MAX6383XR31D2+T - 3.08V µP Supervisor, SC-70-3 | Maxim Integrated
料号： MAX6383XR31D2+T ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $9.98 | $9.98 |
| 10 | $8.95 | $89.50 |
| 100 | $7.62 | $762.00 |
| 500 | $6.48 | $3,240.00 |
| 1,000 | $5.4 | $5,400.00 |
MAX6383XR31D2+T 概述
A microprocessor (µP) supervisor, also called a voltage supervisor or reset IC, is a dedicated power-management device that monitors one or more system rails and forces the host processor into a known-good state by holding it in reset whenever the rail is below a safe operating voltage. In the broader taxonomy, supervisors sit under Power Management ICs alongside voltage regulators, DC-DC converters, and battery management devices, providing deterministic power-on and brown-out behavior that bare POR (power-on reset) circuits inside a microcontroller cannot always guarantee under slow-rising or noisy rails.
Key features of the MAX6383XR31D2+T include a factory-set 3.08V threshold (suffix 31), an open-drain / open-collector active-low RESET output suitable for wired-OR with other supervisors, a minimum reset timeout of approximately 40 ms (D2 suffix), and a tiny SC-70-3 (SOT-323) footprint measuring roughly 2.0 x 2.1 mm. The wide 1.8V to 5.0V operating range covers 2.5V, 3.3V, and 5V rails, and the 3 µA quiescent current minimizes load on the monitored rail. The part is rated for -40C to +85C operation and is supplied on tape-and-reel with the +T suffix.
Internally, the device combines a precision bandgap reference, a comparator, a timeout timing block, and an open-drain MOSFET output driver. The comparator compares VCC against the internal reference; the timer block uses an internal oscillator and counter to generate the reset pulse width. Compared with a discrete RC reset circuit, this integrated approach provides tighter threshold accuracy (typically ±2.5% over temperature), immunity to capacitor leakage, and a guaranteed minimum reset pulse width that prevents processor latch-up on marginal power transitions.
Typical applications include reset supervision for 3.3V MCUs and DSPs in IoT sensor nodes, handheld medical and instrumentation devices, portable consumer electronics, and any low-power embedded design where deterministic power-on behavior is required. The small SC-70-3 footprint enables placement directly at the IC supply pin to minimize trace-induced false resets.
When designing with this part, add a pull-up resistor (typically 10 kOhm to 100 kOhm) from RESET to VCC because the output is open-drain. Place the supervisor as physically close as possible to the processor's VCC pin and bypass it with at least 0.1 µF to prevent noise-induced reset glitches.
This page synthesizes distributor pricing, drop-in supervisor alternatives from the MAX6383 family and competitors, and practical design notes not found in the standalone datasheet.
直接替换替代料： MAX6383XR31D2+T ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
MAX6383XR31D3+T
✅ 直接替换📋 参考替代料（不在目录中）
MAX6383XR31D1+T
✅ 直接替换📋 参考替代料（不在目录中）
MAX6383XR16D2+T
✅ 直接替换📋 参考替代料（不在目录中）
MAX6383XR26D2+T
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MAX6383XR46D2+T
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MAX6377XR23+
✅ 直接替换📋 参考替代料（不在目录中）
MAX6383XR31D2+T 规格参数
| 功能 | Microprocessor Supervisor (µP Reset Circuit) |
| Number of Supervisors | 1 |
| 输出类型 | Open Drain / Open Collector |
| Reset Polarity | Active Low |
| Reset Threshold (VTH) | 3.08 V (factory-trimmed, 31 suffix) |
| Operating Voltage Range (VCC) | +1.8 V to +5.0 V |
| Supply Current (ICC) | 3 µA typical at +1.8 V |
| Reset Timeout (tRP) | Minimum 40 ms (D2 timeout suffix) |
| Threshold Accuracy | ±2.5 % (over temperature) |
| 封装 / 外壳 | SC-70-3 (SOT-323), 3 pins |
| 安装类型 | Surface Mount |
| 工作温度范围 | -40 °C to +85 °C |
| Packaging | Tape & Reel (T suffix), 3000 pcs standard |
| MSL 等级 | 1 (per JEDEC J-STD-020) |
| RoHS 状态 | Compliant |
MAX6383XR31D2+T 引脚配置
| 引脚 1 | GND — Ground reference for the device |
| 引脚 2 | RESET — Active-low open-drain reset output (asserts low when VCC < VTH) |
| 引脚 3 | VCC — Supply voltage / monitored power-supply input (+1.8 V to +5.0 V) |
典型应用
MAX6383XR31D2+T 适用于 6 应用s: 3.3V Microcontroller Reset Supervision, Battery-Powered IoT Sensor Nodes, Portable Medical and Instrumentation Devices, Industrial PLC and Process Control Modules, Automotive Infotainment and Body Electronics, FPGA and DSP Configuration Supervisors.
