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Texas Instruments TPS3123J12DBVR
- Part No.:
- TPS3123J12DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3123J12DBVR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,690
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Product details
Overview
TPS3123J12DBVR from Texas Instruments is an ultra-low-voltage processor supervisory IC with 1.08 V nominal reset threshold (VIT–), 180 ms power-on reset delay, manual reset (MR) input, and watchdog timer (WDI) functionality. It monitors supply rails down to 0.9 V, asserts active-low RESET during undervoltage or watchdog timeout, and operates in portable DSP systems requiring reliable system initialization and hang detection.
For engineers reviewing the TPS3123J12DBVR datasheet, TPS3123J12DBVR pinout, TPS3123J12DBVR application, or TPS3123J12DBVR equivalent, this page delivers verified specifications, SOT-23-5 package details, functional mode clarity (MR + WDI + push-pull RESET), and real-world use context for battery-powered and industrial embedded designs.
Technical Context
The TPS3123J12DBVR integrates voltage supervision, a 1.4 s typical watchdog timeout (ttout), and manual reset assertion into a single 5-pin SOT-23 device. Its internal voltage divider sets a fixed 1.08 V threshold with 15 mV hysteresis, eliminating external resistors, and RESET remains invalid below 0.9 V supply.
It uses a transition-triggered watchdog logic that resets on missing rising/falling edges at WDI, and MR forces immediate RESET assertion independent of VDD or watchdog state - both features are confirmed active in the TPS3123 variant per device comparison and pin function tables.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VIT–) | 1.08 V (nominal); precise factory-trimmed for 1.2 V rail monitoring with ±40 mV tolerance over –40°C to +85°C |
| Reset Delay (td) | 180 ms (nominal); fixed internal timer ensures stable processor boot sequence after power-up or MR release |
| Watchdog Timeout (ttout) | 1.4 s (nominal); detects software hangs by requiring periodic WDI edge transitions - no external timing components needed |
| Supply Current (IDD) | 14 µA (typical at 0.9 V); enables multi-year operation in coin-cell–powered IoT sensors and wearables |
| Operating Voltage Range | 0.9 V to 3.3 V; supports direct integration with sub-1.2 V logic rails and legacy 3.3 V systems without level-shifting |
| Output Type | Active-low push-pull RESET; drives low without external pull-up, simplifying PCB layout and reducing BOM count |
| Package | SOT-23-5 (DBV); 2.90 mm × 1.60 mm footprint compatible with high-density portable PCBs and automated assembly |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body size, gull-wing leads, RoHS-compliant NiPdAu/Sn lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low output | Drives logic-low during undervoltage, watchdog timeout, or MR assertion; push-pull structure eliminates need for external pull-up resistor |
| 2 - GND | Ground reference | Primary return path for internal circuitry and RESET output; must be connected to system ground plane for noise immunity |
| 3 - MR | Manual reset input | Asynchronous active-low trigger: pulling to GND forces immediate RESET assertion regardless of VDD or WDI state |
| 4 - WDI | Watchdog input | Edge-sensitive input (rising or falling) that resets watchdog timer; floating or static DC causes timeout and RESET assertion |
| 5 - VDD | Supply input | Power rail input (0.9–3.3 V); requires local 0.1 µF ceramic bypass capacitor per TI layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low VDD minimum (0.9 V) | Enables direct monitoring of modern sub-1.2 V processor cores and RF SoCs without intermediate regulators |
| Integrated watchdog + MR | Reduces system-level reset complexity by combining two critical fault-detection paths in one die - no discrete logic or timers required |
| Fixed 1.08 V threshold with 15 mV hysteresis | Guarantees clean, bounce-free RESET assertion/deassertion on 1.2 V rails without external resistor network calibration |
| 14 µA typical supply current | Extends battery life in always-on edge nodes - e.g., 10-year operation on CR2032 when paired with low-power microcontrollers |
| Push-pull active-low RESET | Eliminates external pull-up resistor, reduces board area, and avoids weak-drive issues common with open-drain alternatives |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Wearable ECG patch continuously sampling biopotentials with BLE transmission. IC Role / Device Role / Timing Role: TPS3123J12DBVR monitors 1.2 V LDO output powering the ADC and BLE SoC, asserting RESET if brownout occurs or firmware hangs during data upload. Use Value: Prevents corrupted sensor data transmission and ensures deterministic recovery from lockup - critical for FDA Class II device reliability requirements. |
Use Scenario: DIN-rail mounted PLC module controlling solenoid valves in hazardous-area process control. IC Role / Device Role / Timing Role: TPS3123J12DBVR supervises 1.2 V FPGA configuration rail and triggers watchdog reset if communication stack freezes due to EMI-induced bit flips. Use Value: Avoids unsafe valve states by enforcing hard reset within 1.4 s - meets SIL-2 functional safety response time constraints. |
| Wireless Baseband Processors | Smart Building HVAC Controllers |
|
Use Scenario: LTE Cat-M1 modem in remote asset tracker powered by Li-SOCl₂ primary cell. IC Role / Device Role / Timing Role: TPS3123J12DBVR watches 1.2 V core rail and uses MR to synchronize reset with cellular network registration failure signals. Use Value: Enables coordinated full-system restart upon network loss - eliminates "zombie modem" states consuming standby current. |
