MAX1361MEUB+ - 10-Bit 4-Ch 150ksps ADC/Supervisor | Maxim
MPN: MAX1361MEUB+ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.1 | $7.10 |
| 10 | $6.4 | $64.00 |
| 100 | $5.55 | $555.00 |
| 500 | $4.78 | $2,390.00 |
| 1,000 | $4.1 | $4,100.00 |
MAX1361MEUB+ Overview
A system monitor (also called an analog supervisor or ADC-with-window-comparator) is an integrated data-acquisition IC that combines a multi-channel ADC, a precision voltage reference, and a programmable threshold detector in a single die. It continuously digitizes analog system parameters (rail voltages, currents via shunt, temperatures via remote diodes) and asserts a hardware interrupt when any reading falls outside a user-defined window. System monitors sit at the bottom of the power-management hierarchy, above simple comparators and below full system-on-chip PMICs.
The MAX1361MEUB+ integrates a 2.048 V internal reference (the MAX1362 variant uses 4.096 V for higher dynamic range), a 4-input analog mux, and a 2-wire SMBus interface. The programmable trip window allows engineers to define independent upper and lower thresholds on each channel without host intervention, freeing the host CPU from polling. The ALERT output follows the SMBus Alert Response Address protocol, supporting multi-device shared interrupt lines.
Typical applications include battery-cell voltage monitoring in portable medical and IoT devices, multi-rail power-supply supervision in servers and telecom hardware, front-end digitizing for system health monitors, and industrial process-control analog input modules. The combination of low Iq, internal reference, and 4 single-ended inputs reduces external BOM to a minimum.
When laying out the PCB, keep analog traces short and shield the SMBus lines with a ground guard to maintain noise immunity on the reference. Decouple AVDD and DVDD with 0.1 μF ceramics placed within 3 mm of the respective pins.
Drop-in alternatives for MAX1361MEUB+ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with MAX1361MEUB+ (same form factor and footprint) — differing in Package, Resolution, Interface, Sampling Rate, Input Voltage Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MAX1362MEUB+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX1363MEUB+
✅ Drop-In✓ In Stock
$4.34 / Unit
View Datasheet →MAX1364MEUB+
✅ Drop-In✓ In Stock
$4.65 / Unit
View Datasheet →MAX1361MEUB+T
✅ Drop-In✓ In Stock
$3.41 / Unit
View Datasheet →MAX1361EUB+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX1162ACUB+T
✅ Drop-In✓ In Stock
$5.74 / Unit
View Datasheet →MAX1361MEUB+ Maximum Ratings & Electrical Characteristics
| Resolution | 10 bit |
| Number of Channels | 4 (single-ended) / 2 (pseudo-differential) |
| Sampling Rate | 150 ksps |
| Architecture | SAR |
| Internal Reference Voltage | 2.048 V |
| Input Voltage Range | 0 to 3.6 V |
| Supply Voltage | 2.7 V to 3.6 V |
| Interface | SMBus / I2C-compatible 2-wire serial |
| Window Comparator | Programmable upper/lower thresholds per channel |
| Alert Output | SMBus Alert Response Address (ARA) compliant |
| Package | 10-pin μMAX (uSOP) |
| Operating Temperature | -40 °C to +85 °C (extended) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
MAX1361MEUB+ Pin Configuration
| Pin 1 | AIN1 — Analog input channel 1 |
| Pin 2 | AIN2 — Analog input channel 2 |
| Pin 3 | AIN3 — Analog input channel 3 |
| Pin 4 | AIN4 — Analog input channel 4 |
| Pin 5 | GND — Ground |
| Pin 6 | SDA — SMBus serial data |
| Pin 7 | SCL — SMBus serial clock |
| Pin 8 | ALERT — SMBus alert / interrupt output (active low, open-drain) |
| Pin 9 | DVDD — Digital supply voltage |
| Pin 10 | AVDD — Analog supply voltage |
Typical Applications
MAX1361MEUB+ is suitable for 6 applications: Battery Cell Voltage Monitoring, Multi-Rail Power Supply Supervision, Industrial Process Control Analog Input Module, Portable Medical Patient Monitor, IoT Edge Sensor Node, Front-End Digitizer for System Health Monitor.
Battery Cell Voltage Monitoring
The MAX1361MEUB+ monitors individual Li-ion/polymer cells or stacked battery packs with its 4 single-ended ADC inputs, each handling 0-3.6 V directly. The 2.048 V internal reference produces a 2 mV LSB, sufficient for ±1 % SOC estimation in 1S-4S packs. The programmable window comparator asserts ALERT autonomously when any cell drifts out of safe range, freeing the host MCU from polling. Quiescent current in the microamp range keeps the monitor active even in deep-sleep shipping modes.
Recommended
Multi-Rail Power Supply Supervision
The MAX1361MEUB+ supervises 3.3 V, 2.5 V, 1.8 V, and 1.0 V rails in servers, routers, and telecom hardware via its 4-channel mux. Each rail is assigned an independent upper/lower threshold in the device registers, and the SMBus ALERT output asserts to the host ASIC the moment a rail drifts. The 150 ksps sampling rate handles dynamic load-step events on each rail. Hardware autonomous alerting means the host CPU can sleep until an actual fault occurs.
