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Analog Devices Inc./Maxim Integrated MAX6426UK46
- Part No.:
- MAX6426UK46
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6426UK46.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:958
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Product details
Overview
MAX6426UK46 from Maxim Integrated is a low-power microprocessor supervisor IC with open-drain active-low reset output, 4.625V ±1.5% factory-trimmed reset threshold, capacitor-adjustable reset timeout (275µs to >5ms), and guaranteed operation down to VCC = 1V. It monitors supply voltage in battery-powered embedded controllers and ensures reliable µP reset during brownout conditions.
For engineers reviewing the MAX6426UK46 datasheet, MAX6426UK46 pinout, MAX6426UK46 application, or MAX6426UK46 equivalent, key selection criteria include its SOT23-5 open-drain output architecture, 1.6µA typical quiescent current at 2V, -40°C to +125°C operating range, and compatibility with multi-rail logic interfacing via external pullup.
Technical Context
The MAX6426UK46 implements a precision voltage-detection circuit with laser-trimmed internal resistors to set its 4.625V reset threshold, with ±1.5% accuracy at +25°C and ±2.5% over full temperature range. Its reset assertion is triggered by VCC falling below VTH, and deassertion requires both VCC rising above VTH and an externally timed delay governed by the SRT pin's 240nA ramp current charging CSRT.
This device uses a current-source–capacitor timing mechanism where tRP = 2.73×10⁶ × CSRT + 275µs, enabling precise, adjustable timeout periods from sub-millisecond to several milliseconds. The open-drain RESET output supports logic-level translation up to 5.5V and wired-OR configuration with auxiliary reset sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.625V ±1.5% at +25°C; ensures reliable detection of 5V rail undervoltage before system instability |
| Quiescent Current | 1.6µA typ at VCC ≤ 2.0V; enables multi-year battery life in portable medical or sensor nodes |
| Reset Timeout Range | 275µs (CSRT = 0) to 5.75ms (CSRT = 1500pF); covers µP power-up sequencing requirements across ARM Cortex-M and legacy 8-bit MCUs |
| Operating Voltage | 1.0V to 5.5V supply range; guarantees valid reset assertion even during deep brownout down to 1V |
| Temperature Range | -40°C to +125°C; qualified for under-hood automotive and industrial control environments |
| Output Type | Active-low open-drain RESET; allows level-shifting, wired-OR reset combining, and interface with 1.8V/3.3V/5V µP reset inputs |
| VCC to Reset Delay | 80µs maximum; provides fast response to supply collapse without false triggering on noise |
Pinout & Package
MAX6426UK46 is housed in a 5-pin SOT23-5 package (package code U5+2), RoHS-compliant, with exposed pad not electrically connected. Pin spacing is 0.95mm, body dimensions 2.9mm × 1.6mm × 1.1mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Ground reference | Primary return path for internal bias and SRT ramp current; must connect to low-impedance system ground plane |
| 2 - VCC | Supply and threshold monitor input | Monitored voltage rail; reset asserts when this pin falls below 4.625V; valid operation supported down to 1.0V |
| 3 - N.C. | No internal connection | Unbonded die pad; may be left floating or tied to GND for mechanical stability-no electrical function |
| 4 - SRT | Reset timeout capacitor interface | 240nA constant-current source charges external CSRT; timing accuracy depends on low-leakage ceramic capacitor selection |
| 5 - RESET | Active-low open-drain reset output | Drives low during reset; requires external pullup (10kΩ–100kΩ) to any voltage ≤5.5V for logic compatibility |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise tailoring of reset pulse width (275µs–5.75ms) to match specific µP requirements without firmware changes |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset behavior during severe brownout, preventing runaway code execution in safety-critical systems |
| Immunity to short VCC transients | Rejects glitches ≤50µs duration when VCC dips 100mV below threshold-reduces spurious resets in noisy power environments |
| Open-drain output with 5.5V tolerance | Permits direct interface to mixed-voltage systems (e.g., 3.3V µP with 5V I/O domain) and enables hardware reset arbitration |
| Laser-trimmed reset threshold | Delivers ±1.5% accuracy at room temperature, minimizing design margin and eliminating need for external resistor networks |
Applications
| Battery-Powered Medical Monitors | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Portable ECG or glucose meter operating from single Li-ion cell with dynamic load-induced voltage sag. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low RESET to ARM Cortex-M0+ MCU when battery drops below 4.625V, holding reset for ≥3ms until stable regulation resumes. Use Value: Prevents corrupted memory writes and sensor data loss during battery depletion, meeting IEC 60601-1 reliability requirements. |
Use Scenario: Under-dash BCM powered from vehicle battery subject to cranking transients and load-dump spikes. IC Role / Device Role / Timing Role: Monitors 5V LDO output; triggers open-drain RESET to Infineon AURIX™ TC3xx during brownout, synchronized with CAN bus error recovery. Use Value: Enables fail-safe shutdown and controlled restart without software intervention, supporting ISO 26262 ASIL-B functional safety goals. |
| Industrial Programmable Logic Controllers | Set-Top Box Power Management |
|
Use Scenario: DIN-rail mounted PLC with isolated 3.3V logic rail derived from wide-input DC-DC converter. IC Role / Device Role / Timing Role: Supervises 3.3V rail using 100nF CSRT to generate 4.375ms reset pulse, ensuring FPGA configuration completes before firmware boot. Use Value: Eliminates boot failures caused by marginal power-up sequencing, reducing field returns in harsh electromagnetic environments. |
