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Analog Devices Inc./Maxim Integrated MAX6424UK23+T
- Part No.:
- MAX6424UK23+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6424UK23+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:992
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Product details
Overview
MAX6424UK23+T from Analog Devices is a low-power microprocessor supervisor IC with active-low push-pull reset output, 2.313V ±2.5% factory-trimmed reset threshold, 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 requiring precise brownout protection.
For engineers reviewing the MAX6424UK23+T datasheet, MAX6424UK23+T pinout, MAX6424UK23+T application, or MAX6424UK23+T equivalent, key selection factors include its SOT23-5 package, 1.6µA typical quiescent current, immunity to short VCC transients, and compatibility with µP reset inputs requiring active-low assertion with no external pullup.
Technical Context
The MAX6424UK23+T implements a precision voltage-detection circuit using laser-trimmed resistors to set its 2.313V reset threshold, with ±2.5% accuracy over –40°C to +125°C. Its internal 240nA current source charges an external capacitor on the SRT pin to generate a programmable reset timeout delay.
Reset assertion occurs when VCC falls below the threshold; deassertion is delayed by the SRT capacitor ramp time to reach 0.65V. The push-pull output drives low to 0.3V at 50µA (VCC ≥ 1.0V) and high to 0.8×VCC, eliminating need for external pullup components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.313V ±2.5% - precisely trimmed for reliable detection of 2.3V system rail brownout |
| Quiescent Current | 1.6µA typ at VCC ≤ 2.0V - enables multi-year battery life in always-on monitoring |
| Reset Timeout Range | 0.275ms to >10ms - adjustable via external capacitor (e.g., 3.0–5.75ms at 1500pF) |
| Operating Voltage | 1.0V to 5.5V - valid reset signaling even during deep brownout down to 1V supply |
| Output Type | Active-low push-pull - directly interfaces µP reset pins without pullup resistor |
| Temperature Range | –40°C to +125°C - qualified for automotive and industrial under-hood/enclosure use |
| VCC to Reset Delay | 80µs - fast response to supply collapse, minimizing firmware corruption window |
Pinout & Package
MAX6424UK23+T is housed in a 5-pin SOT23-5 package with 1.6mm × 2.9mm footprint, 0.95mm height, and gull-wing leads compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCC | Supply and threshold monitor input | Primary power rail connection; reset logic references this voltage |
| 2 - GND | Ground reference | Return path for internal circuitry and reset output sink current |
| 3 - SRT | Reset timeout capacitor input | Connect external capacitor to ground to set delay; sensitive to leakage and stray capacitance |
| 4 - RESET | Active-low push-pull reset output | Drives low (≤0.3V) during fault; high (≥0.8×VCC) otherwise - no pullup needed |
| 5 - N.C. | No internal connection | Not bonded; may be left floating or tied to GND for mechanical stability |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed reset threshold | 2.313V with ±2.5% tolerance over full temperature range ensures consistent brownout detection across environments |
| Capacitor-adjustable timeout | External SRT capacitor sets delay from 275µs to >10ms, enabling match to diverse µP reset timing requirements |
| 1.6µA typical supply current | Enables integration into energy-constrained systems such as coin-cell–powered IoT sensors without compromising battery life |
| Valid reset down to VCC = 1V | Guarantees clean reset assertion through deep undervoltage conditions where most supervisors fail |
| Immunity to short VCC transients | Rejects glitches ≤50µs at 100mV overdrive, preventing spurious resets in noisy power environments |
Applications
| Battery-Powered Portable Instrumentation | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Handheld medical meter operating from single Li-ion cell with dynamic load-induced voltage sag. IC Role / Device Role / Timing Role: Monitors VCC and asserts active-low RESET to halt MCU execution during brownout until stable supply returns. Use Value: Prevents corrupted EEPROM writes and erratic sensor readings during transient dips below 2.3V, leveraging 1.6µA quiescent current to extend battery runtime. | Use Scenario: BCM microcontroller subjected to load dump and cold-crank voltage transients in 12V vehicle electrical system. IC Role / Device Role / Timing Role: Provides robust reset supervision with 80µs VCC-to-reset delay and glitch immunity up to 50µs. Use Value: Ensures deterministic MCU restart after ignition cycles, avoiding boot failures caused by brief <2.3V excursions during cranking. |
| Industrial PLC I/O Module | Smart Energy Meter |
Use Scenario: DIN-rail mounted I/O module powered from isolated 3.3V DC-DC converter with variable line regulation. IC Role / Device Role / Timing Role: Supervises 3.3V rail and generates programmable reset pulse (via 1500pF SRT cap) matching PLC controller's minimum reset hold time. Use Value: Eliminates need for discrete RC network; capacitor-adjustable timeout ensures compliance with IEC 61000-4-2/4-4 immunity test recovery timing. | Use Scenario: Revenue-grade meter with backup supercapacitor maintaining RTC and memory during AC mains failure. IC Role / Device Role / Timing Role: Detects main supply collapse and triggers controlled shutdown sequence before VCC drops below 2.313V. Use Value: Guarantees safe state capture and nonvolatile storage write completion using 2.313V threshold aligned to supercap discharge curve. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP302LSN23T1G | 2.3V fixed threshold, open-drain output, no SRT adjustment - requires external pullup | Lacks capacitor-programmable timeout; suitable only where fixed 200ms delay suffices | Choose if board space is constrained and fixed delay acceptable; verify µP input compatibility with open-drain drive |
| TLV803EB23DBZR | 2.32V threshold, 35µA IQ, push-pull output, fixed 200ms timeout - no external capacitor option | Higher quiescent current limits battery life; fixed timeout reduces design flexibility | Select when simplified BOM and qualification speed outweigh need for adjustable delay and ultra-low IQ |
Compared with NCP302LSN23T1G and TLV803EB23DBZR, the MAX6424UK23+T uniquely combines ultra-low 1.6µA supply current, capacitor-adjustable reset timeout, and push-pull output - enabling longer battery life, precise timing control, and elimination of external pullup components in space- and power-sensitive designs.
