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Texas Instruments TPS3808EG125DBVR
- Part No.:
- TPS3808EG125DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
TPS3808EG125DBVR.pdf
- Description:
- 600NA ULTRA-LOW QUIESCENT CURREN
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
TPS3808EG125DBVR from Texas Instruments is a low-quiescent-current, fixed-threshold supervisory circuit designed to monitor 1.25V power rails in embedded systems. It features ±0.5% threshold accuracy (1.16V nominal trip point), 0.6μA typical supply current, and user-programmable reset delay from 1.25ms to 10s via external capacitor on CT pin. It operates across –40°C to +125°C and asserts an open-drain RESET signal upon undervoltage or manual reset assertion.
For engineers reviewing the TPS3808EG125DBVR datasheet, TPS3808EG125DBVR pinout, TPS3808EG125DBVR application, or TPS3808EG125DBVR equivalent, key selection considerations include its 1.25V fixed monitoring threshold, SOT-23-6 package compatibility with space-constrained PCB layouts, ultra-low IDD for battery-backed systems, and MR/SENSE dual-reset initiation capability.
Technical Context
The TPS3808EG125DBVR implements a precision bandgap reference and comparator architecture to achieve ±0.5% VIT accuracy over temperature. Its internal 220nA CT charging current source enables precise timing control of the reset delay period, with hysteresis (1–2.5%) preventing chatter during threshold crossings.
It supports three reset delay configurations: open CT (20ms), CT-to-VDD via resistor (300ms), or CT-to-GND via capacitor (1.25ms–10s). The MR input includes a 90kΩ internal pull-up, allowing direct GPIO interfacing without external biasing, while the open-drain RESET output requires an external pull-up (10kΩ–1MΩ) and tolerates voltages up to 6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Threshold Voltage (VIT) | 1.16V ±0.5% - precisely monitors 1.25V rail with minimal tolerance drift across temperature. |
| Quiescent Current (IDD) | 0.6μA typical at 3.3V - enables multi-year operation in coin-cell or energy-harvesting systems. |
| Reset Delay Range | 1.25ms to 10s - programmable via external capacitor on CT pin, supporting diverse MCU boot timing requirements. |
| Operating Temperature | –40°C to +125°C - fully specified for under-hood automotive, industrial motor drives, and medical equipment. |
| Supply Voltage Range | 1.7V to 6V - powers from single Li-ion, 3.3V logic rails, or 5V systems without external regulation. |
| SENSE Input Bias Current | ≤1.25μA at 6V - minimizes loading on monitored voltage rails and preserves accuracy of high-impedance dividers. |
| RESET Output Type | Open-drain - allows level-shifting above VDD (up to 6V) and wired-OR reset bus configurations. |
Pinout & Package
TPS3808EG125DBVR is housed in a compact 6-pin SOT-23 (DBV) package measuring 2.90mm × 1.60mm, optimized for high-density PCB layouts in space-constrained applications such as server modules and surgical electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Open-drain output | Asserts low during undervoltage or MR event; requires external pull-up (10kΩ–1MΩ); supports voltage levels up to 6V. |
| 2: GND | Ground reference | Primary analog and digital return path; must be connected to low-impedance system ground plane. |
| 3: MR | Manual reset input | Logic-low (≤0.3×VDD) triggers immediate RESET assertion; internally pulled up to VDD via 90kΩ resistor. |
| 4: CT | Reset delay programming | Connect to GND via capacitor (≥130pF) for user-defined delay; open for 20ms or tied to VDD via 40–200kΩ for 300ms. |
| 5: SENSE | Monitoring input | Direct connection to 1.25V rail; comparator trips at 1.16V with 1–2.5% hysteresis to prevent noise-induced false resets. |
| 6: VDD | Power supply input | Accepts 1.7–6V; requires local 0.1μF ceramic decoupling capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 1.25V monitoring threshold | Eliminates external resistor divider, reducing BOM count and layout area while guaranteeing ±0.5% accuracy over temperature. |
| Ultra-low 0.6μA quiescent current | Extends battery life in always-on monitoring applications such as smart meters and portable medical devices. |
| Programmable reset delay (1.25ms–10s) | Enables precise alignment with processor boot sequences, FPGA configuration times, or power-rail stabilization windows. |
| Dual reset initiation (SENSE + MR) | Supports both automatic power-rail supervision and software-controlled system reset via microcontroller GPIO. |
| –40°C to +125°C operating range | Validated for use in harsh environments including BLDC motor drive power stages and rack server VRMs. |
Applications
| Rack Server Motherboard | Electricity Meter |
|---|---|
Use Scenario: Monitors 1.25V core voltage for CPU/GPU VRM outputs and memory interface rails. IC Role / Device Role / Timing Role: Supervisory circuit asserting open-drain RESET to motherboard CPLD upon undervoltage detection. Use Value: Prevents corrupted firmware execution during brownout by enforcing minimum 20ms reset hold time after rail recovery. |
Use Scenario: Ensures reliable startup and fault recovery in battery-backed metrology SoCs operating from 3.3V main supply. IC Role / Device Role / Timing Role: Resets metering ASIC when 1.25V reference rail drops below specification during AC line sag. Use Value: Maintains data integrity during grid instability by coupling MR to tamper-detection logic for forced reinitialization. |
| DC-input BLDC Motor Drive | Surgical Equipment |
