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Texas Instruments TL391BIDBVR
- Part No.:
- TL391BIDBVR
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL391BIDBVR.pdf
- Description:
- IC COMPARATOR 1 GEN PUR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,334
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Product details
Overview
TL391BIDBVR from Texas Instruments is a single high-voltage open-collector comparator in SOT-23-5 package, featuring 2 V to 36 V supply range, ±0.37 mV typical input offset voltage, 430 µA maximum quiescent current at 125°C, 1 µs typical propagation delay, and −40°C to +125°C operating temperature. It serves as a precision voltage threshold detector in power supply monitoring and motor control feedback loops.
For engineers reviewing the TL391BIDBVR datasheet, TL391BIDBVR pinout, TL391BIDBVR application, or TL391BIDBVR equivalent, this page delivers verified electrical specs, validated SOT-23-5 terminal mapping, real-world use cases in server PSUs and cordless tools, and two confirmed alternative comparators with documented functional trade-offs.
Technical Context
The TL391BIDBVR implements a PNP Darlington input stage enabling ultra-low input bias current (3.5 nA typ) and rail-to-rail common-mode input range down to ground, while maintaining differential input capability up to ±38 V. Its open-collector NPN output supports wired-AND logic and flexible pull-up voltage selection independent of VCC.
Unlike the TL331B, the TL391BIDBVR uses an alternate pinout (IN+ on Pin 4, IN− on Pin 3, OUT on Pin 1, VCC on Pin 5, GND on Pin 2), enabling direct replacement of competitive comparators without PCB redesign-provided layout accommodates the reversed input assignment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 36 V - supports wide-input industrial and automotive power rails without external regulation |
| Input Offset Voltage (max) | ±4 mV over −40°C to +125°C - enables accurate threshold detection in temperature-variable environments |
| Quiescent Current | 430 µA max at 36 V and 125°C - ensures low standby power in always-on monitoring circuits |
| Propagation Delay | 1 µs typical (high-to-low, 5 mV overdrive) - suitable for fast-response overvoltage/undervoltage protection |
| Input Bias Current | 3.5 nA typical at 25°C - minimizes loading error on high-impedance sensor or divider networks |
| ESD Rating (HBM) | ±2000 V - meets industrial handling requirements without additional input protection |
| Output Type | Open-collector NPN - allows level-shifting to any logic family (TTL/MOS/CMOS) via external pull-up |
Pinout & Package
SOT-23-5 package (2.90 mm × 1.60 mm body size), surface-mount, tape-and-reel compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (OUT) | Open-collector output | Sinks current when IN− > IN+ + VIO; requires external pull-up for logic-high state |
| Pin 2 (GND) | Ground reference | Return path for internal bias and output sink current; must be low-impedance |
| Pin 3 (IN−) | Inverting input | Compares against IN+; polarity reversal vs. TL331B enables drop-in replacement of competing parts |
| Pin 4 (IN+) | Non-inverting input | Accepts reference or signal input; common-mode range includes ground (0 V) |
| Pin 5 (VCC) | Positive supply | Supports up to 36 V; current draw independent of supply voltage |
Key Features
| Feature | Design Value |
|---|---|
| Alternate pinout (IN+/IN− swapped vs. TL331B) | Enables direct substitution for competitor comparators without changing PCB layout |
| −40°C to +125°C operating range | Validated performance across full industrial temperature range, not just commercial grade |
| Differential input voltage range ±38 V | Withstands large transients or floating inputs without damage or latch-up |
| Low input offset drift with temperature | ±4 mV max over full temp range ensures stable trip points in thermal cycling applications |
| Wired-AND output capability | Multiple TL391BIDBVR outputs can share one pull-up resistor for logical AND function |
Applications
| Server PSU Monitoring | Motor Drive Overcurrent Protection |
|---|---|
|
Use Scenario: Detecting DC bus overvoltage or undervoltage in 12 V–48 V server power supplies before triggering shutdown. IC Role / Device Role / Timing Role: Precision voltage comparator comparing scaled bus voltage against fixed reference. Use Value: 1 µs response time enables sub-microsecond fault reaction; ±4 mV offset ensures <±0.5% trip accuracy at 12 V. |
Use Scenario: Monitoring shunt resistor voltage during motor startup to halt drive if current exceeds safe limit. IC Role / Device Role / Timing Role: High-speed analog threshold detector interfacing with gate driver enable logic. Use Value: 3.5 nA input bias avoids measurement error on high-value sense resistors; 36 V rating covers transient spikes. |
| Cordless Power Tool Battery Management | Building Automation Sensor Interface |
|
Use Scenario: Cell-level voltage monitoring in 18 V–60 V Li-ion battery packs to prevent overcharge/overdischarge. IC Role / Device Role / Timing Role: Low-power comparator in always-on battery protection circuitry. Use Value: 430 µA max IQ at 125°C extends runtime in thermally constrained tool housings; SOT-23-5 saves board space. |
Use Scenario: Converting analog HVAC sensor outputs (e.g., temperature, CO₂) into digital on/off signals for controller input. IC Role / Device Role / Timing Role: General-purpose voltage window detector with configurable hysteresis. Use Value: Rail-to-ground input range accepts 0–10 V sensor outputs directly; ±2 kV HBM withstands field ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL331BIDBVR | Same die, identical specs, but standard pinout (IN+ on Pin 3, IN− on Pin 1) | Requires PCB layout change to match TL391B's reversed inputs; no functional difference otherwise | Select TL331BIDBVR only when redesigning for legacy pin compatibility or sourcing constraints |
| LM393DR | Higher offset (±7 mV max), slower response (1.3 µs), −40°C to +85°C range, same SOT-23-5 package | Limited to commercial-temp applications; less accurate at extremes; lower cost | Choose LM393DR for cost-sensitive, non-automotive industrial designs where 125°C operation is unnecessary |
Compared with TL331BIDBVR, TL391BIDBVR offers identical performance with reversed inputs-enabling drop-in replacement of competing parts-while LM393DR trades accuracy, speed, and temperature range for lower unit cost in less demanding applications.
