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Analog Devices Inc./Maxim Integrated MAX6425UK27+T
- Part No.:
- MAX6425UK27+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6425UK27+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,897
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Product details
Overview
MAX6425UK27+T from Analog Devices is a low-power microprocessor supervisor IC with open-drain active-low reset output, 2.7V nominal reset threshold (±2.5% over temperature), capacitor-adjustable reset timeout (3.0–5.75ms with 1500pF), 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 MAX6425UK27+T datasheet, MAX6425UK27+T pinout, MAX6425UK27+T application, or MAX6425UK27+T equivalent, key selection factors include its SOT23-5 open-drain RESET output, 1.6µA typical quiescent current, -40°C to +125°C operating range, and compatibility with multi-supply logic interfacing via external pullup.
Technical Context
The MAX6425UK27+T implements a precision voltage-detection circuit with laser-trimmed internal resistors to set the 2.7V reset threshold, coupled with a 240nA constant-current ramp source charging an external capacitor on the SRT pin. Reset deassertion occurs when the SRT voltage reaches 0.65V after VCC recovers above threshold.
Its open-drain RESET output supports wired-OR configurations and logic-level translation across supplies from 0V to 5.5V, while immunity to transients ≤50µs at 100mV overdrive ensures robust operation in noisy power environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.700V ±2.5% over -40°C to +125°C - sets precise brownout detection point for 2.7V/3.3V systems |
| Quiescent Current | 1.6µA typ at VCC ≤ 2.0V - enables multi-year battery life in always-on monitoring applications |
| Reset Timeout Range | 0.275ms to >10ms via 0–10nF SRT capacitor - configurable delay avoids premature µP release during slow power ramps |
| Operating Voltage | 1.0V to 5.5V - valid reset assertion even during deep brownout or ultra-low-VCC startup |
| Output Type | Active-low open-drain - allows shared reset bus and level-shifting with external pullup resistor |
| Temperature Range | -40°C to +125°C - qualified for automotive under-hood and industrial control environments |
| VCC to RESET Delay | 80µs max - fast response to supply collapse prevents instruction corruption |
Pinout & Package
MAX6425UK27+T is housed in a 5-pin SOT23-5 package (package code U5+2), with exposed pad not electrically connected. Pin 1 is SRT (Set Reset Timeout), Pin 2 is GND, Pin 3 is RESET (open-drain output), Pin 4 is N.C., and Pin 5 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SRT | Capacitor-adjustable timeout input | Connects to external timing capacitor; 240nA ramp current charges CSRT to 0.65V to define reset hold time |
| 2 - GND | Analog and digital ground reference | Common return path for internal bias and reset comparator; must be low-impedance for accurate threshold tracking |
| 3 - RESET | Active-low open-drain reset output | Drives low during fault; requires external pullup to any logic supply (0–5.5V) for system reset signaling |
| 4 - N.C. | No internal connection | May be tied to GND for mechanical stability; no electrical function or signal routing required |
| 5 - VCC | Supply and monitored voltage input | Powers device and serves as input to precision voltage detector; valid operation from 1.0V to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise tailoring of reset hold time (0.275ms–10ms+) to match specific µP power-up sequencing requirements |
| Open-drain RESET with 5.5V-tolerant output | Permits direct interface to 1.8V, 3.3V, or 5V µP reset inputs without level translators or voltage dividers |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset assertion during deep brownout conditions where many supervisors fail silently |
| Immunity to short VCC transients | Rejects glitches ≤50µs at 100mV overdrive, eliminating false resets in electrically noisy automotive or industrial power rails |
| Laser-trimmed threshold accuracy | Delivers ±1.5% initial accuracy and ±2.5% over full temperature range-critical for tight-margin 2.7V/3.3V systems |
Applications
| Battery-Powered Portable Equipment | Automotive Body Control Module |
|---|---|
Use Scenario: Power management in handheld medical meters with coin-cell batteries and intermittent wake-up cycles. IC Role / Device Role / Timing Role: Monitors main 3.3V rail and asserts open-drain RESET to halt µP during voltage sag below 2.7V; timeout ensures stable boot after recovery. Use Value: 1.6µA quiescent current extends battery life beyond 5 years; open-drain output interfaces directly to 1.8V µP reset pin via 10kΩ pullup. | Use Scenario: Supervision of 5V supply feeding door-lock MCU in harsh under-dash environment. IC Role / Device Role / Timing Role: Detects brownout on 5V rail and holds MCU in reset until supply stabilizes; operates reliably from -40°C to +125°C. Use Value: ±2.5% threshold accuracy over temperature prevents spurious resets during thermal cycling; transient immunity rejects load-dump-induced glitches. |
| Industrial Embedded Controller | Medical Diagnostic Handheld |
Use Scenario: Reliable startup sequencing for PLC I/O module powered from unregulated 24V-to-3.3V DC-DC converter. IC Role / Device Role / Timing Role: Provides adjustable reset timeout (via 2200pF SRT cap) to accommodate slow-ramping 3.3V rail; open-drain output shares reset bus with auxiliary watchdog. Use Value: Wired-OR capability allows auxiliary safety circuit to extend system reset independently; N.C. pin simplifies PCB layout. | Use Scenario: Critical power supervision in ultrasound probe with dual 3.3V/1.8V rails and strict FDA reliability requirements. IC Role / Device Role / Timing Role: Monitors primary 3.3V rail and asserts RESET to ARM Cortex-M4; guaranteed operation down to VCC = 1V prevents undetected brownout lockup. Use Value: Laser-trimmed 2.7V threshold matches system's minimum functional voltage; 125°C rating supports sterilization cycle thermal stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP302LSN27T1G | Fixed 2.7V threshold, 200ms fixed timeout, push-pull output, no SRT pin | Lacks capacitor-adjustable timeout and open-drain flexibility; requires redesign if wired-OR or multi-supply reset needed | Select when fixed long timeout suffices and board space permits larger SOT23-3 footprint |
| TLV803EB27DBZR | 2.7V threshold, 200ms fixed timeout, open-drain output, 1.8µA IQ, same SOT23-5 pinout | Same package and output type but fixed timeout limits adaptability to varying µP requirements | Choose for drop-in replacement where timeout flexibility is unnecessary and TI sourcing is preferred |
Compared with NCP302LSN27T1G and TLV803EB27DBZR, the MAX6425UK27+T uniquely combines open-drain output, capacitor-adjustable timeout, and guaranteed 1V operation-enabling design reuse across diverse µP platforms without layout changes or timeout compromises.
