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Texas Instruments TPS3837K33DBVT
- Part No.:
- TPS3837K33DBVT
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3837K33DBVT.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,940
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Product details
Overview
TPS3837K33 from Texas Instruments is a nano-power voltage supervisor IC designed for precision undervoltage monitoring in battery-powered microcontroller systems. It features a 2.93 V threshold (VIT), active-high push-pull RESET output, 220 nA typical supply current, and selectable 10 ms or 200 ms reset delay via CT pin - enabling reliable power-on and brownout reset for MSP430-based portable instrumentation.
For engineers reviewing the TPS3837K33 datasheet, TPS3837K33 pinout, TPS3837K33 application, or TPS3837K33 equivalent, this device delivers ultra-low quiescent current supervision with precise 3.3 V system compatibility, manual reset capability, and SOT-23-5 packaging suitable for space-constrained, long-life lithium-battery applications requiring deterministic reset timing and minimal power overhead.
Technical Context
The TPS3837K33 implements a comparator-based supervision architecture with internal bandgap reference and hysteresis (40 mV typical) to prevent oscillation near threshold. Its reset assertion logic responds to both VDD falling below 2.93 V and MR pin activation, with independent propagation delays (tPLH = 10 µs typical for VDD→RESET, tPLH = 0.3 µs for MR→RESET).
Reset deassertion requires VDD to exceed VIT + VHYS (~2.97 V) and remain stable for the selected delay time (10 ms or 200 ms), enforced by an internal timer triggered at CT pin configuration - GND for short delay, VDD for long delay. The active-high push-pull output eliminates external pull-up requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage range | 1.6 V to 6 V - supports direct monitoring of Li-ion (3.6 V), LiFePO₄, or regulated 3.3 V rails without external scaling. |
| Threshold voltage (VIT) | 2.93 V (typical), ±1.5% over –40°C to 85°C - ensures accurate 3.3 V system reset initiation at defined undervoltage level. |
| Supply current (IDD) | 220 nA (typical) at VDD > VIT, <450 nA max - enables multi-year operation on coin-cell or primary lithium batteries. |
| Reset delay options | 10 ms (CT = GND) or 200 ms (CT = VDD) - provides design flexibility for MCU boot timing or transient immunity without external RC. |
| Output type | Active-high push-pull RESET - drives high/low directly; no external pull-up resistor required, simplifying BOM and layout. |
| Hysteresis (VHYS) | 40 mV (typical) - prevents chatter during slow-rising/falling supply edges, ensuring clean, glitch-free reset release. |
| Propagation delay (tPLH) | 10 µs (typical, VDD→RESET); 0.3 µs (MR→RESET) - guarantees fast fault response while supporting low-latency manual reset recovery. |
Pinout & Package
TPS3837K33 is packaged in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for high-density PCB layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power input / monitored supply rail | Primary voltage sense node; device asserts RESET when VDD falls below 2.93 V or rises above it with hysteresis and delay. |
| GND | Ground reference | Analog and digital ground return; must be low-impedance connection to ensure accurate threshold sensing and noise immunity. |
| CT | Delay configuration control | Connect to GND for 10 ms reset delay, or to VDD for 200 ms delay - sets internal timer without external components. |
| MR | Manual reset input (active-low) | Pull low to force immediate RESET assertion; if unused, tie to VDD to minimize leakage current (<100 nA). |
| RESET | Active-high push-pull output | Drives high (≈VDD) when inactive, low (≈0 V) when asserted; interfaces directly with MCU reset inputs without pull-up. |
Key Features
| Feature | Design Value |
|---|---|
| Nano-power operation | 220 nA typical IDD enables >10-year battery life in always-on monitoring applications using CR2032 or BR-type cells. |
| Precision 3.3 V supervision | 2.93 V threshold with ±1.5% tolerance over temperature ensures consistent reset behavior across industrial operating range. |
| Selectably timed reset release | Hardware-configurable 10 ms / 200 ms delay eliminates need for external timing capacitors or firmware-based delays. |
| Active-high push-pull output | Direct drive capability removes external pull-up resistor, reducing component count, board area, and potential failure points. |
| Integrated hysteresis | 40 mV built-in VHYS prevents false resets during supply ramp-up or noise-induced dips near threshold. |
Applications
| Lithium-Ion Battery Monitoring | MSP430-Based Portable Instrumentation |
|---|---|
Use Scenario: Monitors 3.6 V Li-ion battery voltage in handheld test equipment to prevent MCU operation below safe operating voltage. IC Role / Device Role / Timing Role: Voltage supervisor providing power-on reset and brownout detection with 200 ms delay to ignore brief load transients. Use Value: Ensures deterministic system initialization and prevents data corruption or flash write errors during low-voltage conditions. |
Use Scenario: Provides controlled reset sequencing for MSP430FR5969 in wireless sensor nodes powered by primary lithium cells. IC Role / Device Role / Timing Role: Nano-power supervisor generating active-high reset signal synchronized to VDD stability and manual override. Use Value: Extends battery service life beyond 5 years while guaranteeing reliable wake-from-hibernate recovery. |
| Low-Power Industrial Data Loggers | Medical Wearable Devices |
