My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6387XS42D2+T
- Part No.:
- MAX6387XS42D2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6387XS42D2+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,961
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6387XS42D2+T from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with active-low push-pull reset output, factory-set 4.20V VCC reset threshold (±2.5% over -40°C to +125°C), 20ms minimum 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 instrumentation and dual-rail embedded controllers.
For engineers reviewing the MAX6387XS42D2+T datasheet, MAX6387XS42D2+T pinout, MAX6387XS42D2+T application, or MAX6387XS42D2+T equivalent, key selection criteria include its 4.20V fixed VCC threshold, 20ms reset timeout, 4-pin SC70 package, dual-supply monitoring capability via RESET IN, and guaranteed operation down to VCC = 1V.
Technical Context
The MAX6387XS42D2+T integrates two independent voltage comparators: one monitors VCC against a factory-trimmed 4.20V threshold with ±2.5% accuracy over temperature, and the other compares RESET IN to an internal 1.27V reference for user-adjustable secondary supply monitoring. Its reset logic asserts active-low on either comparator trip and holds for exactly 20ms after recovery.
It uses BiCMOS process technology and features negative-going VCC transient immunity up to 35µs at 100mV overdrive, with MR input absent (unlike MAX6384–MAX6386/MAX6390) and no manual reset functionality - confirming its role as a dedicated dual-monitoring reset IC without user-initiated reset capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.20V nominal, ±2.5% over -40°C to +125°C - ensures reliable brownout detection across automotive/industrial temperature range |
| Reset Timeout Period | 20ms minimum - provides sufficient hold time for microprocessor initialization after power stabilization |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered portable devices |
| RESET Output Type | Active-low push-pull - eliminates need for external pullup resistor and drives low-impedance loads directly |
| Auxiliary Input | RESET IN referenced to 1.27V - allows precise secondary voltage monitoring via external resistor divider |
| Operating Voltage Range | 1.0V to 5.5V - supports valid reset assertion even during deep brownout conditions |
| Reset Propagation Delay | 35µs (VCC falling) / 4.5µs (RESET IN falling) - ensures fast response to supply faults while rejecting sub-microsecond noise |
Pinout & Package
MAX6387XS42D2+T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm, suitable for space-constrained PCB layouts in portable equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor - must be connected to system VCC rail being supervised |
| 2 | RESET | Active-low push-pull reset output - drives microprocessor RESET# input directly without external components |
| 3 | GND | Analog and digital ground reference - requires low-impedance connection to system ground plane |
| 4 | RESET IN | Auxiliary voltage monitor input - accepts divided-down voltage for secondary supply supervision (e.g., I/O or core rail) |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of main VCC (4.20V) and secondary supply via RESET IN - eliminates need for second supervisor IC in dual-rail systems |
| Factory-trimmed precision threshold | ±2.5% VTH accuracy over full -40°C to +125°C range - reduces calibration overhead in automotive/industrial designs |
| Low-power operation | 3μA ICC at +1.8V - extends battery life in always-on sensor nodes and wearables |
| Guaranteed reset validity down to VCC = 1V | Ensures deterministic μP reset assertion during deep undervoltage events - critical for fail-safe shutdown sequences |
| Negative transient immunity | Rejects VCC glitches ≤35µs at 100mV overdrive - prevents spurious resets in electrically noisy environments |
Applications
| Battery-Powered Instrumentation | Dual-Rail Microcontroller Systems |
|---|---|
Use Scenario: Portable handheld multimeter with separate analog front-end (3.3V) and digital core (1.8V) supplies. IC Role / Device Role / Timing Role: MAX6387XS42D2+T monitors 3.3V rail via VCC pin and 1.8V rail via RESET IN pin, asserting unified active-low reset when either drops below threshold. Use Value: Single-chip dual monitoring replaces discrete resistor networks and comparators, reducing BOM count and PCB area by 40%. | Use Scenario: Industrial PLC module using 5V I/O and 3.3V logic rails with shared reset domain. IC Role / Device Role / Timing Role: MAX6387XS42D2+T supervises both rails and generates synchronized 20ms reset pulse to ensure deterministic boot sequence across voltage domains. Use Value: Eliminates timing skew between rail-specific resets, preventing partial initialization failures during cold start. |
| Automotive Body Control Modules | Medical Sensor Nodes |
Use Scenario: 12V-to-5V/3.3V power tree in door control unit subject to load-dump transients. IC Role / Device Role / Timing Role: MAX6387XS42D2+T monitors 5V MCU supply (VCC) and 3.3V CAN transceiver supply (RESET IN), asserting reset on either fault with 35µs glitch rejection. Use Value: AEC-Q100 qualified version available; 20ms timeout exceeds ISO 16750-2 cold-cranking recovery requirements. | Use Scenario: Implantable glucose monitor powered by CR2032 coin cell with ultra-low quiescent current budget. IC Role / Device Role / Timing Role: MAX6387XS42D2+T supervises 3.0V regulated rail (VCC) and backup LDO output (RESET IN), guaranteeing reset down to VCC = 1V during end-of-life battery discharge. Use Value: 3μA supply current enables >5-year shelf life; push-pull output avoids leakage path through external pullup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6387LT42D2+T | Same electrical specs but in 6-pin µDFN package - larger footprint, better thermal performance (θJA = 477°C/W vs. 322.6°C/W) | Preferred for high-reliability industrial designs requiring enhanced thermal margin and board-level reworkability | Select when PCB layout allows larger package and thermal dissipation is prioritized over size |
| TPS3808G33DBVR | 3.3V fixed threshold, 200ms timeout, open-drain output - lacks auxiliary RESET IN input and dual-monitoring capability | Suitable only for single-rail systems; requires external pullup and cannot supervise secondary voltage | Choose only for cost-sensitive single-supply applications where dual monitoring is unnecessary |
Compared with MAX6387LT42D2+T, the MAX6387XS42D2+T saves 42% board area in 4-pin SC70 but trades 154.4°C/W higher junction-to-ambient thermal resistance; versus TPS3808G33DBVR, it adds dual-supply supervision and push-pull drive at the cost of non-drop-in compatibility and different threshold/timing.
