multi-year battery life in always-on monitoring circuits |
| Reset Timeout Range | 275µs (CSRT = 0) to 5.75ms (CSRT = 1500pF) - supports µP reset timing requirements from fast-boot to safety-critical systems |
| Output Type | Active-low open-drain - allows wired-OR reset combining and flexible logic-level interfacing up to 5.5V |
| VCC Operating Range | 1.0V to 5.5V - maintains reset validity during deep brownout conditions where other supervisors fail |
| Supply Voltage Hysteresis | 4 × VTH (≈6.3mV) - prevents oscillation near threshold during slow-ramping supplies |
| Reset Propagation Delay | 80µs max (VCC falling at 1mV/µs) - provides deterministic response to rapid supply collapse |
Pinout & Package
MAX6425UK16+T is housed in a 5-pin SOT23-5 package (package code U5+2), RoHS-compliant, tape-and-reel format. Pin 1 is SRT (Set Reset Timeout), Pin 2 is GND, Pin 3 is RESET (open-drain output), Pin 4 is GND (second ground terminal), Pin 5 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SRT | Reset timeout capacitor input | Connects to external timing capacitor; 240nA constant current charges CSRT to 0.65V to set tRP - trace routing must minimize leakage and stray capacitance |
| 2 - GND | Analog ground reference | Primary ground return for internal voltage reference and comparator - must be low-impedance connection to system ground plane |
| 3 - RESET | Open-drain reset output | Asserts low during VCC fault; requires external pullup (10kΩ–100kΩ) to define logic-high level - enables multi-voltage system reset coordination |
| 4 - GND | Second ground terminal | Provides additional ground path to reduce package inductance and improve noise immunity - must be connected to same ground net as Pin 2 |
| 5 - VCC | Supply and monitored voltage input | Monitors system rail directly; operates and asserts valid reset down to 1.0V - no separate reference or bias supply required |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise tailoring of reset hold time (275µs–5.75ms) without firmware or external logic - critical for diverse µP boot sequences |
| Open-drain RESET with 5.5V-tolerant pullup | Supports mixed-voltage systems (e.g., 1.8V µP with 3.3V or 5V logic) via single external resistor - eliminates level-shifter components |
| Guaranteed operation to VCC = 1V | Maintains deterministic reset assertion even during severe brownout - prevents runaway code execution when supply collapses below 1.2V |
| 240nA SRT ramp current source | Delivers stable, temperature-invariant timeout setting - reduces sensitivity to capacitor tolerance and aging vs. RC-based alternatives |
| ±2.5% reset threshold accuracy over full temp range | Meets AEC-Q100-grade stability for automotive under-hood applications without calibration - avoids false resets in thermal cycling |
Applications
| Battery-Powered Medical Sensors | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Continuous glucose monitor powered by coin-cell battery, requiring ultra-low-power supervision during sleep mode and wake-up events. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low reset to ARM Cortex-M0+ MCU when VCC drops below 1.575V during battery depletion. Use Value: 1.6µA quiescent current extends battery life beyond 3 years; open-drain output interfaces directly to 3.3V MCU reset pin using 47kΩ pullup. | Use Scenario: BCM microcontroller monitoring 12V battery via LDO-regulated 3.3V rail, subject to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Brownout detector triggering 4.375ms reset pulse after VCC recovers from transient dip below 1.575V. Use Value: Immunity to ≤50µs transients prevents spurious resets; ±2.5% threshold accuracy ensures consistent behavior across –40°C to +125°C under-hood environment. |
| Industrial IoT Edge Node | Portable Test Equipment |
Use Scenario: LoRaWAN sensor node with dual-supply architecture (1.8V MCU, 3.3V radio), powered by rechargeable Li-ion cell. IC Role / Device Role / Timing Role: Single-point voltage monitor for 1.8V rail, coordinating reset of both MCU and radio subsystems via wired-OR configuration. Use Value: Open-drain output allows shared RESET line pulled to 3.3V - eliminates need for discrete OR-gate or dual supervisors. | Use Scenario: Handheld oscilloscope with FPGA-based acquisition engine, requiring clean power-on reset independent of analog front-end sequencing. IC Role / Device Role / Timing Role: Primary supervisor for 2.5V FPGA core supply, generating 2.5ms reset pulse timed to allow LDO stabilization before configuration. Use Value: Capacitor-adjustable timeout (CSRT = 910pF) precisely matches FPGA vendor's minimum reset duration requirement - no firmware delay needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP302LS16T1G | Fixed 1.6V threshold, push-pull output, no adjustable timeout - uses internal timer (~200ms) | Lacks capacitor-adjustable delay; incompatible with µPs requiring sub-millisecond reset hold times | Select only if fixed long-duration reset and push-pull drive are acceptable; not suitable for low-power or timing-critical designs |
| MC33464D-16SEFR2 | 1.6V threshold, open-drain output, fixed 200ms timeout - no SRT pin or external timing capacitor | Timeout cannot be reduced below 200ms; higher ICC (5µA typ) limits battery lifetime | Use only in non-battery applications where long reset duration is acceptable and layout space prohibits external capacitor |
Compared with NCP302LS16T1G and MC33464D-16SEFR2, MAX6425UK16+T offers design flexibility through its adjustable timeout (275µs–5.75ms), ultra-low 1.6µA quiescent current, and guaranteed VCC = 1V operation - making it uniquely suited for compact, battery-constrained, and thermally demanding embedded systems.
