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STMicroelectronics TS861AIDT
- Part No.:
- TS861AIDT
- Manufacturer:
- STMicroelectronics
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TS861AIDT.pdf
- Description:
- IC COMPARATOR 1 GEN PUR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,564
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Product details
Overview
TS861AIDT from STMicroelectronics is a rail-to-rail, micropower BiCMOS single comparator operating from 2.7 V to 10 V, consuming only 6 µA per comparator at 2.7 V, featuring 500 ns propagation delay with 100 mV overdrive, push-pull output eliminating external pull-up resistors, and specified for -40 °C to +85 °C operation in battery-powered smoke detectors.
For engineers reviewing the TS861AIDT datasheet, TS861AIDT pinout, TS861AIDT application, or TS861AIDT equivalent, this device is selected for ultra-low-power analog threshold detection where supply voltage headroom is constrained, output drive must interface directly with 3.3 V/5 V microcontrollers, and long-term stability under temperature variation is required.
Technical Context
The TS861AIDT uses a BiCMOS input stage enabling rail-to-rail common-mode input range (VCC−0.3 V to VCC+0.3 V) and ultra-low input bias current (1–600 pA), while its CMOS push-pull output delivers VOH = 2.35 V (at 2.7 V supply, ISOURCE = 2.5 mA) and VOL = 0.2 V (ISINK = 2.5 mA), ensuring direct logic-level compatibility.
Its internal architecture achieves a speed-to-power balance: large-signal voltage gain of 240 dB, CMRR of 65–75 dB across supply range, and propagation delay varying from 0.4 µs to 3 µs depending on overdrive and supply voltage-optimized for fast wake-up decisions in low-duty-cycle sensing systems.
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 5 V/9 V industrial rails without regulation. |
| Quiescent Current | 6 µA per comparator at 2.7 V - enables >10-year battery life in always-on smoke detectors with periodic sampling. |
| Propagation Delay | 500 ns at 2.7 V, 100 mV overdrive - ensures rapid response to fast-rising fault signals (e.g., smoke chamber ionization transients). |
| Input Offset Voltage | 3–18 mV (max) - sets minimum detectable differential voltage without calibration in threshold-comparison circuits. |
| Output Type | Push-pull CMOS - eliminates need for external pull-up resistor, reducing BOM count and PCB area in space-constrained SOT23-5 designs. |
| ESD Protection | 2 kV HBM - provides robustness against handling and board-level ESD events in portable end equipment. |
| Operating Temperature | -40 °C to +85 °C - qualified for industrial and consumer environmental conditions without derating. |
Pinout & Package
SOT23-5 micropackage (ECOPACK® compliant), 2.9 mm × 1.6 mm footprint, 1.3 mm height, thermal resistance RTHJA = 250 °C/W - optimized for minimal self-heating in sealed battery compartments.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (−) | Differential input terminal accepting reference or sensor signal; rail-to-rail capable down to VCC−0.3 V. |
| 2 | Non-inverting Input (+) | Differential input terminal accepting sensed signal; identical rail-to-rail range as Pin 1. |
| 3 | VCC+ | Positive supply connection; accepts 2.7–10 V DC; decoupling capacitor recommended near this pin. |
| 4 | Output | CMOS push-pull output driving high to ≥2.35 V (2.7 V supply) or low to ≤0.2 V - directly interfaces MCU GPIO or LED driver. |
| 5 | VCC− / GND | Ground reference; serves as return path for supply and output current; requires low-impedance connection to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail CMOS inputs | Enables full-supply-range sensing (e.g., detecting 0.1 V changes across 2.7 V battery voltage without level-shifting). |
| Ultra-low 6 µA quiescent current | Reduces average system power by >90% versus standard comparators, critical for 10+ year coin-cell operation. |
| Push-pull output stage | Eliminates external pull-up resistor, saving 0.5 mm² PCB area and removing a potential failure point in high-reliability alarms. |
| Latch-up immunity (Class A) | Guarantees no destructive latch-up under transient overvoltage or ESD stress, meeting IEC 61000-4-2 compliance requirements. |
| 2 kV HBM ESD rating | Withstands human-body discharge events during assembly and field service without functional degradation or parameter shift. |
Applications
| Smoke Detector Threshold Sensing | Portable Gas Monitor Reference Comparator |
|---|---|
|
Use Scenario: Detecting ionization current drop in optical smoke chambers during particle ingress. IC Role / Device Role / Timing Role: Single-threshold comparator comparing chamber current against precision reference; triggers MCU interrupt within 500 ns. Use Value: Enables sub-second alarm activation while maintaining <1 µA sleep current - extending AA battery life to 5 years. |
Use Scenario: Comparing electrochemical sensor output to calibrated toxic-gas concentration thresholds. IC Role / Device Role / Timing Role: Precision window comparator front-end (with external hysteresis) rejecting noise below 10 mV. Use Value: Achieves ±15 mV offset error budget over temperature, supporting EN 50545-1 gas alarm accuracy requirements. |
