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Texas Instruments PTPS3808EG33DBVR
- Part No.:
- PTPS3808EG33DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
PTPS3808EG33DBVR.pdf
- Description:
- LOW-QUIESCENT CURRENT SUPERVISOR
- Quantity:
- Payment:
- Shipping:
Inventory:3,006
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Product details
Overview
TPS3808EG33DBVR from Texas Instruments is a low-quiescent-current, fixed-threshold supervisory circuit designed to monitor 3.3V power rails and assert an open-drain RESET signal upon undervoltage detection. It features 1% typical threshold accuracy (3.07V), 0.6μA typical quiescent current, user-programmable reset delay from 1.25ms to 10s via external capacitor on CT pin, and operates across –40°C to +125°C. It is used in rack server motherboards and surgical equipment for reliable power-on reset sequencing.
For engineers reviewing the TPS3808EG33DBVR datasheet, TPS3808EG33DBVR pinout, TPS3808EG33DBVR application, or TPS3808EG33DBVR equivalent, key selection considerations include its 3.07V undervoltage threshold, SOT-23-6 package compatibility, open-drain RESET output requiring external pull-up, manual reset (MR) input with 90kΩ internal pull-up, and temperature-stable timing performance over industrial and automotive-grade operating range.
Technical Context
The TPS3808EG33DBVR implements a precision voltage comparator with 0.5% threshold accuracy referenced to an internal bandgap, coupled with a programmable RC-based timer using a 220nA on-chip current source to charge the external CT capacitor. Its functional architecture separates monitoring (SENSE pin), control (MR pin), and timing (CT pin) paths to avoid cross-coupling during transient events.
It operates in three distinct functional modes: normal operation above VDD(min) = 1.7V, undefined behavior below VPOR = 1V, and forced RESET assertion between VPOR and VDD(min). The device uses hysteresis (1–2.5%) to prevent chatter during threshold crossings and supports glitch immunity of 5µs on SENSE and 50ns on MR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Threshold Voltage | 3.07V ±0.5% - precisely monitors nominal 3.3V rail with minimal tolerance drift over temperature |
| 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 - set by external capacitor on CT pin; supports both fast microcontroller boot and slow power-rail stabilization |
| Operating Temperature | –40°C to +125°C - fully specified for under-hood automotive, industrial motor drives, and medical equipment |
| Output Type | Open-drain RESET - allows level-shifting up to 6V with external pull-up, compatible with diverse MCU reset inputs |
| Supply Voltage Range | 1.7V to 6V - powers from single Li-ion cell or wide-input DC-DC outputs without external regulation |
| Hysteresis | 1–2.5% of VIT - prevents oscillation during slow-rising/falling supply transitions |
Pinout & Package
TPS3808EG33DBVR is housed in a 6-pin SOT-23 (DBV) package measuring 2.90mm × 1.60mm, optimized for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Open-drain output | Asserts low when SENSE < 3.07V or MR = low; requires 10kΩ–1MΩ external pull-up to define logic-high voltage |
| 2: GND | Ground reference | Primary analog and digital return path; must be connected to low-impedance system ground plane |
| 3: MR | Manual reset input | Active-low control: logic low ≤0.3×VDD forces RESET assertion; internally pulled up to VDD via 90kΩ resistor |
| 4: CT | Reset delay programming | Connect to GND via capacitor ≥130pF to set delay (1.25ms–10s); open = 20ms, tied to VDD via 40–200kΩ = 300ms |
| 5: SENSE | Voltage monitoring input | Direct connection to 3.3V rail; comparator trips at 3.07V with hysteresis; immune to ≤5µs transients at ≥5% overdrive |
| 6: VDD | Power supply input | Accepts 1.7–6V; requires 0.1µF ceramic decoupling capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.07V threshold | Eliminates external resistor divider, reducing BOM count and layout area while guaranteeing 1% accuracy at 3.3V |
| 0.6μA quiescent current | Enables continuous supervision in energy-constrained systems such as portable medical devices and smart meters |
| Programmable reset delay | Supports precise timing alignment with processor boot requirements-from 1.25ms for fast MCUs to 10s for slow power-up sequences |
| Separate SENSE and VDD pins | Allows independent monitoring of remote voltage rails (e.g., VCORE) while powering from local 3.3V domain |
| –40°C to +125°C operation | Validated for use in harsh environments including BLDC motor drive power stages and surgical equipment enclosures |
Applications
| Rack Server Motherboard | Electricity Meter |
|---|---|
Use Scenario: Monitors 3.3V management rail during cold start and brownout conditions in multi-CPU server platforms. IC Role / Device Role / Timing Role: Supervisory circuit asserting open-drain RESET to all CPUs and PMICs until stable 3.3V is confirmed. Use Value: Prevents firmware corruption by ensuring synchronized reset release only after full rail stabilization, leveraging 3.07V threshold accuracy and 20ms default delay. | Use Scenario: Provides fail-safe reset for metrology SoC during AC line interruptions and battery backup transitions. IC Role / Device Role / Timing Role: Undervoltage detector on isolated 3.3V auxiliary supply, triggering hardware reset before ADC reference collapse. Use Value: Guarantees meter data integrity via 0.6μA quiescent current and –40°C to +125°C operation, meeting IEC 62053 accuracy requirements. |
| DC-input BLDC Motor Drive | Surgical Equipment |
Use Scenario: Validates gate driver supply voltage before enabling IGBT/SiC half-bridge PWM in high-reliability motion control. IC Role / Device Role / Timing Role: Safety-critical supervisor on 3.3V logic rail, asserting RESET if sensed voltage drops below 3.07V during EMI transients. Use Value: Mitigates shoot-through risk using 5µs SENSE glitch immunity and hysteresis, compliant with ISO 13849 PLd functional safety targets. | Use Scenario: Ensures deterministic boot of FPGA-based imaging controller after power cycling in sterilizable handheld units. IC Role / Device Role / Timing Role: Primary reset generator for radiation-tolerant microcontroller, with MR pin wired to emergency stop logic. Use Value: Delivers 125°C-rated reliability and 90kΩ MR pull-up for fail-safe manual reset without external components, supporting FDA Class II device certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Same pinout and threshold (3.07V), but higher 1.5μA max IDD vs 1.5μA typ for TPS3808EG33DBVR; no AEC-Q100 qualification | Targeted at commercial/industrial use only; lacks extended temperature validation beyond 125°C junction | Select when cost sensitivity outweighs ultra-low-IDD requirement and automotive-grade validation is unnecessary |
| MAX6326LT33D3+T | Fixed 3.3V threshold (3.08V), 1.6μA max IDD, SOT-23-5 package (no MR pin), 200ms fixed delay | Lacks manual reset and programmable delay; suited for simpler, lower-cost systems where MR and timing flexibility are not required | Select when board space is constrained and only basic reset functionality is needed-note pin count and feature reduction |
Compared with TPS3808EG33DBVR, TPS3808G33DBVR offers identical functionality at higher typical current draw and reduced thermal margin, while MAX6326LT33D3+T trades MR capability and delay programmability for smaller footprint and lower unit cost-making each suitable for distinct design priorities.
