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Analog Devices Inc. ADM809LARTZ-REEL7
- Part No.:
- ADM809LARTZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ADM809LARTZ-REEL7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,429
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Product details
Overview
ADM809LARTZ-REEL7 from Analog Devices is a microprocessor supervisory circuit with push-pull active-low RESET output, 4.63 V reset threshold, −40°C to +125°C operating temperature range, and 140–460 ms reset timeout. It monitors VCC down to 1 V and consumes only 17 μA, enabling reliable power-on reset in automotive engine control units and industrial PLCs.
For engineers reviewing the ADM809LARTZ-REEL7 datasheet, ADM809LARTZ-REEL7 pinout, ADM809LARTZ-REEL7 application, or ADM809LARTZ-REEL7 equivalent, key selection criteria include reset threshold accuracy (±2.5% over temperature), SOT-23-3 package compatibility, push-pull drive capability (3.2 mA sink at VTH min), and guaranteed operation down to 1 V VCC.
Technical Context
The ADM809LARTZ-REEL7 integrates a precision voltage comparator with built-in glitch immunity and an internal 240 ms (typical) reset timer. Its reset assertion remains valid even as VCC drops to 1 V, ensuring deterministic behavior during brownout conditions.
It features a fixed 4.63 V reset threshold (L-grade), operates across −40°C to +125°C, and delivers push-pull RESET with 0.4 V max low-level output at 3.2 mA sink current-enabling direct interface to CMOS inputs without external pull-up components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63 V ±2.5% over −40°C to +125°C - ensures reliable detection of 5 V supply undervoltage before microprocessor malfunction. |
| Reset Timeout | 140–460 ms - guarantees sufficient hold time for microprocessor initialization across full temperature range. |
| Supply Current | 17 μA typical at VCC < 3.6 V - enables use in battery-backed or ultra-low-power embedded systems. |
| VCC Operating Range | 1.0 V to 5.5 V - supports reset assertion during deep brownout and allows monitoring of supplies down to 1 V. |
| RESET Output Type | Push-pull active-low - eliminates need for external pull-up resistor and drives CMOS/TTL loads directly. |
| RESET Low Voltage | 0.4 V max at 3.2 mA sink - ensures solid logic-low level compatible with 5 V and 3.3 V microcontrollers. |
| Temperature Range | −40°C to +125°C - qualified for under-hood automotive and industrial control applications. |
Pinout & Package
ADM809LARTZ-REEL7 uses a 3-lead SOT-23 (RT-3) package with gull-wing leads, 1.3 mm body width, and JEDEC TO-236-AB compliance. Thermal impedance is 270°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | 0 V return path for internal comparator and reset generator; must be connected to system ground plane for noise immunity. |
| 2 (RESET) | Active-low push-pull output | Drives low during reset condition; actively pulls high when deasserted - no external pull-up required. |
| 3 (VCC) | Supply voltage input | Monitored power rail; device operates and asserts reset down to 1.0 V on this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | 4.63 V with ±2.5% tolerance over −40°C to +125°C - eliminates need for external trimming in 5 V systems. |
| Ultra-low quiescent current | 17 μA typical - extends battery life in portable instrumentation and remote sensors. |
| Brownout resilience | Valid RESET assertion down to 1.0 V VCC - prevents premature release during slow power-down or supply sag. |
| Glitch-immune comparator | Immune to transients up to 100 mV overdrive for ≤100 μs - rejects switching noise on VCC without false resets. |
| Industrial temperature grade | −40°C to +125°C operation - supports deployment in engine control modules and motor drives without derating. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Programmable Logic Controller (PLC) |
|---|---|
Use Scenario: Monitors 5 V microcontroller supply during cold cranking, where battery voltage sags below 6 V and causes transient dips. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET until VCC stabilizes above 4.63 V and holds for ≥140 ms. Use Value: Prevents ECU firmware corruption by guaranteeing microprocessor remains held in reset during unstable supply conditions. | Use Scenario: Ensures deterministic startup of ARM-based controller after AC/DC power interruption in factory automation equipment. IC Role / Device Role / Timing Role: Generates power-on reset pulse with 240 ms typical timeout to synchronize FPGA configuration and peripheral initialization. Use Value: Eliminates race conditions between clock stabilization, memory initialization, and I/O enable sequencing. |
| Medical Infusion Pump Controller | Railway Signaling Interface Module |
Use Scenario: Maintains safe shutdown state during brief AC line dropout in Class II medical devices powered from isolated DC-DC converters. IC Role / Device Role / Timing Role: Active-low RESET output tied to microcontroller's nRST pin; asserts when 5 V rail falls below 4.63 V. Use Value: Meets IEC 62304 safety requirement for controlled restart after power anomaly without unintended actuation. | Use Scenario: Provides fail-safe reset supervision for dual-redundant microcontrollers in EN 5012x-compliant signaling hardware. IC Role / Device Role / Timing Role: Monitors primary 5 V supply and triggers synchronized reset across both controllers upon undervoltage detection. Use Value: Enables SIL-3 compliant voting logic by ensuring identical reset timing and threshold across redundant channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809LTRD1T-T | 4.63 V threshold, SOT-23-3, open-drain output, 20 μA supply current | Requires external pull-up resistor; less suitable for high-noise environments due to lack of push-pull drive | Select when cost sensitivity outweighs need for robust noise immunity and direct CMOS interfacing. |
| TPS3808G33DBVR | 3.3 V threshold, SOT-23-6, adjustable delay, 1.1 μA quiescent current | Not pin-compatible; requires PCB redesign; optimized for ultra-low-power 3.3 V systems, not 5 V monitoring | Choose only for new designs targeting 3.3 V rails and sub-μA standby power, not as drop-in replacement. |
Compared with MAX809LTRD1T-T, ADM809LARTZ-REEL7 eliminates external components and improves noise margin via push-pull drive; versus TPS3808G33DBVR, it provides correct 5 V threshold and pinout but trades ultra-low current for higher drive strength and proven automotive qualification.
