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Analog Devices Inc./Maxim Integrated MAX6425UK23
- Part No.:
- MAX6425UK23
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6425UK23.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:238
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Product details
Overview
MAX6425UK23 from Maxim Integrated is a low-power microprocessor supervisor IC with open-drain active-low reset output, 2.313V factory-trimmed reset threshold, capacitor-adjustable reset timeout (275µs base + 2.73×10⁶·CSRT), and guaranteed operation down to VCC = 1V. It monitors system supply voltage in portable, automotive, and medical equipment where reliable power-on reset and brownout protection are critical.
For engineers reviewing the MAX6425UK23 datasheet, MAX6425UK23 pinout, MAX6425UK23 application, or MAX6425UK23 equivalent, this page delivers verified technical context, exact pin functions, real-world application mappings, and validated alternative options for voltage-monitoring reset circuits in space-constrained, battery-sensitive designs.
Technical Context
The MAX6425UK23 uses a precision internal 0.65V reference and 240nA laser-trimmed ramp current source to generate a capacitor-controlled reset timeout period. Its open-drain RESET output requires an external pullup and supports logic-level interfacing across supplies up to 5.5V.
It features hysteresis of 4×VTH (≈9.25mV), immunity to VCC transients ≤50µs when overdriven by 100mV below VTH, and valid reset assertion even as VCC falls to 1.0V - enabling robust operation during deep brownouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.313V ±2.5% (factory-laser-trimmed; enables precise power-rail monitoring at 2.3V systems) |
| Supply Voltage Range | 1.0V to 5.5V (supports operation during deep undervoltage conditions before µP shutdown) |
| Quiescent Current | 1.6µA typical at VCC ≤ 2.0V (enables multi-year battery life in always-on monitoring) |
| Reset Timeout Base | 275µs minimum (capacitor-adjustable up to milliseconds; ensures µP initialization completes) |
| VCC to Reset Delay | 80µs (fast response to supply collapse; prevents code corruption during rapid droop) |
| Output Type | Active-low open-drain (allows wired-OR reset combining and flexible logic-level translation) |
| Hysteresis | 4 × VTH ≈ 9.25mV (prevents chatter near threshold during slow VCC recovery) |
Pinout & Package
MAX6425UK23 is housed in a 5-pin SOT23-5 package (3.0mm × 1.7mm × 1.3mm), optimized for high-density PCB layouts in portable and automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Ground reference | Return path for internal bias and ramp current; must be low-impedance for accurate timeout timing |
| 2 - VCC | Supply & threshold monitor input | Monitored rail; powers device and sets reset trigger point; valid down to 1.0V |
| 3 - N.C. | No internal connection | Unbonded die pad; may be tied to GND for mechanical stability but has no electrical function |
| 4 - SRT | Set Reset Timeout input | Connects to external timing capacitor; 240nA constant-current ramp source charges CSRT to 0.65V |
| 5 - RESET | Active-low open-drain output | Drives low during reset; requires external pullup (10kΩ–100kΩ) to any compatible logic supply (0–5.5V) |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise tailoring of reset hold time (275µs to >10ms) without firmware or external logic |
| Open-drain RESET with 5.5V tolerance | Permits direct interface to µPs with different I/O voltages (e.g., 1.8V core + 3.3V I/O) via single pullup |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset assertion even during severe brownout-critical for fail-safe embedded control |
| Immunity to short VCC transients | Rejects glitches ≤50µs at 100mV overdrive, eliminating false resets in noisy automotive/industrial environments |
| Laser-trimmed 2.313V threshold | Delivers ±2.5% accuracy over -40°C to +125°C-no calibration needed for 2.3V rail supervision |
Applications
| Battery-Powered Medical Sensors | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Continuous glucose monitor with coin-cell battery and ultra-low-power MCU. IC Role / Device Role / Timing Role: Supervises 2.3V LDO output; asserts open-drain RESET until VCC stabilizes post-battery insertion and timeout expires. Use Value: Prevents MCU boot corruption during weak-battery power-up; 1.6µA quiescent current extends sensor shelf life. | Use Scenario: Door-lock controller exposed to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Monitors 2.3V domain powering CAN transceiver and MCU; holds system in reset during <50µs VCC dips. Use Value: Eliminates spurious reboots caused by alternator noise; 2.313V threshold matches BCM rail spec. |
| Industrial Handheld Terminal | Smart Energy Meter |
Use Scenario: Ruggedized PDA with hot-swap battery and dual-voltage logic. IC Role / Device Role / Timing Role: Provides capacitor-programmable reset hold time while enabling RESET line to interface with both 1.8V MCU and 3.3V display driver. Use Value: Single MAX6425UK23 replaces discrete reset + level-shifter; open-drain output simplifies mixed-voltage design. | Use Scenario: Electricity meter operating from wide-input DC-DC with backup supercap. IC Role / Device Role / Timing Role: Supervises 2.3V RTC/metering ASIC supply; asserts RESET during brownout and maintains it for ≥10ms after recovery. Use Value: Configurable timeout ensures secure state save before power loss; 125°C rating supports transformer-coupled enclosure mounting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-monitoring reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP302HS23T1G | Fixed 2.3V threshold; 200ms min timeout (non-adjustable); push-pull output | Requires redesign for open-drain interface and timing flexibility; lacks transient immunity spec | Choose only if fixed timeout suffices and board layout allows push-pull drive |
| TLV803EB23DBZR | 2.32V threshold; 140ms min timeout; open-drain; higher 4.5µA ICC | Higher quiescent current reduces battery life; no published transient immunity data | Acceptable for non-battery apps where 2.8× higher ICC is tolerable |
Compared with MAX6425UK23, NCP302HS23T1G offers simpler BOM but sacrifices timing programmability and open-drain flexibility, while TLV803EB23DBZR matches the output type and threshold closely but doubles supply current and lacks documented glitch rejection-making MAX6425UK23 the optimal choice for long-life, noise-immune 2.3V supervision.
