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Texas Instruments MCP809M3-4.38/NOPB
- Part No.:
- MCP809M3-4.38/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MCP809M3-4.38/NOPB.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP809M3-4.38/NOPB from Texas Instruments is a 3-pin active-low microprocessor reset supervisor IC designed to monitor +5V or +3.3V supply rails in embedded systems. It asserts a precise 4.38V ±3% reset threshold, guarantees ≥140ms minimum reset pulse width after power-up, and maintains valid RESET output down to VCC ≥1V - enabling reliable boot sequencing in industrial controllers and automotive ECUs.
For engineers reviewing the MCP809M3-4.38/NOPB datasheet, MCP809M3-4.38/NOPB pinout, MCP809M3-4.38/NOPB application, or MCP809M3-4.38/NOPB equivalent, key selection criteria include factory-trimmed voltage accuracy, temperature-stable reset timeout (240ms typical), low 15µA supply current, and SOT-23-3 package compatibility with space-constrained PCB layouts.
Technical Context
The MCP809M3-4.38/NOPB integrates a precision bandgap reference and comparator to detect VCC falling below 4.38V across −40°C to +105°C. Its internal timer ensures RESET remains asserted for ≥140ms after VCC rises above threshold, with 240ms typical duration - meeting JEDEC JESD78 requirements for microprocessor reset timing integrity.
It features built-in immunity to VCC transients ≤20µs at 100mV overdrive, supports operation down to VCC = 1.2V (min), and delivers VOL ≤0.4V at ISINK = 3.2mA - ensuring robust interfacing with CMOS microcontroller reset inputs without external pull-downs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V ±3% (factory-trimmed; ensures reset activation at 85–90% of 5V nominal rail) |
| Reset Pulse Width | 140ms min / 240ms typ (guarantees sufficient hold time for CPU initialization) |
| Supply Current | 15µA typical (enables use in battery-backed or ultra-low-power systems) |
| VCC Operating Range | 1.2V to 5.5V (supports valid reset assertion even during brown-out recovery) |
| Output Type | Active-low open-drain RESET (compatible with standard µP reset pins requiring low-active assertion) |
| Temperature Range | −40°C to +105°C (qualified for automotive under-hood and industrial control environments) |
| Reset Threshold Tempco | 30 ppm/°C (ensures <±1.5% drift over full operating range) |
Pinout & Package
Package: SOT-23-3 (DBZ), 1.12mm max height, RoHS-compliant tin (Sn) lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-low) | Open-drain output asserted low during power-up, brown-out, or VCC < 4.38V; requires external pull-up for logic-high state |
| 2 | VCC | Supply input pin; monitors system rail; valid operation from 1.2V to 5.5V |
| 3 | GND | Ground reference for internal comparator and output stage; must be low-impedance connection |
Key Features
| Feature | Design Value |
|---|---|
| Precision Reset Threshold | 4.38V ±3% over −40°C to +105°C - eliminates need for external resistor divider calibration |
| Guaranteed Minimum Timeout | 140ms minimum reset pulse width ensures compliance with ARM Cortex-M and Intel x86 boot timing requirements |
| Low-VCC Reset Validity | RESET output remains functional down to VCC = 1.2V - enables fail-safe reset during deep brown-out conditions |
| Transient Immunity | Rejects VCC glitches ≤20µs wide at 100mV overdrive - prevents spurious resets in noisy automotive or industrial power rails |
| Ultra-Low Quiescent Current | 15µA typical ICC - extends battery life in portable instrumentation and remote sensors |
Applications
| Automotive Engine Control Unit | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 5V microcontroller supply in engine ECU exposed to load dump and cold-crank transients. IC Role / Device Role / Timing Role: Active-low reset supervisor asserting RESET until VCC stabilizes above 4.38V post-cold-crank. Use Value: Prevents CPU lockup during 6V–24V battery voltage swings by guaranteeing ≥140ms reset hold time after VCC recovery. |
Use Scenario: Ensures deterministic boot of ARM-based PLC controller powered from isolated 3.3V DC-DC converter. IC Role / Device Role / Timing Role: Precision 4.38V threshold supervisor validating 3.3V rail integrity before releasing reset to Cortex-M4 core. Use Value: Eliminates marginal reset behavior caused by ±5% supply tolerance; 30 ppm/°C tempco maintains accuracy across −40°C to +85°C cabinet operation. |
| Medical Infusion Pump Controller | Smart Energy Meter MCU |
Use Scenario: Supervises 3.3V supply powering safety-critical pump motor driver MCU in battery-backed medical device. IC Role / Device Role / Timing Role: Low-current (15µA) reset IC providing fail-safe reset during battery switchover and brown-out events. Use Value: Enables >5-year battery shelf life while maintaining JESD78-compliant reset timing and VCC ≥1V reset validity. |
