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STMicroelectronics TS391AILT
- Part No.:
- TS391AILT
- Manufacturer:
- STMicroelectronics
- Category:
- Comparators
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TS391AILT.pdf
- Description:
- IC COMPARATOR 1 GEN PUR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,595
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Product details
Overview
TS391AILT from STMicroelectronics is a low-power single-supply voltage comparator in SOT23-5 package, featuring ±2 mV max input offset voltage (TS391A grade), 25 nA typical input bias current, and rail-to-rail input common-mode range including ground. It operates from 2 V to 36 V single supply or ±1 V to ±18 V dual supply, with 0.2 mA supply current at 5 V, enabling use in battery-powered sensor threshold detection and industrial level-shifting circuits.
For engineers reviewing the TS391AILT datasheet, TS391AILT pinout, TS391AILT application, or TS391AILT equivalent, key selection considerations include input offset voltage tightness (±2 mV max), ground-sensing capability on single supply, low 250 mV typ. output saturation voltage at 4 mA, and compatibility with TTL/CMOS logic families.
Technical Context
The TS391AILT uses a PNP-input stage enabling input common-mode voltage down to ground on single supply - a critical feature for detecting near-zero reference thresholds without level-shifting circuitry. Its open-collector output supports wired-OR configurations and direct interfacing with 3.3 V or 5 V logic families.
It delivers 300 ns large-signal response time under TTL-compatible conditions (Vref = 1.4 V, RL = 5.1 kΩ) and maintains stable operation across -40 °C to +125 °C ambient temperature, with absolute maximum differential input voltage equal to supply voltage (±36 V).
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 - supports wide-input industrial and automotive power rails. |
| Input Offset Voltage (max) | ±2 mV at Tamb = 25 °C - enables accurate threshold detection within 2 mV of reference, critical for precision level sensing. |
| Input Bias Current (typ) | 25 nA - minimizes loading on high-impedance sensor sources like thermistors or photodiodes. |
| Supply Current (typ) | 0.2 mA at 5 V - allows continuous operation in ultra-low-power systems (e.g., coin-cell IoT nodes). |
| Output Saturation Voltage (typ) | 250 mV at IO = 4 mA - ensures reliable low-state logic recognition when driving 3.3 V CMOS inputs. |
| Response Time (large-signal) | 300 ns - suitable for fast edge detection in motor commutation feedback or overvoltage latch circuits. |
| Input Common-Mode Range | Includes ground (0 V) up to (VCC+ – 1.5 V) - eliminates need for external biasing in ground-referenced signal monitoring. |
Pinout & Package
SOT23-5 package: 2.9 mm × 1.3 mm × 1.0 mm body, surface-mount, moisture sensitivity level 1 (MSL1), RoHS-compliant ECOPACK2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VCC+ | Positive supply terminal | Accepts 2–36 V single supply or positive rail in dual-supply mode; powers internal PNP input stage. |
| 2: IN− | Inverting input | Differential input node; referenced against IN+ to determine output state; accepts voltages from −0.3 V to (VCC+ − 1.5 V). |
| 3: OUT | Open-collector output | Active-low sinking output; requires external pull-up to define high logic level; supports wired-OR and mixed-voltage interfacing. |
| 4: VCC− | Negative supply / ground terminal | Connected to 0 V in single-supply mode; enables true ground-referenced input operation. |
| 5: IN+ | Non-inverting input | Differential input node; defines threshold crossing point; shares same voltage range and bias current as IN−. |
Key Features
| Feature | Design Value |
|---|---|
| Ground-sensing input stage | PNP input architecture enables common-mode range down to 0 V on single supply - no external bias resistors needed for ground-referenced sensors. |
| Low quiescent power | 0.2 mA supply current at 5 V (1 mW per comparator) - extends battery life in portable instrumentation and remote monitoring nodes. |
| TTL/CMOS/DTL/ECL output compatibility | Open-collector output with 250 mV saturation voltage at 4 mA - directly interfaces with legacy and modern logic families without level shifters. |
| Wide supply flexibility | Operates from 2 V (enabling 2-cell alkaline or LiFePO4 battery use) up to 36 V (supporting 24 V industrial control rails). |
| High ESD robustness | 1500 V HBM, 1000 V CDM - improves manufacturing yield and field reliability in handling-sensitive industrial assembly environments. |
Applications
| Battery Voltage Monitor | Industrial Overvoltage Protection |
|---|---|
|
Use Scenario: Monitoring 3.7 V Li-ion cell voltage during discharge to trigger low-battery warning at 3.0 V threshold. IC Role / Device Role / Timing Role: Precision voltage comparator comparing cell voltage against 3.0 V reference; outputs active-low flag when below threshold. Use Value: ±2 mV max input offset ensures trip point accuracy within ±0.05% of 3.0 V, preventing premature shutdown or over-discharge. |
Use Scenario: Detecting >28 V on a 24 V PLC I/O line to disable downstream loads before damage occurs. IC Role / Device Role / Timing Role: High-side overvoltage detector with resistor divider input; drives latch circuit upon excursion. Use Value: 36 V absolute max supply and ±36 V differential input rating allow direct connection to 24 V rail with minimal external protection. |
