My Inquiry
My Account
Texas Instruments TPS3125G15DBVRG4
- Part No.:
- TPS3125G15DBVRG4
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3125G15DBVRG4.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,014
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TPS3125G15DBVRG4 from Texas Instruments is a 3.0V-supply-voltage supervisory IC with active-high push-pull RESET output, manual reset (MR) input, and 180ms fixed reset delay. It monitors VDD down to 0.9V minimum supply, asserts RESET when VDD falls below 1.35–1.45V threshold (G15 variant), and operates across –40°C to +85°C for use in battery-powered DSP and microcontroller systems requiring reliable power-on initialization.
For engineers reviewing the TPS3125G15DBVRG4 datasheet, TPS3125G15DBVRG4 pinout, TPS3125G15DBVRG4 application, or TPS3125G15DBVRG4 equivalent, key selection criteria include its 1.40V nominal reset threshold, MR-triggered reset capability, 14μA typical supply current at 0.9V, and SOT-23-5 package compatibility with space-constrained embedded designs.
Technical Context
The TPS3125G15DBVRG4 implements a fixed-threshold voltage supervisor with internal hysteresis (20mV) and a dedicated manual reset input that forces active-high RESET assertion independent of VDD level. Its functional block includes a precision reference divider, transition detector, and reset timer with 180ms delay after VDD rises above VIT+ = VIT− + VHYS.
This device belongs to the TPS312x family configured for 3.0V nominal supply monitoring (L30 variant designation), but the G15 suffix indicates a 1.5V nominal threshold variant - confirmed by electrical characteristics table entry "TPS312xG15" with VIT− = 1.35–1.45V. It lacks watchdog timer functionality, distinguishing it from TPS3123/3124/3128 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 1.35–1.45V (G15 variant); ensures reliable detection of 1.5V rail undervoltage before system instability. |
| Reset Delay Time | 100–260ms (typ. 180ms); guarantees sufficient hold time for processor core and peripherals to complete reset sequence. |
| Supply Current | 14μA at 0.9V; enables ultra-low-power operation in always-on battery-backed subsystems. |
| Operating Temperature | –40°C to +85°C; supports industrial-grade deployment without derating. |
| Output Type | Active-high push-pull RESET; drives high-impedance loads directly without external pull-up resistor. |
| Minimum Supply Voltage | 0.9V; allows supervision during brownout conditions where other supervisors fail. |
| Hysteresis | 20mV (for 1.4V threshold range); prevents oscillatory reset assertion near trip point under noisy supply conditions. |
Pinout & Package
TPS3125G15DBVRG4 is housed in a 5-pin SOT-23 (DBV) package measuring 2.90mm × 1.60mm, optimized for high-density PCB layouts and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull output; driven high when VDD < VIT− or MR is low; remains asserted for td after VDD recovery. |
| 2 | GND | Ground reference for internal circuitry and reset timing; requires low-impedance connection to system ground plane. |
| 3 | MR | Manual reset input; logic-low assertion forces immediate active-high RESET regardless of VDD level or threshold state. |
| 4 | NC | No connect; internally unconnected pin; must be left floating or tied to GND per design guidelines. |
| 5 | VDD | Power supply input; accepts 0.9V–3.3V; requires 0.1µF ceramic bypass capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 1.40V reset threshold | Eliminates need for external resistor divider; reduces BOM count and layout area in 1.5V domain applications. |
| 180ms factory-programmed reset delay | Guarantees consistent reset timing across temperature and voltage; avoids custom RC network calibration. |
| Manual reset (MR) input | Enables system-level reset initiation via FPGA, button, or fault signal - independent of power rail status. |
| 0.9V minimum operating voltage | Permits supervision during deep brownout events where competing devices lose functionality. |
| Push-pull active-high RESET | Drives high-impedance loads directly; removes dependency on external pull-up resistors and associated leakage paths. |
Applications
| Industrial PLC I/O Module | Portable Medical Sensor Node |
|---|---|
Use Scenario: Power sequencing and fault recovery in DIN-rail mounted programmable logic controllers with isolated 1.5V digital logic rails. IC Role / Device Role / Timing Role: Monitors 1.5V FPGA I/O bank supply and asserts active-high RESET to halt configuration until stable; MR pin linked to watchdog MCU for emergency shutdown. Use Value: Prevents partial configuration lockup during transient brownouts; 14μA quiescent current extends backup battery life during maintenance mode. |
Use Scenario: Battery-powered wearable ECG sensor with ultra-low-power ARM Cortex-M0+ MCU and analog front-end. IC Role / Device Role / Timing Role: Supervises 1.5V ADC reference and MCU core supply; triggers hardware reset if VDD drops below 1.35V during lithium coin-cell discharge. Use Value: Ensures deterministic startup after battery insertion; 0.9V minimum operation allows full reset functionality even at end-of-life cell voltage (~0.95V). |
| Smart Building HVAC Controller | Wireless Gateway Baseband Processor |
Use Scenario: Embedded controller managing temperature, humidity, and CO₂ sensors in commercial HVAC units powered by 3.3V SMPS with 1.5V LDO stage. IC Role / Device Role / Timing Role: Resets baseband SoC when 1.5V LDO output sags due to load transients; MR pin connected to smoke detector alarm line for forced system reset. Use Value: Eliminates firmware hang risk during HVAC motor startup surges; push-pull output interfaces directly with SoC's active-high reset pin without level-shifting. |
Use Scenario: Cellular IoT gateway using LTE-M modem with dual-core application processor and 1.5V memory interface. IC Role / Device Role / Timing Role: Provides power-on reset and brownout protection for 1.5V DDR I/O supply; MR pin tied to thermal shutdown signal from PMIC. Use Value: Guarantees clean boot after thermal throttling event; 20mV hysteresis prevents false resets during supply ripple common in RF-intensive environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3124G15DBVR | Active-high open-drain RESET output; no internal pull-up; requires external pull-up resistor. | Suitable where bus-shared reset lines or wired-OR logic required; incompatible with direct drive of active-high reset pins lacking pull-up. | Select TPS3124G15DBVR only if open-drain topology matches system-level reset bus architecture. |
| TPS3808G15DBVR | Adjustable reset delay (via external capacitor); 1.4V threshold; 2.5μA supply current; no MR pin. | Better suited for ultra-low-power applications where delay tuning is needed; lacks manual reset capability for field-service or fault-initiated reset. | Choose TPS3808G15DBVR when delay customization and sub-5μA quiescent current outweigh need for MR functionality. |
Compared with TPS3124G15DBVR and TPS3808G15DBVR, the TPS3125G15DBVRG4 provides push-pull active-high RESET without external components and retains MR input - making it optimal for compact, self-contained reset control in 1.5V-rail systems where board space and reset flexibility are critical.
