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STMicroelectronics TS391ILT
- Part No.:
- TS391ILT
- Manufacturer:
- STMicroelectronics
- Category:
- Comparators
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TS391ILT.pdf
- Description:
- IC COMPARATOR 1 GEN PUR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:37,192
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Product details
Overview
TS391ILT 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 variant), 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, and is used in battery-powered sensor threshold detection, power supply monitoring, and overvoltage protection circuits.
For engineers reviewing the TS391ILT datasheet, TS391ILT pinout, TS391ILT application, or TS391ILT 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 TS391ILT uses a PNP-input stage enabling input common-mode voltage down to ground on single supply-critical for direct sensing of 0 V referenced signals like battery discharge thresholds or current-sense amplifier outputs. Its open-collector output supports wired-OR configurations and flexible pull-up voltage selection up to 36 V independent of VCC.
It delivers 300 ns large-signal response time with TTL-level inputs and maintains <250 mV output saturation voltage at 4 mA sink current. Input bias current remains stable at 25 nA typ., minimizing loading on high-impedance reference or sensor nodes.
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 industrial/battery systems without regulation. |
| Input Offset Voltage | ±2 mV max (TS391A grade) - ensures accurate threshold detection within ±2 mV error at room temperature, critical for precision window comparators. |
| Supply Current | 0.2 mA typ. at 5 V - supports >10-year operation on coin-cell batteries in always-on monitoring applications. |
| Input Bias Current | 25 nA typ. - avoids significant voltage drop across >100 kΩ source impedances, preserving signal integrity in high-Z sensor interfaces. |
| Output Sink Current | 6 mA min. at Vo = 1.5 V - drives standard LED indicators, small relays, or logic inputs directly without external buffer. |
| Response Time | 300 ns large-signal (TTL input) - suitable for fast edge detection in motor commutation feedback or pulse-width monitoring. |
| Common-Mode Range | 0 V to (VCC+ − 1.5 V) - allows direct comparison of ground-referenced signals (e.g., shunt voltage) without negative supply or level shifters. |
Pinout & Package
SOT23-5 package: 2.9 mm × 2.8 mm × 1.3 mm body, surface-mount, moisture-sensitive level 1 (MSL1), RoHS-compliant ECOPACK®.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VCC+ | Positive supply input | Accepts 2–36 V single supply or positive rail in dual-supply mode; powers internal circuitry and defines output high-voltage ceiling. |
| 2: IN− | Inverting input | Differential input node; accepts voltages from −0.3 V to (VCC+ − 1.5 V); PNP input stage enables ground-referenced operation. |
| 3: OUT | Open-collector output | Sinks current only; requires external pull-up to define logic-high level (up to 36 V); supports wired-OR and mixed-voltage interfacing. |
| 4: VCC− | Negative supply / ground | Reference return path; tied to 0 V in single-supply use; enables true ground-sensing capability when VCC− = GND. |
| 5: IN+ | Non-inverting input | Differential input node; same voltage range as IN−; used for threshold reference or signal input in high-side sensing configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Ground-sensing input stage | PNP differential pair enables common-mode input down to 0 V on single supply - eliminates need for negative rail in battery-monitoring circuits. |
| Wide supply flexibility | Operates from 2 V to 36 V single supply - supports direct connection to Li-ion, 12 V automotive, and 24 V industrial rails without LDO pre-regulation. |
| Low-power open-collector output | 0.2 mA ICC at 5 V with 6 mA sink capability - balances ultra-low standby consumption with sufficient drive strength for indicator LEDs and logic inputs. |
| Robust ESD tolerance | 1500 V HBM, 1000 V CDM - meets IEC 61000-4-2 Level 3 requirements for industrial control panel interfaces. |
| Temperature-stable performance | −40 °C to +125 °C operating range with specified Vio drift ≤2 mV over full range - suitable for under-hood automotive and outdoor equipment. |
Applications
| Battery Voltage Monitor | Power Supply Sequencing |
|---|---|
|
Use Scenario: Detecting end-of-discharge in 3.7 V Li-ion cells using a resistive divider referenced to system ground. IC Role / Device Role / Timing Role: Comparator compares divided cell voltage against 2.8 V reference; triggers shutdown when below threshold. Use Value: Ground-referenced input eliminates need for negative supply or level shifter, reducing BOM count and PCB area by 30% vs. op-amp-based solutions. |
Use Scenario: Enabling downstream DC-DC converters only after primary 12 V rail reaches regulation. IC Role / Device Role / Timing Role: Compares 12 V rail (via resistor divider) to 1.25 V reference; asserts enable signal via open-collector pull-down. Use Value: 300 ns response ensures sequencing delay <1 µs, preventing brown-out during multi-rail startup in FPGA power systems. |
| Overvoltage Protection | Zero-Crossing Detection |
|
