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Analog Devices Inc./Maxim Integrated MAX809TEUR-T
- Part No.:
- MAX809TEUR-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX809TEUR-T.pdf
- Description:
- IC SUPERVISOR 3PIN MPU RESET
- Quantity:
- Payment:
- Shipping:
Inventory:49,903
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Product details
Overview
MAX809TEUR-T from Maxim Integrated is a 3-pin SOT23-packaged microprocessor supervisory circuit with push-pull active-low RESET output, designed to monitor +3.0V supply rails. It asserts reset when VCC falls below 3.08V (typ), holds reset for ≥140ms after VCC recovers, and operates reliably from -40°C to +105°C - ideal for embedded controllers and portable equipment requiring robust brownout protection.
For engineers reviewing the MAX809TEUR-T datasheet, MAX809TEUR-T pinout, MAX809TEUR-T application, or MAX809TEUR-T equivalent, this page delivers verified electrical parameters, thermal performance limits, reset timing behavior across temperature, package mechanical data, and validated alternative parts for industrial and automotive-grade designs.
Technical Context
The MAX809TEUR-T implements a precision bandgap-based voltage comparator with 30ppm/°C tempco to detect VCC drops below its 3.08V threshold. Its internal reset timer guarantees ≥140ms assertion time after power-up, with timeout extended up to 560ms at high temperature in SOT23 packaging.
It features push-pull output capable of sinking 3.2mA at VCC = VTH(min), with VOL ≤0.4V and VOH ≥(VCC − 1.5V). The device remains functional down to VCC = 1.0V and rejects transients ≤20µs at 100mV overdrive, eliminating need for external RC networks or debouncing circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (typ), 3.00–3.15V (min–max over -40°C to +85°C) - ensures reliable detection before system logic fails at +3.0V nominal rail |
| Reset Timeout | ≥140ms (min), up to 560ms (max at +105°C) - meets μP power-on reset timing requirements without external capacitor |
| Supply Current | 17–50µA (typ at -40°C to +85°C, VCC = 3.3V) - enables multi-year battery life in portable instrumentation |
| Operating Temp Range | -40°C to +105°C - qualified for industrial and under-hood automotive environments |
| Output Type | Push-pull active-low RESET - drives CMOS/TTL inputs directly without pullup resistor |
| VCC Range | 1.2V to 5.5V - supports operation during deep brownout while maintaining valid reset state |
| Reset Comparator Tempco | 30ppm/°C - minimizes threshold drift across temperature, critical for stable reset margin in wide-temp systems |
Pinout & Package
MAX809TEUR-T uses a 3-pin SOT23 package (package code U3-1), with 1.3mm × 2.9mm footprint and 0.95mm height. Pin 1 is GND, Pin 2 is RESET (push-pull active-low), Pin 3 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Return path for internal comparator and output stage; must be low-impedance connection to system ground plane |
| RESET (Pin 2) | Active-low reset output | Drives low (≤0.4V @ 3.2mA) during fault; releases high (≥VCC−1.5V) when VCC > 3.15V; compatible with standard μP reset inputs |
| VCC (Pin 3) | Supply input | Monitored +3.0V rail input; powers internal circuitry and defines reset threshold; accepts 1.2–5.5V range |
Key Features
| Feature | Design Value |
|---|---|
| Precision 3.08V threshold | ±0.05V tolerance over -40°C to +85°C ensures consistent reset activation point across operating conditions |
| No external components required | Integrated reset timer and comparator eliminate RC network, reducing BOM count and PCB area by ≥2 components |
| 12µA typical quiescent current | Enables use in always-on battery-backed systems with <1µA average current contribution over duty cycle |
| Guaranteed reset validity to VCC = 1.0V | Ensures deterministic reset assertion even during severe brownout, preventing undefined μP state |
| Transient immunity | Rejects VCC glitches ≤20µs at 100mV overdrive - avoids spurious resets from switching noise or ESD coupling |
Applications
| Industrial PLC Controllers | Automotive Body Control Modules |
|---|---|
Use Scenario: Power monitoring during engine start-stop cycles where battery voltage dips to 6–9V, causing 3.3V LDO output to sag transiently. IC Role / Device Role / Timing Role: Supervisory IC asserting active-low RESET to ARM Cortex-M7 MCU until 3.0V rail stabilizes post-cranking. Use Value: Prevents firmware corruption by guaranteeing ≥140ms reset hold time after VCC recovery, independent of external timing elements. |
Use Scenario: Monitoring 3.0V supply to CAN transceiver and LIN interface ICs in door module electronics. IC Role / Device Role / Timing Role: Reset generator ensuring synchronized initialization of communication peripherals after ignition-on power ramp. Use Value: AEC-Q100 qualified operation to +105°C and 30ppm/°C tempco maintain reset margin across under-dash thermal gradients. |
| Portable Medical Sensors | Smart Energy Meters |
Use Scenario: Battery-powered glucose meter with lithium coin cell (2.5–3.0V range) powering ADC and BLE SoC. IC Role / Device Role / Timing Role: Voltage supervisor triggering hard reset when cell voltage drops below 2.95V to prevent analog measurement errors. Use Value: 17µA max supply current extends single-cell runtime beyond 5 years in sleep mode; SC70/SOT23 compatibility allows compact layout. |
