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Texas Instruments TPS3126E18DBVT
- Part No.:
- TPS3126E18DBVT
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3126E18DBVT.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,178
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Product details
Overview
TPS3126E18DBVT from Texas Instruments is an ultra-low-voltage supervisor IC with 1.71 V nominal reset threshold, 180 ms fixed power-on reset delay, manual reset (MR) input, and open-drain active-low RESET output-designed for reliable system initialization in 1.8 V rail monitoring applications such as industrial microcontroller systems.
For engineers reviewing the TPS3126E18DBVT datasheet, TPS3126E18DBVT pinout, TPS3126E18DBVT application, or TPS3126E18DBVT equivalent, this page delivers verified specifications, validated pin functions, confirmed thermal and timing behavior, and real-world use context for low-power embedded reset supervision.
Technical Context
The TPS3126E18DBVT integrates voltage monitoring, manual reset assertion, and built-in hysteresis (20 mV at 1.71 V threshold) to prevent false triggering during supply ramp-up or noise events. Its internal reference and comparator architecture ensures stable VIT− detection down to 0.9 V supply operation.
This device operates exclusively in open-drain active-low RESET mode and supports manual reset via MR pin-asserting RESET low on MR low, independent of VDD status. It lacks watchdog timer functionality, distinguishing it from TPS3123/3124/3128 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 1.65–1.77 V (nominal 1.71 V); precisely monitors 1.8 V rails with ±3% tolerance over temperature. |
| Reset Delay Time | 100–260 ms (nominal 180 ms); guarantees sufficient processor hold time after power stabilization. |
| Supply Voltage Range | 0.9–3.3 V; enables operation across ultra-low-voltage logic domains including sub-1 V startup sequences. |
| Quiescent Current | 14 µA at 0.9 V; minimizes battery drain in always-on portable and remote sensor nodes. |
| Operating Temperature | –40°C to +85°C; qualified for industrial-grade reliability in factory automation and building control environments. |
| Output Type | Open-drain active-low RESET; allows wired-OR configuration and flexible pull-up voltage selection (e.g., 3.3 V or 5 V). |
| Hysteresis | 20 mV at 1.71 V threshold; prevents oscillation during slow-rising or noisy supply transitions. |
Pinout & Package
TPS3126E18DBVT is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for space-constrained PCB layouts in portable and industrial electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Open-drain active-low output | Drives low when VDD < VIT− or MR is asserted; requires external pull-up for logic-level compatibility. |
| 2: GND | Ground reference | Primary return path for internal circuitry; must be connected to system ground plane with low-impedance trace. |
| 3: MR | Manual reset input | Active-low trigger: pulling low forces RESET assertion regardless of VDD level or threshold crossing. |
| 4: NC | No connect | Internally unconnected pin; must remain floating-no external connection permitted. |
| 5: VDD | Supply input | Accepts 0.9–3.3 V; requires 0.1 µF ceramic decoupling capacitor placed adjacent to pin per analog best practice. |
Key Features
| Feature | Design Value |
|---|---|
| 1.71 V precision threshold | Factory-trimmed for 1.8 V rail monitoring-eliminates need for external resistor divider or calibration. |
| 180 ms fixed reset delay | Guarantees deterministic system reset timing without external RC components or firmware dependency. |
| Manual reset (MR) input | Enables hardware-initiated reset for recovery from software lockup or user-triggered reinitialization. |
| Open-drain RESET output | Supports multi-source reset arbitration and mixed-voltage system interfacing via configurable pull-up. |
| Ultra-low 14 µA supply current | Extends battery life in energy-sensitive applications such as wireless sensors and handheld diagnostics. |
Applications
| Industrial Microcontroller Systems | Portable Diagnostic Equipment |
|---|---|
|
Use Scenario: Supervises 1.8 V core supply of ARM Cortex-M4-based PLC controllers during cold start and brownout conditions. IC Role / Device Role / Timing Role: Voltage monitor and reset generator ensuring deterministic boot sequence before firmware execution begins. Use Value: Prevents corrupted register states and undefined peripheral behavior by enforcing minimum 180 ms reset hold time post-power stabilization. |
Use Scenario: Monitors battery-backed 1.8 V logic rail in handheld ECG analyzers operating on coin-cell power. IC Role / Device Role / Timing Role: Low-current supervisor enabling >5-year shelf life while guaranteeing safe MCU restart after voltage sag. Use Value: 14 µA quiescent current directly extends operational runtime; 1.71 V threshold aligns with Li-ion discharge curve end-of-life voltage. |
| Building Automation Sensors | Factory Floor Edge Nodes |
|
Use Scenario: Provides fail-safe reset for Zigbee-enabled temperature/humidity nodes deployed in HVAC ducts. IC Role / Device Role / Timing Role: Standalone reset supervisor interfaced to MSP430FR59xx MCU with MR tied to local fault button. Use Value: MR pin enables field technician-initiated recovery without power cycle; –40°C to +85°C rating ensures reliability in unconditioned environments. |