3.3V Microcontroller Reset Supervision
The MAX6383XR31D2+T is purpose-built for 3.3V microcontroller reset supervision, where its 3.08V factory-trimmed threshold sits just below the 3.3V nominal rail to provide margin against regulator droop. Placed adjacent to the MCU's VDD pin with a 0.1µF bypass capacitor, it holds RESET low whenever VCC falls below 3.08V and maintains reset for at least 40 ms after VCC recovers, ensuring the MCU executes code only from a stable supply. The 3 µA quiescent current adds negligible load to the 3.3V rail, and the SC-70-3 footprint keeps the supervisor out of the way of densely routed MCU traces in space-constrained IoT sensor nodes, wearables, and portable instruments.
推荐
Battery-Powered IoT Sensor Nodes
In battery-powered IoT sensor nodes powered by a single lithium cell or two alkaline cells, the MAX6383XR31D2+T provides deterministic brown-out protection that prevents the microcontroller from executing code at a voltage where flash programming or SRAM retention is unreliable. Its 3 µA quiescent current is a small fraction of the MCU's sleep current, preserving battery life, while the wide 1.8V to 5.0V operating range allows the same supervisor to supervise rails from 1.8V LDO outputs to 5V boost outputs. The SC-70-3 package fits next to coin-cell holders and small Li-Ion PMICs, and the open-drain RESET output can be wire-ANDed with a watchdog timer to provide belt-and-suspenders reset coverage for unattended remote sensors.
推荐
Portable Medical and Instrumentation Devices
Handheld medical devices, blood glucose meters, and portable instrumentation require deterministic power-on behavior to meet IEC 62304 software-process requirements and FDA documentation expectations. The MAX6383XR31D2+T's ±2.5% threshold accuracy and 40 ms minimum timeout provide the predictable reset behavior that medical firmware relies on, while its 3 µA supply current preserves battery runtime in glucose meters and pulse oximeters that may sit unused for months. The SC-70-3 footprint allows the supervisor to fit alongside the analog front-end (AFE) and microcontroller in a 25 x 50 mm handheld housing, and the wide operating temperature range supports both refrigerated pharmaceutical storage and body-worn applications.
推荐
Industrial PLC and Process Control Modules
Industrial PLC digital-input modules and process-control I/O cards often supervise 24V rails stepped down to 3.3V for digital logic, where brown-out events from inductive load switching can cause MCU lockup if not properly reset. The MAX6383XR31D2+T holds reset during VCC transients, and its 3.08V threshold gives appropriate margin below the 3.3V rail while still asserting reset quickly enough to prevent SRAM corruption. The -40 °C to +85 °C operating temperature covers most industrial enclosure environments, the SC-70-3 footprint allows placement near the MCU on densely populated PLC backplanes, and the open-drain output simplifies interface to industrial MCUs that already have an internal supervisor for redundancy.
推荐
Automotive Infotainment and Body Electronics
Automotive infotainment head units, HVAC controllers, and body-electronics modules operate from a 12V battery rail stepped down to 3.3V, where load-dump transients and cold-crank events can drop the rail below safe levels. The MAX6383XR31D2+T provides supervision at the 3.3V logic rail; for harsher automotive requirements the AEC-Q100-qualified MAX6383XR-Q1 family variants are recommended, which share the same SC-70-3 footprint for layout reuse. The 40 ms timeout allows the MCU to recognize a legitimate reset versus a fast transient, and the open-drain output can be combined with the MCU's internal watchdog for two-stage reset coverage required by ISO 26262 ASIL-rated designs.