Availability
MAX6425UK27+T is available at Aetrix Electronics and suitable for battery-powered portable equipment, automotive body electronics, and industrial embedded controllers requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6425UK27+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 delivers ultra-low-power, precision voltage supervision for resource-constrained embedded systems-designed specifically for reliable µP reset generation in portable, automotive, and medical applications.
FAQ
What is the exact reset threshold voltage of MAX6425UK27+T and how does it vary with temperature?
The MAX6425UK27+T has a nominal reset threshold of 2.700V, with ±1.5% accuracy at +25°C and ±2.5% over the full -40°C to +125°C operating range. This tolerance ensures reliable brownout detection in 2.7V/3.3V systems despite thermal drift, and is achieved via laser-trimmed internal resistors. The MAX6425UK27+T datasheet specifies VTH = 2.633V (min) to 2.768V (max) across temperature.
Can MAX6425UK27+T drive a 5V microcontroller reset input using its open-drain output?
Yes, the MAX6425UK27+T open-drain RESET output is rated for up to 5.5V, allowing direct connection to a 5V µP reset input via an external pullup resistor (e.g., 10kΩ to 5V). When asserted, RESET pulls low to <0.4V at 3.2mA sink current; when released, the pullup defines the high level. This eliminates level-shifters and supports mixed-voltage system designs. The MAX6425UK27+T's output structure is explicitly designed for this multi-supply interoperability.
How do I calculate the SRT capacitor value for a 4.5ms reset timeout with MAX6425UK27+T?
Use the formula CSRT = (tRP − 275µs) / 2.735 × 10⁶, where tRP is in seconds. For 4.5ms: CSRT = (0.0045 − 0.000275) / 2,735,000 ≈ 1545pF. A standard 1500pF ceramic capacitor yields ~4.375ms (within datasheet spec), and leakage <10nA is required. The MAX6425UK27+T's SRT pin must be routed short and away from noise sources to maintain timing accuracy.
Is MAX6425UK27+T compatible with the same PCB footprint as NCP302LSN27T1G?
No, MAX6425UK27+T uses a 5-pin SOT23-5 package (pins: SRT, GND, RESET, N.C., VCC), while NCP302LSN27T1G is a 3-pin SOT23-3 (VDD, GND, RESET). They are not pin-compatible. The MAX6425UK27+T requires four dedicated traces (including SRT and N.C.), whereas the NCP302 lacks timeout adjustment and N.C. functionality. Board redesign is necessary for substitution.
Does MAX6425UK27+T meet AEC-Q100 automotive qualification standards?
The MAX6425UK27+T itself is not individually AEC-Q100 qualified per the datasheet; only the MAX6340UK31/V+T variant is explicitly listed as AEC-Q100 qualified. However, MAX6425UK27+T shares the same BiCMOS process, -40°C to +125°C operating range, and automotive-grade reliability testing as qualified variants. For mission-critical automotive use, confirm qualification status with Analog Devices' latest compliance documentation before final design-in. The MAX6425UK27+T is widely deployed in non-safety-critical automotive modules.
MAX6425UK27+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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.7V
- 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
MAX6425UK27+T FAQ
1.How can I place an order for MAX6425UK27+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6425UK27+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 MAX6425UK27+T reliable?
The price and inventory of MAX6425UK27+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6425UK27+T is usually 5 days.
3.What payment methods are accepted for MAX6425UK27+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6425UK27+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6425UK27+T?
MAX6425UK27+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6425UK27+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 MAX6425UK27+T?
For technical support, including MAX6425UK27+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6425UK27+T requirements.
6.How does Aetrix verify that MAX6425UK27+T is sourced from the original manufacturer or authorized distributors?
All MAX6425UK27+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 MAX6425UK27+T meets industry standards.
7.What is the process for return or replacement of MAX6425UK27+T?
All MAX6425UK27+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6425UK27+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 MAX6425UK27+T part is unused and in its original packaging.
Return procedure for MAX6425UK27+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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