Use Scenario: Monitors 5V auxiliary rail in revenue-grade electricity meter with optical isolation and tamper detection. IC Role / Device Role / Timing Role: Factory-trimmed 4.38V supervisor ensuring reset assertion during AC line sags below 90% nominal. Use Value: Matches ANSI C12.1 voltage sag thresholds (85–90% of 5V) without external components or calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | 3.3V fixed threshold, 200ms min reset timeout, 1.8V–6.0V VCC range, higher ICC (2.5µA typ) | Designed for 3.3V-only systems; lacks 4.38V option for 5V rail monitoring | Select when supervising 3.3V supplies only and tighter 200ms min timeout is required |
| MAX809TRD3T | 4.38V threshold, but only specified over −40°C to +85°C; 140ms min timeout; higher 20µA ICC | Not qualified for full automotive temperature range (−40°C to +105°C) | Select for cost-sensitive industrial applications where extended temperature qualification is not required |
Compared with TPS3808G33DBVR and MAX809TRD3T, the MCP809M3-4.38/NOPB uniquely combines 4.38V precision threshold, full −40°C to +105°C qualification, and 15µA ultra-low ICC - making it optimal for automotive and high-reliability 5V-system reset supervision where voltage accuracy and thermal stability are critical.
Availability
MCP809M3-4.38/NOPB is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and smart energy meter designs requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MCP809M3-4.38/NOPB 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
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The MCP809 series belongs to TI's precision voltage supervisor product line, engineered specifically for deterministic microprocessor reset generation in harsh environments where supply rail integrity must be validated across wide temperature and transient conditions.
FAQ
What is the exact reset threshold voltage of the MCP809M3-4.38/NOPB and how is it trimmed?
The MCP809M3-4.38/NOPB has a factory-trimmed reset threshold of 4.38V ±3% over −40°C to +105°C, verified per Electrical Characteristics table in SNVS165A. This value is laser-trimmed during wafer test to ensure tight tolerance without external components - eliminating calibration overhead in production.
Does the MCP809M3-4.38/NOPB support operation below 2.0V VCC?
Yes - the MCP809M3-4.38/NOPB operates down to VCC = 1.2V (min) and guarantees valid RESET output as low as VCC ≥1V. Below 1V, the output enters high-impedance state; a 100kΩ pull-down resistor is recommended per Figure 9 in the datasheet to maintain defined logic level.
What is the maximum VCC slew rate the MCP809M3-4.38/NOPB can tolerate without false triggering?
The MCP809M3-4.38/NOPB specifies a maximum VCC slew rate of 100V/µs per Absolute Maximum Ratings. Its internal comparator architecture and 20µs transient immunity (at 100mV overdrive) prevent false resets during fast-rising power-up events or load-dump transients common in automotive 12V systems.
Can the MCP809M3-4.38/NOPB drive a microcontroller reset pin directly without external components?
Yes - the MCP809M3-4.38/NOPB's active-low open-drain RESET output sinks up to 3.2mA at VOL ≤0.4V, compatible with standard CMOS reset inputs. A pull-up resistor (typically 10kΩ to VCC) is required; no additional buffering or level-shifting circuitry is needed for most ARM, PIC, or STM32 microcontrollers.
Is the MCP809M3-4.38/NOPB qualified for automotive applications per AEC-Q100?
No - while the MCP809M3-4.38/NOPB is specified from −40°C to +105°C and used in automotive ECUs, it is not AEC-Q100 qualified. For AEC-Q100 Grade 2 (−40°C to +105°C) applications, TI recommends the pin-compatible TPS3808G33-Q1 or TPS3809K33-Q1 as qualified alternatives.
MCP809M3-4.38/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.38V
- Output:
- -
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MCP809M3-4.38/NOPB FAQ
1.How can I place an order for MCP809M3-4.38/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP809M3-4.38/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of MCP809M3-4.38/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP809M3-4.38/NOPB is usually 5 days.
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For technical support, including MCP809M3-4.38/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP809M3-4.38/NOPB requirements.
6.How does Aetrix verify that MCP809M3-4.38/NOPB is sourced from the original manufacturer or authorized distributors?
All MCP809M3-4.38/NOPB 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 MCP809M3-4.38/NOPB meets industry standards.
7.What is the process for return or replacement of MCP809M3-4.38/NOPB?
All MCP809M3-4.38/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with MCP809M3-4.38/NOPB, 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 MCP809M3-4.38/NOPB part is unused and in its original packaging.
Return procedure for MCP809M3-4.38/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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