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Texas Instruments TPS3839L30DBZT
- Part No.:
- TPS3839L30DBZT
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TPS3839L30DBZT.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,141
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Product details
Overview
TPS3839L30DBZT from Texas Instruments is an ultralow-power voltage supervisor IC designed for supply monitoring in battery-critical systems. It features a factory-trimmed 2.63 V reset threshold, 150 nA typical supply current at 25°C, push-pull RESET output, valid operation down to 0.6 V VDD, and operates across –40°C to +85°C. It is used to ensure reliable power-on reset in glucose monitors and wearables.
For engineers reviewing the TPS3839L30DBZT datasheet, TPS3839L30DBZT pinout, TPS3839L30DBZT application, or TPS3839L30DBZT equivalent, key selection criteria include reset threshold accuracy (±1% at 25°C), transient rejection capability, 200 ms reset delay timing, and SOT-23-3 package compatibility with space-constrained PCB layouts.
Technical Context
The TPS3839L30DBZT implements a precision comparator-based supervision architecture with built-in hysteresis (26 mV typical) to prevent chatter during supply recovery. Its sampling scheme draws only ~15 µA for ~200 µs per cycle, enabling 150 nA average quiescent current while maintaining accurate threshold detection.
It asserts an active-low RESET signal when VDD falls below 2.63 V (VIT–), holds RESET low for 200 ms (typical) after VDD rises above VIT– + Vhys, and remains functional down to 0.6 V VDD - enabling use in single-cell alkaline and Li-ion discharge monitoring where brownout resilience is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63 V (factory-trimmed, ±1% accuracy at 25°C); ensures precise brownout detection for 2.7–3.0 V rail monitoring |
| Supply Current | 150 nA typical at 25°C; enables >10-year battery life in coin-cell-powered wearables |
| Operating Voltage | 0.9 V to 6.5 V input range; supports single-cell alkaline (0.9–1.7 V), Li-ion (2.5–4.2 V), and 3.3/5 V logic rails |
| Reset Delay | 200 ms typical; provides sufficient hold time for microcontroller initialization and peripheral stabilization |
| Output Type | Push-pull RESET; eliminates need for external pull-up resistor and reduces BOM count |
| VDD Valid Output | Valid RESET logic state guaranteed down to 0.6 V VDD; ensures deterministic behavior during deep brownout |
| Hysteresis | 26 mV typical; prevents oscillation during slow-rising or noisy supply recovery |
Pinout & Package
TPS3839L30DBZT is housed in a 3-pin SOT-23 (DBZ) package measuring 2.92 mm × 2.37 mm, optimized for high-density portable PCBs. The package has no thermal pad and uses standard SOT-23 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Accepts 0.9–6.5 V; powers internal circuitry and enables reset assertion when below 2.63 V |
| GND | Ground reference | Return path for internal current; must be low-impedance to avoid false resets during 15 µA sampling pulses |
| RESET | Active-low reset output | Push-pull driver capable of sinking 2 mA; directly interfaces with MCU reset pins without external components |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow supply current | 150 nA typical enables multi-year operation on CR2032 coin cells in glucose meters and wearables |
| Factory-trimmed threshold | 2.63 V ±1% eliminates need for external resistor divider calibration in production |
| Transient rejection | Rejects fast VDD transients ≥20 µs duration and ≥2.564 V amplitude; prevents spurious resets in noisy environments |
| Low-VDD operation | Valid RESET output down to 0.6 V VDD ensures deterministic behavior during deep brownout and battery depletion |
| Push-pull output | Eliminates external pull-up resistor, reducing component count and board area in space-constrained designs |
Applications
| Glucose Monitoring Systems | Wearable Health Trackers |
|---|---|
Use Scenario: Monitors single alkaline cell voltage during discharge to trigger system shutdown before unsafe low-voltage operation. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low RESET when cell drops below 2.63 V, holding reset for 200 ms to guarantee clean MCU restart. Use Value: Prevents data corruption and sensor misreads by enforcing controlled shutdown at 2.63 V, extending usable battery capacity by 8–12% versus fixed 2.5 V thresholds. |
Use Scenario: Ensures reliable boot sequence in wrist-worn devices powered by thin-film or button batteries. IC Role / Device Role / Timing Role: Provides power-on reset with 200 ms delay and 150 nA quiescent draw to minimize standby leakage. Use Value: Enables >5-year shelf life and >2-year operational life on a single CR2025 cell due to sub-200 nA average current consumption. |
| Smart Metering Modules | Industrial Sensor Nodes |
Use Scenario: Supervises backup supercapacitor or primary lithium battery in AMI metering units operating in wide temperature ranges. IC Role / Device Role / Timing Role: Detects VDD drop below 2.63 V across –40°C to +85°C and asserts RESET with 26 mV hysteresis to prevent chatter. Use Value: Guarantees robust reset behavior over full industrial temperature range without external compensation components. |
