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Analog Devices Inc. ADM809LARTZ-REEL
- Part No.:
- ADM809LARTZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ADM809LARTZ-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,361
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Product details
Overview
ADM809LARTZ-REEL from Analog Devices is a microprocessor supervisory circuit with push-pull active-low RESET output, 4.63 V reset threshold, 140–460 ms power-on reset timeout, and operation down to 1 V VCC. It monitors supply voltage in embedded microcontroller systems and asserts reset during power-up, brownout, or power-down events.
For engineers reviewing the ADM809LARTZ-REEL datasheet, ADM809LARTZ-REEL pinout, ADM809LARTZ-REEL application, or ADM809LARTZ-REEL equivalent, key selection criteria include reset threshold accuracy (±2.5% over −40°C to +125°C), low 17 μA quiescent current, SOT-23-3 package compatibility, and guaranteed reset assertion at VCC ≥ 1 V.
Technical Context
The ADM809LARTZ-REEL integrates a precision voltage comparator with built-in glitch immunity and an internal 240 ms (typical) reset timer. Its reference circuit maintains stable threshold performance across temperature (30 ppm/°C), enabling reliable detection of supply droops as small as 100 mV below VTH within 20 μs.
It features a push-pull RESET output capable of sinking 3.2 mA at VTH min (0.4 V max low-level) and sourcing 800 μA at VTH max (VCC − 1.5 V high-level). The device operates continuously from VCC = 1.0 V to 5.5 V across −40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63 V (±2.5% over −40°C to +125°C); ensures reliable reset assertion for 5 V nominal supplies under worst-case tolerance and temperature drift. |
| Reset Timeout | 140–460 ms (−40°C to +85°C); guarantees microprocessor remains held in reset until power stabilizes after cold start or brownout recovery. |
| Supply Current | 17 μA typical (VCC < 3.6 V, −40°C to +85°C); enables integration into battery-powered or energy-sensitive embedded systems without significant load. |
| VCC Operating Range | 1.0 V to 5.5 V; supports valid reset assertion even during deep undervoltage conditions, extending system fault coverage beyond typical LDO dropout limits. |
| Output Type | Push-pull active-low RESET; eliminates need for external pull-up resistor and provides defined logic levels under all operating conditions. |
| Temperature Range | −40°C to +125°C; qualified for automotive under-hood, industrial control, and harsh-environment applications requiring extended thermal reliability. |
| Reset Propagation Delay | 20 μs (VCC falling from VTH to VTH − 100 mV); fast response prevents spurious resets during transient supply noise or ripple. |
Pinout & Package
ADM809LARTZ-REEL uses a 3-lead SOT-23 (RT-3) package, 2.90 mm × 1.30 mm footprint, 1.12 mm height, JEDEC-compliant outline with coplanarity ≤ 0.10 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground Reference | 0 V return path for internal comparator and output driver; must be connected directly to system ground plane for noise immunity and accurate threshold sensing. |
| 2 (RESET) | Active-Low Push-Pull Output | Drives low during reset condition (VCC < 4.63 V) and high otherwise; sinks up to 3.2 mA, sources up to 800 μA; compatible with CMOS/TTL inputs without external biasing. |
| 3 (VCC) | Monitored Supply Input | Primary power input and voltage sense node; internally decoupled; requires local 0.1 μF ceramic capacitor placed within 2 mm of pin for stable reset timing and noise rejection. |
Key Features
| Feature | Design Value |
|---|---|
| Precision Reset Threshold | 4.63 V ±2.5% over full temperature range ensures deterministic reset behavior for 5 V systems despite supply tolerance stack-up and aging. |
| Ultra-Low Quiescent Current | 17 μA typical enables >10-year battery life in always-on monitoring circuits and reduces self-heating in thermally constrained enclosures. |
| Brownout Detection Down to 1 V | Guaranteed RESET assertion at VCC ≥ 1.0 V allows early fault detection before microcontroller enters undefined state or corrupts memory during deep undervoltage. |
| Glitch-Immune Comparator | Built-in filtering rejects fast transients ≤ 100 μs duration on VCC, preventing false resets caused by switching noise or ESD-induced supply bounce. |
| Extended Temperature Operation | Rated for −40°C to +125°C ambient enables use in automotive engine control units, industrial PLCs, and outdoor telecom equipment without derating. |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Monitors 5 V supply rail powering ARM Cortex-M7-based controller in programmable logic controller cabinet exposed to wide ambient temperature swings and conducted EMI. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET to hold MCU in known state during AC line sags, relay coil de-energization transients, or hot-swap events. Use Value: 4.63 V threshold matches nominal 5 V rail with margin for ripple and tolerance; 17 μA current minimizes heat in sealed enclosure; 1 V minimum VCC operation prevents lockup during slow power decay. | Use Scenario: Embedded in door module controlling window lift, mirror fold, and interior lighting, powered from vehicle battery via 5 V LDO with variable load and cold-cranking dips. IC Role / Device Role / Timing Role: Voltage monitor generating clean, glitch-free reset pulse to ensure microcontroller boots only after stable 5 V rail is established post-cold crank. Use Value: 140–460 ms timeout accommodates slow LDO startup; −40°C to +125°C rating covers under-dash mounting; push-pull output drives MCU reset pin directly without pull-up. |
| Medical Infusion Pump Controller | Smart Energy Meter MCU |