Use Scenario: Supervises regulated 3.3 V supply in battery-backed environmental data loggers deployed in remote locations. IC Role / Device Role / Timing Role: Precision threshold detector with 10 ms delay for fast power-fail response during mains loss events. Use Value: Enables safe shutdown and nonvolatile memory save before supply collapse, preserving critical measurement history. |
Use Scenario: Ensures fail-safe reset of ARM Cortex-M0+ MCU in FDA-cleared wearable ECG monitors using CR2032 coin cells. IC Role / Device Role / Timing Role: Ultra-low-current supervisor with active-high output compatible with medical-grade reset controllers. Use Value: Meets IEC 62304 Class B software safety requirements through deterministic, hardware-enforced reset behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3836K33 | Active-low push-pull RESET output; identical threshold (2.93 V), delay options, and quiescent current. | Requires MCU reset pin configured for active-low assertion; no pull-up needed but incompatible with active-high reset inputs. | Select when interfacing with legacy MCUs or ASICs expecting active-low reset signals. |
| TPS3838K33 | Active-low open-drain RESET output; same threshold and delay options, but requires external pull-up resistor. | Enables wired-OR reset bus configurations and level translation; higher effective IDD due to pull-up current. | Choose for multi-source reset arbitration or mixed-voltage system designs needing flexible output voltage referencing. |
Compared with TPS3836K33 and TPS3838K33, the TPS3837K33 uniquely provides active-high push-pull output - eliminating external components while ensuring direct compatibility with modern low-voltage MCUs that specify active-high reset inputs, thereby reducing BOM cost and improving layout reliability.
Availability
TPS3837K33 is available at Aetrix Electronics and suitable for lithium-battery-powered instrumentation, MSP430-based sensor nodes, and medical wearables requiring stable component supply, long-term lifecycle support, and guaranteed nano-power performance.
Supply support for TPS3837K33 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 delivering analog and embedded processing solutions, with leadership in low-power design, precision analog, and industrial-grade reliability.
The TPS383x family was developed specifically for ultra-low-power voltage supervision in battery-critical applications - targeting portable instrumentation, wearables, and energy-harvesting systems where nanoscale current consumption and deterministic reset timing are mandatory.
FAQ
What is the exact reset threshold voltage of the TPS3837K33?
The TPS3837K33 has a nominal threshold voltage (VIT) of 2.93 V, with a guaranteed range of 2.84 V to 2.99 V over –40°C to 85°C. This value is factory-trimmed and specified in the Electrical Characteristics table of the SLVS292F datasheet, making it suitable for precise 3.3 V system supervision without external calibration.
How does the CT pin configure reset delay in the TPS3837K33?
In the TPS3837K33, the CT pin selects reset delay time: connecting CT to GND configures a 10 ms typical delay, while connecting CT to VDD selects a 200 ms typical delay. This hardware-selectable feature replaces external RC timing networks, maintaining accuracy across temperature and voltage without additional components.
Does the TPS3837K33 require an external pull-up resistor on the RESET pin?
No, the TPS3837K33 does not require an external pull-up resistor because it features an active-high push-pull RESET output. The output actively drives high (≈VDD) when inactive and low (≈0 V) when asserted - enabling direct interface with MCU reset inputs without passive components or associated leakage paths.
What is the maximum supply voltage rating for the TPS3837K33?
The TPS3837K33 has an absolute maximum VDD rating of 7 V, with recommended operating range from 1.6 V to 6 V. Operation above 6 V is not advised for sustained use, and transient excursions beyond 7 V may cause permanent damage per the Absolute Maximum Ratings table in SLVS292F.
Can the TPS3837K33 be used with MSP430 microcontrollers?
Yes, the TPS3837K33 is explicitly referenced in TI's documentation for MSP430 applications. Its 2.93 V threshold aligns with 3.3 V MSP430 supply rails, its 220 nA quiescent current preserves battery life, and its active-high RESET output matches common MSP430 reset pin configurations - as confirmed in the Typical Application Circuit section of SLVS292F.
TPS3837K33DBVT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- 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:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 10ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TPS3837K33DBVT FAQ
1.How can I place an order for TPS3837K33DBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3837K33DBVT 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 TPS3837K33DBVT reliable?
The price and inventory of TPS3837K33DBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3837K33DBVT is usually 5 days.
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5.How can I obtain technical support or documentation for TPS3837K33DBVT?
For technical support, including TPS3837K33DBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3837K33DBVT requirements.
6.How does Aetrix verify that TPS3837K33DBVT is sourced from the original manufacturer or authorized distributors?
All TPS3837K33DBVT 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 TPS3837K33DBVT meets industry standards.
7.What is the process for return or replacement of TPS3837K33DBVT?
All TPS3837K33DBVT units undergo pre-shipment inspection (PSI). If there is an issue with TPS3837K33DBVT, 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 TPS3837K33DBVT part is unused and in its original packaging.
Return procedure for TPS3837K33DBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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