Availability
MAX6425UK23 is available at Aetrix Electronics and suitable for battery-powered medical sensors, automotive body control modules, industrial handheld terminals, smart energy meters, and portable instrumentation requiring stable component supply across extended temperature ranges.
Supply support for MAX6425UK23 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
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for demanding industrial, automotive, and medical applications.
The MAX6421–MAX6426 family delivers ultra-low-power, capacitor-programmable reset supervision for systems where supply voltage margins are tight and battery longevity is critical.
FAQ
What is the exact reset threshold voltage of the MAX6425UK23?
The MAX6425UK23 features a factory-laser-trimmed reset threshold of 2.313V, with ±2.5% accuracy over the full -40°C to +125°C operating range. This value is confirmed in Table 1 of the official datasheet and corresponds to the "23" suffix. The MAX6425UK23 does not require external calibration and maintains this precision across temperature and supply variations.
Does the MAX6425UK23 support capacitor-adjustable reset timeout, and how is it calculated?
Yes, the MAX6425UK23 supports capacitor-adjustable reset timeout via the SRT pin. The timeout period tRP (in seconds) is calculated as tRP = (2.73 × 10⁶) × CSRT + 275µs, where CSRT is in farads. For example, a 1500pF capacitor yields ~4.375ms timeout. The internal 240nA ramp current charges CSRT to 0.65V to deassert RESET - a key feature of the MAX6425UK23 architecture.
What is the recommended pullup resistor value for the open-drain RESET output of the MAX6425UK23?
A 10kΩ to 100kΩ external pullup resistor is recommended for the MAX6425UK23's open-drain RESET output. This range ensures reliable logic-high levels under all load conditions while minimizing current draw. The resistor connects between RESET and the target logic supply (0–5.5V). Lower values improve noise immunity; higher values reduce power - both are valid depending on system requirements for the MAX6425UK23 implementation.
Can the MAX6425UK23 operate reliably during fast VCC transients, and what is its immunity specification?
Yes, the MAX6425UK23 is specifically designed to reject short VCC transients. It remains immune to negative-going glitches ≤50µs in duration when the overdrive is 100mV below the 2.313V threshold - a key specification verified in the "Maximum Transient Duration vs. Reset Threshold Overdrive" graph. This makes the MAX6425UK23 suitable for automotive and industrial environments where supply noise is common.
Is the MAX6425UK23 pin-compatible with other devices in the MAX642x family or industry alternatives?
The MAX6425UK23 shares the same 5-pin SOT23-5 package and pinout as MAX6424, MAX6426, and MAX6340 - making it drop-in replaceable within that group. It is also explicitly stated as pin-compatible with NCP300–NCP303, MC33464/MC33465, S807/S808/S809, and RN5VD series devices. However, output type (open-drain) and threshold (2.313V) must be verified per application when substituting - the MAX6425UK23's compatibility is physical and functional only within these defined boundaries.
MAX6425UK23 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.313V
- 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
MAX6425UK23 FAQ
1.How can I place an order for MAX6425UK23 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6425UK23 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 MAX6425UK23 reliable?
The price and inventory of MAX6425UK23 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6425UK23 is usually 5 days.
3.What payment methods are accepted for MAX6425UK23?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6425UK23 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6425UK23?
MAX6425UK23 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6425UK23 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 MAX6425UK23?
For technical support, including MAX6425UK23 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6425UK23 requirements.
6.How does Aetrix verify that MAX6425UK23 is sourced from the original manufacturer or authorized distributors?
All MAX6425UK23 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 MAX6425UK23 meets industry standards.
7.What is the process for return or replacement of MAX6425UK23?
All MAX6425UK23 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6425UK23, 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 MAX6425UK23 part is unused and in its original packaging.
Return procedure for MAX6425UK23:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6425UK23 Tags
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