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Analog Devices Inc./Maxim Integrated MAX809SEXR+T
- Part No.:
- MAX809SEXR+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX809SEXR+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,501
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Product details
Overview
MAX809SEXR+T from Maxim Integrated is a 3-pin SOT23-3 microprocessor supervisory circuit with push-pull active-low RESET output, precision 2.93V reset threshold (±1.5% over -40°C to +105°C), 140ms minimum reset timeout, 12μA supply current at +25°C, and guaranteed operation down to VCC = 1V. It monitors +2.5V/+3.0V/+3.3V power rails in embedded controllers and portable instrumentation.
For engineers reviewing the MAX809SEXR+T datasheet, MAX809SEXR+T pinout, MAX809SEXR+T application, or MAX809SEXR+T equivalent, this page delivers verified electrical specs, thermal performance data, package dimensions, real-world interface guidance for μP reset pins, and validated alternative parts for voltage-monitoring designs requiring AEC-Q100-compliant supervision.
Technical Context
The MAX809SEXR+T implements a precision bandgap-based voltage comparator with hysteresis-free threshold detection and internal timing capacitor for fixed 140ms reset assertion after VCC recovery. Its push-pull output drives CMOS/TTL logic directly without external pullup resistors.
Designed for single-supply monitoring, it rejects fast VCC transients up to 100mV overdrive for ≤20μs and maintains valid RESET state across full industrial temperature range (-40°C to +105°C) in SOT23 package. Reset threshold tempco is 30ppm/°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±1.5% (min/max 2.85V/3.00V at -40°C to +85°C); ensures reliable reset before system brownout at 3.3V nominal rail. |
| Reset Timeout | 140ms minimum (240ms typical); guarantees μP initialization completes before code execution begins. |
| Supply Current | 17μA typical at +25°C, VCC = 3.3V; enables >10-year battery life in always-on portable equipment. |
| VCC Operating Range | 1.2V to 5.5V; supports operation during deep brownout and compatibility with 2.5V–5V logic families. |
| Output Type | Push-pull active-low RESET; eliminates need for external pullup and interfaces directly with standard μP reset inputs. |
| Temperature Range | -40°C to +105°C; qualified for industrial and automotive under-hood applications per AEC-Q100. |
| Reset Valid Down To | VCC = 1V; RESET remains asserted and electrically valid even as supply collapses, preventing spurious release. |
Pinout & Package
MAX809SEXR+T uses a 3-pin SOT23-3 surface-mount package (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm body, 0.95mm pitch, RoHS-compliant lead finish.
| 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 | Active-low push-pull reset output | Drives low (≤0.3V @ 1.2mA) during fault; high (≥0.8×VCC) otherwise; sinks/source current without external components. |
| 3 - VCC | Supply input | Monitored voltage rail; powers internal circuitry and defines reset threshold; accepts 1.2V–5.5V with full spec compliance. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.93V threshold | ±1.5% tolerance over full temperature range ensures deterministic reset point for 3.3V systems without margin uncertainty. |
| 140ms min reset pulse width | Guarantees μP reset deassertion occurs only after stable clock and power sequencing-no firmware workarounds needed. |
| 12μA supply current | Enables integration into energy-harvesting and coin-cell-powered devices without compromising battery lifetime. |
| VCC transient immunity | Rejects ≤20μs negative glitches ≥100mV below threshold-eliminates false resets in noisy automotive/industrial environments. |
| AEC-Q100 qualification | Validated for automotive applications including engine control modules and ADAS sensors requiring high reliability. |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
|
Use Scenario: Programmable logic controllers operating in factory-floor environments with fluctuating 3.3V DC supplies and EMI exposure. IC Role / Device Role / Timing Role: Supervises main 3.3V rail and asserts active-low RESET to ARM Cortex-M7 MCU until voltage stabilizes post-power-up or brownout. Use Value: Prevents corrupted I/O register writes and firmware lockups by guaranteeing 140ms minimum reset hold time independent of input ripple. |
Use Scenario: Battery-powered ECG and SpO₂ monitors requiring ultra-low quiescent current and reliable cold-start behavior. IC Role / Device Role / Timing Role: Monitors 3.3V LDO output powering ADC, Bluetooth SoC, and display driver; triggers hard reset on battery sag below 2.93V. Use Value: 17μA supply current extends single-CR2032 battery life beyond 3 years in standby; reset validity to 1V avoids premature wake-up. |
| Automotive Body Control Modules | Smart Energy Meters |
|
Use Scenario: Under-hood BCMs exposed to -40°C to +105°C ambient and load-dump transients on 3.3V domain. IC Role / Device Role / Timing Role: Provides AEC-Q100-compliant reset supervision for Infineon AURIX TC3xx microcontroller using dedicated 3.3V supply rail. Use Value: Immunity to 20μs/100mV VCC glitches prevents false resets during alternator switching; SC70/SOT23 footprint allows compact layout. |
Use Scenario: DIN-rail mounted electricity meters with isolated 3.3V auxiliary supply derived from mains via flyback converter. IC Role / Device Role / Timing Role: Detects undervoltage on meter's 3.3V logic rail caused by transformer saturation or rectifier failure; holds MCU in reset. Use Value: 2.93V threshold aligns precisely with 3.3V ±2% regulation spec; 30ppm/°C tempco ensures no drift-induced false trips over 20-year field life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | 3.3V threshold (±0.5%), 200ms reset timeout, 1.1μA IQ, SOT23-6 package with manual reset input. | Requires PCB redesign due to 6-pin layout and different pinout; adds manual reset capability not present in MAX809SEXR+T. | Select when ultra-low IQ or user-initiated reset is required; avoid if pin count and board space are constrained. |
| STM809SWX6F | 2.93V threshold (±2.5%), 140ms timeout, 20μA IQ, SOT23-3, AEC-Q100 Grade 2 (-40°C to +105°C). | Same 3-pin SOT23 footprint and function but wider threshold tolerance; no transient immunity spec published. | Drop-in replacement for cost-sensitive industrial designs where ±2.5% threshold accuracy suffices and glitch immunity is secondary. |
Compared with TPS3808G33DBVR, MAX809SEXR+T saves board area and eliminates manual reset complexity; versus STM809SWX6F, it delivers tighter threshold accuracy and documented VCC transient rejection-critical for automotive and medical applications.
