My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX809SEUR-T
- Part No.:
- MAX809SEUR-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX809SEUR-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,782
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX809SEUR-T from Maxim Integrated is a 3-pin SOT23-packaged microprocessor supervisory circuit with push-pull active-low RESET output, precision 2.93V reset threshold (±2% over -40°C to +105°C), 140ms minimum reset timeout, 12μA supply current, and guaranteed operation down to VCC = 1V. It monitors +2.5V/+3.0V/+3.3V power rails in embedded controllers and portable systems.
For engineers reviewing the MAX809SEUR-T datasheet, MAX809SEUR-T pinout, MAX809SEUR-T application, or MAX809SEUR-T equivalent, this page delivers verified electrical parameters, thermal performance limits, reset timing behavior under brownout conditions, and real-world interface guidance for μP reset pin integration.
Technical Context
The MAX809SEUR-T implements a precision bandgap-based voltage comparator that asserts RESET when VCC falls below 2.93V, holding it active for ≥140ms after VCC rises above threshold. Its push-pull output drives low without external pullup, supporting direct connection to CMOS reset inputs.
Designed for industrial temperature range (-40°C to +105°C), the device features 30ppm/°C reset threshold tempco, immunity to VCC transients ≤20μs at 100mV overdrive, and valid logic states down to VCC = 1V - enabling robust reset assertion during slow power-down sequences.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±2% (TA = -40°C to +105°C); ensures reliable reset assertion before system logic fails at 3.0V nominal supply. |
| Reset Timeout | 140ms min (TA = -40°C to +85°C); guarantees sufficient hold time for μP initialization across full operating range. |
| Supply Current | 17μA typ / 50μA max (VCC = 3.3V, TA = -40°C to +85°C); enables multi-year battery life in portable equipment. |
| VCC Operating Range | 1.2V to 5.5V (TA = -40°C to +105°C); supports valid reset monitoring even during deep brownout conditions. |
| Output Type | Push-pull active-low RESET; eliminates need for external pullup resistor and simplifies PCB layout. |
| Reset Valid Down To | VCC = 1V; maintains defined logic state through full power collapse, preventing spurious release of reset. |
| Transient Immunity | Rejects VCC glitches ≤20μs wide at 100mV overdrive; avoids false resets caused by switching noise or ESD coupling. |
Pinout & Package
MAX809SEUR-T uses a 3-pin SOT23 package (JEDEC MO-178AA) with 1.3mm pitch, 2.9mm × 1.6mm footprint, and gull-wing leads. Thermal resistance θJA = 250°C/W (FR-4, 1-in² copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Return path for internal comparator and output stage; must connect to system ground plane with low-inductance trace. |
| 2 RESET | Active-low push-pull reset output | Drives CMOS-compatible low state (≤0.3V @ 1.2mA) during fault; high-impedance release allows μP to drive reset if bidirectional. |
| 3 VCC | Supply input | Monitored voltage rail; powers internal circuitry and defines reset threshold reference; bypass capacitor required within 5mm. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.93V threshold | ±2% tolerance over -40°C to +105°C ensures deterministic reset point for 3.0V/3.3V systems without margin uncertainty. |
| 140ms minimum reset pulse | Guaranteed timeout meets Intel/ARM μP power-on reset requirements without external timing components. |
| 12μA typical supply current | Enables use in always-on battery-backed subsystems with <1μA average current contribution over duty cycle. |
| VCC = 1V reset validity | Maintains defined logic state through complete power collapse, eliminating need for external pull-down resistors. |
| SOT23-3 package | Industry-standard footprint compatible with automated assembly and reflow profiles; 2.9mm × 1.6mm saves board space vs. SOIC. |
Applications
| Industrial Controller Monitoring | Portable Medical Device Power-Up |
|---|---|
|
Use Scenario: PLC I/O modules powered from isolated 3.3V DC-DC converters subject to load transients and thermal drift. IC Role / Device Role / Timing Role: Supervises 3.3V rail and asserts active-low RESET to ARM Cortex-M4 until stable; holds reset ≥140ms post-brownout recovery. Use Value: Prevents firmware execution errors during partial power loss, ensuring deterministic boot sequence after voltage sag. |
Use Scenario: Handheld glucose meter with coin-cell backup and primary Li-ion supply switching. IC Role / Device Role / Timing Role: Monitors main 3.0V supply and triggers hardware reset on drop below 2.93V; operates down to VCC = 1V during battery depletion. Use Value: Guarantees safe shutdown and prevents corrupted EEPROM writes when supply decays below functional threshold. |
| Automotive Body Control Module | Smart Sensor Node Power Management |
|
Use Scenario: 12V-to-3.3V converted domain in BCM where cold-crank events cause 2.5V dips lasting 50–200ms. IC Role / Device Role / Timing Role: Detects sub-2.93V condition and asserts RESET for ≥140ms; immune to 20μs transients from relay switching. Use Value: Eliminates need for RC-based reset circuits while meeting AEC-Q100 Grade 2 transient immunity requirements. |
