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Analog Devices Inc. ADM803TAKS-REEL
- Part No.:
- ADM803TAKS-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
ADM803TAKS-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,607
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Product details
Overview
ADM803TAKS-REEL from Analog Devices is a 3-pin microprocessor supervisory circuit with open-drain active-low RESET output, 3.08 V reset threshold, and 240 ms power-on reset timeout. It operates down to 1.0 V VCC, consumes only 17 μA typical supply current, and is qualified for −40°C to +125°C industrial/automotive environments. It monitors 3.3 V supply rails in embedded controllers and portable instrumentation.
For engineers reviewing the ADM803TAKS-REEL datasheet, ADM803TAKS-REEL pinout, ADM803TAKS-REEL application, or ADM803TAKS-REEL equivalent, key selection criteria include reset threshold accuracy (±2.5% over temperature), open-drain output requiring external pull-up, SC70-3 package footprint, and guaranteed operation at VCC as low as 1 V during brownout.
Technical Context
The ADM803TAKS-REEL implements a precision bandgap voltage reference and comparator to monitor VCC against a fixed 3.08 V threshold. Its internal timer asserts RESET for 240 ms (typical) after VCC rises above threshold, ensuring stable microprocessor initialization.
It features built-in glitch immunity against fast VCC transients up to 100 V/μs and maintains valid reset assertion down to 1.0 V VCC - critical for detecting deep brownouts before system collapse. The open-drain output requires an external pull-up resistor for logic-level compatibility with diverse host interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08 V (±2.5% over −40°C to +125°C); precisely monitors 3.3 V supply rails with margin for tolerance and droop. |
| Supply Current | 17 μA typical at VCC < 3.6 V; enables use in battery-powered and ultra-low-power systems without compromising supervision integrity. |
| VCC Operating Range | 1.0 V to 5.5 V; ensures reliable reset assertion during severe brownout conditions where other supervisors fail. |
| Power-On Reset Timeout | 240 ms typical; holds microcontroller in reset long enough for clock stabilization and peripheral power sequencing. |
| Output Type | Open-drain active-low RESET; supports wired-OR configurations and flexible voltage-level translation via external pull-up. |
| Temperature Range | −40°C to +125°C; qualified for under-hood automotive, industrial PLC, and high-reliability embedded applications. |
| Package | 3-lead SC70 (KS-3); 2.0 mm × 2.1 mm footprint with 0.65 mm pitch - space-efficient for compact PCB layouts. |
Pinout & Package
ADM803TAKS-REEL uses a 3-lead SC70 (KS-3) package with exposed pad not electrically connected. Pin 1 = GND, Pin 2 = RESET (open-drain), Pin 3 = VCC. The small outline enables high-density placement while maintaining thermal performance (θJA = 146°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Common return path for internal reference and comparator; must be low-impedance connection to system ground plane. |
| RESET (Pin 2) | Open-drain active-low output | Sinks current when asserted; requires external pull-up resistor (typically 10 kΩ) to host logic rail (e.g., 3.3 V or 5 V). |
| VCC (Pin 3) | Monitored supply input | Connects directly to the 3.3 V rail being supervised; also powers internal circuitry - no separate bias supply needed. |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | 3.08 V ±2.5% over full temperature range - eliminates need for external trimming in 3.3 V systems. |
| Ultra-low quiescent current | 17 μA typical - extends battery life in portable instruments and reduces self-heating in sealed enclosures. |
| Brownout detection capability | Valid RESET assertion down to 1.0 V VCC - detects supply collapse earlier than 2.5 V or 2.7 V competitors. |
| Glitch-immune comparator | Immune to transients ≤100 V/μs on VCC - prevents false resets during switching noise or ESD events. |
| SC70-3 package | 2.0 mm × 2.1 mm footprint - saves >40% board area vs. SOT-23-3 while maintaining compatible reflow profile. |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
|
Use Scenario: Monitors 3.3 V microcontroller supply in programmable logic controllers exposed to wide ambient temperatures and electrical noise. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET during cold cranking (VCC dip to 1.8 V) and hot idle (125°C junction). Use Value: Prevents erratic firmware execution by guaranteeing 240 ms reset hold time even at 125°C and 1.0 V VCC - meeting IEC 61000-4-4 surge immunity requirements. |
Use Scenario: Ensures safe boot of body control MCU after vehicle ignition, where battery voltage may sag to 6 V during starter engagement. IC Role / Device Role / Timing Role: Voltage supervisor monitoring regulated 3.3 V domain; open-drain output interfaces directly to MCU's dedicated reset pin with 10 kΩ pull-up to 3.3 V. Use Value: 3.08 V threshold provides optimal margin above 3.3 V rail's ±5% tolerance, avoiding premature reset release during transient load steps. |
| Portable Medical Instrument | Smart Energy Meter |
|
Use Scenario: Powers on/off sequence control in handheld glucose meters using coin-cell batteries with steep discharge curves. IC Role / Device Role / Timing Role: Resets the ARM Cortex-M0+ MCU when VCC falls below 3.08 V during battery depletion, preventing corrupted EEPROM writes. Use Value: 17 μA supply current minimizes standby drain; 1.0 V operation allows final reset assertion even as battery drops to 1.2 V under load - maximizing usable capacity. |
Use Scenario: Supervises metrology SoC in DIN-rail mounted electricity meters operating continuously at 85°C ambient. IC Role / Device Role / Timing Role: Provides temperature-stable reset signal to ensure accurate ADC calibration startup after power restoration. Use Value: ±2.5% threshold accuracy over −40°C to +125°C eliminates recalibration drift; SC70 package enables placement near heat-generating isolation transformers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TTRD+T | 3.08 V threshold, push-pull output, SOT-23-3 package, 20 μA supply current | Requires no external pull-up; less suitable for wired-OR reset buses or mixed-voltage systems | Select when board layout lacks space for pull-up resistor or host MCU accepts push-pull reset input. |
| TPS3808G30DBVR | 3.0 V threshold (±0.5%), adjustable delay, SOT-23-6 package, 1.1 μA quiescent current | Higher accuracy but larger footprint; delay programmable via capacitor - adds BOM and layout complexity | Select when sub-1% threshold tolerance is mandatory and board area permits 6-pin package. |
Compared with MAX809TTRD+T and TPS3808G30DBVR, the ADM803TAKS-REEL offers the smallest footprint (SC70-3), lowest cost for open-drain flexibility, and proven robustness in high-temperature automotive deployments - making it optimal for space-constrained, multi-rail, or legacy-compatible designs.
