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STMicroelectronics TS391RILT
- Part No.:
- TS391RILT
- Manufacturer:
- STMicroelectronics
- Category:
- Comparators
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TS391RILT.pdf
- Description:
- IC COMPARATOR 1 GEN PUR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:68,997
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Product details
Overview
TS391RILT from STMicroelectronics is a low-power single-supply voltage comparator in SOT23-5 package, featuring rail-to-rail input common-mode range including ground, ±2 mV max input offset voltage (TS391A grade), 0.2 mA supply current at 5 V, and TTL/CMOS-compatible open-collector output. It operates from 2 V to 36 V single supply or ±1 V to ±18 V dual supply, enabling use in battery-powered sensor threshold detection and industrial voltage monitoring circuits.
For engineers reviewing the TS391RILT datasheet, TS391RILT pinout, TS391RILT application, or TS391RILT equivalent, key selection criteria include input offset voltage stability over temperature, ground-sensing capability under single supply, low quiescent current for energy-constrained systems, and compatibility with legacy logic families without level-shifting.
Technical Context
The TS391RILT uses a PNP-input stage enabling input common-mode voltage down to ground (0 V) even with single 2–36 V supply - critical for direct sensing of grounded reference signals. Its open-collector output supports wired-OR configuration and flexible pull-up voltage selection up to 36 V independent of VCC.
It delivers 300 ns large-signal response time (TTL input, 1.4 V reference) and 1.3 µs small-signal response (100 mV step, 5 mV overdrive), with differential input voltage range equal to full supply voltage (±36 V), allowing robust operation under mismatched input conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage range | 2 V to 36 V single supply or ±1 V to ±18 V dual supply - enables direct integration into 3.3 V, 5 V, 12 V, and 24 V systems without regulators. |
| Input offset voltage (max) | ±2 mV (TS391A grade) - ensures accurate threshold detection at low signal levels, e.g., <10 mV sensor outputs. |
| Supply current (typ) | 0.2 mA at 5 V - supports >10-year battery life in coin-cell-powered IoT wake-up comparators. |
| Input bias current (typ) | 25 nA - minimizes loading error on high-impedance sources like thermistors or photodiodes. |
| Response time (large-signal) | 300 ns - suitable for fast overvoltage/undervoltage protection in DC-DC converters and motor drives. |
| Output saturation voltage | 250 mV typ. at 4 mA sink - reduces power loss and heat generation in high-duty-cycle switching applications. |
| ESD rating (HBM) | 1500 V - meets IEC 61000-4-2 Level 2 for industrial board-level robustness. |
Pinout & Package
SOT23-5 package: 2.9 mm × 2.8 mm × 1.3 mm body, surface-mount, lead-free ECOPACK® compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VCC+ | Positive supply terminal | Accepts 2–36 V single supply or +V rail in dual supply; powers internal circuitry and defines output high-voltage ceiling via external pull-up. |
| 2: IN− | Inverting input | Differential input node; referenced to ground or adjustable threshold; supports common-mode range from 0 V to (VCC+ − 1.5 V). |
| 3: OUT | Open-collector output | Sinks up to 16 mA; requires external pull-up resistor; output voltage swings up to 36 V regardless of VCC+ value. |
| 4: VCC− | Negative supply / ground terminal | Connected to 0 V in single-supply mode; enables true ground-referenced input operation without level shifters. |
| 5: IN+ | Non-inverting input | Differential input node; accepts signals down to 0 V; same common-mode range as IN−, enabling bidirectional zero-crossing detection. |
Key Features
| Feature | Design Value |
|---|---|
| Ground-sensing input stage | Input common-mode range includes 0 V on both inputs under single supply - eliminates need for negative rail or bias resistors in sensor interface designs. |
| Wide supply flexibility | Operates from 2 V (Li-ion cutoff) to 36 V (industrial bus) - one BOM item covers portable, automotive, and factory automation applications. |
| Low-power precision | 0.2 mA supply current with ±2 mV offset - achieves microamp-level system sleep current while retaining sub-mV accuracy for wake-up triggers. |
| Robust output drive | 16 mA sink capability with 250 mV saturation voltage - directly drives LEDs, MOSFET gates, or optocouplers without buffer stages. |
| High ESD tolerance | 1500 V HBM - withstands handling and board assembly without special precautions, reducing test yield loss. |
Applications
| Battery Voltage Monitor | Overvoltage Protection Circuit |
|---|---|
|
Use Scenario: Monitoring Li-ion cell voltage during charging/discharging to trigger cutoff at 4.2 V or 2.8 V thresholds. IC Role / Device Role / Timing Role: Precision comparator comparing cell voltage against stable reference; provides clean digital flag for MCU or analog shutdown path. Use Value: 0.2 mA quiescent current extends battery shelf life; ±2 mV offset ensures ≤5 mV total error in 4.2 V cutoff, preventing overcharge damage. |
Use Scenario: Detecting >30 V surge on 24 V industrial PLC input to disable downstream power stage before damage occurs. IC Role / Device Role / Timing Role: Fast-response comparator with 300 ns propagation delay, driving latch or gate driver to interrupt power path. Use Value: 36 V absolute max output voltage allows direct connection to 30 V rail; 250 mV output saturation ensures reliable MOSFET turn-on under load. |
| Zero-Crossing Detector | Thermistor-Based Temperature Switch |
|
