My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6423US46+T
- Part No.:
- MAX6423US46+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6423US46+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6423US46+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 (3.0–5.75ms at CSRT = 1500pF), 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 MAX6423US46+T datasheet, MAX6423US46+T pinout, MAX6423US46+T application, or MAX6423US46+T equivalent, key selection factors include its 4-pin SOT143 package, 1.6µA typical quiescent current, open-drain RESET compatibility with mixed-voltage logic, immunity to sub-50µs VCC transients, and factory-laser-trimmed threshold accuracy.
Technical Context
The MAX6423US46+T implements a precision voltage-detection circuit using laser-trimmed resistors to set its 4.625V reset threshold with ±2.5% tolerance over –40°C to +125°C. Its internal 240nA current source charges an external capacitor on the SRT pin to generate a programmable reset timeout delay.
Reset assertion occurs when VCC falls below the threshold; deassertion requires both VCC rise above threshold and full ramp of the SRT capacitor to 0.65V. The open-drain RESET output supports wired-OR configuration and pullup to any voltage ≤5.5V, enabling flexible interface with diverse µP logic families.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.625V ±2.5% (factory laser-trimmed; ensures accurate brownout detection at nominal system rail) |
| Quiescent Current | 1.6µA typ at VCC ≤ 2.0V (enables multi-year battery life in portable equipment) |
| Reset Timeout Range | 0.275ms to >6ms (set by external capacitor; CSRT = 1500pF yields 3.0–5.75ms) |
| Operating Voltage | 1.0V to 5.5V (guaranteed RESET validity down to VCC = 1V for low-voltage brownout coverage) |
| Output Type | Active-low open-drain (supports wired-OR reset, level-shifting, and multi-supply interface) |
| Temperature Range | –40°C to +125°C (qualified for automotive and industrial environments) |
| VCC Transient Immunity | No reset for ≤50µs negative glitches ≥100mV below threshold (reduces false resets in noisy systems) |
Pinout & Package
MAX6423US46+T is housed in a 4-pin SOT143 package (package code U4+1), measuring 2.1mm × 2.3mm × 0.95mm, with gull-wing leads and RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCC | Supply voltage input and reset threshold monitor | Primary power rail connection; internal comparator references this node to detect undervoltage |
| 2 - GND | Ground reference | Analog and digital ground return; must be low-impedance for stable threshold and timing |
| 3 - RESET | Active-low open-drain reset output | Sinks current when asserted; requires external pullup to define high-level voltage (e.g., 3.3V or 5V) |
| 4 - SRT | Set-reset-time input | Connects to external timing capacitor; 240nA constant current charges CSRT to control timeout duration |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise tailoring of reset hold time (0.275ms–6ms+) to match µP reset requirements without firmware changes |
| Open-drain RESET output | Permits direct interface with µPs operating at different supply voltages (0–5.5V pullup) and enables wired-OR reset arbitration |
| Laser-trimmed reset threshold | Delivers ±2.5% accuracy over full temperature range, eliminating need for external calibration or trimming components |
| Ultra-low quiescent current | 1.6µA typical at 2.0V enables use in always-on battery-backed systems with minimal drain impact |
| Immunity to short VCC transients | Rejects glitches ≤50µs wide and ≥100mV deep, preventing spurious resets in electrically noisy automotive or industrial settings |
Applications
| Battery-Powered Embedded Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Microcontroller in handheld medical device powered by single Li-ion cell (2.8–4.2V range) requiring fail-safe reset during discharge-induced brownout. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low RESET to halt µP execution until VCC recovers above 4.625V and sustains valid reset timeout. Use Value: Prevents corrupted memory writes and undefined state during low-VCC operation; 1.6µA ICC extends battery runtime. |
Use Scenario: Power management unit in door module monitoring 12V battery-derived 5V rail subject to load-dump and cranking transients. IC Role / Device Role / Timing Role: Brownout detector holding ECU in reset during engine start-up voltage sag, with immunity to <50µs noise spikes. Use Value: Ensures deterministic boot sequence after cranking; open-drain output interfaces directly with 3.3V µP I/O despite 5V system rail. |
| Industrial Sensor Node | Medical Infusion Pump Controller |
Use Scenario: Wireless sensor node powered by energy harvester with highly variable VCC (1.8–4.5V); requires robust reset under slow-ramp power-up. IC Role / Device Role / Timing Role: Supervisor validating VCC stability before releasing µP from reset, using SRT capacitor to extend timeout for slow-rising supplies. Use Value: Eliminates premature boot attempts; guaranteed operation down to VCC = 1V ensures reset assertion even during deep brownout. |
Use Scenario: Safety-critical infusion pump controller where unintended µP restart could cause overdose; demands fail-safe reset with verified timing margin. IC Role / Device Role / Timing Role: Primary reset generator with factory-trimmed 4.625V threshold aligned to 5V LDO output, providing deterministic 4.375ms (typ) reset hold. Use Value: Laser-trimmed accuracy and temperature-stable timeout meet IEC 62304 Class C software safety requirements for hardware-initiated reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6425UK46+T | 5-pin SOT23-5 package; identical 4.625V threshold, open-drain output, and electrical specs | Requires PCB layout change due to 5-pin vs. 4-pin footprint; same timing and interface behavior | Select when SOT23-5 is preferred for assembly or thermal performance; no functional redesign needed |
| NCP302HS46T1G | Fixed 4.63V threshold, push-pull active-low RESET, 1.5µA ICC, but no capacitor-adjustable timeout (fixed 200ms) | Lacks programmable reset delay; unsuitable where µP requires sub-millisecond or custom timeout | Choose only if fixed long timeout suffices and push-pull drive is required; not drop-in compatible |
Compared with MAX6425UK46+T, the MAX6423US46+T offers identical supervision functionality in a smaller 4-pin SOT143 footprint, reducing board area; versus NCP302HS46T1G, it provides critical design flexibility via adjustable timeout and open-drain output for multi-rail systems.
