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Analog Devices Inc./Maxim Integrated MAX6419UK46+
- Part No.:
- MAX6419UK46+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6419UK46+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,200
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Product details
Overview
MAX6419UK46+ from Maxim Integrated is a low-power dual-voltage microprocessor supervisor IC in SOT23-5 package, featuring a factory-trimmed 4.625V fixed VCC reset threshold and an adjustable RESET IN input (1.26V reference) for monitoring secondary voltages down to 1.26V. It provides active-high push-pull RESET output with capacitor-adjustable timeout (275µs to 5.75ms), 1.7µA typical quiescent current at 2V, and guaranteed operation from -40°C to +125°C - used in automotive engine control units to monitor both main 5V supply and auxiliary 3.3V rail.
For engineers reviewing the MAX6419UK46+ datasheet, MAX6419UK46+ pinout, MAX6419UK46+ application, or MAX6419UK46+ equivalent, key selection considerations include its dual-threshold architecture, AEC-Q100 qualification (per /V variants), SRT capacitor-based timeout tuning, and compatibility with brownout detection in battery-powered embedded controllers requiring stable reset assertion during voltage transients.
Technical Context
The MAX6419UK46+ integrates two independent reset comparators: one laser-trimmed for VCC monitoring at 4.625V (±2.5% over temperature), and a second high-impedance adjustable input referenced to 1.26V for external resistor-divider–based monitoring of secondary supplies. Its reset timeout is generated by a 240nA internal current source charging an external capacitor (SRT pin) to a 0.65V threshold, enabling precise delay programming from 275µs to >5ms.
It asserts an active-high RESET signal when either VCC falls below 4.625V or the voltage at RESET IN drops below its programmed threshold (e.g., 3.3V via R1/R2 divider), and holds RESET high for the full timeout period after both conditions recover. The push-pull output drives up to 800µA at VCC ≥ 4.5V with VOH ≥ 0.8×VCC and VOL ≤ 0.4V, ensuring robust logic-level compatibility with modern µPs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Fixed VCC Threshold | 4.625V ±2.5% over -40°C to +125°C - ensures reliable power-on reset for 5V systems with margin against ripple and drift. |
| Adjustable Input Reference | 1.26V internal reference - enables precise monitoring of secondary rails (e.g., 3.3V, 2.5V) using external resistors without trimming. |
| Reset Timeout Range | 275µs to 5.75ms (CSRT = 0F to 1500pF) - supports µP reset timing requirements from fast-boot MCUs to legacy processors. |
| Quiescent Current | 1.7µA typ at VCC = 2.0V - minimizes battery drain in always-on automotive and portable applications. |
| Operating Temperature | -40°C to +125°C - meets extended industrial and automotive under-hood environmental requirements. |
| RESET Output Type | Active-high push-pull - eliminates need for external pull-up, simplifies interface to µP reset inputs requiring high-true assertion. |
| VCC Supply Range | 1.0V to 5.5V - guarantees valid RESET output even during deep brownout (down to 1V), critical for fail-safe sequencing. |
Pinout & Package
SOT23-5 package: ultra-compact surface-mount outline (2.9mm × 1.6mm × 1.1mm), thermally enhanced for high-reliability automotive and industrial use. RoHS-compliant lead-free (+) variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-high push-pull reset output | Drives µP reset pin directly; sinks 3.2mA at 4.5V, sources 800µA; no external pull-up required. |
| 2 - GND | Ground reference | Common return for all internal circuitry and external capacitor (SRT); must be low-impedance for accurate timeout timing. |
| 3 - RESET IN | Adjustable reset comparator input | High-impedance node (≤10nA leakage); connects to center tap of resistor divider to set secondary voltage threshold. |
| 4 - SRT | Set Reset Timeout input | 240nA precision current source pin; connects to ground via timing capacitor (CSRT); sensitive to stray capacitance/leakage. |
| 5 - VCC | Main supply and fixed-threshold monitor input | Powers device and feeds fixed 4.625V comparator; valid reset assertion guaranteed down to 1.0V supply. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises primary VCC (4.625V) and secondary rail (e.g., 3.3V) with separate comparators - eliminates need for two discrete supervisors. |
| Capacitor-programmable reset timeout | External CSRT sets delay from 275µs to 5.75ms with ±15% accuracy - replaces fixed-delay ICs and avoids firmware-based timing dependencies. |
| AEC-Q100 qualified variants available | /V suffix parts meet stress test requirements for automotive electronics - validated for life-cycle reliability in engine control, ADAS, and body modules. |
| Low-voltage operation guarantee | RESET remains valid and asserted until VCC ≥ 1.0V - ensures deterministic behavior during deep undervoltage events common in start-stop systems. |
| Power-supply transient immunity | Rejects VCC glitches ≤50µs at 100mV overdrive - prevents spurious resets caused by switching noise or load dump transients. |
Applications
| Engine Control Unit (ECU) | Medical Infusion Pump |
|---|---|
Use Scenario: Monitors 5V main supply and 3.3V microcontroller I/O rail during cold cranking (VCC dips to 6.5V) and load dump (transient spikes). IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting active-high RESET to ARM Cortex-M7 MCU, with 4.375ms timeout set by 1500pF SRT capacitor. Use Value: Prevents code corruption during voltage sags by holding MCU in reset until both rails stabilize above thresholds - meeting ISO 16750-2 pulse 4 compliance. | Use Scenario: Ensures safe power-up sequencing of motor driver, ADC, and wireless SoC in battery-operated infusion device with Li-ion (2.7–4.2V) input. IC Role / Device Role / Timing Role: Supervises 3.3V system rail (via RESET IN divider) and 1.8V analog supply (via VCC pin with 1.8V threshold variant), generating synchronized reset. Use Value: Guarantees zero-reset-failure startup across battery discharge curve and temperature extremes (-20°C to +50°C), satisfying IEC 62304 Class C software safety requirements. |
