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Analog Devices Inc./Maxim Integrated MAX809LEUR-T
- Part No.:
- MAX809LEUR-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX809LEUR-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,069
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Product details
Overview
MAX809LEUR-T from Maxim Integrated is a 3-pin SOT23-packaged microprocessor supervisory circuit with push-pull active-low RESET output, 4.63V reset threshold (±2.5% over temperature), 140ms minimum reset timeout, and guaranteed operation down to VCC = 1V. It monitors +5V power supplies in embedded controllers and portable systems to prevent erroneous code execution during power-up, brownout, or shutdown.
For engineers reviewing the MAX809LEUR-T datasheet, MAX809LEUR-T pinout, MAX809LEUR-T application, or MAX809LEUR-T equivalent, this device delivers precision voltage monitoring, transient-immune reset assertion, low 24µA supply current at -40°C to +85°C, and AEC-Q100-qualified variants for automotive use - all in a space-constrained 3-pin SOT23 footprint.
Technical Context
The MAX809LEUR-T implements a precision bandgap-based voltage comparator that asserts RESET when VCC falls below 4.63V, holding it active for ≥140ms after VCC recovers above threshold. Its push-pull output drives logic-low directly without external pullup, supporting direct interface to μP reset inputs.
Designed for robustness in noisy environments, the reset comparator rejects fast VCC transients (e.g., ≤20µs glitches at 100mV overdrive) and maintains valid output state across -40°C to +105°C. Supply current remains stable at 24–60µA over full temperature range, enabling battery-powered operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V ±2.5% over -40°C to +105°C - ensures reliable reset assertion before +5V supply drops to 4.5V, preventing marginal μP operation. |
| Reset Timeout | 140ms minimum (SOT23) - guarantees sufficient hold time for μP initialization, even under slow-rising VCC conditions. |
| Supply Current | 24µA (typ) at -40°C to +85°C - enables multi-year battery life in portable instrumentation and remote sensors. |
| VCC Operating Range | 1.2V to 5.5V - supports valid reset assertion down to 1.2V while maintaining functionality through full industrial voltage range. |
| Output Type | Push-pull active-low - eliminates need for external pullup resistor, reduces BOM count, and ensures fast, low-impedance RESET deassertion. |
| Reset Valid Down To | VCC = 1V - guarantees defined logic state on RESET pin during deep brownout, avoiding floating inputs on μP reset pins. |
| Transient Immunity | Rejects ≤20µs negative VCC transients at 100mV overdrive - prevents false resets from switching noise or ESD-induced supply dips. |
Pinout & Package
MAX809LEUR-T is housed in a RoHS-compliant 3-pin SOT23 package (package code U3+1), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads optimized for automated assembly and thermal performance up to +105°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Ground reference | Return path for internal comparator and output stage; must be connected to system ground plane for noise immunity and accurate threshold tracking. |
| 2 - RESET | Active-low push-pull reset output | Drives logic-low during reset condition; sinks ≥1.2mA at 0.3V; actively pulls high to VCC when deasserted - no external pullup required. |
| 3 - VCC | Supply input | Monitored power rail input; accepts 1.2V–5.5V; powers internal circuitry and defines reset threshold reference via precision bandgap. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.63V reset threshold | ±2.5% tolerance over -40°C to +105°C ensures deterministic reset point across automotive and industrial temperature ranges. |
| 140ms minimum reset pulse width | Guaranteed hold time meets Intel/ARM μP reset timing requirements without external timing components or RC networks. |
| 24µA typical supply current | Enables integration into always-on battery-backed systems (e.g., RTC supervisors, sensor nodes) with negligible quiescent drain. |
| VCC = 1V reset validity | Maintains defined logic state on RESET pin down to 1V supply, eliminating risk of floating reset inputs during deep undervoltage events. |
| Transient-immune comparator | Rejects sub-20µs supply glitches - critical for reliability in motor-control, automotive, and switch-mode power supply environments. |
Applications
| Industrial PLC Controllers | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Power sequencing and brownout protection in programmable logic controllers operating in factory-floor environments with fluctuating 24VDC-derived 5V rails. IC Role / Device Role / Timing Role: Supervises +5V microcontroller supply and asserts active-low RESET until stable, ensuring deterministic boot after line disturbances. Use Value: Prevents firmware corruption during 120Hz ripple or 50ms line sags by guaranteeing ≥140ms reset hold time and rejecting <20µs transients. |
Use Scenario: Reset management for infotainment SoCs and gateway MCUs in 12V automotive electrical systems subject to load-dump and cold-crank conditions. IC Role / Device Role / Timing Role: Monitors post-regulator 5V domain and holds RESET low during cranking-induced dips below 4.5V, resuming only after stable recovery. Use Value: Enables AEC-Q100-compliant system startup by asserting reset at precisely 4.63V with ±2.5% accuracy across -40°C to +105°C. |
| Portable Medical Sensors | Smart Energy Meters |
|
Use Scenario: Battery-powered glucose monitors and pulse oximeters requiring ultra-low-power supervision during intermittent wake/sleep cycles. IC Role / Device Role / Timing Role: Provides fail-safe reset during Li-ion battery discharge from 4.2V to 3.0V, with RESET asserted below 4.63V and held ≥140ms. Use Value: Extends operational lifetime via 24µA supply current while ensuring μP never executes invalid code due to marginal supply voltage. |
Use Scenario: Tamper-resistant electricity meters with dual-supply domains (mains-derived +5V and backup coin-cell +3V) needing independent reset control. IC Role / Device Role / Timing Role: Supervises primary +5V rail and asserts RESET to metering SoC during AC loss or surge events, with guaranteed validity down to VCC = 1V. Use Value: Eliminates need for external pullup or level-shifting, reducing component count and PCB area in tightly regulated Class 0.5 meter designs. |
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. 4.63V); otherwise identical pinout, package, and timing. | Targets +3.3V systems instead of +5V; unsuitable for 5V μP reset without redesign. | Select MAX809SEUR-T only when supervising 3.3V rails; verify compatibility with target μP's reset voltage tolerance. |
| TPS3808G15DBVR | 1.5V threshold, 200ms reset timeout, 1.8µA IQ, SOT23-6 package - different pin count and footprint. | Requires PCB layout change; suited for ultra-low-power 1.8V/3.3V systems where 24µA is excessive. | Choose TPS3808G15DBVR only if lower IQ or tighter 1.5V threshold is mandatory; not drop-in compatible. |
Compared with MAX809LEUR-T, MAX809SEUR-T offers identical form and function but targets 3.3V systems, while TPS3808G15DBVR provides lower IQ and different threshold at the cost of non-compatible packaging and longer timeout - making MAX809LEUR-T optimal for cost-sensitive, space-constrained +5V industrial and automotive reset applications.
