My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6381XR26D4-T
- Part No.:
- MAX6381XR26D4-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR26D4-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,077
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6381XR26D4-T from Maxim Integrated is a low-power microprocessor supervisory circuit in 3-pin SC70 package, featuring a factory-set 2.63V reset threshold (±2.5% over -40°C to +125°C), 1120ms minimum VCC reset timeout, and active-low open-drain reset output. It monitors single-supply voltages from +1.8V to +5.0V with only 3μA supply current at +1.8V and guarantees valid reset state down to VCC = 1V - used in battery-powered embedded controllers requiring reliable brownout detection.
For engineers reviewing the MAX6381XR26D4-T datasheet, MAX6381XR26D4-T pinout, MAX6381XR26D4-T application, or MAX6381XR26D4-T equivalent, key selection criteria include reset threshold accuracy, timeout timing granularity, open-drain drive capability with external pullup, low-voltage operation stability, and automotive-grade availability via /V suffix variants.
Technical Context
The MAX6381XR26D4-T implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy across -40°C to +125°C and 60ppm/°C tempco, paired with a monotonic RC-based timeout timer delivering guaranteed 1120ms minimum assertion after VCC recovery. Its open-drain RESET output requires an external pullup and remains functional down to VCC = 1V, enabling robust reset signaling during deep brownout conditions.
No manual reset (MR) input or auxiliary RESET IN comparator is integrated - this variant belongs to the base MAX6381 family subset (not MAX6384/MAX6385/MAX6386 or MAX6387/MAX6388/MAX6389), confirming fixed single-supply monitoring without user-adjustable inputs or debounced control pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V nominal (2.56V min / 2.69V max at +25°C); ±2.5% tolerance over full temperature range ensures consistent brownout detection across industrial environments. |
| VCC Reset Timeout | 1120ms minimum; guarantees μP remains held in reset long enough for power rails to stabilize after recovery from undervoltage events. |
| Supply Current | 3μA at +1.8V; enables multi-year operation in coin-cell–powered IoT sensors and portable instrumentation without compromising supervision integrity. |
| Operating Voltage Range | +1.0V to +5.5V; supports valid reset assertion even during severe brownout down to 1V, critical for fail-safe system initialization. |
| Output Type | Active-low open-drain; requires external pullup resistor, allowing level-shifting and wired-OR configuration with other reset sources. |
| Temperature Range | -40°C to +125°C; qualified for under-hood automotive, industrial PLC, and high-reliability embedded applications. |
| Reset Propagation Delay | 35μs (VCC falling at 10mV/µs); fast response to rapid transients prevents spurious code execution during power glitches. |
Pinout & Package
Package: 3-pin SC70 (Outline 21-0075, Land Pattern 90-0208), footprint-compatible with industry-standard low-pin-count supervisory ICs and optimized for space-constrained PCB layouts.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (open-drain) | Active-low reset signal output; sinks current when asserted; requires external pullup to VCC or another logic rail for proper logic-level translation. |
| 2 | VCC | Main supply input and monitored voltage source; powers internal circuitry and serves as primary reset trigger reference. |
| 3 | GND | Analog and digital ground reference; must be connected to low-impedance system ground plane to ensure accurate threshold sensing and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 2.63V with ±2.5% accuracy over -40°C to +125°C eliminates need for external resistor dividers or calibration in production. |
| Ultra-low quiescent current | 3μA at +1.8V enables integration into always-on battery-backed systems without measurable impact on shelf life. |
| Guaranteed reset validity down to VCC = 1V | Ensures deterministic μP reset assertion even during deep undervoltage faults where most competitors lose functionality. |
| Negative-going VCC transient immunity | Rejects sub-100ns glitches below reset threshold - validated by Maximum Transient Duration vs. Overdrive curve in datasheet. |
| Open-drain output architecture | Supports flexible voltage-level interfacing and multi-source reset bus configurations without contention risk. |
Applications
| Power Monitoring in Portable Equipment | Dual-Voltage System Supervision |
|---|---|
Use Scenario: Monitoring Li-ion battery discharge in handheld medical devices to prevent data corruption during low-battery shutdown. IC Role / Device Role / Timing Role: Single-supply supervisor asserting open-drain RESET to halt MCU execution before VCC drops below safe operating margin. Use Value: 2.63V threshold aligns precisely with common 2.7V brownout cutoffs; 1120ms timeout ensures complete flash write completion before reset release. | Use Scenario: Coordinating power sequencing between core and I/O rails in FPGA-based edge AI accelerators. IC Role / Device Role / Timing Role: Primary VCC monitor for main 3.3V supply, with open-drain output tied to secondary supervisor's MR input for cascaded reset propagation. Use Value: Open-drain interface allows direct wire-OR with other reset sources; guaranteed 1V operation ensures reset integrity even if auxiliary rail collapses first. |
| Industrial Controller Brownout Protection | Automotive Body Control Module (BCM) |
Use Scenario: Preventing erratic behavior in programmable logic controllers exposed to 24V supply fluctuations in factory automation. IC Role / Device Role / Timing Role: Dedicated reset generator for ARM Cortex-M7 host processor, triggered exclusively by 24V-to-3.3V LDO output. Use Value: ±2.5% threshold accuracy over -40°C to +125°C maintains tight trip point despite ambient thermal cycling in uncooled enclosures. | Use Scenario: Ensuring deterministic startup of LIN transceivers and EEPROM in automotive door modules subjected to cold-crank conditions. IC Role / Device Role / Timing Role: AEC-Q100 qualified supervisory circuit monitoring 5V domain; provides clean reset pulse after battery recovers from <6V cranking dip. Use Value: 1120ms timeout exceeds typical post-crank stabilization time; SC70 package meets stringent automotive board-space constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3-T | 2.93V reset threshold (±2%), 240ms timeout, SOT23-3 package, no automotive qualification. | Lacks AEC-Q100 rating and extended temperature support; suitable only for commercial-grade consumer electronics. | Select when cost sensitivity outweighs automotive/industrial reliability requirements and 2.93V threshold matches system design. |
| TLV809KDBZR | 2.63V threshold (±1.5%), 140ms timeout, SOT23-3, 1.8–6V operation, no AEC-Q100. | Shorter timeout limits use in systems requiring extended hold time; lower threshold tolerance improves precision but lacks high-temp validation. | Prefer for battery-powered wearables needing tighter threshold spec but not demanding 1120ms assertion or -40°C to +125°C operation. |
Compared with MAX809TRD3-T and TLV809KDBZR, the MAX6381XR26D4-T uniquely combines automotive-grade temperature range, precise 2.63V threshold with wide-temp accuracy, and long 1120ms timeout - making it optimal for industrial and automotive applications where extended reset hold time and environmental robustness are mandatory.
