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STMicroelectronics TS861ID
- Part No.:
- TS861ID
- Manufacturer:
- STMicroelectronics
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TS861ID.pdf
- Description:
- IC COMPARATOR 1 GEN PUR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,192
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Product details
Overview
TS861ID 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 rated for -40 °C to +85 °C - deployed in battery-powered smoke detectors and portable communication systems.
For engineers reviewing the TS861ID datasheet, TS861ID pinout, TS861ID application, or TS861ID equivalent, key selection criteria include ultra-low supply current, rail-to-rail CMOS input range, push-pull output drive capability, guaranteed propagation delay across voltage/temperature, and SOT23-5/SO-8 package compatibility for space-constrained designs.
Technical Context
The TS861ID implements a BiCMOS input stage enabling rail-to-rail common-mode input voltage range (VCC − 0.3 V to VCC + 0.3 V) and low input offset voltage (3–18 mV), while its push-pull CMOS output delivers VOH = 2.35 V / VOL = 0.2 V at 2.5 mA load under 2.7 V supply. It achieves 500 ns response time with 100 mV overdrive at 2.7 V, scaling to 3 µs at 10 V with 10 mV overdrive.
Designed for micropower operation, it maintains latch-up immunity (Class A), 2 kV HBM ESD protection, and stable performance across 2.7–10 V supply and -40 °C to +85 °C ambient - with input bias current ≤600 pA and offset drift of 6 µV/°C ensuring precision in low-drift sensor interface applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7 V to 10 V - supports single-cell Li-ion, dual-cell alkaline, and regulated 3.3 V/5 V rails without level-shifting. |
| Supply Current | 6 µA per comparator at 2.7 V - enables >1-year battery life in coin-cell–powered devices with duty-cycled wake-up. |
| Propagation Delay | 500 ns at 2.7 V, 100 mV overdrive - sufficient for fast threshold detection in alarm triggers and analog watchdog circuits. |
| Input Offset Voltage | 3–18 mV (typ./max.) - allows accurate window or zero-crossing detection in low-voltage sensor signal chains. |
| Output Type | Push-pull CMOS - drives microcontroller GPIO directly; eliminates pull-up resistor, saving board space and leakage path. |
| Input Common-Mode Range | Rail-to-rail (VCC − 0.3 V to VCC + 0.3 V) - accepts signals near supply rails, critical for battery voltage monitoring and reference comparison. |
| ESD Protection | 2 kV HBM - provides robustness against handling and system-level electrostatic events in portable end equipment. |
Pinout & Package
TS861ID is packaged in SO-8 (small outline integrated circuit, 8-pin, 150 mil width), with thermal resistance RTHJA = 125 °C/W and RTHJC = 40 °C/W - suitable for moderate-power, thermally constrained PCB layouts.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (−) | Differential input node accepting reference or sensed signal; rail-to-rail compatible down to VCC−0.3 V. |
| 2 | Non-inverting Input (+) | Differential input node accepting variable signal; full rail-to-rail common-mode range enables direct battery sensing. |
| 3 | Output | Push-pull CMOS output; sinks/sours ≥2.5 mA; logic-high ≈ VCC − 0.35 V, logic-low ≈ 0.2 V at 2.7 V supply. |
| 4 | GND | Analog ground reference; must be low-impedance and separated from digital ground in mixed-signal systems. |
| 5 | VCC+ | Positive supply pin; accepts 2.7–10 V; decoupling capacitor (100 nF) required within 5 mm for stability. |
| 6 | NC | No connect - internally unconnected; must remain floating or tied to GND per layout best practice. |
| 7 | NC | No connect - internally unconnected; must remain floating or tied to GND per layout best practice. |
| 8 | NC | No connect - internally unconnected; must remain floating or tied to GND per layout best practice. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 6 µA at 2.7 V - extends battery life in always-on detection nodes such as fire alarms and CO sensors. |
| Rail-to-rail CMOS inputs | VICM = VCC − 0.3 V to VCC + 0.3 V - enables direct comparison of battery voltage, thermistor dividers, or photodiode outputs without biasing. |
| Push-pull output stage | Drives MCU GPIO directly - removes need for external pull-up, reducing BOM count and PCB footprint in compact modules. |
| Fast propagation with low overdrive sensitivity | 500 ns @ 100 mV overdrive, 2 µs @ 10 mV overdrive at 2.7 V - ensures reliable triggering even with noisy or slowly ramping input signals. |
| Latch-up immunity (Class A) | Guaranteed per JEDEC JESD78 - prevents destructive failure during transient overvoltage or supply sequencing anomalies. |
Applications
| Smoke Detector Threshold Sensing | Portable Medical Pulse Oximeter Analog Comparator |
|---|---|
|
Use Scenario: Detecting smoke-induced opacity changes in optical chamber using photodiode current differential amplified into comparator input. IC Role / Device Role / Timing Role: Single comparator comparing amplified photodiode signal against adjustable reference to trigger alarm when smoke obscures light path. Use Value: 6 µA supply current enables multi-year operation on CR123A battery; rail-to-rail input accepts near-ground signal swing from transimpedance amplifier. |
Use Scenario: Converting pulsatile photoplethysmography (PPG) signal into clean digital edge for heart rate calculation in wearable oximeters. IC Role / Device Role / Timing Role: High-speed, low-noise comparator converting analog PPG waveform into synchronous digital pulse train for microcontroller timer capture. Use Value: 500 ns propagation delay preserves pulse timing fidelity; push-pull output interfaces directly to 1.8 V/3.3 V MCU I/O without level translation. |
