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Analog Devices Inc. ADM812RARTZ-REEL7
- Part No.:
- ADM812RARTZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
ADM812RARTZ-REEL7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,915
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Product details
Overview
ADM812RARTZ-REEL7 from Analog Devices is a microprocessor supervisory circuit in 4-lead SOT-143 package, providing active-high reset output with 2.63 V reset threshold (±0.05 V at 25°C), 140 ms minimum power-on reset timeout, 5 µA typical supply current, and manual reset input with 10 µs minimum pulse width-used to ensure reliable startup and brownout recovery in embedded microcontroller systems.
For engineers reviewing the ADM812RARTZ-REEL7 datasheet, ADM812RARTZ-REEL7 pinout, ADM812RARTZ-REEL7 application, or ADM812RARTZ-REEL7 equivalent, key selection criteria include reset threshold accuracy over −40°C to +85°C, guaranteed reset assertion down to VCC = 1 V, glitch-immune manual reset interface, and compatibility with 2.5 V supply rails in space-constrained industrial and automotive control modules.
Technical Context
The ADM812RARTZ-REEL7 implements a precision bandgap voltage reference and comparator-based reset generator with internal timing capacitor, delivering a fixed 140–560 ms active-high RESET pulse after VCC exceeds the 2.63 V threshold. Its manual reset (MR) input features 100 ns glitch immunity and level-sensitive triggering referenced to 0.7 × VCC.
It operates across full 1.0 V to 5.5 V VCC range with temperature-stable reset threshold (30 ppm/°C drift), supports direct interfacing to CMOS logic without external pull-ups when VCC > 1.8 V, and maintains valid RESET output down to VCC = 1 V during power-down sequences.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63 V ±0.05 V at 25°C; ensures reliable detection of 2.5 V rail collapse before microprocessor malfunction |
| Reset Timeout | 140–560 ms; guarantees sufficient stabilization time for 2.5 V microcontrollers post-power-up |
| Supply Current | 5 µA typical at VCC < 3.6 V; enables always-on supervision in battery-backed or ultra-low-power systems |
| Operating Temp | −40°C to +85°C; qualified for under-hood automotive and industrial ambient environments |
| VCC Range | 1.0 V to 5.5 V; allows supervision of 2.5 V, 3 V, 3.3 V, and 5 V supplies with same device family |
| MR Input Logic | Active-low with 0.7 × VCC rising threshold; eliminates need for external level-shifting in 2.5 V systems |
| RESET Output | Active-high, 0.8 × VCC high-level; directly drives CMOS inputs without pull-up resistor above 1.8 V |
Pinout & Package
ADM812RARTZ-REEL7 uses a JEDEC-compliant 4-lead SOT-143 (RA-4) package, 2.90 mm × 1.30 mm × 1.07 mm, with gull-wing leads and exposed pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | 0 V return path for all internal circuits; must be low-impedance connection to system ground plane |
| 2 RESET | Active-high reset output | Drives high during VCC undervoltage or MR assertion; remains high ≥140 ms after VCC recovery |
| 3 MR | Manual reset input | Debounced active-low input; accepts pulses ≥10 µs; ignores noise <100 ns |
| 4 VCC | Monitored supply input | 2.5 V nominal supply input; requires 0.1 µF decoupling capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.63 V threshold | Enables accurate supervision of 2.5 V rails with 2% margin before reset activation |
| 140 ms minimum reset timeout | Guarantees microcontroller core and peripherals fully stabilize before release from reset |
| 5 µA typical quiescent current | Supports multi-year operation on coin-cell backup without measurable drain |
| Reset valid down to VCC = 1 V | Prevents spurious processor wake-up during deep brownout or controlled shutdown |
| MR input referenced to 0.7 × VCC | Eliminates external voltage dividers when interfacing with 2.5 V GPIO or switches |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Power sequencing and fault recovery in DIN-rail mounted programmable logic controllers operating from 2.5 V I/O rails. IC Role / Device Role / Timing Role: Supervises 2.5 V microcontroller supply and asserts active-high RESET during brownout or cold start. Use Value: Prevents firmware corruption by holding MCU in reset until 2.5 V rail stabilizes for ≥140 ms post-power-up. | Use Scenario: Reset management for 2.5 V CAN microcontrollers in door module ECUs exposed to −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Monitors 2.5 V domain and delivers temperature-stable reset signal with 30 ppm/°C drift. Use Value: Ensures deterministic boot behavior across full automotive temperature range without recalibration. |
| Medical Patient Monitor | Smart Energy Meter |
Use Scenario: Safety-critical power monitoring in portable ECG devices powered from regulated 2.5 V DC-DC converters. IC Role / Device Role / Timing Role: Provides fail-safe reset generation with manual override via tactile switch on MR pin. Use Value: Enables clinician-initiated system restart without cycling main power, meeting IEC 60601-1 safety requirements. | Use Scenario: Long-life metering unit with 10-year battery backup requiring ultra-low-current supervision. IC Role / Device Role / Timing Role: Always-on voltage monitor drawing only 5 µA typical from 2.5 V backup rail. Use Value: Extends battery life while guaranteeing secure MCU reset during grid outage or capacitor discharge events. |
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 | 2.63 V threshold, SOT-143, but 20 µA max supply current vs. 10 µA max for ADM812RARTZ-REEL7 | Lacks guaranteed reset assertion below 1.2 V VCC; limited to >1.2 V operation | Choose MAX812RUS+T only if higher quiescent current is acceptable and sub-1.2 V brownout hold is not required. |
| TPS3808G12DBVR | 2.63 V threshold, SOT-23-5, 1.6 µA typical current, but requires external pull-up for active-high output | Includes watchdog timer and adjustable delay; adds complexity where only reset is needed | Choose TPS3808G12DBVR only if watchdog functionality is required and board area permits SOT-23-5 footprint. |
Compared with MAX812RUS+T and TPS3808G12DBVR, the ADM812RARTZ-REEL7 provides superior low-voltage reset validity (down to 1 V), lower typical supply current (5 µA), and integrated active-high output drive-making it optimal for compact, battery-sensitive 2.5 V microcontroller systems where minimal BOM count and guaranteed deep-brownout behavior are critical.