Availability
MAX6381XR26D4-T is available at Aetrix Electronics and suitable for industrial controllers, automotive body electronics, and portable medical instrumentation requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6381XR26D4-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, mixed-signal, and power management ICs for high-reliability industrial, automotive, and communications systems.
The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy voltage supervision for microprocessor-based systems where deterministic reset behavior under brownout, cold-crank, and battery-depletion conditions is mission-critical.
FAQ
What is the exact reset threshold voltage of the MAX6381XR26D4-T and how stable is it over temperature?
The MAX6381XR26D4-T has a nominal reset threshold of 2.63V, with a minimum of 2.56V and maximum of 2.69V at +25°C. Over the full -40°C to +125°C operating range, the threshold maintains ±2.5% accuracy (i.e., 2.56V to 2.69V tolerance band shifts proportionally), supported by a 60ppm/°C tempco - verified in the Electrical Characteristics table and Typical Operating Characteristics plots. This stability ensures repeatable brownout detection in automotive and industrial environments where ambient temperature varies widely.
Does the MAX6381XR26D4-T include a manual reset (MR) input or auxiliary voltage monitor?
No, the MAX6381XR26D4-T does not include a manual reset (MR) input or auxiliary RESET IN comparator. It belongs to the base MAX6381 series (not MAX6384/MAX6385/MAX6386 or MAX6387/MAX6388/MAX6389), confirmed by the Selector Guide and Pin Configurations section. Its functionality is limited to single-supply VCC monitoring with open-drain active-low reset output - all MR and RESET IN features are absent in this specific variant.
What is the meaning of the 'D4' suffix in MAX6381XR26D4-T and how does it affect reset timing?
The 'D4' suffix in MAX6381XR26D4-T specifies a minimum VCC reset timeout period of 1120ms, per the Reset Timeout Delay table in the datasheet. This value is guaranteed under all operating conditions (VCC = 1.0V to 5.5V, TA = -40°C to +125°C). The timeout begins when VCC rises above the 2.63V threshold and ensures the RESET signal remains asserted for ≥1120ms - critical for systems requiring extended stabilization time after power recovery, such as those with slow-ramping regulators or large capacitive loads.
Can the MAX6381XR26D4-T operate reliably at VCC = 1.2V, and what happens to the reset output below its specified range?
Yes, the MAX6381XR26D4-T guarantees correct reset output logic state down to VCC = 1.0V, as explicitly stated in the Absolute Maximum Ratings and Detailed Description sections. At VCC = 1.2V, the device remains fully functional: the internal comparator continues monitoring, the timeout timer operates, and the open-drain RESET output asserts correctly when VCC falls below 2.63V. Below 1.0V, operation is not characterized - the reset output may become indeterminate, so system design must ensure VCC never drops below 1.0V during supervised operation.
Is the MAX6381XR26D4-T pin-compatible with legacy Maxim reset ICs like the MAX809 series?
Yes, the MAX6381XR26D4-T is pin-compatible with MAX809/MAX810/MAX803 and related families in the 3-pin SC70 package, as confirmed in the Features section ("Pin Compatible with MAX809/MAX810/…"). Pin 1 is RESET (open-drain), Pin 2 is VCC, and Pin 3 is GND - matching the physical layout and electrical interface of those predecessors. However, note that MAX809 variants typically use push-pull outputs and different thresholds; electrical compatibility requires verifying reset polarity and timing requirements in the target application.
MAX6381XR26D4-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:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 1.12s Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX6381XR26D4-T FAQ
1.How can I place an order for MAX6381XR26D4-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR26D4-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 MAX6381XR26D4-T reliable?
The price and inventory of MAX6381XR26D4-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR26D4-T is usually 5 days.
3.What payment methods are accepted for MAX6381XR26D4-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381XR26D4-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381XR26D4-T?
MAX6381XR26D4-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR26D4-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 MAX6381XR26D4-T?
For technical support, including MAX6381XR26D4-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR26D4-T requirements.
6.How does Aetrix verify that MAX6381XR26D4-T is sourced from the original manufacturer or authorized distributors?
All MAX6381XR26D4-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 MAX6381XR26D4-T meets industry standards.
7.What is the process for return or replacement of MAX6381XR26D4-T?
All MAX6381XR26D4-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR26D4-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 MAX6381XR26D4-T part is unused and in its original packaging.
Return procedure for MAX6381XR26D4-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6381XR26D4-T Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