| Photodiode Signal Thresholding | Motor Commutation Zero-Cross Detection |
|
Use Scenario: Converting weak analog photocurrent from ambient light sensor into digital ON/OFF signal at 10 lux threshold. IC Role / Device Role / Timing Role: Low-noise comparator amplifying transimpedance amplifier output; rejects dark-current drift via matched PNP inputs. Use Value: 25 nA typical input bias current avoids loading high-impedance TIA output, preserving signal integrity and dynamic range. |
Use Scenario: Detecting back-EMF zero-crossing in BLDC motor phase windings to synchronize commutation timing. IC Role / Device Role / Timing Role: Fast-response comparator sampling winding voltage relative to midpoint reference; triggers gate driver timing. Use Value: 300 ns large-signal response time ensures <1° electrical angle timing error at 10 krpm, maintaining torque smoothness and efficiency. |
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 (±2.5 mV typ.), higher supply current (0.8 mA), no guaranteed ground-sensing on single supply. | Less accurate thresholding in low-voltage battery monitoring; may require input biasing network. | Choose LM393DR only if cost is primary constraint and ±2.5 mV offset is acceptable. |
| TLV3701IDBVR | Lower supply current (1 µA), rail-to-rail output, but limited 5.5 V max supply; no 36 V rating. | Not suitable for 24 V industrial or automotive supply rails; requires level-shifting for high-side sensing. | Choose TLV3701IDBVR only for sub-5 V battery-powered designs where nanoamp quiescent current is mandatory. |
Compared with LM393DR and TLV3701IDBVR, TS391AILT uniquely balances 36 V operation, ground-sensing capability, ±2 mV offset, and 0.2 mA supply current - making it optimal for industrial and automotive threshold detection where supply voltage headroom and precision coexist.
Availability
TS391AILT is available at Aetrix Electronics and suitable for battery management systems, industrial safety interlocks, photodetection modules, and motor control feedback circuits requiring stable component supply across extended temperature and voltage ranges.
Supply support for TS391AILT 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 management ICs, sensors, and analog components for industrial, automotive, and consumer markets.
The TS391 series belongs to ST's precision analog comparators product line, engineered specifically for robust, low-power threshold detection in harsh environments - emphasizing ground-sensing capability, wide supply tolerance, and high ESD immunity.
FAQ
Can TS391AILT operate with VCC− left unconnected in single-supply mode?
No. In single-supply configuration, Pin 4 (VCC−) must be connected to system ground. Leaving it floating violates absolute maximum ratings and risks undefined output behavior or device damage due to internal node biasing failure.
Does TS391AILT support push-pull output configuration?
No. TS391AILT features an open-collector output only. A pull-up resistor is required to establish the high logic level. Internal push-pull topology is not implemented; attempting to drive the output high without external pull-up results in indeterminate voltage.
What is the maximum allowable input voltage when VCC+ = 5 V?
Either input (IN+ or IN−) may safely reach up to 30 V regardless of VCC+, provided the other input remains within the common-mode range (0 V to VCC+ − 1.5 V). This allows overvoltage-tolerant sensing in mixed-rail systems.
Is TS391AILT qualified for automotive applications?
No. TS391AILT is rated for industrial temperature range (−40 °C to +125 °C) but lacks AEC-Q100 qualification. For automotive use, ST offers TS391IYLT (AEC-Q100 Grade 2) in the same SOT23-5 package with identical electrical specs and enhanced screening.
TS391AILT 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
TS391AILT FAQ
1.How can I place an order for TS391AILT through Aetrix?
Please submit a Request for Quotation (RFQ) for TS391AILT 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 TS391AILT reliable?
The price and inventory of TS391AILT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS391AILT is usually 5 days.
3.What payment methods are accepted for TS391AILT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS391AILT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS391AILT?
TS391AILT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS391AILT 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 TS391AILT?
For technical support, including TS391AILT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS391AILT requirements.
6.How does Aetrix verify that TS391AILT is sourced from the original manufacturer or authorized distributors?
All TS391AILT 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 TS391AILT meets industry standards.
7.What is the process for return or replacement of TS391AILT?
All TS391AILT units undergo pre-shipment inspection (PSI). If there is an issue with TS391AILT, 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 TS391AILT part is unused and in its original packaging.
Return procedure for TS391AILT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TS391AILT Tags
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