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Texas Instruments TPS3838L30DBVR
- Part No.:
- TPS3838L30DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3838L30DBVR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:9,040
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Product details
Overview
TPS3838L30DBVR from Texas Instruments is a nano-power voltage supervisor IC with active-low open-drain RESET output, 2.64 V threshold voltage (VIT), 220 nA typical supply current, and selectable 10 ms or 200 ms reset delay via CT pin - used for undervoltage monitoring in battery-powered microcontroller systems such as MSP430-based portable instrumentation.
For engineers reviewing the TPS3838L30DBVR datasheet, TPS3838L30DBVR pinout, TPS3838L30DBVR application, or TPS3838L30DBVR equivalent, key selection criteria include its 2.64 V precision supervision threshold, open-drain output requiring external pull-up, SOT-23-5 package compatibility, –40°C to 85°C operating range, and ultra-low quiescent current critical for lithium-ion battery longevity.
Technical Context
The TPS3838L30DBVR implements a precision band-gap referenced comparator with 40 mV hysteresis (VHYS) to prevent oscillation near threshold, and integrates a refresh timer that initiates after VDD exceeds VIT + VHYS. Its manual reset (MR) input provides asynchronous assertion of RESET independent of VDD level.
Reset delay timing is controlled solely by the CT pin: grounded for 10 ms (typical), tied to VDD for 200 ms (typical). The open-drain RESET output requires an external pull-up resistor per TI's recommended operating conditions and supports mixed-voltage interface logic levels up to VDD + 0.3 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage range | 1.6 V to 6 V - supports single-cell Li-ion (3.0–4.2 V), 3.3 V logic rails, and brown-out detection down to 1.6 V. |
| Threshold voltage (VIT) | 2.64 V (typical), ±2.5% over temperature - precisely monitors 3.0 V nominal supplies with 2.56–2.69 V min/max window. |
| Supply current (IDD) | 220 nA (typical) at VDD < 3 V - enables multi-year battery life in always-on sensor nodes and wearables. |
| Reset delay options | 10 ms (CT = GND) or 200 ms (CT = VDD) - configurable debouncing for noisy power rails or slow-rising supplies. |
| Output type | Active-low open-drain - requires external pull-up; enables wired-OR configuration and level-shifting to higher voltage domains. |
| Hysteresis (VHYS) | 40 mV (typical) - prevents chatter during slow VDD transitions near threshold, ensuring clean system reset. |
| Propagation delay (tPHL) | 10 µs (max) - fast response to undervoltage events ensures MCU reset before logic corruption occurs. |
Pinout & Package
TPS3838L30DBVR is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, with exposed pad not electrically connected. Pin 1 is VDD, Pin 2 is GND, Pin 3 is CT, Pin 4 is MR, and Pin 5 is RESET.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power input and monitored supply rail | Primary voltage source; device asserts RESET when VDD falls below 2.64 V (VIT) or rises above it but remains below VIT + 40 mV (VHYS) for insufficient time. |
| GND | Analog and digital reference ground | Return path for internal comparator, timer, and output stage; must be low-impedance to ensure accurate threshold tracking. |
| CT | Reset delay configuration control | Connect to GND for 10 ms delay or to VDD for 200 ms delay; no external capacitor required - timing is internally generated. |
| MR | Manual reset input (active-low) | Asynchronous reset trigger; pulling MR low forces immediate RESET assertion regardless of VDD level; unused MR must tie to VDD to minimize leakage. |
| RESET | Open-drain active-low reset output | Drives low during fault; requires external pull-up resistor (value specified in Recommended Operating Conditions); compatible with 1.8–5.5 V logic interfaces. |
Key Features
| Feature | Design Value |
|---|---|
| Nano-power operation | 220 nA typical IDD extends battery life in always-on applications like IoT sensors and medical patches. |
| Precision 2.64 V threshold | ±2.5% tolerance over –40°C to 85°C ensures reliable 3.0 V supply monitoring without calibration. |
