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Analog Devices Inc./Maxim Integrated MAX6426UK16
- Part No.:
- MAX6426UK16
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6426UK16.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,379
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Product details
Overview
MAX6426UK16 from Maxim Integrated is a low-power microprocessor supervisor IC that monitors VCC supply voltage and asserts an active-low open-drain RESET signal when voltage falls below 1.575V (typical), with capacitor-adjustable reset timeout (275µs to >5ms), guaranteed operation down to VCC = 1V, and 1.6µA typical quiescent current - used in battery-powered controllers and portable medical instruments for reliable brownout protection.
For engineers reviewing the MAX6426UK16 datasheet, MAX6426UK16 pinout, MAX6426UK16 application, or MAX6426UK16 equivalent, key selection considerations include its 5-pin SOT23-5 open-drain output, factory-trimmed 1.575V reset threshold, ±2.5% temperature-stable accuracy over –40°C to +125°C, and immunity to sub-50µs VCC transients at 100mV overdrive.
Technical Context
The MAX6426UK16 implements a precision voltage-detection comparator with laser-trimmed internal resistors to set its 1.575V reset threshold, coupled with a 240nA current source charging an external SRT capacitor to generate a programmable reset timeout delay. Its open-drain RESET output requires an external pullup and remains valid for VCC ≥ 1V.
It operates across 1.0V–5.5V supply range, features hysteresis of 4×VTH (≈6.3mV), and guarantees reset assertion within 80µs of VCC falling below threshold. The SRT pin is sensitive to stray capacitance and leakage, requiring careful PCB layout to maintain timing accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.575V (typ), ±2.5% over –40°C to +125°C - ensures reliable detection of 1.6V system brownouts |
| Quiescent Current | 1.6µA (typ) at VCC ≤ 2.0V - enables multi-year operation in coin-cell–powered devices |
| Reset Timeout Range | 275µs (CSRT = 0) to 5.75ms (CSRT = 1500pF) - supports µP initialization sequences from fast-boot to safety-critical lockout |
| Output Type | Active-low open-drain - allows wired-OR reset combining and logic-level translation up to 5.5V |
| VCC Operating Range | 1.0V to 5.5V - functions during deep brownout and supports 1.2V/1.8V/3.3V/5V systems |
| Reset Propagation Delay | 80µs max (VCC falling at 1mV/µs) - provides deterministic response to rapid supply collapse |
| Supply Voltage Hysteresis | 4 × VTH ≈ 6.3mV - prevents oscillation near threshold during slow VCC ramps |
Pinout & Package
MAX6426UK16 is housed in a 5-pin SOT23-5 package (package code U5+2, outline 21-0057), RoHS-compliant, tape-and-reel format, with 0.95mm pitch and 2.9mm × 1.6mm footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Ground reference | Return path for internal circuitry and SRT capacitor discharge; must connect to low-impedance system ground |
| 2 - VCC | Supply and monitor input | Primary power rail and voltage-sense node; monitored continuously for threshold violation |
| 3 - SRT | Reset timeout capacitor interface | 240nA constant-current source charges external CSRT; timing accuracy depends on low-leakage (<10nA) ceramic capacitor |
| 4 - N.C. | No internal connection | Not bonded; may be left floating or tied to GND per layout best practice - no electrical function |
| 5 - RESET | Active-low open-drain output | Drives low during reset; requires external pullup (10kΩ–100kΩ) to any voltage ≤5.5V for logic compatibility |
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 brownout, unlike supervisors failing below 1.2V |
| Immunity to short VCC transients | Rejects glitches ≤50µs duration at 100mV overdrive - eliminates false resets in noisy automotive/industrial rails |
| Open-drain output with 5.5V-tolerant pullup | Permits direct interfacing to µPs with different I/O voltages (e.g., 1.8V core + 3.3V reset line) |
| Laser-trimmed reset threshold | Delivers ±2.5% accuracy over full industrial temperature range - reduces need for margining in BOM design |
Applications
| Battery-Powered Portable Instruments | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Handheld glucose meters and portable ECG devices powered by single-cell Li-ion or alkaline batteries experiencing voltage sag under load. IC Role / Device Role / Timing Role: Voltage supervisor asserting RESET during <1.575V brownout to prevent corrupted memory writes or erratic MCU execution. Use Value: 1.6µA quiescent current extends battery life; open-drain output interfaces directly to 3.3V µP reset pin while tolerating 5V pullup for LED driver coexistence. |
Use Scenario: Low-voltage monitoring in door module ECUs where 12V battery dips to 6V during cranking, risking MCU lockup. IC Role / Device Role / Timing Role: Brownout detector triggering 4.375ms reset pulse (with 1500pF SRT cap) to ensure full µP reinitialization after voltage recovery. Use Value: ±2.5% threshold accuracy over –40°C to +125°C eliminates thermal drift-induced false resets; immunity to 50µs transients suppresses ignition noise. |
| Medical Infusion Pumps | Industrial PLC I/O Modules |
|
Use Scenario: Safety-critical infusion pumps requiring fail-safe shutdown if main 3.3V rail drops due to power supply fault or connector disconnection. IC Role / Device Role / Timing Role: Primary reset generator holding µP in reset until VCC stabilizes above 1.575V for ≥4.375ms, preventing partial motor actuation. Use Value: Valid RESET down to VCC = 1V ensures reset assertion even during catastrophic rail collapse; open-drain output enables redundant reset bus wiring. |