Availability
TPS3808EG33DBVR is available at Aetrix Electronics and suitable for rack server motherboard, electricity meter, and DC-input BLDC motor drive applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for TPS3808EG33DBVR 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 specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and high-reliability ICs.
The TPS3808E product line was engineered for ultra-low-power, high-accuracy voltage supervision in mission-critical systems-including industrial automation, medical instrumentation, and automotive subsystems-where reset integrity directly impacts functional safety.
FAQ
What is the exact undervoltage threshold voltage of the TPS3808EG33DBVR?
The TPS3808EG33DBVR has a factory-set undervoltage threshold of 3.07V with ±0.5% accuracy over –40°C to +125°C. This value corresponds to nominal 3.3V rail monitoring and is specified in the Electrical Characteristics table of the official datasheet (SNVSCE0B). The threshold is derived from a precision internal reference and does not require external calibration. TPS3808EG33DBVR maintains this accuracy across its full operating temperature and supply voltage range.
How is the reset delay time configured on the TPS3808EG33DBVR?
The reset delay time on the TPS3808EG33DBVR is configured via the CT pin: leaving CT open yields a 20ms typical delay; connecting CT to VDD through a 40kΩ–200kΩ resistor sets 300ms; connecting CT 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. TPS3808EG33DBVR's timing is characterized across temperature and supply voltage per Section 6.6 of the datasheet.
Does the TPS3808EG33DBVR require an external pull-up resistor on the RESET pin?
Yes, the TPS3808EG33DBVR features an open-drain RESET output and requires an external pull-up resistor between RESET and the target logic supply (typically 1.8V–6V). The recommended value is 10kΩ to 1MΩ. Without this resistor, the RESET signal cannot attain a valid high logic level. This design allows voltage-level translation and shared reset buses. TPS3808EG33DBVR's RESET pin sinks current only when asserted, making it compatible with mixed-voltage systems.
Can the TPS3808EG33DBVR monitor a voltage rail different from its VDD supply?
Yes, the TPS3808EG33DBVR supports independent monitoring via separate SENSE and VDD pins. For example, VDD can be powered from a local 3.3V LDO while SENSE monitors a remote 1.2V core rail (using an external resistor divider for adjustable variants) or a 3.3V system rail directly. This isolation prevents supply noise coupling and enables flexible power-domain supervision. TPS3808EG33DBVR's SENSE input accepts 0–6V, and its threshold remains fixed at 3.07V regardless of VDD value within 1.7–6V.
What is the maximum operating junction temperature specification for the TPS3808EG33DBVR?
The TPS3808EG33DBVR is fully specified for operation from –40°C to +125°C junction temperature (TJ). This rating is validated per the Recommended Operating Conditions table (Section 6.3) and Thermal Information (Section 6.4) in the datasheet. The device's low 0.6μA quiescent current minimizes self-heating, and its SOT-23-6 package exhibits a junction-to-board thermal resistance (RθJB) of 91.7°C/W. TPS3808EG33DBVR maintains parameter integrity-including threshold accuracy and delay stability-across this full range.
PTPS3808EG33DBVR 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:
- 3.07V
- 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
PTPS3808EG33DBVR FAQ
1.How can I place an order for PTPS3808EG33DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for PTPS3808EG33DBVR 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 PTPS3808EG33DBVR reliable?
The price and inventory of PTPS3808EG33DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PTPS3808EG33DBVR is usually 5 days.
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PTPS3808EG33DBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PTPS3808EG33DBVR 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 PTPS3808EG33DBVR?
For technical support, including PTPS3808EG33DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PTPS3808EG33DBVR requirements.
6.How does Aetrix verify that PTPS3808EG33DBVR is sourced from the original manufacturer or authorized distributors?
All PTPS3808EG33DBVR 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 PTPS3808EG33DBVR meets industry standards.
7.What is the process for return or replacement of PTPS3808EG33DBVR?
All PTPS3808EG33DBVR units undergo pre-shipment inspection (PSI). If there is an issue with PTPS3808EG33DBVR, 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 PTPS3808EG33DBVR part is unused and in its original packaging.
Return procedure for PTPS3808EG33DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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