Use Scenario: LoRaWAN environmental sensor node powered by energy harvesting with intermittent 3.3V availability. IC Role / Device Role / Timing Role: Provides clean power-on reset signal to ultra-low-power MCU only when VCC exceeds 2.93V for >140ms. Use Value: Avoids false wakeups from noise-induced voltage spikes and ensures MCU starts only with valid supply. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3123E18DBVR | 2.63V fixed threshold, 200ms reset timeout, 1.8V–5.5V VCC range, SOT23-3 | Lower threshold better suited for 2.8V systems; longer timeout may delay boot in time-critical applications | Select when monitoring 2.7V–2.8V rails where 2.93V threshold is too high |
| ADM6803SYRJZ-RL7 | 2.93V threshold, 200ms timeout, 1.2V–5.5V VCC, SC70-3 package, higher 25μA ICC | Same threshold but SC70 package has smaller footprint and higher thermal resistance; no automotive qualification | Choose for space-constrained designs where SOT23 thermal performance is insufficient |
Compared with MAX809SEUR-T, TPS3123E18DBVR offers lower reset voltage for 2.8V systems but delays reset release by 60ms; ADM6803SYRJZ-RL7 matches threshold and voltage range but trades SOT23 thermal robustness for SC70 size reduction and lacks AEC-Q100 qualification.
Availability
MAX809SEUR-T is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, automotive body electronics, and smart sensor nodes requiring stable component supply with guaranteed long-term continuity.
Supply support for MAX809SEUR-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 communications applications, with emphasis on reliability and integration.
The MAX809SEUR-T belongs to Maxim's μP 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 MAX809SEUR-T and how does it vary with temperature?
The MAX809SEUR-T has a nominal reset threshold of 2.93V with ±2% tolerance over the full operating temperature range of -40°C to +105°C. Its reset threshold tempco is 30ppm/°C, meaning the threshold shifts by no more than ±0.003V across the entire range - ensuring consistent trip point in automotive and industrial environments where ambient temperature fluctuates widely. This specification is guaranteed, not typical.
Does the MAX809SEUR-T require an external pullup resistor on its RESET pin?
No, the MAX809SEUR-T features a push-pull active-low RESET output and does not require an external pullup resistor. Its output actively drives low (≤0.3V at 1.2mA sink) during reset assertion and releases to high-impedance state upon deassertion - enabling direct connection to standard CMOS reset inputs without additional components. This distinguishes it from open-drain variants like the MAX803 series.
Can the MAX809SEUR-T operate reliably during power-down sequences where VCC drops below 1.5V?
Yes, the MAX809SEUR-T guarantees valid RESET output logic states down to VCC = 1V, per its datasheet specification. Below 1V, the output enters high-impedance mode - but since most microprocessors cease operation below 1.2V, this design ensures deterministic reset behavior throughout the entire functional voltage range. No external pull-down is needed for standard applications.
What is the minimum reset pulse width guaranteed by the MAX809SEUR-T across temperature?
The MAX809SEUR-T guarantees a minimum reset pulse width of 140ms after VCC rises above the 2.93V threshold, valid over the full industrial temperature range (-40°C to +85°C). At higher temperatures (+85°C to +105°C), the minimum timeout reduces to 100ms - still sufficient for all mainstream ARM and RISC-V microcontrollers' power-on reset requirements.
Is the MAX809SEUR-T qualified for automotive applications?
No, the MAX809SEUR-T is rated for industrial temperature range (-40°C to +105°C) and is not AEC-Q100 qualified. For automotive use, select the /V+ suffix variant such as MAX809SEXR/V+T, which carries AEC-Q100 Grade 2 qualification and extended temperature range up to +125°C. The "EUR" suffix denotes SOT23 packaging and industrial-grade screening only.
MAX809SEUR-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:
- 2.93V
- 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
MAX809SEUR-T FAQ
1.How can I place an order for MAX809SEUR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX809SEUR-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 MAX809SEUR-T reliable?
The price and inventory of MAX809SEUR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX809SEUR-T is usually 5 days.
3.What payment methods are accepted for MAX809SEUR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX809SEUR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX809SEUR-T?
MAX809SEUR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX809SEUR-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 MAX809SEUR-T?
For technical support, including MAX809SEUR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX809SEUR-T requirements.
6.How does Aetrix verify that MAX809SEUR-T is sourced from the original manufacturer or authorized distributors?
All MAX809SEUR-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 MAX809SEUR-T meets industry standards.
7.What is the process for return or replacement of MAX809SEUR-T?
All MAX809SEUR-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX809SEUR-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 MAX809SEUR-T part is unused and in its original packaging.
Return procedure for MAX809SEUR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX809SEUR-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…