| Battery Voltage Monitor (Low-Battery Warning) | Wireless Sensor Node Wake-Up Trigger |
|
Use Scenario: Monitoring Li-ion cell voltage decay to initiate graceful shutdown before deep discharge. IC Role / Device Role / Timing Role: Fixed-threshold detector (e.g., 3.0 V) with hysteresis; output drives MCU reset or alert pin. Use Value: Operates down to 2.7 V supply and consumes only 6 µA - avoids parasitic drain that would accelerate battery depletion. |
Use Scenario: Detecting motion-induced vibration or ambient light change to wake ultra-low-power BLE sensor nodes. IC Role / Device Role / Timing Role: Fast-response comparator enabling sub-10 µs wake latency from deep sleep (nA mode). Use Value: 500 ns propagation delay ensures wake signal arrives before MCU clock stabilizes - minimizing wake latency jitter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar rail-to-rail micropower comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV3691IDBVR | Lower supply current (320 nA), but slower (5.5 µs delay), no push-pull output (open-drain), max VCC = 5.5 V. | Only suitable for sub-µA sleep monitoring; requires pull-up resistor and cannot drive MCU inputs directly. | Select when nanowatt sleep dominates design priority and response time >1 µs is acceptable. |
| MAX9021AXK+T | Higher supply current (12 µA), faster (220 ns), push-pull output, but wider offset (±5 mV typ), no rail-to-rail inputs. | Supports higher-speed wake-up but cannot sense near GND or VCC - limits use in battery-voltage tracking. | Select when propagation delay <300 ns is mandatory and input common-mode range above 0.2 V is sufficient. |
Compared with TLV3691IDBVR and MAX9021AXK+T, TS861AIDT uniquely balances 6 µA quiescent current, 500 ns speed, rail-to-rail inputs, and push-pull output - making it optimal for battery-powered safety-critical comparators where both power and timing margins are tight.
Availability
TS861AIDT is available at Aetrix Electronics and suitable for smoke/fire detection systems, portable gas monitors, battery voltage supervision, and wireless sensor node wake-up circuits requiring stable component supply across extended product lifecycles.
Supply support for TS861AIDT 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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The TS86x family was developed specifically for ultra-low-power, high-reliability threshold detection in battery-operated safety and environmental monitoring systems - emphasizing micropower operation, latch-up immunity, and robust ESD performance.
FAQ
What is the maximum supply voltage for TS861AIDT?
The absolute maximum supply voltage is 12 V, but the recommended operating range is 2.7 V to 10 V per the datasheet's electrical characteristics tables. Operation above 10 V voids guaranteed performance and may accelerate parametric drift over temperature and time.
Does TS861AIDT require external pull-up resistors on its output?
No. The TS861AIDT features a CMOS push-pull output stage capable of sourcing up to 2.5 mA and sinking up to 2.5 mA, allowing direct connection to 3.3 V or 5 V microcontroller GPIO pins without external components.
Can TS861AIDT operate with inputs at ground or VCC?
Yes. Its rail-to-rail CMOS input stage supports common-mode voltages from VCC−0.3 V to VCC+0.3 V, enabling valid operation with inputs at 0 V (GND) or VCC - essential for battery voltage monitoring and single-supply sensor interfaces.
Is TS861AIDT qualified for automotive applications?
No. TS861AIDT is specified for industrial temperature range (−40 °C to +85 °C) and is not AEC-Q100 qualified. ST offers automotive-grade alternatives like TS881IYLT for under-hood or dashboard applications requiring extended temperature and reliability validation.
TS861AIDT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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
- :
- 8-SOIC
TS861AIDT FAQ
1.How can I place an order for TS861AIDT through Aetrix?
Please submit a Request for Quotation (RFQ) for TS861AIDT 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 TS861AIDT reliable?
The price and inventory of TS861AIDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS861AIDT is usually 5 days.
3.What payment methods are accepted for TS861AIDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS861AIDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS861AIDT?
TS861AIDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS861AIDT 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 TS861AIDT?
For technical support, including TS861AIDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS861AIDT requirements.
6.How does Aetrix verify that TS861AIDT is sourced from the original manufacturer or authorized distributors?
All TS861AIDT 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 TS861AIDT meets industry standards.
7.What is the process for return or replacement of TS861AIDT?
All TS861AIDT units undergo pre-shipment inspection (PSI). If there is an issue with TS861AIDT, 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 TS861AIDT part is unused and in its original packaging.
Return procedure for TS861AIDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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