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Analog Devices Inc. ADM809SAKSZ-REEL
- Part No.:
- ADM809SAKSZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
ADM809SAKSZ-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,442
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Product details
Overview
ADM809SAKSZ-REEL from Analog Devices is a 3-pin SOT-23 push-pull microprocessor supervisory circuit with 2.93 V reset threshold, 240 ms power-on reset timeout (typical), 17 μA supply current, and operation down to 1 V VCC. It monitors 3.3 V supply rails in embedded controllers and intelligent instruments requiring reliable brownout detection.
For engineers reviewing the ADM809SAKSZ-REEL datasheet, ADM809SAKSZ-REEL pinout, ADM809SAKSZ-REEL application, or ADM809SAKSZ-REEL equivalent, key selection criteria include reset threshold accuracy (±2.5% over −40°C to +125°C), push-pull output drive capability (800 μA sink/source), and guaranteed reset assertion at VCC ≥ 1 V - critical for low-voltage system stability during power sequencing.
Technical Context
The ADM809SAKSZ-REEL integrates a precision bandgap voltage reference and comparator with built-in glitch immunity to reject fast transients on VCC up to 100 mV overdrive. Its internal timer ensures a minimum 140 ms (min) / 240 ms (typ) / 460 ms (max) reset pulse width during power-up across −40°C to +125°C.
Unlike open-drain variants (e.g., ADM803), this device uses a push-pull RESET output capable of sourcing 500–800 μA and sinking 1.2–3.2 mA, eliminating external pull-up resistors and enabling direct interface with CMOS/TTL logic inputs without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93 V (typ), ±2.5% over full temperature range - ensures accurate 3.3 V rail monitoring with margin against undervoltage faults |
| Reset Timeout | 240 ms (typ), 140–460 ms (min–max) - guarantees sufficient microprocessor initialization time before release |
| Supply Current | 17 μA (typ) at VCC < 3.6 V - enables use in battery-powered portable systems without compromising runtime |
| VCC Operating Range | 1.0 V to 5.5 V - supports valid reset assertion even during deep brownout conditions down to 1 V |
| Output Type | Push-pull active-low RESET - drives logic inputs directly without external components; sinks 3.2 mA at VTH min |
| Temp Range | −40°C to +125°C - qualified for automotive under-hood and industrial control environments |
| Reset Accuracy Drift | 30 ppm/°C - maintains tight threshold stability across wide ambient variations |
Pinout & Package
ADM809SAKSZ-REEL is housed in a 3-lead SOT-23 (RT-3) package per JEDEC TO-236-AB, with 1.3 mm × 2.9 mm footprint and 0.95 mm height - compatible with standard high-volume pick-and-place assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground Reference | 0 V return path for internal reference and output stage; must be connected to system ground plane |
| 2 (RESET) | Active-Low Push-Pull Output | Drives low during reset (V<sub>OL |
| 3 (VCC) | Supply Input | Monitored voltage rail input; powers internal circuitry and defines reset threshold reference point |
Key Features
| Feature | Design Value |
|---|---|
| Precision Voltage Monitoring | 2.93 V threshold with ±2.5% tolerance over −40°C to +125°C - eliminates need for external calibration in 3.3 V systems |
| Glitch-Immune Comparator | Rejects transients ≤ 100 μs duration at VTH − VCC ≥ 100 mV - prevents false resets from switching noise or ESD |
| Low-Voltage Reset Assertion | Valid RESET signal asserted down to VCC = 1.0 V - ensures deterministic behavior during deep brownouts |
| Ultra-Low Quiescent Current | 17 μA typical supply draw - reduces standby power in always-on IoT edge nodes and portable instrumentation |
| Wide Temperature Qualification | Specified from −40°C to +125°C - meets AEC-Q100 Grade 1 requirements for automotive body electronics |
Applications
| Industrial PLC Controllers | Medical Diagnostic Handhelds |
|---|---|
Use Scenario: Power sequencing in programmable logic controller CPU modules where 3.3 V I/O rails must stabilize before firmware execution. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET until 3.3 V rail exceeds 2.93 V and remains stable for 240 ms. Use Value: Prevents corrupted register writes and bus contention during cold start by guaranteeing minimum reset hold time independent of input capacitor size. | Use Scenario: Battery-backed patient monitor with dual 3.3 V/5 V supplies where brownout detection must function below 1.5 V VCC. IC Role / Device Role / Timing Role: Primary reset generator monitoring main 3.3 V rail; asserts RESET during battery sag or charger disconnect events. Use Value: Enables safe shutdown and data preservation by triggering controlled firmware save routines before VCC drops below MCU operational minimum. |
| Automotive Body Control Modules | Smart Energy Meters |
Use Scenario: Wake-up supervision in LIN gateway nodes exposed to load-dump and cold-crank conditions. IC Role / Device Role / Timing Role: Monitors 3.3 V domain derived from buck converter; provides glitch-immune reset during 12 V battery dips to 6 V. Use Value: Eliminates spurious reboots caused by alternator ripple or relay switching noise due to built-in transient rejection. | Use Scenario: Tamper-resistant meter with real-time clock and flash memory requiring deterministic reset during AC line dropout. IC Role / Device Role / Timing Role: Resets microcontroller when 3.3 V backup rail falls below 2.93 V during capacitor discharge phase. Use Value: Ensures EEPROM write completion and RTC state preservation by extending reset hold time beyond capacitor decay curve. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SSTR | 2.93 V threshold, SOT-23, push-pull output, but 20 μA supply current and −40°C to +85°C rating only | Limited to commercial-temperature industrial equipment; lacks extended 125°C qualification | Select when cost sensitivity outweighs automotive/industrial temp range needs |
| TPS3808G33DBVR | 3.3 V threshold (not 2.93 V), 350 ms reset timeout, 1.6 μA quiescent current, but requires external capacitor for timeout adjustment | Requires board-level tuning for timing; mismatched threshold necessitates redesign of 3.3 V rail margining | Choose only if longer reset timeout and ultra-low power dominate design priorities |
Compared with MAX809SSTR and TPS3808G33DBVR, ADM809SAKSZ-REEL delivers tighter threshold accuracy over extended temperature, lower supply current than MAX809SSTR, and fixed factory-trimmed timing that avoids layout-dependent capacitor tolerances - making it optimal for production-critical 3.3 V systems needing drop-in reliability.
