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Analog Devices Inc./Maxim Integrated MAX6424UK26+T
- Part No.:
- MAX6424UK26+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6424UK26+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:5,174
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Product details
Overview
MAX6424UK26+T from Analog Devices is a low-power microprocessor supervisor IC with active-low push-pull reset output, 2.625V ±2.5% factory-trimmed reset threshold, 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 µP execution during power-up, brownout, or power-down.
For engineers reviewing the MAX6424UK26+T datasheet, MAX6424UK26+T pinout, MAX6424UK26+T application, or MAX6424UK26+T equivalent, key selection criteria include its SOT23-5 package, 1.6µA typical quiescent current, open-drain compatibility via logic-level flexibility, immunity to sub-50µs VCC transients, and precise 240nA SRT ramp current for repeatable timeout tuning.
Technical Context
The MAX6424UK26+T implements a precision voltage detector with laser-trimmed internal resistors setting the 2.625V reset threshold, coupled to a 240nA current source charging an external capacitor on the SRT pin to generate the reset timeout delay. Its push-pull RESET output drives low actively and pulls high to ≥0.8×VCC when deasserted, eliminating need for external pullup.
It operates across -40°C to +125°C with guaranteed reset validity down to VCC = 1V, and features hysteresis of 4×VTH (≈10.5mV) plus immunity to short VCC transients - a 100mV overdrive glitch lasting ≤50µs typically does not trigger reset. The device uses BiCMOS process with 295 transistors and requires no external components beyond the SRT capacitor for full functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.625V ±2.5% at -40°C to +125°C - ensures reliable detection of VCC drop below nominal 2.625V across full industrial temp range |
| Quiescent Current | 1.6µA typ at VCC ≤ 2.0V - enables multi-year battery life in always-on monitoring circuits |
| Reset Timeout Range | 275µs to 5.75ms (CSRT = 0 to 1500pF) - supports µP reset timing requirements from fast-boot to safety-critical hold durations |
| VCC Operating Range | 1.0V to 5.5V - allows use with 1.2V, 1.8V, 2.5V, 3.3V, and 5V systems without level-shifting |
| RESET Output Type | Active-low push-pull - provides rail-to-rail drive strength (≥1.2mA sink at VCC ≥ 2.7V) without external pullup resistor |
| SRT Ramp Current | 240nA ±20% - defines linear capacitor charging rate for predictable, temperature-stable timeout period |
| Supply Voltage Hysteresis | 10.5mV (4×VTH) - prevents oscillation near threshold during slow VCC transitions |
Pinout & Package
MAX6424UK26+T is housed in a 5-pin SOT23-5 package (package code U5+2, outline 21-0057), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and thermal pad option. Pin 3 is NC (not internally connected) and may be tied to GND for mechanical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal circuitry and SRT capacitor discharge path |
| 2 | RESET | Active-low push-pull output - sinks ≥1.2mA at VCC ≥ 2.7V; drives high to ≥0.8×VCC |
| 3 | N.C. | No internal connection - electrically isolated; may be grounded for PCB mechanical reinforcement |
| 4 | SRT | Set Reset Timeout input - accepts 240nA constant current to charge external capacitor for adjustable delay |
| 5 | VCC | Supply voltage and monitored rail - powers device and sets reset threshold reference |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise, application-specific reset hold time (275µs–5.75ms) using single low-leakage ceramic capacitor on SRT pin |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic µP reset assertion even during deep brownout conditions where most supervisors fail |
| Immunity to short VCC transients | Rejects glitches ≤50µs duration with 100mV overdrive - eliminates false resets in noisy automotive or industrial environments |
| Low quiescent current (1.6µA typ) | Minimizes battery drain in always-on monitoring, enabling >10-year operation on coin-cell batteries in portable medical devices |
| Laser-trimmed reset threshold accuracy | ±2.5% over -40°C to +125°C eliminates need for external calibration or margining in safety-critical designs |
Applications
| Battery-Powered Medical Monitors | Automotive Body Control Modules |
|---|---|
Use Scenario: Continuous ECG/SpO₂ monitoring in handheld patient-worn devices powered by CR2032 coin cells. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output to assert reset if battery sags below 2.625V, holding µP in reset until stable supply returns and timeout expires. Use Value: Prevents corrupted sensor data logging during low-battery brownout, leveraging 1.6µA ICC and 2.625V threshold matched to LiMnO₂ discharge curve. |
Use Scenario: Power management in door module ECUs exposed to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Monitors 5V system rail; asserts active-low RESET on VCC dip below 2.625V, with 4.375ms timeout ensuring MCU completes safe shutdown before power loss. Use Value: Immunity to ≤50µs transients avoids spurious resets during alternator switching noise, while push-pull output drives heavy RESET bus loads directly. |
| Industrial PLC I/O Submodules | Portable Test & Measurement Equipment |
Use Scenario: Remote analog input modules operating in unregulated 24V DC field wiring with wide ambient temperature swings. IC Role / Device Role / Timing Role: Supervises local 3.3V supply derived from buck converter; triggers reset on undervoltage, with timeout set to 3ms to meet IEC 61000-4-11 immunity requirements. Use Value: ±2.5% threshold accuracy over -40°C to +125°C ensures consistent trip point across harsh environments without derating. |