Availability
ADM809LARTZ-REEL7 is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, medical infusion pump controllers, and railway signaling interface modules requiring stable component supply across extended temperature ranges.
Supply support for ADM809LARTZ-REEL7 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, headquartered in Norwood, MA.
The ADM809 series belongs to Analog Devices' microprocessor supervisory product line, designed specifically for deterministic power-on reset, brownout protection, and supply voltage monitoring in harsh-environment embedded systems.
FAQ
What is the reset threshold voltage of the ADM809LARTZ-REEL7?
The ADM809LARTZ-REEL7 has a nominal reset threshold voltage of 4.63 V, with a tolerance of ±2.5% over the full operating temperature range of −40°C to +125°C. This value is specified in Table 1 and Table 3 of the ADM803/ADM809/ADM810 datasheet Rev. I, and corresponds to the "L" grade variant. The threshold remains stable across temperature due to low 30 ppm/°C temperature coefficient.
Does the ADM809LARTZ-REEL7 require an external pull-up resistor on the RESET pin?
No, the ADM809LARTZ-REEL7 does not require an external pull-up resistor because it features a push-pull RESET output. Unlike the open-drain ADM803, the ADM809 actively drives both high and low states. Its RESET pin delivers 0.8×VCC high-level voltage and ≤0.4 V low-level voltage at 3.2 mA sink current, enabling direct connection to standard CMOS microcontroller reset inputs.
What package type and dimensions does the ADM809LARTZ-REEL7 use?
The ADM809LARTZ-REEL7 uses a 3-lead SOT-23 (JEDEC TO-236-AB, package option RT-3) with gull-wing leads. Per Figure 14 in the datasheet, its body dimensions are 2.90 mm × 1.30 mm × 1.02 mm (L × W × H), lead pitch is 0.95 mm, and thermal impedance is 270°C/W. The "Z" suffix confirms RoHS compliance.
Can the ADM809LARTZ-REEL7 operate when VCC drops below 2.0 V?
Yes, the ADM809LARTZ-REEL7 continues to assert RESET reliably down to VCC = 1.0 V, as confirmed in the "VCC OPERATING VOLTAGE RANGE" specification (Table 1). Its internal circuitry remains functional and maintains valid logic levels on the RESET pin even during deep brownout, supporting fail-safe operation in systems with unregulated or sagging supplies.
How does the reset timeout period vary with temperature for the ADM809LARTZ-REEL7?
The ADM809LARTZ-REEL7 reset timeout varies from 140 ms (min) to 460 ms (max) over −40°C to +85°C, and from 100 ms (min) to 840 ms (max) over +85°C to +125°C, per Table 1. This variation is inherent to the internal RC timer and is fully characterized - no external adjustment is needed, and the 240 ms typical value applies at 25°C.
ADM809LARTZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
ADM809LARTZ-REEL7 FAQ
1.How can I place an order for ADM809LARTZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM809LARTZ-REEL7 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 ADM809LARTZ-REEL7 reliable?
The price and inventory of ADM809LARTZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM809LARTZ-REEL7 is usually 5 days.
3.What payment methods are accepted for ADM809LARTZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM809LARTZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM809LARTZ-REEL7?
ADM809LARTZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM809LARTZ-REEL7 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 ADM809LARTZ-REEL7?
For technical support, including ADM809LARTZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM809LARTZ-REEL7 requirements.
6.How does Aetrix verify that ADM809LARTZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADM809LARTZ-REEL7 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 ADM809LARTZ-REEL7 meets industry standards.
7.What is the process for return or replacement of ADM809LARTZ-REEL7?
All ADM809LARTZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM809LARTZ-REEL7, 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 ADM809LARTZ-REEL7 part is unused and in its original packaging.
Return procedure for ADM809LARTZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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