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Texas Instruments TPS3808EG12DBVR
- Part No.:
- TPS3808EG12DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
TPS3808EG12DBVR.pdf
- Description:
- 600NA ULTRA-LOW QUIESCENT CURREN
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
TPS3808EG12DBVR from Texas Instruments is a low-quiescent-current, programmable-delay supervisory circuit designed to monitor 1.2V power rails with ±0.5% threshold accuracy (1.12V nominal trip point), deliver 0.6μA typical supply current, and support user-adjustable reset delays from 1.25ms to 10s via external capacitor on CT pin. It operates across –40°C to +125°C and features separate SENSE and VDD pins for accurate rail monitoring in battery-powered or thermally demanding systems.
For engineers reviewing the TPS3808EG12DBVR datasheet, TPS3808EG12DBVR pinout, TPS3808EG12DBVR application, or TPS3808EG12DBVR equivalent, key selection considerations include its 1.12V undervoltage threshold tolerance, open-drain RESET output requiring external pull-up, manual reset (MR) input with 90kΩ internal pull-up, SOT-23-6 package footprint, and temperature-stable delay timing over industrial and automotive-grade operating ranges.
Technical Context
The TPS3808EG12DBVR implements a precision voltage comparator with built-in hysteresis (1–2.5%) referenced to an internal 0.4V bandgap, enabling reliable 1.2V rail monitoring without external resistor dividers. Its reset assertion logic responds to either SENSE voltage falling below 1.12V or MR pin driven low, holding RESET asserted for a user-programmable delay after both conditions clear.
Delay timing is controlled by an on-chip 220nA current source charging an external capacitor on the CT pin - values ≥130pF yield delays from 1.25ms to 10s; open CT yields 20ms; CT tied to VDD via 40–200kΩ yields 300ms. The open-drain RESET output supports voltages up to 6V and requires a 10kΩ–1MΩ pull-up resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Threshold Voltage | 1.12V ±0.5% - precise undervoltage detection for 1.2V rails without external divider |
| Quiescent Current | 0.6μA typical at 3.3V - enables multi-year battery life in always-on monitoring applications |
| Reset Delay Range | 1.25ms to 10s - programmable via external CT capacitor (≥130pF), supporting diverse MCU boot timing requirements |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, industrial motor drives, and medical equipment |
| Supply Voltage Range | 1.7V to 6V - compatible with wide-input DC-DC outputs and legacy 5V/3.3V systems |
| Output Type | Open-drain RESET - allows level-shifting above VDD (up to 6V) and wired-OR reset bus configurations |
| Hysteresis | 1–2.5% of VIT - prevents chatter during slow-rising/falling rail transitions |
Pinout & Package
TPS3808EG12DBVR is housed in a compact 6-pin SOT-23 (DBV) package measuring 2.90mm × 1.60mm, optimized for space-constrained PCB layouts in server, motor control, and portable medical devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RESET | Open-drain output | Asserts low when SENSE < 1.12V or MR = low; requires external pull-up (10kΩ–1MΩ); supports voltage levels up to 6V |
| GND | Ground reference | Common return path for internal circuitry and external bypass capacitors; must be low-impedance |
| MR | Manual reset input | Logic-low (≤0.3×VDD) triggers immediate RESET assertion; internally pulled up to VDD via 90kΩ resistor |
| CT | Delay timing control | Connects to external capacitor (≥130pF) to set reset delay; open = 20ms, tied to VDD = 300ms |
| SENSE | Voltage monitoring input | Direct connection to monitored 1.2V rail; high-impedance input (≤1.25μA leakage) minimizes loading |
| VDD | Supply input | Power source (1.7–6V); requires 0.1μF ceramic decoupling capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 1.12V threshold | Eliminates external resistor divider, reducing BOM count and layout area for 1.2V rail supervision |
| 0.6μA quiescent current | Enables continuous monitoring in energy-harvesting or coin-cell-powered systems without measurable battery drain |
| Programmable reset delay | Supports exact timing alignment with MCU boot sequences, FPGA configuration windows, or power-stage soft-start intervals |
| Separate SENSE/VDD pins | Allows monitoring of independent voltage domains (e.g., core vs. I/O rails) while powering device from stable auxiliary supply |
| –40°C to +125°C operation | Validated performance across full junction temperature range, eliminating derating concerns in high-ambient environments |
Applications
| Rack Server Motherboard | Electricity Meter |
|---|---|
Use Scenario: Monitors 1.2V CPU core voltage during cold start and thermal throttling events to prevent firmware corruption. IC Role / Device Role / Timing Role: Supervisory circuit asserting open-drain RESET to processor upon undervoltage, with 20ms fixed delay matching BIOS initialization window. Use Value: Prevents system lockup during transient rail dips caused by high-current switching loads or aging power supplies. | Use Scenario: Ensures reliable microcontroller reset during AC mains brownouts or battery backup switchover in smart metering units. IC Role / Device Role / Timing Role: Undervoltage detector for 1.2V RTC and metrology ASIC supply, using CT capacitor to set 100ms delay aligned with backup capacitor discharge profile. Use Value: Guarantees clean restart of timekeeping and measurement functions without data loss during grid instability. |
| DC-Input BLDC Motor Drive | Surgical Equipment |