Availability
ADM803TAKS-REEL is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and portable medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM803TAKS-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, Inc. 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' precision supervisory IC product line, engineered specifically for reliable power-on reset and brownout protection in harsh-environment microprocessor systems where supply stability cannot be assumed.
FAQ
What is the exact reset threshold voltage of the ADM803TAKS-REEL and how does it vary with temperature?
The ADM803TAKS-REEL has a nominal reset threshold of 3.08 V, with guaranteed limits of 3.00 V to 3.15 V over −40°C to +85°C and 2.95 V to 3.21 V over −40°C to +125°C. This ±2.5% variation ensures precise supervision of 3.3 V rails across automotive and industrial operating conditions without external calibration. The ADM803TAKS-REEL maintains this specification using a trimmed bandgap reference with 30 ppm/°C temperature coefficient.
Does the ADM803TAKS-REEL require an external pull-up resistor on the RESET pin, and what value is recommended?
Yes, the ADM803TAKS-REEL features an open-drain RESET output and requires an external pull-up resistor. A 10 kΩ resistor to the host logic supply (e.g., 3.3 V or 5 V) is recommended per Analog Devices' application guidance. This ensures proper logic-high level when RESET is deasserted and limits sink current to <1.2 mA during assertion - within the ADM803TAKS-REEL's specified 0.3 V low-level output voltage at 1.2 mA.
Can the ADM803TAKS-REEL operate reliably during severe brownout conditions where VCC drops below 2.0 V?
Yes, the ADM803TAKS-REEL guarantees valid RESET assertion down to 1.0 V VCC - significantly lower than most competing supervisors. At VCC = 1.2 V, it still sinks ≥50 μA while holding RESET low at ≤0.3 V, enabling clean shutdown sequencing in battery-powered devices. This capability is confirmed in the datasheet's "RESET OUTPUT VOLTAGE LOW" specifications and validated across the full −40°C to +125°C temperature range.
What is the power-on reset timeout duration of the ADM803TAKS-REEL, and is it adjustable?
The ADM803TAKS-REEL provides a fixed 240 ms typical power-on reset timeout after VCC rises above the 3.08 V threshold. This duration is factory-trimmed and non-adjustable - ensuring consistent, predictable reset timing without external components. The datasheet specifies a minimum of 140 ms and maximum of 460 ms over −40°C to +85°C, providing design margin for worst-case oscillator start-up and memory initialization delays in microcontrollers.
How does the SC70-3 package of the ADM803TAKS-REEL compare to SOT-23-3 in terms of board area and thermal performance?
The ADM803TAKS-REEL's SC70-3 (KS-3) package measures 2.0 mm × 2.1 mm - approximately 40% smaller than the standard SOT-23-3 (RT-3) footprint of 2.9 mm × 1.3 mm. Its thermal impedance is 146°C/W (θJA), notably lower than SOT-23-3's 270°C/W, due to improved die-to-pad conduction. This makes the ADM803TAKS-REEL better suited for thermally dense layouts and high-ambient applications where self-heating must be minimized.
ADM803TAKS-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:
- 3.08V
- 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
ADM803TAKS-REEL FAQ
1.How can I place an order for ADM803TAKS-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM803TAKS-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 ADM803TAKS-REEL reliable?
The price and inventory of ADM803TAKS-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM803TAKS-REEL is usually 5 days.
3.What payment methods are accepted for ADM803TAKS-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM803TAKS-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM803TAKS-REEL?
ADM803TAKS-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM803TAKS-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 ADM803TAKS-REEL?
For technical support, including ADM803TAKS-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM803TAKS-REEL requirements.
6.How does Aetrix verify that ADM803TAKS-REEL is sourced from the original manufacturer or authorized distributors?
All ADM803TAKS-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 ADM803TAKS-REEL meets industry standards.
7.What is the process for return or replacement of ADM803TAKS-REEL?
All ADM803TAKS-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM803TAKS-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 ADM803TAKS-REEL part is unused and in its original packaging.
Return procedure for ADM803TAKS-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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