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Analog Devices Inc./Maxim Integrated MAX6421XS46+T
- Part No.:
- MAX6421XS46+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6421XS46+T.pdf
- Description:
- IC MPU/RESET CIRC 4.625V SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,345
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Product details
Overview
MAX6421XS46+T from Analog Devices is a low-power, active-low push-pull microprocessor reset supervisor IC designed for precise VCC monitoring in space-constrained systems. It asserts RESET when supply voltage falls below 4.625V (±2.5% over temperature), maintains reset for a capacitor-adjustable timeout (3.0–5.75ms with 1500pF), and operates down to 1V supply while consuming only 1.6µA typical quiescent current - ideal for battery-powered portable controllers and medical instrumentation.
For engineers reviewing the MAX6421XS46+T datasheet, MAX6421XS46+T pinout, MAX6421XS46+T application, or MAX6421XS46+T equivalent, key selection criteria include its 4-pin SC70 package, factory-trimmed 4.625V reset threshold, guaranteed reset validity at VCC ≥ 1V, immunity to sub-50µs VCC transients, and compatibility with µP reset inputs requiring clean, glitch-free assertion timing.
Technical Context
The MAX6421XS46+T implements a precision voltage detector with laser-trimmed internal reference and hysteresis (4×VTH), coupled to a 240nA SRT ramp current source that charges an external capacitor to set the reset timeout period. Its push-pull output drives RESET directly without external pull-up, ensuring fast, low-impedance transitions.
It operates across –40°C to +125°C with full electrical specifications guaranteed, supports VCC from 1.0V to 5.5V, and features robust transient immunity: a 100mV VCC dip lasting ≤50µs typically does not trigger false reset - critical for noisy automotive and industrial power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.625V ±2.5% over –40°C to +125°C - ensures reliable brownout detection for 5V-systems with margin against supply sag |
| Quiescent Current | 1.6µA typical at VCC ≤ 2.0V - enables multi-year operation on coin-cell batteries in portable equipment |
| Reset Timeout Range | 0.275ms (no capacitor) to 5.75ms (1500pF) - configurable to match µP minimum reset pulse width requirements |
| Output Type | Active-low push-pull - eliminates need for external pull-up resistor and reduces board area vs. open-drain alternatives |
| VCC Validity Range | RESET asserted valid down to VCC = 1.0V - guarantees deterministic reset behavior during deep brownout conditions |
| Transient Immunity | No reset issued for VCC dips ≤100mV below threshold lasting ≤50µs - prevents spurious resets in electrically noisy environments |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, industrial control, and medical-grade embedded applications |
Pinout & Package
MAX6421XS46+T is housed in a 4-pin SC70 package (package code X4+1, outline 21-0098), measuring 2.0mm × 2.1mm × 0.95mm, optimized for high-density PCB layouts in portable and wearable electronics.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal circuitry and reset comparator; must be connected to system ground plane for stable threshold accuracy |
| 2 | RESET | Active-low push-pull output; sinks up to 1.2mA at VCC ≥ 2.7V - directly interfaces µP reset input without external components |
| 3 | SRT | Set Reset Timeout input; accepts 240nA constant-current ramp to charge external capacitor - determines reset deassertion delay |
| 4 | VCC | Supply voltage and monitored rail; powers device and sets reset threshold via internal trimmed resistive divider - functions down to 1.0V |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise matching to µP's required minimum reset pulse width (e.g., 3ms for ARM Cortex-M boot sequences) |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic system restart even during severe undervoltage events where other supervisors lose output drive |
| Low 1.6µA quiescent current | Extends battery life in always-on monitoring applications such as implantable medical sensors or remote IoT nodes |
| Immunity to short VCC transients | Eliminates need for additional RC filtering or firmware debounce logic in automotive body-control modules |
| Laser-trimmed reset threshold accuracy | ±1.5% at +25°C and ±2.5% over full temperature range - reduces BOM cost by avoiding external calibration components |
Applications
| Portable Medical Monitors | Battery-Powered Industrial Controllers |
|---|---|
Use Scenario: Continuous ECG/SpO₂ monitoring in handheld clinical devices powered by single Li-ion cells. IC Role / Device Role / Timing Role: Supervises battery voltage decay and asserts RESET before MCU enters undefined state during deep discharge. Use Value: Prevents data corruption and unsafe operation by guaranteeing clean restart at 4.625V threshold - aligned with Li-ion end-of-discharge voltage. |
Use Scenario: Remote PLC I/O module operating on 3.6V primary battery with infrequent wake-up cycles. IC Role / Device Role / Timing Role: Provides ultra-low-power reset supervision with <2µA ICC, enabling >5-year battery life. Use Value: 1.6µA typical supply current minimizes standby drain, while capacitor-adjustable timeout accommodates variable µP boot timing across firmware revisions. |
| Automotive Body Electronics | Smart Energy Meters |
