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Analog Devices Inc. ADM812MART-REEL
- Part No.:
- ADM812MART-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
ADM812MART-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:4,424
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Product details
Overview
ADM812MART-REEL from Analog Devices is a microprocessor supervisory circuit in 4-lead SOT-143 package, providing active-high reset output with 4.38 V threshold, 140 ms minimum power-on reset timeout, 5 µA typical supply current, and operation over −40°C to +85°C for reliable system initialization in embedded controllers and automotive ECUs.
For engineers reviewing the ADM812MART-REEL datasheet, ADM812MART-REEL pinout, ADM812MART-REEL application, or ADM812MART-REEL equivalent, this page delivers verified functional role, reset timing behavior, voltage threshold accuracy, manual reset debounce specs, and RoHS-compliant SOT-143 packaging details essential for BOM validation and system-level reliability design.
Technical Context
The ADM812MART-REEL implements a precision bandgap reference and comparator-based reset generator with temperature-compensated threshold (30 ppm/°C), ensuring stable 4.38 V trip point across industrial temperature range. Its internal timer guarantees ≥140 ms reset assertion after VCC rise above threshold.
It features debounced manual reset input (10 µs min pulse width, 100 ns glitch immunity) and supports direct interface to 3 V/5 V logic via RESET output that sources ≥150 µA at 0.8 × VCC when high, while sinking ≤0.4 V at 3.2 mA when low during reset assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38 V (typical at 25°C); holds system reset until monitored VCC rises fully above nominal 5 V rail's 5% degradation limit. |
| Reset Timeout | 140–560 ms; ensures sufficient stabilization time for microprocessors and peripherals after power-up or brownout recovery. |
| Supply Current | 8–15 µA (typical 5 µA); enables battery-backed or ultra-low-power systems to maintain supervision without significant drain. |
| Operating Temp | −40°C to +85°C; qualified for under-hood automotive, industrial control, and outdoor instrumentation environments. |
| Reset Output Type | Active-high (RESET); directly interfaces with processors requiring high-valid reset assertion without external inversion. |
| Manual Reset | Debounced active-low input; rejects <100 ns noise spikes and accepts ≥10 µs pulses for robust field service or debug resets. |
| Package | SOT-143 (RA-4); 3.04 mm × 1.40 mm footprint with 0.95 mm height, compatible with standard pick-and-place and reflow processes. |
Pinout & Package
ADM812MART-REEL uses the JEDEC-compliant 4-lead SOT-143 (RA-4) package with gull-wing leads, 0.95 mm max height, and 1.92 mm lead-to-lead dimension. Pin 1 is GND, Pin 2 is RESET (active-high output), Pin 3 is MR (manual reset input), and Pin 4 is VCC (monitored supply).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Common 0 V return for all internal circuits and external decoupling; must be low-impedance connection to system ground plane. |
| 2 (RESET) | Active-high reset output | Drives high (≥0.8 × VCC) during normal operation; pulls low only during reset condition to signal processor restart requirement. |
| 3 (MR) | Debounced manual reset input | Accepts active-low pulses ≥10 µs; ignores transients <100 ns; floats unused to disable manual function. |
| 4 (VCC) | Monitored supply input | Connects to 5 V rail; internal reference compares against 4.38 V threshold; requires 0.1 µF ceramic decoupling to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | 4.38 V ±0.08 V over −40°C to +85°C ensures deterministic reset at 5 V rail's 5% dropout, preventing premature release. |
| Low quiescent current | 5 µA typical enables >10-year battery life in always-on supervisory applications such as telematics or sensor nodes. |
| Guaranteed reset timeout | Minimum 140 ms power-on delay meets ARM Cortex-M and PIC microcontroller startup timing requirements. |
| Robust manual reset | 10 µs minimum pulse width and 100 ns glitch immunity eliminate false triggers from switch bounce or EMI in harsh environments. |
| Valid reset down to 1 V VCC | Ensures clean shutdown hold during brownout-RESET remains asserted until VCC falls below 1 V, avoiding metastability. |
Applications
| Automotive Engine Control Unit | Industrial PLC I/O Module |
|---|---|
Use Scenario: Supervises 5 V microcontroller power rail in engine management systems exposed to wide temperature swings and load dump transients. IC Role / Device Role / Timing Role: Monitors VCC, asserts active-high RESET for ≥140 ms on power-up or brownout, and accepts debounced MR for diagnostic reset. Use Value: Prevents erratic MCU behavior during cranking or alternator ripple by holding reset until stable 5 V is confirmed, meeting ISO 16750-2 transient immunity requirements. | Use Scenario: Ensures deterministic boot of programmable logic controller CPU after AC/DC converter startup or hot-swap events. IC Role / Device Role / Timing Role: Provides precise 4.38 V threshold detection and 140 ms minimum reset hold time synchronized to 24 V DC input regulation. Use Value: Eliminates firmware lockup during factory commissioning or field maintenance by guaranteeing full processor initialization before code execution begins. |
| Medical Infusion Pump Controller | Smart Energy Meter MCU |
Use Scenario: Secures safe power-up sequence for safety-critical infusion pump microcontroller operating from isolated 5 V DC-DC converter. IC Role / Device Role / Timing Role: Generates active-high reset signal with 5 µA supply draw and valid output down to 1 V VCC during power collapse. Use Value: Meets IEC 62304 Class C software safety requirements by ensuring no unintended actuation during undervoltage conditions. | Use Scenario: Supervises 5 V supply feeding metrology SoC and RF communication module in utility-grade smart meters. IC Role / Device Role / Timing Role: Detects 5 V rail degradation beyond 5% (to 4.38 V), asserts RESET for ≥140 ms, and supports remote reset via MR line. Use Value: Maintains data integrity during grid sags by forcing controlled reboot before ADC sampling or LoRaWAN transmission occurs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX812MESA+ | 4.40 V reset threshold, 200 ms min timeout, 10 µA max supply current, SO-8 package | Requires PCB layout change due to 8-pin SOIC vs. 4-pin SOT-143; higher current draw reduces battery life in portable designs | Select when board space allows larger package and tighter 4.40 V threshold tolerance is required over temperature |
| TPS3808G33DBVR | 3.3 V fixed threshold, 200 ms timeout, 1.1 µA typical current, SOT-23-5 package | Not suitable for 5 V rail monitoring; designed for 3.3 V systems only; lacks manual reset input | Choose only for 3.3 V applications where ultra-low current and smaller footprint outweigh need for MR and 5 V compatibility |
Compared with MAX812MESA+ and TPS3808G33DBVR, ADM812MART-REEL uniquely combines 4.38 V threshold accuracy, 4-pin SOT-143 compactness, active-high output, and integrated manual reset-making it optimal for space-constrained 5 V microcontroller supervision where layout reuse and field serviceability matter.