Use Scenario: BACnet/IP controller managing chilled water pumps and VAV boxes across commercial buildings. IC Role / Device Role / Timing Role: TPS3123J12DBVR supervises 1.2 V microcontroller supply and feeds WDI with heartbeat pulses from RTOS task scheduler. Use Value: Guarantees fail-safe shutdown of HVAC actuators during firmware crashes - prevents thermal runaway or overcooling incidents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervision and watchdog applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3124J12DBVR | Active-high RESET output only; no watchdog timer; same 1.08 V threshold and MR pin | Used where system logic requires high-valid reset signaling (e.g., enable/disable sequencing), not hang detection | Select when watchdog functionality is unnecessary and active-high assertion aligns with downstream logic polarity |
| TPS3823-12DBVR | Same 1.2 V threshold and 200 ms delay, but no MR or WDI; open-drain RESET output | Targeted at simpler power-monitoring-only use cases where external pull-up is acceptable and fault coverage is limited to VDD | Choose for cost-sensitive, non-critical applications lacking software hang risk - lower gate count and BOM cost |
Compared with TPS3123J12DBVR, TPS3124J12DBVR removes watchdog capability but adds active-high output flexibility, while TPS3823-12DBVR sacrifices both MR and WDI for minimal footprint and cost - making TPS3123J12DBVR the only option combining all three functions in SOT-23-5.
Availability
TPS3123J12DBVR is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, wireless baseband processors, and smart building HVAC controllers requiring stable component supply across long production lifecycles.
Supply support for TPS3123J12DBVR 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, embedded processing, and power management technologies, with decades of expertise in high-reliability supervisory circuits.
The TPS312x family was designed specifically for DSP and processor-based systems needing integrated voltage monitoring, watchdog supervision, and manual reset - targeting battery-constrained and safety-critical embedded applications.
FAQ
What is the exact reset threshold voltage of the TPS3123J12DBVR?
The TPS3123J12DBVR has a nominal negative-going input threshold voltage (VIT–) of 1.08 V, with a guaranteed range of 1.04 V to 1.12 V over –40°C to +85°C. This value is factory-trimmed and applies specifically to the "J12" suffix variant, as confirmed in Section 6.5 Electrical Characteristics of the SLVS227H datasheet.
Does the TPS3123J12DBVR require external components for basic operation?
No, the TPS3123J12DBVR requires no external resistors to set its 1.08 V threshold - it uses an internal precision voltage divider. Only a 0.1 µF ceramic bypass capacitor on VDD is mandatory per TI layout guidance. MR and WDI may be left unconnected if unused, though WDI must not float in watchdog-enabled systems.
How does the watchdog timer in the TPS3123J12DBVR function?
The TPS3123J12DBVR watchdog timer triggers RESET if no rising or falling edge occurs on the WDI pin within 1.4 s (typical). Each valid edge resets the timeout counter. If the host processor fails to toggle WDI - e.g., due to infinite loop or stack overflow - RESET activates for 180 ms, forcing system recovery.
Can the TPS3123J12DBVR operate below 1.2 V supply?
Yes, the TPS3123J12DBVR is fully specified down to 0.9 V supply voltage (VDD), with functional RESET assertion and valid timing. Its 1.08 V threshold ensures reliable supervision of 1.2 V rails even under light load droop, and its 14 µA supply current at 0.9 V supports ultra-low-power designs.
What is the package type and lead finish of the TPS3123J12DBVR?
The TPS3123J12DBVR uses a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm. Its lead finish is NiPdAu over Sn (NIPDAU | SN), RoHS-compliant, with Moisture Sensitivity Level (MSL) 1 and peak reflow rating of 260°C - suitable for standard Pb-free assembly processes.
TPS3123J12DBVR 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:
- 1.08V
- Output:
- Push-Pull, Totem Pole
- 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
TPS3123J12DBVR FAQ
1.How can I place an order for TPS3123J12DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3123J12DBVR 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 TPS3123J12DBVR reliable?
The price and inventory of TPS3123J12DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3123J12DBVR is usually 5 days.
3.What payment methods are accepted for TPS3123J12DBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3123J12DBVR transactions.
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4.How is shipping managed for TPS3123J12DBVR?
TPS3123J12DBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3123J12DBVR 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 TPS3123J12DBVR?
For technical support, including TPS3123J12DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3123J12DBVR requirements.
6.How does Aetrix verify that TPS3123J12DBVR is sourced from the original manufacturer or authorized distributors?
All TPS3123J12DBVR 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 TPS3123J12DBVR meets industry standards.
7.What is the process for return or replacement of TPS3123J12DBVR?
All TPS3123J12DBVR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3123J12DBVR, 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 TPS3123J12DBVR part is unused and in its original packaging.
Return procedure for TPS3123J12DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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