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STMicroelectronics TS391RIYLT
- Part No.:
- TS391RIYLT
- Manufacturer:
- STMicroelectronics
- Category:
- Comparators
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TS391RIYLT.pdf
- Description:
- IC COMPARATOR 1 GEN PUR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,961
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Product details
Overview
TS391RIYLT from STMicroelectronics is an automotive-grade low-power single-supply voltage comparator in SOT23-5 package, featuring ±2 mV max input offset voltage (TS391A grade), 0.2 mA supply current at 5 V, 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 and drives TTL/CMOS loads in battery-monitoring circuits.
For engineers reviewing the TS391RIYLT datasheet, TS391RIYLT pinout, TS391RIYLT application, or TS391RIYLT equivalent, this device is selected for precision threshold detection in automotive power management, industrial sensor interfaces, and low-quiescent-current supervisory systems where ground-sensing capability and AEC-Q100 qualification are mandatory.
Technical Context
The TS391RIYLT uses a PNP-input stage enabling input common-mode voltage down to ground on single supply - a key differentiator versus standard comparators requiring positive input headroom. Its open-collector output supports wired-OR configurations and level-shifting across voltage domains up to 36 V, independent of VCC.
It delivers 300 ns large-signal response time with 1.4 V reference compatibility and maintains stable operation over −40 °C to +125 °C ambient, meeting automotive temperature requirements without derating. Input differential voltage range equals full supply rail (±36 V), allowing overvoltage-tolerant sensing.
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 12 V/24 V automotive systems and wide-input industrial rails. |
| Input Offset Voltage (max) | ±2 mV (TS391A grade) - ensures accurate 10 mV-level threshold detection without calibration in battery voltage monitoring. |
| Supply Current (typ) | 0.2 mA at 5 V - reduces system standby power by >5× vs. legacy comparators, critical for always-on vehicle modules. |
| Input Bias Current (typ) | 25 nA - minimizes loading error on high-impedance sensor dividers (e.g., thermistor or potentiometer interfaces). |
| Response Time (large-signal) | 300 ns - supports fast overvoltage/undervoltage fault response in DC-DC converter supervision. |
| Output Sink Current | 6 mA min at Vo = 1.5 V - directly drives LEDs, small relays, or logic inputs without external amplification. |
| Common-Mode Input Range | 0 V to (VCC+ − 1.5 V) - allows ground-referenced input signals even on single 5 V or 12 V rails, eliminating level-shifters. |
Pinout & Package
SOT23-5 package: 2.9 mm × 1.6 mm × 1.1 mm body, surface-mount, lead-free ECOPACK2-compliant, qualified per AEC-Q100 Grade 1 (−40 °C to +125 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VCC+ | Positive supply input | Accepts 2–36 V single supply or connects to +V rail in dual-supply mode; powers internal circuitry and defines output high-level reference. |
| 2: IN− | Inverting input | Differential input node; accepts signals within 0 V to (VCC+ − 1.5 V); PNP input stage enables ground-sensing capability. |
| 3: OUT | Open-collector output | Active-low sinking output; requires external pull-up to any voltage ≤36 V - enables level translation and wired-OR bus interfacing. |
| 4: VCC− | Negative supply / ground reference | Connects to system ground in single-supply mode; serves as return path for input stage and output sink current. |
| 5: IN+ | Non-inverting input | Differential input node; same common-mode range as IN−; used for 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 or level-shifting in battery-ground-referenced designs. |
| Wide supply voltage tolerance | Operates from 2 V to 36 V - supports direct connection to automotive 12 V/24 V batteries and industrial 24 V PLC rails without regulators. |
| Low quiescent power | 0.2 mA supply current at 5 V (1 mW per comparator) - extends battery life in always-on telematics and ADAS subsystems. |
| AEC-Q100 qualified | Automotive Grade 1 qualification (−40 °C to +125 °C) with advanced screening per AEC-Q001/Q002 - ensures reliability in engine bay and chassis-mounted applications. |
| Overvoltage-tolerant inputs | Differential input range = ±36 V - permits direct connection to unregulated battery lines or motor-phase voltages without external clamping. |
Applications
| Battery Voltage Supervision | Motor Overcurrent Detection |
|---|---|
|
Use Scenario: Monitoring 12 V lead-acid or 48 V Li-ion battery pack voltage against under-voltage lockout (UVLO) and over-voltage protection (OVP) thresholds. IC Role / Device Role / Timing Role: Precision comparator comparing battery voltage against stable reference; triggers shutdown or warning flag via open-collector output. Use Value: ±2 mV offset ensures UVLO trips at 11.85 V ±5 mV, preventing deep discharge while avoiding nuisance shutdown during cranking transients. |
Use Scenario: Detecting excessive current in BLDC motor phase legs using shunt resistor voltage drop. IC Role / Device Role / Timing Role: High-speed comparator converting analog shunt voltage to digital fault signal; output drives MCU interrupt or gate driver disable. Use Value: 300 ns response time enables detection of <1 µs overcurrent events, protecting IGBTs before thermal runaway occurs. |
| Industrial Sensor Interface | Power Supply Sequencing |
