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Analog Devices Inc. ADM1818-R22AKS-RL7
- Part No.:
- ADM1818-R22AKS-RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
ADM1818-R22AKS-RL7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,026
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Product details
Overview
ADM1818-R22AKS-RL7 from Analog Devices is a microprocessor reset circuit with open-drain output and internal pull-up resistor, designed to monitor 2.5 V supply rails. It features a 2.18 V typical reset threshold, 150 ms reset timeout, −40°C to +105°C operating temperature range, and SC70-3 package. It enables safe system initialization in embedded controllers requiring reliable power-on reset.
For engineers reviewing the ADM1818-R22AKS-RL7 datasheet, ADM1818-R22AKS-RL7 pinout, ADM1818-R22AKS-RL7 application, or ADM1818-R22AKS-RL7 equivalent, this page delivers verified specifications, functional context, package details, real-world use cases, and validated alternative options for industrial-grade voltage monitoring designs.
Technical Context
The ADM1818-R22AKS-RL7 implements a precision voltage comparator with built-in hysteresis and a fixed 150 ms power-up reset delay timer. Its internal reference ensures stable trip point accuracy across temperature, and its open-drain output with integrated 5.5 kΩ pull-up resistor simplifies interface to microcontroller reset inputs without external components.
This device belongs to the ADM181x family optimized for low-power, space-constrained applications. It supports manual reset via push-button connection to the RST pin, with sub-microsecond button detect latency and guaranteed 150 ms reset assertion after release - critical for field-serviceable embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.18 V typical (min 2.12 V, max 2.25 V); monitors 2.5 V supplies with margin for brownout detection |
| Reset Timeout | 150 ms typical (100–250 ms range); ensures power supply stabilization before system release |
| Supply Range | 1.2 V to 5.5 V; operates correctly even during undervoltage conditions down to 1.2 V |
| Quiescent Current | 4 µA typical at 3.6 V; enables battery-backed or ultra-low-power standby operation |
| Output Type | Open-drain with internal 5.5 kΩ pull-up; eliminates need for external resistor in most MCU reset circuits |
| Operating Temp | −40°C to +105°C; qualified for automotive under-hood and industrial control environments |
| Push-Button Support | 1 µs detect latency, 150 ms post-release reset hold; enables field-reset capability without additional logic |
Pinout & Package
ADM1818-R22AKS-RL7 is housed in a 3-lead SC70 (KS-3) package - a compact, surface-mount outline measuring 2.00 mm × 2.10 mm × 0.95 mm with 0.65 mm lead pitch. The package is RoHS-compliant and JEDEC SC70-3 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RST | Active-low open-drain reset output | Pulled low when VCC < threshold; floats high (via internal 5.5 kΩ) when reset inactive; compatible with 1.8 V–5 V logic |
| VCC | Supply voltage input | Monitored rail input; also powers internal circuitry; accepts 1.2 V–5.5 V |
| GND | Ground reference | 0 V return path for comparator, timer, and output stage; must be low-impedance for accurate threshold tracking |
Key Features
| Feature | Design Value |
|---|---|
| Internal pull-up resistor | 5.5 kΩ typical (3.1–7.5 kΩ range); eliminates external component and PCB footprint for reset line termination |
| Manual reset support | Detects push-button closure to GND with <1 µs latency and asserts 150 ms reset pulse on release - no external debounce needed |
| Temperature-stable threshold | ±1.5% variation over −40°C to +105°C; ensures consistent brownout response across environmental extremes |
| Low supply current | 4 µA at 3.6 V; reduces load on backup batteries or energy-harvesting power sources during sleep modes |
| SC70-3 footprint | 2.0 mm × 2.1 mm area; saves >40% board space vs. SOT-23 while maintaining same pinout compatibility |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Power cycling due to engine cranking causes transient dips on 2.5 V logic rail. IC Role / Device Role / Timing Role: Monitors 2.5 V domain and holds MCU in reset until rail stabilizes above 2.18 V for ≥150 ms. Use Value: Prevents corrupted register writes or firmware lockup during cold-crank voltage sag. | Use Scenario: Infotainment head unit experiences intermittent resets after ignition-off/ignition-on transitions. IC Role / Device Role / Timing Role: Provides clean, debounced reset signal synchronized to 2.5 V supply recovery with 150 ms timeout. Use Value: Eliminates spurious reboots caused by slow-rising or noisy 2.5 V LDO output. |
| Medical Sensor Node | Smart Energy Meter |
Use Scenario: Battery-powered wearable sensor enters deep sleep and requires deterministic wake-up reset. IC Role / Device Role / Timing Role: Acts as supply supervisor and manual reset interface - push-button pulls RST low to initiate full system restart. Use Value: Enables user-triggered firmware recovery without removing battery or accessing debug headers. | Use Scenario: Mains-powered meter uses isolated 2.5 V rail for metrology ADC; supply noise triggers false resets. IC Role / Device Role / Timing Role: Voltage monitor with precise 2.18 V threshold rejects short transients (<10 µs) while asserting reset on sustained brownout. Use Value: Improves reset immunity per IEC 61000-4-4 (EFT) requirements without sacrificing responsiveness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809RTRG+T | 2.16 V reset threshold (±2.5%), SOT-23-3, no internal pull-up - requires external resistor | Lacks push-button reset support; lower temp grade (−40°C to +85°C) | Choose when cost sensitivity outweighs manual reset need and SC70 size advantage |
| TPS3808G12DBVR | 2.2 V threshold (±0.5%), SOT-23-6, adjustable delay, higher quiescent current (8 µA) | Requires external capacitor for delay tuning; larger footprint and more pins | Prefer when tighter threshold tolerance or programmable timeout is required despite added complexity |
Compared with MAX809RTRG+T and TPS3808G12DBVR, the ADM1818-R22AKS-RL7 delivers integrated push-button support, SC70 space savings, and guaranteed 105°C operation - making it optimal for compact, field-serviceable, high-reliability 2.5 V system supervision.
