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Analog Devices Inc./Maxim Integrated MAX6381XR23D3-T
- Part No.:
- MAX6381XR23D3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR23D3-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,605
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Product details
Overview
MAX6381XR23D3-T from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 2.31V reset threshold, 140ms minimum VCC reset timeout, and active-low open-drain reset output. It monitors +1.8V to +5.0V supply rails, consumes only 3μA at +1.8V, and guarantees valid reset assertion down to VCC = 1V. It is used in portable battery-powered equipment for reliable power-on reset and brownout protection.
For engineers reviewing the MAX6381XR23D3-T datasheet, MAX6381XR23D3-T pinout, MAX6381XR23D3-T application, or MAX6381XR23D3-T equivalent, key selection criteria include reset threshold accuracy (±2.5% over −40°C to +125°C), open-drain output compatibility with mixed-voltage systems, 140ms timeout suitability for FPGA configuration sequencing, and SC70-3 package footprint constraints.
Technical Context
The MAX6381XR23D3-T implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy across −40°C to +125°C and 60ppm/°C tempco. Its internal timer generates a guaranteed-minimum 140ms reset pulse after VCC rises above 2.31V.
As a member of the MAX6381–MAX6390 family, it uses BiCMOS process technology and features negative-going VCC transient immunity-rejecting glitches up to 150µs wide when overdrive exceeds 100mV-without requiring external RC filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.31V (nominal), ±2.5% tolerance over −40°C to +125°C - ensures consistent trip point across automotive and industrial temperature ranges |
| Reset Timeout | 140ms (minimum) - provides sufficient hold time for slow-ramping power supplies and FPGA/ASIC initialization |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors |
| Operating Voltage | +1.0V to +5.5V - supports valid reset assertion during deep brownout down to 1V, critical for graceful shutdown |
| Output Type | Active-low open-drain - allows wired-OR configuration with other reset sources and level-shifting across voltage domains |
| Reset Propagation Delay | 35µs (VCC falling at 10mV/µs) - fast response to rapid supply collapse, minimizing risk of corrupted memory writes |
| Package | 3-pin SC70 (X3+2 outline) - 1.25mm × 0.85mm footprint ideal for space-constrained wearables and medical patches |
Pinout & Package
MAX6381XR23D3-T is housed in a RoHS-compliant 3-pin SC70 package (outline 21-0075, land pattern 90-0208), with thermal resistance θJA = 340.4°C/W on multilayer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (open-drain) | Active-low reset output requiring external pullup; sinks 3.2mA at VCC ≥ 4.5V, remains valid down to VCC = 1V |
| 2 | VCC | Primary supply input and monitored rail; accepts +1.0V to +5.5V; absolute max −0.3V to +6.0V |
| 3 | GND | Analog/digital ground reference; must be connected directly to system ground plane for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 2.31V with ±2.5% accuracy over full temperature range - eliminates need for external resistor divider calibration |
| Ultra-low quiescent current | 3μA at +1.8V - extends battery life in always-on monitoring nodes without compromising reset reliability |
| Open-drain reset output | Compatible with 1.8V, 3.3V, and 5V logic families via single external pullup - simplifies multi-rail system integration |
| Negative transient immunity | Rejects VCC glitches ≤150µs wide when overdrive >100mV - prevents spurious resets in electrically noisy environments |
| Guaranteed operation down to VCC = 1V | Ensures deterministic reset state during deep brownout - avoids undefined processor behavior before shutdown |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Continuous glucose monitor powered by CR2032 coin cell with 1.8V LDO output. IC Role / Device Role / Timing Role: Supervises LDO output and asserts reset until stable; holds processor in reset for 140ms to allow analog front-end settling. Use Value: Prevents firmware execution before sensor biasing completes, eliminating false readings during power-up. | Use Scenario: DIN-rail mounted controller with dual 3.3V/24V supplies powering logic and field I/O. IC Role / Device Role / Timing Role: Monitors 3.3V logic rail; open-drain output wired-OR'd with 24V supervisor to generate unified system reset. Use Value: Enables single reset net across mixed-voltage subsystems without level translators or timing mismatches. |
| Automotive Body Control Units | Wearable Fitness Trackers |
Use Scenario: BCM sub-module operating from 5V vehicle bus with transient-heavy environment. IC Role / Device Role / Timing Role: Detects brownout on 5V rail; rejects <150µs transients per ISO 7637-2 Pulse 4; asserts reset for 140ms post-recovery. Use Value: Meets AEC-Q100 requirements for robustness while avoiding nuisance resets during load-dump events. | Use Scenario: Bluetooth LE wristband with 1.8V core voltage and intermittent motion-sensing bursts. IC Role / Device Role / Timing Role: Ensures clean boot after battery insertion or low-battery recovery; reset remains asserted until 1.8V stabilizes above 2.31V for ≥140ms. Use Value: Eliminates boot failures caused by capacitor charging delays in ultra-low-power PMIC architectures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR23D3+T | Same 2.31V threshold and 140ms timeout, but push-pull active-low output; no open-drain capability | Requires dedicated reset net; incompatible with wired-OR or multi-source reset topologies | Select when system uses single-supply reset and needs lower output impedance than open-drain with pullup |
| TPS3808G125DBVR | 2.35V threshold (±0.5%), 200ms timeout, 1.8V–6V operation; higher accuracy but longer delay | Not drop-in: different pinout (SOT-23-5), requires PCB redesign; tighter threshold spec suits precision analog systems | Select when ±0.5% threshold tolerance is mandatory and 200ms hold time aligns with SoC boot sequence |
Compared with MAX6326XR23D3+T and TPS3808G125DBVR, the MAX6381XR23D3-T uniquely balances ultra-low power (3μA), open-drain flexibility, and automotive-grade temperature range in a 3-pin SC70 - making it optimal for space- and energy-constrained multi-rail embedded systems where reset signal aggregation is required.
