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Texas Instruments MCP809M3-2.93/NOPB
- Part No.:
- MCP809M3-2.93/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MCP809M3-2.93/NOPB.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP809M3-2.93/NOPB from Texas Instruments is a 3-pin active-low microprocessor reset supervisor IC designed to monitor 3.3V supply rails in embedded systems. It asserts a precise 2.93V ±3% reset threshold over −40°C to +105°C, delivers a guaranteed 140ms minimum power-on reset pulse (240ms typical), and maintains valid RESET output down to VCC ≥1V with only 15µA typical supply current.
For engineers reviewing the MCP809M3-2.93/NOPB datasheet, MCP809M3-2.93/NOPB pinout, MCP809M3-2.93/NOPB application, or MCP809M3-2.93/NOPB equivalent, key selection criteria include factory-trimmed voltage accuracy, SOT-23-3 package compatibility, brown-out immunity, transient rejection up to 100mV/20µs, and operation across industrial temperature range without external components.
Technical Context
The MCP809M3-2.93/NOPB integrates a precision voltage reference, comparator, and reset timer in a monolithic CMOS design. Its reset assertion logic triggers when VCC falls below 2.93V (±3% over temperature), and holds RESET low for ≥140ms after VCC rises above threshold - ensuring reliable microprocessor initialization during power-up, brown-out, or power-down events.
It features built-in immunity to negative-going VCC transients (e.g., 100mV glitches ≤20µs at +25°C), operates with VCC as low as 1.2V (−40°C to +105°C), and guarantees VOL ≤0.4V at ISINK = 3.2mA - enabling direct interface with standard CMOS inputs without pull-up resistors under normal operating conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±3% over −40°C to +105°C - ensures accurate 3.3V supply monitoring with <10% margin below nominal rail |
| Power-On Reset Pulse Width | 140ms min / 240ms typical - meets ARM, PIC, and x86 processor reset timing requirements |
| Supply Current | 15µA typical at +25°C - enables use in battery-powered systems with multi-year standby life |
| VCC Operating Range | 1.2V to 5.5V - supports operation during deep brown-out and allows system-level power sequencing |
| RESET Output Type | Active-low open-drain - compatible with standard microcontroller reset pins requiring low-active assertion |
| Output Sink Capability | 3.2mA at VOL ≤0.4V - drives multiple CMOS inputs or RC networks without external buffer |
| Temperature Range | −40°C to +105°C - qualified for industrial and automotive under-hood applications |
Pinout & Package
Package: SOT-23-3 (DBZ), 1.12mm max height, JEDEC TO-236 compliant, RoHS-compliant matte tin (Sn) lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-low) | Open-drain output asserted low during reset; requires external pull-up for high state; sinks up to 3.2mA |
| 2 | VCC | Positive supply input (1.2–5.5V); powers internal circuitry and serves as voltage reference for threshold detection |
| 3 | GND | Analog ground reference; must be connected directly to system ground plane for stable threshold accuracy |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.93V threshold | Factory-trimmed ±3% tolerance over full temperature range eliminates need for external calibration or trimming resistors |
| Guaranteed 140ms reset timeout | Internally timed minimum pulse width ensures all microprocessors complete internal initialization before release |
| VCC ≥1V RESET validity | Output remains functional down to 1.2V supply - critical for orderly shutdown and brown-out recovery sequences |
| Transient immunity | Rejects VCC glitches ≤100mV amplitude and ≤20µs duration - prevents spurious resets in noisy power environments |
| Low 15µA quiescent current | Enables integration into always-on subsystems (e.g., RTC, wake-on-LAN) without measurable battery drain |
Applications
| Industrial PLC Controllers | Automotive Body Control Modules |
|---|---|
Use Scenario: Power supply monitoring during cold-cranking and load-dump events in 12V vehicle electrical systems. IC Role / Device Role / Timing Role: Active-low reset supervisor asserting RESET during VCC dip below 2.93V and holding for ≥140ms post-recovery. Use Value: Prevents microcontroller lockup during engine start by guaranteeing clean reset initiation even with 3.3V rail sag to 2.7V. | Use Scenario: Supervising 3.3V domain powering CAN transceivers and sensor interfaces in body electronics. IC Role / Device Role / Timing Role: Voltage monitor with industrial-grade temperature stability (−40°C to +105°C) and transient immunity. Use Value: Maintains deterministic reset behavior across thermal cycling and EMI-rich cabin environments without external filtering. |
| Portable Medical Devices | Smart Energy Meters |
Use Scenario: Ensuring reliable boot sequence in battery-powered glucose monitors with Li-ion supply ranging 3.0–4.2V. IC Role / Device Role / Timing Role: Low-current (15µA) supervisor enabling >5-year shelf life while providing precise 2.93V brown-out detection. Use Value: Eliminates false resets during battery voltage decay and extends usable battery capacity by avoiding premature shutdown. | Use Scenario: Monitoring auxiliary 3.3V supply for metrology ASIC and real-time clock in ANSI C12.20-certified meters. IC Role / Device Role / Timing Role: High-accuracy reset generator with 30ppm/°C tempco and validated operation at 105°C ambient. Use Value: Guarantees meter firmware integrity during summer rooftop installations where enclosure temperatures exceed 85°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | 3.3V threshold, 200ms fixed delay, 2.5µA IQ, SOT-23-6 | Requires external capacitor for delay tuning; higher pin count; lower quiescent current | Select when ultra-low power (<5µA) is prioritized over pin count and cost |
| MAX809TRD3T | 2.93V threshold, 140ms min delay, 12µA IQ, SOT-23-3 | Same footprint and threshold; slightly lower IQ but no transient immunity spec published | Select when matching footprint and threshold is critical and transient environment is benign |
Compared with TPS3808G33DBVR and MAX809TRD3T, the MCP809M3-2.93/NOPB offers identical SOT-23-3 pinout and factory-trimmed 2.93V threshold with documented 100mV/20µs transient immunity - making it optimal for cost-sensitive industrial designs requiring proven noise robustness without layout changes.
