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Texas Instruments TPS3828-33DBVRG4
- Part No.:
- TPS3828-33DBVRG4
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3828-33DBVRG4.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
TPS3828-33DBVRG4 from Texas Instruments is a 3.3V supply voltage supervisor IC with open-drain active-low reset output, integrated watchdog timer (1.6s timeout), 200ms reset delay, and manual reset input - designed for reliable power-on initialization and fault recovery in microcontroller-based systems operating from −40°C to 85°C.
For engineers reviewing the TPS3828-33DBVRG4 datasheet, TPS3828-33DBVRG4 pinout, TPS3828-33DBVRG4 application, or TPS3828-33DBVRG4 equivalent, this page delivers verified electrical specs, SOT-23-5 pin mapping, real-world use cases in embedded control and portable electronics, and validated alternative parts with documented functional differences.
Technical Context
The TPS3828-33DBVRG4 implements fixed-threshold supervision (VIT− = 2.93 V, ±70 mV) with hysteresis (50 mV), triggering reset when VDD falls below threshold or watchdog timeout occurs due to missing WDI edge transitions. Its internal oscillator drives a 1.6s watchdog timer, and reset assertion persists for 200ms after VDD recovers above (VIT− + VHYS).
It features an open-drain RESET output requiring external pull-up, manual reset (MR) input with 90 kΩ internal pull-up, and operates across 1.1 V to 5.5 V supply range while drawing only 15 µA typical quiescent current - enabling integration into low-power battery-operated systems without burdening the supply rail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.1 V to 5.5 V - supports operation during brown-out and startup before main regulator stabilizes |
| Reset Threshold (VIT−) | 2.86 V to 3.00 V at −40°C to 85°C - precisely matches 3.3 V rail with 3% tolerance for robust undervoltage detection |
| Watchdog Timeout | 0.9 s to 2.5 s (typ. 1.6 s) - provides fail-safe recovery window for firmware hangs in DSP/microcontroller applications |
| Reset Delay Time (td) | 120 ms to 300 ms (typ. 200 ms) - ensures stable power and clock settling before releasing processor from reset |
| Quiescent Current (IDD) | 15 µA (typ.), 25 µA (max) - enables multi-year battery life in always-on monitoring circuits |
| Output Type | Open-drain RESET - allows wired-OR configuration with other supervisors or level translation to different logic families |
| Operating Temperature | −40°C to +85°C - qualified for industrial and commercial embedded environments without derating |
Pinout & Package
TPS3828-33DBVRG4 is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for space-constrained PCB layouts and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low open-drain reset output | Drives low to assert system reset; requires external pull-up resistor to define logic-high voltage and sink current capability |
| 2 - GND | Ground reference | Primary return path for internal circuitry and reset output sink current; must be low-impedance connection to system ground plane |
| 3 - MR | Manual reset input | Pull low to force immediate reset; internally pulled up to VDD via 90 kΩ resistor - floating or tied to VDD disables manual reset |
| 4 - WDI | Watchdog timer input | Falling edge resets watchdog timer; no transition >1.6 s triggers reset; floating state generates internal pulses to prevent spurious timeout |
| 5 - VDD | Supply and monitored voltage input | Powers device and serves as supervised rail; asserts reset if drops below 2.86–3.00 V; bypass capacitor (0.1 µF ceramic) required near pin |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3 V threshold supervision | Eliminates external resistor divider; guarantees ±70 mV accuracy over temperature without calibration |
| 1.6 s watchdog timeout | Provides deterministic recovery window for firmware stalls in microcontrollers without software overhead |
| 200 ms reset delay | Ensures stable clock and power domains before CPU release - prevents race conditions during boot |
| Open-drain RESET output | Enables shared reset bus across multiple ICs and flexible voltage-level interfacing (e.g., 3.3 V MCU with 5 V peripheral) |
| Manual reset (MR) with internal pull-up | Reduces BOM count by eliminating external pull-up; simplifies push-button reset implementation |
| 15 µA supply current | Minimizes standby power draw - critical for battery-backed systems and energy-harvesting applications |
Applications
| Industrial Programmable Logic Controller (PLC) | Portable Medical Monitor |
|---|---|
|
Use Scenario: Monitors 3.3 V I/O supply in DIN-rail mounted PLC modules subject to voltage transients and EMI. IC Role / Device Role / Timing Role: Supervises VDD, asserts open-drain RESET to halt FPGA configuration and microcontroller execution on undervoltage, and triggers watchdog reset if firmware locks during field updates. Use Value: Prevents corrupted logic states and unsafe actuator outputs by enforcing clean power-up sequencing and hard-fault recovery within 200 ms. |
Use Scenario: Powers on and supervises the main 3.3 V rail of a handheld ECG monitor with Bluetooth LE connectivity and rechargeable Li-ion battery. IC Role / Device Role / Timing Role: Generates power-on reset after battery voltage exceeds 2.86 V, monitors for brown-out during RF transmission bursts, and detects MCU hang via WDI timeout. Use Value: Extends battery runtime via 15 µA quiescent current while guaranteeing patient safety through deterministic reset behavior under low-voltage and firmware fault conditions. |
| Wireless Base Station Remote Radio Unit (RRU) | Notebook Embedded Controller (EC) |
|
