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Analog Devices Inc. ADM825RYRJ-R7
- Part No.:
- ADM825RYRJ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
ADM825RYRJ-R7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,011
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Product details
Overview
ADM825RYRJ-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 in automotive-grade systems. It features a 2.63 V reset threshold (±45 mV over temperature), 140 ms minimum reset timeout, guaranteed reset validity down to VCC = 1 V, and operates across −40°C to +125°C. It is used in engine control units to ensure deterministic restart during brownout conditions.
For engineers reviewing the ADM825RYRJ-R7 datasheet, ADM825RYRJ-R7 pinout, ADM825RYRJ-R7 application, or ADM825RYRJ-R7 equivalent, key selection criteria include reset threshold accuracy, manual reset timing integrity, dual-output drive capability, automotive temperature compliance, and SC70/SOT-23 package compatibility with high-density PCB layouts.
Technical Context
The ADM825RYRJ-R7 implements a precision bandgap-based reset comparator with 40 ppm/°C temperature coefficient and 5 mV hysteresis, ensuring stable trip point across automotive temperature extremes. Its dual push-pull outputs (RESET and RESET) provide simultaneous active-low and active-high signaling without external pull resistors.
It integrates an internal 52 kΩ MR pull-up resistor and debounces manual reset pulses ≥1 µs, rejecting transients <100 ns. Unlike ADM823/ADM824, it omits watchdog functionality-enabling simplified firmware integration where code execution monitoring is handled externally or not required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63 V (typ), ±45 mV over −40°C to +125°C - sets precise brownout detection point for 2.7 V–3.6 V logic domains |
| Reset Timeout | 140 ms (min) - ensures sufficient hold time for microprocessor initialization after power stabilization |
| Supply Current | 5 µA (typ) at VCC = 2.7 V–3.6 V - enables always-on supervision in battery-backed systems |
| Output Type | Dual push-pull (RESET, RESET) - eliminates need for external pull-up/pull-down resistors and supports mixed-logic interface |
| VCC Validity Range | 1 V to 3.6 V - guarantees functional reset assertion even during deep undervoltage events |
| MR Input Pulse Width | 1 µs (min) - allows reliable reset triggering via compact mechanical switches or GPIO-driven signals |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive applications per AEC-Q100 stress requirements |
Pinout & Package
ADM825RYRJ-R7 is housed in a 5-lead SOT-23 (RJ-5) package, 2.90 mm × 1.60 mm × 1.15 mm, compliant with JEDEC MO-178-AA. The package supports reflow soldering and provides thermal impedance of 270°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull output - asserts low when VCC < 2.63 V, MR pulled low, or during reset timeout; sinks 1.2 mA @ VCC = 2.7 V |
| 2 | GND | Ground reference - common return path for internal comparators, reset generator, and MR pull-up |
| 3 | RESET | Active-high push-pull output - complements Pin 1; drives high under same assertion conditions; sources 150 µA @ VCC ≥ 1.8 V |
| 4 | VCC | Monitored supply input - powers internal circuitry and serves as reference for reset threshold and MR logic levels |
| 5 | MR | Manual reset input - active-low, internally pulled up to VCC via 52 kΩ; triggers reset on ≥1 µs low pulse; rejects <100 ns glitches |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset outputs | Simultaneous active-low and active-high signals eliminate level-shifting components and simplify interface to diverse MCU reset architectures |
| Automotive-grade temperature range | −40°C to +125°C operation with guaranteed parametric performance - suitable for powertrain and chassis control modules |
| Internal MR pull-up | 52 kΩ on-chip resistor removes need for external biasing, reducing BOM count and PCB footprint in space-constrained designs |
| Low-voltage valid reset | Outputs remain functional down to VCC = 1 V - ensures fail-safe behavior during catastrophic supply collapse before shutdown |
| Glitch-immune reset comparator | Rejects fast VCC transients ≤100 ns - prevents spurious resets in electrically noisy environments like motor drive subsystems |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance System (ADAS) Camera Module |
|---|---|
Use Scenario: Monitors 3.3 V supply rail powering MCU and CAN transceiver during cold cranking, where battery dips to 6 V causing regulator output sag. IC Role / Device Role / Timing Role: Supervisory circuit asserting synchronized RESET and RESET to halt CPU execution and hold peripheral clocks until stable voltage resumes. Use Value: Prevents corrupted flash writes and CAN bus arbitration errors by enforcing 140 ms minimum reset hold time after VCC recovers above 2.63 V. |
Use Scenario: Ensures clean boot sequence for image signal processor (ISP) after wake-from-sleep triggered by radar detection. IC Role / Device Role / Timing Role: Manual reset input (MR) accepts GPIO-initiated reset pulse to force ISP reinitialization without full power cycle. Use Value: Enables deterministic recovery from ISP lockup using 1 µs MR pulse - avoids 100+ ms system-level reboot delay and maintains real-time response. |
| Industrial PLC I/O Module | Automotive Infotainment Head Unit |
Use Scenario: Supervises isolated 3.3 V domain feeding FPGA configuration memory and ADC front-end in harsh factory-floor environment. IC Role / Device Role / Timing Role: Dual push-pull outputs drive FPGA PROG_B (active-low) and ADC RESET (active-high) simultaneously from single device. Use Value: Reduces component count by replacing two discrete supervisors; eliminates timing skew between FPGA and ADC reset deassertion. |
Use Scenario: Provides fail-safe reset coordination between application processor, audio codec, and display controller during ignition-on power ramp. IC Role / Device Role / Timing Role: Reset threshold set to 2.63 V matches 2.8 V LDO dropout margin, ensuring reset assertion before logic voltage violates VIH/VIL specs. Use Value: Guarantees all subsystems enter known state before software begins clock tree configuration - prevents metastability in multi-domain SoC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326T26D3+T | Single active-low open-drain output; requires external pull-up; 2.63 V threshold; 200 ms timeout | Lacks dual-output capability and MR debounce; no guaranteed reset validity below 1.2 V | Choose when board space permits external resistor and only one reset polarity is needed |
| TPS3808G33DBVR | Active-low push-pull output only; 3.08 V threshold; 200 ms timeout; includes watchdog timer | Includes watchdog (not present in ADM825RYRJ-R7); higher threshold unsuitable for 2.7 V–3.3 V rails | Choose when watchdog monitoring is required and system operates at ≥3.0 V nominal supply |
Compared with MAX6326T26D3+T and TPS3808G33DBVR, ADM825RYRJ-R7 uniquely delivers dual-polarity reset signaling in a single SOT-23 package with automotive temperature support and sub-1 V reset validity - making it optimal for space-constrained, safety-critical 2.7 V–3.3 V systems requiring deterministic multi-rail coordination.
