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Analog Devices Inc./Maxim Integrated MAX6338IUB+
- Part No.:
- MAX6338IUB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX6338IUB+.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,669
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Product details
Overview
MAX6338IUB+ from Maxim Integrated is a quad voltage monitor IC designed for multivoltage system supervision, monitoring fixed +5.0V, +3.3V, +2.5V, and +1.8V supplies with 10% tolerance thresholds, consuming only 25µA typical supply current, operating from +2.5V to +5.5V VCC, and delivering four independent open-drain active-low outputs in a 10-pin µMAX package - used in desktop computers and data storage equipment for reliable power-good signaling.
For engineers reviewing the MAX6338IUB+ datasheet, MAX6338IUB+ pinout, MAX6338IUB+ application, or MAX6338IUB+ equivalent, this page delivers verified threshold voltages (+5.0V/−10%, +3.3V/−10%, +2.5V/−10%, +1.8V/−10%), guaranteed −40°C to +85°C operation, internal bandgap reference accuracy, wire-ORable outputs, and undervoltage lockout behavior - all critical for embedded power sequencing and fault detection design.
Technical Context
The MAX6338IUB+ integrates four independent comparators, each with factory-trimmed resistive dividers tied to a 1.23V internal bandgap reference, enabling precise trip points without external components. All inputs are high-impedance, and each output features a weak 10µA internal pull-up to VCC, supporting open-drain wire-OR configuration.
It includes an undervoltage lockout (UVLO) circuit that forces all outputs low when VCC drops below +2.5V, ensuring valid monitoring only within its specified supply range. Threshold hysteresis is built-in at 0.3%, eliminating need for external feedback networks - unlike standard comparators requiring external resistors for noise immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.5V to +5.5V - supports direct connection to monitored rails like +3.3V or +5V while powering the IC itself. |
| Supply Current (typ) | 25µA at +5V - enables always-on supervision in battery-backed or low-power systems without significant load. |
| Threshold Accuracy | ±1.5% over −40°C to +85°C - ensured by internal bandgap reference and factory trimming, no calibration required. |
| Input Thresholds | +5.0V/−10%, +3.3V/−10%, +2.5V/−10%, +1.8V/−10% - matches common LDO and regulator tolerances for clean power-good assertion. |
| Output Type | Four open-drain, active-low outputs with 10µA internal pull-ups - allows flexible logic interfacing and wire-ORing into single system reset line. |
| Propagation Delay | 20µs max - provides deterministic response time for fast-supply-fail detection before downstream logic corruption. |
| Operating Temperature | −40°C to +85°C - qualified for industrial and computing environments without derating. |
Pinout & Package
The MAX6338IUB+ is housed in a 10-pin µMAX® package (3.0mm × 3.0mm, 0.6mm height), lead-free and RoHS-compliant, with exposed pad for thermal enhancement and standard surface-mount footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN1) | Input 1 | Monitors +5.0V nominal supply; trips low when voltage falls below 4.50V (−10% threshold). |
| 2 (IN2) | Input 2 | Monitors +3.3V nominal supply; trips low when voltage falls below 2.97V (−10% threshold). |
| 3 (IN3) | Input 3 | Monitors +2.5V nominal supply; trips low when voltage falls below 2.25V (−10% threshold). |
| 4 (IN4) | Input 4 | Monitors +1.8V nominal supply; trips low when voltage falls below 1.62V (−10% threshold). |
| 5 (GND) | Ground Reference | Common return path for all internal comparators and UVLO circuitry; must be low-impedance. |
| 6 (OUT4) | Output 4 | Active-low open-drain output corresponding to IN4; sinks current when +1.8V rail fails. |
| 7 (OUT3) | Output 3 | Active-low open-drain output corresponding to IN3; sinks current when +2.5V rail fails. |
| 8 (OUT2) | Output 2 | Active-low open-drain output corresponding to IN2; sinks current when +3.3V rail fails. |
| 9 (OUT1) | Output 1 | Active-low open-drain output corresponding to IN1; sinks current when +5.0V rail fails. |
| 10 (VCC) | Power Supply | +2.5V to +5.5V input; powers all circuitry and sources internal pull-ups; UVLO disables outputs below +2.5V. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed quad thresholds | Fixed +5.0V/−10%, +3.3V/−10%, +2.5V/−10%, +1.8V/−10% - eliminates resistor selection, layout, and calibration effort. |
| Internal 1.23V bandgap reference | Stable reference across temperature and supply - ensures ±1.5% threshold accuracy without external components. |
| Built-in 0.3% hysteresis | Prevents output oscillation near trip points - removes need for external positive feedback resistors. |
| Undervoltage lockout (UVLO) | Forces all outputs low if VCC < +2.5V - guarantees valid monitoring state only when IC is fully powered. |
| Wire-ORable open-drain outputs | Enables aggregation of all four outputs into one system-level "power-fail" signal using external pull-up. |
Applications
| Desktop Computer Power Sequencing | Industrial PLC Power Supervision |
|---|---|
|
Use Scenario: Monitoring ATX main +5V, +3.3V, +2.5V, and +1.8V rails during boot and runtime. IC Role / Device Role / Timing Role: Quad voltage supervisor asserting individual or combined reset signals upon any rail dropout. Use Value: Prevents CPU or chipset initialization under marginal voltage conditions, improving system reliability without discrete comparator circuits. |
Use Scenario: Ensuring stable operation of microcontroller, I/O drivers, and analog front-end in programmable logic controllers. IC Role / Device Role / Timing Role: Independent rail monitoring with fast 20µs response to detect brownouts before control loop instability. Use Value: Enables deterministic fail-safe shutdown via watchdog or FPGA interface, meeting IEC 61000-4-29 immunity requirements. |
