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Analog Devices Inc. ADM812MARTZ-REEL7
- Part No.:
- ADM812MARTZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
ADM812MARTZ-REEL7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,922
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Product details
Overview
ADM812MARTZ-REEL7 from Analog Devices is a microprocessor supervisory circuit in 4-lead SOT-143 (RA-4) package, providing active-high reset output with 4.38 V threshold, 140–560 ms power-on reset timeout, and 5 µA typical supply current. It monitors 5 V supply rails in embedded controllers and safety-critical systems requiring reliable brownout detection and manual reset capability.
For engineers reviewing the ADM812MARTZ-REEL7 datasheet, ADM812MARTZ-REEL7 pinout, ADM812MARTZ-REEL7 application, or ADM812MARTZ-REEL7 equivalent, this device delivers precision voltage monitoring, glitch-immune manual reset input, and guaranteed reset assertion down to VCC = 1 V - critical for deterministic system startup and fail-safe shutdown in industrial and automotive electronics.
Technical Context
The ADM812MARTZ-REEL7 implements a bandgap-based voltage reference with 30 ppm/°C temperature coefficient and internal debounced manual reset logic that rejects pulses <100 ns while accepting >10 µs pulses. Its reset generator holds RESET high for ≥140 ms after VCC exceeds 4.46 V (max threshold), ensuring stable microprocessor initialization.
It features dual-mode reset assertion: active during VCC undervoltage and upon MR low pulse, with propagation delay ≤0.5 µs and output drive capability of 150 µA source at 0.8 × VCC. The device operates across −40°C to +85°C and supports decoupling via 0.1 µF capacitor on VCC–GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38 V (typical), ±0.08 V over temperature - ensures reliable 5 V rail monitoring with 2% margin before reset activation |
| Reset Timeout | 140–560 ms - guarantees sufficient hold time for microprocessor core and peripherals to stabilize post-power-up |
| Supply Current | 5 µA (typical at VCC < 3.6 V) - enables use in battery-backed or ultra-low-power systems without significant drain |
| Output Type | Active-high RESET - directly interfaces with processors requiring high-valid reset assertion (e.g., ARM Cortex-M, PIC) |
| Manual Reset Pulse Width | ≥10 µs minimum - accommodates mechanical switch bounce and long PCB traces without false triggering |
| Operating Temperature | −40°C to +85°C - qualified for industrial and automotive under-hood environments |
| VCC Range | 1.0 V to 5.5 V - allows valid reset assertion even during deep brownout, holding system in safe state until full recovery |
Pinout & Package
ADM812MARTZ-REEL7 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 0.95 mm pitch.
| 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 noise immunity and accurate threshold operation |
| 2 RESET | Active-high reset output | Open-drain compatible output pulled high externally; remains high during VCC undervoltage or MR assertion, then stays high ≥140 ms after VCC recovery |
| 3 MR | Debounced manual reset input | Active-low input rejecting <100 ns glitches; requires >10 µs low pulse to trigger reset; floats high when unused |
| 4 VCC | Monitored supply input | Accepts 1.0–5.5 V; powers internal circuitry and serves as reference for reset threshold detection; requires 0.1 µF ceramic decoupling to GND |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage monitor | 4.38 V threshold with ±0.16 V total variation over −40°C to +85°C - eliminates need for external resistor divider calibration |
| Low-power operation | 5 µA typical quiescent current - extends battery life in portable instrumentation and remote sensors |
| Glitch-immune manual reset | 100 ns input pulse rejection - prevents spurious resets from EMI or switch contact bounce in harsh environments |
| Valid reset down to 1 V VCC | RESET remains asserted (high) until VCC ≥ 1 V - ensures controlled shutdown during catastrophic supply collapse |
| Guaranteed power-on reset | 140 ms minimum timeout - meets ARM, Intel, and Microchip processor reset timing requirements without external RC network |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Power sequencing and fault recovery in programmable logic controllers exposed to wide ambient temperature swings and electrical transients. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high RESET to halt CPU execution during 5 V rail brownout or cold start. Use Value: Prevents corrupted firmware execution by guaranteeing ≥140 ms reset hold time after VCC stabilizes, meeting IEC 61000-4-4 immunity requirements. |
Use Scenario: Monitoring 5 V supply in body control units managing door locks, lighting, and HVAC functions. IC Role / Device Role / Timing Role: Voltage supervisor triggering safe state entry and diagnostic flagging upon supply dip below 4.38 V. Use Value: Enables AEC-Q100-compliant fail-safe behavior with 5 µA quiescent current supporting always-on monitoring in sleep mode. |
| Medical Patient Monitor | Smart Energy Meter |