| Battery Voltage Monitor in IoT Sensor Node | Low-Power Door/Window Contact Alarm |
|
Use Scenario: Monitoring Li-ion cell voltage during sleep mode to initiate wake-up or shutdown before deep discharge. IC Role / Device Role / Timing Role: Comparator configured as undervoltage lockout (UVLO), comparing battery voltage against precision bandgap reference. Use Value: Rail-to-rail input accommodates full 2.7–4.2 V battery range; 6 µA current adds negligible load during 99%+ sleep duty cycle. |
Use Scenario: Detecting magnetic reed switch closure in security sensors powered by AA batteries with 10-year shelf life requirement. IC Role / Device Role / Timing Role: Comparator latching open/closed state of reed switch against weak pull-up, driving interrupt line to ultra-low-power MCU. Use Value: Push-pull output eliminates external pull-up resistor - removing 100 kΩ–1 MΩ leakage path that would degrade standby current and shelf life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar single-rail-to-rail micropower comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV333IDR | Lower offset (150 µV typ.), higher supply current (17 µA), 1.8–5.5 V range only. | Requires ≥1.8 V supply; unsuitable for 9 V battery or 10 V industrial rails where TS861ID operates. | Select TLV333IDR only if sub-mV offset is mandatory and supply is limited to ≤5.5 V. |
| MAX9021ASA+ | Higher speed (120 ns), higher current (12 µA), no rail-to-rail inputs, ±0.2 V input range limitation. | Cannot accept signals near VCC or GND; requires input biasing network, increasing component count and leakage. | Choose MAX9021ASA+ only when nanosecond response is critical and input signals are centered mid-supply. |
Compared with TLV333IDR and MAX9021ASA+, TS861ID uniquely balances ultra-low 6 µA current, full rail-to-rail input, 2.7–10 V operation, and SO-8 compatibility - making it optimal for long-life, wide-supply, space-constrained battery systems where precision and flexibility outweigh raw speed.
Availability
TS861ID is available at Aetrix Electronics and suitable for battery-powered smoke detectors, portable medical sensors, and industrial IoT node voltage monitoring requiring stable component supply across extended temperature and multi-year production cycles.
Supply support for TS861ID 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, designing and manufacturing analog, microcontroller, power, and sensor 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 longevity, reliability, and ease of integration without external components.
FAQ
What is the maximum operating supply voltage for TS861ID?
The absolute maximum supply voltage is 12 V, but the specified operational range is 2.7 V to 10 V per datasheet Table 2. Operation above 10 V voids parametric guarantees and risks exceeding junction temperature limits due to increased ICC and power dissipation - design must stay within 10 V for production compliance.
Does TS861ID require external pull-up resistors on its output?
No. TS861ID features a push-pull CMOS output stage capable of sourcing and sinking ≥2.5 mA, allowing direct connection to microcontroller GPIO pins. This eliminates external pull-up resistors, reducing BOM cost, PCB area, and standby current leakage paths in battery-critical designs.
Can TS861ID operate with input voltages equal to VCC or GND?
Yes. Its rail-to-rail CMOS input stage supports common-mode voltage from VCC − 0.3 V to VCC + 0.3 V, meaning it accepts inputs at GND (0 V) and up to VCC + 0.3 V. This enables direct interfacing with battery terminals, resistive divider outputs, and sensor amplifiers without level-shifting networks.
Is TS861ID pin-compatible with other comparators in the TS86x family?
TS861ID (SO-8) shares identical pinout with TS862ID (dual) and TS864ID (quad) in SO-8 and SO-14 packages respectively only for the active pins (1–5); however, TS861ID has three NC pins (6–8), while TS862ID uses all eight pins. Direct substitution is not electrically safe without verifying pin function mapping and layout adaptation.
TS861ID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- General Purpose
- Number of Elements:
- 1
- Output Type:
- Push-Pull
- Voltage - Supply, Single/Dual (±):
- 2.7V ~ 10V
- :
- 15mV @ 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
TS861ID FAQ
1.How can I place an order for TS861ID through Aetrix?
Please submit a Request for Quotation (RFQ) for TS861ID 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 TS861ID reliable?
The price and inventory of TS861ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS861ID is usually 5 days.
3.What payment methods are accepted for TS861ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS861ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS861ID?
TS861ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS861ID 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 TS861ID?
For technical support, including TS861ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS861ID requirements.
6.How does Aetrix verify that TS861ID is sourced from the original manufacturer or authorized distributors?
All TS861ID 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 TS861ID meets industry standards.
7.What is the process for return or replacement of TS861ID?
All TS861ID units undergo pre-shipment inspection (PSI). If there is an issue with TS861ID, 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 TS861ID part is unused and in its original packaging.
Return procedure for TS861ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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