Use Scenario: Embedded in outdoor RRU units where temperature swings and power interruptions risk FPGA configuration corruption. IC Role / Device Role / Timing Role: Supervises 3.3 V auxiliary supply, uses MR pin for remote firmware update coordination, and leverages open-drain RESET to interface with 1.8 V FPGA reset input via pull-up to 1.8 V. Use Value: Enables safe field upgrades and eliminates need for external level shifters or pull-up resistors - reducing component count and board area. |
Use Scenario: Integrated into notebook motherboard EC subsystem to manage keyboard, touchpad, and thermal sensors powered from 3.3 V rail. IC Role / Device Role / Timing Role: Provides synchronized reset to EC and companion PMIC during AC adapter plug-in/out events, with WDI fed by EC's heartbeat timer to detect firmware lockups. Use Value: Eliminates EC-related boot failures and spontaneous reboots by catching hung firmware before it disrupts USB or SMBus communication with host CPU. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3823-33DBVR | Push-pull RESET output (not open-drain); identical 3.3 V threshold, 1.6 s watchdog, 200 ms delay | Requires dedicated reset net; cannot share reset bus or interface directly to lower-voltage logic without level shifter | Select when system needs driven high/low reset signal and no wired-OR or mixed-voltage reset sharing is required |
| MAX6326UT33+T | 3.3 V supervisor with 200 ms delay, no watchdog timer, push-pull output, −40°C to 85°C rating | Lacks WDI functionality; suited for simpler power-monitoring-only use cases without firmware supervision | Select when watchdog capability is unnecessary and cost-sensitive designs prioritize single-function reliability over feature richness |
Compared with TPS3828-33DBVRG4, TPS3823-33DBVR offers stronger drive but forfeits reset bus flexibility, while MAX6326UT33+T reduces complexity and cost by omitting watchdog - making each alternative optimal only when those specific trade-offs align with system architecture requirements.
Availability
TPS3828-33DBVRG4 is available at Aetrix Electronics and suitable for industrial automation, portable medical devices, wireless infrastructure, and notebook computing applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for TPS3828-33DBVRG4 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 power management, signal chain, and microcontroller technologies.
The TPS382x family was engineered specifically for robust power-supply monitoring and system-level fault recovery in processor-centric applications - emphasizing low quiescent current, precise threshold accuracy, and integrated watchdog functionality in minimal footprint packages.
FAQ
What is the exact reset threshold voltage of the TPS3828-33DBVRG4?
The TPS3828-33DBVRG4 has a negative-going input threshold voltage (VIT−) of 2.86 V (min), 2.93 V (typ), and 3.00 V (max) across −40°C to 85°C. This 3.3 V nominal threshold includes 50 mV hysteresis to prevent chatter during slow-rising or noisy supply rails - confirmed in Section 6.5 of the SLVS165O datasheet.
Does the TPS3828-33DBVRG4 require an external pull-up resistor on the RESET pin?
Yes, the TPS3828-33DBVRG4 features an open-drain RESET output and requires an external pull-up resistor to establish the logic-high voltage level. The value depends on sink current and rise time requirements; typical values range from 10 kΩ to 100 kΩ pulled to the target logic rail - as specified in the Functional Block Diagram and Pin Functions table of the datasheet.
How does the watchdog timer in the TPS3828-33DBVRG4 operate?
The TPS3828-33DBVRG4 watchdog timer times out after 0.9 s to 2.5 s (typ. 1.6 s) if no falling edge is detected on the WDI pin. A falling edge resets the timer; if WDI floats, internal pulses prevent timeout. When timeout occurs, RESET asserts low for 120–300 ms (typ. 200 ms) - fully detailed in Sections 7.3.4 and 6.8 of the SLVS165O datasheet.
Can the TPS3828-33DBVRG4 be used in automotive applications?
No - the TPS3828-33DBVRG4 is characterized for −40°C to +85°C operation and is not AEC-Q100 qualified. For automotive use, TI recommends the TPS3823A-33 variant (rated −40°C to +125°C) or purpose-built automotive supervisors like the TLV809 series, which meet extended temperature and qualification requirements.
What is the supply current consumption of the TPS3828-33DBVRG4?
The TPS3828-33DBVRG4 draws 15 µA typical and 25 µA maximum quiescent current (IDD) when MR, WDI, and outputs are unconnected - measured across −40°C to 85°C per Section 6.5 of the SLVS165O datasheet. This ultra-low current enables deployment in always-on battery-powered systems without significant runtime impact.
TPS3828-33DBVRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 120ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TPS3828-33DBVRG4 FAQ
1.How can I place an order for TPS3828-33DBVRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3828-33DBVRG4 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 TPS3828-33DBVRG4 reliable?
The price and inventory of TPS3828-33DBVRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3828-33DBVRG4 is usually 5 days.
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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 TPS3828-33DBVRG4?
For technical support, including TPS3828-33DBVRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3828-33DBVRG4 requirements.
6.How does Aetrix verify that TPS3828-33DBVRG4 is sourced from the original manufacturer or authorized distributors?
All TPS3828-33DBVRG4 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 TPS3828-33DBVRG4 meets industry standards.
7.What is the process for return or replacement of TPS3828-33DBVRG4?
All TPS3828-33DBVRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3828-33DBVRG4, 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 TPS3828-33DBVRG4 part is unused and in its original packaging.
Return procedure for TPS3828-33DBVRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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