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Analog Devices Inc. ADM1815-20AKSZ-RL7
- Part No.:
- ADM1815-20AKSZ-RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
ADM1815-20AKSZ-RL7.pdf
- Description:
- ADM1815 - MICROPROCESSOR SUPERVI
- Quantity:
- Payment:
- Shipping:
Inventory:31,462
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Product details
Overview
ADM1815-20AKSZ-RL7 from Analog Devices is an active-low, push-pull microprocessor reset circuit in SC70-3 package, monitoring 2.5 V supplies with a typical 2.55 V trip point, 150 ms reset timeout, and −40°C to +105°C operating range. It ensures safe system initialization in embedded controllers and industrial microprocessor systems by holding reset until power stabilizes.
For engineers reviewing the ADM1815-20AKSZ-RL7 datasheet, ADM1815-20AKSZ-RL7 pinout, ADM1815-20AKSZ-RL7 application, or ADM1815-20AKSZ-RL7 equivalent, key selection criteria include reset polarity (active low), supply voltage compatibility (2.5 V rail), guaranteed reset timeout (100–250 ms), and SC70-3 footprint constraints for space-constrained designs.
Technical Context
The ADM1815-20AKSZ-RL7 integrates a precision voltage comparator with hysteresis, internal timing capacitor, and push-pull output stage. Its reset assertion is triggered when VCC falls below 2.55 V (typ), with ±1.5% threshold accuracy over temperature and 150 ms typical delay after VCC rise before deassertion.
It operates across full industrial temperature range (−40°C to +105°C) with supply current as low as 4 µA at 3.6 V, enabling use in battery-backed or low-power microcontroller applications where quiescent current and thermal stability are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.55 V typical (2.47–2.64 V min/max); monitors 2.5 V logic rails with margin for ripple and drift |
| Reset Timeout | 100–250 ms (150 ms typical); guarantees stable power-up before processor release |
| Output Type | Active-low push-pull; drives MCU reset pin directly without external pull-up |
| Supply Range | 1.2 V to 5.5 V; supports operation down to 1.2 V while monitoring higher rails |
| Quiescent Current | 4 µA at 3.6 V; enables long-term operation in always-on supervisory circuits |
| Operating Temp | −40°C to +105°C; qualified for industrial and automotive under-hood environments |
| Package | SC70-3 (KS-3); 2.0 mm × 1.25 mm footprint, compatible with high-density PCB layouts |
Pinout & Package
ADM1815-20AKSZ-RL7 uses a 3-lead SC70 (KS-3) package with exposed pad not electrically connected. Pin 1 = RST (active-low reset output), Pin 2 = VCC (monitored supply input), Pin 3 = GND (0 V reference).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RST | Active-low reset output | Pull-down to GND during fault; releases high after timeout - directly interfaces standard /RESET inputs |
| VCC | Supply voltage input | Monitors this node; device draws current from it and compares against internal reference |
| GND | Ground reference | 0 V return path for both comparator and output stage; must be low-impedance for accurate thresholding |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset timeout | 100–250 ms window ensures robust power stabilization before CPU release |
| Push-pull output | Eliminates need for external pull-up resistor, reducing BOM count and layout area |
| High-accuracy threshold | ±1.5% over temperature enables reliable 2.5 V rail supervision without derating |
| Low supply current | 4 µA at 3.6 V allows integration into always-on subsystems without battery drain impact |
| Wide supply range | 1.2 V to 5.5 V operation permits use with diverse host supplies while monitoring fixed rail |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Supervises 2.5 V I/O supply in programmable logic controller CPU board during cold cranking and load dump events. IC Role / Device Role / Timing Role: Active-low reset generator ensuring firmware does not execute until 2.5 V rail settles within spec. Use Value: Prevents spurious resets caused by transient dips below 2.47 V, leveraging 2.55 V threshold and 150 ms hold-off. | Use Scenario: Monitors 2.5 V sensor interface rail in body control unit exposed to wide ambient temperature swings (−40°C to +105°C). IC Role / Device Role / Timing Role: Voltage supervisor with guaranteed reset assertion on undervoltage and precise timeout on recovery. Use Value: Maintains functional safety compliance by enforcing minimum reset duration even at temperature extremes. |
| Medical Diagnostic Handheld | Smart Energy Meter |
Use Scenario: Ensures clean boot of ARM Cortex-M4 processor powered from regulated 2.5 V DC-DC converter in portable ultrasound device. IC Role / Device Role / Timing Role: Reset sequencer that holds /RESET low until 2.5 V rail remains above 2.47 V for ≥100 ms. Use Value: Eliminates boot failures due to slow-rising or noisy 2.5 V supply, improving field reliability. | Use Scenario: Supervises 2.5 V RTC and metering ASIC supply in DIN-rail energy meter operating continuously for 15+ years. IC Role / Device Role / Timing Role: Long-life voltage monitor with <5 µA quiescent current and AEC-Q100–equivalent thermal robustness. Use Value: Extends battery backup runtime and avoids false resets from seasonal voltage drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326-L25T+ | Active-low open-drain output; requires external pull-up; 2.5 V threshold, 200 ms timeout | Suitable where board already includes pull-up or level-shifting is needed | Select if open-drain flexibility is required and layout allows external resistor |
| TPS3808G125DBVR | Active-low push-pull; 2.5 V threshold; 200 ms timeout; 1.4 µA IQ; SOT-23-3 package | Better quiescent current but larger SOT-23 footprint vs. SC70 | Prefer for ultra-low-power designs where board space permits SOT-23 |
Compared with MAX6326-L25T+ and TPS3808G125DBVR, ADM1815-20AKSZ-RL7 offers SC70-3 size advantage and tighter threshold tolerance (±1.5% vs. ±2.5%), making it optimal for compact, high-accuracy 2.5 V supervision where push-pull drive is acceptable.