Availability
ADM1818-R22AKS-RL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical sensor nodes, and smart energy meters requiring stable component supply and long-term manufacturability.
Supply support for ADM1818-R22AKS-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The ADM181x product line was engineered specifically for robust, low-cost microprocessor reset supervision in space- and power-constrained embedded systems - emphasizing precision threshold stability, minimal external components, and extended temperature reliability.
FAQ
What is the exact reset threshold voltage of the ADM1818-R22AKS-RL7?
The ADM1818-R22AKS-RL7 has a nominal reset threshold of 2.18 V, with guaranteed minimum and maximum values of 2.12 V and 2.25 V respectively, measured across −40°C to +105°C. This threshold is factory-trimmed and specified in Table 1 of the Rev. F datasheet. The "R22" suffix explicitly denotes the 2.18 V trip point variant within the ADM1818 family.
Does the ADM1818-R22AKS-RL7 require an external pull-up resistor on the RST pin?
No, the ADM1818-R22AKS-RL7 includes an internal pull-up resistor of 5.5 kΩ (typical, 3.1–7.5 kΩ range) connected to VCC. This eliminates the need for an external resistor in standard microcontroller reset configurations. The internal pull-up ensures proper logic-high state when reset is inactive, reducing BOM count and PCB area.
Can the ADM1818-R22AKS-RL7 be used with a push-button for manual reset?
Yes, the ADM1818-R22AKS-RL7 supports manual reset via a push-button switch connected between the RST pin and GND. Pressing the button pulls RST low; upon release, the device asserts a clean 150 ms (typical) active-low reset pulse. This function is explicitly documented in the "ADM1813 AND ADM1818" section of the datasheet and requires no external timing components.
What package type does the ADM1818-R22AKS-RL7 use, and is it RoHS-compliant?
The ADM1818-R22AKS-RL7 uses the 3-lead SC70 (KS-3) package - a JEDEC-standard, RoHS-compliant outline with dimensions 2.00 mm × 2.10 mm × 0.95 mm. The "Z" in the part number suffix (e.g., -RL7) confirms RoHS compliance per Analog Devices' ordering guide, and the device meets lead-free soldering profiles including vapor phase (215°C) and infrared (220°C).
How does the ADM1818-R22AKS-RL7 handle fast supply transients?
The ADM1818-R22AKS-RL7 incorporates comparator hysteresis and a minimum detect time of 10 µs for falling VCC edges, preventing false resets from brief supply glitches. Figure 8 in the datasheet shows it tolerates transients up to ~300 µs at 20 mV overdrive - ensuring immunity to common switching noise while remaining responsive to genuine brownout events.
ADM1818-R22AKS-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:
- 2.18V
- 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-R22AKS-RL7 FAQ
1.How can I place an order for ADM1818-R22AKS-RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM1818-R22AKS-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-R22AKS-RL7 reliable?
The price and inventory of ADM1818-R22AKS-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-R22AKS-RL7 is usually 5 days.
3.What payment methods are accepted for ADM1818-R22AKS-RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM1818-R22AKS-RL7 transactions.
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4.How is shipping managed for ADM1818-R22AKS-RL7?
ADM1818-R22AKS-RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM1818-R22AKS-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-R22AKS-RL7?
For technical support, including ADM1818-R22AKS-RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM1818-R22AKS-RL7 requirements.
6.How does Aetrix verify that ADM1818-R22AKS-RL7 is sourced from the original manufacturer or authorized distributors?
All ADM1818-R22AKS-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-R22AKS-RL7 meets industry standards.
7.What is the process for return or replacement of ADM1818-R22AKS-RL7?
All ADM1818-R22AKS-RL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM1818-R22AKS-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-R22AKS-RL7 part is unused and in its original packaging.
Return procedure for ADM1818-R22AKS-RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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