Recommended
Industrial Process Control Analog Input Module
The MAX1361MEUB+ digitizes 4-20 mA current-loop or 0-10 V field signals in PLC analog-input modules, scaling through external resistor dividers into its 0-3.6 V input range. The 2.048 V internal reference eliminates an external reference IC on the module BOM. SMBus interface simplifies wiring back to the module's MCU. Industrial -40 °C to +85 °C operating range supports outdoor cabinet installations without derating.
Recommended
Portable Medical Patient Monitor
The MAX1361MEUB+ monitors battery voltage, signal-rail supply, and analog front-end reference in handheld patient monitors and pulse oximeters. The microamp-level quiescent current extends battery life across multi-day patient-monitoring sessions. The hardware window comparator ensures critical supply rails cannot drift without immediate ALERT notification. The 10-pin μMAX package fits in compact handheld form factors.
Recommended
IoT Edge Sensor Node
The MAX1361MEUB+ digitizes temperature, humidity, light, and battery voltage from multiple sensor channels in low-power wireless IoT nodes. The 150 ksps sampling rate is overkill for slow sensor signals but leaves headroom for fast transients on power rails. SMBus Alert Response allows multiple MAX1361 devices to share a single interrupt line, scaling to 8 or 12 channel nodes. Deep sleep modes minimize energy per sample.
Recommended
Front-End Digitizer for System Health Monitor
The MAX1361MEUB+ serves as the analog front end for system health monitors in networking switches and storage arrays, digitizing fan tachometer-derived voltage, internal temperature sensor outputs, and supply telemetry. The hardware window comparator runs independently of the host CPU, providing fault detection even during host firmware boot or recovery states. The 10-pin μMAX package minimizes board area in high-density backplane designs.
Recommended
Recommended Products Summary
Engineering reference data for MAX1361MEUB+ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX1362MEUB+ | MAX1363MEUB+ | MAX1364MEUB+ | MAX1162ACUB+T |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 10-pin μMAX | 10-pin μMAX - same | 10-pin μMAX - same | 10-pin μMAX - same | 10-pin μMAX - same |
| Resolution | 10 bit | 10 bit | 12 bit | 12 bit | 16 bit |
| Architecture | SAR | SAR | SAR | SAR | Delta-Sigma |
| Interface | SMBus / I2C | SMBus / I2C | SMBus / I2C | SMBus / I2C | SPI (not SMBus) |
| Programmable Window Comparator | Yes (per channel) | Yes (per channel) | Yes (per channel) | Yes (per channel) | No |
Key Differentiators
- Integrated programmable window comparator with SMBus Alert Response (vs MAX1162ACUB+T)
- Higher dynamic range via 4.096 V internal reference (vs MAX1362MEUB+)
- Drop-in 12-bit upgrade path (vs MAX1363MEUB+ / MAX1364MEUB+)
- Lower power than 16-bit delta-sigma equivalents (vs MAX1162ACUB+T)
Design Notes
Decouple AVDD and DVDD with separate 0.1 μF ceramic capacitors placed within 3 mm of their respective pins. AVDD should be filtered through a ferrite bead if the analog and digital supplies are derived from the same rail. The MAX1361MEUB+ draws microamp-level quiescent current but requires adequate bypass capacitance during SAR conversion events; insufficient decoupling manifests as degraded INL and erratic ALERT assertions.
Route the analog input traces (AIN1-AIN4) over a continuous ground plane and away from the SCL/SCL traces to minimize digital coupling. Place the device near the sensor or supply rail being monitored to avoid long analog traces that pick up EMI. For multi-channel designs, use a star-ground pattern centered on the MAX1361MEUB+ GND pin. The exposed pad (if present in the variant) must be soldered to the ground plane for thermal dissipation.
The SMBus interface lines (SCL, SDA, ALERT) are open-drain and require external pull-up resistors in the 2.2-10 kΩ range depending on bus capacitance. For multi-device SMBus Alert Response configurations, use 4.7 kΩ pull-ups and verify the rise time at the slowest expected load. ALERT is asserted low when any channel crosses its threshold; the host reads the ARA (Alert Response Address) to identify which MAX1361 asserted.
Do not apply voltages beyond AVDD + 0.3 V or below GND - 0.3 V on any AIN pin, or the input ESD structure will forward-bias. Verify the input divider scaling before connecting to high-voltage rails. The internal 2.048 V reference is not accessible externally, so calibration must use AVDD or a separate system reference. Do not assume channel-to-channel isolation is infinite - the mux crosstalk typically exceeds -60 dB at 150 ksps, which can matter for adjacent high-impedance sensors.
Compliance Information
RoHS compliant per Maxim/Analog Devices product page (the '+' suffix denotes lead-free / RoHS-compliant finish). AEC-Q100 not qualified - not intended for automotive safety applications. Halogen-free status not explicitly stated in available data.