Use Scenario: Monitors isolated 3.3 V supply derived from energy-harvesting sources in wireless sensor networks. IC Role / Device Role / Timing Role: Acts as supply monitor with 0.9–6.5 V operating range and push-pull output compatible with isolated MCU reset inputs. Use Value: Supports ultra-low-power wake-up sequencing by remaining active at 150 nA while rejecting transients from switching regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3839K33DBZT | Higher 2.93 V reset threshold; same 150 nA current, 200 ms delay, and SOT-23-3 package | Used where 3.3 V rail supervision is required instead of 2.63 V; not interchangeable without circuit validation | Select when supervising 3.0–3.6 V supplies; requires layout verification if replacing TPS3839L30DBZT in existing 2.63 V designs |
| MAX6373XR26-T | 2.63 V threshold, but 1.2 µA typical supply current; SC70-3 package; no hysteresis spec provided | Higher current draw limits battery life in long-duration portable applications; smaller SC70 footprint may require redesign | Consider only for cost-sensitive, non-battery applications where 1.2 µA quiescent current is acceptable |
Compared with TPS3839L30DBZT, TPS3839K33DBZT offers identical performance at a higher threshold, while MAX6373XR26-T trades 8× higher supply current for potentially lower unit cost - making TPS3839L30DBZT optimal for multi-year battery-powered designs requiring precision 2.63 V supervision.
Availability
TPS3839L30DBZT is available at Aetrix Electronics and suitable for glucose monitors, wearable health trackers, smart metering modules, and industrial sensor nodes requiring stable component supply across extended product lifecycles.
Supply support for TPS3839L30DBZT 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 specializing in analog and embedded processing technologies, with leadership in low-power design and precision analog ICs.
The TPS383x family was developed specifically for ultralow-power voltage supervision in battery-operated medical, portable, and industrial equipment - prioritizing nanoscale current consumption and factory-trimmed threshold accuracy.
FAQ
What is the exact reset threshold voltage of the TPS3839L30DBZT?
The TPS3839L30DBZT has a factory-trimmed negative-going threshold voltage (VIT–) of 2.63 V, with ±1% accuracy at 25°C and 26 mV typical hysteresis. This value is confirmed in the Electrical Characteristics table of the SBVS193D datasheet and applies specifically to the L30 variant in DBZ packaging.
Does the TPS3839L30DBZT support operation below 1.0 V supply voltage?
Yes, the TPS3839L30DBZT guarantees valid RESET output logic state down to 0.6 V VDD, and its recommended operating range starts at 0.9 V. It remains functional and asserts RESET correctly even during deep brownout conditions common in single-cell alkaline discharge profiles.
What is the reset delay time for the TPS3839L30DBZT, and is it adjustable?
The TPS3839L30DBZT has a fixed reset delay time (td) of 200 ms typical, with a range of 120–350 ms across temperature and voltage. This delay is internally generated and not user-adjustable; it ensures sufficient hold time for microcontroller and peripheral initialization after power recovery.
Can the TPS3839L30DBZT be used with a bidirectional reset pin on a microcontroller?
Yes, but a series resistor (typically 1–10 kΩ) must be placed between the TPS3839L30DBZT RESET pin and the MCU's bidirectional reset pin to prevent contention current when both devices attempt to drive the line simultaneously - as specified in Section 9.2.2.2 of the SBVS193D datasheet.
Is a bypass capacitor required for stable operation of the TPS3839L30DBZT?
Yes, TI recommends a 0.1 µF ceramic bypass capacitor placed close to the VDD pin. This mitigates voltage droop caused by the device's periodic 15 µA sampling current, especially in high-impedance supply paths - preventing false resets and ensuring accurate threshold detection per Section 9.2.2.1.
TPS3839L30DBZT 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:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 120ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TPS3839L30DBZT FAQ
1.How can I place an order for TPS3839L30DBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3839L30DBZT 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 TPS3839L30DBZT reliable?
The price and inventory of TPS3839L30DBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3839L30DBZT is usually 5 days.
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Once your TPS3839L30DBZT 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 TPS3839L30DBZT?
For technical support, including TPS3839L30DBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3839L30DBZT requirements.
6.How does Aetrix verify that TPS3839L30DBZT is sourced from the original manufacturer or authorized distributors?
All TPS3839L30DBZT 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 TPS3839L30DBZT meets industry standards.
7.What is the process for return or replacement of TPS3839L30DBZT?
All TPS3839L30DBZT units undergo pre-shipment inspection (PSI). If there is an issue with TPS3839L30DBZT, 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 TPS3839L30DBZT part is unused and in its original packaging.
Return procedure for TPS3839L30DBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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