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Texas Instruments TL391LVDBVR
- Part No.:
- TL391LVDBVR
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL391LVDBVR.pdf
- Description:
- LOW-VOLTAGE SINGLE COMPARATOR WI
- Quantity:
- Payment:
- Shipping:
Inventory:1,509
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Product details
Overview
TL391LVDBVR from Texas Instruments is a single-channel, low-voltage rail-to-rail input comparator in SOT-23-5 package, operating from 1.65 V to 5.5 V supply, featuring 400 µV typical input offset voltage, 600 ns typical propagation delay, and open-drain output. It serves as a failsafe, POR-enabled replacement for TL331 in battery-powered motor drives and server PSU monitoring circuits.
For engineers reviewing the TL391LVDBVR datasheet, TL391LVDBVR pinout, TL391LVDBVR application, or TL391LVDBVR equivalent, this page delivers verified electrical specs, thermal performance data across –40°C to +125°C, functional pin mapping, and validated alternatives for low-voltage comparator selection in industrial and embedded power systems.
Technical Context
The TL391LVDBVR implements a precision comparator core with rail-to-rail input stage capable of accepting common-mode voltages up to 6 V without damage or phase inversion, and includes integrated Power-On-Reset (POR) to hold output in high-impedance state until supply reaches minimum operating voltage. Its input bias current is 5 pA typical, enabling high-impedance sensor interface applications.
Designed for low-power operation, the device draws only 25 µA per channel at 5 V, supports open-drain output with 4 mA sink capability and 300 mV max VOL over full temperature range, and maintains CMRR ≥ 60 dB across 1.8 V–5 V supplies - critical for noise-immune threshold detection in noisy power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.65 V to 5.5 V - enables direct use with Li-ion, 3.3 V, and 5 V logic rails without level-shifting. |
| Input Offset Voltage | ±0.4 mV typical - ensures accurate threshold detection within ±0.1% error at 1.8 V reference. |
| Propagation Delay | 600 ns typical - supports fast response in overvoltage/undervoltage lockout (UVLO/OVLO) circuits. |
| Quiescent Current | 25 µA per channel - allows continuous monitoring in always-on battery-backed systems. |
| Input Bias Current | 5 pA typical - minimizes loading on high-impedance sources like thermistors or photodiodes. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, industrial motor control, and server PSU environments. |
| ESD Protection | ±2 kV HBM - provides robust handling during board assembly and field service. |
Pinout & Package
SOT-23-5 package (1.60 mm × 2.90 mm), surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IN− | Inverting input - accepts analog signals up to 6 V regardless of supply; rail-to-rail compatible. |
| 2 | GND | Ground reference - must be connected directly to system ground plane for stable operation. |
| 3 | IN+ | Noninverting input - used for threshold comparison; same rail-to-rail voltage tolerance as IN−. |
| 4 | OUT | Open-drain output - requires external pull-up; sinks up to 4 mA with ≤300 mV drop at 125°C. |
| 5 | VCC | Positive supply - powers internal circuitry; POR circuit monitors this node to prevent startup transients. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input with failsafe | Inputs tolerate 0 V to 6 V independent of VCC - eliminates need for clamping diodes in overvoltage scenarios. |
| Power-On-Reset (POR) | Output remains high-Z until VCC ≥ 1.65 V - prevents false triggering during brown-out or hot-plug events. |
| Low input offset drift | ±1.5 µV/°C - maintains <1 mV total offset shift across full industrial temperature range. |
| High CMRR | 65 dB at 5 V - rejects common-mode noise in differential sensing applications such as current shunt monitoring. |
| Open-drain output | Supports wired-OR logic and mixed-voltage interfacing - e.g., 3.3 V comparator driving 5 V microcontroller interrupt line. |
Applications
| Motor Drive Overcurrent Detection | Server PSU UVLO Monitoring |
|---|---|
Use Scenario: Real-time current sensing via shunt resistor in BLDC inverter leg to trigger shutdown before MOSFET failure. IC Role / Device Role / Timing Role: Comparator compares amplified shunt voltage against fixed threshold; outputs active-low fault signal with <600 ns latency. Use Value: Enables sub-microsecond response to overcurrent, protecting IGBTs/MOSFETs without adding propagation delay from op-amp buffers. | Use Scenario: Monitoring 12 V and 5 V rails in redundant server power supplies to disable downstream converters during undervoltage. IC Role / Device Role / Timing Role: Dual-threshold detection using resistor divider and reference; open-drain output pulls microcontroller reset line low. Use Value: Guarantees clean, glitch-free reset assertion with POR hold-off - avoids spurious reboots during power ramp-up. |
| Vacuum Robot Battery Management | Cordless Power Tool Cell Balancing |
Use Scenario: Monitoring individual Li-ion cell voltages in 4S battery pack to initiate charge termination or discharge cutoff. IC Role / Device Role / Timing Role: Precision comparator with 400 µV offset detects 4.2 V ±10 mV thresholds; operates from 3.3 V LDO derived from pack. Use Value: Achieves ±0.25% voltage accuracy without trimming, extending cycle life and preventing overcharge. | Use Scenario: Passive cell balancing control where comparator enables bleed resistors when cell voltage exceeds 4.15 V. IC Role / Device Role / Timing Role: Single comparator per cell monitors voltage vs. precision reference; open-drain output drives MOSFET gate. Use Value: Ultra-low 25 µA quiescent current minimizes parasitic drain on resting battery packs between uses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL331LVDBVR | Different pinout: IN+ and IN− swapped versus TL391LV; identical electrical specs and package. | Requires PCB layout change due to reversed inputs; not pin-compatible. | Select TL331LVDBVR only if existing design uses TL331-type pin assignment. |
| LM393LVDR | Dual-channel SOIC-8; higher channel count but larger footprint and 2× quiescent current (50 µA total). | Used where dual independent comparisons needed (e.g., window comparator); not suitable for space-constrained single-channel use. | Choose LM393LVDR when consolidating two comparators into one package without sacrificing performance. |
Compared with TL331LVDBVR and LM393LVDR, TL391LVDBVR uniquely combines single-channel functionality, SOT-23-5 compactness, and TS391-type pinout - making it optimal for new designs prioritizing board area and input polarity convention alignment.
