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Texas Instruments TL391BQDBVRQ1
- Part No.:
- TL391BQDBVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL391BQDBVRQ1.pdf
- Description:
- IC COMPARATOR 1 GEN PUR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:18,842
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Product details
Overview
TL391BQDBVRQ1 from Texas Instruments is an automotive-grade single-voltage comparator in SOT-23-5 package, designed for single-supply operation from 2 V to 36 V. It features 0.37 mV typical input offset voltage, 3.5 nA typical input bias current, 0.43 mA typical supply current, and 1 µs typical propagation delay. It serves as a precision level-shifting or threshold-detection element in high-voltage automotive sensor interfaces and power monitoring circuits.
For engineers reviewing the TL391BQDBVRQ1 datasheet, TL391BQDBVRQ1 pinout, TL391BQDBVRQ1 application, or TL391BQDBVRQ1 equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive operating range (–40°C to +125°C), AEC-Q100 Grade 1 qualification, and real-world comparator selection guidance - all grounded in TI's SLVS969H production data sheet.
Technical Context
The TL391BQDBVRQ1 implements a PNP Darlington-pair input stage enabling ultra-low input bias current and rail-to-rail common-mode input range down to ground. Its open-collector NPN output supports wired-AND logic and flexible pull-up configuration across TTL, MOS, and CMOS voltage domains.
It operates with differential input voltage tolerance up to ±38 V and maintains stable performance over full AEC-Q100 Grade 1 temperature range (–40°C to +125°C). Dedicated ESD protection cells provide ±2000 V HBM and ±750 V CDM robustness, with improved negative input voltage handling beyond legacy TL331-Q1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 36 V - supports direct connection to 12 V/24 V automotive batteries and industrial rails without regulation. |
| Input Offset Voltage (max) | ±4 mV over –40°C to +125°C - enables accurate threshold detection in battery voltage monitoring and motor overcurrent sensing. |
| Propagation Delay (typ) | 1 µs at 5 V supply - ensures fast response for overvoltage lockout and fault flag generation in powertrain control units. |
| Input Bias Current (typ) | 3.5 nA at 25°C - minimizes loading on high-impedance sensor sources such as thermistors and potentiometers. |
| Quiescent Current (typ) | 330 µA at 5 V - allows continuous operation in always-on vehicle modules without excessive standby power draw. |
| Differential Input Voltage Range | ±38 V - permits safe operation with inputs exceeding supply voltage, critical for battery cell monitoring and reverse-polarity protection circuits. |
| ESD Rating (HBM) | ±2000 V - meets AEC-Q100 stress requirements for automotive assembly and field environments. |
Pinout & Package
SOT-23-5 package (2.90 mm × 1.60 mm), surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Positive Input | Non-inverting input terminal; accepts signals from 0 V to VCC – 2 V across full temperature range. |
| VCC | Power Supply Input | Primary supply pin; supports 2 V to 36 V operation with absolute max rating of 38 V. |
| IN− | Negative Input | Inverting input terminal; differential input range extends to ±38 V relative to IN+. |
| OUT | Open-Collector Output | NPN output transistor collector; requires external pull-up to define logic-high level and sink up to 20 mA. |
| GND | Ground Reference | Return path for supply and input common-mode; input range includes ground (0 V). |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 Qualified | Validated for –40°C to +125°C ambient operation - suitable for engine bay and powertrain applications without derating. |
| Wide Common-Mode Input Range | Extends from ground to VCC – 2.0 V - enables direct sensing of low-side shunt voltages and battery stack monitoring. |
| Open-Collector Output | Supports mixed-voltage interfacing (e.g., 3.3 V MCU with 12 V pull-up) and wired-AND bus configurations. |
| Low Input Bias Current | 3.5 nA typ at 25°C - preserves signal integrity when driving from high-impedance sources like thermistors or photodiodes. |
| Fast Propagation Delay | 1 µs typ at 5 V - meets timing requirements for real-time fault detection in EV battery management systems. |