Use Scenario: Ensures robust boot integrity for STM32H7-based predictive maintenance gateways exposed to electrical noise near motors. IC Role / Device Role / Timing Role: Open-drain RESET output wired-OR'd with multiple subsystem supervisors into single reset tree. Use Value: 20 mV hysteresis rejects transient noise on 1.8 V rail; SOT-23 footprint simplifies layout in dense industrial PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3125E18DBVR | Same 1.71 V threshold and 180 ms delay, but push-pull active-low RESET output instead of open-drain. | Requires dedicated reset net; cannot share pull-up with other supervisors or interface to higher-voltage logic. | Select when board layout prohibits external pull-up or when driving capacitive loads exceeding 50 pF. |
| TPS3808G18DBVR | Adjustable delay (0.5–10 s), 1.71 V threshold, push-pull active-low RESET, 2.5 µA typical IQ. | Higher integration (enable input, adjustable timeout), lower current-but larger SOT-23-6 package and no MR pin. | Select when extended delay flexibility or ultra-low standby current outweighs need for manual reset or open-drain topology. |
Compared with TPS3126E18DBVT, TPS3125E18DBVR offers simpler drive capability but less system-level flexibility, while TPS3808G18DBVR trades MR and open-drain advantages for programmability and lower IQ-making TPS3126E18DBVT optimal for cost-sensitive, noise-immune, multi-supervisor reset trees.
Availability
TPS3126E18DBVT is available at Aetrix Electronics and suitable for industrial microcontroller systems, portable diagnostic equipment, building automation sensors, and factory floor edge nodes requiring stable component supply across extended product lifecycles.
Supply support for TPS3126E18DBVT 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 leader specializing in analog and embedded processing technologies, with decades of expertise in power management and system supervision ICs.
The TPS312x family was engineered specifically for ultra-low-voltage, high-reliability reset supervision in DSP and microcontroller-based systems-emphasizing minimal external components, wide supply range, and industrial temperature operation.
FAQ
What is the exact reset threshold voltage of the TPS3126E18DBVT?
The TPS3126E18DBVT has a guaranteed negative-going input threshold voltage (VIT−) of 1.65 V (min), 1.71 V (nom), and 1.77 V (max) across –40°C to +85°C, calibrated for 1.8 V rail supervision with ±3% accuracy and 20 mV hysteresis.
Does the TPS3126E18DBVT include a watchdog timer function?
No, the TPS3126E18DBVT does not include a watchdog timer. It is a dedicated voltage supervisor with manual reset (MR) input and open-drain active-low RESET output-unlike TPS3123/3124/3128 variants which integrate watchdog functionality.
What is the function of Pin 4 (NC) on the TPS3126E18DBVT?
Pin 4 on the TPS3126E18DBVT is a no-connect (NC) terminal-internally unconnected and electrically isolated. It must remain unconnected on the PCB; soldering or routing to this pin may cause functional or reliability issues.
Can the TPS3126E18DBVT operate below 1.0 V supply voltage?
Yes, the TPS3126E18DBVT is fully specified down to 0.9 V supply voltage (VDD), with 14 µA typical supply current at that level-enabling use in ultra-low-power startup sequences and battery-depleted scenarios where other supervisors fail to assert reset.
Is the RESET output of the TPS3126E18DBVT compatible with 3.3 V logic systems?
Yes, the open-drain RESET output of the TPS3126E18DBVT is compatible with 3.3 V logic when paired with a 3.3 V pull-up resistor. The output can safely sink up to 5 mA, and its voltage rating extends to VDD + 0.3 V, supporting mixed-voltage interface designs.
TPS3126E18DBVT 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:
- 1.71V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TPS3126E18DBVT FAQ
1.How can I place an order for TPS3126E18DBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3126E18DBVT 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 TPS3126E18DBVT reliable?
The price and inventory of TPS3126E18DBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3126E18DBVT is usually 5 days.
3.What payment methods are accepted for TPS3126E18DBVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3126E18DBVT transactions.
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4.How is shipping managed for TPS3126E18DBVT?
TPS3126E18DBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3126E18DBVT 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 TPS3126E18DBVT?
For technical support, including TPS3126E18DBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3126E18DBVT requirements.
6.How does Aetrix verify that TPS3126E18DBVT is sourced from the original manufacturer or authorized distributors?
All TPS3126E18DBVT 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 TPS3126E18DBVT meets industry standards.
7.What is the process for return or replacement of TPS3126E18DBVT?
All TPS3126E18DBVT units undergo pre-shipment inspection (PSI). If there is an issue with TPS3126E18DBVT, 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 TPS3126E18DBVT part is unused and in its original packaging.
Return procedure for TPS3126E18DBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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