Use Scenario: Ensuring deterministic boot sequence in Class II medical devices where supply integrity directly impacts patient safety. IC Role / Device Role / Timing Role: Active-high reset generator interfacing with ARM Cortex-M4 MCU to enforce hardware-initiated reboot on power anomaly. Use Value: 30 ppm/°C threshold drift and −40°C to +85°C operation support FDA-required reliability across clinical environments. |
Use Scenario: Maintaining secure metering state during grid voltage sags or capacitor discharge events in smart electricity meters. IC Role / Device Role / Timing Role: Brownout detector holding real-time clock and metrology ASIC in reset until stable 5 V rail is confirmed. Use Value: Valid RESET output down to VCC = 1 V prevents data corruption during final capacitor discharge phase, preserving billing accuracy. |
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 quiescent current reduces battery runtime | Select only if SOIC footprint is fixed and tighter threshold tolerance (±1.5%) is required over temperature |
| TPS3808G33DBVR | 3.3 V fixed threshold, 200 ms timeout, 1.1 µA typical supply current, SOT-23-5 package | Not suitable for 5 V monitoring; lacks manual reset input; optimized for ultra-low-power 3.3 V systems | Choose only for new 3.3 V designs prioritizing sub-µA quiescent current and smaller footprint than SOT-143 |
Compared with MAX812MESA+ and TPS3808G33DBVR, ADM812MARTZ-REEL7 uniquely combines 4.38 V threshold accuracy, 4-pin SOT-143 space efficiency, manual reset capability, and 1 V minimum VCC operation - making it optimal for cost-sensitive, space-constrained 5 V microcontroller systems requiring robust brownout recovery.
Availability
ADM812MARTZ-REEL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and medical patient monitors requiring stable component supply, RoHS compliance, and long-term lifecycle support.
Supply support for ADM812MARTZ-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 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 microprocessor supervisory functions in space- and power-constrained systems, delivering precision voltage monitoring, manual reset, and guaranteed reset timing without external components.
FAQ
What is the reset threshold voltage of the ADM812MARTZ-REEL7?
The ADM812MARTZ-REEL7 has a nominal reset threshold voltage of 4.38 V at 25°C, with a guaranteed range of 4.30 V to 4.46 V at 25°C and 4.25 V to 4.50 V over the full −40°C to +85°C operating temperature range. This threshold is factory-trimmed and does not require external calibration.
Does the ADM812MARTZ-REEL7 support manual reset functionality?
Yes, the ADM812MARTZ-REEL7 includes a dedicated MR (manual reset) pin (Pin 3) that accepts active-low pulses ≥10 µs in duration. The internal debounce circuit rejects transients <100 ns, making it robust against switch bounce and EMI in noisy industrial environments.
What is the power-on reset timeout duration for the ADM812MARTZ-REEL7?
The ADM812MARTZ-REEL7 provides a minimum power-on reset timeout of 140 ms after VCC rises above the reset threshold, with a maximum of 560 ms depending on process and temperature. This ensures compatibility with microprocessors requiring extended reset hold times for clock stabilization and memory initialization.
Can the ADM812MARTZ-REEL7 operate with supply voltages below 2.5 V?
Yes, the ADM812MARTZ-REEL7 functions with VCC as low as 1.0 V, and its RESET output remains valid (high) down to VCC = 1 V. However, the 4.38 V reset threshold means it is intended for monitoring 5 V supplies - operation below 2.5 V does not trigger reset but maintains output state for safe shutdown sequencing.
Is the ADM812MARTZ-REEL7 RoHS compliant and what package does it use?
Yes, the "Z" suffix in ADM812MARTZ-REEL7 indicates full RoHS compliance per EU Directive 2011/65/EU. It is packaged in a 4-lead SOT-143 (JEDEC RA-4) outline, measuring 2.90 mm × 1.40 mm × 1.07 mm, with gull-wing leads and matte tin plating.
ADM812MARTZ-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:
- 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
ADM812MARTZ-REEL7 FAQ
1.How can I place an order for ADM812MARTZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM812MARTZ-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 ADM812MARTZ-REEL7 reliable?
The price and inventory of ADM812MARTZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM812MARTZ-REEL7 is usually 5 days.
3.What payment methods are accepted for ADM812MARTZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM812MARTZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM812MARTZ-REEL7?
ADM812MARTZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM812MARTZ-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 ADM812MARTZ-REEL7?
For technical support, including ADM812MARTZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM812MARTZ-REEL7 requirements.
6.How does Aetrix verify that ADM812MARTZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADM812MARTZ-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 ADM812MARTZ-REEL7 meets industry standards.
7.What is the process for return or replacement of ADM812MARTZ-REEL7?
All ADM812MARTZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM812MARTZ-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 ADM812MARTZ-REEL7 part is unused and in its original packaging.
Return procedure for ADM812MARTZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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