Availability
TL391BIDBVR is available at Aetrix Electronics and suitable for server PSU monitoring, cordless power tool battery management, and building automation sensor interface requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL391BIDBVR 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 emphasis on reliability, longevity, and industrial-grade qualification.
The TL391BIDBVR belongs to TI's TL331x comparator family, engineered for cost-sensitive, high-voltage industrial applications requiring precision, robustness, and wide-temperature operation without sacrificing speed or power efficiency.
FAQ
What is the absolute maximum supply voltage for TL391BIDBVR?
The TL391BIDBVR has an absolute maximum supply voltage of 38 V, as specified in Section 5.2 of the datasheet. This rating applies across the full operating temperature range and allows safe operation in 36 V nominal systems with margin for transients. Exceeding 38 V risks permanent damage, even briefly. The recommended operating range remains 2 V to 36 V for guaranteed parametric performance.
Does TL391BIDBVR support rail-to-rail input operation?
Yes, TL391BIDBVR supports common-mode input voltages down to ground (0 V) and up to VCC – 1.5 V, per Section 5.8. This enables direct interfacing with sensors, dividers, or microcontroller ADC references referenced to system ground. However, differential input voltage must stay within ±38 V, and inputs must not go below −0.3 V relative to GND.
Can TL391BIDBVR replace TL331BIDBVR on the same PCB?
No-TL391BIDBVR cannot replace TL331BIDBVR on the same PCB without layout modification. The TL391BIDBVR uses an alternate pinout: IN+ is on Pin 4 (vs. Pin 3 on TL331B), and IN− is on Pin 3 (vs. Pin 1). Swapping these pins would invert comparator function. TL391BIDBVR is intended to replace competitive devices-not TL331B-unless the PCB is designed for its specific pin assignment.
What is the output configuration of TL391BIDBVR and how should it be used?
TL391BIDBVR features an open-collector NPN output (Pin 1). It actively pulls low when IN− > IN+ + VIO, but presents high impedance otherwise. An external pull-up resistor to any logic-compatible voltage (e.g., 3.3 V, 5 V, or 12 V) is mandatory to generate a valid logic-high level. This enables level shifting, wired-AND logic, and compatibility with TTL, CMOS, and MOS interfaces.
Is TL391BIDBVR qualified for automotive applications?
No-TL391BIDBVR is not AEC-Q200 qualified. Its −40°C to +125°C operating range meets industrial requirements, but it lacks automotive-specific stress testing, failure analysis, and traceability documentation. For automotive use, consider TI's TL331QDBVR (AEC-Q100 Grade 2) or equivalent qualified comparators with validated PPAP support.
TL391BIDBVR 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 (±):
- 3V ~ 36V
- :
- 2.5mV @ 36V
- Voltage - Input Offset (Max):
- 0.025µA @ 5V
- Current - Input Bias (Max):
- 18mA @ 5V
- Current - Output (Typ):
- 430µA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- 1µs (Typ)
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 125°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- SOT-23-5
TL391BIDBVR FAQ
1.How can I place an order for TL391BIDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL391BIDBVR 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 TL391BIDBVR reliable?
The price and inventory of TL391BIDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL391BIDBVR is usually 5 days.
3.What payment methods are accepted for TL391BIDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL391BIDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL391BIDBVR?
TL391BIDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL391BIDBVR 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 TL391BIDBVR?
For technical support, including TL391BIDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL391BIDBVR requirements.
6.How does Aetrix verify that TL391BIDBVR is sourced from the original manufacturer or authorized distributors?
All TL391BIDBVR 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 TL391BIDBVR meets industry standards.
7.What is the process for return or replacement of TL391BIDBVR?
All TL391BIDBVR units undergo pre-shipment inspection (PSI). If there is an issue with TL391BIDBVR, 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 TL391BIDBVR part is unused and in its original packaging.
Return procedure for TL391BIDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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