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Analog Devices Inc. ADM809MAKSZ-REEL
- Part No.:
- ADM809MAKSZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
ADM809MAKSZ-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,373
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Product details
Overview
ADM809MAKSZ-REEL from Analog Devices is a 3-pin SOT-23 microprocessor supervisory circuit with push-pull active-low RESET output, 2.63 V reset threshold (±0.05 V at 25°C), 140–460 ms reset timeout, 17 μA supply current, and operation down to 1.0 V VCC. It ensures reliable power-on reset for embedded microcontrollers in industrial control and instrumentation.
For engineers reviewing the ADM809MAKSZ-REEL datasheet, ADM809MAKSZ-REEL pinout, ADM809MAKSZ-REEL application, or ADM809MAKSZ-REEL equivalent, key selection factors include reset threshold accuracy (±2.7% over −40°C to +125°C), guaranteed reset assertion below 1 V VCC, push-pull drive capability (3.2 mA sink), SC70/SOT-23 package compatibility, and temperature-stable 30 ppm/°C drift.
Technical Context
The ADM809MAKSZ-REEL integrates a precision voltage comparator with built-in glitch immunity and an internal 240 ms (typical) reset timer. Its reference circuit maintains stable threshold detection across −40°C to +125°C, enabling robust brownout response even during fast transients (up to 100 V/μs dV/dt).
This device operates as a standalone reset generator with no external components required: VCC monitoring occurs directly at the supply rail, RESET asserts low when VCC drops below 2.63 V, and remains asserted for ≥140 ms after VCC recovers-ensuring full microprocessor initialization before release.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63 V ±0.05 V at 25°C; guarantees reliable detection of 2.7 V nominal supply collapse |
| Reset Timeout | 140–460 ms over −40°C to +85°C; ensures sufficient hold time for 8-bit/16-bit MCU boot sequences |
| Supply Current | 17 μA typical at VCC < 3.6 V; enables integration into battery-powered portable instruments |
| VCC Operating Range | 1.0 V to 5.5 V; supports reset assertion during deep brownout and full-power operation |
| RESET Output Type | Push-pull active-low; delivers 3.2 mA sink drive without external pull-up resistor |
| Temperature Range | −40°C to +125°C; qualified for under-hood automotive and industrial motor control environments |
| Threshold Drift | 30 ppm/°C; limits total error to ±2.7% across full temperature range |
Pinout & Package
ADM809MAKSZ-REEL uses a 3-lead SOT-23 (RT-3) package per JEDEC TO-236-AB standard, with 1.3 mm × 2.9 mm footprint and 0.95 mm height. Pin 1 = GND, Pin 2 = RESET (active-low push-pull), Pin 3 = VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | 0 V return path for internal comparator and output stage; must be connected to system ground plane |
| RESET (Pin 2) | Active-low push-pull output | Drives low (≤0.4 V @ 3.2 mA) during reset; drives high (≥0.8×VCC) otherwise; interfaces directly to CMOS/MCU reset inputs |
| VCC (Pin 3) | Monitored supply input | Connects to the voltage rail being supervised (e.g., 2.7 V or 3.3 V); powers internal circuitry and defines reset threshold reference |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | 2.63 V with ±2.7% total error over −40°C to +125°C enables accurate detection of 2.7 V supply faults |
| Ultra-low quiescent current | 17 μA typical allows continuous supervision in energy-constrained systems without measurable battery drain |
| Brownout immunity | Operates down to 1.0 V VCC and asserts reset before logic corruption occurs in sub-1.8 V MCUs |
| Glitch-immune comparator | Rejects transients up to 100 V/μs dV/dt, preventing spurious resets during switching noise or ESD events |
| Fixed 240 ms timer | Guarantees minimum reset pulse width independent of external RC timing components or layout parasitics |
Applications
| Industrial PLC I/O Module | Medical Patient Monitor |
|---|---|
Use Scenario: Power sequencing during cold start and AC line interruption in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Supervises 2.7 V FPGA configuration rail and generates synchronized reset to ARM Cortex-M4 core and isolated CAN transceivers. Use Value: Prevents partial configuration lockup by holding reset until 2.7 V stabilizes for ≥240 ms, eliminating field-replaceable unit failures. |
Use Scenario: Battery-backed operation during mains failure in bedside vital sign analyzers. IC Role / Device Role / Timing Role: Monitors 3.3 V backup LDO output and asserts reset to microcontroller when voltage sags below 2.63 V during Li-ion discharge. Use Value: Ensures deterministic shutdown before ADC reference collapse, preserving last-valid measurement integrity. |
| Automotive Body Control Module | Smart Energy Meter |
Use Scenario: Cold-cranking voltage dip (down to 6 V battery → 2.5 V rail) in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Resets 8-bit MCU and LIN transceiver when monitored 2.7 V supply falls below 2.63 V during engine cranking. Use Value: Maintains functional safety by guaranteeing reset assertion at 1.0 V VCC, surviving deeper dips than competing supervisors. |
Use Scenario: Transient suppression during lightning-induced surges on 3.3 V meter SoC supply. IC Role / Device Role / Timing Role: Detects rapid 3.3 V sag caused by MOV clamping and holds MCU in reset until rail recovers and stabilizes. Use Value: Eliminates corrupted flash writes via 240 ms minimum timeout, meeting IEC 62056-21 data integrity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD2T-T | 2.63 V threshold, SOT-23, but 20 μA supply current and −40°C to +85°C rating only | Limited to commercial-temperature industrial gateways; lacks extended temp qualification | Select when cost sensitivity outweighs automotive/industrial temp range needs |
| TPS3808G12DBVR | 1.2 V threshold (not 2.63 V); requires external resistor divider for 2.7 V monitoring | Needs PCB redesign for voltage scaling; adds component count and tolerance stack-up error | Choose only if programmable threshold flexibility justifies added complexity and BOM cost |
Compared with MAX809TRD2T-T and TPS3808G12DBVR, ADM809MAKSZ-REEL provides guaranteed −40°C to +125°C operation, lower 17 μA supply current, and factory-trimmed 2.63 V threshold-enabling drop-in replacement in harsh-environment designs without recalibration or layout changes.