Applications
| Body Control Module (BCM) | EV Battery Cell Monitoring |
|---|---|
Use Scenario: Detect door-open status via magnetic reed switch closure against a fixed reference voltage. IC Role / Device Role / Timing Role: Single comparator comparing reed switch voltage to 2.5 V reference; open-collector output drives BCM microcontroller interrupt line. Use Value: Low 330 µA quiescent current extends vehicle sleep-mode battery life; rail-to-ground input range eliminates need for level-shifting circuitry. |
Use Scenario: Monitor individual Li-ion cell voltage against upper/lower thresholds in a 96-cell pack using resistor-divider networks. IC Role / Device Role / Timing Role: Precision threshold detector with ±4 mV offset error ensuring <±10 mV total window accuracy per cell. Use Value: ±38 V differential input range tolerates common-mode shifts up to ±30 V during pack transients, preventing false trips. |
| Infotainment Power Sequencing | HEV Inverter Overtemperature Protection |
Use Scenario: Enable display backlight only after main 5 V rail reaches regulation, using resistor divider feedback. IC Role / Device Role / Timing Role: Voltage window comparator (via dual TL391BQDBVRQ1) verifying 4.75–5.25 V range before asserting enable signal. Use Value: 1 µs propagation delay ensures rapid power-up sequencing; 2 V minimum supply allows operation during brown-out recovery. |
Use Scenario: Trigger shutdown when IGBT heatsink temperature exceeds 110°C, sensed via NTC thermistor voltage divider. IC Role / Device Role / Timing Role: High-precision comparator detecting thermistor voltage crossing 1.82 V threshold at 110°C. Use Value: 3.5 nA input bias current prevents thermistor self-heating error; AEC-Q100 Grade 1 rating guarantees reliability under under-hood thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar single-comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL331BQDBVRQ1 | Same silicon, identical electrical specs, but reversed IN+/IN− pinout (IN+ on Pin 3, IN− on Pin 1). | Requires PCB layout change; not pin-compatible - used where legacy TL331-Q1 footprint compatibility is needed. | Select TL331BQDBVRQ1 only if replacing existing TL331-Q1 designs or interfacing with competing comparators using standard pinout. |
| LM393QPWRQ1 | Higher offset voltage (±7 mV max), slower response (1.3 µs), higher supply current (0.7 mA typ), same SOT-23-5 package. | Lower precision and speed; suitable for non-critical voltage monitoring where cost is primary constraint. | Choose LM393QPWRQ1 only for cost-sensitive body electronics where ±7 mV offset and 1.3 µs delay are acceptable. |
Compared with TL391BQDBVRQ1, TL331BQDBVRQ1 offers identical performance but demands board revision due to pinout reversal, while LM393QPWRQ1 trades precision and speed for lower unit cost - making TL391BQDBVRQ1 optimal for high-accuracy, fast-response automotive sensing where pinout flexibility is available.
Availability
TL391BQDBVRQ1 is available at Aetrix Electronics and suitable for automotive body control modules, EV battery management systems, infotainment power sequencing, and HEV inverter thermal protection requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL391BQDBVRQ1 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, embedded processing, and connectivity solutions with deep automotive qualification expertise and AEC-Q100 process rigor.
The TL391B-Q1 product line was engineered specifically for next-generation automotive voltage comparison tasks - emphasizing lower offset, faster response, and enhanced ESD robustness over legacy comparators in safety-critical powertrain and chassis systems.
FAQ
What is the maximum supply voltage rating for TL391BQDBVRQ1?
The absolute maximum supply voltage for TL391BQDBVRQ1 is 38 V, with recommended operation from 2 V to 36 V. This rating allows direct connection to 24 V truck battery systems and transient-tolerant operation in automotive environments where load-dump spikes occur. The device maintains functional stability across its full rated range, as confirmed in Section 5.2 of TI's SLVS969H datasheet. TL391BQDBVRQ1 retains specification compliance up to 36 V under all operating conditions.