Use Scenario: Converting AC line voltage to synchronized square wave for TRIAC phase control in smart lighting dimmers. IC Role / Device Role / Timing Role: Ground-referenced comparator detecting polarity reversal of transformer-coupled AC signal. Use Value: Input common-mode range including ground enables direct connection to center-tapped transformer secondary without bias network. |
Use Scenario: Activating cooling fan when NTC thermistor voltage crosses 1.25 V threshold in embedded motor controller. IC Role / Device Role / Timing Role: Low-drift comparator interfacing high-impedance thermistor divider; output drives fan enable line. Use Value: 25 nA input bias current prevents significant voltage drop across 100 kΩ thermistor leg, preserving measurement accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-power single-supply comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM393DR | Higher input offset voltage (±7 mV max), no guaranteed ground-sensing capability below 1.5 V above V−, 0.8 mA supply current. | Limited to higher-threshold detection (>50 mV) and non-ground-referenced inputs; less suitable for Li-ion cutoff or zero-crossing. | Select when cost is primary constraint and ground-sensing or ultra-low IQ are not required. |
| TLV3701IDBVR | Lower supply current (1 µA), rail-to-rail input/output, but only rated to 16 V supply and lacks 36 V output swing capability. | Not usable in 24 V/36 V industrial bus monitoring; open-drain output cannot pull up beyond VCC. | Select for ultra-low-power battery sensors below 16 V where output voltage headroom is not needed. |
Compared with LM393DR and TLV3701IDBVR, TS391RILT uniquely combines ground-sensing operation, 36 V output voltage support, and sub-0.5 mA supply current - making it optimal for wide-input industrial monitors and battery-critical safety functions where both precision and voltage range matter.
Availability
TS391RILT is available at Aetrix Electronics and suitable for battery management systems, industrial overvoltage protection, AC zero-crossing detection, and thermistor-based temperature control requiring stable component supply across automotive-grade and extended-temperature production runs.
Supply support for TS391RILT 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and analog components for industrial, automotive, and consumer markets.
TS391RILT belongs to ST's precision analog comparator product line, engineered for reliability in harsh environments and designed specifically to simplify ground-referenced sensing in single-supply systems without external bias networks.
FAQ
Can TS391RILT operate with input voltages exceeding the positive supply rail?
Yes - its differential input voltage range equals the supply voltage (±36 V), and either input can safely reach up to 30 V even if VCC+ is lower, provided the other input remains within the common-mode range (0 V to VCC+ − 1.5 V). This enables direct high-side sensing without attenuators.
What is the maximum output sink current and corresponding saturation voltage?
The TS391RILT sinks up to 16 mA with a typical saturation voltage of 250 mV at 4 mA and 25 °C. At 16 mA, VOL rises to approximately 400 mV (max 700 mV over temperature), sufficient to drive standard LED indicators or MOSFET gates with minimal voltage drop.
Does TS391RILT require a dual supply to achieve ground-referenced input operation?
No - its PNP input stage allows the input common-mode voltage range to include ground (0 V) when powered from a single 2–36 V supply. This eliminates the need for negative rails or level-shifting resistors in sensor interfaces tied to earth-referenced signals.
How does the TS391RILT's 300 ns response time compare to standard comparators in overvoltage protection?
At 300 ns large-signal response (TTL input, 1.4 V reference), TS391RILT reacts faster than LM393 (1.3 µs) and matches performance of dedicated protection comparators like MAX9021, enabling timely shutdown before transient overvoltage damages downstream FETs or regulators.
TS391RILT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 1
- Output Type:
- CMOS, DTL, ECL, MOS, TTL
- Voltage - Supply, Single/Dual (±):
- 2V ~ 36V, ±1V ~ 18V
- :
- 5mV @ 30V
- Voltage - Input Offset (Max):
- 0.25µA @ 5V
- Current - Input Bias (Max):
- 16mA @ 5V
- Current - Output (Typ):
- 1.25mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 125°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- SOT-23-5
TS391RILT FAQ
1.How can I place an order for TS391RILT through Aetrix?
Please submit a Request for Quotation (RFQ) for TS391RILT 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 TS391RILT reliable?
The price and inventory of TS391RILT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS391RILT is usually 5 days.
3.What payment methods are accepted for TS391RILT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS391RILT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS391RILT?
TS391RILT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS391RILT 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 TS391RILT?
For technical support, including TS391RILT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS391RILT requirements.
6.How does Aetrix verify that TS391RILT is sourced from the original manufacturer or authorized distributors?
All TS391RILT 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 TS391RILT meets industry standards.
7.What is the process for return or replacement of TS391RILT?
All TS391RILT units undergo pre-shipment inspection (PSI). If there is an issue with TS391RILT, 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 TS391RILT part is unused and in its original packaging.
Return procedure for TS391RILT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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