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Analog Devices Inc. ADM809MART-REEL7
- Part No.:
- ADM809MART-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ADM809MART-REEL7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,969
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Product details
Overview
ADM809MART-REEL7 from Analog Devices is a microprocessor supervisory circuit in 3-lead SOT-23 package, providing push-pull active-low RESET output with 4.38 V reset threshold, 240 ms typical reset timeout, operation down to 1.0 V VCC, and 17 μA supply current. It monitors power supply integrity during power-up, brownout, and power-down in embedded controllers and instrumentation.
For engineers reviewing the ADM809MART-REEL7 datasheet, ADM809MART-REEL7 pinout, ADM809MART-REEL7 application, or ADM809MART-REEL7 equivalent, key selection criteria include reset threshold accuracy (±2.5% over −40°C to +125°C), guaranteed reset assertion at VCC ≥ 1 V, push-pull drive capability (3.2 mA sink), low-power operation, and SOT-23 footprint compatibility for space-constrained designs.
Technical Context
The ADM809MART-REEL7 integrates a precision voltage comparator with built-in glitch immunity and an internal 240 ms reset timer. Its reference circuit maintains stable threshold detection across temperature (30 ppm/°C drift) and supports operation from 1.0 V to 5.5 V supply range.
As a member of the ADM809 family, it features push-pull RESET output-unlike the open-drain ADM803-enabling direct interface to CMOS inputs without external pull-up resistors. It shares functional equivalence with ADM809 variants differing only in threshold voltage and packaging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38 V (typical), ±2.5% over −40°C to +125°C - ensures reliable reset assertion before microprocessor VCC falls below operational minimum. |
| Reset Timeout | 240 ms (typical), 140–460 ms over temperature - holds processor in reset long enough for power stabilization after turn-on. |
| Supply Current | 17 μA (typical at VCC < 3.6 V, −40°C to +85°C) - enables use in battery-powered and ultra-low-power systems. |
| VCC Operating Range | 1.0 V to 5.5 V - guarantees reset functionality even during deep brownout conditions where VCC drops near 1 V. |
| RESET Output Type | Push-pull active-low - drives logic directly without external components; sinks 3.2 mA at VTH min, eliminating pull-up resistor design overhead. |
| Temperature Range | −40°C to +125°C - qualified for automotive under-hood, industrial control, and harsh-environment applications. |
Pinout & Package
ADM809MART-REEL7 is housed in a 3-lead SOT-23 (RT-3) package per JEDEC TO-236-AB standard, with 1.3 mm × 2.9 mm footprint and 1.1 mm height. Pin 1 = GND, Pin 2 = RESET (active-low push-pull output), Pin 3 = VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Common return path for internal comparator and output stage; must be connected to system ground plane for accurate threshold sensing. |
| RESET (Pin 2) | Active-low push-pull output | Drives low during reset condition (VCC < 4.38 V); actively pulls high when deasserted - no external pull-up required. |
| VCC (Pin 3) | Monitored supply input | Connects to the voltage rail being supervised; powers internal circuitry and defines reset assertion boundary. |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | 4.38 V with ±2.5% tolerance over full temperature range - eliminates need for external trimming in 4.5 V nominal supply monitoring. |
| Ultra-low quiescent current | 17 μA typical - extends battery life in portable instrumentation and remote sensors without compromising supervision reliability. |
| Brownout detection down to 1 V | RESET remains asserted until VCC rises above 4.38 V, and continues asserting even as VCC collapses to 1.0 V - prevents spurious wake-up during failing supplies. |
| Glitch-immune comparator | Immune to transients ≤ 100 mV overdrive for durations up to 400 μs - rejects noise spikes on VCC without false resets. |
| Industrial temperature grade | −40°C to +125°C operation - supports deployment in motor drives, PLC modules, and automotive body electronics without derating. |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
|
Use Scenario: Monitors 5 V system rail in programmable logic controller during cold cranking and load dump events. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET to ARM Cortex-M7 MCU until 5 V rail stabilizes post-power-up and remains asserted during brownout dips below 4.38 V. Use Value: Prevents firmware corruption by guaranteeing MCU reset hold time ≥ 240 ms and enabling reliable restart after transient supply faults. |
Use Scenario: Supervises 5 V supply feeding CAN transceiver and microcontroller in door module exposed to −40°C ambient and 125°C under-hood thermal cycling. IC Role / Device Role / Timing Role: Voltage monitor with push-pull output directly driving MCU reset pin; operates continuously across full automotive temperature range without external biasing. Use Value: Eliminates need for external pull-up resistor and ensures deterministic reset behavior despite wide VCC variation and EMI-induced supply noise. |
| Medical Infusion Pump | Smart Energy Meter |
|
Use Scenario: Ensures safe startup and fault recovery in battery-backed infusion pump controller where power interruptions must trigger controlled shutdown and reinitialization. IC Role / Device Role / Timing Role: Resets microcontroller upon battery voltage sag below 4.38 V; asserts RESET down to 1.0 V VCC to capture final state before complete power loss. Use Value: Enables data retention and safe motor stop via guaranteed reset assertion during critical low-voltage transitions. |
