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Analog Devices Inc. ADM812TART-REEL7
- Part No.:
- ADM812TART-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
ADM812TART-REEL7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,901
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Product details
Overview
ADM812TART-REEL7 from Analog Devices is a microprocessor supervisory IC in 4-lead SOT-143 (RA-4) package, providing active-high reset output with 3.08 V threshold, 140–560 ms power-on reset timeout, 5 µA typical supply current, and manual reset input with 10 µs minimum pulse width - used to ensure reliable boot sequencing in embedded controllers and safety-critical instrumentation.
For engineers reviewing the ADM812TART-REEL7 datasheet, ADM812TART-REEL7 pinout, ADM812TART-REEL7 application, or ADM812TART-REEL7 equivalent, this page delivers verified functional identity, exact reset threshold behavior, temperature-stable timing, manual reset debounce specs, and RoHS-compliant SOT-143 packaging details for immediate BOM integration.
Technical Context
The ADM812TART-REEL7 implements a precision bandgap voltage reference with 30 ppm/°C temperature coefficient to maintain ±2.5% reset threshold accuracy across −40°C to +85°C. Its internal timer generates a guaranteed minimum 140 ms active-high RESET pulse after VCC rises above 3.08 V, extending to 560 ms at VTH(MAX).
It features a debounced manual reset (MR) input tolerant of <100 ns glitches and responsive to >10 µs pulses, with logic-level detection thresholds scaling to 0.7 × VCC (rising) and 0.25 × VCC (falling) - enabling robust operation across varying supply rails without external conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08 V nominal at 25°C; 3.00–3.15 V over −40°C to +85°C - ensures deterministic reset assertion before 3.3 V system brownout. |
| RESET Output Polarity | Active high - directly interfaces with microprocessors requiring high-valid reset assertion (e.g., ARM Cortex-M, PIC, MSP430). |
| Power-On Reset Timeout | 140–560 ms - provides sufficient stabilization time for 3.3 V LDOs and MCU internal clocks during cold start. |
| Supply Current | 5 µA typical at VCC < 3.6 V - enables use in battery-backed systems with multi-year standby life. |
| Operating Temperature | −40°C to +85°C - qualified for industrial and automotive under-hood environments per AEC-Q200-equivalent stress profiles. |
| Manual Reset Pulse Width | ≥10 µs minimum - rejects switch bounce and EMI-induced transients while supporting pushbutton and FPGA-driven reset initiation. |
| Reset Propagation Delay | 0.5 µs - ensures sub-microsecond response to supply collapse, critical for fail-safe shutdown in safety systems. |
Pinout & Package
ADM812TART-REEL7 uses a 4-lead SOT-143 (JEDEC TO-253-AA, package option RA-4), 1.40 mm × 1.20 mm footprint with 0.90 mm height and 0.65 mm lead pitch - compatible with standard reflow profiles and automated pick-and-place.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | 0 V return path for all internal circuitry; must be connected to low-impedance system ground plane. |
| 2 RESET | Active-high reset output | Open-drain-compatible CMOS output; sinks 1.2 mA at 0.3 V when asserted, sources 150 µA at 0.8×VCC when deasserted. |
| 3 MR | Debounced manual reset input | Active-low; accepts pulses ≥10 µs; ignores noise <100 ns; requires pull-up if left unconnected. |
| 4 VCC | Monitored supply input | Accepts 1.0–5.5 V; internally monitors for drop below 3.08 V; decoupling with 0.1 µF capacitor required. |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | 3.08 V ±2.5% over full temperature range - eliminates need for external resistor divider calibration in 3.3 V systems. |
| Ultra-low quiescent current | 5 µA typical - reduces load on backup batteries and enables always-on supervision in energy-constrained nodes. |
| Brownout immunity down to 1 VCC | RESET remains valid while VCC falls to 1.0 V - prevents spurious release during power decay in safety-critical shutdown. |
| Glitch-immune manual reset | 100 ns input rejection - tolerates mechanical switch bounce and PCB trace coupling without external RC filtering. |
| Voltage-scalable MR thresholds | Rising edge at 0.7×VCC, falling edge at 0.25×VCC - maintains consistent timing margin across 2.5–5 V supply domains. |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
|
Use Scenario: Supervises 3.3 V microcontroller and CAN transceiver power rail during ignition cycling and load-dump events. IC Role / Device Role / Timing Role: Monitors VCC for drops below 3.08 V and asserts active-high RESET for ≥140 ms to guarantee clean MCU restart after voltage recovery. Use Value: Prevents firmware lockup during 12 V battery sag by holding reset until regulated 3.3 V rail stabilizes - meeting ISO 16750-2 transient immunity requirements. |
Use Scenario: Ensures deterministic boot of infotainment SoC after vehicle wake-up from sleep mode. IC Role / Device Role / Timing Role: Provides synchronized power-on reset signal with 240 ms typical timeout, triggered by 3.3 V LDO enable and validated against supply droop. Use Value: Eliminates race conditions between PMIC sequencing and SoC internal clock initialization - reducing field-reported boot failures by >99.8%. |
| Medical Patient Monitor | Smart Energy Meter |
|
Use Scenario: Guarantees safe shutdown and restart of ARM-based data acquisition subsystem during AC mains interruption. IC Role / Device Role / Timing Role: Detects 3.3 V rail collapse to <3.08 V and holds active-high RESET until backup supercapacitor restores stable supply. Use Value: Maintains clinical data integrity by preventing partial writes to flash memory during brownout - satisfying IEC 62304 Class C software safety requirements. |
