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Analog Devices Inc. ADM825LYRJ-R7
- Part No.:
- ADM825LYRJ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
ADM825LYRJ-R7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,481
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Product details
Overview
ADM825LYRJ-R7 from Analog Devices is a supervisory circuit with manual reset input and dual active-low/active-high push-pull reset outputs, designed for microprocessor supply voltage monitoring and code execution integrity assurance. It features a 4.63 V reset threshold, 140 ms minimum reset timeout, guaranteed reset validity down to VCC = 1 V, and operates across −40°C to +125°C for automotive and industrial embedded systems.
For engineers reviewing the ADM825LYRJ-R7 datasheet, ADM825LYRJ-R7 pinout, ADM825LYRJ-R7 application, or ADM825LYRJ-R7 equivalent, key selection criteria include reset threshold accuracy (±0.07 V at 25°C), manual reset pulse width (≥1 µs), internal 52 kΩ MR pull-up, SC70/SOT-23 package compatibility, and absence of watchdog timer functionality-distinguishing it from ADM823/ADM824 variants.
Technical Context
The ADM825LYRJ-R7 implements a precision bandgap-based reset comparator with 40 ppm/°C temperature coefficient and 5 mV hysteresis, ensuring stable threshold behavior over automotive temperature range. Its dual push-pull RESET/RESET outputs drive logic-level signals without external pull-ups and remain valid even as VCC falls to 1 V.
Unlike ADM823/ADM824, the ADM825LYRJ-R7 omits watchdog input (WDI) entirely and instead provides dedicated manual reset (MR) with integrated debounce and 100 ns glitch rejection. The MR pin features an internal 52 kΩ pull-up resistor and asserts reset for ≥500 ns after MR release, synchronized to the fixed 140 ms reset timeout period.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63 V (typ), ±0.07 V tolerance at 25°C; ensures reliable brownout detection for 5 V systems |
| Reset Timeout | 140 ms (min); guarantees sufficient processor initialization time after power stabilization |
| Supply Current | 5 µA (typ) at VCC = 4.75–5.5 V; enables ultra-low-power operation in battery-backed applications |
| Operating Temp | −40°C to +125°C; qualified for under-hood automotive and harsh industrial environments |
| Reset Output Type | Dual push-pull: active-low RESET and active-high RESET; eliminates need for external pull resistors |
| MR Input Logic | Active-low with 52 kΩ internal pull-up; supports direct push-button connection to GND without external components |
| VCC Validity | Reset outputs guaranteed functional down to VCC = 1 V; supports graceful shutdown during deep undervoltage |
Pinout & Package
ADM825LYRJ-R7 is packaged in a 5-lead SOT-23 (RJ-5) surface-mount package, 2.90 mm × 1.60 mm × 1.15 mm body size, JEDEC MO-178-AA compliant, with gull-wing leads and 0.95 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output; asserted when VCC < 4.63 V, MR low, or during reset timeout |
| 2 | GND | Ground reference for all internal circuitry and output stages |
| 3 | RESET | Active-high push-pull reset output; complementary to Pin 1, valid down to VCC = 1 V |
| 4 | VCC | Monitored power supply input (4.75–5.5 V); powers internal circuitry and defines reset threshold scaling |
| 5 | MR | Manual reset input; active-low, internally pulled up to VCC via 52 kΩ; ≥1 µs pulse required to trigger reset |
Key Features
| Feature | Design Value |
|---|---|
| Dual push-pull RESET outputs | Eliminates external pull resistors and ensures clean, rail-to-rail logic levels for both active-low and active-high reset signaling |
| Guaranteed reset validity to VCC = 1 V | Enables deterministic system shutdown sequencing and avoids metastability during deep brownout conditions |
| Internal 52 kΩ MR pull-up | Reduces BOM count by enabling direct push-button interface without discrete resistor |
| 100 ns MR glitch rejection | Prevents spurious resets from EMI or switch bounce, improving field reliability in noisy environments |
| Automotive temperature range | Supports deployment in engine control units, ADAS modules, and other under-hood electronics without derating |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 5 V microcontroller supply in diesel engine ECU exposed to wide thermal cycling and load dump transients. IC Role / Device Role / Timing Role: Supervisory circuit providing power-on reset, brownout protection, and operator-initiated reset via dashboard service button. Use Value: Dual RESET/RESET outputs interface directly with MCU's nRESET and RESET pins; 4.63 V threshold aligns with 5 V rail tolerance; −40°C to +125°C rating ensures operation across full vehicle lifecycle. |
Use Scenario: Ensures deterministic startup and fault recovery in modular PLC backplane with distributed 5 V power domains. IC Role / Device Role / Timing Role: System-level reset supervisor coordinating firmware initialization across multiple I/O submodules upon power-up or maintenance reset. Use Value: 140 ms reset timeout accommodates slowest peripheral wake-up; MR pin enables hot-swap reset without main power interruption; SOT-23 footprint fits dense PCB layouts. |
| Medical Infusion Pump Controller | Ruggedized Handheld Test Instrument |
Use Scenario: Provides fail-safe reset for ARM Cortex-M based controller managing motor actuation and pressure sensing in battery-powered infusion pump. IC Role / Device Role / Timing Role: Safety-critical voltage monitor ensuring MCU reset during battery voltage sag or charger transition events. Use Value: 5 µA quiescent current extends battery life; reset validity to VCC = 1 V prevents undefined MCU state during final battery discharge; MR allows clinical staff to force reboot without opening enclosure. |
Use Scenario: Manages robust boot sequence in portable oscilloscope with FPGA-based acquisition and Li-ion battery backup. IC Role / Device Role / Timing Role: Primary reset generator synchronizing FPGA configuration, ADC calibration, and display initialization after cold start or brownout. Use Value: Dual push-pull outputs eliminate timing skew between logic families; 40 ppm/°C threshold drift maintains accuracy across operating temperature; SOT-23 package withstands repeated field drop testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM823LYRJ-R7 | Includes watchdog input (WDI) but lacks second RESET output; single active-low RESET only | Required where software deadlock detection is needed; unsuitable if dual-reset signaling is mandatory | Select when watchdog supervision is critical and system design can accommodate single-output reset architecture |
| TPS3808G33DBVR | 3.3 V fixed reset threshold; no manual reset input; open-drain RESET output requiring external pull-up | Targeted at 3.3 V systems without manual intervention needs; incompatible with 5 V rails or push-button reset requirements | Choose only for cost-sensitive 3.3 V applications lacking MR or dual-output requirements |
Compared with ADM825LYRJ-R7, ADM823LYRJ-R7 adds watchdog capability but sacrifices the active-high RESET output, while TPS3808G33DBVR offers lower cost in 3.3 V space but requires external components and lacks MR support-making ADM825LYRJ-R7 uniquely suited for 5 V automotive/industrial systems needing dual-output reset and field-serviceable manual reset.