Use Scenario: Monitors auxiliary 3.3 V rail powering metrology ADC and real-time clock in Class 0.5 smart meter operating in outdoor enclosures. IC Role / Device Role / Timing Role: Precision supervisor detecting undervoltage on isolated 3.3 V supply; provides clean, bounce-free reset signal to MSP430F67xx MCU. Use Value: Maintains measurement integrity by preventing ADC sampling during unstable supply conditions, supported by 30 ppm/°C threshold stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM809MAKSZ-REEL7 | Identical electrical specs and reset threshold (4.38 V), but in 3-lead SC70 (KS-3) package - 1.25 mm × 2.00 mm vs. SOT-23's 1.30 mm × 2.90 mm. | SC70 offers smaller footprint and lower thermal impedance (146°C/W vs. 270°C/W), preferred for ultra-dense PCB layouts. | Select ADM809MAKSZ-REEL7 when board area is constrained and thermal performance is prioritized over legacy SOT-23 compatibility. |
| TPS3808G18DBVR | TI part with 1.8 V threshold, 350 ms reset timeout, 2.5 μA quiescent current, and same SOT-23-3 package - not functionally interchangeable due to different threshold and timing. | Designed for low-voltage SoC supervision (e.g., 1.8 V core rails), not 4.5 V system rails; lacks 1 V minimum VCC operation. | Choose TPS3808G18DBVR only for 1.8 V applications; ADM809MART-REEL7 remains optimal for 4.38 V monitoring with extended brownout coverage. |
Compared with ADM809MAKSZ-REEL7, ADM809MART-REEL7 offers identical supervision functionality in a more widely adopted SOT-23 footprint with higher thermal resistance but broader assembly compatibility. Against TPS3808G18DBVR, ADM809MART-REEL7 delivers higher threshold accuracy, deeper brownout support, and proven robustness in industrial temperature-cycled environments - making it the preferred choice for 4.5 V system monitoring.
Availability
ADM809MART-REEL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical infusion pumps, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM809MART-REEL7 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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with R&D and manufacturing operations worldwide.
The ADM809 series belongs to Analog Devices' precision power monitoring product line, engineered specifically for reliable microprocessor reset generation in harsh industrial, automotive, and medical environments where supply integrity is mission-critical.
FAQ
What is the exact reset threshold voltage of ADM809MART-REEL7 and how does it vary with temperature?
The ADM809MART-REEL7 has a nominal reset threshold of 4.38 V at 25°C, with guaranteed range of 4.25 V to 4.50 V over −40°C to +85°C and 4.20 V to 4.56 V over −40°C to +125°C. This ±2.5% tolerance ensures consistent detection of 5 V rail undervoltage across full industrial temperature range without calibration.
Does ADM809MART-REEL7 require an external pull-up resistor on the RESET pin?
No. ADM809MART-REEL7 features a push-pull RESET output, meaning it actively drives both high and low states. Unlike open-drain variants (e.g., ADM803), it requires no external pull-up resistor - simplifying layout and reducing BOM count while ensuring fast, deterministic reset signaling.
Can ADM809MART-REEL7 operate when the monitored VCC drops below 2 V?
Yes. ADM809MART-REEL7 guarantees RESET assertion down to VCC = 1.0 V, maintaining valid logic-level output even during severe brownout. At VCC < 0.8 V, the output enters high-impedance state, but for all VCC ≥ 1.0 V, RESET remains fully functional and specified per datasheet limits.
What is the reset timeout duration of ADM809MART-REEL7 and is it adjustable?
The ADM809MART-REEL7 provides a fixed 240 ms typical reset timeout after VCC rises above threshold, with guaranteed minimum of 140 ms and maximum of 460 ms over −40°C to +85°C. This delay is internally generated and non-adjustable - designed to exceed typical microprocessor power-stabilization requirements without external timing components.
How does ADM809MART-REEL7 differ from ADM803 and ADM810 in the same family?
ADM809MART-REEL7 differs from ADM803 by using push-pull (not open-drain) RESET output, and from ADM810 by providing active-low (not active-high) RESET polarity. All three share identical threshold options, timing, and temperature specs - only output structure and logic polarity distinguish them within the ADM80x family.
ADM809MART-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- 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:
- 4.38V
- 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:
- SOT-23-3
ADM809MART-REEL7 FAQ
1.How can I place an order for ADM809MART-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM809MART-REEL7 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 ADM809MART-REEL7 reliable?
The price and inventory of ADM809MART-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM809MART-REEL7 is usually 5 days.
3.What payment methods are accepted for ADM809MART-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM809MART-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM809MART-REEL7?
ADM809MART-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM809MART-REEL7 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 ADM809MART-REEL7?
For technical support, including ADM809MART-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM809MART-REEL7 requirements.
6.How does Aetrix verify that ADM809MART-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADM809MART-REEL7 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 ADM809MART-REEL7 meets industry standards.
7.What is the process for return or replacement of ADM809MART-REEL7?
All ADM809MART-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM809MART-REEL7, 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 ADM809MART-REEL7 part is unused and in its original packaging.
Return procedure for ADM809MART-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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