推荐
FPGA and DSP Configuration Supervisors
Low-cost FPGAs (Lattice, Gowin) and DSPs require a clean reset pulse during power-up to ensure configuration data is latched correctly, and a brown-out event mid-configuration can leave the device in an undefined state. The MAX6383XR31D2+T's 3.08V threshold correctly supervises the 3.3V core supply of these devices, and its 40 ms timeout matches the typical configuration time of small FPGAs. The open-drain RESET output can drive the FPGA's dual-purpose CONFIG_DONE or RESET pin directly through a 10 kOhm pull-up, and the SC-70-3 footprint fits next to the FPGA's supply pins on 4-layer PCBs where board area is shared with high-density signal routing.
推荐
推荐产品汇总
工程参考数据： MAX6383XR31D2+T ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | MAX6383XR31D3+T | MAX6383XR31D1+T | MAX6383XR16D2+T | MAX6383XR26D2+T | MAX6383XR46D2+T | MAX6377XR23+ |
|---|---|---|---|---|---|---|---|
| Brand | Analog Devices (Maxim) | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | SC-70-3 (SOT-323) | SC-70-3 (SOT-323) - same | SC-70-3 (SOT-323) - same | SC-70-3 (SOT-323) - same | SC-70-3 (SOT-323) - same | SC-70-3 (SOT-323) - same | SC-70-3 (SOT-323) - same |
| Reset Threshold (VTH) | 3.08 V | 3.08 V (same) | 3.08 V (same) | 1.58 V | 2.63 V | 4.63 V | 2.30 V |
| Output Type | Open-Drain Active-Low | Open-Drain Active-Low | Open-Drain Active-Low | Open-Drain Active-Low | Open-Drain Active-Low | Open-Drain Active-Low | Open-Drain Active-Low |
| Supply Current (ICC) | 3 µA typ at 1.8 V | 3 µA typ | 3 µA typ | 3 µA typ | 3 µA typ | 3 µA typ | 3 µA typ |
| Operating Voltage | 1.8 V to 5.0 V | 1.8 V to 5.0 V | 1.8 V to 5.0 V | 1.8 V to 5.0 V | 1.8 V to 5.0 V | 1.8 V to 5.0 V | 1.8 V to 5.0 V |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| RoHS Compliance | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant |
关键差异点
- Wider timeout selection with identical footprint （对比 MAX6383XR31D3+T)
- Lower-voltage sibling available for 1.8V rails （对比 MAX6383XR16D2+T)
- Open-drain output enables wired-OR reset stacking （对比 MAX6377XR23+)
设计说明
Because the RESET output is open-drain, an external pull-up resistor of 10 kOhm to 100 kOhm must be added between the RESET pin and the VCC rail being monitored. Choose a smaller resistor (10 kOhm) when the MCU reset pin has significant capacitance or when fast rise time is critical; choose a larger value (100 kOhm) to minimize current draw in battery-powered applications. Never connect the pull-up to a different supply than the supervisor's VCC, otherwise the output may not reach a valid logic-high when VCC is below the threshold and the pull-up rail is still active, creating a phantom-high reset condition.
Place the MAX6383XR31D2+T as physically close as possible to the MCU or processor VCC pin it supervises, and add a 0.1 µF X7R ceramic bypass capacitor directly between the supervisor's VCC pin and ground. Long VCC traces add parasitic inductance that can cause the supervisor to see a momentary dip during load transients and falsely assert reset. For noisy environments (near switching regulators or motor drivers), add a small RC filter (10 Ohm + 1 µF) between the MCU VCC rail and the supervisor VCC pin to prevent false resets from high-frequency noise.
Do not exceed the absolute maximum VCC of 6.0 V on the MAX6383XR31D2+T. Do not leave the RESET output floating - the open-drain design requires the pull-up resistor for proper operation. Be aware that selecting a supervisor with a threshold too close to the nominal rail (within 100 mV) can cause chattering reset on lightly loaded regulators; the 3.08V threshold on this part gives approximately 220 mV margin below a 3.3V nominal rail, which is appropriate. For 5V rails, choose a higher-threshold variant such as MAX6383XR46D2+T (4.63V).
合规信息
RoHS and REACH compliance per Maxim Integrated / Analog Devices product page. Standard part is not AEC-Q100 qualified; for AEC-Q100 automotive grade see MAX6383XR-Q1 family variants in the same SC-70-3 footprint.
