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Analog Devices Inc. ADM825SYRJ-R7
- Part No.:
- ADM825SYRJ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
ADM825SYRJ-R7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,785
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Product details
Overview
ADM825SYRJ-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 2.93 V reset threshold (typical), 140 ms minimum reset timeout, guaranteed reset validity down to VCC = 1 V, and operates across −40°C to +125°C. Used in portable controllers and intelligent instruments where brownout resilience and external reset initiation are required.
For engineers reviewing the ADM825SYRJ-R7 datasheet, ADM825SYRJ-R7 pinout, ADM825SYRJ-R7 application, or ADM825SYRJ-R7 equivalent, key selection criteria include its manual reset capability, dual reset output polarity, SC70/SOT-23 package compatibility, automotive temperature range, and low 5 µA quiescent current - all critical for embedded system reliability validation.
Technical Context
The ADM825SYRJ-R7 implements a precision voltage monitor with internal reference and hysteresis (5 mV), coupled with a debounced manual reset input featuring 52 kΩ internal pull-up and 1 µs minimum pulse width. Its dual push-pull RESET/RESET outputs ensure simultaneous active-low and active-high assertion during fault conditions.
No watchdog timer is integrated - unlike ADM823/ADM824 - confirming ADM825's dedicated role in systems requiring manual reset control without code-execution supervision. Reset assertion occurs on VCC drop below 2.93 V (±0.04 V over temperature), MR low assertion, or power-up sequencing, with fixed 140 ms timeout after recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93 V (typ), 2.85–3.00 V (min/max over −40°C to +125°C) - sets brownout detection point for 3.3 V systems |
| Reset Timeout Period | 140–280 ms - ensures stable post-power-up reset hold time before processor release |
| Supply Current | 5 µA (typ) at VCC = 2.7–3.6 V - enables battery-backed operation in portable equipment |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive and industrial control environments |
| Output Type | Dual push-pull RESET (active-low) and RESET (active-high) - eliminates need for external inverters or pull resistors |
| VCC Validity Range | Reset outputs guaranteed valid down to VCC = 1 V - supports graceful shutdown during deep brownout |
| MR Input Threshold | 0.3 × VCC to 0.7 × VCC - compatible with standard CMOS logic levels across full VCC range |
Pinout & Package
ADM825SYRJ-R7 is housed in a 5-lead SOT-23 (RJ-5) package per JEDEC MO-178-AA, with 0.95 mm pitch, 2.90 mm × 1.60 mm footprint, and 1.15 mm height - compatible with standard high-density PCB assembly processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output; asserted when VCC < 2.93 V, MR low, or during power-up sequencing |
| 2 | GND | Ground reference for internal comparators and output drivers; must be low-impedance connection |
| 3 | RESET | Active-high push-pull reset output; complementary to Pin 1, enabling direct interface to processors requiring active-high reset |
| 4 | VCC | Monitored power supply input; operates from 2.7 V to 3.6 V; powers internal circuitry and drives outputs |
| 5 | MR | Manual reset input; active-low, internally pulled up to ~52 kΩ; 1 µs minimum pulse width required for reliable assertion |
Key Features
| Feature | Design Value |
|---|---|
| Dual push-pull reset outputs | Eliminates external level-shifting components and reduces BOM count for mixed-signal processor interfaces |
| Automotive temperature range | Enables deployment in engine control units, ADAS modules, and industrial PLCs without derating |
| Guaranteed reset validity to VCC = 1 V | Ensures deterministic reset behavior during deep undervoltage events, improving system fail-safe integrity |
| Internal 52 kΩ MR pull-up | Removes need for external pull-up resistor, simplifying layout and reducing component count in space-constrained designs |
| 5 µA typical supply current | Extends battery life in portable instrumentation and remote sensor nodes operating on coin cells or energy harvesters |
Applications
| Microprocessor Power Monitoring | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Monitors 3.3 V supply rail in ARM Cortex-M based controller during cold-crank and load-dump transients. IC Role / Device Role / Timing Role: Supervisory circuit asserting dual-polarity reset to prevent processor lockup during voltage sags below 2.93 V. Use Value: Prevents corrupted firmware execution by guaranteeing 140 ms minimum reset pulse width after VCC recovery, meeting ISO 16750-2 transient immunity requirements. |
Use Scenario: Integrated into body control module for reset coordination between MCU and CAN transceiver during ignition cycling. IC Role / Device Role / Timing Role: Manual reset initiator via dashboard service button; dual outputs synchronize reset timing across voltage domains. Use Value: Internal MR pull-up and −40°C to +125°C operation eliminate external biasing and enable field-serviceable reset without disassembly. |
| Portable Medical Instrumentation | Industrial Programmable Logic Controller (PLC) |
Use Scenario: Powers on/off sequence management in handheld glucose meter with lithium coin-cell backup. IC Role / Device Role / Timing Role: Low-current (5 µA) supervisor ensuring valid reset assertion even as main supply decays to 1 V. Use Value: Enables safe shutdown and memory retention during battery depletion, complying with IEC 62304 Class B safety requirements. |
Use Scenario: Embedded in DIN-rail mounted PLC I/O module exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Voltage monitor for 3.3 V FPGA configuration rail; dual outputs drive FPGA PROG_B and global reset simultaneously. Use Value: 2.93 V threshold matches FPGA VCCIO tolerance; automotive-grade qualification ensures 15+ year field reliability in uncooled enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM825SYKSZ-R7 | Identical electrical specs but in 5-lead SC70 (KS-5) package - 2.0 mm × 1.25 mm vs. SOT-23's 2.9 mm × 1.6 mm | Preferred for ultra-dense layouts where board area is constrained more than thermal mass | Select when footprint reduction outweighs thermal dissipation needs; SC70 has higher θJA (146°C/W vs. 270°C/W) |
| MAX6326UT29D3+T | 2.93 V reset threshold, 140 ms timeout, but single active-low open-drain output and no manual reset input | Suitable only for systems lacking external reset buttons and using external pull-up for reset polarity inversion | Choose only if dual-output and MR functionality are unnecessary; lacks ADM825SYRJ-R7's push-pull drive strength and MR integration |
Compared with ADM825SYRJ-R7, ADM825SYKSZ-R7 offers identical supervision performance in a smaller footprint but reduced thermal margin, while MAX6326UT29D3+T sacrifices manual reset and dual-output capability for lower cost and simpler interface - making ADM825SYRJ-R7 optimal for automotive and industrial designs requiring robust, feature-complete reset control.
