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Analog Devices Inc./Maxim Integrated MAX6425UK34-T
- Part No.:
- MAX6425UK34-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6425UK34-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6425UK34-T from Maxim Integrated is a low-power, open-drain microprocessor reset supervisor IC designed for precise VCC monitoring and capacitor-adjustable reset timeout in space-constrained systems. It features a factory-trimmed 3.4V reset threshold (±2.5% over -40°C to +125°C), 1.6µA typical quiescent current, guaranteed reset validity down to VCC = 1V, and operates across 1.6V–5.5V supply range. It is used in battery-powered controllers and automotive ECUs requiring reliable power-on reset with flexible timing.
For engineers reviewing the MAX6425UK34-T datasheet, MAX6425UK34-T pinout, MAX6425UK34-T application, or MAX6425UK34-T equivalent, key selection criteria include its SOT23-5 open-drain output architecture, capacitor-programmable reset timeout (275µs base + 2.73×10⁶·CSRT), ±2.5% threshold accuracy over temperature, and compatibility with multi-rail logic interfaces via external pullup.
Technical Context
The MAX6425UK34-T implements a precision voltage detector with laser-trimmed internal reference and hysteresis (4×VTH), coupled to a 240nA constant-current ramp generator that charges an external capacitor on the SRT pin. Reset assertion occurs when VCC falls below 3.4V; deassertion requires both VCC > 3.4V and SRT capacitor voltage ramping to 0.65V.
Its open-drain RESET output supports wired-OR configuration and logic-level translation-compatible with any pullup supply from 0V to 5.5V-and remains functional down to VCC = 1V, enabling robust operation during brownout recovery. Immunity to transients ≤50µs at 100mV overdrive is specified per Typical Operating Characteristics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.40V ±2.5% over -40°C to +125°C - ensures deterministic reset initiation at defined system rail level |
| Quiescent Current | 1.6µA typical at +25°C - enables multi-year battery life in portable and remote sensor applications |
| Supply Range | 1.6V to 5.5V - supports direct monitoring of 1.8V, 2.5V, 3.3V, and 5V rails without external scaling |
| Reset Timeout Base | 275µs minimum (CSRT = 0) - guarantees minimum reset pulse width even with no external capacitor |
| SRT Ramp Current | 240nA ±20% - sets linear charging rate for external capacitor, enabling predictable timeout adjustment |
| VCC to Reset Delay | 80µs maximum (VCC falling at 1mV/µs) - ensures fast response to supply collapse before processor corruption |
| RESET Output Type | Open-drain - allows bidirectional logic interfacing, wired-OR reset combining, and multi-supply compatibility |
Pinout & Package
MAX6425UK34-T is housed in a 5-pin SOT23-5 package (outline 21-0057), with 1.3mm × 2.9mm footprint and 0.95mm height, optimized for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Ground reference | Primary return path for internal bias and SRT ramp current; must be low-impedance connection |
| 2 - VCC | Supply and threshold monitor input | Monitored rail input; reset asserts when voltage drops below 3.4V; valid operation down to 1.0V |
| 3 - N.C. | No internal connection | Unused pin; may be left floating or tied to GND per layout best practice; no electrical function |
| 4 - SRT | Set Reset Timeout input | Connects to external capacitor (CSRT); 240nA current source charges CSRT to set timeout period |
| 5 - RESET | Open-drain reset output | Active-low signal; requires external pullup (10kΩ–100kΩ); sinks ≥50µA at VCC ≥1.0V |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | tRP = 2.73×10⁶·CSRT + 275µs - enables precise, application-specific reset hold time from ~300µs to >1s using standard ceramic capacitors |
| Guaranteed reset validity to VCC = 1V | RESET output remains functional and logic-valid down to 1.0V supply - prevents undefined state during deep brownout recovery |
| Immunity to short VCC transients | No false reset for ≤50µs glitches at 100mV overdrive - eliminates spurious resets caused by switching noise or load dumps |
| Multi-rail logic interface support | Open-drain output compatible with pullup supplies from 0V to 5.5V - enables direct interface to 1.2V, 1.8V, 3.3V, or 5V µP reset inputs |
| Laser-trimmed threshold accuracy | ±2.5% over full temperature range - eliminates need for external calibration or margining in safety-critical monitoring |
Applications
| Battery-Powered Controllers | Automotive Body Control Modules |
|---|---|
|
Use Scenario: A handheld medical glucose meter uses coin-cell power and must guarantee clean boot after battery insertion or voltage sag. IC Role / Device Role / Timing Role: MAX6425UK34-T monitors the 3.3V LDO output and asserts open-drain RESET until stable, with timeout set to 100ms via 33nF SRT capacitor. Use Value: Prevents firmware execution before regulator stabilization; 1.6µA quiescent current extends shelf life beyond 5 years. |
Use Scenario: An automotive door module experiences load-dump transients on its 5V supply rail during alternator regulation events. IC Role / Device Role / Timing Role: MAX6425UK34-T supervises the 5V microcontroller rail, ignoring <50µs dips while asserting reset for sustained brownouts below 3.4V. Use Value: Eliminates MCU lockup without requiring transient suppressors on every subsystem rail. |
| Industrial Sensor Nodes | Medical Infusion Pumps |
|
Use Scenario: A wireless temperature sensor node sleeps at 1.8V and wakes periodically; supply voltage may dip near brownout threshold during RF transmission. IC Role / Device Role / Timing Role: MAX6425UK34-T monitors the 1.8V rail and holds µC in reset for 200ms after voltage recovers, ensuring full clock stabilization before wake-up sequence. Use Value: Avoids corrupted ADC readings or missed BLE advertisements due to premature wake-up. |