Use Scenario: Hybrid broadcast broadband terminal with dual-rail SoC requiring coordinated 1.2V core and 3.3V I/O reset timing. IC Role / Device Role / Timing Role: Provides 4.625V threshold supervision of 5V standby rail; open-drain RESET pulled to 3.3V enables clean SoC reset independent of main 12V supply status. Use Value: Supports instant-on wake-from-standby while guaranteeing full hardware initialization before video decode begins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PST9246 | Same 4.6V reset threshold, SOT23-5, open-drain output; 2.5µA ICC vs. MAX6426UK46's 1.6µA; no guaranteed operation below 1.5V | Valid for commercial-temp applications only (0°C to +70°C); lacks AEC-Q100 qualification and extended temp support | Select PST9246 only for cost-sensitive consumer designs where ultra-low current and automotive temp range are non-critical |
| NCP302HS46T1G | 4.6V threshold, SOT23-5, open-drain; higher 4.5µA ICC; fixed 200ms timeout (not capacitor-adjustable) | Designed for fixed-delay reset in AC/DC adapters; unsuitable for µP with variable boot-time requirements | Choose NCP302HS46T1G only when a standardized long-duration reset pulse is required and timing flexibility is unnecessary |
Compared with PST9246 and NCP302HS46T1G, the MAX6426UK46 delivers superior low-power performance (1.6µA), wider operating temperature (-40°C to +125°C), capacitor-adjustable timeout, and guaranteed reset validity down to 1V-making it the optimal choice for battery-constrained and automotive-grade designs.
Availability
MAX6426UK46 is available at Aetrix Electronics and suitable for battery-powered medical monitors, automotive body control modules, and industrial programmable logic controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6426UK46 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, mixed-signal, and high-reliability semiconductor solutions for industrial, automotive, and computing markets.
The MAX6421–MAX6426 family delivers ultra-low-power, capacitor-programmable reset supervisors targeting space-constrained, battery-operated, and safety-critical embedded systems requiring deterministic power-on reset behavior.
FAQ
What is the exact reset threshold voltage of MAX6426UK46?
The MAX6426UK46 features a factory-laser-trimmed reset threshold of 4.625V, with ±1.5% accuracy at +25°C and ±2.5% over the full -40°C to +125°C operating range. This value is confirmed in Table 1 of the datasheet and corresponds to the "46" suffix in the part number. The MAX6426UK46 maintains this specification without external calibration.
Does MAX6426UK46 support operation below 1.6V supply voltage?
Yes, the MAX6426UK46 is fully specified to operate down to VCC = 1.0V, with guaranteed reset assertion and deassertion functionality. Its internal circuitry remains active and valid at 1V, unlike many supervisors that cease functioning below 1.6V. This capability is explicitly stated in the Absolute Maximum Ratings and Electrical Characteristics tables for MAX6426UK46.
Can MAX6426UK46 drive a 3.3V microcontroller reset input directly?
Yes, the MAX6426UK46's open-drain RESET output can interface directly with a 3.3V µP reset input when paired with a 3.3V pullup resistor (e.g., 47kΩ). Since the RESET pin tolerates voltages up to 6.0V and sinks current cleanly at VCC ≥ 1.8V, it meets standard 3.3V CMOS logic thresholds. No level-shifter is needed for MAX6426UK46 in this configuration.
What capacitor value sets a 4.375ms reset timeout for MAX6426UK46?
A 1500pF capacitor (CSRT) connected between the SRT pin and GND yields a nominal reset timeout of 4.375ms for MAX6426UK46, as specified in the Electrical Characteristics table under tRP conditions. This value is validated across temperature and process variation, and ceramic capacitors with <10nA leakage are recommended for MAX6426UK46 timing accuracy.
Is MAX6426UK46 pin-compatible with any industry-standard alternatives?
Yes, the MAX6426UK46 is documented as pin-compatible with PST92XX-series supervisors (e.g., PST9246) in the Benefits and Features section of the datasheet. Both use identical 5-pin SOT23-5 packaging, matching pin 1 (GND), pin 2 (VCC), pin 4 (SRT), and pin 5 (RESET) assignments-enabling drop-in replacement where timing and temperature requirements align.
MAX6426UK46 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:
- 4.625V
- 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
MAX6426UK46 FAQ
1.How can I place an order for MAX6426UK46 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6426UK46 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 MAX6426UK46 reliable?
The price and inventory of MAX6426UK46 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6426UK46 is usually 5 days.
3.What payment methods are accepted for MAX6426UK46?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6426UK46 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6426UK46?
MAX6426UK46 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6426UK46 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 MAX6426UK46?
For technical support, including MAX6426UK46 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6426UK46 requirements.
6.How does Aetrix verify that MAX6426UK46 is sourced from the original manufacturer or authorized distributors?
All MAX6426UK46 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 MAX6426UK46 meets industry standards.
7.What is the process for return or replacement of MAX6426UK46?
All MAX6426UK46 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6426UK46, 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 MAX6426UK46 part is unused and in its original packaging.
Return procedure for MAX6426UK46:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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