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Texas Instruments TL391LVQDBVRQ1
- Part No.:
- TL391LVQDBVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL391LVQDBVRQ1.pdf
- Description:
- AUTOMOTIVE LOW-VOLTAGE SINGLE CO
- Quantity:
- Payment:
- Shipping:
Inventory:1,478
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Product details
Overview
TL391LVQDBVRQ1 from Texas Instruments is an automotive-grade single open-drain rail-to-rail input voltage comparator in SOT-23-5 package, operating from 1.65 V to 5.5 V supply, with 400 µV typical input offset voltage, 600 ns typical propagation delay, and Power-On-Reset (POR) for known startup behavior - used in motor drive feedback, server PSU overvoltage detection, and infotainment system power sequencing.
For engineers reviewing the TL391LVQDBVRQ1 datasheet, TL391LVQDBVRQ1 pinout, TL391LVQDBVRQ1 application, or TL391LVQDBVRQ1 equivalent, this page delivers verified electrical specs, AEC-Q100 Grade 1 qualification details, thermal metrics for SOT-23-5, and direct alternatives for low-voltage automotive comparator replacement.
Technical Context
The TL391LVQDBVRQ1 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 internal POR circuitry that holds output in high-impedance state until supply reaches minimum operating voltage. Its architecture supports fail-safe operation during power-up/down transients.
It features ultra-low input bias current (5 pA typical) and low quiescent current (25 µA per channel), enabling use in battery-sensitive automotive subsystems. The open-drain output requires external pull-up and supports wired-OR logic, level translation, and interface with diverse logic families.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.65 V to 5.5 V - enables direct integration into 3.3 V and 1.8 V automotive domains without level-shifting. |
| Input Offset Voltage | ±0.4 mV typical - ensures accurate threshold detection in precision sensing applications like battery cell monitoring. |
| Propagation Delay | 600 ns typical at 5 V - supports real-time response in fast fault-detection circuits such as motor overcurrent protection. |
| Quiescent Current | 25 µA per channel - reduces standby power in always-on vehicle modules including body control units. |
| Input Bias Current | 5 pA typical - minimizes loading error on high-impedance sensor sources like thermistors or photodiodes. |
| Operating Temperature | –40°C to +125°C ambient - meets AEC-Q100 Grade 1 requirements for under-hood and cabin electronics. |
| ESD Rating | HBM ±2 kV, CDM ±1 kV - provides robustness against assembly and field electrostatic events in automotive production. |
Pinout & Package
SOT-23-5 package (1.60 mm × 2.90 mm), surface-mount, thermally enhanced with exposed pad option not present in DBV variant; suitable for compact PCB layouts in space-constrained automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Noninverting Input | Accepts reference or signal input up to 6 V; rail-to-rail capable with no phase reversal. |
| VCC | Positive Supply | Single supply input; powers internal biasing, POR, and output stage (1.65–5.5 V). |
| IN− | Inverting Input | Accepts sensed signal; differential pair with IN+ defines comparison threshold. |
| OUT | Open-Drain Output | Active-low sinking output; requires external pull-up for logic-level compatibility and wired-OR capability. |
| GND | Ground Reference | Return path for supply and inputs; must be low-impedance to ensure stable common-mode rejection. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-Rail Input with Failsafe | Inputs tolerate –0.3 V to 6 V regardless of supply; prevents latch-up or erroneous output during overvoltage transients. |
| Power-On-Reset (POR) | Guarantees high-Z output until VCC ≥ 1.65 V, eliminating spurious switching during cold crank or brownout recovery. |
| AEC-Q100 Qualified (Grade 1) | Validated for –40°C to +125°C ambient, HBM Class 2, CDM Class C5 - certified for safety-critical automotive subsystems. |
| Low Input Offset Drift | ±1.5 µV/°C - maintains threshold accuracy across full temperature range without calibration. |
| Open-Drain Output Architecture | Enables flexible voltage translation (e.g., 5 V logic driving 3.3 V MCU interrupt) and multi-comparator wired-OR outputs. |
Applications
| Motor Drive Protection | Server PSU Monitoring |
|---|---|
Use Scenario: Detect overcurrent in BLDC motor phase legs using shunt voltage and compare against programmable threshold. IC Role / Device Role / Timing Role: Precision comparator generating immediate fault flag via open-drain output to MCU interrupt pin. Use Value: 600 ns propagation delay enables sub-microsecond response to short-circuit events, protecting IGBTs and gate drivers. |
Use Scenario: Monitor +12 V and +5 V rails in telecom server power supplies for undervoltage lockout (UVLO) and overvoltage shutdown (OVP). IC Role / Device Role / Timing Role: Dual-threshold comparator feeding OR-gated fault signal to PMBus controller or supervisor IC. Use Value: Rail-to-rail input allows direct sensing without resistor dividers; 25 µA quiescent current minimizes standby loss in always-on monitoring circuits. |
| Infotainment Power Sequencing | Appliance Motor Control |
Use Scenario: Sequence power-up of display backlight, audio amplifier, and processor cores in automotive head unit using timed enable signals. IC Role / Device Role / Timing Role: Comparator compares RC ramp voltage against reference to generate staggered enable pulses. Use Value: POR ensures clean initial state; ±0.4 mV offset enables tight sequencing windows (<10 mV tolerance) across temperature. |
Use Scenario: Monitor brushless motor rotor position via Hall-effect sensor outputs in cordless power tools. IC Role / Device Role / Timing Role: Single comparator converts analog Hall voltage into digital commutation signal for motor driver IC. Use Value: 5 pA input bias current prevents signal attenuation in high-impedance Hall sensor interfaces, preserving timing accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL331LVQDBVRQ1 | Same SOT-23-5 package but reversed input pinout (IN+ on Pin 3, IN− on Pin 1 vs. TL391LV's IN+ on Pin 4, IN− on Pin 3); identical electrical specs. | Requires PCB layout revision due to swapped IN+/IN− pins; not drop-in compatible without trace modification. | Select TL331LVQDBVRQ1 only when legacy design uses "TL331-type" pinout; verify input polarity in schematic. |
| LM393LVDRQ1 | Dual-channel SOIC-8 device; per-channel IQ = 25 µA, same offset and delay specs, but occupies larger footprint and adds second comparator. | Applicable where dual thresholds or redundant sensing is needed; unsuitable for space-constrained single-comparator roles. | Choose LM393LVDRQ1 when board area permits and dual functionality adds value - e.g., simultaneous OVP and UVLO in PSU. |
Compared with TL331LVQDBVRQ1, TL391LVQDBVRQ1 offers inverted input pinout for TS391-compatible designs, while LM393LVDRQ1 provides dual-channel capability in SOIC-8 - both share identical AEC-Q100 Grade 1 qualification and low-voltage performance, but differ in channel count, package size, and pin assignment.