Availability
ADM825LYRJ-R7 is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, medical infusion pump controllers, and ruggedized handheld test instruments requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM825LYRJ-R7 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 precision instrumentation, industrial automation, communications, and automotive markets since 1965.
The ADM825LYRJ-R7 belongs to Analog Devices' supervisory circuits product line, engineered specifically for robust power monitoring and reset generation in safety-critical embedded systems operating across extreme temperature and voltage conditions.
FAQ
What is the reset threshold voltage of the ADM825LYRJ-R7?
The ADM825LYRJ-R7 has a nominal reset threshold voltage of 4.63 V at 25°C, with a tolerance of ±0.07 V over temperature. This value is factory-trimmed and specified across the full −40°C to +125°C operating range, making ADM825LYRJ-R7 suitable for precise 5 V supply monitoring in automotive and industrial applications where tight voltage margining is required.
Does the ADM825LYRJ-R7 include a watchdog timer function?
No, the ADM825LYRJ-R7 does not include a watchdog timer. Unlike the ADM823 and ADM824 variants, the ADM825LYRJ-R7 is configured exclusively with manual reset (MR) input and dual push-pull RESET/RESET outputs. Its functional block diagram and ordering guide confirm omission of WDI pin and associated watchdog circuitry-ensuring simplified integration where software supervision is handled externally.
What package type is used for the ADM825LYRJ-R7?
The ADM825LYRJ-R7 uses a 5-lead SOT-23 (RJ-5) package per JEDEC MO-178-AA standard, measuring 2.90 mm × 1.60 mm × 1.15 mm with 0.95 mm lead pitch. This compact surface-mount package supports automated assembly and is thermally rated for θJA = 270°C/W, matching the mechanical and thermal requirements of space-constrained automotive and industrial PCB designs.
How does the manual reset (MR) input work on the ADM825LYRJ-R7?
The MR input on ADM825LYRJ-R7 is an active-low signal with an internal 52 kΩ pull-up resistor to VCC. Driving MR below 0.3 × VCC for ≥1 µs asserts both RESET and RESET outputs for the full 140 ms timeout period. The pin includes integrated debounce and rejects glitches ≤100 ns, enabling direct connection to a momentary switch without external RC filtering-simplifying field-serviceable reset implementation in the ADM825LYRJ-R7.
Is the ADM825LYRJ-R7 suitable for automotive applications?
Yes, the ADM825LYRJ-R7 is explicitly qualified for automotive use with guaranteed operation from −40°C to +125°C and compliance with AEC-Q100 stress testing requirements. Its 4.63 V reset threshold, 140 ms timeout, and robust MR interface meet ASIL-B relevant functional safety expectations for engine control, body electronics, and ADAS subsystems-making ADM825LYRJ-R7 a validated choice for automotive-grade designs.
ADM825LYRJ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.63V
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
ADM825LYRJ-R7 FAQ
1.How can I place an order for ADM825LYRJ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM825LYRJ-R7 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 ADM825LYRJ-R7 reliable?
The price and inventory of ADM825LYRJ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM825LYRJ-R7 is usually 5 days.
3.What payment methods are accepted for ADM825LYRJ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM825LYRJ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM825LYRJ-R7?
ADM825LYRJ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM825LYRJ-R7 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 ADM825LYRJ-R7?
For technical support, including ADM825LYRJ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM825LYRJ-R7 requirements.
6.How does Aetrix verify that ADM825LYRJ-R7 is sourced from the original manufacturer or authorized distributors?
All ADM825LYRJ-R7 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 ADM825LYRJ-R7 meets industry standards.
7.What is the process for return or replacement of ADM825LYRJ-R7?
All ADM825LYRJ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM825LYRJ-R7, 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 ADM825LYRJ-R7 part is unused and in its original packaging.
Return procedure for ADM825LYRJ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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