Availability
ADM809MAKSZ-REEL is available at Aetrix Electronics and suitable for industrial PLC I/O modules, medical patient monitors, automotive body control units, smart energy meters, and intelligent instrumentation requiring stable component supply across extended temperature ranges.
Supply support for ADM809MAKSZ-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 ADM809MAKSZ-REEL belongs to Analog Devices' microprocessor supervisory IC family, engineered specifically for fail-safe power monitoring in mission-critical embedded systems where deterministic reset behavior under voltage stress is mandatory.
FAQ
What is the exact reset threshold voltage of ADM809MAKSZ-REEL and how does it vary with temperature?
The ADM809MAKSZ-REEL has a nominal reset threshold of 2.63 V at 25°C, with tolerance of ±0.05 V (±1.9%). Over −40°C to +125°C, the threshold shifts by ≤±0.07 V (±2.7%) due to its 30 ppm/°C temperature coefficient-verified in Table 1 of the Rev. I datasheet. This stability ensures consistent trip points across automotive and industrial operating conditions without calibration.
Does ADM809MAKSZ-REEL require an external pull-up resistor on the RESET pin?
No. ADM809MAKSZ-REEL features a push-pull RESET output, unlike the open-drain ADM803 series. Its RESET pin actively drives high (≥0.8×VCC) and low (≤0.4 V @ 3.2 mA) without external components-confirmed in the General Description and Table 1 specifications. This eliminates BOM cost and layout area associated with pull-up resistors.
What is the minimum VCC voltage at which ADM809MAKSZ-REEL continues to assert RESET?
ADM809MAKSZ-REEL guarantees RESET assertion down to 1.0 V VCC, as specified in the "VCC OPERATING VOLTAGE RANGE" row of Table 1. Below 1.0 V, the internal circuitry ceases operation-but the device remains functional through deep brownout conditions common in automotive cold-crank and battery-depleted scenarios.
How does the 240 ms reset timeout of ADM809MAKSZ-REEL behave across temperature?
The ADM809MAKSZ-REEL's reset timeout is 240 ms typical at 25°C, with a guaranteed minimum of 140 ms and maximum of 460 ms over −40°C to +85°C (Table 1). At +85°C to +125°C, the range widens to 100–840 ms. This variation is intentional and accommodates MCU startup timing margins across all qualified temperatures.
Is ADM809MAKSZ-REEL RoHS compliant and what package does it use?
Yes, ADM809MAKSZ-REEL is RoHS compliant (denoted by "Z" suffix per Ordering Guide footnote 1). It uses a 3-lead SOT-23 (RT-3) package per JEDEC TO-236-AB, with dimensions 2.90 mm × 1.30 mm × 1.02 mm and lead pitch of 0.95 mm-fully compatible with standard SMT reflow profiles and automated assembly lines.
ADM809MAKSZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- 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 Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
ADM809MAKSZ-REEL FAQ
1.How can I place an order for ADM809MAKSZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM809MAKSZ-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 ADM809MAKSZ-REEL reliable?
The price and inventory of ADM809MAKSZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM809MAKSZ-REEL is usually 5 days.
3.What payment methods are accepted for ADM809MAKSZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM809MAKSZ-REEL transactions.
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4.How is shipping managed for ADM809MAKSZ-REEL?
ADM809MAKSZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM809MAKSZ-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 ADM809MAKSZ-REEL?
For technical support, including ADM809MAKSZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM809MAKSZ-REEL requirements.
6.How does Aetrix verify that ADM809MAKSZ-REEL is sourced from the original manufacturer or authorized distributors?
All ADM809MAKSZ-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 ADM809MAKSZ-REEL meets industry standards.
7.What is the process for return or replacement of ADM809MAKSZ-REEL?
All ADM809MAKSZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM809MAKSZ-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 ADM809MAKSZ-REEL part is unused and in its original packaging.
Return procedure for ADM809MAKSZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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