Availability
ADM825SYRJ-R7 is available at Aetrix Electronics and suitable for automotive engine control units, portable medical devices, and industrial programmable logic controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM825SYRJ-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, Inc. is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control systems.
The ADM825 belongs to Analog Devices' supervisory circuits product line, engineered specifically for microprocessor-based systems requiring reliable power-on reset, brownout protection, and field-serviceable manual reset in harsh environments.
FAQ
What is the reset threshold voltage of the ADM825SYRJ-R7?
The ADM825SYRJ-R7 has a nominal reset threshold of 2.93 V at 25°C, with a guaranteed range of 2.85 V to 3.00 V across the full −40°C to +125°C operating temperature range. This threshold is factory-trimmed and specified with 5 mV hysteresis to prevent chatter during slow VCC transitions. The value is optimized for monitoring 3.3 V supply rails in automotive and industrial applications.
Does the ADM825SYRJ-R7 include a watchdog timer function?
No, the ADM825SYRJ-R7 does not include a watchdog timer. Per the official Analog Devices datasheet Rev. D, only the ADM823 and ADM824 variants integrate a 1.6 sec watchdog timer; the ADM825 is explicitly defined as having manual reset (MR) input and dual push-pull reset outputs but no watchdog input (WDI) pin or associated timing circuitry. Its functional block diagram confirms absence of watchdog detector logic.
What package type is used for the ADM825SYRJ-R7?
The ADM825SYRJ-R7 uses a 5-lead SOT-23 package (JEDEC MO-178-AA, package option RJ-5), measuring 2.90 mm × 1.60 mm with 0.95 mm lead pitch. This surface-mount package supports reflow soldering and is compatible with automated pick-and-place assembly. The "RJ" in the part number explicitly denotes the SOT-23 variant, distinguishing it from the SC70 ("KS") version.
How does the manual reset (MR) input operate on the ADM825SYRJ-R7?
The MR input on the ADM825SYRJ-R7 is an active-low signal with an internal 52 kΩ pull-up resistor. Driving MR below 0.3 × VCC for ≥1 µs asserts both RESET and RESET outputs for the full 140 ms timeout period. When released, the output remains asserted until timeout completes. The integrated debounce and 100 ns glitch rejection ensure noise immunity in electrically noisy environments like automotive harnesses.
Can the ADM825SYRJ-R7 operate with supply voltages below 2.7 V?
No, the ADM825SYRJ-R7 is specified for VCC operation between 2.7 V and 3.6 V only. Below 2.7 V, internal reference and comparator performance is not guaranteed, and reset output validity is no longer assured per datasheet Table 2. While the device may assert reset down to VCC = 1 V, proper supervision functionality - including accurate threshold detection and timeout timing - requires operation within the rated 2.7–3.6 V range.
ADM825SYRJ-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:
- 2.93V
- 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
ADM825SYRJ-R7 FAQ
1.How can I place an order for ADM825SYRJ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM825SYRJ-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 ADM825SYRJ-R7 reliable?
The price and inventory of ADM825SYRJ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM825SYRJ-R7 is usually 5 days.
3.What payment methods are accepted for ADM825SYRJ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM825SYRJ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM825SYRJ-R7?
ADM825SYRJ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM825SYRJ-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 ADM825SYRJ-R7?
For technical support, including ADM825SYRJ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM825SYRJ-R7 requirements.
6.How does Aetrix verify that ADM825SYRJ-R7 is sourced from the original manufacturer or authorized distributors?
All ADM825SYRJ-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 ADM825SYRJ-R7 meets industry standards.
7.What is the process for return or replacement of ADM825SYRJ-R7?
All ADM825SYRJ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM825SYRJ-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 ADM825SYRJ-R7 part is unused and in its original packaging.
Return procedure for ADM825SYRJ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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