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Texas Instruments TPS3126E12DBVR
- Part No.:
- TPS3126E12DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3126E12DBVR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,085
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Product details
Overview
TPS3126E12DBVR from Texas Instruments is a 1.2V ultra-low-voltage supervisor IC with active-high push-pull RESET output, manual reset (MR) input, and no watchdog timer. It monitors supply rails down to 0.9V, asserts RESET when VDD falls below 1.10–1.18V, provides 180ms fixed reset delay, draws 14μA typical supply current, and operates across –40°C to +85°C for embedded processor power sequencing in battery-powered systems.
For engineers reviewing the TPS3126E12DBVR datasheet, TPS3126E12DBVR pinout, TPS3126E12DBVR application, or TPS3126E12DBVR equivalent, key selection criteria include its E12 threshold variant (1.14V nominal), MR-enabled reset control, absence of WDI, active-high output topology, and SOT-23-5 package compatibility with space-constrained DSP and microcontroller designs.
Technical Context
The TPS3126E12DBVR implements a fixed-threshold voltage monitor with internal hysteresis (20mV for 1.14V VIT−) and a precise 180ms power-on reset delay. Its active-high RESET output remains asserted until VDD rises above VIT+ = VIT− + VHYS, then holds for td before deasserting - ensuring reliable processor initialization.
This device belongs to the TPS312x family variant with manual reset (MR) support and push-pull output, distinguishing it from TPS3123/3124/3128 (watchdog-enabled) and TPS3124/3125 (no MR). It lacks WDI functionality and uses a dedicated MR pin to force RESET independently of VDD monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.10–1.18 V (E12 variant); ensures reliable detection of 1.2V rail collapse with ±40mV tolerance over temperature |
| Reset Delay | 100–260 ms (nominal 180 ms); guarantees sufficient hold time for full processor boot sequence |
| Supply Voltage Range | 0.9–3.3 V; supports operation during brown-out and ultra-low-power states |
| Supply Current | 14 μA typical at 0.9V; enables multi-year battery life in always-on portable equipment |
| Operating Temperature | –40°C to +85°C; validated for industrial and automotive cabin environments |
| Output Type | Active-high push-pull; drives logic-high RESET directly without external pull-up, reducing BOM count |
| Hysteresis | 20 mV (at 1.14V threshold); prevents oscillation during slow-rising/falling supply transitions |
Pinout & Package
SOT-23-5 package (2.90 mm × 1.60 mm body, 0.95 mm height), surface-mount, RoHS-compliant, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-high push-pull output | Drives high during fault; asserts system reset without external components; compatible with CMOS input thresholds |
| 2 - GND | Ground reference | Return path for internal circuitry and RESET output; must be connected to low-impedance system ground plane |
| 3 - MR | Manual reset input | Logic-low assertion forces immediate RESET activation regardless of VDD level or timing state |
| 4 - NC | No connect | Internally unconnected; must remain floating or tied to GND per design guidelines |
| 5 - VDD | Supply input | Power source for internal comparator and timer; requires local 0.1 µF ceramic decoupling capacitor |
Key Features
| Feature | Design Value |
|---|---|
| 1.2V rail supervision | Fixed E12 threshold (1.14V nominal) eliminates need for external resistor divider, saving PCB area and calibration effort |
| Manual reset input (MR) | Enables hardware-triggered system recovery from software lockup or user-initiated reboot without power cycle |
| 180ms fixed reset delay | Guarantees stable power delivery before processor release, eliminating need for external RC timing network |
| Ultra-low 14μA supply current | Minimizes quiescent drain on coin-cell or Li-ion batteries in sleep-mode applications |
| Push-pull active-high output | Directly interfaces with MCU reset pins requiring high-active assertion, avoiding pull-up resistors and signal inversion |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Wearable glucose monitors powered by CR2032 coin cells operating intermittently for 3+ years. IC Role / Device Role / Timing Role: Monitors 1.2V LDO output to detect battery depletion and trigger controlled shutdown before data corruption. Use Value: 14μA supply current extends battery life; 1.14V threshold aligns precisely with 1.2V rail collapse point; MR allows on-demand recalibration reset. | Use Scenario: DIN-rail mounted programmable logic controller modules with isolated 1.2V digital supply rails. IC Role / Device Role / Timing Role: Provides fail-safe power-on reset and field-serviceable manual reset for firmware updates. Use Value: Push-pull active-high output drives reset inputs of ARM Cortex-M7 MCUs directly; 180ms delay meets IEC 61131-2 cold-start timing requirements. |
| Wireless Edge Node Gateways | Automotive Infotainment Subsystems |