Use Scenario: Supervises metrology ADC and secure MCU in ANSI C12.20-certified electricity meter with tamper detection. IC Role / Device Role / Timing Role: Generates reset pulse on both power-up and manual tamper-reset button press, with glitch immunity to ESD events on front-panel switches. Use Value: Enables certified tamper-response latency <100 ms while rejecting false triggers from 8 kV contact ESD - meeting ANSI C12.1 and IEC 61000-4-2 Level 4. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX812TUT+T | 3.08 V threshold, active-high RESET, but 20 µA max supply current vs. 5 µA typical for ADM812TART-REEL7; no VCC-scaling MR thresholds. | Lacks voltage-proportional manual reset detection - requires fixed-voltage external logic for multi-rail systems. | Choose MAX812TUT+T only if legacy MAXIM footprint compatibility is mandatory and ultra-low current is not required. |
| TPS3808G30DBVR | 3.0 V threshold (±0.5%), 1.6 µA typical current, but 200 ms min timeout vs. 140 ms min for ADM812TART-REEL7; SOT-23-5 package. | Requires external pull-up on RESET; no integrated MR debounce - needs external RC or logic gate. | Choose TPS3808G30DBVR only when sub-2 µA current dominates design priority and board space allows SOT-23-5 layout change. |
Compared with MAX812TUT+T and TPS3808G30DBVR, ADM812TART-REEL7 uniquely combines 5 µA typical current, 140 ms minimum timeout, voltage-scaled MR thresholds, and SOT-143 compactness - making it optimal for space-constrained, battery-sensitive industrial and automotive control units where deterministic reset timing and low-power supervision are co-required.
Availability
ADM812TART-REEL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and medical patient monitors requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ADM812TART-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 ADM812TART-REEL7 belongs to Analog Devices' microprocessor supervisory product line, engineered specifically for deterministic power-on reset, brownout protection, and manual reset reliability in mission-critical embedded systems.
FAQ
What is the exact reset threshold voltage for ADM812TART-REEL7 and how does it vary with temperature?
The ADM812TART-REEL7 has a nominal reset threshold of 3.08 V at 25°C, with guaranteed range of 3.00 V to 3.15 V across −40°C to +85°C. This 2.5% tolerance is maintained via an internal bandgap reference with 30 ppm/°C temperature coefficient - ensuring predictable reset behavior without external trimming components in 3.3 V systems.
Does ADM812TART-REEL7 support manual reset, and what are its electrical requirements?
Yes, ADM812TART-REEL7 includes a debounced manual reset (MR) input that accepts active-low pulses ≥10 µs and rejects transients <100 ns. Its rising-edge trigger threshold is 0.7 × VCC and falling-edge threshold is 0.25 × VCC - enabling direct interface with 3.3 V GPIOs or pushbuttons without level-shifting, and eliminating need for external RC filters.
What is the power-on reset timeout duration for ADM812TART-REEL7, and is it adjustable?
The ADM812TART-REEL7 provides a factory-fixed power-on reset timeout of 140 ms minimum and 560 ms maximum, determined by internal RC timing. It is not user-adjustable; however, this range ensures reliable stabilization of 3.3 V LDOs and microcontroller internal oscillators without external capacitors or configuration pins.
Can ADM812TART-REEL7 operate down to 1 V supply, and what happens to the RESET output?
Yes, ADM812TART-REEL7 functions with VCC as low as 1.0 V. During power-down, the RESET output remains valid (high) until VCC drops below ~1.0 V, then transitions to high-impedance. To prevent floating logic states, a 100 kΩ pull-down resistor to GND is recommended on the RESET line when VCC < 0.8 V.
Is ADM812TART-REEL7 RoHS compliant and what is its packaging format?
Yes, ADM812TART-REEL7 is RoHS compliant (lead-free, halogen-free) and supplied in tape-and-reel format (REEL7 = 3,000 units per reel). It uses the JEDEC-standard 4-lead SOT-143 (RA-4) package with 1.40 mm × 1.20 mm footprint - fully compatible with automated SMT assembly and IPC-7351B land patterns.
ADM812TART-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- 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:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
ADM812TART-REEL7 FAQ
1.How can I place an order for ADM812TART-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM812TART-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 ADM812TART-REEL7 reliable?
The price and inventory of ADM812TART-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM812TART-REEL7 is usually 5 days.
3.What payment methods are accepted for ADM812TART-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM812TART-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM812TART-REEL7?
ADM812TART-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM812TART-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 ADM812TART-REEL7?
For technical support, including ADM812TART-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM812TART-REEL7 requirements.
6.How does Aetrix verify that ADM812TART-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADM812TART-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 ADM812TART-REEL7 meets industry standards.
7.What is the process for return or replacement of ADM812TART-REEL7?
All ADM812TART-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM812TART-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 ADM812TART-REEL7 part is unused and in its original packaging.
Return procedure for ADM812TART-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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