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Analog Devices Inc./Maxim Integrated MAX6387XS25D3-T
- Part No.:
- MAX6387XS25D3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6387XS25D3-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
MAX6387XS25D3-T from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with active-low push-pull reset output, factory-set 2.50V VCC reset threshold (±2.5% over -40°C to +125°C), 140ms minimum VCC reset timeout, and auxiliary RESET IN input for monitoring a second voltage source. It consumes only 3μA at +1.8V and guarantees valid reset state down to VCC = 1V, used in battery-powered dual-rail systems requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6387XS25D3-T datasheet, MAX6387XS25D3-T pinout, MAX6387XS25D3-T application, or MAX6387XS25D3-T equivalent, key selection criteria include its 2.50V fixed VCC threshold, 140ms reset timeout, 4-pin SC70 package, auxiliary voltage monitoring capability, and guaranteed operation down to 1V supply - critical for low-power embedded and portable designs.
Technical Context
The MAX6387XS25D3-T integrates two independent reset comparators: one monitors VCC against a precision 2.50V internal reference (±2.5% over temperature), while the second compares an external voltage applied to RESET IN against a stable +1.27V internal reference. Reset asserts when either monitored voltage falls below its respective threshold.
An internal timer enforces a guaranteed minimum 140ms reset assertion period after VCC recovers above 2.50V or after RESET IN recovers above 1.27V. The active-low push-pull RESET output drives high-impedance loads directly without external pullup, and remains functional down to VCC = 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.50V ±2.5% over -40°C to +125°C - ensures accurate brownout detection across automotive/industrial temperature range |
| RESET Timeout Period | 140ms (min) - provides sufficient hold time for microprocessor initialization and peripheral stabilization |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors and wearables |
| RESET IN Threshold | +1.27V (±2.5% over temp) - allows precise secondary voltage monitoring via external resistor divider |
| Operating Voltage Range | 1.0V to 5.5V - supports valid reset signaling even during deep brownout or ultra-low-VCC wake-up sequences |
| Reset Output Type | Active-low push-pull - eliminates need for external pullup resistor and simplifies PCB layout |
| Package | 4-pin SC70 (X4+1 outline) - 1.3mm × 1.6mm footprint ideal for space-constrained portable designs |
Pinout & Package
MAX6387XS25D3-T is housed in a RoHS-compliant 4-pin SC70 package (outline number 21-0098, land pattern 90-0187), measuring 1.3mm × 1.6mm × 0.95mm with gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor rail - powers internal circuitry and feeds VCC reset comparator |
| 2 | RESET | Active-low push-pull reset output - drives low during fault; returns high after timeout without external components |
| 3 | GND | Ground reference for all internal comparators, timers, and output stage - must be low-impedance connection |
| 4 | RESET IN | Auxiliary voltage monitor input - high-impedance node compared to +1.27V reference; enables dual-rail supervision |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset comparators | Simultaneously monitors VCC (2.50V threshold) and external voltage (via RESET IN referenced to +1.27V), enabling true dual-supply supervision in single IC |
| Guaranteed reset validity down to VCC = 1V | Ensures deterministic μP reset state even during severe brownout or ultra-low-power wake-up - no external pulldown required |
| Factory-trimmed reset thresholds | 2.50V VCC threshold with ±2.5% accuracy over full -40°C to +125°C range - eliminates calibration overhead in production |
| Negative-going VCC transient immunity | Rejects short-duration supply glitches (e.g., <1µs at 100mV overdrive) - prevents spurious resets in noisy environments |
| Low quiescent current | 3μA at +1.8V - extends battery life in always-on sensor nodes and backup power circuits |
Applications
| Battery-Powered Dual-Rail Systems | Industrial Microcontroller Supervision |
|---|---|
Use Scenario: Portable medical device with separate 3.3V I/O and 1.8V core rails, where loss of either supply must trigger immediate processor reset. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting active-low RESET within 35µs of VCC or RESET IN falling below threshold, holding for 140ms minimum. Use Value: Prevents corrupted firmware execution during partial power failure - validated across -40°C to +85°C operating range. | Use Scenario: PLC controller board requiring robust power-on reset and brownout detection under fluctuating 24V DC input converted to 5V/3.3V rails. IC Role / Device Role / Timing Role: Primary VCC monitor (2.50V threshold) plus secondary rail monitor (via RESET IN), driving push-pull RESET to microcontroller's nRST pin. Use Value: Eliminates need for discrete comparators and RC timers - reduces BOM count and improves timing consistency vs. discrete solutions. |
| Automotive Body Control Modules | IoT Edge Sensor Nodes |
Use Scenario: BCM subassembly powered by vehicle battery (9V–16V) with LDOs generating 5V and 3.3V supplies; requires AEC-Q100–compliant supervision. IC Role / Device Role / Timing Role: Monitors 3.3V rail (VCC) and 5V rail (via RESET IN divider), asserting RESET on either fault with 140ms timeout. Use Value: Meets automotive reset timing requirements while occupying minimal PCB area - 4-pin SC70 avoids routing congestion near ECU processors. | Use Scenario: Wireless environmental sensor node powered by CR2032 coin cell, using 1.8V MCU and 3.0V RF transceiver - both rails require coordinated reset. IC Role / Device Role / Timing Role: Supervises 1.8V VCC and 3.0V transceiver rail (via RESET IN), consuming only 3μA to maximize battery lifetime. Use Value: Enables >5-year shelf life and field operation - ultra-low ICC combined with guaranteed 1V operation preserves reset integrity during end-of-life voltage sag. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6387LT25D3-T | Same electrical specs but in 6-pin μDFN (L611+1) instead of 4-pin SC70 - larger footprint, better thermal performance (θJA = 477°C/W vs. 322.6°C/W) | Suitable for thermally demanding industrial boards where SC70 self-heating may affect long-term stability | Select when PCB layout allows larger package and thermal margin is prioritized over size |
| TPS3808G33DBVR | 2.93V fixed threshold (not 2.50V), 200ms timeout, open-drain output - requires external pullup; 1.8V–6.0V VCC range | Compatible for 3.3V-only systems needing longer timeout; not suitable for dual-rail monitoring (no RESET IN pin) | Choose only if 2.50V threshold and auxiliary input are not required - verify compatibility with existing reset timing budget |
Compared with MAX6387XS25D3-T, the LT25D3-T offers identical functionality in a thermally superior but larger package, while the TPS3808G33DBVR lacks dual-monitoring capability and requires external biasing - making MAX6387XS25D3-T uniquely suited for compact dual-voltage supervision.
