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Analog Devices Inc./Maxim Integrated MAX837EUS
- Part No.:
- MAX837EUS
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX837EUS.pdf
- Description:
- IC SUPERVISOR MICROPWR VOLT MON
- Quantity:
- Payment:
- Shipping:
Inventory:26,169
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Product details
Overview
MAX837EUS from Maxim Integrated is a 4-pin micropower voltage monitor IC with push-pull output, precision 1.204V internal bandgap reference, ±1.25% trip threshold accuracy, <5µA typical supply current, and operation over 2.5V to 11.0V VCC range. It functions as a system reset supervisor or battery voltage threshold detector in portable instrumentation and low-power embedded systems.
For engineers reviewing the MAX837EUS datasheet, MAX837EUS pinout, MAX837EUS application, or MAX837EUS equivalent, key selection criteria include its push-pull output drive capability, guaranteed hysteresis of 6mV, SOT143-4 package compatibility, and ability to monitor voltages independent of VCC using external resistor dividers.
Technical Context
The MAX837EUS integrates a high-impedance comparator with its noninverting input (IN) referenced to an internal 1.204V bandgap source, enabling precise external trip-voltage programming via two resistors. Its push-pull output actively drives high and low states without requiring external pull-up components.
It operates across -40°C to +85°C, supports IN voltage up to VCC − 1V, exhibits 80µs propagation delay at 5V, and maintains stable trip threshold over temperature (±0.5mV/°C drift). Input leakage remains ≤±12nA across full VCC and VIN ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Trip Threshold Voltage | 1.204V ±1.25% - sets accurate detection point for external resistor-divider networks |
| Hysteresis | 6mV - provides noise immunity against false triggering near threshold |
| Supply Current | <5µA typical - enables multi-year battery life in always-on monitoring applications |
| VCC Operating Range | 2.5V to 11.0V - supports single-cell Li-ion, dual-cell alkaline, and industrial 3.3V/5V rails |
| Output Type | Push-pull - eliminates need for external pull-up resistor; sinks/sourced 500µA at VOL/VOL |
| Propagation Delay | 80µs at 5V - ensures timely response for reset or load-switch control timing budgets |
| IN Leakage Current | ±12nA max - preserves accuracy with high-value resistor dividers (e.g., 1MΩ) |
Pinout & Package
SOT143-4 (U4-1) package: 1.3mm × 1.3mm × 0.9mm body, gull-wing leads, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | System ground reference | Return path for internal reference and comparator; must be low-impedance connection |
| VCC (Pin 2) | Positive supply input | Power source for internal circuitry; also defines upper limit for monitored voltage (VIN ≤ VCC − 1V) |
| IN (Pin 3) | Noninverting comparator input | Accepts divided-down voltage from external resistor network; high-impedance (≤12nA leakage) |
| OUT (Pin 4) | Push-pull output driver | Active-high/low digital output; drives logic inputs directly; no external pull-up required |
Key Features
| Feature | Design Value |
|---|---|
| Precision bandgap reference | 1.204V ±1.25% - enables accurate, temperature-stable trip points without calibration |
| Ultra-low quiescent current | <5µA - minimizes standby power loss in battery-critical designs |
| Programmable trip voltage | Set by two external resistors - supports custom thresholds from ~1.3V to >10V |
| Integrated hysteresis | 6mV fixed - prevents oscillation during slow-rising/falling input transitions |
| Wide VCC range | 2.5V–11.0V - accommodates diverse supply topologies without external regulators |
Applications
| Precision Battery Monitor | Load Switching |
|---|---|
|
Use Scenario: Monitoring single-cell Li-ion battery voltage to trigger low-battery warning before deep discharge. IC Role / Device Role / Timing Role: Voltage threshold detector generating active-low signal when cell drops below 3.0V. Use Value: Enables safe cutoff at 3.0V using R1=499kΩ/R2=1MΩ divider; 6mV hysteresis prevents chatter near threshold. |
Use Scenario: Enabling/disabling power to peripheral modules based on system voltage stability. IC Role / Device Role / Timing Role: Reset supervisor asserting enable signal only after VCC exceeds 4.63V. Use Value: Push-pull output directly drives MOSFET gate; 80µs delay ensures clean power-rail qualification. |
| Threshold Detectors | Heater Temperature Control |
|
Use Scenario: Detecting overvoltage condition on 5V rail to initiate shutdown sequence. IC Role / Device Role / Timing Role: High-side comparator monitoring VCC through resistor divider. Use Value: Trip set to 5.5V with 1% resistor tolerance; ±1.25% threshold accuracy ensures consistent protection margin. |
Use Scenario: Cycling heater element ON/OFF based on thermistor feedback in environmental chamber. IC Role / Device Role / Timing Role: Comparator comparing thermistor-divided voltage against 1.204V reference. Use Value: 6mV hysteresis creates ~2°C thermal deadband; push-pull output drives gate of n-channel MOSFET directly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV809E33DBZR | Fixed 3.3V threshold; open-drain output; 0.5µA supply current; SOT-23-3 package | Not programmable; requires external pull-up; unsuitable for sub-3.3V monitoring | Select when fixed 3.3V reset is sufficient and ultra-low current (<1µA) is critical |
| TPS3808G33DBVR | Adjustable threshold via resistor divider; open-drain output; 1.8µA supply current; SOT-23-6 package | Larger footprint; requires external pull-up; higher propagation delay (200µs) | Select when wider adjustment range (0.4V–5.0V) and tighter threshold tolerance (±0.5%) are required |
Compared with TLV809E33DBZR and TPS3808G33DBVR, the MAX837EUS offers programmable trip voltage with push-pull output in a compact 4-pin SOT143, eliminating pull-up components while supporting lower-VCC monitoring down to 2.5V - ideal for space-constrained, multi-rail battery systems.