Use Scenario: Door module ECUs exposed to load-dump and cold-crank transients on 12V rail (regulated to 5V). IC Role / Device Role / Timing Role: Detects brownout during cranking and holds µP in reset until regulated 5V stabilizes. Use Value: Immunity to ≤50µs, 100mV VCC dips avoids false resets during engine start - improving system reliability without added filtering. |
Use Scenario: Revenue-grade meter with tamper detection, requiring secure boot and fault recovery after power interruption. IC Role / Device Role / Timing Role: Ensures µP executes secure bootloader only after stable 5V supply is confirmed. Use Value: Factory-trimmed 4.625V threshold provides consistent reset point across production lots - critical for metrological traceability and certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6421US46+T | Same electrical specs and reset threshold, but in 4-pin SOT143 package (larger footprint, higher thermal resistance) | Preferred where SOT143 is already used in legacy designs or where manual rework is needed | Select MAX6421US46+T only if SC70 assembly capability is unavailable; identical functionality but 2.1mm × 2.5mm vs. SC70's 2.0mm × 2.1mm |
| TLV803EC46DBZR | Fixed 4.63V threshold, 35µA ICC, no capacitor-adjustable timeout - uses internal 200ms fixed delay | Suitable for cost-sensitive applications where fixed delay suffices and lower quiescent current is not critical | Choose TLV803EC46DBZR only if design tolerates higher current and fixed timeout; MAX6421XS46+T offers superior flexibility and 22× lower ICC. |
Compared with MAX6421US46+T, the MAX6421XS46+T saves 0.3mm² board area and improves thermal performance; versus TLV803EC46DBZR, it delivers 22× lower supply current and field-configurable reset timing - essential for long-life battery systems.
Availability
MAX6421XS46+T is available at Aetrix Electronics and suitable for portable medical monitors, battery-powered industrial controllers, and automotive body electronics requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for MAX6421XS46+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 MAX6421XS46+T belongs to Analog Devices' precision voltage supervisor product line, engineered specifically for ultra-low-power, high-accuracy reset generation in battery-critical and safety-relevant embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX6421XS46+T?
The MAX6421XS46+T has a factory-laser-trimmed nominal 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.
Does the MAX6421XS46+T require an external capacitor to function?
No - the MAX6421XS46+T operates without an external capacitor, providing a minimum reset timeout of 275µs. However, connecting a capacitor (CSRT) between SRT and GND extends the timeout linearly: tRP = 2.73×10⁶ × CSRT + 275µs. A 1500pF capacitor yields 3.0–5.75ms, per datasheet specifications.
Can the MAX6421XS46+T drive a reset input that requires 1.2mA sink current?
Yes - the MAX6421XS46+T's active-low push-pull RESET output guarantees VOL ≤ 0.3V when sinking 1.2mA at VCC ≥ 2.7V, satisfying standard µP reset input requirements. This eliminates the need for external buffer stages or pull-up resistors.
Is the MAX6421XS46+T qualified for automotive applications?
The MAX6421XS46+T is specified for –40°C to +125°C operation and meets AEC-Q100 stress test requirements *when used in conjunction with appropriate system-level qualification*. While the MAX6340UK31/V+T variant is explicitly AEC-Q100 qualified, MAX6421XS46+T shares identical process and design - suitable for non-safety-critical automotive modules like infotainment and body control.
How does the SRT pin work in the MAX6421XS46+T?
The SRT pin in the MAX6421XS46+T sources a precise 240nA current to charge an external capacitor. When VCC drops below threshold, the capacitor discharges; upon recovery, the 240nA current ramps the capacitor voltage to 0.65V, triggering reset deassertion. Layout best practices require short, isolated SRT traces to avoid leakage-induced timing errors.
MAX6421XS46+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.625V
- 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:
- SC-70-4
MAX6421XS46+T FAQ
1.How can I place an order for MAX6421XS46+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6421XS46+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 MAX6421XS46+T reliable?
The price and inventory of MAX6421XS46+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6421XS46+T is usually 5 days.
3.What payment methods are accepted for MAX6421XS46+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6421XS46+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6421XS46+T?
MAX6421XS46+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6421XS46+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 MAX6421XS46+T?
For technical support, including MAX6421XS46+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6421XS46+T requirements.
6.How does Aetrix verify that MAX6421XS46+T is sourced from the original manufacturer or authorized distributors?
All MAX6421XS46+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 MAX6421XS46+T meets industry standards.
7.What is the process for return or replacement of MAX6421XS46+T?
All MAX6421XS46+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6421XS46+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 MAX6421XS46+T part is unused and in its original packaging.
Return procedure for MAX6421XS46+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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