Availability
MAX6387XS25D3-T is available at Aetrix Electronics and suitable for battery-powered equipment, industrial controllers, and automotive body electronics requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6387XS25D3-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 industrial, automotive, and computing applications, emphasizing low power, high reliability, and small form factors.
The MAX6381–MAX6390 family delivers single/dual low-voltage μP reset circuits optimized for space-constrained, battery-sensitive systems requiring guaranteed reset behavior across extreme temperatures.
FAQ
What is the exact reset threshold voltage for MAX6387XS25D3-T and how accurate is it over temperature?
The MAX6387XS25D3-T has a factory-set VCC reset threshold of 2.50V, specified with ±2.5% accuracy over the full operating temperature range of -40°C to +125°C. This tolerance is guaranteed by design and applies to all units - no unit-to-unit calibration is needed. The RESET IN comparator uses a separate +1.27V internal reference, also accurate to ±2.5% over temperature.
Does MAX6387XS25D3-T support monitoring two different supply voltages simultaneously?
Yes, MAX6387XS25D3-T supports dual-voltage supervision: VCC is monitored against its 2.50V internal threshold, while the RESET IN pin monitors a second voltage against a +1.27V internal reference. When either voltage drops below its respective threshold, the active-low RESET output asserts and remains asserted for the full 140ms timeout period.
What is the function of the RESET IN pin on MAX6387XS25D3-T and how is it configured?
The RESET IN pin on MAX6387XS25D3-T is a high-impedance input to a dedicated comparator referenced to +1.27V. To monitor a second supply (e.g., 3.3V or 5V), connect it through a resistor divider so that the voltage at RESET IN equals 1.27V when the target supply reaches its desired trip point. The MAX6387XS25D3-T datasheet provides the exact formula: R1 = R2 × [(VINTH/1.27V) − 1].
Can MAX6387XS25D3-T operate reliably when VCC drops below 1.8V?
Yes, MAX6387XS25D3-T guarantees correct RESET output logic state down to VCC = 1.0V - well below typical 1.8V logic rails. Its 3μA supply current at 1.8V and stable operation at 1.0V make it suitable for brownout recovery and ultra-low-power wake-up sequences where other supervisors fail.
What package type and dimensions does MAX6387XS25D3-T use, and is it RoHS-compliant?
MAX6387XS25D3-T uses a 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 1.3mm × 1.6mm × 0.95mm. The "+T" suffix confirms it is lead(Pb)-free and RoHS-compliant. This compact gull-wing package enables high-density layouts in portable and wearable electronics without requiring reflow profile adjustments.
MAX6387XS25D3-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.5V, Adj
- 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-70-4
MAX6387XS25D3-T FAQ
1.How can I place an order for MAX6387XS25D3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6387XS25D3-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 MAX6387XS25D3-T reliable?
The price and inventory of MAX6387XS25D3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6387XS25D3-T is usually 5 days.
3.What payment methods are accepted for MAX6387XS25D3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6387XS25D3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6387XS25D3-T?
MAX6387XS25D3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6387XS25D3-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 MAX6387XS25D3-T?
For technical support, including MAX6387XS25D3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6387XS25D3-T requirements.
6.How does Aetrix verify that MAX6387XS25D3-T is sourced from the original manufacturer or authorized distributors?
All MAX6387XS25D3-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 MAX6387XS25D3-T meets industry standards.
7.What is the process for return or replacement of MAX6387XS25D3-T?
All MAX6387XS25D3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6387XS25D3-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 MAX6387XS25D3-T part is unused and in its original packaging.
Return procedure for MAX6387XS25D3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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