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Analog Devices Inc./Maxim Integrated MAX6408BS31-T
- Part No.:
- MAX6408BS31-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 4-WFBGA, CSPBGA
- Datasheet:
-
MAX6408BS31-T.pdf
- Description:
- IC SUPERVISOR VOLT DETECTOR
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
MAX6408BS31-T from Maxim Integrated is an ultra-low-power, open-drain, active-low voltage detector with a factory-trimmed threshold of 3.08V ±2.5% (–40°C to +85°C), 500nA supply current, and operation down to VCC = 1.0V. It monitors system supply rails in portable battery-powered devices and asserts reset when voltage drops below threshold.
For engineers reviewing the MAX6408BS31-T datasheet, MAX6408BS31-T pinout, MAX6408BS31-T application, or MAX6408BS31-T equivalent, key selection factors include its open-drain output configuration, guaranteed logic state at 1V VCC, immunity to sub-µs VCC transients, and compatibility with mixed-voltage logic interfaces via external pullup.
Technical Context
The MAX6408BS31-T uses a precision bandgap reference comparator architecture with internal hysteresis (6.3mV typical) to reject noise and prevent chatter during threshold crossing. Its manual reset (MR) input features a 50kΩ internal pullup and supports TTL/CMOS logic levels or open-drain drivers.
Designed for single-supply monitoring, it operates across 1.2V–5.5V VCC (–40°C to +85°C), delivers propagation delay under 42µs (VCC falling), and maintains output validity even as VCC decays to 1.0V - enabling reliable brownout detection in deep-sleep states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±2.5% over –40°C to +85°C - ensures accurate brownout detection across industrial temperature range |
| Supply Current | 500nA typical at +25°C - enables multi-year battery life in always-on monitoring applications |
| Output Type | Active-low open-drain - allows wired-OR logic, level translation up to 5.5V, and flexible pullup placement |
| VCC Operating Range | 1.2V to 5.5V - supports low-voltage microcontrollers and wide-input DC/DC converters |
| MR Input Logic | Active-low with 50kΩ internal pullup - eliminates external resistor; compatible with pushbutton or logic-driven reset |
| Propagation Delay | ≤42µs (VCC falling) - provides fast response to supply collapse without excessive sensitivity to ripple |
| Threshold Hysteresis | 6.3mV typical - prevents oscillation during slow or noisy VCC recovery near trip point |
Pinout & Package
Package: UCSP-4 (4-bump, 2×2 mm chip-scale package), bottom-mounted solder bumps, tape-and-reel delivery.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (A1) | Ground reference | Primary return path for internal comparator and MR input; must be low-impedance connection to system ground plane |
| VCC (A2) | Supply and sense input | Monitored voltage rail; powers device and serves as analog input to threshold comparator |
| MR (B2) | Manual reset input | Active-low control: pulling below 0.2×VCC asserts output; internal 50kΩ pullup enables NC or VCC tie-off |
| OUT (B1) | Open-drain output | Sinks current when asserted (low); requires external pullup to define logic-high level and drive load |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low 500nA supply current | Enables continuous monitoring in coin-cell–powered devices for >10 years without battery replacement |
| Factory-trimmed 3.08V threshold | Eliminates calibration overhead and external resistive dividers; reduces BOM count and layout area |
| Guaranteed output validity to VCC = 1.0V | Ensures deterministic reset assertion during deep brownout or ultra-low-power sleep modes |
| Immunity to short VCC transients | Rejects glitches ≤100ns (at 100mV overdrive), preventing false resets in electrically noisy environments |
| Open-drain output with 0.1µA leakage | Supports multi-drop bus configurations and level-shifting to higher-voltage logic domains (up to 5.5V) |
Applications
| Battery-Powered Wearables | Low-Voltage Microcontroller Systems |
|---|---|
Use Scenario: Continuous voltage monitoring in fitness trackers powered by 3.0V Li-ion cells with aggressive power-gating. IC Role / Device Role / Timing Role: Brownout detector asserting system reset before MCU enters undefined state during discharge below 3.0V. Use Value: Prevents data corruption and flash write errors by guaranteeing clean reset initiation at precisely 3.08V with <42µs latency. | Use Scenario: Reset supervision for ARM Cortex-M0+ MCUs operating from buck-boost regulators with 1.8–3.6V output range. IC Role / Device Role / Timing Role: Primary VCC supervisor ensuring valid reset until VCC ≥ 3.08V, with output valid down to 1.0V for deep-sleep wake-up integrity. Use Value: Enables safe entry/exit from STOP mode by maintaining reset assertion through full VCC ramp-up, eliminating boot-time race conditions. |
| Portable Medical Sensors | Energy-Harvesting Edge Nodes |
Use Scenario: ECG patch using supercapacitor backup and intermittent BLE transmission; requires reliable reset on capacitor voltage sag. IC Role / Device Role / Timing Role: Low-quiescent monitor interfaced to 3.3V LDO output, driving reset line of ultra-low-power ADC and radio SoC. Use Value: 500nA current draw extends supercap runtime; open-drain output allows shared reset bus with other peripherals. | Use Scenario: Solar-harvested IoT node with variable input (2.2–4.5V); needs deterministic startup only when energy buffer exceeds operational minimum. IC Role / Device Role / Timing Role: Power-good enabler that releases reset after VCC crosses 3.08V and remains stable for >88µs (startup time). Use Value: Prevents premature MCU activation during unstable charge cycles; hysteresis avoids oscillation during slow solar ramp-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage detector applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6406BS31-T | Push-pull active-low output; no external pullup required; same 3.08V threshold and 500nA ICC | Preferred where single-supply logic interface and minimal external components are critical | Select when board space is constrained and no level translation or wired-OR is needed |
| TPS3808G30DBVR | 3.0V threshold, 1.6µA ICC (typ), SOT-23-5 package, no manual reset input | Higher supply current limits battery lifetime; lacks MR pin for test/reset flexibility | Choose only if UCSP footprint is incompatible and 1.6µA quiescent is acceptable |
Compared with MAX6406BS31-T, the MAX6408BS31-T trades push-pull simplicity for open-drain flexibility and interoperability; versus TPS3808G30DBVR, it delivers 3.2× lower supply current and adds manual reset - critical for field service and debug in portable designs.