Does TL391BQDBVRQ1 support operation with inputs below ground?
TL391BQDBVRQ1 does not support sustained input voltages below ground; its absolute minimum input voltage is –0.3 V per Section 5.2 of the datasheet. However, it tolerates brief negative excursions (e.g., ESD events) due to integrated protection diodes. For applications requiring true negative input capability, external clamping or level-shifting is required. TL391BQDBVRQ1's input range is explicitly specified from ground (0 V) to VCC – 2.0 V across –40°C to +125°C.
Is TL391BQDBVRQ1 pin-compatible with TL331-Q1?
No, TL391BQDBVRQ1 is not pin-compatible with TL331-Q1. While both use SOT-23-5 packaging, TL391BQDBVRQ1 uses an alternate pinout: IN+ on Pin 4, IN− on Pin 3, OUT on Pin 1, VCC on Pin 5, and GND on Pin 2. TL331-Q1 places IN+ on Pin 3 and IN− on Pin 2. This difference is documented in Figures 4-1 and 4-2 of SLVS969H. TL391BQDBVRQ1 is intended as a functional upgrade with layout adaptation, not a drop-in replacement.
What is the guaranteed input offset voltage specification for TL391BQDBVRQ1 over temperature?
The guaranteed maximum input offset voltage for TL391BQDBVRQ1 is ±4 mV across the full AEC-Q100 Grade 1 operating temperature range of –40°C to +125°C, as specified in Table 5-7 of the SLVS969H datasheet. This value is measured under defined test conditions (VS = 5 V to 36 V) and represents worst-case deviation - critical for precision threshold detection in battery cell balancing and motor phase current monitoring where cumulative error must remain under ±10 mV.
Can TL391BQDBVRQ1 drive a 5 V logic input directly?
Yes, TL391BQDBVRQ1 can drive a 5 V logic input directly when configured with a 5 V pull-up resistor on the open-collector OUT pin. Its output sinks up to 20 mA and achieves ≤400 mV low-level voltage at 4 mA sink current (Section 5.7), satisfying TTL and CMOS logic-low thresholds. No level-shifter is needed - the device's wide supply range and rail-compatible inputs make it ideal for interfacing between 12 V sensors and 3.3 V/5 V MCUs in automotive domains. TL391BQDBVRQ1's design inherently supports this mixed-voltage operation.
TL391BQDBVRQ1 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-Collector, Rail-to-Rail
- Voltage - Supply, Single/Dual (±):
- 2V ~ 36V
- :
- 2.5mV @ 36V
- Voltage - Input Offset (Max):
- 0.025µA @ 5V
- Current - Input Bias (Max):
- 20mA
- Current - Output (Typ):
- 430µA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 125°C (TJ)
- Operating Temperature:
- Automotive
- Grade:
- AEC-Q100
- Qualification:
- Surface Mount
- :
- SOT-23-5
TL391BQDBVRQ1 FAQ
1.How can I place an order for TL391BQDBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL391BQDBVRQ1 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 TL391BQDBVRQ1 reliable?
The price and inventory of TL391BQDBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL391BQDBVRQ1 is usually 5 days.
3.What payment methods are accepted for TL391BQDBVRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL391BQDBVRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL391BQDBVRQ1?
TL391BQDBVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL391BQDBVRQ1 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 TL391BQDBVRQ1?
For technical support, including TL391BQDBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL391BQDBVRQ1 requirements.
6.How does Aetrix verify that TL391BQDBVRQ1 is sourced from the original manufacturer or authorized distributors?
All TL391BQDBVRQ1 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 TL391BQDBVRQ1 meets industry standards.
7.What is the process for return or replacement of TL391BQDBVRQ1?
All TL391BQDBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TL391BQDBVRQ1, 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 TL391BQDBVRQ1 part is unused and in its original packaging.
Return procedure for TL391BQDBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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