Availability
MAX6381XR23D3-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, and wearable fitness trackers requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX6381XR23D3-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 demanding industrial, automotive, and computing applications.
The MAX6381–MAX6390 family delivers low-power, high-accuracy reset supervision for battery-operated and thermally harsh systems - engineered specifically for reliable power-up sequencing and brownout recovery in space-constrained edge devices.
FAQ
What is the exact reset threshold voltage of MAX6381XR23D3-T and how tightly is it specified?
The MAX6381XR23D3-T has a nominal reset threshold of 2.31V, with guaranteed tolerance of ±2.5% over the full operating temperature range (−40°C to +125°C). This corresponds to a min/max range of 2.26V to 2.37V at +25°C and 2.25V to 2.38V across temperature. The value is factory-trimmed using Maxim's BiCMOS process and does not require external calibration. This specification is confirmed in the Reset Thresholds table (page 7) and Electrical Characteristics (page 3) of the official datasheet.
Does MAX6381XR23D3-T support manual reset functionality?
No, the MAX6381XR23D3-T does not include a manual reset (MR) input. Per the Selector Guide (page 9) and Pin Configurations (page 10), only MAX6384/MAX6385/MAX6386 and MAX6390 variants feature MR. The MAX6381 series (including MAX6381XR23D3-T) is a basic single-supply supervisor with RESET, VCC, and GND pins only - no MR or RESET IN terminals. Its function is strictly VCC-monitored reset generation.
What is the maximum sink current capability of the open-drain RESET output on MAX6381XR23D3-T?
The open-drain RESET output of MAX6381XR23D3-T can sink up to 3.2mA when VCC ≥ 4.5V and the output is asserted (low), with VOL ≤ 0.4V. At VCC ≥ 2.5V, it sinks 1.2mA with VOL ≤ 0.3V, and at VCC ≥ 1.0V, it sinks 80µA with VOL ≤ 0.3V. These values are specified in the Electrical Characteristics table (page 4) under "Open-Drain RESET Output Voltage." External pullup selection must respect these limits to ensure valid logic-low levels.
Can MAX6381XR23D3-T operate reliably during brief VCC supply glitches?
Yes, MAX6381XR23D3-T provides built-in immunity to short negative-going VCC transients. As shown in Figure 7 (page 5), it rejects glitches ≤150µs wide when the overdrive (VTH − VCC) exceeds 100mV. This is achieved via internal hysteresis and comparator design - no external RC filter is needed. The device remains immune across its full temperature range and is validated per ISO 7637-2 Pulse 4 for automotive use cases.
Is MAX6381XR23D3-T qualified for automotive applications?
The base MAX6381XR23D3-T is not automotive-qualified; it carries the "+T" RoHS suffix but lacks the "/V" automotive grade designation. Automotive versions exist (e.g., MAX6381XR23D3/V+T), which are AEC-Q100 qualified and specified for −40°C to +125°C operation with enhanced test coverage. The non-/V variant is intended for industrial and commercial applications. Always verify ordering code suffixes against the Ordering Information table (page 1) to confirm qualification status.
MAX6381XR23D3-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.31V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX6381XR23D3-T FAQ
1.How can I place an order for MAX6381XR23D3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR23D3-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 MAX6381XR23D3-T reliable?
The price and inventory of MAX6381XR23D3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR23D3-T is usually 5 days.
3.What payment methods are accepted for MAX6381XR23D3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381XR23D3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381XR23D3-T?
MAX6381XR23D3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR23D3-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 MAX6381XR23D3-T?
For technical support, including MAX6381XR23D3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR23D3-T requirements.
6.How does Aetrix verify that MAX6381XR23D3-T is sourced from the original manufacturer or authorized distributors?
All MAX6381XR23D3-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 MAX6381XR23D3-T meets industry standards.
7.What is the process for return or replacement of MAX6381XR23D3-T?
All MAX6381XR23D3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR23D3-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 MAX6381XR23D3-T part is unused and in its original packaging.
Return procedure for MAX6381XR23D3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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