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Analog Devices Inc. ADM1818-20AKSZ-RL7
- Part No.:
- ADM1818-20AKSZ-RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
ADM1818-20AKSZ-RL7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,391
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Product details
Overview
ADM1818-20AKSZ-RL7 from Analog Devices is a 3-pin SC70-packaged microprocessor reset circuit with open-drain output and internal 5.5 kΩ pull-up resistor, designed to monitor 3 V supply rails by asserting reset when VCC falls below 2.55 V (typical) for ≥150 ms after power-up. It supports manual push-button reset with 1 µs detect-to-RST latency and operates across −40°C to +105°C.
For engineers reviewing the ADM1818-20AKSZ-RL7 datasheet, ADM1818-20AKSZ-RL7 pinout, ADM1818-20AKSZ-RL7 application, or ADM1818-20AKSZ-RL7 equivalent, this device delivers precise low-voltage supervision for space-constrained embedded systems requiring reliable power-on initialization and field-serviceable reset capability.
Technical Context
The ADM1818-20AKSZ-RL7 implements a precision voltage comparator with built-in 150 ms reset timeout delay and hysteresis to prevent chatter during brownout conditions. Its internal reference and temperature-compensated trip point ensure stable 2.55 V threshold operation over full industrial temperature range.
This variant belongs to the ADM1815–ADM1818 family optimized for ≤3.3 V systems and features open-drain RST output compatible with mixed-voltage logic interfaces. The integrated pull-up eliminates external components while enabling wired-OR reset bus configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.55 V typical (2.47–2.64 V min/max); monitors 3 V supplies with 15% headroom. |
| Reset Timeout Delay | 150 ms typical (100–250 ms); ensures power supply stabilization before system release. |
| Supply Range | 1.2 V to 5.5 V; supports wide-input operation including battery-backed systems. |
| Quiescent Current | 4 µA at 3.6 V; enables ultra-low-power supervision in always-on subsystems. |
| Output Type | Open-drain with 5.5 kΩ internal pull-up; simplifies interface to 1.8/2.5/3.3 V logic without external resistor. |
| Push-Button Response | 1 µs detect-to-RST latency; guarantees immediate user-initiated reset assertion. |
| Operating Temp | −40°C to +105°C; qualified for automotive under-hood and industrial control environments. |
Pinout & Package
ADM1818-20AKSZ-RL7 is housed in a 3-lead SC70 (KS-3) package measuring 2.00 mm × 2.10 mm × 0.95 mm, compliant with EIAJ SC70 standards and RoHS-compliant (Z suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RST | Active-low open-drain reset output | Pulled high via internal 5.5 kΩ resistor; sinks 8 mA when asserted; requires external pull-up only if higher voltage logic interface needed. |
| VCC | Supply input and monitored rail | Both powers the IC and serves as the voltage source for threshold comparison; no separate reference input required. |
| GND | Analog and digital ground reference | Single ground connection establishes 0 V reference for comparator and output stage; no separate AGND/DGND pins. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated pull-up resistor | 5.5 kΩ internal pull-up eliminates BOM cost and PCB area for external resistor in standard 3.3 V reset bus designs. |
| Push-button reset support | Dedicated RST pin accepts direct switch-to-ground connection; debounced internally with 150 ms hold time after release. |
| Precision voltage monitoring | ±1.5% trip accuracy over temperature ensures consistent reset behavior across −40°C to +105°C without calibration. |
| Low quiescent current | 4 µA at 3.6 V enables use in energy-harvesting or battery-powered nodes where standby current is critical. |
| SC70 footprint | 2.1 mm × 2.0 mm outline reduces board area by >30% vs. SOT-23, supporting high-density portable and IoT applications. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
Use Scenario: Supervises 3.3 V microcontroller supply in DIN-rail mounted programmable logic controller modules exposed to wide ambient temperature swings and electrical noise. IC Role / Device Role / Timing Role: Voltage monitor and reset generator ensuring safe MCU boot after AC/DC converter startup and during line transients. Use Value: 150 ms reset timeout prevents premature firmware execution; open-drain output allows shared reset bus across multiple MCUs on same board. | Use Scenario: Monitors 3 V supply for LIN gateway microcontroller in automotive door module subject to load dump and cold-crank conditions. IC Role / Device Role / Timing Role: Low-voltage detector that asserts reset during battery sag below 2.55 V and holds reset for 150 ms post-recovery. Use Value: Internal pull-up eliminates need for external resistor in harsh environment; SC70 package withstands reflow and vibration per AEC-Q200 requirements. |
| Medical Wearable Sensor Hub | Smart Energy Meter MCU Subsystem |
Use Scenario: Provides power-on reset for ultra-low-power ARM Cortex-M0+ in compact wearable health monitor powered by coin cell or energy harvester. IC Role / Device Role / Timing Role: Reset supervisor with 4 µA supply current and 2.55 V threshold matching regulated 3 V rail from buck-boost converter. Use Value: Enables <5 µA total system standby current; push-button reset allows user-initiated firmware update without disassembly. | Use Scenario: Supervises 3 V real-time clock and metrology MCU in utility-grade electricity meter operating continuously for 15+ years. IC Role / Device Role / Timing Role: Precision reset generator with ±1.5% threshold tolerance over temperature to guarantee deterministic boot timing across lifetime. Use Value: SC70 package supports automated optical inspection; 105°C rating ensures reliability in sealed, thermally insulated meter enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3123QDBVRQ1 | 2.5 V fixed threshold, 200 ms reset delay, SOT-23-3 package, automotive grade (AEC-Q100) | Higher reset delay; lacks push-button reset function; requires external pull-up | Select when automotive qualification is mandatory and push-button reset is unnecessary. |
| MAX6326UT25+T | 2.5 V threshold, 140 ms reset delay, SOT-23-3, no internal pull-up, no push-button support | Lower quiescent current (0.8 µA), but requires external pull-up and external RC network for manual reset | Select for ultra-low-power battery applications where board space permits external components. |
Compared with TPS3123QDBVRQ1 and MAX6326UT25+T, the ADM1818-20AKSZ-RL7 uniquely integrates push-button reset and internal pull-up in SC70, reducing component count and enabling compact, serviceable designs-ideal for consumer and industrial edge devices where field reset and miniaturization are priorities.