Use Scenario: Handheld multimeter with auto-ranging ADC and real-time display, powered by rechargeable Li-ion pack. IC Role / Device Role / Timing Role: Watches 1.8V core rail; asserts RESET when cell voltage drops below 2.625V (indicating end-of-discharge), initiating graceful shutdown sequence. Use Value: Valid operation down to VCC = 1V guarantees reset assertion even as battery decays past protection cutoff, preventing firmware lockup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP302LSN26T1G | 2.63V threshold, 1.3µA ICC, fixed 200ms timeout, SOT23-5, open-drain output | Lacks adjustable timeout and push-pull drive; requires external pullup; higher timeout limits fast-boot systems | Select when fixed long timeout suffices and open-drain logic compatibility with multiple supply domains is needed |
| TLV809EC26DBZR | 2.63V threshold, 0.65µA ICC, fixed 140ms timeout, SOT23-3, push-pull output | 3-pin package omits SRT adjustability; no capacitor-based timeout tuning; lower ICC but inflexible timing | Choose for ultra-low-power, space-constrained designs where fixed 140ms reset hold is acceptable |
Compared with NCP302LSN26T1G and TLV809EC26DBZR, the MAX6424UK26+T uniquely combines push-pull drive, capacitor-adjustable timeout, and guaranteed 1V operation - making it optimal for battery-sensitive, timing-flexible, and brownout-resilient µP supervision where design margins must be minimized.
Availability
MAX6424UK26+T is available at Aetrix Electronics and suitable for battery-powered medical monitors, automotive body control modules, and industrial PLC I/O submodules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6424UK26+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 MAX6424UK26+T belongs to the MAX6340/MAX6421–MAX6426 family of low-power µP supervisors designed specifically for reliable, low-current voltage monitoring in space- and power-constrained embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX6424UK26+T and how stable is it over temperature?
The MAX6424UK26+T has a factory-trimmed nominal reset threshold of 2.625V, with accuracy of ±1.5% at +25°C and ±2.5% over the full -40°C to +125°C operating range. This stability is achieved via laser-trimmed internal resistors and is confirmed in the Electrical Characteristics table under VTH parameter - no external calibration is required for precision brownout detection.
How do I calculate the external capacitor value needed for a specific reset timeout with the MAX6424UK26+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. Ceramic capacitors with leakage <10nA are recommended, and layout best practices require short, isolated SRT traces to avoid timing errors.
Does the MAX6424UK26+T require an external pullup resistor on its RESET pin?
No - the MAX6424UK26+T features an active-low push-pull RESET output, meaning it actively drives both high (to ≥0.8×VCC) and low (to ≤0.4V at 3.2mA sink). Unlike open-drain supervisors, it needs no external pullup resistor, simplifying BOM and improving noise immunity in high-speed or high-capacitance bus environments.
Can the MAX6424UK26+T operate reliably during brief power supply glitches?
Yes - the MAX6424UK26+T is specifically designed to reject short VCC transients. As shown in the Typical Operating Characteristics graph "Maximum Transient Duration vs. Reset Threshold Overdrive", it will not assert reset for a 100mV overdrive glitch lasting ≤50µs. This immunity prevents false resets in electrically noisy automotive or industrial settings.
What is the minimum supply voltage at which the MAX6424UK26+T guarantees valid RESET output behavior?
The MAX6424UK26+T guarantees valid RESET output (both high and low states) down to VCC = 1.0V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Below 1V, output drive capability degrades significantly - so designs requiring reset assertion during deep brownout must ensure VCC remains ≥1V when RESET is active.
MAX6424UK26+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:
- 2.625V
- Output:
- Push-Pull, Totem Pole
- 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
MAX6424UK26+T FAQ
1.How can I place an order for MAX6424UK26+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6424UK26+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 MAX6424UK26+T reliable?
The price and inventory of MAX6424UK26+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6424UK26+T is usually 5 days.
3.What payment methods are accepted for MAX6424UK26+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6424UK26+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6424UK26+T?
MAX6424UK26+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6424UK26+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 MAX6424UK26+T?
For technical support, including MAX6424UK26+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6424UK26+T requirements.
6.How does Aetrix verify that MAX6424UK26+T is sourced from the original manufacturer or authorized distributors?
All MAX6424UK26+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 MAX6424UK26+T meets industry standards.
7.What is the process for return or replacement of MAX6424UK26+T?
All MAX6424UK26+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6424UK26+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 MAX6424UK26+T part is unused and in its original packaging.
Return procedure for MAX6424UK26+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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