Use Scenario: Ensures fail-safe restart of safety-critical infusion pump MCU after mains interruption or internal DC-DC converter fault, operating in Class II medical environment. IC Role / Device Role / Timing Role: Primary reset supervisor asserting RESET during brownout and holding it for ≥140 ms to guarantee complete RAM initialization and watchdog setup before main firmware executes. Use Value: 30 ppm/°C tempco ensures threshold stability across operating temperature; 1 V VCC operation detects pre-failure supply collapse; RoHS-compliant SOT-23 package meets medical regulatory requirements. | Use Scenario: Monitors isolated 5 V supply feeding metrology SoC and communication interface in utility-grade electricity meter deployed outdoors with wide seasonal temperature variation. IC Role / Device Role / Timing Role: Power-on supervisor providing deterministic reset to prevent corrupted flash writes or incorrect timekeeping during grid reconnection after outage. Use Value: Guaranteed operation at −40°C enables deployment in arctic climates; 460 ms max timeout covers worst-case LDO settling; low leakage preserves backup capacitor charge during extended outages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809LUR+T | 4.63 V threshold, SOT-23-3, push-pull active-low RESET, but 20 μA typical supply current and −40°C to +85°C rating only. | Limited to commercial/industrial ambient; lacks extended temperature qualification required for automotive or outdoor deployments. | Select when cost sensitivity outweighs extended temperature needs and 3 μA higher quiescent current is acceptable. |
| TPS3808G15DBVR | 4.63 V threshold, SOT-23-6 (6-pin), open-drain RESET, adjustable delay option, 1.6 μA typical current, −40°C to +125°C rated. | Requires external pull-up resistor and PCB layout change due to different pin count and output topology; lower current benefits ultra-low-power designs. | Choose when ultra-low power dominates and board redesign is feasible; avoid if pin count or push-pull drive is mandatory. |
Compared with MAX809LUR+T, ADM809LARTZ-REEL delivers extended temperature support and lower supply current; versus TPS3808G15DBVR, it offers pin-compatible SOT-23-3 integration and push-pull simplicity at the cost of higher quiescent draw-making it optimal for space-constrained, thermally demanding 5 V systems needing minimal BOM count.
Availability
ADM809LARTZ-REEL is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical infusion pump controllers, and smart energy meter MCUs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM809LARTZ-REEL 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The ADM809 series belongs to Analog Devices' microprocessor supervisory product line, designed specifically to provide robust, low-power, precision reset functionality for mission-critical embedded systems operating in harsh thermal and electrical environments.
FAQ
What is the exact reset threshold voltage of the ADM809LARTZ-REEL and how does it vary with temperature?
The ADM809LARTZ-REEL has a nominal reset threshold of 4.63 V, specified as 4.50 V to 4.75 V over −40°C to +85°C and 4.44 V to 4.82 V over −40°C to +125°C. Its temperature coefficient is 30 ppm/°C, meaning threshold drift is bounded and predictable-critical for maintaining reset margin in automotive or industrial applications where ambient extremes affect supply regulation.
Does the ADM809LARTZ-REEL require an external pull-up resistor on its RESET pin?
No, the ADM809LARTZ-REEL features a push-pull RESET output, so no external pull-up resistor is needed. It actively drives high (to VCC − 1.5 V at 800 μA) and low (to 0.4 V max at 3.2 mA), ensuring clean, rail-to-rail logic levels compatible with standard CMOS inputs without additional components-reducing BOM count and PCB area.
Can the ADM809LARTZ-REEL operate reliably when the supply voltage drops below 2 V?
Yes, the ADM809LARTZ-REEL guarantees RESET assertion down to VCC = 1.0 V across its full −40°C to +125°C temperature range. This capability enables early fault detection before the monitored microcontroller enters an undefined operational state, supporting safe shutdown or last-gasp data logging in brownout scenarios.
What is the power-on reset timeout duration for the ADM809LARTZ-REEL and is it adjustable?
The ADM809LARTZ-REEL provides a fixed power-on reset timeout of 140 ms minimum to 460 ms maximum over −40°C to +85°C, with wider variation (100 ms to 840 ms) at +85°C to +125°C. This timeout is internally generated and non-adjustable-ensuring consistent, factory-trimmed timing without external capacitors or configuration pins.
How does the ADM809LARTZ-REEL handle fast transients on the VCC line?
The ADM809LARTZ-REEL incorporates a glitch-immune reset comparator that rejects transients ≤ 100 μs duration on VCC, as verified in Figure 11 of its datasheet. This design prevents false resets caused by switching regulator noise, ESD coupling, or relay contact bounce-ensuring only sustained supply faults trigger reset, improving system robustness in electrically noisy environments.
ADM809LARTZ-REEL 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:
- Active
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
ADM809LARTZ-REEL FAQ
1.How can I place an order for ADM809LARTZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM809LARTZ-REEL 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 ADM809LARTZ-REEL reliable?
The price and inventory of ADM809LARTZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM809LARTZ-REEL is usually 5 days.
3.What payment methods are accepted for ADM809LARTZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM809LARTZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM809LARTZ-REEL?
ADM809LARTZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM809LARTZ-REEL 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 ADM809LARTZ-REEL?
For technical support, including ADM809LARTZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM809LARTZ-REEL requirements.
6.How does Aetrix verify that ADM809LARTZ-REEL is sourced from the original manufacturer or authorized distributors?
All ADM809LARTZ-REEL 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 ADM809LARTZ-REEL meets industry standards.
7.What is the process for return or replacement of ADM809LARTZ-REEL?
All ADM809LARTZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM809LARTZ-REEL, 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 ADM809LARTZ-REEL part is unused and in its original packaging.
Return procedure for ADM809LARTZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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