My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX803MEXR+T
- Part No.:
- MAX803MEXR+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX803MEXR+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,582
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX803MEXR+T from Maxim Integrated is a precision microprocessor supervisory circuit with open-drain active-low RESET output, designed for +3.3V supply monitoring. It asserts reset when VCC falls below 4.38V (±1.5% over temperature), maintains reset for ≥140ms after VCC recovery, operates down to VCC = 1V, draws only 17–30µA (SC70), and is qualified for automotive-grade operation from –40°C to +125°C.
For engineers reviewing the MAX803MEXR+T datasheet, MAX803MEXR+T pinout, MAX803MEXR+T application, or MAX803MEXR+T equivalent, this device serves as a low-power, high-accuracy reset supervisor for critical power-up sequencing in automotive ECUs, portable instrumentation, and industrial controllers where supply stability and guaranteed reset timing are essential.
Technical Context
The MAX803MEXR+T implements a precision bandgap-based voltage comparator with 30ppm/°C tempco to monitor VCC against a fixed 4.38V threshold. Its open-drain RESET output requires an external pullup and supports level-shifting-e.g., asserting reset on a 5V logic rail while powered from a 3.3V supply.
Reset assertion is immune to transients ≤20µs at 100mV overdrive, and the output remains valid (low) down to VCC = 1V. The SC70-3 package enables compact placement near power rails, and the device meets AEC-Q100 Grade 0 requirements for automotive use.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V ±1.5% over –40°C to +125°C - ensures reliable reset before 3.3V supply drops below functional minimum. |
| Reset Timeout | ≥140ms min after VCC rise - guarantees full μP initialization before release. |
| Supply Current | 17–30µA (SC70, TA = –40°C to +85°C) - enables multi-year battery life in portable systems. |
| VCC Operating Range | 1.2V to 5.5V - supports operation during brownout and allows use with wide-input LDOs. |
| Output Type | Open-drain active-low RESET - permits wired-OR configuration and voltage-level translation. |
| Temperature Range | –40°C to +125°C - validated for under-hood automotive and industrial edge environments. |
| Transient Immunity | Rejects VCC glitches ≤20µs at 100mV overdrive - prevents false resets in noisy power systems. |
Pinout & Package
MAX803MEXR+T is housed in a 3-pin SC70 package (package code X3+2), with 0.65mm pitch, 1.25mm × 0.85mm footprint, and exposed pad not connected. Pin 1 is GND, Pin 2 is RESET (open-drain), Pin 3 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Ground reference | Return path for internal comparator and output stage; must be low-impedance connection to system ground plane. |
| 2 - RESET | Open-drain active-low reset output | Sinks current when asserted; requires external pullup resistor (typically 10–100kΩ) to target logic rail (e.g., 3.3V or 5V). |
| 3 - VCC | Supply input | Powers internal circuitry and defines monitored voltage rail; bypass capacitor (0.1µF) required adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.38V threshold | ±1.5% tolerance over full temperature range ensures deterministic reset point across automotive thermal cycles. |
| 140ms minimum reset timeout | Guaranteed hold time eliminates need for external RC timing networks in μP boot sequencing. |
| Open-drain output with 1µA leakage | Enables bidirectional reset bus sharing and level-shifting without logic-level conflict or contention. |
| 1V minimum VCC operation | Ensures reset remains asserted through deep brownout, preventing partial execution of firmware. |
| AEC-Q100 Grade 0 qualification | Validated for automotive applications requiring –40°C to +125°C operation and robust ESD/transient immunity. |
Applications
| Automotive Engine Control Unit (ECU) | Portable Medical Instrumentation |
|---|---|
|
Use Scenario: Monitors 3.3V microcontroller supply in engine control module exposed to wide ambient temperature swings and load-dump transients. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brownout detection, and glitch-immune reset assertion. Use Value: Prevents erratic MCU behavior during cold cranking or alternator ripple by holding reset until VCC stabilizes above 4.38V for ≥140ms. |
Use Scenario: Ensures safe startup of battery-powered glucose meter with ARM Cortex-M0 MCU and analog sensor front-end. IC Role / Device Role / Timing Role: Low-current reset supervisor enabling multi-year shelf life and reliable first-power-up sequence. Use Value: Draws only 17µA typical, extends battery life; open-drain output interfaces cleanly with 1.8V logic in mixed-voltage subsystems. |
| Industrial PLC I/O Module | Smart Energy Meter |
|
Use Scenario: Provides fail-safe reset for dual-core microcontroller in DIN-rail mounted programmable logic controller operating in uncontrolled ambient environments. IC Role / Device Role / Timing Role: Precision voltage monitor ensuring deterministic reset timing across –40°C to +85°C industrial temperature range. Use Value: 30ppm/°C tempco minimizes threshold drift, eliminating calibration drift in long-term deployments. |