Use Scenario: Shutting off MOSFET gate drive when 24 V industrial bus exceeds 27 V. IC Role / Device Role / Timing Role: High-side sensing via resistive divider; output sinks gate driver enable line to disable FET. Use Value: 36 V absolute max output voltage rating allows direct interface to 24 V logic without clamping diodes or Zener regulators. |
Use Scenario: Converting AC line voltage (120 V RMS) to clean digital zero-cross pulses for TRIAC phase control. IC Role / Device Role / Timing Role: Compares scaled AC waveform to ground; open-collector output pulls up to 5 V MCU input with precise edge timing. Use Value: Input common-mode range including ground enables direct AC coupling through capacitor without DC bias network, simplifying analog front-end design. |
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 |
|---|---|---|---|
| LM393DT | Higher input offset voltage (±2.5 mV max), 0.4 mA supply current, no guaranteed ground-sensing below 0.3 V. | Limited to non-critical threshold detection where ±2.5 mV error and 0.3 V input floor are acceptable. | Select when cost sensitivity outweighs precision and ground-sensing requirement; not recommended for Li-ion cutoff or shunt-based current sense. |
| TLV3701IDBVR | Lower supply current (1.3 µA), rail-to-rail output, but only 5.5 V max supply; no 36 V output tolerance. | Suitable for ultra-low-power 3.3 V systems, but cannot interface directly to 24 V buses or drive high-voltage logic. | Choose for battery life-critical IoT sensors with 3.3 V domains; avoid where 12/24 V compatibility or high-side switching is needed. |
Compared with LM393DT and TLV3701IDBVR, TS391ILT uniquely combines ground-sensing capability, 36 V output tolerance, and sub-0.5 mA quiescent current - making it optimal for industrial power monitoring where supply voltage varies widely and precision at 0 V reference is mandatory.
Availability
TS391ILT is available at Aetrix Electronics and suitable for battery management systems, industrial power sequencers, overvoltage protection modules, and AC zero-crossing detectors requiring stable component supply across automotive, industrial, and medical device programs.
Supply support for TS391ILT 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, analog ICs, power management devices, and MEMS sensors 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-referenced operation, wide supply range, and industrial temperature resilience.
FAQ
Can TS391ILT operate with VCC− floating or unconnected?
No. Pin 4 (VCC−) must be connected to system ground in single-supply operation or to the negative rail in dual-supply mode. Leaving it floating violates absolute maximum ratings and causes undefined output behavior, input stage latch-up, or permanent damage due to internal bias path disruption.
What is the maximum allowable pull-up voltage on the OUT pin?
The OUT pin supports up to 36 V pull-up voltage regardless of VCC+ level, per absolute maximum rating Vo = 36 V. This enables direct interfacing with 24 V PLC inputs or 30 V relay drivers without external level-shifting components, provided sink current remains within 20 mA limit.
Does TS391ILT support AC-coupled inputs without DC bias networks?
Yes - its input common-mode range includes ground and tolerates −0.3 V minimum, allowing direct AC coupling via series capacitor with no bias resistor network. This is validated in Figure 2 of DS1551 Rev 11 for zero-crossing detection, reducing component count and eliminating bias-induced offset errors.
How does input offset voltage change over temperature for TS391ILT?
For TS391A-grade devices (marked K512), input offset voltage is ±2 mV max at 25 °C and ±9 mV max over −40 °C to +125 °C, as specified in Table 3 of DS1551 Rev 11. This 4.5× drift is typical for bipolar-input comparators and must be accounted for in high-accuracy threshold designs.
TS391ILT 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, Open-Collector, TTL
- Voltage - Supply, Single/Dual (±):
- 2V ~ 36V, ±1V ~ 18V
- :
- 5mV @ 5V
- 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
TS391ILT FAQ
1.How can I place an order for TS391ILT through Aetrix?
Please submit a Request for Quotation (RFQ) for TS391ILT 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 TS391ILT reliable?
The price and inventory of TS391ILT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS391ILT is usually 5 days.
3.What payment methods are accepted for TS391ILT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS391ILT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS391ILT?
TS391ILT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS391ILT 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 TS391ILT?
For technical support, including TS391ILT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS391ILT requirements.
6.How does Aetrix verify that TS391ILT is sourced from the original manufacturer or authorized distributors?
All TS391ILT 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 TS391ILT meets industry standards.
7.What is the process for return or replacement of TS391ILT?
All TS391ILT units undergo pre-shipment inspection (PSI). If there is an issue with TS391ILT, 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 TS391ILT part is unused and in its original packaging.
Return procedure for TS391ILT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TS391ILT Tags
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