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Analog Devices Inc. ADM812RART-REEL7
- Part No.:
- ADM812RART-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
ADM812RART-REEL7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:4,290
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Product details
Overview
ADM812RART-REEL7 from Analog Devices is a microprocessor supervisory circuit in 4-lead SOT-143 (RA-4) package, providing active-high reset output with 2.63 V reset threshold, 140 ms minimum power-on reset timeout, 5 µA typical supply current, and −40°C to +85°C operating temperature range. It monitors 2.5 V supply rails in embedded controllers and safety-critical instrumentation.
For engineers reviewing the ADM812RART-REEL7 datasheet, ADM812RART-REEL7 pinout, ADM812RART-REEL7 application, or ADM812RART-REEL7 equivalent, key selection criteria include reset threshold accuracy (±0.05 V at 25°C), manual reset debounce timing (10 µs min pulse width), glitch immunity (100 ns rejection), and guaranteed RESET assertion down to VCC = 1 V.
Technical Context
The ADM812RART-REEL7 implements a precision bandgap voltage reference with 30 ppm/°C temperature coefficient to generate a stable 2.63 V reset threshold across −40°C to +85°C. Its internal timer ensures 140–560 ms reset timeout after VCC rise above threshold, with propagation delay under 0.5 µs.
It features a debounced manual reset input (MR) that accepts pulses >10 µs and rejects transients <100 ns, and its active-high RESET output sources 150 µA at 0.8 × VCC when VCC > VTH(MAX), enabling direct interface with 2.5 V/3.3 V logic without external pull-ups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63 V (typical at 25°C); ±0.05 V tolerance over full temp range ensures reliable 2.5 V rail monitoring |
| Reset Timeout | 140–560 ms; guarantees sufficient stabilization time for microprocessors during power-up or brownout recovery |
| Supply Current | 5 µA typical; enables ultra-low-power operation in battery-backed or energy-constrained systems |
| Operating Temp | −40°C to +85°C; qualified for industrial and automotive under-hood environments |
| Reset Output Type | Active-high; eliminates need for external inverter when interfacing with processors requiring high-active reset |
| Manual Reset Pulse | ≥10 µs width required; robust against switch bounce and EMI in noisy control panels |
| Glitch Immunity | Rejects <100 ns transients; prevents false resets from power supply noise or digital coupling |
Pinout & Package
ADM812RART-REEL7 uses a 4-lead SOT-143 (RA-4) package per JEDEC TO-253-AA, with 1.92 mm body width, 1.40 mm height, and 0.90 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground Reference | 0 V return path for all internal circuits; must be connected directly to system ground plane |
| 2 (RESET) | Active-High Reset Output | Drives high during reset condition (VCC < 2.63 V or MR low); remains high ≥140 ms after VCC recovery |
| 3 (MR) | Manual Reset Input | Active-low debounced input; requires ≥10 µs low pulse to trigger reset; floats high when unused |
| 4 (VCC) | Monitored Supply Input | Accepts 1.0–5.5 V; powers device and provides reference for threshold detection; requires 0.1 µF decoupling to GND |
Key Features
| Feature | Design Value |
|---|---|
| Precision Voltage Monitoring | 2.63 V threshold with ±0.05 V max deviation over −40°C to +85°C enables accurate 2.5 V rail supervision |
| Low-Power Operation | 5 µA typical supply current extends battery life in portable instruments and remote sensors |
| Guaranteed Reset Assertion Down to VCC = 1 V | Ensures processor remains held in reset during deep brownout, preventing erratic execution during power collapse |
| Debounced Manual Reset | Hardware-level filtering rejects contact bounce and EMI, eliminating need for firmware debounce routines |
| Direct Logic Compatibility | RESET output sources 150 µA at 0.8 × VCC, allowing direct connection to 2.5 V/3.3 V CMOS inputs without pull-up resistors |
Applications
| Industrial PLC Controllers | Automotive Body Control Modules |
|---|---|
Use Scenario: Supervising 2.5 V I/O supply in programmable logic controller backplanes subject to voltage sag during relay switching. IC Role / Device Role / Timing Role: Microprocessor supervisory circuit asserting active-high reset to halt CPU execution until 2.5 V rail stabilizes post-sag. Use Value: Prevents corrupted register writes and firmware lockup during transient undervoltage events common in industrial power distribution. | Use Scenario: Monitoring 2.5 V sensor interface rail in vehicle door module exposed to load dump and cold crank conditions. IC Role / Device Role / Timing Role: Voltage monitor generating 140 ms minimum reset pulse to ensure MCU reinitialization after battery voltage recovery. Use Value: Eliminates need for external RC timing network while maintaining AEC-Q100-compliant reset timing stability across temperature. |
| Medical Patient Monitor Front-End | Smart Energy Metering Units |