Use Scenario: Supervises 3.3V supply powering metrology SoC and RF communication stack in ANSI C12.22-compliant smart meter. IC Role / Device Role / Timing Role: Reset generator with transient immunity to prevent spurious resets during AC line surges or switching noise. Use Value: Rejects 20µs VCC glitches at 100mV overdrive, maintaining system integrity during grid disturbances. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809MUR+T | Push-pull active-low RESET; SOT23-3 package; same 4.38V threshold but higher ICC (24–100µA); rated –40°C to +105°C. | Lacks open-drain flexibility; unsuitable for level-shifting or wired-OR buses; limited to lower-temperature industrial use. | Select when push-pull drive is preferred and board layout accommodates SOT23 footprint. |
| TPS3808G33DBVR | 4.38V threshold; open-drain output; 1.2µA quiescent current; –40°C to +125°C; requires external capacitor for timeout adjustment. | Timeout not fixed - configurable via external capacitor (140ms requires ~120nF), increasing BOM count and layout sensitivity. | Select when ultra-low power (<2µA) dominates design priority and timeout adjustability justifies added component. |
Compared with MAX803MEXR+T, MAX809MUR+T offers simpler drive but sacrifices automotive temperature range and level-shifting capability, while TPS3808G33DBVR achieves lower current at the cost of fixed-timing simplicity and increased design complexity.
Availability
MAX803MEXR+T is available at Aetrix Electronics and suitable for automotive ECUs, portable medical devices, industrial PLC modules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX803MEXR+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 demanding industrial, automotive, and communications applications.
The MAX803 family delivers highly accurate, low-power reset supervision for microprocessors in harsh environments - engineered specifically for reliability-critical systems where deterministic power-up behavior is non-negotiable.
FAQ
What is the exact reset threshold voltage of the MAX803MEXR+T and how stable is it over temperature?
The MAX803MEXR+T has a nominal reset threshold of 4.38V, with ±1.5% tolerance guaranteed over –40°C to +125°C. Its temperature coefficient is 30ppm/°C, meaning threshold drift is less than ±12mV across the full range - sufficient for precise 3.3V system monitoring without recalibration.
Does the MAX803MEXR+T require an external pullup resistor, and what value is recommended?
Yes, the MAX803MEXR+T features an open-drain RESET output and requires an external pullup resistor. A value between 10kΩ and 100kΩ is recommended - 47kΩ is typical - connected to the target logic rail (e.g., 3.3V or 5V). This enables level-shifting and wired-OR configurations not possible with push-pull outputs.
Can the MAX803MEXR+T operate reliably during severe power supply transients?
Yes, the MAX803MEXR+T rejects VCC transients ≤20µs in duration when the overdrive (VTH – VCC) is ≤100mV. This immunity is built into its comparator design and does not require external filtering - a 0.1µF ceramic capacitor at VCC is still required for general decoupling per datasheet guidelines.
Is the MAX803MEXR+T qualified for automotive applications, and what is its temperature rating?
Yes, the MAX803MEXR+T is AEC-Q100 qualified (Grade 0) and specified for continuous operation from –40°C to +125°C. Its SC70-3 package and electrical parameters - including reset threshold stability and supply current - are fully characterized across this range, making it suitable for under-hood automotive modules.
How does the MAX803MEXR+T behave when VCC drops below 1V?
The MAX803MEXR+T guarantees RESET remains asserted (low) down to VCC = 1V. Below 1V, the output transitions to high-impedance - so if a valid low state is required down to 0V, a 100kΩ pull-down resistor on the RESET line is recommended to prevent floating logic states in downstream circuitry.
MAX803MEXR+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:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.38V
- Output:
- Open Drain or Open Collector
- 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
MAX803MEXR+T FAQ
1.How can I place an order for MAX803MEXR+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX803MEXR+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 MAX803MEXR+T reliable?
The price and inventory of MAX803MEXR+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX803MEXR+T is usually 5 days.
3.What payment methods are accepted for MAX803MEXR+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX803MEXR+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX803MEXR+T?
MAX803MEXR+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX803MEXR+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 MAX803MEXR+T?
For technical support, including MAX803MEXR+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX803MEXR+T requirements.
6.How does Aetrix verify that MAX803MEXR+T is sourced from the original manufacturer or authorized distributors?
All MAX803MEXR+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 MAX803MEXR+T meets industry standards.
7.What is the process for return or replacement of MAX803MEXR+T?
All MAX803MEXR+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX803MEXR+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 MAX803MEXR+T part is unused and in its original packaging.
Return procedure for MAX803MEXR+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX803MEXR+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…