Availability
MCP809M3-2.93/NOPB is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, portable medical devices, smart energy meters, and battery-backed real-time systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MCP809M3-2.93/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 personal electronics markets.
The MCP809 series belongs to TI's precision voltage supervisor product line, engineered specifically for reliable power-on reset generation and brown-out protection in resource-constrained microprocessor systems operating across harsh environmental conditions.
FAQ
What is the exact reset threshold voltage of the MCP809M3-2.93/NOPB and how does it vary with temperature?
The MCP809M3-2.93/NOPB has a factory-programmed reset threshold of 2.93V with ±3% tolerance over −40°C to +105°C. At +25°C, the typical value is 2.93V (min 2.89V, max 2.96V); at −40°C to +85°C, it ranges 2.85V to 3.00V; and at +85°C to +105°C, it shifts to 2.78V to 3.08V. The temperature coefficient is 30ppm/°C, meaning drift is predictable and bounded within datasheet limits - critical for deterministic system behavior in thermal cycling environments. This specification applies exclusively to the MCP809M3-2.93/NOPB.
Does the MCP809M3-2.93/NOPB require external components to function in a standard microprocessor reset application?
No, the MCP809M3-2.93/NOPB operates autonomously with only VCC, GND, and RESET connections. A pull-up resistor on the active-low RESET pin is recommended only if the driven microcontroller lacks internal pull-up or if RESET must remain defined below VCC = 1V - per TI Application Note SNVS165A, a 100kΩ resistor to GND satisfies this edge case. No capacitors, resistors, or trimming components are needed for basic reset supervision of 3.3V supplies. This self-contained operation is intrinsic to the MCP809M3-2.93/NOPB design.
How does the MCP809M3-2.93/NOPB handle power supply transients, and what is its maximum tolerable glitch duration?
The MCP809M3-2.93/NOPB provides documented immunity to negative-going VCC transients: a 100mV dip below the 2.93V threshold will not trigger reset if duration is ≤20µs at +25°C. Immunity degrades predictably with deeper transients - e.g., 200mV dips tolerate only ~5µs. This behavior is verified in Figure 10 of the SNVS165A datasheet and results from internal filtering and comparator hysteresis. Adding a 0.1µF ceramic capacitor near the VCC pin further enhances rejection. This transient resilience is a specified feature of the MCP809M3-2.93/NOPB.
Can the MCP809M3-2.93/NOPB be used with microcontrollers that have bidirectional reset pins, such as the Motorola 68HC11?
Yes, the MCP809M3-2.93/NOPB can interface with bidirectional reset pins using a 4.7kΩ series resistor between its open-drain RESET output and the µP pin, as shown in Figure 11 of SNVS165A. This resistor prevents contention when the microcontroller drives the line high while MCP809M3-2.93/NOPB holds it low, ensuring correct logic states during both reset assertion and release. The resistor value balances noise immunity and rise time - a design detail confirmed for the MCP809M3-2.93/NOPB in TI's official application guidance.
What is the minimum VCC voltage at which the MCP809M3-2.93/NOPB guarantees valid RESET output behavior?
The MCP809M3-2.93/NOPB guarantees RESET output functionality down to VCC ≥1V, as stated in the "Specified RESET Output Valid for VCC≥1V" feature list and confirmed in Electrical Characteristics tables. Below 1V, the output enters high-impedance state and may float; above 1V, VOL remains ≤0.4V at 3.2mA sink current and VOH exceeds 0.8×VCC when sourcing 500µA. This 1V operational floor enables controlled shutdown sequencing in systems where main supply collapses gradually - a defined operating limit unique to the MCP809M3-2.93/NOPB.
MCP809M3-2.93/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:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- 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
MCP809M3-2.93/NOPB FAQ
1.How can I place an order for MCP809M3-2.93/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP809M3-2.93/NOPB 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 MCP809M3-2.93/NOPB reliable?
The price and inventory of MCP809M3-2.93/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP809M3-2.93/NOPB is usually 5 days.
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Once your MCP809M3-2.93/NOPB 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 MCP809M3-2.93/NOPB?
For technical support, including MCP809M3-2.93/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP809M3-2.93/NOPB requirements.
6.How does Aetrix verify that MCP809M3-2.93/NOPB is sourced from the original manufacturer or authorized distributors?
All MCP809M3-2.93/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 MCP809M3-2.93/NOPB meets industry standards.
7.What is the process for return or replacement of MCP809M3-2.93/NOPB?
All MCP809M3-2.93/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with MCP809M3-2.93/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 MCP809M3-2.93/NOPB part is unused and in its original packaging.
Return procedure for MCP809M3-2.93/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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