Use Scenario: LoRaWAN gateways using 1.2V core supplies for RF SoCs in remote infrastructure deployments. IC Role / Device Role / Timing Role: Supervises primary 1.2V domain and coordinates reset sequencing with PMIC-controlled auxiliary rails. Use Value: Fixed 1.14V threshold avoids false triggers during RF transmit bursts; MR pin integrates with watchdog MCU GPIO for autonomous recovery. | Use Scenario: Head unit display controllers receiving 1.2V from vehicle body-control module DC-DC converters. IC Role / Device Role / Timing Role: Ensures deterministic reset after ignition-on voltage ramp and handles load-dump-induced dips. Use Value: 20mV hysteresis prevents chatter during slow 12V-to-1.2V conversion; –40°C to +85°C rating covers under-hood thermal extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3125E12DBVR | Active-high open-drain RESET output; no internal pull-up; requires external pull-up resistor | Suitable where bus-shared reset lines or level translation is needed; incompatible with direct MCU reset pin drive | Select only if system requires wired-OR reset architecture or voltage-level shifting |
| TPS3123E12DBVR | Includes watchdog timer (WDI) and active-low push-pull RESET; no active-high output | Used in systems requiring software hang detection; incompatible with active-high reset MCU inputs without inversion | Choose when watchdog supervision is mandatory and reset polarity can be adapted via inverter or MCU configuration |
Compared with TPS3125E12DBVR, TPS3126E12DBVR eliminates external pull-up components and simplifies layout; compared with TPS3123E12DBVR, it removes watchdog complexity while providing native active-high assertion - making it optimal for deterministic, low-component-count reset control in 1.2V processor domains.
Availability
TPS3126E12DBVR is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, wireless edge node gateways, and automotive infotainment subsystems requiring stable component supply across extended product lifecycles.
Supply support for TPS3126E12DBVR 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 for industrial, automotive, and personal electronics markets.
The TPS312x product line delivers ultra-low-voltage, feature-selectable supervisors for DSP and microcontroller-based systems requiring precise power-rail monitoring and deterministic reset timing in space- and power-constrained designs.
FAQ
What is the exact reset threshold voltage range for TPS3126E12DBVR?
The TPS3126E12DBVR has a guaranteed negative-going input threshold voltage (VIT−) range of 1.10 V to 1.18 V at TA = –40°C to +85°C, with a nominal value of 1.14 V. This E12 variant is specifically calibrated for 1.2V supply rails and includes 20 mV of built-in hysteresis to prevent false triggering during supply transients.
Does TPS3126E12DBVR include a watchdog timer function?
No, TPS3126E12DBVR does not include a watchdog timer. It belongs to the MR-enabled, active-high output subset of the TPS312x family (alongside TPS3125) and omits the WDI pin and associated timing circuitry. Watchdog functionality is present only in TPS3123, TPS3124, and TPS3128 variants.
What is the function of Pin 4 (NC) on TPS3126E12DBVR?
Pin 4 on TPS3126E12DBVR is designated NC (No Connect) and is internally unconnected. It must be left floating or tied to GND per TI's recommended layout practices; routing signals or applying voltage to this pin may cause unpredictable behavior or damage.
How does the manual reset (MR) input behave on TPS3126E12DBVR?
The MR input on TPS3126E12DBVR is an active-low asynchronous control: pulling MR to logic low immediately asserts the active-high RESET output, independent of VDD level or threshold crossing. After MR returns high, RESET deasserts only after the full 180ms delay expires - ensuring clean, timed release.
Is TPS3126E12DBVR compatible with 0.9V supply operation?
Yes, TPS3126E12DBVR is fully specified to operate with supply voltages as low as 0.9V. Its internal circuitry remains functional and RESET output is valid down to this minimum VDD, enabling use in deep-sleep or energy-harvesting systems where supply rails dip near cutoff.
TPS3126E12DBVR 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:
- 1.14V
- 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
TPS3126E12DBVR FAQ
1.How can I place an order for TPS3126E12DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3126E12DBVR 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 TPS3126E12DBVR reliable?
The price and inventory of TPS3126E12DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3126E12DBVR is usually 5 days.
3.What payment methods are accepted for TPS3126E12DBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3126E12DBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS3126E12DBVR?
TPS3126E12DBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3126E12DBVR 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 TPS3126E12DBVR?
For technical support, including TPS3126E12DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3126E12DBVR requirements.
6.How does Aetrix verify that TPS3126E12DBVR is sourced from the original manufacturer or authorized distributors?
All TPS3126E12DBVR 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 TPS3126E12DBVR meets industry standards.
7.What is the process for return or replacement of TPS3126E12DBVR?
All TPS3126E12DBVR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3126E12DBVR, 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 TPS3126E12DBVR part is unused and in its original packaging.
Return procedure for TPS3126E12DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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