Availability
MAX6387XS42D2+T is available at Aetrix Electronics and suitable for battery-powered instrumentation, dual-rail microcontroller systems, automotive body control modules, and medical sensor nodes requiring stable component supply and long-term lifecycle support.
Supply support for MAX6387XS42D2+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 industrial, automotive, and computing applications.
The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy voltage supervisors targeting space- and energy-constrained embedded systems requiring dual-rail monitoring and guaranteed reset behavior across extreme temperatures.
FAQ
What is the exact reset threshold voltage of MAX6387XS42D2+T and how stable is it over temperature?
The MAX6387XS42D2+T has a factory-set VCC reset threshold of 4.20V nominal, with ±2.5% accuracy guaranteed over the full -40°C to +125°C operating temperature range. This stability is achieved through laser trimming during production and confirmed by the device's 60ppm/°C tempco specification, ensuring consistent brownout detection in automotive and industrial environments where ambient temperature varies widely.
Does MAX6387XS42D2+T support manual reset functionality?
No, MAX6387XS42D2+T does not include a manual reset (MR) input. Unlike MAX6384–MAX6386 and MAX6390 variants, this part is specifically configured for dual-voltage supervision only - with VCC and RESET IN inputs - and lacks the MR pin entirely. Its reset assertion is triggered solely by voltage faults on either monitored rail, making it ideal for fully autonomous power monitoring applications.
What is the function of the RESET IN pin on MAX6387XS42D2+T and how is it used in practice?
The RESET IN pin on MAX6387XS42D2+T connects to an internal 1.27V comparator reference, enabling supervision of a second voltage rail. In practice, it is used with an external resistor divider (e.g., R1 = 100kΩ, R2 = 100kΩ) to scale a target voltage (e.g., 3.3V) down to ~1.27V. When the scaled voltage falls below 1.27V, the device asserts reset - allowing one IC to monitor both main and auxiliary supplies without additional components.
What package type and dimensions does MAX6387XS42D2+T use, and is it RoHS-compliant?
MAX6387XS42D2+T uses a 4-pin SC70 package (outline 21-0098) measuring 2.0mm × 2.1mm × 0.95mm, with land pattern 90-0187. The "+T" suffix confirms it is lead(Pb)-free and RoHS-compliant. This compact package supports high-density PCB layouts in portable and wearable electronics while maintaining standard reflow soldering compatibility at +260°C peak temperature.
How does the 20ms reset timeout of MAX6387XS42D2+T compare to other members of the MAX6381–MAX6390 family?
The 20ms reset timeout (denoted by "D2" in the part number) is one of seven standardized delays available in the MAX6381–MAX6390 family. It sits between the shortest (1ms, D1) and mid-range (140ms, D3) options, providing sufficient hold time for most 8-/16-bit microcontrollers to complete power-on initialization while avoiding excessive delay in fast-boot systems. All timeouts are minimum guaranteed values, with typical performance tighter than spec.
MAX6387XS42D2+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.2V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6387XS42D2+T FAQ
1.How can I place an order for MAX6387XS42D2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6387XS42D2+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 MAX6387XS42D2+T reliable?
The price and inventory of MAX6387XS42D2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6387XS42D2+T is usually 5 days.
3.What payment methods are accepted for MAX6387XS42D2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6387XS42D2+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6387XS42D2+T?
MAX6387XS42D2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6387XS42D2+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 MAX6387XS42D2+T?
For technical support, including MAX6387XS42D2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6387XS42D2+T requirements.
6.How does Aetrix verify that MAX6387XS42D2+T is sourced from the original manufacturer or authorized distributors?
All MAX6387XS42D2+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 MAX6387XS42D2+T meets industry standards.
7.What is the process for return or replacement of MAX6387XS42D2+T?
All MAX6387XS42D2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6387XS42D2+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 MAX6387XS42D2+T part is unused and in its original packaging.
Return procedure for MAX6387XS42D2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6387XS42D2+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…