Use Scenario: Securing 2.5 V analog front-end supply in portable ECG devices where power integrity affects diagnostic accuracy. IC Role / Device Role / Timing Role: Supervisory IC holding system in reset during battery swap or low-battery cutoff to preserve calibration state. Use Value: 5 µA quiescent current minimizes standby drain; guaranteed reset down to VCC = 1 V prevents partial initialization during battery depletion. | Use Scenario: Supervising isolated 2.5 V DC-DC output powering metrology ADC and real-time clock in utility meters. IC Role / Device Role / Timing Role: Precision reset generator ensuring deterministic boot sequence after grid interruption or capacitor discharge. Use Value: 30 ppm/°C threshold drift maintains reset accuracy across wide ambient ranges (−25°C to +70°C) without software compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX812RUS+T | Same 2.63 V threshold and SOT-143 package but higher 10 µA typical supply current; no guaranteed reset below 1.2 V | Lacks deep brownout reset assertion; less suitable for battery-powered systems requiring reset hold-down to 1 V | Select only if MAXIM sourcing preference exists and deep brownout behavior is not required |
| TPS3808G12DBVR | 2.63 V threshold in SOT-23-5; 1.6 µA typical current; fixed 200 ms timeout; supports watchdog function | Requires PCB redesign (5-pin vs. 4-pin); adds watchdog capability not present in ADM812RART-REEL7 | Choose when watchdog timer integration justifies layout change and lower quiescent current is critical |
Compared with MAX812RUS+T and TPS3808G12DBVR, the ADM812RART-REEL7 uniquely combines ultra-low 5 µA supply current, guaranteed reset assertion down to VCC = 1 V, and 4-pin SOT-143 simplicity-making it optimal for space-constrained, battery-sensitive 2.5 V rail supervision where minimal BOM count and deep brownout reliability are essential.
Availability
ADM812RART-REEL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and medical patient monitor front-ends requiring stable component supply with guaranteed long-term availability.
Supply support for ADM812RART-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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The ADM812 series belongs to Analog Devices' microprocessor supervisory product line, designed specifically for reliable power-on and brownout reset generation in resource-constrained embedded systems with strict quiescent current and timing requirements.
FAQ
What is the exact reset threshold voltage of the ADM812RART-REEL7 and how does it vary with temperature?
The ADM812RART-REEL7 has a nominal reset threshold of 2.63 V at 25°C, with a guaranteed range of 2.55 V to 2.70 V across −40°C to +85°C. Its temperature coefficient is 30 ppm/°C, resulting in ≤0.2% total drift over the full operating range-enabling precise 2.5 V rail supervision without calibration.
Does the ADM812RART-REEL7 provide active-high or active-low reset output, and what are the drive capabilities?
The ADM812RART-REEL7 provides an active-high RESET output. When VCC > VTH(MAX), it sources 150 µA at 0.8 × VCC into a high-impedance load. At VCC = 2.5 V, this delivers ≥2.0 V output, ensuring compatibility with standard 2.5 V CMOS logic inputs without external pull-up resistors.
What is the minimum manual reset pulse width required to trigger reset on the ADM812RART-REEL7?
The ADM812RART-REEL7 requires a minimum manual reset (MR) pulse width of 10 µs to guarantee recognition. Its internal debounce circuit rejects transients shorter than 100 ns, making it immune to switch bounce and EMI-induced glitches in industrial control panels and automotive environments.
Can the ADM812RART-REEL7 operate reliably during deep supply voltage brownouts?
Yes-the ADM812RART-REEL7 asserts RESET down to VCC = 1 V, ensuring the microprocessor remains held in reset even during severe brownouts. This behavior is guaranteed across temperature and eliminates risk of spurious execution or memory corruption during power collapse.
What package type and footprint does the ADM812RART-REEL7 use, and are there any layout recommendations?
The ADM812RART-REEL7 uses a 4-lead SOT-143 (RA-4) package compliant with JEDEC TO-253-AA. A 0.1 µF ceramic decoupling capacitor must be placed between VCC and GND pins, with short traces and direct connection to ground plane to maintain noise immunity and reset timing accuracy.
ADM812RART-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:
- 2.63V
- 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
ADM812RART-REEL7 FAQ
1.How can I place an order for ADM812RART-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM812RART-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 ADM812RART-REEL7 reliable?
The price and inventory of ADM812RART-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM812RART-REEL7 is usually 5 days.
3.What payment methods are accepted for ADM812RART-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM812RART-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM812RART-REEL7?
ADM812RART-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM812RART-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 ADM812RART-REEL7?
For technical support, including ADM812RART-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM812RART-REEL7 requirements.
6.How does Aetrix verify that ADM812RART-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADM812RART-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 ADM812RART-REEL7 meets industry standards.
7.What is the process for return or replacement of ADM812RART-REEL7?
All ADM812RART-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM812RART-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 ADM812RART-REEL7 part is unused and in its original packaging.
Return procedure for ADM812RART-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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