Availability
MAX6424UK23+T is available at Aetrix Electronics and suitable for battery-powered portable instrumentation, automotive body control modules, and industrial PLC I/O modules requiring stable component supply with long-term lifecycle support.
Supply support for MAX6424UK23+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 MAX6424UK23+T belongs to the MAX6340/MAX6421–MAX6426 family of low-power microprocessor supervisors, designed specifically for reliable reset generation in battery-constrained and thermally harsh embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX6424UK23+T?
The MAX6424UK23+T has a factory-laser-trimmed nominal reset threshold of 2.313V, with ±2.5% accuracy over the full –40°C to +125°C operating temperature range. This value is confirmed in Table 1 of the datasheet under suffix "23", and applies specifically to the MAX6424UK23+T variant-not the broader MAX6424 family.
Does the MAX6424UK23+T require an external pullup resistor on its RESET pin?
No, the MAX6424UK23+T features an active-low push-pull RESET output, which actively drives both high (to 0.8×VCC) and low (to ≤0.3V). Unlike open-drain supervisors, it does not require an external pullup resistor-reducing BOM count and PCB area. This behavior is explicitly defined in the General Description and Electrical Characteristics sections for the MAX6424 variant.
How is the reset timeout period set for the MAX6424UK23+T?
The reset timeout period of the MAX6424UK23+T is set by connecting an external capacitor (CSRT) between the SRT pin and ground. The relationship is tRP = 2.73 × 10⁶ × CSRT + 275µs, where tRP is in seconds and CSRT in farads. For example, a 1500pF capacitor yields 3.0–5.75ms timeout. This capacitor must be low-leakage (<10nA); ceramic is recommended.
Can the MAX6424UK23+T operate reliably when VCC drops below 2.0V?
Yes, the MAX6424UK23+T guarantees valid RESET output operation down to VCC = 1.0V, as stated in the Absolute Maximum Ratings and Electrical Characteristics tables. Its reset assertion remains functional and its push-pull output maintains specified VOL and VOH levels even at 1.0V supply-critical for brownout recovery in systems with collapsing rails.
What package type and pin count does the MAX6424UK23+T use?
The MAX6424UK23+T uses a 5-pin SOT23-5 package (package code U5+2), with 1.6mm × 2.9mm body size and gull-wing leads. Pin 1 is VCC, Pin 2 is GND, Pin 3 is SRT, Pin 4 is RESET, and Pin 5 is N.C. This matches the pin configuration shown in Figure 7 of the datasheet and is distinct from the 4-pin SC70/SOT143 variants used by MAX6421/MAX6422/MAX6423.
MAX6424UK23+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:
- 2.313V
- 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
MAX6424UK23+T FAQ
1.How can I place an order for MAX6424UK23+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6424UK23+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 MAX6424UK23+T reliable?
The price and inventory of MAX6424UK23+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6424UK23+T is usually 5 days.
3.What payment methods are accepted for MAX6424UK23+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6424UK23+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6424UK23+T?
MAX6424UK23+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6424UK23+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 MAX6424UK23+T?
For technical support, including MAX6424UK23+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6424UK23+T requirements.
6.How does Aetrix verify that MAX6424UK23+T is sourced from the original manufacturer or authorized distributors?
All MAX6424UK23+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 MAX6424UK23+T meets industry standards.
7.What is the process for return or replacement of MAX6424UK23+T?
All MAX6424UK23+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6424UK23+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 MAX6424UK23+T part is unused and in its original packaging.
Return procedure for MAX6424UK23+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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