Availability
MAX6425UK16+T is available at Aetrix Electronics and suitable for battery-powered medical sensors, automotive body control modules, industrial IoT edge nodes, and portable test equipment requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.
Supply support for MAX6425UK16+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 MAX6425UK16+T belongs to the MAX6340/MAX6421–MAX6426 family of low-power µP supervisors, designed specifically for reliable power-monitoring in space-constrained, energy-sensitive, and thermally harsh environments.
FAQ
What is the exact reset threshold voltage of MAX6425UK16+T and how does it vary with temperature?
The MAX6425UK16+T has a nominal reset threshold of 1.575V, with ±1.5% accuracy at +25°C and ±2.5% over the full –40°C to +125°C operating range. This specification is laser-trimmed at wafer sort and verified per Analog Devices' production test flow. The threshold remains stable across temperature due to matched resistor ratios in its BiCMOS process - no external calibration is needed. MAX6425UK16+T meets this performance without derating or margining in automotive under-hood designs.
Can MAX6425UK16+T drive a reset line referenced to a voltage higher than its VCC supply?
Yes - MAX6425UK16+T features an open-drain RESET output rated for up to 6.0V absolute maximum, allowing direct connection to pullup resistors tied to 3.3V, 5V, or even 5.5V logic rails regardless of its own VCC (1.0V–5.5V). This enables seamless integration into mixed-voltage systems. The device guarantees valid logic levels (VOL ≤ 0.4V at 3.2mA sink, VOH ≥ 0.8×VPU at 1µA source) across all supported pullup voltages. MAX6425UK16+T is explicitly designed for this use case per its "Interfacing to Other Voltages" application note.
How do I calculate the external capacitor value for a specific reset timeout period with MAX6425UK16+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 3.5ms timeout requires CSRT = (0.0035 − 0.000275) / 2.735e6 ≈ 1180pF. Ceramic capacitors with <10nA leakage are recommended; X7R or C0G dielectrics ensure stability. MAX6425UK16+T's 240nA SRT current source and 0.65V internal reference make this calculation highly predictable - typical deviation is <±5% with 5% tolerance capacitors.
Does MAX6425UK16+T require any external components besides the SRT capacitor?
Yes - MAX6425UK16+T requires an external pullup resistor on the RESET pin (typically 10kΩ–100kΩ to a logic-compatible voltage) and the SRT timing capacitor. No decoupling capacitor is mandatory but recommended (100nF ceramic near VCC/GND pins) for noise immunity. Unlike push-pull variants, it does not need series resistance on RESET. MAX6425UK16+T's open-drain architecture eliminates the need for output buffers or level shifters in multi-rail systems - simplifying BOM and layout.
Is MAX6425UK16+T qualified for automotive applications?
While MAX6425UK16+T itself is not individually AEC-Q100 certified, it belongs to the MAX6340/MAX6421–MAX6426 family, several members of which (e.g., MAX6340UK31/V+T) are AEC-Q100 qualified. MAX6425UK16+T shares identical process, design, and qualification flow - including BiCMOS fabrication, -40°C to +125°C operation, and robust transient immunity. Its ±2.5% threshold accuracy and 1.6µA ICC meet common automotive brownout monitoring requirements. MAX6425UK16+T is widely deployed in automotive infotainment and body electronics where full AEC-Q100 certification is not mandated.
MAX6425UK16+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:
- 1.575V
- 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
MAX6425UK16+T FAQ
1.How can I place an order for MAX6425UK16+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6425UK16+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 MAX6425UK16+T reliable?
The price and inventory of MAX6425UK16+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6425UK16+T is usually 5 days.
3.What payment methods are accepted for MAX6425UK16+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6425UK16+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6425UK16+T?
MAX6425UK16+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6425UK16+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 MAX6425UK16+T?
For technical support, including MAX6425UK16+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6425UK16+T requirements.
6.How does Aetrix verify that MAX6425UK16+T is sourced from the original manufacturer or authorized distributors?
All MAX6425UK16+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 MAX6425UK16+T meets industry standards.
7.What is the process for return or replacement of MAX6425UK16+T?
All MAX6425UK16+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6425UK16+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 MAX6425UK16+T part is unused and in its original packaging.
Return procedure for MAX6425UK16+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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