Availability
ADM1818-20AKSZ-RL7 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, medical wearable sensor hubs, and smart energy meter MCU subsystems requiring stable component supply and long-term lifecycle assurance.
Supply support for ADM1818-20AKSZ-RL7 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The ADM181x product line was engineered specifically for cost-sensitive, space-constrained microprocessor reset applications in industrial, automotive, and portable electronics-emphasizing precision threshold accuracy, low power, and simplified integration.
FAQ
What is the exact reset threshold voltage of the ADM1818-20AKSZ-RL7?
The ADM1818-20AKSZ-RL7 has a nominal reset threshold of 2.55 V (typical), with guaranteed minimum and maximum values of 2.47 V and 2.64 V respectively across −40°C to +105°C. This value is specified in Table 1 of the Rev. F datasheet under "VCC TRIP POINT" for the ADM1815-20/ADM1816-20/ADM1817-20/ADM1818-20 variants.
Does the ADM1818-20AKSZ-RL7 require an external pull-up resistor?
No, the ADM1818-20AKSZ-RL7 includes an internal 5.5 kΩ pull-up resistor on the RST pin, eliminating the need for an external component in standard 3.3 V reset bus implementations. External pull-up is only required if interfacing to logic voltages higher than the internal resistor's design target.
Can the ADM1818-20AKSZ-RL7 be used with a manual push-button reset?
Yes-the ADM1818-20AKSZ-RL7 explicitly supports push-button reset per the datasheet's "ADM1813 AND ADM1818" section. Connecting a momentary switch between RST and GND pulls the output low; release triggers a 150 ms (typical) active-low reset pulse, with 1 µs detection latency.
What package type and dimensions does the ADM1818-20AKSZ-RL7 use?
The ADM1818-20AKSZ-RL7 uses the 3-lead SC70 (KS-3) package, with footprint dimensions of 2.00 mm × 2.10 mm and height of 0.95 mm. It complies with EIAJ SC70 standards and is RoHS-compliant (indicated by the "Z" suffix in the part number).
What is the supply current consumption of the ADM1818-20AKSZ-RL7 at 3.6 V?
At VCC = 3.6 V and TA = −40°C to +105°C, the ADM1818-20AKSZ-RL7 draws 4 µA (typical) to 10 µA (max) quiescent current when VCC remains above the reset threshold and no load is applied to the RST pin-enabling ultra-low-power supervision in battery-operated systems.
ADM1818-20AKSZ-RL7 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:
- 2.55V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
ADM1818-20AKSZ-RL7 FAQ
1.How can I place an order for ADM1818-20AKSZ-RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM1818-20AKSZ-RL7 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 ADM1818-20AKSZ-RL7 reliable?
The price and inventory of ADM1818-20AKSZ-RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM1818-20AKSZ-RL7 is usually 5 days.
3.What payment methods are accepted for ADM1818-20AKSZ-RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM1818-20AKSZ-RL7 transactions.
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4.How is shipping managed for ADM1818-20AKSZ-RL7?
ADM1818-20AKSZ-RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM1818-20AKSZ-RL7 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 ADM1818-20AKSZ-RL7?
For technical support, including ADM1818-20AKSZ-RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM1818-20AKSZ-RL7 requirements.
6.How does Aetrix verify that ADM1818-20AKSZ-RL7 is sourced from the original manufacturer or authorized distributors?
All ADM1818-20AKSZ-RL7 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 ADM1818-20AKSZ-RL7 meets industry standards.
7.What is the process for return or replacement of ADM1818-20AKSZ-RL7?
All ADM1818-20AKSZ-RL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM1818-20AKSZ-RL7, 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 ADM1818-20AKSZ-RL7 part is unused and in its original packaging.
Return procedure for ADM1818-20AKSZ-RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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