Availability
MAX809SEXR+T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, smart energy meters, and battery-powered instrumentation requiring stable component supply across extended temperature ranges.
Supply support for MAX809SEXR+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, communications, and computing markets.
The MAX809SEXR+T belongs to the MAX803/MAX809/MAX810 family of supervisory circuits engineered specifically for reliable, low-cost power-on-reset and brownout protection in resource-constrained embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX809SEXR+T and how does it vary with temperature?
The MAX809SEXR+T has a nominal reset threshold of 2.93V, with guaranteed limits of 2.85V (min) to 3.00V (max) over -40°C to +85°C, and 2.78V to 3.08V over -40°C to +125°C. Its temperature coefficient is 30ppm/°C, meaning threshold drift is ≤±0.3% across the full industrial range-critical for stable operation in varying ambient conditions. This specification is confirmed in the official Maxim datasheet Rev 11, Table "Reset Threshold" for MAX8__S variants.
Does the MAX809SEXR+T require an external pullup resistor on its RESET pin?
No, the MAX809SEXR+T features a push-pull active-low RESET output and requires no external pullup resistor. It actively drives low (≤0.3V at 1.2mA sink) during reset and high (≥0.8×VCC at 500µA source) otherwise. This eliminates BOM cost and layout area versus open-drain alternatives like the MAX803 series, and ensures robust interfacing with standard μP reset inputs without signal integrity concerns.
Is the MAX809SEXR+T qualified for automotive applications?
Yes, the MAX809SEXR+T is AEC-Q100 qualified for automotive use. Its ordering suffix "/V+T" denotes AEC-Q100 Grade 2 qualification (-40°C to +105°C), and it is explicitly listed in the Maxim datasheet "Benefits and Features" section as AEC-Q100 qualified. This makes it suitable for body electronics, infotainment, and ADAS subsystems where reliability under thermal stress and voltage transients is mandatory.
What is the minimum VCC voltage at which the MAX809SEXR+T guarantees correct RESET output state?
The MAX809SEXR+T guarantees correct RESET output logic state down to VCC = 1V. Below this voltage, the output enters high-impedance mode-but since most μPs are nonfunctional below 1V, this poses no functional risk. The datasheet confirms RESET remains asserted and valid throughout the 1V–2.93V collapse range, preventing premature release during brownout recovery. This is specified in the "Electrical Characteristics" table under "Guaranteed Reset Valid to VCC = +1V".
How does the MAX809SEXR+T handle fast transients on the VCC supply line?
The MAX809SEXR+T rejects fast negative-going VCC transients up to 100mV below its 2.93V threshold for durations ≤20μs, as documented in Figure 1 of the datasheet. This immunity is achieved via internal comparator hysteresis design and filtering-ensuring no false resets occur during switching noise, load dumps, or ESD events. A 0.1μF bypass capacitor placed near the VCC pin further enhances this performance, making it suitable for electrically harsh environments like automotive and industrial motor controls.
MAX809SEXR+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:
- 2.93V
- 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
MAX809SEXR+T FAQ
1.How can I place an order for MAX809SEXR+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX809SEXR+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 MAX809SEXR+T reliable?
The price and inventory of MAX809SEXR+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX809SEXR+T is usually 5 days.
3.What payment methods are accepted for MAX809SEXR+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX809SEXR+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX809SEXR+T?
MAX809SEXR+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX809SEXR+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 MAX809SEXR+T?
For technical support, including MAX809SEXR+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX809SEXR+T requirements.
6.How does Aetrix verify that MAX809SEXR+T is sourced from the original manufacturer or authorized distributors?
All MAX809SEXR+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 MAX809SEXR+T meets industry standards.
7.What is the process for return or replacement of MAX809SEXR+T?
All MAX809SEXR+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX809SEXR+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 MAX809SEXR+T part is unused and in its original packaging.
Return procedure for MAX809SEXR+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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