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Analog Devices Inc. ADM803RAKS-REEL7
- Part No.:
- ADM803RAKS-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
ADM803RAKS-REEL7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,138
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Product details
Overview
ADM803RAKS-REEL7 from Analog Devices is a microprocessor supervisory circuit with open-drain active-low RESET output, 2.63 V reset threshold, and operation down to 1.0 V VCC. It provides 240 ms typical power-on reset timeout, consumes only 17 μA at 3.6 V, and is housed in a 3-lead SC70 package for space-constrained embedded systems.
For engineers reviewing the ADM803RAKS-REEL7 datasheet, ADM803RAKS-REEL7 pinout, ADM803RAKS-REEL7 application, or ADM803RAKS-REEL7 equivalent, key selection criteria include reset threshold accuracy (±2.5% over −40°C to +125°C), guaranteed operation below 1 V VCC, open-drain output requiring external pull-up, and SC70 footprint compatibility with low-power microcontroller power rails.
Technical Context
The ADM803RAKS-REEL7 integrates a precision voltage comparator with built-in glitch immunity and an internal 240 ms reset timer. Its reset assertion remains valid even as VCC drops to 1.0 V, enabling reliable brownout detection in battery-backed or dynamically scaled systems.
Unlike push-pull variants (ADM809/ADM810), the ADM803RAKS-REEL7 uses an open-drain RESET output, mandating an external pull-up resistor for logic-level translation and enabling wired-OR reset bus configurations across multiple supervisors or peripherals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63 V (typical), ±2.5% over −40°C to +125°C - ensures stable reset activation for 2.7 V nominal supply rails |
| Supply Voltage Range | 1.0 V to 5.5 V - supports operation during deep brownout and ultra-low-power wake-up sequences |
| Supply Current | 17 μA (typical at VCC < 3.6 V, −40°C to +85°C) - enables integration into always-on monitoring circuits without significant battery drain |
| Reset Timeout | 240 ms (typical), 140–460 ms over temperature - guarantees sufficient microprocessor initialization time after power stabilization |
| RESET Output Type | Open-drain, active-low - allows flexible voltage translation via external pull-up and supports multi-source reset arbitration |
| Output Low Voltage | 0.3 V at 1.2 mA sink (VCC = VTH min) - ensures solid logic-low assertion into CMOS inputs across full operating range |
| Temperature Range | −40°C to +125°C - qualified for under-hood automotive, industrial control, and extended-environment applications |
Pinout & Package
ADM803RAKS-REEL7 is packaged in a 3-lead SC70 (KS-3) surface-mount package measuring 2.00 mm × 1.25 mm × 0.95 mm, optimized for high-density PCB layouts and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal circuitry and reset comparator; must be connected directly to system ground plane |
| 2 | RESET | Open-drain active-low output; requires external pull-up resistor (typically 10–100 kΩ) to target logic rail (e.g., 3.3 V or 5 V) |
| 3 | VCC | Monitored supply input; powers the device and serves as the reference for reset threshold detection |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | 2.63 V with ±2.5% tolerance over −40°C to +125°C - eliminates need for external trimming in 2.7 V system monitoring |
| Ultra-low quiescent current | 17 μA typical - extends battery life in portable and energy-harvesting applications |
| Brownout detection down to 1.0 V VCC | Guaranteed RESET assertion until VCC falls below 1.0 V - prevents spurious MCU execution during final power collapse |
| Glitch-immune comparator | Immune to transients ≤100 μs at 100 mV overdrive - rejects noise spikes without false resets |
| SC70 footprint | 2.00 mm × 1.25 mm body size - saves >40% board area versus SOT-23 while maintaining compatibility with standard pick-and-place equipment |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Monitors 2.7 V auxiliary rail powering ARM Cortex-M4-based controller during cold-crank and load-dump events. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET until VCC stabilizes above 2.63 V and holds for 240 ms post-rail rise. Use Value: Prevents firmware corruption by ensuring CPU remains held in reset during unstable 2.7 V rail recovery, meeting ISO 16750-2 transient immunity requirements. |
Use Scenario: Embedded in door module ECU to supervise 3.3 V microcontroller supply during battery voltage sag below 9 V. IC Role / Device Role / Timing Role: Open-drain RESET output wired-OR'd with other subsystem supervisors to drive single global reset line to MCU. Use Value: Enables coordinated system-wide reset initiation using shared pull-up, reducing component count and simplifying fault-tree analysis. |
| Portable Medical Sensor Hub | Smart Energy Meter |
Use Scenario: Powers on from coin-cell battery; monitors 2.8 V LDO output feeding ultra-low-power BLE SoC. IC Role / Device Role / Timing Role: Provides 240 ms power-on reset while consuming only 17 μA - minimizing startup current surge and preserving battery charge. Use Value: Eliminates need for RC-based reset timers, improving timing accuracy and reducing bill-of-materials cost and PCB area. |
Use Scenario: Supervises 3.3 V real-time clock and metrology ASIC supply in tamper-resistant meter housing exposed to wide ambient temperatures. IC Role / Device Role / Timing Role: Delivers guaranteed reset assertion from −40°C to +125°C with ±2.5% threshold stability - ensuring reliable RTC initialization across environmental extremes. Use Value: Meets IEC 62053-21 accuracy requirements for timekeeping integrity during thermal cycling and voltage transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM809RAKSZ-REEL7 | Push-pull active-low RESET output; same 2.63 V threshold and SC70 package | Eliminates need for external pull-up; incompatible with wired-OR reset buses | Select when driving single-load CMOS inputs directly and board space permits minor layout revision |
| TPS3808G12DBVR | 2.63 V threshold, push-pull output, 1.5 μA quiescent current, SOT-23-5 package | Lower power but larger footprint and different pinout; lacks sub-1 V operation | Prefer for ultra-low-power designs where VCC never drops below 1.8 V and SOT-23-5 is acceptable |
Compared with ADM803RAKS-REEL7, ADM809RAKSZ-REEL7 simplifies BOM by removing the pull-up resistor but sacrifices reset bus flexibility, while TPS3808G12DBVR reduces supply current by 90% yet forfeits critical 1.0 V brownout detection capability and requires PCB redesign due to 5-pin SOT-23 packaging.