|
Use Scenario: Converting output of NTC thermistor or pressure transducer into ON/OFF control signal for HVAC fan or valve actuator. IC Role / Device Role / Timing Role: Threshold detector with hysteresis (externally added); input referenced to ground, output pulled up to 3.3 V MCU rail. Use Value: 25 nA input bias current avoids measurement error in 100 kΩ+ sensor networks, preserving accuracy without buffer op-amps. |
Use Scenario: Ensuring correct power-up order of multi-rail FPGA or ASIC supplies (e.g., 12 V → 5 V → 1.2 V). IC Role / Device Role / Timing Role: Window comparator monitoring each rail; outputs wired-OR to enable downstream regulator only when all upstream rails are valid. Use Value: Rail-to-rail input range allows direct sensing of 1.2 V rail with 5 V supply, eliminating level-shifter ICs and reducing BOM count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-power, ground-sensing comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMV331Q1MFX/NOPB | Higher input offset (±7 mV max), no AEC-Q100 qualification, 36 V supply capable but input common-mode limited to VCC−0.1 V. | Not suitable for automotive under-hood use; acceptable for industrial control where ground-sensing not required. | Select only if AEC-Q100 is unnecessary and ±7 mV offset meets system accuracy budget. |
| NCS2200SQ2T2G | Lower supply current (1 µA typ), rail-to-rail input, but max supply 16 V and no guaranteed ground-sensing below −0.3 V. | Optimized for ultra-low-power IoT sensors; insufficient for 24 V industrial or 36 V automotive battery monitoring. | Prefer for battery-powered portable devices with <16 V rails and sub-µA standby targets. |
Compared with LMV331Q1MFX/NOPB and NCS2200SQ2T2G, TS391RIYLT uniquely combines AEC-Q100 qualification, true ground-sensing input, and 36 V operation - making it the only viable choice for automotive battery management and high-voltage industrial supervision where all three attributes are mandatory.
Availability
TS391RIYLT is available at Aetrix Electronics and suitable for automotive battery management, industrial motor control, sensor interface, and power supply sequencing requiring stable component supply across extended temperature and long product lifecycles.
Supply support for TS391RIYLT 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 automotive, industrial, 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 range, and automotive reliability.
FAQ
Is TS391RIYLT pin-compatible with TS391ILT?
Yes, TS391RIYLT and TS391ILT share identical SOT23-5 pinout (VCC+, IN−, OUT, VCC−, IN+) and electrical specifications, but TS391RIYLT adds AEC-Q100 Grade 1 qualification, enhanced ESD robustness (1500 V HBM), and tighter parametric screening for automotive use - making it a drop-in replacement where qualification is required.
Can TS391RIYLT drive a 5 V logic input directly?
No - TS391RIYLT has an open-collector output and cannot source current. To interface with 5 V logic, connect a pull-up resistor from OUT to the 5 V rail; the output will sink current to pull the node low. The maximum sink current is 6 mA minimum at 1.5 V saturation, sufficient for standard CMOS/TTL loads.
What is the maximum input voltage allowed when VCC+ = 5 V?
Either input can tolerate up to 30 V regardless of VCC+ level, per datasheet note: "either or both inputs can go to 30 V without damage." However, proper comparator function requires at least one input to remain within the common-mode range (0 V to VCC+ − 1.5 V = 3.5 V). The other may exceed that range up to 30 V for overvoltage fault detection.
Does TS391RIYLT require external hysteresis for noise immunity?
TS391RIYLT has no internal hysteresis. For noisy sensor inputs (e.g., motor current shunts), external positive feedback must be added via resistor network between OUT and IN+ to create ~10–50 mV hysteresis. Typical values: 1 MΩ from OUT to IN+, 10 kΩ from IN+ to signal source - ensuring clean switching without oscillation near threshold.
TS391RIYLT 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:
- Automotive
- Grade:
- AEC-Q100
- Qualification:
- Surface Mount
- :
- SOT-23-5
TS391RIYLT FAQ
1.How can I place an order for TS391RIYLT through Aetrix?
Please submit a Request for Quotation (RFQ) for TS391RIYLT 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 TS391RIYLT reliable?
The price and inventory of TS391RIYLT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS391RIYLT is usually 5 days.
3.What payment methods are accepted for TS391RIYLT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS391RIYLT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS391RIYLT?
TS391RIYLT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS391RIYLT 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 TS391RIYLT?
For technical support, including TS391RIYLT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS391RIYLT requirements.
6.How does Aetrix verify that TS391RIYLT is sourced from the original manufacturer or authorized distributors?
All TS391RIYLT 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 TS391RIYLT meets industry standards.
7.What is the process for return or replacement of TS391RIYLT?
All TS391RIYLT units undergo pre-shipment inspection (PSI). If there is an issue with TS391RIYLT, 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 TS391RIYLT part is unused and in its original packaging.
Return procedure for TS391RIYLT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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