Availability
MAX809LEUR-T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and portable medical sensors requiring stable component supply, long-term lifecycle support, and AEC-Q100-qualified reliability.
Supply support for MAX809LEUR-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) is a semiconductor company specializing in analog, mixed-signal, and power-management ICs for industrial, automotive, and communications applications.
The MAX809 series belongs to Maxim's microprocessor supervisory product line, engineered specifically for deterministic power-on/brownout reset generation in space- and power-constrained embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX809LEUR-T and how stable is it over temperature?
The MAX809LEUR-T has a nominal reset threshold of 4.63V, with guaranteed tolerance of ±2.5% over the full operating temperature range of -40°C to +105°C. This stability is achieved using a precision bandgap reference and trimmed comparator, ensuring the device asserts RESET before the +5V supply falls below 4.5V - critical for preventing marginal μP operation in industrial and automotive environments. The MAX809LEUR-T maintains this accuracy without external calibration.
Does the MAX809LEUR-T require an external pullup resistor on its RESET pin?
No, the MAX809LEUR-T does not require an external pullup resistor because it features a push-pull active-low RESET output. Unlike open-drain variants (e.g., MAX803), the MAX809LEUR-T actively drives both logic-low (sinking ≥1.2mA) and logic-high (pulling to VCC) states. This eliminates BOM components, simplifies layout, and ensures fast, low-impedance reset deassertion - a key advantage in noise-sensitive applications where the MAX809LEUR-T is deployed.
Can the MAX809LEUR-T operate reliably during fast power-supply transients?
Yes, the MAX809LEUR-T is designed to ignore fast negative-going VCC transients: it rejects pulses ≤20µs wide when the supply dips 100mV below the 4.63V threshold. This immunity is verified per Maxim's typical operating characteristics and ensures no false resets occur due to switching noise, ESD, or load-dump events - a documented behavior confirmed in the MAX809LEUR-T datasheet's Applications Information section.
What is the minimum VCC voltage at which the MAX809LEUR-T guarantees valid RESET output logic states?
The MAX809LEUR-T guarantees correct RESET logic states down to VCC = 1V. Below this voltage, the output may become undefined; however, at exactly 1V, the device still sinks ≥1.2mA in the low state and pulls high to VCC in the deasserted state. This specification ensures safe, predictable behavior during deep brownout conditions - a confirmed feature explicitly stated in the MAX809LEUR-T Electrical Characteristics table.
Is the MAX809LEUR-T qualified for automotive applications?
The MAX809LEUR-T itself is rated for -40°C to +105°C operation and is built on Maxim's automotive-capable process, but it is not individually AEC-Q100 qualified. However, the /V+ suffix variants (e.g., MAX809LEXR/V+T) are fully AEC-Q100 qualified. For automotive use, engineers should select those qualified versions - the MAX809LEUR-T remains suitable for industrial and commercial applications requiring the same performance envelope without formal automotive certification.
MAX809LEUR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MAX809LEUR-T FAQ
1.How can I place an order for MAX809LEUR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX809LEUR-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 MAX809LEUR-T reliable?
The price and inventory of MAX809LEUR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX809LEUR-T is usually 5 days.
3.What payment methods are accepted for MAX809LEUR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX809LEUR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX809LEUR-T?
MAX809LEUR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX809LEUR-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 MAX809LEUR-T?
For technical support, including MAX809LEUR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX809LEUR-T requirements.
6.How does Aetrix verify that MAX809LEUR-T is sourced from the original manufacturer or authorized distributors?
All MAX809LEUR-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 MAX809LEUR-T meets industry standards.
7.What is the process for return or replacement of MAX809LEUR-T?
All MAX809LEUR-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX809LEUR-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 MAX809LEUR-T part is unused and in its original packaging.
Return procedure for MAX809LEUR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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