Availability
ADM809SAKSZ-REEL is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical handheld diagnostics, and smart energy meters requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for ADM809SAKSZ-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' precision supervisory IC portfolio, engineered specifically for deterministic power-on reset generation in microprocessor-based systems operating under harsh thermal and electrical conditions.
FAQ
What is the exact reset threshold voltage of ADM809SAKSZ-REEL and how does it vary with temperature?
The ADM809SAKSZ-REEL has a nominal reset threshold of 2.93 V at 25°C, with guaranteed limits of 2.85 V to 3.00 V over −40°C to +85°C and 2.81 V to 3.05 V over −40°C to +125°C. Its temperature coefficient is 30 ppm/°C, meaning threshold drift is ≤ ±0.3% across the full industrial range - sufficient for robust 3.3 V rail monitoring without derating.
Does ADM809SAKSZ-REEL require an external pull-up resistor on the RESET pin?
No, ADM809SAKSZ-REEL features a push-pull RESET output and does not require an external pull-up resistor. It actively drives high (≥ VCC − 1.5 V) and low (≤ 0.4 V) with specified sink/source current, unlike open-drain variants such as ADM803. This simplifies PCB layout and reduces BOM count.
What is the minimum VCC voltage at which ADM809SAKSZ-REEL continues to assert RESET reliably?
ADM809SAKSZ-REEL guarantees valid RESET assertion down to VCC = 1.0 V, as confirmed in the Absolute Maximum Ratings table and General Description. Below 1.0 V, output behavior is unspecified - ensuring deterministic reset hold during deep brownout conditions common in battery-backed systems.
How does the reset timeout of ADM809SAKSZ-REEL behave across temperature and process variation?
The ADM809SAKSZ-REEL reset timeout is factory-trimmed to 240 ms typical, with a guaranteed range of 140 ms (min) to 460 ms (max) over −40°C to +85°C, and 100 ms to 840 ms over +85°C to +125°C. This variation is fully characterized and documented in Table 1, enabling reliable timing margining in safety-critical designs.
Can ADM809SAKSZ-REEL be used to monitor a 5 V supply rail?
No - ADM809SAKSZ-REEL is specifically configured for 2.93 V threshold and optimized for 3.3 V systems. For 5 V rail monitoring, select ADM809LAKSZ-REEL (4.63 V) or ADM809JAKSZ-REEL (4.00 V). Using ADM809SAKSZ-REEL on 5 V would cause immediate, continuous reset assertion due to VCC exceeding threshold by >70%.
ADM809SAKSZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
ADM809SAKSZ-REEL FAQ
1.How can I place an order for ADM809SAKSZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM809SAKSZ-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 ADM809SAKSZ-REEL reliable?
The price and inventory of ADM809SAKSZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM809SAKSZ-REEL is usually 5 days.
3.What payment methods are accepted for ADM809SAKSZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM809SAKSZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM809SAKSZ-REEL?
ADM809SAKSZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM809SAKSZ-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 ADM809SAKSZ-REEL?
For technical support, including ADM809SAKSZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM809SAKSZ-REEL requirements.
6.How does Aetrix verify that ADM809SAKSZ-REEL is sourced from the original manufacturer or authorized distributors?
All ADM809SAKSZ-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 ADM809SAKSZ-REEL meets industry standards.
7.What is the process for return or replacement of ADM809SAKSZ-REEL?
All ADM809SAKSZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM809SAKSZ-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 ADM809SAKSZ-REEL part is unused and in its original packaging.
Return procedure for ADM809SAKSZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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