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Analog Devices Inc. ADM812ZARTZ-REEL
- Part No.:
- ADM812ZARTZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
ADM812ZARTZ-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,542
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Product details
Overview
ADM812ZARTZ-REEL from Analog Devices is a microprocessor supervisory circuit in 4-lead SOT-143 package, providing active-high reset output with 2.32 V threshold, 140–560 ms 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 safety-critical instrumentation.
For engineers reviewing the ADM812ZARTZ-REEL datasheet, ADM812ZARTZ-REEL pinout, ADM812ZARTZ-REEL application, or ADM812ZARTZ-REEL equivalent, key selection factors include reset threshold accuracy (±2.5% over temperature), manual reset debounce (10 µs minimum pulse width), glitch immunity (100 ns), low-power operation, and compatibility with 2.5 V logic systems requiring reliable brownout detection.
Technical Context
The ADM812ZARTZ-REEL implements a precision bandgap voltage reference and comparator-based reset generator with internal timing capacitor, delivering a guaranteed active-high RESET signal for ≥140 ms after VCC rises above 2.32 V. Its reset assertion remains valid down to VCC = 1.2 V at full temperature range.
It features a debounced manual reset input (MR) with 10 µs minimum pulse acceptance and 100 ns glitch rejection, and supports direct interfacing to CMOS logic via VCC-proportional high-level output (0.8 × VCC) and low-level sink capability (0.3 V @ 1.2 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.32 V nominal, ±2.5% over −40°C to +85°C - ensures reliable detection of 2.5 V rail collapse before system instability. |
| Supply Current | 5 µA typical at VCC < 3.6 V - enables use in battery-backed or ultra-low-power monitoring applications. |
| Reset Timeout | 140–560 ms after VCC rise - provides sufficient stabilization time for 2.5 V microcontrollers and peripherals. |
| Operating Voltage Range | 1.2 V to 5.5 V - supports operation during deep brownout while maintaining valid RESET assertion. |
| Output Type | Active-high RESET - directly interfaces with processors requiring high-valid reset enable (e.g., ARM Cortex-M0+ reset pins). |
| Manual Reset Pulse Width | ≥10 µs - rejects switch bounce and EMI-induced transients in industrial control panels. |
| Reset Propagation Delay | 0.5 µs - ensures fast response to supply faults without compromising noise immunity. |
Pinout & Package
ADM812ZARTZ-REEL is housed in a JEDEC-compliant 4-lead SOT-143 (RA-4) package, 2.90 mm × 1.40 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 connected to system ground plane for stable threshold reference. |
| 2 (RESET) | Active-high reset output | Drives high (≥0.8 × VCC) when VCC ≥ threshold; sinks 1.2 mA at 0.3 V during reset - compatible with 2.5 V CMOS inputs. |
| 3 (MR) | Debounced manual reset input | Active-low; accepts pulses ≥10 µs; ignores noise ≤100 ns - eliminates need for external RC filtering in panel-mounted reset buttons. |
| 4 (VCC) | Monitored supply input | Accepts 1.2–5.5 V; requires 0.1 µF decoupling to GND - enables direct monitoring of 2.5 V core rails without level-shifting. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.32 V threshold | Enables accurate supervision of 2.5 V supplies with 5% tolerance margin, reducing false resets during transient load dips. |
| 140 ms minimum power-on reset | Guarantees processor initialization completes before code execution begins, preventing boot failures in FPGA-configured systems. |
| 5 µA typical quiescent current | Extends battery life in portable medical instruments where continuous supervision is required between wake cycles. |
| VCC-proportional high-level output | Ensures logic-high compatibility across varying supply voltages (e.g., 2.5 V vs. 3.3 V domains) without external level translators. |
| Reset valid down to 1.2 V VCC | Maintains controlled shutdown during deep brownout, avoiding metastability in microcontroller I/O states. |
Applications
| Industrial PLC Controller | Medical Patient Monitor |
|---|---|
Use Scenario: Supervises 2.5 V core supply of ARM-based controller in programmable logic controller subjected to 24 V DC field wiring noise. IC Role / Device Role / Timing Role: Microprocessor supervisory circuit asserting active-high RESET during undervoltage events and manual maintenance reset. Use Value: Prevents corrupted ladder logic execution during 24 V bus transients by holding processor in reset until 2.5 V rail stabilizes for ≥140 ms. | Use Scenario: Monitors backup battery-supplied 2.5 V rail powering ECG signal processing ASIC in portable patient monitor. IC Role / Device Role / Timing Role: Low-power voltage supervisor ensuring safe shutdown before battery voltage drops below ASIC operational minimum. Use Value: 5 µA quiescent current extends battery runtime; 2.32 V threshold triggers reset before analog front-end distortion occurs. |
| Automotive Body Control Module | Railway Signaling Interface |
Use Scenario: Embedded in 12 V automotive body control unit where 2.5 V microcontroller domain experiences load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Brownout detector with manual reset for field-service recovery after firmware lockup. Use Value: Glitch immunity (100 ns) rejects alternator ripple; MR debounce prevents false resets from relay coil flyback coupling. | Use Scenario: Used in EN 5012x-compliant signaling interface board where 2.5 V FPGA configuration memory must remain valid during track power interruptions. IC Role / Device Role / Timing Role: Fail-safe reset generator ensuring FPGA reconfiguration only after stable 2.5 V rail is confirmed for ≥300 ms. Use Value: Extended timeout option (up to 700 ms) meets railway safety requirement for deterministic reset hold time after power restoration. |
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, SOT-143, but 20 µA max supply current vs. 15 µA for ADM812ZARTZ-REEL; no specified MR debounce spec. | Valid for cost-sensitive consumer designs where 15 µA vs. 20 µA has negligible impact on battery life. | Select MAX812ZTR only if MR debounce is handled externally and higher quiescent current is acceptable. |
| TPS3808G12DBVR | 2.33 V threshold, SOT-23-5, 1.1 µA typical supply current, but requires external pull-up and lacks integrated MR debounce. | Suitable for space-constrained PCBs where 5-pin SOT-23 fits better than 4-pin SOT-143, and manual reset is implemented digitally. | Choose TPS3808G12DBVR when ultra-low power dominates layout constraints and MR is software-controlled. |
Compared with MAX812ZTR and TPS3808G12DBVR, ADM812ZARTZ-REEL uniquely combines 5 µA typical current, integrated MR debounce, and SOT-143 footprint - making it optimal for industrial 2.5 V systems needing robust manual recovery and minimal board area.