Availability
MAX6423US46+T is available at Aetrix Electronics and suitable for battery-powered computers, automotive body electronics, and medical equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6423US46+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 MAX6423US46+T belongs to the MAX6340/MAX6421–MAX6426 family of ultra-low-power microprocessor supervisors, designed specifically for reliable power-on reset, brownout protection, and reset timeout control in space-constrained, battery-sensitive applications.
FAQ
What is the exact reset threshold voltage of the MAX6423US46+T?
The MAX6423US46+T features a factory-laser-trimmed reset threshold of 4.625V with ±1.5% accuracy at +25°C and ±2.5% over –40°C to +125°C. This value is confirmed in Table 1 of the datasheet and corresponds to the "46" suffix in the part number. The MAX6423US46+T uses precision internal resistors to maintain this threshold without external components.
Does the MAX6423US46+T require an external capacitor to function?
The MAX6423US46+T operates as a basic voltage detector without an external capacitor-floating the SRT pin enables immediate reset assertion/deassertion with minimal delay. However, to achieve the specified reset timeout period (e.g., 4.375ms typical), a capacitor must be connected between SRT and GND. The MAX6423US46+T's internal 240nA current source charges this capacitor to generate the delay.
Can the MAX6423US46+T drive a 3.3V microcontroller reset input from a 5V system rail?
Yes-the MAX6423US46+T's open-drain RESET output allows direct interfacing with 3.3V µPs even when powered from a 5V rail. Connect the external pullup resistor to the 3.3V supply (not VCC). The MAX6423US46+T guarantees VOL ≤ 0.3V at ISINK = 500µA, ensuring solid logic-low assertion, and VOH follows the pullup voltage, enabling clean 3.3V-compatible reset signaling.
What package type does the MAX6423US46+T use, and is it RoHS-compliant?
The MAX6423US46+T uses a 4-pin SOT143 package (package code U4+1), with dimensions 2.1mm × 2.3mm × 0.95mm and gull-wing leads. The "+T" suffix confirms tape-and-reel packaging and RoHS-compliant lead-free finish. This package is distinct from the 5-pin SOT23 variants (e.g., MAX6425UK46+T) and requires dedicated land pattern 90-0183.
How does the MAX6423US46+T handle short voltage transients on the VCC line?
The MAX6423US46+T is specifically designed to reject short negative-going VCC transients: it will not assert reset for glitches ≤50µs wide that dip ≥100mV below the 4.625V threshold. This behavior is characterized in the "Maximum Transient Duration vs. Reset Threshold Overdrive" graph. The MAX6423US46+T achieves this via internal filtering and hysteresis, making it suitable for automotive and industrial environments with high EMI.
MAX6423US46+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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-143-4
MAX6423US46+T FAQ
1.How can I place an order for MAX6423US46+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6423US46+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 MAX6423US46+T reliable?
The price and inventory of MAX6423US46+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6423US46+T is usually 5 days.
3.What payment methods are accepted for MAX6423US46+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6423US46+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6423US46+T?
MAX6423US46+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6423US46+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 MAX6423US46+T?
For technical support, including MAX6423US46+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6423US46+T requirements.
6.How does Aetrix verify that MAX6423US46+T is sourced from the original manufacturer or authorized distributors?
All MAX6423US46+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 MAX6423US46+T meets industry standards.
7.What is the process for return or replacement of MAX6423US46+T?
All MAX6423US46+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6423US46+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 MAX6423US46+T part is unused and in its original packaging.
Return procedure for MAX6423US46+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6423US46+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…
