My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6425UK46+T
- Part No.:
- MAX6425UK46+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6425UK46+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:257
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6425UK46+T from Analog Devices is a low-power microprocessor supervisor IC with open-drain active-low reset output, 4.625V ±2.5% factory-trimmed reset threshold, capacitor-adjustable reset timeout (275µs to 5.75ms), and guaranteed operation down to VCC = 1V. It monitors system supply voltage in portable, automotive, and medical equipment to prevent erroneous µP execution during brownout or power-up.
For engineers reviewing the MAX6425UK46+T datasheet, MAX6425UK46+T pinout, MAX6425UK46+T application, or MAX6425UK46+T equivalent, key selection criteria include its SOT23-5 open-drain RESET output, 1.6µA typical quiescent current, -40°C to +125°C operating range, and compatibility with multi-rail logic interfacing via external pullup.
Technical Context
The MAX6425UK46+T implements a precision voltage detector using laser-trimmed resistors to set its 4.625V reset threshold with ±2.5% accuracy over temperature. Its reset assertion is triggered by VCC falling below this threshold, with hysteresis of 4×VTH (≈18.5mV) to prevent chatter near the trip point.
Reset deassertion timing is controlled by an internal 240nA current source charging an external capacitor (CSRT) on the SRT pin to a 0.65V ramp threshold; the resulting timeout period ranges from 275µs (CSRT = 0) to 5.75ms (CSRT = 1500pF), fully specified across -40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.625V ±2.5% at -40°C to +125°C - ensures reliable brownout detection for 5V systems with margin against ripple and drift |
| Quiescent Current | 1.6µA typ at VCC ≤ 2.0V - enables multi-year battery life in always-on monitoring applications |
| Reset Timeout Range | 275µs to 5.75ms (CSRT = 0 to 1500pF) - supports µP reset hold times from fast-boot controllers to legacy processors |
| Operating Voltage | 1.0V to 5.5V - guarantees valid RESET output even during deep brownout conditions before system collapse |
| Output Type | Active-low open-drain - allows wired-OR reset combining and logic-level translation up to 5.5V via external pullup |
| VCC to Reset Delay | 80µs max at 1mV/µs VCC fall rate - provides deterministic response to rapid supply collapse |
| Package | 5-pin SOT23-5 - surface-mount footprint compatible with high-density PCB layouts and automated assembly |
Pinout & Package
MAX6425UK46+T is housed in a 5-pin SOT23-5 package with exposed pad (not electrically connected), 1.6mm × 2.9mm body size, and 0.95mm pitch. Pin 1 is marked with a dot; pin numbering follows standard SOT23 convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SRT | Reset timeout capacitor input | Accepts external capacitor (CSRT) to set precise reset hold time; sensitive to leakage and stray capacitance |
| 2 - GND | Ground reference | Primary return path for internal circuitry and SRT ramp current; must be low-impedance |
| 3 - N.C. | No internal connection | Not bonded; may be left floating or tied to GND per layout best practice-no functional impact |
| 4 - VCC | Supply voltage and threshold monitor input | Monitors system rail; device operates and asserts RESET only when VCC ≥ 1.0V |
| 5 - RESET | Active-low open-drain reset output | Sinks current when asserted; requires external pullup (10kΩ–100kΩ) to any logic rail ≤5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise tailoring of reset hold time (275µs–5.75ms) without firmware or external logic |
| Guaranteed RESET validity to VCC = 1V | Ensures deterministic reset behavior during deep undervoltage events where most supervisors fail |
| Immunity to short VCC transients | Rejects glitches ≤50µs duration when VCC dips 100mV below threshold-reduces false resets |
| Open-drain output with 5.5V tolerance | Permits direct interface to µPs with different I/O voltages (e.g., 3.3V µP with 5V system rail) |
| Laser-trimmed reset threshold | Delivers ±2.5% accuracy over full industrial temperature range without calibration overhead |
Applications
| Battery-Powered Medical Monitor | Automotive Body Control Module |
|---|---|
Use Scenario: Portable ECG device powered by coin-cell battery with variable load-induced voltage sag. IC Role / Device Role / Timing Role: Voltage supervisor asserting RESET during brownout to halt MCU execution until stable 3.3V rail is restored. Use Value: Prevents corrupted sensor data logging and flash write errors during low-battery discharge cycles. |
Use Scenario: 12V automotive subsystem with transient-heavy environment (load dump, cold crank). IC Role / Device Role / Timing Role: Monitors 5V LDO output feeding microcontroller; holds RESET for 4.375ms after VCC recovery. Use Value: Ensures full MCU initialization sequence completes before CAN communication starts, avoiding bus arbitration faults. |
| Industrial PLC I/O Module | Set-Top Box Power Management |
Use Scenario: DIN-rail mounted controller with isolated 24V input and internal 3.3V/5V rails. IC Role / Device Role / Timing Role: Supervises primary 5V rail; open-drain RESET wired-OR'd with watchdog timer output. Use Value: Enables dual-fault detection (supply + software hang) with single reset line to MCU, reducing BOM count. |