Use Scenario: Supervises 1.2V gate driver bias supply in high-reliability motor controllers where rail collapse could cause shoot-through faults. IC Role / Device Role / Timing Role: Fault-monitoring IC triggering hardware reset of motor control MCU when SENSE drops below 1.12V, with 5ms delay to filter switching noise. Use Value: Adds fail-safe layer preventing destructive MOSFET conduction during power stage transients or component failure. | Use Scenario: Provides certified reset assurance for 1.2V FPGA configuration memory in battery-powered surgical robots operating near MRI fields. IC Role / Device Role / Timing Role: High-accuracy supervisor asserting RESET during battery voltage sag below 1.12V, with MR pin tied to safety interlock signal for emergency shutdown. Use Value: Meets IEC 60601-1 requirements for deterministic fault response and eliminates risk of undefined logic states during critical procedures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G12DBVR | Same pinout and threshold (1.12V), but higher quiescent current (1.1μA typical) and no AEC-Q100 qualification | Not rated for automotive temperature range; suitable only for commercial-grade industrial applications | Select when cost sensitivity outweighs ultra-low-power requirement and extended temperature is unnecessary |
| MAX6326LT12D3+T | Fixed 1.2V threshold (±1.5%), 1.5μA quiescent current, 200ms fixed delay, SOT-23-5 package (no MR pin) | Lacks manual reset input and programmable delay; smaller footprint but less flexible timing control | Select when board space is critical and fixed 200ms delay suffices without MR functionality |
Compared with TPS3808G12DBVR, the TPS3808EG12DBVR delivers 45% lower quiescent current and guaranteed operation to +125°C, making it preferable for battery-backed or thermally aggressive designs; versus MAX6326LT12D3+T, it offers MR capability, wider delay range, and tighter threshold accuracy at the cost of one additional pin and slightly larger package.
Availability
TPS3808EG12DBVR is available at Aetrix Electronics and suitable for rack server motherboard design, electricity meter certification, and DC-input BLDC motor drive production requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for TPS3808EG12DBVR 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The TPS3808E product line was engineered specifically for ultra-low-power, high-accuracy power-rail supervision in thermally demanding environments - targeting applications where battery life, reliability, and precise voltage thresholding are non-negotiable.
FAQ
What is the exact undervoltage threshold voltage of the TPS3808EG12DBVR?
The TPS3808EG12DBVR has a nominal undervoltage threshold of 1.12V with ±0.5% accuracy over –40°C to +125°C. This corresponds to monitoring a 1.2V nominal supply rail and is factory-trimmed - no external resistor divider is required. The threshold exhibits <±0.2% variation across temperature, as confirmed in Figure 7-5 of the datasheet.
How do I configure the reset delay time for the TPS3808EG12DBVR?
The TPS3808EG12DBVR supports three delay configurations: leave CT pin open for 20ms, connect CT to VDD via 40–200kΩ for 300ms, or connect CT to GND via a capacitor ≥130pF for user-adjustable delays from 1.25ms to 10s. Equation 1 in the datasheet (CT[nF] = tD[s] × 175 – 0.5) calculates required capacitance. Ceramic capacitors are mandatory due to low leakage requirements.
Does the TPS3808EG12DBVR require an external pull-up resistor on the RESET pin?
Yes, the TPS3808EG12DBVR features an open-drain RESET output and requires an external pull-up resistor between RESET and the target supply rail (e.g., 3.3V or 5V). The datasheet specifies 10kΩ to 1MΩ; 100kΩ is commonly used. This resistor enables level-shifting (RESET can rise to 6V) and supports wired-OR reset bus topologies in multi-IC systems.
Can the TPS3808EG12DBVR monitor voltage rails other than 1.2V?
No - the TPS3808EG12DBVR is a fixed-threshold variant calibrated exclusively for 1.2V nominal rails (1.12V trip point). To monitor other rails, select alternate part numbers: TPS3808EG33DBVR for 3.3V (3.07V), TPS3808EG18DBVR for 1.8V (1.67V), or TPS3808EG01DBVR for adjustable thresholds down to 0.405V using an external resistor divider.
What is the maximum supply voltage the TPS3808EG12DBVR can tolerate on its VDD pin?
The TPS3808EG12DBVR supports a VDD supply range of 1.7V to 6V per Recommended Operating Conditions (Section 6.3). Absolute maximum rating is 6.5V, but operation above 6V risks permanent damage. For robustness in noisy environments, TI recommends placing a 0.1μF ceramic capacitor within 2mm of the VDD pin to suppress supply transients.
TPS3808EG12DBVR 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:
- 1.12V
- 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
TPS3808EG12DBVR FAQ
1.How can I place an order for TPS3808EG12DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3808EG12DBVR 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 TPS3808EG12DBVR reliable?
The price and inventory of TPS3808EG12DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3808EG12DBVR is usually 5 days.
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TPS3808EG12DBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3808EG12DBVR 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 TPS3808EG12DBVR?
For technical support, including TPS3808EG12DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3808EG12DBVR requirements.
6.How does Aetrix verify that TPS3808EG12DBVR is sourced from the original manufacturer or authorized distributors?
All TPS3808EG12DBVR 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 TPS3808EG12DBVR meets industry standards.
7.What is the process for return or replacement of TPS3808EG12DBVR?
All TPS3808EG12DBVR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3808EG12DBVR, 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 TPS3808EG12DBVR part is unused and in its original packaging.
Return procedure for TPS3808EG12DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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