| Data Storage Controller Board | Networking Switch ASIC Power Domain |
|
Use Scenario: Validating multiple voltage domains (e.g., +5V SATA, +3.3V PCIe, +2.5V memory, +1.8V SerDes) on enterprise SSD controller boards. IC Role / Device Role / Timing Role: Simultaneous rail validation with active-low outputs tied to FPGA reset inputs for domain-specific recovery. Use Value: Reduces BOM count vs. four discrete supervisors and avoids timing skew between rail failure detection paths. |
Use Scenario: Supervising core, I/O, SerDes, and auxiliary rails in multi-gigabit Ethernet switch ASICs. IC Role / Device Role / Timing Role: Providing synchronized power-good status to ASIC's internal power management unit (PMU) via wired-OR output. Use Value: Eliminates need for external logic gates to combine four rail statuses, saving PCB area and routing complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3307-33DGNR | Triple monitor (+3.3V, +5V, adjustable); no +1.8V fixed threshold; higher 45µA ICC; SOT-23-8 package. | Lacks fourth dedicated +1.8V channel - requires external divider for 1.8V monitoring, increasing component count. | Select when only three rails need supervision and board space is constrained; not drop-in for MAX6338IUB+'s 4-rail use case. |
| ADM1085AKSZ-REEL7 | Dual +3.3V/+5V monitor with manual reset; no +2.5V/+1.8V support; 20µA ICC; SC70-6 package. | Supports only two fixed rails; requires external circuitry for additional rail monitoring or hysteresis tuning. | Choose for cost-sensitive dual-rail systems where expansion to four rails is unnecessary; incompatible pinout and function set. |
Compared with TPS3307-33DGNR and ADM1085AKSZ-REEL7, the MAX6338IUB+ uniquely delivers four factory-matched, 10%-tolerance thresholds in one µMAX package - simplifying design for multivoltage computing and storage platforms where +1.8V and +2.5V rail integrity is mandatory.
Availability
MAX6338IUB+ is available at Aetrix Electronics and suitable for desktop computers, industrial PLCs, and data storage equipment requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.
Supply support for MAX6338IUB+ 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 precision analog, mixed-signal, and power management ICs for industrial, computing, and communications markets.
The MAX6338 family was designed specifically for multivoltage system supervision in space-constrained computing and telecom platforms - delivering integrated, low-power, factory-trimmed voltage monitoring without external passive components.
FAQ
What are the exact factory-programmed threshold voltages for MAX6338IUB+?
The MAX6338IUB+ monitors +5.0V (trip at 4.50V), +3.3V (trip at 2.97V), +2.5V (trip at 2.25V), and +1.8V (trip at 1.62V), all with −10% tolerance. These values are laser-trimmed at wafer test and guaranteed over −40°C to +85°C per the datasheet's Electrical Characteristics table.
Does MAX6338IUB+ require external resistors or capacitors to operate?
No. The MAX6338IUB+ requires zero external components for basic operation: all thresholds are factory-set, hysteresis is internal (0.3%), and the 10µA internal pull-ups eliminate need for external pull-ups unless higher sink current or different logic voltage is required. A 0.1µF bypass capacitor on VCC is recommended but not mandatory.
Can the outputs of MAX6338IUB+ be wire-ORed together?
Yes. All four outputs of MAX6338IUB+ are open-drain and active-low, with weak 10µA internal pull-ups to VCC. They can be directly connected to a single net with an external pull-up (e.g., to +3.3V or +5V) to generate a composite "any-rail-fail" signal - commonly used for system reset assertion.
What happens to MAX6338IUB+ outputs when VCC drops below 2.5V?
When VCC falls below +2.5V, the internal undervoltage lockout (UVLO) circuit forces all four outputs of MAX6338IUB+ low, regardless of input voltage states. This ensures predictable behavior during power-down and prevents spurious resets caused by marginal VCC.
Is MAX6338IUB+ compatible with lead-free PCB assembly processes?
Yes. MAX6338IUB+ is supplied in lead-free packaging (denoted by the "+" suffix) and rated for reflow soldering per JEDEC J-STD-020. Its µMAX package supports standard Pb-free reflow profiles with peak temperatures up to +260°C, and it meets RoHS Directive 2011/65/EU requirements.
MAX6338IUB+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 4
- Voltage - Threshold:
- 1.58V, 2.19V, 2.93V, 4.38V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- <1ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-uMAX/uSOP
MAX6338IUB+ FAQ
1.How can I place an order for MAX6338IUB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6338IUB+ 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 MAX6338IUB+ reliable?
The price and inventory of MAX6338IUB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6338IUB+ is usually 5 days.
3.What payment methods are accepted for MAX6338IUB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6338IUB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6338IUB+?
MAX6338IUB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6338IUB+ 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 MAX6338IUB+?
For technical support, including MAX6338IUB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6338IUB+ requirements.
6.How does Aetrix verify that MAX6338IUB+ is sourced from the original manufacturer or authorized distributors?
All MAX6338IUB+ 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 MAX6338IUB+ meets industry standards.
7.What is the process for return or replacement of MAX6338IUB+?
All MAX6338IUB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6338IUB+, 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 MAX6338IUB+ part is unused and in its original packaging.
Return procedure for MAX6338IUB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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