Availability
TPS3125G15DBVRG4 is available at Aetrix Electronics and suitable for industrial automation, portable medical devices, and smart building controllers requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for TPS3125G15DBVRG4 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 product line delivers ultra-low-voltage, feature-rich supervisory circuits for DSP, MCU, and FPGA-based systems - designed specifically for robust power-on reset, brownout protection, and manual fault recovery in space- and power-constrained applications.
FAQ
What is the exact reset threshold voltage of the TPS3125G15DBVRG4?
The TPS3125G15DBVRG4 has a guaranteed negative-going input threshold voltage (VIT−) of 1.35V minimum, 1.40V typical, and 1.45V maximum at TA = –40°C to +85°C. This 1.5V nominal threshold variant (G15 suffix) is factory-trimmed and does not require external calibration - ensuring consistent 1.5V rail supervision across production lots and temperature ranges.
Does the TPS3125G15DBVRG4 include a watchdog timer function?
No, the TPS3125G15DBVRG4 does not include a watchdog timer. Per the device comparison table and functional mode documentation, only TPS3123, TPS3124, and TPS3128 variants integrate WDI functionality. The TPS3125G15DBVRG4 is a dedicated voltage supervisor with manual reset (MR) input and fixed 180ms delay - optimized for simplicity and reliability in non-watchdog applications.
What is the purpose of Pin 4 (NC) on the TPS3125G15DBVRG4?
Pin 4 on the TPS3125G15DBVRG4 is designated NC (No Connect) and is internally unconnected. It must be left floating or tied to GND per TI's layout guidance; connecting it to VDD or driving it actively may cause undefined behavior. This pin exists for package compatibility across the TPS312x family but serves no electrical function in the TPS3125G15DBVRG4 variant.
Can the TPS3125G15DBVRG4 operate from a 0.9V supply?
Yes, the TPS3125G15DBVRG4 is fully specified to operate down to 0.9V supply voltage (VDD), with 14μA typical supply current at that level. Its RESET output remains valid and functional at 0.9V, enabling supervision during deep brownout conditions where many competing supervisors cease operation - a key differentiator for battery-critical applications.
How does the manual reset (MR) input interact with the voltage supervision function in the TPS3125G15DBVRG4?
In the TPS3125G15DBVRG4, the MR input operates independently of VDD monitoring: a logic-low signal on MR forces immediate active-high RESET assertion regardless of whether VDD is above or below VIT−. Once MR returns high, RESET deasserts after the full 180ms delay period - ensuring deterministic timing even during manual intervention events such as field service or fault escalation.
TPS3125G15DBVRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 1.4V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/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
TPS3125G15DBVRG4 FAQ
1.How can I place an order for TPS3125G15DBVRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3125G15DBVRG4 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 TPS3125G15DBVRG4 reliable?
The price and inventory of TPS3125G15DBVRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3125G15DBVRG4 is usually 5 days.
3.What payment methods are accepted for TPS3125G15DBVRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3125G15DBVRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS3125G15DBVRG4?
TPS3125G15DBVRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3125G15DBVRG4 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 TPS3125G15DBVRG4?
For technical support, including TPS3125G15DBVRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3125G15DBVRG4 requirements.
6.How does Aetrix verify that TPS3125G15DBVRG4 is sourced from the original manufacturer or authorized distributors?
All TPS3125G15DBVRG4 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 TPS3125G15DBVRG4 meets industry standards.
7.What is the process for return or replacement of TPS3125G15DBVRG4?
All TPS3125G15DBVRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3125G15DBVRG4, 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 TPS3125G15DBVRG4 part is unused and in its original packaging.
Return procedure for TPS3125G15DBVRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TPS3125G15DBVRG4 Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
