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Analog Devices Inc. ADM812ZART-REEL
- Part No.:
- ADM812ZART-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
ADM812ZART-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:20,000
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Product details
Overview
ADM812ZART-REEL from Analog Devices is a microprocessor supervisory circuit in 4-lead SOT-143 (RA-4) package, providing active-high reset output with 2.32 V reset threshold, 140 ms minimum power-on reset timeout, 5 µA typical supply current, and operation down to VCC = 1.2 V over −40°C to +85°C. It monitors 2.5 V supply rails in embedded controllers and portable instrumentation.
For engineers reviewing the ADM812ZART-REEL datasheet, ADM812ZART-REEL pinout, ADM812ZART-REEL application, or ADM812ZART-REEL equivalent, this page delivers verified functional role, precise voltage monitoring specs, manual reset timing behavior, thermal stability data, and RoHS-compliant sourcing details for industrial and automotive system design.
Technical Context
The ADM812ZART-REEL integrates a precision bandgap reference, debounced manual reset input (MR), and temperature-compensated reset generator with 30 ppm/°C threshold drift. Its internal timer ensures 240 ms typical reset assertion after VCC rise above 2.32 V.
It features glitch-immune MR detection (100 ns rejection), 20 µs VCC-to-RESET propagation delay at low supply voltages, and guaranteed RESET high-level output of 0.8 × VCC when VCC > VTH(MAX), enabling direct interface with 2.5 V logic without external level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.32 V nominal (2.25 V to 2.38 V over −40°C to +85°C); enables reliable supervision of 2.5 V systems with 10% tolerance margin. |
| Reset Output Polarity | Active-high (RESET); directly drives CMOS inputs requiring asserted-high reset signal without pull-up resistor. |
| Power-On Reset Timeout | 140 ms minimum; ensures microprocessor stabilization before release from reset during cold start. |
| Supply Current | 5 µA typical at VCC < 3.6 V; supports ultra-low-power battery-backed applications and always-on monitoring. |
| Operating Temperature | −40°C to +85°C; qualified for industrial and automotive under-hood environments without derating. |
| VCC Range | 1.2 V to 5.5 V; maintains valid RESET output down to 1.2 V, preventing spurious release during brownout recovery. |
| Manual Reset Pulse Width | 10 µs minimum; tolerates mechanical switch bounce and long PCB trace noise in field-deployed systems. |
Pinout & Package
ADM812ZART-REEL uses a 4-lead SOT-143 (JEDEC TO-253-AA, package option RA-4) with 1.92 mm × 1.40 mm footprint and 0.95 mm height. Pin 1 is GND, Pin 2 is RESET (active-high output), Pin 3 is MR (active-low debounced input), and Pin 4 is VCC (monitored supply).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | 0 V return path for all internal circuits; must be connected to system ground plane with low-inductance path. |
| RESET (Pin 2) | Active-high reset output | Drives high (≥0.8 × VCC) when VCC ≥ 2.32 V and MR is high; sinks 1.2 mA at 0.3 V for logic-low state during reset. |
| MR (Pin 3) | Debounced manual reset input | Accepts pulses >10 µs; rejects transients <100 ns; requires pull-up if unused to avoid floating-induced false resets. |
| VCC (Pin 4) | Monitored supply input | Connects to 2.5 V rail; requires 0.1 µF ceramic decoupling capacitor to GND for noise immunity and timing accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | 2.32 V ±1.5% over temperature; eliminates need for external resistor divider in 2.5 V system supervision. |
| Low-power operation | 5 µA typical supply current; extends battery life in portable instruments and remote sensors. |
| Guaranteed reset assertion down to 1.2 V VCC | Ensures processor remains held in reset during deep brownout, preventing undefined execution states. |
| Integrated manual reset debounce | Hardware-filtered MR input removes switch bounce and EMI without firmware or external RC network. |
| RoHS-compliant packaging | Z-suffix indicates lead-free, halogen-free RA-4 package; meets IPC/JEDEC J-STD-020 reflow profile requirements. |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Supervises 2.5 V core supply in programmable logic controller CPU board operating in factory-floor environments with wide ambient temperature swings and electrical noise. IC Role / Device Role / Timing Role: Microprocessor supervisory circuit asserting active-high RESET signal to ARM Cortex-M7 during power-up, brownout, or manual service reset. Use Value: 2.32 V threshold matches 2.5 V rail tolerance; 140 ms timeout accommodates slow-ramping industrial SMPS; 5 µA quiescent current minimizes standby loss. |
Use Scenario: Monitors 2.5 V domain powering CAN transceiver and door-lock MCU in vehicle body electronics unit exposed to −40°C cold cranking and 85°C under-dash conditions. IC Role / Device Role / Timing Role: Voltage monitor generating clean, glitch-immune reset pulse to ensure deterministic boot sequence after ignition cycle or battery disconnect/reconnect. Use Value: −40°C to +85°C rating guarantees function across full automotive temperature range; MR debounce prevents false resets from harness EMI; RoHS Z-suffix satisfies OEM compliance requirements. |
| Portable Medical Sensor Hub | Smart Energy Meter MCU |
Use Scenario: Provides reset control for ultra-low-power sensor fusion MCU powered by coin-cell–backed 2.5 V LDO in handheld diagnostic device. IC Role / Device Role / Timing Role: Supervisory IC holding MCU in reset until stable 2.5 V rail is established post-battery insertion or wake-from-sleep event. Use Value: 5 µA supply current preserves battery capacity; 10 µs MR minimum pulse enables tactile button integration; 240 ms typical reset hold time aligns with sensor initialization latency. |