| Selectably timed reset delay | Hardware-configurable 10 ms / 200 ms delay eliminates need for external RC timing networks or firmware delays. |
| Open-drain RESET output | Enables flexible interfacing - supports wired-OR reset buses, level translation, and compatibility with legacy 5 V MCU inputs. |
| Integrated 40 mV hysteresis | Prevents false resets on noisy or slowly ramping supplies without requiring external components. |
Applications
| Portable Medical Sensors | MSP430-Based Data Loggers |
|---|---|
Use Scenario: Continuous glucose monitor powered by coin-cell battery, requiring >5-year operational life with periodic wake-up and BLE transmission. IC Role / Device Role / Timing Role: Voltage supervisor monitoring VDD to assert RESET if battery drops below 2.64 V, preventing corrupted EEPROM writes during brown-out. Use Value: 220 nA quiescent current minimizes standby drain; 200 ms delay (CT = VDD) rejects transient dips during RF transmission bursts. |
Use Scenario: Environmental data logger using MSP430FR5969, sampling temperature/humidity every 10 minutes and storing to FRAM. IC Role / Device Role / Timing Role: Ensures clean power-on initialization and detects end-of-battery-life condition before FRAM write failure. Use Value: Open-drain RESET allows direct connection to MSP430's RST/NMI pin without level-shifter; 2.64 V threshold aligns with 3.0 V LDO dropout margin. |
| Wireless Sensor Nodes | Low-Power Industrial Controllers |
Use Scenario: LoRaWAN node with SX1276 transceiver and STM32L0 MCU, powered by primary lithium thionyl chloride cell. IC Role / Device Role / Timing Role: Supervises main 3.6 V supply and triggers hardware reset before deep discharge damages cell chemistry. Use Value: 10 ms delay (CT = GND) enables fast recovery after brief load-switch transients; 6 V absolute max rating tolerates inductive kickback. |
Use Scenario: DIN-rail mounted PLC I/O module with isolated 3.3 V domain powering ARM Cortex-M4 core and analog front-end. IC Role / Device Role / Timing Role: Monitors post-isolation 3.3 V rail to guarantee deterministic boot sequence and prevent lockup during AC line sags. Use Value: 40 mV hysteresis eliminates chatter on 3.3 V rail with ±5% regulation; SOT-23-5 footprint simplifies layout in space-constrained industrial PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3836L30DBVR | Push-pull active-low RESET output; no external pull-up required; identical VIT (2.64 V), delay options, and quiescent current. | Eliminates pull-up resistor cost and board area; unsuitable where wired-OR reset bus or level translation is needed. | Select TPS3836L30DBVR when board space or BOM count reduction is prioritized and open-drain functionality is unnecessary. |
| MAX6373LUR26T | 2.63 V threshold, 1.6 µA IQQ, fixed 200 ms delay, SOT-23-5, open-drain RESET - higher supply current than TPS3838L30DBVR. | Higher quiescent current limits use in multi-year battery applications; suitable for mains-powered equipment with less stringent current budgets. | Choose MAX6373LUR26T only when TI parts are unavailable and 1.6 µA IQQ is acceptable for the target lifetime. |
Compared with TPS3836L30DBVR, the TPS3838L30DBVR trades push-pull simplicity for open-drain flexibility and interoperability; versus MAX6373LUR26T, it delivers 7× lower quiescent current enabling decade-scale battery operation in ultra-low-power designs.
Availability
TPS3838L30DBVR is available at Aetrix Electronics and suitable for portable medical sensors, MSP430-based data loggers, wireless sensor nodes, low-power industrial controllers, and battery-backed real-time clocks requiring stable component supply across long production lifecycles.
Supply support for TPS3838L30DBVR 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 TPS383x family was designed specifically for ultra-low-power voltage supervision in battery-critical applications - emphasizing nanoscale quiescent current, precision thresholds, and minimal external component count for space-constrained portable systems.
FAQ
What is the exact threshold voltage of the TPS3838L30DBVR and how does it vary with temperature?