Availability
ADM812ZARTZ-REEL is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical instruments, automotive body control modules, and railway signaling interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM812ZARTZ-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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The ADM811/ADM812 product line was designed specifically for reliable microprocessor supervision in harsh environments - delivering accurate voltage monitoring, manual reset integration, and low-power operation for safety-critical embedded systems.
FAQ
What is the exact reset threshold voltage of ADM812ZARTZ-REEL and how does it vary with temperature?
The ADM812ZARTZ-REEL has a nominal reset threshold of 2.32 V at 25°C, with guaranteed range of 2.25 V to 2.38 V over −40°C to +85°C. This ±2.5% variation ensures consistent detection of 2.5 V supply degradation across industrial temperature extremes without requiring external calibration. The ADM812ZARTZ-REEL uses a trimmed bandgap reference to maintain this stability.
Does ADM812ZARTZ-REEL support manual reset functionality, and what are its timing requirements?
Yes, ADM812ZARTZ-REEL includes a debounced manual reset (MR) input that accepts active-low pulses ≥10 µs and rejects glitches ≤100 ns. This eliminates need for external RC filters in noisy environments like factory floors. The MR pin operates referenced to VCC (rising threshold = 0.7 × VCC), ensuring compatibility across 2.5 V systems. ADM812ZARTZ-REEL asserts RESET high within 0.5 µs of MR activation.
What is the power-on reset timeout duration for ADM812ZARTZ-REEL, and is it adjustable?
The ADM812ZARTZ-REEL provides a fixed power-on reset timeout of 140 ms minimum to 560 ms maximum after VCC rises above the 2.32 V threshold. This timing is generated by an internal capacitor and is not user-adjustable. It is optimized to exceed typical 2.5 V microcontroller startup times while remaining compatible with FPGA configuration clocks. The ADM812ZARTZ-REEL guarantees this window across full temperature and voltage range.
Can ADM812ZARTZ-REEL operate reliably during deep supply brownouts?
Yes, ADM812ZARTZ-REEL maintains valid active-high RESET assertion down to VCC = 1.2 V over −40°C to +85°C, per Absolute Maximum Ratings and functional specifications. Its internal reference and comparator remain operational well below standard 2.5 V rail collapse points, ensuring the microcontroller stays held in reset until supply recovers sufficiently - a critical feature for fail-safe behavior in safety-rated systems using ADM812ZARTZ-REEL.
What package type and lead finish does ADM812ZARTZ-REEL use, and is it RoHS compliant?
ADM812ZARTZ-REEL uses a 4-lead SOT-143 (RA-4) package with gull-wing leads and matte tin (Sn) lead finish. The "Z" suffix explicitly denotes RoHS compliance per EU Directive 2011/65/EU, including exemption 7a for lead in high-melting-temperature solder. The device is supplied on 3,000-piece reels (REEL7) with M69 top-side marking, and meets JEDEC TO-253-AA mechanical standards.
ADM812ZARTZ-REEL 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:
- 2.32V
- 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
ADM812ZARTZ-REEL FAQ
1.How can I place an order for ADM812ZARTZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM812ZARTZ-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 ADM812ZARTZ-REEL reliable?
The price and inventory of ADM812ZARTZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM812ZARTZ-REEL is usually 5 days.
3.What payment methods are accepted for ADM812ZARTZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM812ZARTZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM812ZARTZ-REEL?
ADM812ZARTZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM812ZARTZ-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 ADM812ZARTZ-REEL?
For technical support, including ADM812ZARTZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM812ZARTZ-REEL requirements.
6.How does Aetrix verify that ADM812ZARTZ-REEL is sourced from the original manufacturer or authorized distributors?
All ADM812ZARTZ-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 ADM812ZARTZ-REEL meets industry standards.
7.What is the process for return or replacement of ADM812ZARTZ-REEL?
All ADM812ZARTZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM812ZARTZ-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 ADM812ZARTZ-REEL part is unused and in its original packaging.
Return procedure for ADM812ZARTZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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