Use Scenario: Ensures reliable startup of metrology SoC in DIN-rail energy meter where 2.5 V analog front-end and digital core share regulated supply. IC Role / Device Role / Timing Role: Precision voltage supervisor triggering active-high reset to prevent corrupted ADC calibration or flash write during unstable power conditions. Use Value: 30 ppm/°C threshold drift maintains accuracy across meter's operating range; 0.8 × VCC high-level output interfaces directly with SoC's 2.5 V reset input without level shifter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX812ZTR | 2.32 V threshold, active-high reset, SOT-143, but 12 µA max supply current vs. ADM812ZART-REEL's 10 µA max; no guaranteed 1.2 V VCC operation. | Valid for cost-sensitive consumer designs where 5 µA typical current and 1.2 V brownout hold are noncritical. | Select MAX812ZTR only if legacy MAXIM compatibility is required and lower quiescent current is not needed. |
| TPS3808G12DBVR | 2.33 V threshold, active-high reset, SOT-23-5, 1.6 µA typical current, but requires external pull-up on RESET and lacks integrated MR debounce. | Suitable for space-constrained designs needing lowest possible current, but adds BOM cost and layout complexity for MR filtering. | Choose TPS3808G12DBVR when board area is critical and external debounce can be implemented; otherwise ADM812ZART-REEL offers simpler integration. |
Compared with MAX812ZTR and TPS3808G12DBVR, ADM812ZART-REEL uniquely combines 5 µA typical current, guaranteed 1.2 V VCC operation, integrated MR debounce, and RoHS-compliant SOT-143 in a single chip-reducing component count and improving reliability in industrial and automotive 2.5 V systems.
Availability
ADM812ZART-REEL is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, portable medical sensor hubs, smart energy meters, and battery-powered instrumentation requiring stable component supply with full RoHS compliance and −40°C to +85°C qualification.
Supply support for ADM812ZART-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 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 ADM811/ADM812 family was designed specifically for robust, low-power microprocessor supervision in harsh environments-delivering precision voltage monitoring, manual reset integration, and wide-temperature operation without external components.
FAQ
What is the exact reset threshold voltage of ADM812ZART-REEL and its temperature stability?
The ADM812ZART-REEL has a nominal reset threshold of 2.32 V, specified from 2.25 V to 2.38 V over the full −40°C to +85°C operating range. Its temperature coefficient is 30 ppm/°C, ensuring minimal drift across industrial temperature extremes. This precision allows reliable supervision of 2.5 V supplies without external calibration or trimming, and the value is confirmed in Table 4 and Section "Reset Thresholds" of the Rev. H datasheet.
Does ADM812ZART-REEL support active-high reset output and what are its drive capabilities?
Yes, ADM812ZART-REEL provides an active-high RESET output. When asserted, it sources up to 150 µA at 0.8 × VCC (for VCC > 1.8 V), and when deasserted, it sinks up to 1.2 mA while maintaining ≤0.3 V. These values are explicitly defined in Table 1 under "RESET/RESET Output Voltage" and enable direct interfacing with standard 2.5 V CMOS inputs without external pull-up resistors.
What is the minimum VCC voltage at which ADM812ZART-REEL guarantees valid reset operation?
ADM812ZART-REEL guarantees valid RESET output down to VCC = 1.2 V over the full temperature range, as stated in the Absolute Maximum Ratings table and confirmed in the General Description section. Below 1.2 V, the output enters high-impedance state; therefore, system designers must ensure the host processor remains held in reset until VCC exceeds this level, typically via external hold circuitry or processor internal brownout detection.
How does the manual reset (MR) input of ADM812ZART-REEL behave and what are its timing requirements?
The MR input of ADM812ZART-REEL is active-low and internally debounced. It ignores pulses shorter than 100 ns and reliably detects pulses longer than 10 µs. The input thresholds scale with VCC: rising edge trigger occurs above 0.7 × VCC, and falling edge below 0.25 × VCC (for VCC > VTH(MAX)). These specifications are documented in Table 1 and the "Manual Reset" section of the datasheet, ensuring robustness against switch bounce and EMI in real-world deployments.
Is ADM812ZART-REEL RoHS compliant and what does the 'Z' suffix indicate?
Yes, ADM812ZART-REEL is RoHS compliant-the 'Z' suffix explicitly denotes lead-free, halogen-free construction per Analog Devices' ordering guide. The device meets JEDEC J-STD-020 reflow standards and carries branding codes M69 (top-marked) as confirmed in the Ordering Guide on Page 10 of Rev. H. This compliance is mandatory for automotive and industrial equipment sold in EU, China, and other regulated markets.
ADM812ZART-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.32V
- 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
ADM812ZART-REEL FAQ
1.How can I place an order for ADM812ZART-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM812ZART-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 ADM812ZART-REEL reliable?
The price and inventory of ADM812ZART-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM812ZART-REEL is usually 5 days.
3.What payment methods are accepted for ADM812ZART-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM812ZART-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM812ZART-REEL?
ADM812ZART-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM812ZART-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 ADM812ZART-REEL?
For technical support, including ADM812ZART-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM812ZART-REEL requirements.
6.How does Aetrix verify that ADM812ZART-REEL is sourced from the original manufacturer or authorized distributors?
All ADM812ZART-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 ADM812ZART-REEL meets industry standards.
7.What is the process for return or replacement of ADM812ZART-REEL?
All ADM812ZART-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM812ZART-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 ADM812ZART-REEL part is unused and in its original packaging.
Return procedure for ADM812ZART-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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