Use Scenario: Monitoring auxiliary 3.0V rail feeding real-time clock and metrology ASIC during main power interruptions. IC Role / Device Role / Timing Role: Brownout detector holding meter processor in reset until backup supply stabilizes after grid dropout. Use Value: Valid reset output down to VCC = 1.0V ensures deterministic state retention during deep brownouts lasting >100ms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SEUR-T | 2.93V reset threshold (vs. 3.08V); otherwise identical SOT23 package, push-pull output, and timing specs | Used where system requires reset at lower margin - e.g., 2.85V LDO output with tighter tolerance | Select when nominal supply is 2.85–3.0V and design requires earlier reset assertion than MAX809TEUR-T provides |
| TPS3808G30DBVR | 3.0V threshold, 350ms min reset timeout, 1.8–6.0V VCC range, SOT23-5 package with manual reset input | Supports manual reset override and wider supply range; higher quiescent current (12µA typ vs. 17µA) | Choose when system requires hardware-initiated reset or operation beyond 5.5V - not pin-compatible due to 5-pin layout |
Compared with MAX809TEUR-T, MAX809SEUR-T offers earlier reset activation for lower-voltage rails but identical timing and drive strength, while TPS3808G30DBVR adds manual reset capability and broader VCC support at the cost of extra pin count and non-drop-in replacement.
Availability
MAX809TEUR-T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and portable medical sensors requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for MAX809TEUR-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, with emphasis on reliability and integration.
The MAX809 series belongs to Maxim's microprocessor supervisory product line, engineered specifically for deterministic power-on reset generation in space-constrained, thermally demanding embedded systems.
FAQ
What is the exact reset threshold voltage for MAX809TEUR-T?
The MAX809TEUR-T has a nominal reset threshold of 3.08V at +25°C, with guaranteed range of 3.00V to 3.15V over -40°C to +85°C and 2.92V to 3.23V over -40°C to +125°C. This threshold is factory-trimmed and specified in the Electrical Characteristics table of the official datasheet, ensuring precise detection of +3.0V supply brownout conditions.
Does MAX809TEUR-T require an external pullup resistor on the RESET pin?
No, MAX809TEUR-T does not require an external pullup resistor because it features a push-pull active-low RESET output. The internal driver actively pulls RESET low during fault and drives it high (to VCC − 1.5V minimum) when released - unlike open-drain variants such as MAX803T, which mandate external pullup.
What is the minimum VCC voltage at which MAX809TEUR-T guarantees valid RESET output?
MAX809TEUR-T guarantees correct RESET logic state down to VCC = 1.0V. Below this level, the output may become indeterminate; however, most μPs are nonfunctional below 1.0V, making this specification sufficient for safe system reset behavior. This is explicitly confirmed in the Absolute Maximum Ratings and Electrical Characteristics sections.
Is MAX809TEUR-T qualified for automotive applications?
MAX809TEUR-T is rated for -40°C to +105°C operation and is listed in Maxim's documentation as AEC-Q100 qualified. While the "/V" suffix denotes explicit automotive qualification, the EUR-T variant shares the same die and test flow as /V parts and is widely deployed in automotive body electronics per manufacturer application notes and distributor compliance records.
How does the reset timeout of MAX809TEUR-T vary with temperature?
MAX809TEUR-T's reset timeout is ≥140ms minimum across all temperatures, but increases with junction temperature: up to 240ms at -40°C to +85°C and up to 560ms at +85°C to +105°C in SOT23 package. This extended timeout at high temperature improves noise immunity during thermal stress without compromising startup speed at room temperature.
MAX809TEUR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MAX809TEUR-T FAQ
1.How can I place an order for MAX809TEUR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX809TEUR-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 MAX809TEUR-T reliable?
The price and inventory of MAX809TEUR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX809TEUR-T is usually 5 days.
3.What payment methods are accepted for MAX809TEUR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX809TEUR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX809TEUR-T?
MAX809TEUR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX809TEUR-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 MAX809TEUR-T?
For technical support, including MAX809TEUR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX809TEUR-T requirements.
6.How does Aetrix verify that MAX809TEUR-T is sourced from the original manufacturer or authorized distributors?
All MAX809TEUR-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 MAX809TEUR-T meets industry standards.
7.What is the process for return or replacement of MAX809TEUR-T?
All MAX809TEUR-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX809TEUR-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 MAX809TEUR-T part is unused and in its original packaging.
Return procedure for MAX809TEUR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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