Use Scenario: Consumer STB with standby-to-wake transition requiring clean power sequencing. IC Role / Device Role / Timing Role: Monitors 1.8V core rail; asserts RESET during wake-up until voltage stabilizes within 10ms. Use Value: Eliminates boot failures caused by slow-rising DDR memory supply relative to SoC core voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP302LSN46T1G | Fixed 4.63V threshold, 200ms min reset timeout, push-pull output, no capacitor adjustment | Requires longer reset hold time; incompatible with designs needing sub-millisecond timeout or open-drain flexibility | Select when long, fixed reset duration suffices and board space prohibits external capacitor |
| TLV809EC26DBZR | 4.63V threshold, 140ms min timeout, push-pull output, 1.8µA ICC, SOT23-3 package | Smaller footprint but lacks SRT pin adjustability and open-drain output; not suitable for wired-OR or multi-rail logic | Choose for cost-sensitive, space-constrained designs where fixed timeout and single-rail interface are acceptable |
Compared with NCP302LSN46T1G and TLV809EC26DBZR, the MAX6425UK46+T uniquely combines factory-trimmed 4.625V accuracy, capacitor-tunable reset delay, and open-drain output-enabling design flexibility in battery-critical, multi-voltage, and transient-prone systems where timing precision and interface adaptability are essential.
Availability
MAX6425UK46+T is available at Aetrix Electronics and suitable for battery-powered medical monitors, automotive body control modules, and industrial PLC I/O modules requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for MAX6425UK46+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.
The MAX6425UK46+T belongs to the MAX6340/MAX6421–MAX6426 family of ultra-low-power voltage supervisors designed specifically for reliable µP reset generation in space-, power-, and transient-constrained embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX6425UK46+T and how accurate is it over temperature?
The MAX6425UK46+T has a nominal reset threshold of 4.625V, trimmed at the factory with ±1.5% accuracy at +25°C and ±2.5% accuracy across the full -40°C to +125°C operating range. This specification is guaranteed by design and verified per Analog Devices' production test flow-not derived from typical curves or extrapolation.
Can the MAX6425UK46+T operate reliably when VCC drops below 1.6V?
Yes-the MAX6425UK46+T guarantees valid RESET output down to VCC = 1.0V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. Below 1.0V, output drive capability degrades, but the device remains functional and will assert RESET if VCC falls below 4.625V while above 1.0V.
What capacitor value is required to achieve a 4.375ms reset timeout with the MAX6425UK46+T?
A 1500pF capacitor on the SRT pin yields a typical reset timeout of 4.375ms, as explicitly listed in the Electrical Characteristics table under "Reset Timeout Period" with condition CSRT = 1500pF. The relationship is linear: tRP = (2.73 × 10⁶ × CSRT) + 275µs, so 1500pF gives tRP ≈ 4.375ms at +25°C.
Is the MAX6425UK46+T pin-compatible with other devices in the MAX642x family?
Yes-the MAX6425UK46+T shares identical 5-pin SOT23-5 pinout and function mapping with MAX6340, MAX6424, and MAX6426 variants. Pin 1 = SRT, Pin 2 = GND, Pin 3 = N.C., Pin 4 = VCC, Pin 5 = RESET. This allows drop-in replacement among open-drain SOT23-5 members of the family.
Does the MAX6425UK46+T require an external pullup resistor on the RESET pin, and what value is recommended?
Yes-an external pullup resistor is mandatory for the open-drain RESET output. Analog Devices recommends 10kΩ to 100kΩ connected to any logic supply from 0V to 5.5V. A 10kΩ pullup ensures robust logic-high level under worst-case sink current (3.2mA at VCC ≥ 4.5V), while 100kΩ minimizes quiescent current in ultra-low-power systems.
MAX6425UK46+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- 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
MAX6425UK46+T FAQ
1.How can I place an order for MAX6425UK46+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6425UK46+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 MAX6425UK46+T reliable?
The price and inventory of MAX6425UK46+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6425UK46+T is usually 5 days.
3.What payment methods are accepted for MAX6425UK46+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6425UK46+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6425UK46+T?
MAX6425UK46+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6425UK46+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 MAX6425UK46+T?
For technical support, including MAX6425UK46+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6425UK46+T requirements.
6.How does Aetrix verify that MAX6425UK46+T is sourced from the original manufacturer or authorized distributors?
All MAX6425UK46+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 MAX6425UK46+T meets industry standards.
7.What is the process for return or replacement of MAX6425UK46+T?
All MAX6425UK46+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6425UK46+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 MAX6425UK46+T part is unused and in its original packaging.
Return procedure for MAX6425UK46+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6425UK46+T Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