Use Scenario: A Class II medical infusion pump requires fail-safe power sequencing: motor driver must not activate until MCU confirms safe state. IC Role / Device Role / Timing Role: MAX6425UK34-T provides hardware-enforced reset hold time synchronized to 3.3V rail rise, with RESET pulled up to 5V for motor driver enable logic. Use Value: Enables independent logic-voltage domains while maintaining deterministic power-up order and IEC 62304 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP302LSN34T1G | Fixed 3.4V threshold, 1.2µA IQ, SOT23-5, open-drain, but no capacitor-adjustable timeout (fixed 200ms) | Lacks programmable timeout; suitable only where fixed delay suffices and ultra-low IQ is critical | Choose NCP302LSN34T1G if timeout flexibility is unnecessary and sub-1.5µA current is mandatory. |
| TLV803EB34DBZR | 3.4V threshold, 0.5µA IQ, SOT23-5, open-drain, fixed 200ms timeout, higher accuracy (±0.5%) but no adjustable timing | Superior threshold accuracy and lower IQ, but no SRT pin - cannot adapt timeout to µP reset requirements | Choose TLV803EB34DBZR for high-precision, ultra-low-power applications where fixed 200ms is acceptable. |
Compared with NCP302LSN34T1G and TLV803EB34DBZR, the MAX6425UK34-T uniquely delivers field-programmable reset timeout via external capacitor while maintaining competitive quiescent current and automotive-grade temperature range - essential when µP startup sequences vary across product variants or require post-design tuning.
Availability
MAX6425UK34-T is available at Aetrix Electronics and suitable for battery-powered controllers, automotive body electronics, and medical infusion pumps requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX6425UK34-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
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in analog, mixed-signal, and power-management ICs for industrial, automotive, and computing applications.
The MAX6421–MAX6426 family was designed specifically for low-power, capacitor-configurable reset supervision in space- and energy-constrained systems - targeting portable, automotive, and medical devices where precision, flexibility, and reliability are non-negotiable.
FAQ
What is the exact reset threshold voltage of MAX6425UK34-T?
The MAX6425UK34-T has a factory-trimmed nominal reset threshold of 3.40V, with guaranteed accuracy of ±2.5% over the full operating temperature range (-40°C to +125°C). This value is laser-trimmed during production and confirmed in the Electrical Characteristics table under "VCC Reset Threshold Accuracy" with VTH = 3.4V.
How do I calculate the reset timeout period for MAX6425UK34-T?
The reset timeout period tRP for MAX6425UK34-T is calculated as tRP = (2.73 × 10⁶) × CSRT + 275µs, where CSRT is the capacitance (in farads) connected between the SRT pin and GND. For example, a 33nF capacitor yields tRP ≈ 91ms. The formula is derived from the 240nA internal ramp current and 0.65V trip threshold.
Can MAX6425UK34-T drive a 5V microcontroller reset input from a 3.3V supply system?
Yes. The MAX6425UK34-T features an open-drain RESET output, allowing an external pullup resistor to any voltage rail up to 5.5V. When used in a 3.3V system, connect the pullup to 5V - the output will sink current to assert RESET low and float high to allow the 5V rail to define the logic-high level, enabling seamless cross-rail interfacing.
Is MAX6425UK34-T qualified for automotive applications?
The MAX6425UK34-T is rated for -40°C to +125°C operation and meets automotive ambient requirements, but it is not explicitly AEC-Q100 qualified. For automotive applications requiring formal qualification, select the /V suffix variant (e.g., MAX6425UK34-V+T), which undergoes additional stress testing and screening per AEC-Q100 Rev H.
What capacitor type is recommended for the SRT pin on MAX6425UK34-T?
A low-leakage ceramic capacitor is recommended for the SRT pin on MAX6425UK34-T, with leakage <10nA. X7R or C0G dielectrics are preferred; avoid high-leakage types like Y5V or electrolytic. Typical values range from 1nF to 100nF, yielding timeouts from ~300µs to ~270ms. Keep SRT traces short and away from noisy signals to prevent timing errors.
MAX6425UK34-T 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:
- 3.4V
- 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
MAX6425UK34-T FAQ
1.How can I place an order for MAX6425UK34-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6425UK34-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 MAX6425UK34-T reliable?
The price and inventory of MAX6425UK34-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6425UK34-T is usually 5 days.
3.What payment methods are accepted for MAX6425UK34-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6425UK34-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6425UK34-T?
MAX6425UK34-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6425UK34-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 MAX6425UK34-T?
For technical support, including MAX6425UK34-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6425UK34-T requirements.
6.How does Aetrix verify that MAX6425UK34-T is sourced from the original manufacturer or authorized distributors?
All MAX6425UK34-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 MAX6425UK34-T meets industry standards.
7.What is the process for return or replacement of MAX6425UK34-T?
All MAX6425UK34-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6425UK34-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 MAX6425UK34-T part is unused and in its original packaging.
Return procedure for MAX6425UK34-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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