Availability
TL391LVQDBVRQ1 is available at Aetrix Electronics and suitable for motor drives, server PSUs, and infotainment systems requiring stable component supply, AEC-Q100 compliance, and long-term automotive lifecycle support.
Supply support for TL391LVQDBVRQ1 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 delivering analog and embedded processing solutions, with deep expertise in automotive electronics and functional safety design.
The TL391LV-Q1 belongs to TI's automotive LV comparator family, engineered specifically for low-voltage (≤5 V) AEC-Q100-compliant applications where rail-to-rail input, POR, and ultra-low power are critical - replacing legacy TL331-Q1 and LM393-Q1 in modern vehicle ECUs.
FAQ
What is the pin configuration of TL391LVQDBVRQ1?
The TL391LVQDBVRQ1 uses a 5-pin SOT-23 package with pin 1 = IN−, pin 2 = GND, pin 3 = IN+, pin 4 = OUT, and pin 5 = VCC. This "TS391-type" pinout differs from TL331LV-Q1 by swapping IN+ and IN− positions, requiring careful schematic verification before substitution. The open-drain output on pin 4 mandates an external pull-up resistor for proper logic-level operation.
Does TL391LVQDBVRQ1 support rail-to-rail input operation?
Yes, TL391LVQDBVRQ1 supports true rail-to-rail input operation, allowing common-mode voltages from GND to VCC (and up to 6 V beyond GND without damage). This eliminates need for input scaling resistors in applications like battery voltage monitoring or sensor interface circuits operating near supply rails.
What is the purpose of the Power-On-Reset (POR) feature in TL391LVQDBVRQ1?
The POR circuit in TL391LVQDBVRQ1 forces the output into high-impedance state until VCC rises above 1.65 V, preventing false triggering during power-up or brownout conditions. This ensures deterministic startup behavior in automotive systems where uncontrolled comparator output could activate actuators or disrupt communication busses.
How does TL391LVQDBVRQ1 differ from standard LM393-Q1 comparators?
TL391LVQDBVRQ1 improves upon LM393-Q1 with lower supply voltage range (1.65–5.5 V vs. 2–36 V), rail-to-rail inputs, 400 µV offset (vs. ~2 mV), 25 µA quiescent current (vs. ~500 µA), and integrated POR. It is optimized for modern low-voltage automotive domains, whereas LM393-Q1 targets wide-supply industrial applications.
Is TL391LVQDBVRQ1 qualified for automotive use?
Yes, TL391LVQDBVRQ1 is AEC-Q100 qualified for Grade 1 (–40°C to +125°C ambient), with HBM ESD rating of ±2 kV and CDM rating of ±1 kV. It meets automotive reliability, thermal, and stress test requirements, making it suitable for engine control, ADAS, body electronics, and infotainment systems.
TL391LVQDBVRQ1 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:
- Automotive
- Grade:
- AEC-Q100
- Qualification:
- Surface Mount
- :
- SOT-23-5
TL391LVQDBVRQ1 FAQ
1.How can I place an order for TL391LVQDBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL391LVQDBVRQ1 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 TL391LVQDBVRQ1 reliable?
The price and inventory of TL391LVQDBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL391LVQDBVRQ1 is usually 5 days.
3.What payment methods are accepted for TL391LVQDBVRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL391LVQDBVRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL391LVQDBVRQ1?
TL391LVQDBVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL391LVQDBVRQ1 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 TL391LVQDBVRQ1?
For technical support, including TL391LVQDBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL391LVQDBVRQ1 requirements.
6.How does Aetrix verify that TL391LVQDBVRQ1 is sourced from the original manufacturer or authorized distributors?
All TL391LVQDBVRQ1 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 TL391LVQDBVRQ1 meets industry standards.
7.What is the process for return or replacement of TL391LVQDBVRQ1?
All TL391LVQDBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TL391LVQDBVRQ1, 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 TL391LVQDBVRQ1 part is unused and in its original packaging.
Return procedure for TL391LVQDBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL391LVQDBVRQ1 Tags
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