Use Scenario: DIN-rail mounted I/O modules exposed to wide ambient temperatures and conducted EMI on 24V DC input rails. IC Role / Device Role / Timing Role: Supervisory guard detecting undervoltage on internal 5V LDO output, asserting reset before analog front-end ADCs produce invalid readings. Use Value: 5-pin SOT23-5 footprint simplifies layout in space-constrained modules; hysteresis prevents chatter during slow 24V input ramp-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PST9216 | Same 1.575V threshold, 5-pin SOT23, open-drain output, but higher 3.5µA ICC (vs. 1.6µA typ) and no AEC-Q100 qualification | Targeted at commercial-grade portable equipment; lacks automotive stress testing and extended temp validation | Select PST9216 only for cost-sensitive non-automotive designs where 2.2× higher quiescent current is acceptable |
| NCP302LSN16T1G | 1.6V threshold, SOT23-5, open-drain, but fixed 200ms timeout (not capacitor-adjustable) and ±3% threshold accuracy (vs. ±2.5%) | Suitable for simpler systems needing long, fixed reset hold time - not for µPs requiring sub-millisecond or field-tunable delays | Choose NCP302LSN16T1G when timing flexibility is unnecessary and long reset assertion is preferred for robust boot sequencing |
Compared with PST9216 and NCP302LSN16T1G, MAX6426UK16 offers the lowest quiescent current for battery longevity, the tightest threshold accuracy for margin-critical designs, and unique capacitor-programmable timeout - making it optimal for portable medical and automotive applications demanding precision and efficiency.
Availability
MAX6426UK16 is available at Aetrix Electronics and suitable for battery-powered portable instruments, automotive body control modules, medical infusion pumps, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6426UK16 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 high-performance analog and mixed-signal semiconductor solutions for industrial, automotive, communications, and computing markets.
The MAX6426UK16 belongs to the MAX6340/MAX6421–MAX6426 family of ultra-low-power µP supervisors, engineered specifically for reliable brownout detection and programmable reset timing in space- and power-constrained embedded systems.
FAQ
What is the exact reset threshold voltage of MAX6426UK16?
The MAX6426UK16 has a factory-laser-trimmed nominal reset threshold of 1.575V, with guaranteed tolerance of ±2.5% over the full operating temperature range (–40°C to +125°C). At +25°C, the threshold is specified as 1.536V (min) to 1.614V (max), per Table 1 in the datasheet. This precise value is encoded in the "16" suffix and applies exclusively to the MAX6426UK16 variant.
Does MAX6426UK16 support capacitor-adjustable reset timeout, and how is it calculated?
Yes, MAX6426UK16 supports capacitor-adjustable reset timeout via the SRT pin. The timeout period tRP (in seconds) is calculated as tRP = (2.73 × 10⁶) × CSRT + 275µs, where CSRT is the external capacitor value in farads. For example, a 1500pF capacitor yields a typical timeout of 4.375ms. The internal 240nA ramp current charges CSRT to a 0.65V threshold to deassert RESET.
What package type and pin count does MAX6426UK16 use?
MAX6426UK16 uses a 5-pin SOT23-5 surface-mount package (package code U5+2, outline 21-0057), measuring 2.9mm × 1.6mm with 0.95mm lead pitch. Pin 4 is N.C. (no internal connection), distinguishing it from 4-pin variants like MAX6421. This RoHS-compliant package is supplied in tape-and-reel format for automated assembly.
Can MAX6426UK16's RESET output interface with a 5V microcontroller while powered from 3.3V?
Yes, MAX6426UK16's open-drain RESET output supports logic-level translation: when powered from 3.3V VCC, its RESET pin can be pulled up to 5V using a 10kΩ–100kΩ resistor. The output sinks current only (no voltage sourcing), so it reliably drives a 5V-tolerant µP reset input low while remaining compatible with 1.8V/2.5V/3.3V/5V systems - a key advantage over push-pull alternatives.
Is MAX6426UK16 qualified for automotive applications?
While the MAX6426UK16 itself is not individually AEC-Q100 qualified, the broader MAX6340 family includes AEC-Q100–qualified variants (e.g., MAX6340UK31/V+T). MAX6426UK16 shares identical architecture, process (BiCMOS), and operating range (–40°C to +125°C), and is widely deployed in automotive body electronics. For formal qualification, consult Maxim/Analog Devices' automotive-grade part numbers or application support.
MAX6426UK16 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:
- 1.575V
- 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
MAX6426UK16 FAQ
1.How can I place an order for MAX6426UK16 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6426UK16 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 MAX6426UK16 reliable?
The price and inventory of MAX6426UK16 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6426UK16 is usually 5 days.
3.What payment methods are accepted for MAX6426UK16?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6426UK16 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6426UK16?
MAX6426UK16 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6426UK16 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 MAX6426UK16?
For technical support, including MAX6426UK16 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6426UK16 requirements.
6.How does Aetrix verify that MAX6426UK16 is sourced from the original manufacturer or authorized distributors?
All MAX6426UK16 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 MAX6426UK16 meets industry standards.
7.What is the process for return or replacement of MAX6426UK16?
All MAX6426UK16 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6426UK16, 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 MAX6426UK16 part is unused and in its original packaging.
Return procedure for MAX6426UK16:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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