Availability
ADM825RYRJ-R7 is available at Aetrix Electronics and suitable for engine control units, ADAS camera modules, industrial PLC I/O modules, and automotive infotainment head units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM825RYRJ-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 industrial, automotive, communications, and healthcare markets since 1965.
The ADM825 is part of Analog Devices' precision supervisory IC product line, engineered specifically for deterministic power-on reset, brownout protection, and manual recovery in automotive and industrial microprocessor systems.
FAQ
What is the exact reset threshold voltage of ADM825RYRJ-R7 and how does it vary with temperature?
The ADM825RYRJ-R7 has a nominal reset threshold of 2.63 V at 25°C, with tolerance of ±45 mV across the full −40°C to +125°C operating range. Its temperature coefficient is specified at 40 ppm/°C, meaning drift is tightly controlled and predictable - critical for maintaining accurate brownout detection in under-hood automotive environments where ambient temperature swings exceed 160°C.
Does ADM825RYRJ-R7 include a watchdog timer function?
No, ADM825RYRJ-R7 does not include a watchdog timer. Per Table 1 and the General Description section of the datasheet, the ADM825 variant is defined by its manual reset input (MR) and dual push-pull outputs (RESET and RESET), with no watchdog input (WDI) pin or associated timing circuitry. This distinguishes it from the ADM823 and ADM824 families, which integrate watchdog functionality.
What are the electrical characteristics of the MR input on ADM825RYRJ-R7?
The MR input on ADM825RYRJ-R7 is active-low with an internal 52 kΩ pull-up to VCC. It requires a minimum pulse width of 1 µs to trigger reset, rejects transients shorter than 100 ns, and has logic thresholds of 0.3×VCC (VIH) and 0.7×VCC (VIL). These specifications ensure robust manual reset initiation using simple push-buttons or microcontroller GPIOs without external conditioning circuitry.
Can ADM825RYRJ-R7 operate reliably at VCC = 1.0 V?
Yes, ADM825RYRJ-R7 guarantees valid reset output states down to VCC = 1.0 V. Both RESET (active-low) and RESET (active-high) outputs remain functional - sinking 50 µA at 0.3 V and sourcing 150 µA at 0.8×VCC respectively - enabling fail-safe behavior during deep undervoltage events that precede complete power loss in automotive and battery-powered systems.
What package type and dimensions does ADM825RYRJ-R7 use?
ADM825RYRJ-R7 uses the 5-lead SOT-23 (RJ-5) package per JEDEC MO-178-AA, measuring 2.90 mm × 1.60 mm × 1.15 mm. Its pinout is standardized: Pin 1 = RESET, Pin 2 = GND, Pin 3 = RESET, Pin 4 = VCC, Pin 5 = MR. This compact, surface-mount package supports automated assembly and delivers 270°C/W thermal impedance for reliable operation in thermally dense automotive PCB layouts.
ADM825RYRJ-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:
- 2.63V
- 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
ADM825RYRJ-R7 FAQ
1.How can I place an order for ADM825RYRJ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM825RYRJ-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 ADM825RYRJ-R7 reliable?
The price and inventory of ADM825RYRJ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM825RYRJ-R7 is usually 5 days.
3.What payment methods are accepted for ADM825RYRJ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM825RYRJ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM825RYRJ-R7?
ADM825RYRJ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM825RYRJ-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 ADM825RYRJ-R7?
For technical support, including ADM825RYRJ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM825RYRJ-R7 requirements.
6.How does Aetrix verify that ADM825RYRJ-R7 is sourced from the original manufacturer or authorized distributors?
All ADM825RYRJ-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 ADM825RYRJ-R7 meets industry standards.
7.What is the process for return or replacement of ADM825RYRJ-R7?
All ADM825RYRJ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM825RYRJ-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 ADM825RYRJ-R7 part is unused and in its original packaging.
Return procedure for ADM825RYRJ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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