PTLV803EA29DBZR Texas Instruments Integrated Circuit (SOT23 (3-Pin)) In Stock
PTLV803EA29DBZR is a low-power 3-pin voltage supervisor and reset IC from Texas Instruments with a fixed 2.9 V threshold and an active-low open-drain reset output. It monitors the system supply rail and asserts the RESET pin low whenever the supply drops below the 2.9 V threshold, holding the processor in reset until the supply recovers and a built-in timeout delay expires. Packaged in a miniature SOT-23-3 for minimal board space in microcontroller-based embedded systems.
- Manufacturer
- Texas Instruments
- Package
- SOT23 (3-Pin)
- Pin Count
- 3
- Lifecycle
- OBSOLETE
- Datasheet
- PTLV803EA29DBZR Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of PTLV803EA29DBZR?
- Fixed 2.9 V threshold with active-low open-drain reset output for direct connection to MCU reset inputs
- Ultra-low quiescent current extends battery life in always-on supervisory circuits
- Built-in power-on reset timeout delay ensures supply stabilization before MCU is released from reset
- 3-pin SOT-23 package minimizes PCB footprint for space-constrained embedded and IoT designs
What is PTLV803EA29DBZR used for?
PTLV803EA29DBZR provides reliable power-on and brownout reset supervision for 3.3 V microcontroller systems in industrial sensors, home automation nodes, and battery-powered IoT edge devices where accidental execution of code during voltage droops can corrupt memory or cause system lockups. Its open-drain output supports wired-OR reset bus architectures where multiple supervisory sources share a single MCU reset pin. The device also suits always-on standby circuits that must detect power-good conditions in energy-harvesting and supercapacitor-backed systems.
What are the specifications of PTLV803EA29DBZR?
| Date Of Intro | 2019-06-14 |
| YTEOL | 0 |
| Adjustable Threshold | NO |
| Analog IC - Other Type | VOLTAGE SUPERVISOR/RESET IC |
| JESD-30 Code | R-PDSO-G3 |
| Number of Channels | 1 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Supply Voltage-Max (Vsup) | 6V |
| Supply Voltage-Min (Vsup) | 1.7V |
| Supply Voltage-Nom (Vsup) | 3.3V |
| Surface Mount | YES |
| Temperature Grade | AUTOMOTIVE |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.95mm |
| Terminal Position | DUAL |
| Threshold Voltage-Nom | +2.93V |
| Package | SOT23 (3-Pin) |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Where can I find the PTLV803EA29DBZR datasheet?
PTLV803EA29DBZR Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for PTLV803EA29DBZR?
Compatible alternatives and drop-in replacements for PTLV803EA29DBZR:
Frequently Asked Questions
At what supply voltage does PTLV803EA29DBZR assert the reset signal, and for how long does it hold reset active?
PTLV803EA29DBZR monitors the VCC rail and drives the active-low open-drain RESET output low whenever VCC falls below its fixed 2.9 V threshold. After VCC recovers above 2.9 V, an internal timeout delay — typically 200 ms — keeps RESET asserted until the supply has fully stabilized, preventing the MCU from starting execution before its power rail is within specification.
How does the open-drain reset output of PTLV803EA29DBZR enable multi-supervisor reset architectures?
The active-low open-drain output allows multiple PTLV803 devices — or other open-drain supervisors monitoring different rails — to connect their RESET outputs together to a single MCU reset pin with one pull-up resistor. Any single supervisor can pull the shared line low to assert reset without requiring isolation diodes, which simplifies multi-rail power sequencing designs where a 3.3 V, 1.8 V, and 1.2 V rail must all be valid before the processor starts.
For a 3.3 V STM32 MCU application, why would a designer choose a fixed-threshold supervisor like PTLV803EA29DBZR over an adjustable-threshold part?
A fixed 2.9 V threshold supervisor eliminates the 2-resistor voltage divider needed by adjustable parts, saving 2 BOM components and reducing the potential for resistor-tolerance-induced threshold drift. For standard 3.3 V MCU rails where the minimum operating voltage is well-characterized at 2.0 V to 2.7 V, the fixed 2.9 V threshold provides an adequate safety margin without any external calibration, making PTLV803EA29DBZR the simpler and lower-risk choice in volume production.
Can PTLV803EA29DBZR supervise a coin-cell-powered IoT sensor running at 3 V nominal supply?
Yes. PTLV803EA29DBZR's 2.9 V trip threshold is 100 mV below a fresh 3 V CR2032 coin cell voltage, providing a narrow but functional supervision window. As the coin cell discharges from 3.0 V toward end-of-life at approximately 2.7 V to 2.8 V, the supervisor will assert reset before the MCU's minimum operating voltage of 1.8 V to 2.0 V is reached, preventing erratic operation on a collapsing supply and ensuring a clean shutdown with at least 200 mV of margin remaining on the cell.
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Why Buy from FindMyChip
About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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