| Industrial PLC I/O Module | Automotive Telematics Gateway |
Use Scenario: Detects undervoltage on isolated 24V-to-5V DC/DC output and 3.3V FPGA core rail in harsh factory environments with EMI. IC Role / Device Role / Timing Role: Dual-input supervisor with 1.7µA ICC enabling 10-year battery backup runtime; SRT capacitor selected for 2ms timeout. Use Value: Eliminates false resets from conducted noise while maintaining <1µA standby current - extends supercapacitor hold-up time during AC loss. | Use Scenario: Monitors 5V CAN transceiver supply and 1.2V processor core rail in LTE/V2X gateway exposed to automotive thermal cycling (-40°C to +105°C). IC Role / Device Role / Timing Role: AEC-Q100 qualified MAX6419UK46+/V variant provides active-high RESET to NXP S32K144, with timeout tuned for bootloader execution window. Use Value: Enables fail-safe boot abort if either rail collapses during ignition cycle - critical for ASIL-B functional safety decomposition. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Fixed 3.3V VDD threshold only; no adjustable input - single-rail monitoring only. | Lacks dual-voltage capability; requires external resistor network or second IC for secondary rail. | Select only if monitoring one supply; MAX6419UK46+ preferred when dual-rail supervision reduces BOM count and board space. |
| ADM6315-46ARTZ-R7 | Fixed 4.63V threshold, open-drain RESET output - requires external pull-up and cannot drive heavy loads directly. | No adjustable input; incompatible with systems needing active-high push-pull interface without level-shifting. | Choose only for legacy designs using open-drain buses; MAX6419UK46+ offers superior integration and drive strength. |
Compared with TPS3808G33DBVR and ADM6315-46ARTZ-R7, the MAX6419UK46+ uniquely combines fixed + adjustable thresholds in one SOT23-5 package with active-high push-pull output, reducing component count and eliminating external biasing - essential for space-constrained automotive and medical PCBs where dual-rail integrity is non-negotiable.
Availability
MAX6419UK46+ is available at Aetrix Electronics and suitable for automotive engine control units, medical infusion pumps, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6419UK46+ 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 power management ICs for demanding industrial, automotive, and medical applications.
The MAX6412–MAX6420 family delivers low-power, capacitor-tunable microprocessor supervisors optimized for dual-rail voltage monitoring in safety-critical embedded systems where reliability across extreme temperatures and transient immunity are mandatory.
FAQ
What is the exact fixed reset threshold voltage of the MAX6419UK46+?
The MAX6419UK46+ has a factory-laser-trimmed fixed VCC reset threshold of 4.625V, with ±1.25% accuracy at +25°C and ±2.5% over the full -40°C to +125°C operating range. This value corresponds to the "46" suffix per Maxim's Reset Voltages Suffix Table, confirming nominal 4.625V (min 4.509V, max 4.741V).
Does the MAX6419UK46+ support manual reset functionality?
No, the MAX6419UK46+ does not include a manual reset (MR) input. Per the Selector Guide and Pin Description, only MAX6412/MAX6413/MAX6414 and MAX6418/MAX6420 variants feature MR; MAX6419UK46+ belongs to the fixed + adjustable input group without MR, relying solely on VCC and RESET IN monitoring.
How do I calculate the SRT capacitor value for a 3.5ms reset timeout with the MAX6419UK46+?
Use the formula CSRT = (tRP − 275µs) / 2.71×10⁶, where tRP = 3.5ms = 0.0035s. Thus CSRT = (0.0035 − 0.000275) / 2,710,000 ≈ 1190pF. A standard 1200pF ceramic capacitor yields ~3.52ms timeout, well within the ±15% tolerance band specified for the MAX6419UK46+.
Is the MAX6419UK46+ qualified for automotive applications?
The base MAX6419UK46+ is not AEC-Q100 qualified; however, the /V automotive-grade variant (e.g., MAX6419UK46/V+T) is explicitly listed in the Ordering Information as AEC-Q100 qualified. Always specify the /V suffix and +T tape-and-reel packaging when automotive qualification is required for the MAX6419UK46+.
What is the maximum leakage current specification for the RESET IN pin of the MAX6419UK46+?
The RESET IN pin leakage current for the MAX6419UK46+ is specified as ≤10nA (maximum) across the full temperature range, per the Electrical Characteristics table. This ultra-low leakage enables use of high-value resistor dividers (e.g., 1MΩ/1MΩ) without degrading threshold accuracy - critical for battery-powered applications.
MAX6419UK46+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.625V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6419UK46+ FAQ
1.How can I place an order for MAX6419UK46+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6419UK46+ 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 MAX6419UK46+ reliable?
The price and inventory of MAX6419UK46+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6419UK46+ is usually 5 days.
3.What payment methods are accepted for MAX6419UK46+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6419UK46+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6419UK46+?
MAX6419UK46+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6419UK46+ 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 MAX6419UK46+?
For technical support, including MAX6419UK46+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6419UK46+ requirements.
6.How does Aetrix verify that MAX6419UK46+ is sourced from the original manufacturer or authorized distributors?
All MAX6419UK46+ 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 MAX6419UK46+ meets industry standards.
7.What is the process for return or replacement of MAX6419UK46+?
All MAX6419UK46+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6419UK46+, 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 MAX6419UK46+ part is unused and in its original packaging.
Return procedure for MAX6419UK46+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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