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STMicroelectronics TS861AILT
- Part No.:
- TS861AILT
- Manufacturer:
- STMicroelectronics
- Category:
- Comparators
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TS861AILT.pdf
- Description:
- IC COMPARATOR 1 GEN PUR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:14,165
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Product details
Overview
TS861AILT from STMicroelectronics is a rail-to-rail, micropower BiCMOS single comparator optimized for battery-powered systems. It operates from 2.7 V to 10 V, consumes only 6 µA per comparator at 2.7 V, features push-pull output (eliminating external pull-up resistors), and delivers 500 ns propagation delay with 100 mV overdrive - enabling use in smoke/fire detectors and portable communication systems.
For engineers reviewing the TS861AILT datasheet, TS861AILT pinout, TS861AILT application, or TS861AILT equivalent, key selection criteria include ultra-low supply current, rail-to-rail CMOS input range, push-pull output drive capability, guaranteed operation across –40 °C to +85 °C, and SOT23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The TS861AILT implements a BiCMOS input stage enabling rail-to-rail common-mode input voltage range (VCC–0.3 V to VCC+0.3 V) while maintaining low input bias current (≤600 pA) and low input offset voltage (max 18 mV). Its push-pull CMOS output drives directly into microcontroller GPIOs without external components.
It achieves a speed-to-power ratio of 500 ns propagation delay at 6 µA supply current under 100 mV overdrive at 2.7 V, with large-signal voltage gain ≥240 dB and CMRR ≥65 dB across its full operating voltage and temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7 V to 10 V - supports single-cell Li-ion, dual-cell alkaline, and wide-input industrial rails. |
| Quiescent Current | 6 µA per comparator at 2.7 V - enables multi-year battery life in always-on sensing nodes. |
| Propagation Delay | 500 ns at 100 mV overdrive, 2.7 V - ensures timely response in fast alarm-triggering circuits. |
| Input Offset Voltage | Max 18 mV (–40 °C to +85 °C) - sufficient for threshold detection in gas/smoke sensors with moderate hysteresis. |
| Output Type | Push-pull CMOS - eliminates need for external pull-up resistors, reducing BOM count and board area. |
| Input Common-Mode Range | Rail-to-rail (VCC–0.3 V to VCC+0.3 V) - allows direct interface with sensors operating near supply rails. |
| ESD Protection | 2 kV HBM - provides robustness during handling and PCB assembly in high-volume manufacturing. |
Pinout & Package
SOT23-5 micropackage (ECOPACK® compliant), 1.3 mm × 2.9 mm footprint, 0.95 mm pitch, surface-mountable with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (–) | Differential input node accepting signals up to VCC+0.3 V; rail-to-rail capable. |
| 2 | Non-inverting Input (+) | Differential input node with identical rail-to-rail voltage range as Pin 1. |
| 3 | VCC+ | Positive supply terminal; must be decoupled locally with 100 nF ceramic capacitor. |
| 4 | Output | CMOS push-pull output driving high/low actively; compatible with 1.8 V–5 V logic inputs. |
| 5 | VCC– | Ground reference terminal; requires low-impedance connection to system GND plane. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail CMOS inputs | Enables accurate threshold detection across full supply range without level-shifting circuitry. |
| Push-pull output stage | Directly interfaces with MCU GPIOs, removing external pull-up resistors and associated leakage paths. |
| 6 µA supply current at 2.7 V | Extends battery life in coin-cell–powered devices such as wireless smoke alarms beyond 5 years. |
| 500 ns propagation delay (100 mV overdrive) | Meets real-time response requirements in safety-critical detection applications like fire alarms. |
| Latch-up immunity (Class A) | Guarantees no destructive latch-up under transient overvoltage or ESD stress conditions. |
Applications
| Smoke/Fire Detectors | Portable Communication Systems |
|---|---|
Use Scenario: Continuous monitoring of ionization chamber or optical sensor output for rapid smoke particle detection. IC Role / Device Role / Timing Role: Comparator compares sensor signal against precision reference to trigger alarm when threshold exceeded. Use Value: Ultra-low 6 µA quiescent current minimizes standby power draw; push-pull output directly asserts MCU interrupt line without pull-up. | Use Scenario: Signal presence detection in Bluetooth/Wi-Fi module power management, e.g., wake-on-ring or activity sensing. IC Role / Device Role / Timing Role: Threshold detector enabling low-power sleep mode entry/exit based on RF activity or audio envelope level. Use Value: 500 ns response time ensures sub-millisecond wake latency; rail-to-rail inputs accommodate varying sensor output ranges. |
| Battery-Powered Alarms | Gas Detection Systems |