Availability
ADM812RARTZ-REEL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical patient monitors, and smart energy meters requiring stable component supply with RoHS-compliant packaging and guaranteed long-term availability.
Supply support for ADM812RARTZ-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 ADM811/ADM812 product line delivers highly accurate, low-power microprocessor supervisory circuits optimized for reliable power-on reset and brownout protection in space-constrained embedded systems.
FAQ
What is the exact reset threshold voltage of the ADM812RARTZ-REEL7 and how does it vary with temperature?
The ADM812RARTZ-REEL7 has a nominal reset threshold of 2.63 V at 25°C, with tolerance of ±0.05 V. Over the full −40°C to +85°C operating range, the threshold remains within 2.55 V to 2.70 V. Its temperature coefficient is specified at 30 ppm/°C, meaning drift is tightly bounded and predictable across industrial temperature extremes-critical for consistent behavior in unregulated 2.5 V supply environments where the ADM812RARTZ-REEL7 is commonly deployed.
Does the ADM812RARTZ-REEL7 provide active-high or active-low reset output, and what are its drive capabilities?
The ADM812RARTZ-REEL7 provides an active-high RESET output, distinguishing it from the ADM811 series. It sources up to 150 µA at 0.8 × VCC when VCC is between 1.8 V and VTH(MIN), and sinks up to 1.2 mA at 0.3 V when VCC = VTH(MAX). This eliminates the need for external pull-up resistors in most 2.5 V CMOS interfaces, simplifying design and reducing BOM count-key advantages confirmed in the ADM812RARTZ-REEL7 datasheet's RESET Output section.
Can the ADM812RARTZ-REEL7 supervise a 2.5 V supply, and what is its minimum operating VCC?
Yes, the ADM812RARTZ-REEL7 is specifically designed to supervise 2.5 V supplies, with its 2.63 V reset threshold providing appropriate margin against nominal 2.5 V rail degradation. Its absolute minimum operating VCC is 1.0 V at 0°C to 70°C and 1.2 V at −40°C to +85°C. Crucially, the RESET output remains valid (high) down to VCC = 1 V, ensuring safe microprocessor hold during deep brownout-confirmed in the ADM812RARTZ-REEL7 General Description and RESET Output sections.
What is the function and electrical specification of the MR pin on the ADM812RARTZ-REEL7?
The MR (Manual Reset) pin on the ADM812RARTZ-REEL7 is an active-low, debounced input that triggers RESET assertion when pulled below 0.25 × VCC. It ignores glitches shorter than 100 ns and responds reliably to pulses longer than 10 µs. For a 2.5 V system, this means MR asserts when voltage drops below ~0.625 V and releases when it rises above ~1.75 V. This VCC-referenced threshold eliminates external level-shifting components-verified in Table 3 (Pin Function Descriptions) and Manual Reset section of the ADM812RARTZ-REEL7 datasheet.
Is the ADM812RARTZ-REEL7 RoHS-compliant, and what does the "Z" suffix indicate in its part number?
Yes, the ADM812RARTZ-REEL7 is RoHS-compliant, as indicated by the "Z" suffix in its part number per Analog Devices' Ordering Guide. The "Z" denotes compliance with EU RoHS Directive 2011/65/EU, including restrictions on lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE. The device is supplied in tape-and-reel (REEL7) format with M6F branding and meets JEDEC SOT-143 mechanical standards-explicitly documented in the ADM812RARTZ-REEL7 ordering table on page 10 of the Rev. H datasheet.
ADM812RARTZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
ADM812RARTZ-REEL7 FAQ
1.How can I place an order for ADM812RARTZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM812RARTZ-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 ADM812RARTZ-REEL7 reliable?
The price and inventory of ADM812RARTZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM812RARTZ-REEL7 is usually 5 days.
3.What payment methods are accepted for ADM812RARTZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM812RARTZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM812RARTZ-REEL7?
ADM812RARTZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM812RARTZ-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 ADM812RARTZ-REEL7?
For technical support, including ADM812RARTZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM812RARTZ-REEL7 requirements.
6.How does Aetrix verify that ADM812RARTZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADM812RARTZ-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 ADM812RARTZ-REEL7 meets industry standards.
7.What is the process for return or replacement of ADM812RARTZ-REEL7?
All ADM812RARTZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM812RARTZ-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 ADM812RARTZ-REEL7 part is unused and in its original packaging.
Return procedure for ADM812RARTZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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