The TPS3838L30DBVR has a nominal threshold voltage (VIT) of 2.64 V, with a guaranteed range of 2.56 V to 2.69 V over the full –40°C to 85°C operating temperature range. This corresponds to ±2.5% tolerance, and the normalized threshold voltage drift is characterized in Figure 5 of the datasheet, showing less than 0.2% variation across temperature - sufficient for robust 3.0 V supply monitoring without calibration. The TPS3838L30DBVR uses an internal band-gap reference to maintain this stability.
Does the TPS3838L30DBVR require an external pull-up resistor on the RESET pin?
Yes, the TPS3838L30DBVR features an active-low open-drain RESET output and requires an external pull-up resistor to establish a valid high-level logic state when inactive. TI specifies the recommended pull-up value in the Recommended Operating Conditions table - typically 10 kΩ to 100 kΩ depending on bus capacitance and rise-time requirements. This design enables level-shifting and wired-OR configurations not possible with push-pull variants like the TPS3836L30DBVR. The TPS3838L30DBVR datasheet explicitly states this requirement in Section 9.3.4 and Figure 12 layout example.
How is the reset delay time selected on the TPS3838L30DBVR?
The reset delay time on the TPS3838L30DBVR is selected exclusively by the voltage applied to the CT pin: connecting CT to GND configures a typical 10 ms delay, while connecting CT to VDD selects a typical 200 ms delay. No external capacitor or resistor is needed - timing is generated by an internal oscillator. This hardware-selectable method avoids firmware dependencies and ensures deterministic timing during power-up or brown-out recovery. The TPS3838L30DBVR's CT pin function is documented in Section 6 (Pin Functions) and Section 9.3.3 of the datasheet.
Can the TPS3838L30DBVR monitor supply voltages below 1.8 V?
No, the TPS3838L30DBVR is not specified to operate or supervise below 1.6 V. Its recommended operating supply voltage range is 1.6 V to 6 V, and its 2.64 V threshold is optimized for 3.0 V nominal rails. While the device may power up when VDD exceeds 1.1 V (power-on reset activation point), accurate supervision only occurs above 1.6 V per Recommended Operating Conditions. For sub-1.8 V monitoring, TI offers the TPS383xE18 variant (1.71 V threshold) - the TPS3838L30DBVR itself is not rated for reliable operation below its 1.6 V minimum.
What is the maximum allowable voltage on the VDD pin of the TPS3838L30DBVR?
The absolute maximum rating for the VDD pin of the TPS3838L30DBVR is 7 V, as stated in Section 7.1 (Absolute Maximum Ratings) of the datasheet. Exceeding this voltage - even momentarily - risks permanent damage. The device is designed for operation up to 6 V under recommended conditions, and TI recommends adding transient protection (e.g., TVS diode) if the supply is susceptible to spikes exceeding 7 V. This 7 V limit applies strictly to VDD; other pins have separate ratings (e.g., RESET and MR tolerate VDD + 0.3 V).
TPS3838L30DBVR 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:
- 2.64V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 10ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TPS3838L30DBVR FAQ
1.How can I place an order for TPS3838L30DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3838L30DBVR 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 TPS3838L30DBVR reliable?
The price and inventory of TPS3838L30DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3838L30DBVR is usually 5 days.
3.What payment methods are accepted for TPS3838L30DBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3838L30DBVR transactions.
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4.How is shipping managed for TPS3838L30DBVR?
TPS3838L30DBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3838L30DBVR 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 TPS3838L30DBVR?
For technical support, including TPS3838L30DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3838L30DBVR requirements.
6.How does Aetrix verify that TPS3838L30DBVR is sourced from the original manufacturer or authorized distributors?
All TPS3838L30DBVR 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 TPS3838L30DBVR meets industry standards.
7.What is the process for return or replacement of TPS3838L30DBVR?
All TPS3838L30DBVR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3838L30DBVR, 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 TPS3838L30DBVR part is unused and in its original packaging.
Return procedure for TPS3838L30DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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