Availability
ADM1815-20AKSZ-RL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical handheld diagnostics, and smart energy meters requiring stable component supply with guaranteed long-term availability.
Supply support for ADM1815-20AKSZ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The ADM181x series was designed specifically for cost-sensitive, space-constrained microprocessor reset applications requiring precise voltage thresholds, guaranteed timeout, and industrial temperature operation - targeting embedded controllers and instrumentation.
FAQ
What is the exact reset threshold voltage of ADM1815-20AKSZ-RL7?
The ADM1815-20AKSZ-RL7 has a nominal reset threshold of 2.55 V (typical), with guaranteed limits of 2.47 V (min) and 2.64 V (max) across −40°C to +105°C. This is specified in Table 1 of the Rev. F datasheet and applies exclusively to the -20 variant, confirming its suitability for 2.5 V supply monitoring with adequate noise margin.
Does ADM1815-20AKSZ-RL7 require an external pull-up resistor on the RST pin?
No, ADM1815-20AKSZ-RL7 features an active-low push-pull output stage and does not require an external pull-up resistor. Its RST pin actively drives low during reset and high when released, enabling direct connection to standard microprocessor /RESET inputs without additional components.
What is the reset timeout behavior of ADM1815-20AKSZ-RL7 during power-up?
During power-up, ADM1815-20AKSZ-RL7 asserts RST low while VCC is below 2.47 V and holds it low for 100–250 ms (150 ms typical) after VCC rises above the threshold. This ensures the monitored 2.5 V supply stabilizes before releasing the processor, preventing premature execution.
Can ADM1815-20AKSZ-RL7 monitor supplies lower than 2.5 V?
No - ADM1815-20AKSZ-RL7 is factory-trimmed for 2.55 V (typ) threshold and is not specified for sub-2.5 V rails. For 2.18 V or 2.31 V monitoring, Analog Devices offers ADM1815-R22AKSZ-RL7 and ADM1815-R23AKSZ-RL7 variants respectively, each with dedicated trim and validation.
Is ADM1815-20AKSZ-RL7 RoHS compliant and halogen-free?
Yes, ADM1815-20AKSZ-RL7 is RoHS compliant (denoted by "Z" suffix per Ordering Guide) and meets JEDEC JS709C halogen-free requirements. The SC70-3 package uses lead-free matte tin finish and complies with Analog Devices' environmental specifications in Rev. F documentation.
ADM1815-20AKSZ-RL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.55V
- Output:
- Push-Pull, Totem Pole
- 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
ADM1815-20AKSZ-RL7 FAQ
1.How can I place an order for ADM1815-20AKSZ-RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM1815-20AKSZ-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 ADM1815-20AKSZ-RL7 reliable?
The price and inventory of ADM1815-20AKSZ-RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM1815-20AKSZ-RL7 is usually 5 days.
3.What payment methods are accepted for ADM1815-20AKSZ-RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM1815-20AKSZ-RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM1815-20AKSZ-RL7?
ADM1815-20AKSZ-RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM1815-20AKSZ-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 ADM1815-20AKSZ-RL7?
For technical support, including ADM1815-20AKSZ-RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM1815-20AKSZ-RL7 requirements.
6.How does Aetrix verify that ADM1815-20AKSZ-RL7 is sourced from the original manufacturer or authorized distributors?
All ADM1815-20AKSZ-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 ADM1815-20AKSZ-RL7 meets industry standards.
7.What is the process for return or replacement of ADM1815-20AKSZ-RL7?
All ADM1815-20AKSZ-RL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM1815-20AKSZ-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 ADM1815-20AKSZ-RL7 part is unused and in its original packaging.
Return procedure for ADM1815-20AKSZ-RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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