Availability
ADM803RAKS-REEL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, portable medical sensor hubs, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM803RAKS-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 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 ADM803 series belongs to Analog Devices' microprocessor supervisory product line, engineered specifically for robust, low-power reset generation in space- and energy-constrained embedded systems operating across harsh thermal and voltage environments.
FAQ
What is the exact reset threshold voltage of the ADM803RAKS-REEL7 and how does it vary with temperature?
The ADM803RAKS-REEL7 has a nominal reset threshold of 2.63 V at 25°C, with guaranteed limits of 2.52 V to 2.74 V over the full −40°C to +125°C operating range. This ±2.5% tolerance ensures reliable activation for 2.7 V supply rails while accommodating manufacturing variation and thermal drift without requiring external calibration. The device's 30 ppm/°C temperature coefficient contributes to this tight specification.
Does the ADM803RAKS-REEL7 support operation below 1.5 V VCC, and what happens to the RESET output at low voltage?
Yes, the ADM803RAKS-REEL7 is fully specified to operate down to 1.0 V VCC and continues asserting RESET until VCC falls below that level. At VCC < 0.8 V, the output transitions to high-impedance; therefore, a 100 kΩ pull-down resistor is recommended on the RESET line to prevent floating states during deep brownout - a design detail explicitly documented in the ADM803/ADM809/ADM810 datasheet Figure 12.
Why does the ADM803RAKS-REEL7 use an open-drain output instead of push-pull, and what external component is required?
The ADM803RAKS-REEL7 uses an open-drain RESET output to enable wired-OR configuration with other supervisors or interrupt sources on a shared reset bus. This architecture requires an external pull-up resistor - typically 10 kΩ to 100 kΩ - connected between the RESET pin and the target logic rail (e.g., 3.3 V). The value is chosen to balance rise time, power consumption, and noise immunity per application requirements.
Can the ADM803RAKS-REEL7 replace the ADM809RAKSZ-REEL7 without hardware changes?
No - the ADM803RAKS-REEL7 cannot serve as a drop-in replacement for ADM809RAKSZ-REEL7 because it features an open-drain output requiring an external pull-up resistor, whereas ADM809RAKSZ-REEL7 has a push-pull output that drives both high and low actively. Substituting them would require adding the pull-up resistor and verifying timing margins, making it a board-level change rather than a direct replacement.
What is the power-on reset timeout duration of the ADM803RAKS-REEL7, and is it adjustable?
The ADM803RAKS-REEL7 provides a fixed 240 ms typical power-on reset timeout, with a guaranteed minimum of 140 ms and maximum of 460 ms over −40°C to +85°C. This delay is generated by an internal timer and is not user-adjustable; it is designed to exceed typical microprocessor initialization requirements without external components, ensuring deterministic system boot behavior across temperature and voltage conditions.
ADM803RAKS-REEL7 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:
- 2.63V
- Output:
- Open Drain or Open Collector
- 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
ADM803RAKS-REEL7 FAQ
1.How can I place an order for ADM803RAKS-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM803RAKS-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 ADM803RAKS-REEL7 reliable?
The price and inventory of ADM803RAKS-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM803RAKS-REEL7 is usually 5 days.
3.What payment methods are accepted for ADM803RAKS-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM803RAKS-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM803RAKS-REEL7?
ADM803RAKS-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM803RAKS-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 ADM803RAKS-REEL7?
For technical support, including ADM803RAKS-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM803RAKS-REEL7 requirements.
6.How does Aetrix verify that ADM803RAKS-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADM803RAKS-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 ADM803RAKS-REEL7 meets industry standards.
7.What is the process for return or replacement of ADM803RAKS-REEL7?
All ADM803RAKS-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM803RAKS-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 ADM803RAKS-REEL7 part is unused and in its original packaging.
Return procedure for ADM803RAKS-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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