Use Scenario: Low-battery warning circuit comparing cell voltage against cutoff threshold in security or medical alert devices. IC Role / Device Role / Timing Role: Precision voltage monitor with hysteresis preventing oscillation near trip point. Use Value: Max 18 mV input offset ensures accurate 2.7 V–3.0 V detection window; stable performance over –40 °C to +85 °C ensures field reliability. | Use Scenario: Electrochemical sensor signal conditioning in CO or methane detectors requiring low-drift threshold comparison. IC Role / Device Role / Timing Role: High-impedance input comparator rejecting noise while detecting small gas-concentration–induced voltage shifts. Use Value: ≤600 pA input bias current prevents loading of high-Z sensor electrodes; 2 kV HBM ESD rating protects against handling damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV333IDBVR | Lower 170 nA supply current but slower 15 µs propagation delay; rail-to-rail input/output; open-drain output. | Requires external pull-up resistor; unsuitable for fast alarm triggering but better for nanoamp sensor biasing. | Select TLV333IDBVR only when ultra-low current dominates over speed and output drive capability. |
| MAX9021AUT+T | 6 µA supply current, 300 ns propagation delay, push-pull output, but narrower 1.8 V–5.5 V supply range. | Not suitable for 9 V battery or 10 V industrial rails; superior speed for same power envelope. | Choose MAX9021AUT+T when operating strictly within 1.8–5.5 V and sub-300 ns response is required. |
Compared with TLV333IDBVR and MAX9021AUT+T, the TS861AILT uniquely balances 6 µA current, 500 ns speed, rail-to-rail inputs, push-pull output, and 2.7–10 V supply flexibility - making it optimal for cost-sensitive, battery-powered safety systems needing reliable, self-contained threshold detection.
Availability
TS861AILT is available at Aetrix Electronics and suitable for smoke/fire detectors, portable communication systems, and battery-powered alarms requiring stable component supply across extended production lifecycles.
Supply support for TS861AILT 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 analog, mixed-signal, power, and microcontroller solutions for industrial, automotive, and consumer markets.
The TS86x comparator family was developed specifically for ultra-low-power, rail-to-rail sensing in battery-operated safety and portable equipment - emphasizing long service life, robustness, and minimal external component count.
FAQ
What is the maximum supply voltage for TS861AILT?
The absolute maximum supply voltage is 12 V, but the device is characterized and guaranteed for continuous operation from 2.7 V to 10 V. Operation above 10 V voids parametric guarantees and risks exceeding thermal limits due to increased power dissipation in the SOT23-5 package.
Does TS861AILT require external pull-up resistors on its output?
No. The TS861AILT features a CMOS push-pull output stage capable of actively driving both high and low logic states. This eliminates the need for external pull-up resistors, simplifying design and reducing power loss in battery-critical applications.
Can TS861AILT operate with inputs at the negative rail (GND)?
Yes. Its rail-to-rail CMOS input stage supports common-mode voltages from VCC–0.3 V to VCC+0.3 V, meaning it accepts inputs down to GND (VCC–) and up to VCC+0.3 V - enabling direct interface with ground-referenced sensors and references.
Is TS861AILT qualified for automotive applications?
No. TS861AILT is specified for industrial temperature range (–40 °C to +85 °C) and is not AEC-Q100 qualified. For automotive use, ST offers the TS861IYLT variant (discontinued) or newer automotive-grade comparators like TS881IYLT with extended qualification and enhanced ESD/latch-up robustness.
TS861AILT 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:
- Push-Pull
- Voltage - Supply, Single/Dual (±):
- 2.7V ~ 10V
- :
- 7mV @ 5V
- Voltage - Input Offset (Max):
- 300pA @ 5V
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 16µA
- Current - Quiescent (Max):
- 70dB CMRR
- CMRR, PSRR (Typ):
- 2µs
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- SOT-23-5
TS861AILT FAQ
1.How can I place an order for TS861AILT through Aetrix?
Please submit a Request for Quotation (RFQ) for TS861AILT 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 TS861AILT reliable?
The price and inventory of TS861AILT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS861AILT is usually 5 days.
3.What payment methods are accepted for TS861AILT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS861AILT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS861AILT?
TS861AILT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS861AILT 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 TS861AILT?
For technical support, including TS861AILT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS861AILT requirements.
6.How does Aetrix verify that TS861AILT is sourced from the original manufacturer or authorized distributors?
All TS861AILT 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 TS861AILT meets industry standards.
7.What is the process for return or replacement of TS861AILT?
All TS861AILT units undergo pre-shipment inspection (PSI). If there is an issue with TS861AILT, 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 TS861AILT part is unused and in its original packaging.
Return procedure for TS861AILT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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