Use Scenario: Supervises isolated 1.25V gate driver bias supply derived from DC bus via flyback converter. IC Role / Device Role / Timing Role: Generates fail-safe shutdown signal to IGBT gate driver IC upon supply droop during high-current transients. Use Value: Prevents shoot-through failure by holding RESET asserted for ≥100ms after rail recovery, ensuring full gate discharge. |
Use Scenario: Provides redundant power-on reset for FPGA-based imaging controller in battery-powered handheld ultrasound units. IC Role / Device Role / Timing Role: Dual-role supervisor-monitors 1.25V FPGA core rail and accepts MR from safety interlock switch. Use Value: Meets IEC 60601-1 requirements by guaranteeing deterministic reset behavior under single-fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G125DBVR | Same pinout and threshold, but higher quiescent current (1.1μA typical) and wider VIT tolerance (±1%). | Less suitable for ultra-low-power battery systems; acceptable for cost-sensitive industrial controls where 1% accuracy suffices. | Select TPS3808G125DBVR only if lower unit cost outweighs 85% higher IDD and relaxed accuracy. |
| MAX6326LT125T | Fixed 1.25V threshold, 1.6μA IDD, 200ms fixed delay (no CT programmability), SOT-23-5 package (no MR pin). | Lacks manual reset and adjustable delay; limited to simple POR applications without software-initiated reset capability. | Choose MAX6326LT125T only when MR functionality and delay flexibility are unnecessary and board space permits SOT-23-5 footprint. |
Compared with TPS3808EG125DBVR, TPS3808G125DBVR trades ultra-low power and precision for cost, while MAX6326LT125T sacrifices MR input and delay configurability for simpler integration-making TPS3808EG125DBVR optimal for designs requiring guaranteed low-power supervision with full reset control.
Availability
TPS3808EG125DBVR is available at Aetrix Electronics and suitable for rack server motherboards, electricity meters, and DC-input BLDC motor drives requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TPS3808EG125DBVR 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 TPS3808E product line was engineered specifically for ultra-low-power, high-accuracy voltage monitoring in mission-critical embedded systems-including automotive, industrial, and medical applications-where deterministic reset behavior and long-term stability are mandatory.
FAQ
What is the exact threshold voltage and accuracy of the TPS3808EG125DBVR?
The TPS3808EG125DBVR has a nominal threshold voltage of 1.16V, corresponding to 1.25V rail monitoring with ±0.5% accuracy over –40°C to +125°C. This specification is guaranteed per TI's electrical characteristics table and validated using precision bandgap reference architecture-not inferred from family-level data.
How is the reset delay configured on the TPS3808EG125DBVR?
The TPS3808EG125DBVR reset delay is set via the CT pin: leaving it open yields 20ms, connecting it to VDD through a 40–200kΩ resistor gives 300ms, and connecting it to GND via a capacitor (≥130pF) enables user-programmable delays from 1.25ms to 10s. The delay is generated by an internal 220nA current source charging the external capacitor.
Does the TPS3808EG125DBVR require an external pull-up resistor on the RESET pin?
Yes, the TPS3808EG125DBVR RESET pin is open-drain and requires an external pull-up resistor between 10kΩ and 1MΩ. This resistor sets the high-state voltage (up to 6V) and ensures proper logic levels for the target microprocessor's reset input, as explicitly required in the device's functional description and pin table.
Can the TPS3808EG125DBVR monitor voltages other than 1.25V?
No-the TPS3808EG125DBVR is factory-trimmed for fixed 1.25V rail monitoring (1.16V trip point) and does not support adjustable thresholds. For non-standard rails, TI offers the TPS3808EG01DBVR (adjustable down to 0.405V) or other fixed-threshold variants like TPS3808EG33DBVR (3.3V).
What is the maximum operating supply voltage for the TPS3808EG125DBVR?
The TPS3808EG125DBVR supports a supply voltage range of 1.7V to 6V on the VDD pin, as defined in the Recommended Operating Conditions table. Operation beyond 6V violates absolute maximum ratings and may cause permanent damage, per Section 6.1 of the official datasheet.
TPS3808EG125DBVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- Type:
- Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 1.16V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 180ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
TPS3808EG125DBVR FAQ
1.How can I place an order for TPS3808EG125DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3808EG125DBVR 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 TPS3808EG125DBVR reliable?
The price and inventory of TPS3808EG125DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3808EG125DBVR is usually 5 days.
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4.How is shipping managed for TPS3808EG125DBVR?
TPS3808EG125DBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3808EG125DBVR 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 TPS3808EG125DBVR?
For technical support, including TPS3808EG125DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3808EG125DBVR requirements.
6.How does Aetrix verify that TPS3808EG125DBVR is sourced from the original manufacturer or authorized distributors?
All TPS3808EG125DBVR 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 TPS3808EG125DBVR meets industry standards.
7.What is the process for return or replacement of TPS3808EG125DBVR?
All TPS3808EG125DBVR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3808EG125DBVR, 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 TPS3808EG125DBVR part is unused and in its original packaging.
Return procedure for TPS3808EG125DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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