Availability
MAX6408BS31-T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered wearables, low-voltage microcontroller systems, and energy-harvesting edge nodes requiring stable component supply and long-term lifecycle support.
Supply support for MAX6408BS31-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) designs precision analog and mixed-signal ICs for power, sensing, and interface applications in demanding environments.
The MAX6406–MAX6411 family was engineered specifically for ultra-low-power voltage supervision in space-constrained, battery-critical portable electronics - prioritizing nanoscale quiescent current, guaranteed sub-1V operation, and minimal external component count.
FAQ
What is the exact factory-trimmed threshold voltage of the MAX6408BS31-T?
The MAX6408BS31-T has a nominal reset threshold of 3.08V, with tolerance of ±2.5% over the full operating temperature range (–40°C to +85°C). At +25°C, the threshold is specified as 3.034V (min) to 3.126V (max), per Table 1 in the datasheet. This value is laser-trimmed at wafer test and requires no external calibration.
Can the MAX6408BS31-T operate reliably below 1.8V VCC?
Yes - the MAX6408BS31-T guarantees correct output logic state down to VCC = 1.0V, and its absolute minimum operating VCC is 1.2V (–40°C to +85°C). This makes it suitable for supervising ultra-low-voltage domains such as deep-sleep MCU cores or energy-harvesting storage capacitors.
Does the MAX6408BS31-T require an external pullup resistor on the OUT pin?
Yes - because the MAX6408BS31-T features an open-drain output, an external pullup resistor is mandatory to establish a defined logic-high level. The pullup may connect to any voltage ≤5.5V (e.g., I/O rail or higher-voltage domain), enabling level translation. Resistor value must balance VOL spec (<0.4V @ 100µA) and rise time requirements.
How does the manual reset (MR) input behave when left unconnected?
When left unconnected, the MR input of the MAX6408BS31-T is pulled high internally by a 50kΩ resistor to VCC, rendering the pin inactive and allowing normal voltage-monitoring operation. No external pullup is needed. To assert reset, MR must be driven below 0.2×VCC (e.g., via momentary switch to GND).
Is the MAX6408BS31-T RoHS-compliant and lead-free?
The MAX6408BS31-T suffix indicates tape-and-reel packaging but does not denote RoHS compliance. Per Maxim's ordering information, this variant uses pkgcode/variation B4-3* and is marked "RoHS/Lead-Free: No". For lead-free versions, specify MAX6408BS31+T (RoHS-compliant, pkgcode B4+3*).
MAX6408BS31-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 4-WFBGA, CSPBGA
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 20µs Typical Propagation Delay
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-UCSP (1.05x1.05)
MAX6408BS31-T FAQ
1.How can I place an order for MAX6408BS31-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6408BS31-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 MAX6408BS31-T reliable?
The price and inventory of MAX6408BS31-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6408BS31-T is usually 5 days.
3.What payment methods are accepted for MAX6408BS31-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6408BS31-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6408BS31-T?
MAX6408BS31-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6408BS31-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 MAX6408BS31-T?
For technical support, including MAX6408BS31-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6408BS31-T requirements.
6.How does Aetrix verify that MAX6408BS31-T is sourced from the original manufacturer or authorized distributors?
All MAX6408BS31-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 MAX6408BS31-T meets industry standards.
7.What is the process for return or replacement of MAX6408BS31-T?
All MAX6408BS31-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6408BS31-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 MAX6408BS31-T part is unused and in its original packaging.
Return procedure for MAX6408BS31-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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