Availability
MAX837EUS is available at Aetrix Electronics and suitable for precision battery monitors, load switching circuits, and threshold detectors requiring stable component supply, long-term manufacturability, and lead-free compliance.
Supply support for MAX837EUS 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 management, sensing, and interface applications in industrial, medical, and portable electronics.
The MAX836/MAX837 family was engineered specifically for micropower voltage supervision in battery-powered systems, emphasizing ultra-low current consumption, small footprint, and flexible external threshold configuration.
FAQ
What is the output structure of the MAX837EUS?
The MAX837EUS features a push-pull output stage that actively drives both high and low states without requiring an external pull-up resistor. This differs from the open-drain MAX836EUS and allows direct interfacing with CMOS logic inputs. The MAX837EUS can source up to 500µA and sink up to 500µA while maintaining VOH ≥ VCC − 0.5V and VOL ≤ 0.4V under specified conditions.
Can the MAX837EUS monitor voltages higher than its VCC supply?
No - the MAX837EUS cannot monitor voltages exceeding VCC. Its IN pin has an absolute maximum rating of VCC + 0.3V, and the datasheet specifies VIN ≤ VCC − 1V for proper operation. To monitor higher voltages, a resistor divider must scale the input down to within this range. The MAX837EUS itself does not support high-side monitoring beyond its own supply rail.
What is the minimum recommended resistor value for programming the trip voltage on the MAX837EUS?
The datasheet recommends selecting R2 between 500kΩ and 1MΩ to minimize current consumption while preserving accuracy. With R2 = 1MΩ and desired VTRIP = 4.63V, R1 calculates to 2.87MΩ. Resistor values must ensure ≥500nA current through the divider to overcome the 12nA max input bias current and maintain ±1.25% threshold accuracy. Lower values increase power draw unnecessarily.
Does the MAX837EUS require an external capacitor for stable operation?
A 0.1µF bypass capacitor is recommended between VCC and GND, placed as close as possible to the MAX837EUS pins. This capacitor suppresses supply noise and improves immunity to fast transients, especially important given the device's high input impedance and sensitivity to threshold accuracy. No capacitor is required on the IN or OUT pins for basic functionality.
How does hysteresis work in the MAX837EUS, and can it be adjusted?
The MAX837EUS includes a fixed 6mV internal hysteresis to prevent output oscillation when the input voltage lingers near the trip point. This hysteresis is not user-adjustable but may be augmented externally using a feedback resistor (R3) as shown in Figure 2 of the datasheet. External hysteresis increases total hysteresis additively and improves noise rejection in electrically noisy environments.
MAX837EUS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 1.2V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-4
MAX837EUS FAQ
1.How can I place an order for MAX837EUS through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX837EUS 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 MAX837EUS reliable?
The price and inventory of MAX837EUS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX837EUS is usually 5 days.
3.What payment methods are accepted for MAX837EUS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX837EUS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX837EUS?
MAX837EUS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX837EUS 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 MAX837EUS?
For technical support, including MAX837EUS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX837EUS requirements.
6.How does Aetrix verify that MAX837EUS is sourced from the original manufacturer or authorized distributors?
All MAX837EUS 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 MAX837EUS meets industry standards.
7.What is the process for return or replacement of MAX837EUS?
All MAX837EUS units undergo pre-shipment inspection (PSI). If there is an issue with MAX837EUS, 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 MAX837EUS part is unused and in its original packaging.
Return procedure for MAX837EUS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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