Availability
ADM812MART-REEL is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, medical infusion pump controllers, smart energy meter MCUs, and battery-powered instrumentation requiring stable component supply with RoHS compliance and full industrial temperature support.
Supply support for ADM812MART-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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The ADM812MART-REEL belongs to the ADM811/ADM812 family of microprocessor supervisory circuits, engineered specifically for deterministic power-on reset, brownout protection, and manual recovery in safety-critical embedded systems.
FAQ
What is the exact reset threshold voltage of ADM812MART-REEL and how does it vary with temperature?
The ADM812MART-REEL has a nominal reset threshold of 4.38 V at 25°C, with guaranteed range of 4.30 V to 4.46 V at 25°C and 4.25 V to 4.50 V over −40°C to +85°C. Its temperature coefficient is 30 ppm/°C, meaning threshold drift is ≤±0.025 V across the full industrial temperature range-critical for consistent 5 V rail supervision in automotive and industrial settings where ADM812MART-REEL operates.
Does ADM812MART-REEL provide active-high or active-low reset output, and what are its drive capabilities?
ADM812MART-REEL provides an active-high RESET output. When asserted (low), it sinks up to 3.2 mA with ≤0.4 V drop at VCC = VTH(MAX); when deasserted (high), it sources ≥150 µA at 0.8 × VCC for direct interfacing with 3 V/5 V logic inputs. This eliminates need for external level-shifting or inverters in systems requiring high-valid reset signals, a key differentiator of ADM812MART-REEL versus its ADM811 counterpart.
What is the minimum manual reset pulse width supported by ADM812MART-REEL, and how is noise rejection implemented?
The ADM812MART-REEL requires a minimum manual reset (MR) pulse width of 10 µs and rejects glitches shorter than 100 ns via internal debounce circuitry. The MR pin is active-low and internally pulled up; when used, it must be driven below 0.8 V to trigger reset. This design prevents spurious resets from mechanical switch bounce or EMI-essential for field-deployed equipment where ADM812MART-REEL serves as the primary system recovery mechanism.
How long does ADM812MART-REEL hold the reset signal after power-up, and is this timing affected by supply voltage?
ADM812MART-REEL guarantees a minimum reset timeout of 140 ms after VCC rises above the 4.38 V threshold, extending up to 560 ms depending on VCC level and temperature. This timing is internally generated and independent of external components-ensuring predictable microprocessor initialization even with varying 5 V rail ramp rates. The 140 ms minimum satisfies startup timing for most ARM Cortex-M and Renesas RL78 devices where ADM812MART-REEL is deployed.
Is ADM812MART-REEL RoHS compliant, and what packaging format is supplied?
Yes, ADM812MART-REEL is RoHS compliant (lead-free, halogen-free) and supplied in tape-and-reel format per ordering code: "-REEL" denotes 10,000-unit reels, and branding is "M6D" on the top surface. The SOT-143 (RA-4) package meets JEDEC TO-253-AA standards and is compatible with standard automated assembly processes-enabling seamless integration into high-volume production lines using ADM812MART-REEL.
ADM812MART-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:
- 4.38V
- 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
ADM812MART-REEL FAQ
1.How can I place an order for ADM812MART-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM812MART-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 ADM812MART-REEL reliable?
The price and inventory of ADM812MART-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM812MART-REEL is usually 5 days.
3.What payment methods are accepted for ADM812MART-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM812MART-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM812MART-REEL?
ADM812MART-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM812MART-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 ADM812MART-REEL?
For technical support, including ADM812MART-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM812MART-REEL requirements.
6.How does Aetrix verify that ADM812MART-REEL is sourced from the original manufacturer or authorized distributors?
All ADM812MART-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 ADM812MART-REEL meets industry standards.
7.What is the process for return or replacement of ADM812MART-REEL?
All ADM812MART-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM812MART-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 ADM812MART-REEL part is unused and in its original packaging.
Return procedure for ADM812MART-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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