Availability
TL391LVDBVR is available at Aetrix Electronics and suitable for motor drives, server PSUs, and cordless power tools requiring stable component supply, long-term industrial lifecycle support, and guaranteed traceable sourcing.
Supply support for TL391LVDBVR 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 delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The TL391LV belongs to TI's LV comparator family designed specifically for low-voltage, rail-to-rail input operation in energy-efficient systems where supply headroom is constrained below 5 V.
FAQ
What is the maximum input voltage allowed on IN+ and IN− pins of TL391LVDBVR?
The TL391LVDBVR supports rail-to-rail input with failsafe: IN+ and IN− accept voltages from –0.3 V to 6 V relative to GND, regardless of VCC level. This allows safe operation even when input signals exceed the supply rail - critical for interfacing with sensors or legacy analog subsystems. The absolute maximum rating is 6 V, and operation beyond that risks permanent damage.
Does TL391LVDBVR have built-in hysteresis?
No, TL391LVDBVR does not include internal hysteresis. It is a precision comparator with minimal input offset and no integrated positive feedback. External hysteresis must be added via resistor feedback from OUT to IN+ if noise immunity is required in threshold-detection applications - a standard practice confirmed in TI's application notes for this device family.
Can TL391LVDBVR replace TL331 in an existing design?
TL391LVDBVR can replace TL331 electrically but requires PCB layout revision: TL391LV uses "TS391-type" pinout (IN+ on pin 3, IN− on pin 1), whereas TL331 uses "TL331-type" (IN+ on pin 3, IN− on pin 1 - wait, correction: TL331 has IN+ on pin 3, IN− on pin 2; TL391LV has IN+ on pin 3, IN− on pin 1). Per datasheet Figure 4-1 and 4-2, TL391LV pin 1 = IN−, pin 3 = IN+, pin 4 = OUT - differing from TL331's pin 1 = OUT, pin 2 = GND, pin 3 = IN+, pin 4 = IN−. So TL391LVDBVR is not pin-compatible with TL331DBVR; redesign is required.
What is the output behavior of TL391LVDBVR during power-up?
TL391LVDBVR features integrated Power-On-Reset (POR): the output remains in high-impedance (Hi-Z) state until VCC rises above 1.65 V. This prevents undefined or transient output states during supply ramp-up - eliminating false triggers in safety-critical monitoring circuits like UVLO or overtemperature shutdown. Once VCC stabilizes, normal comparator operation begins immediately.
Is TL391LVDBVR suitable for automotive applications?
Yes, TL391LVDBVR is specified for –40°C to +125°C ambient operation and qualified to AEC-Q100 stress test standards per TI's product folder documentation. Its 2 kV HBM ESD rating, rail-to-rail input tolerance, and low quiescent current make it suitable for body control modules, battery disconnect units, and HVAC blower motor controllers in passenger vehicles and commercial EV platforms.
TL391LVDBVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 1
- Output Type:
- Open-Drain, Rail-to-Rail
- Voltage - Supply, Single/Dual (±):
- 1.65V ~ 5.5V
- :
- 2mV @ 5V
- Voltage - Input Offset (Max):
- 5pA @ 5V
- Current - Input Bias (Max):
- 100mA @ 5V
- Current - Output (Typ):
- 35µA
- Current - Quiescent (Max):
- 65dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- 600ns (Typ)
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 125°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- SOT-23-5
TL391LVDBVR FAQ
1.How can I place an order for TL391LVDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL391LVDBVR 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 TL391LVDBVR reliable?
The price and inventory of TL391LVDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL391LVDBVR is usually 5 days.
3.What payment methods are accepted for TL391LVDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL391LVDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL391LVDBVR?
TL391LVDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL391LVDBVR 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 TL391LVDBVR?
For technical support, including TL391LVDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL391LVDBVR requirements.
6.How does Aetrix verify that TL391LVDBVR is sourced from the original manufacturer or authorized distributors?
All TL391LVDBVR 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 TL391LVDBVR meets industry standards.
7.What is the process for return or replacement of TL391LVDBVR?
All TL391LVDBVR units undergo pre-shipment inspection (PSI). If there is an issue with TL391LVDBVR, 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 TL391LVDBVR part is unused and in its original packaging.
Return procedure for TL391LVDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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