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STMicroelectronics TS7221AI1LT
- Part No.:
- TS7221AI1LT
- Manufacturer:
- STMicroelectronics
- Category:
- Comparators
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TS7221AI1LT.pdf
- Description:
- IC COMPARATOR 1 GEN PUR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,985
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Product details
Overview
TS7221AI1LT from STMicroelectronics is a single BiCMOS rail-to-rail micropower comparator in SOT23-5 package, designed for ultra-low-power sensing and threshold detection in battery-constrained systems. It operates from 2.7 V to 10 V, draws only 6 µA typical supply current at 5 V, achieves 0.5 µs response time at 100 mV overdrive, and features open-drain output with rail-to-rail input common-mode range extending ±0.3 V beyond supplies.
For engineers reviewing the TS7221AI1LT datasheet, TS7221AI1LT pinout, TS7221AI1LT application, or TS7221AI1LT equivalent, this device is selected for precision low-power voltage monitoring in portable instrumentation, PCMCIA power sequencing, and security system voltage supervisors where sub-1 µA quiescent current and wide supply tolerance are critical.
Technical Context
The TS7221AI1LT implements a BiCMOS input stage enabling rail-to-rail common-mode operation down to 0 V and up to VCC + 0.3 V across its full temperature range (–40 °C to +105 °C). Its open-drain output supports wired-OR logic and flexible pull-up voltage selection independent of VCC.
It delivers 70 dB CMRR and 80 dB PSRR at 5 V, with input offset voltage tightly specified at 7–15 mV (A-grade) and drift of only 6 µV/°C - enabling stable DC-coupled comparisons without external trimming in industrial sensor interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7 V to 10 V - supports direct connection to Li-ion, 3.3 V, and 9 V battery rails without regulation. |
| Quiescent Current | 6 µA typical at 5 V - enables >10-year battery life in always-on voltage monitors with 200 µAh coin cells. |
| Response Time | 0.4 µs high-to-low / 0.5 µs low-to-high at 100 mV overdrive - sufficient for fast fault detection in power sequencers. |
| Input Offset Voltage | 7–15 mV (A-grade, –40 °C to +105 °C) - ensures reliable 50 mV threshold detection across automotive-grade temperature range. |
| Input Bias Current | 1–600 pA - permits use with high-impedance sensor sources (e.g., thermistors, photodiodes) without signal loading. |
| Common-Mode Range | –0.3 V to VCC + 0.3 V - allows direct sensing of ground-referenced or supply-referenced signals without level-shifting. |
| ESD Protection | 2 kV HBM - meets IEC 61000-4-2 Level 2 for handheld and field-deployable equipment robustness. |
Pinout & Package
SOT23-5 package: 2.9 mm × 2.8 mm × 1.3 mm body, 0.95 mm pitch, gull-wing leads, ECOPACK® RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC– (GND) | Ground reference for internal circuitry; must be connected to system ground plane for stable biasing. |
| 2 | IN+ | Non-inverting input; accepts rail-to-rail analog voltages from –0.3 V to VCC + 0.3 V. |
| 3 | IN– | Inverting input; matched to IN+ for differential sensing with <15 mV offset error over temperature. |
| 4 | VCC+ | Positive supply rail; powers internal BiCMOS comparator core and output stage. |
| 5 | OUT | Open-drain output; requires external pull-up to define logic-high level (e.g., 1.8 V, 3.3 V, or 5 V). |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input stage | Enables direct comparison of signals referenced to GND or VCC, eliminating need for input resistive dividers or level shifters. |
| 6 µA supply current at 5 V | Reduces average power to <30 µW, allowing integration into energy-harvesting nodes with microampere-level budget constraints. |
| 0.5 µs propagation delay | Supports real-time overvoltage/undervoltage lockout in DC-DC converters with <10 µs fault response requirements. |
| Open-drain output with 5 mA sink capability | Permits interface with mixed-voltage logic families and enables shared-bus alarm signaling in multi-supply systems. |
| –40 °C to +105 °C operating range | Validated for extended-temperature industrial applications including outdoor metering and factory automation controllers. |
Applications
| Battery Voltage Monitor | PCMCIA Card Power Sequencer |
|---|---|
|
Use Scenario: Monitoring Li-ion cell voltage during charging/discharging to trigger cutoff at 2.8 V and 4.2 V thresholds. IC Role / Device Role / Timing Role: Precision comparator detecting voltage crossing with <15 mV hysteresis via external resistor network. Use Value: 6 µA quiescent current extends standby runtime by >3× versus standard comparators, while rail-to-rail inputs eliminate level-shifter ICs. |
Use Scenario: Enforcing strict power-up sequence on PCMCIA Type II cards: VCC must stabilize before VPP is enabled. IC Role / Device Role / Timing Role: Dual-threshold detector generating enable pulses for discrete MOSFET power switches. Use Value: 0.5 µs response ensures timing margin compliance per PCMCIA specification, and open-drain output simplifies OR-ing of multiple card status signals. |
| Security System Intrusion Detector | Portable Medical Sensor Interface |
|
Use Scenario: Detecting tamper-induced voltage drop on perimeter fence line using resistive divider and reference voltage. IC Role / Device Role / Timing Role: Low-power window comparator triggering alarm when line voltage falls outside 3.0–3.4 V band. Use Value: Sub-10 µA total system current (comparator + pull-up) enables 5-year operation on AA batteries; ESD-hardened inputs survive field wiring transients. |
Use Scenario: Converting thermistor resistance changes into digital alerts for fever detection in handheld clinical thermometers. IC Role / Device Role / Timing Role: High-impedance comparator interfacing directly to 100 kΩ NTC thermistor without buffer amplifier. Use Value: 1 pA input bias current prevents measurement error from thermistor self-heating; rail-to-rail input accommodates full 0–3 V sensor swing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV3691IDBVR | Lower 320 nA supply current but only 1.8–5.5 V supply range; 15 µs response time; push-pull output. | Not suitable for 9 V battery or 10 V industrial rails; lacks open-drain flexibility for wired-OR alarms. | Select when ultra-low power dominates speed and output topology requirements. |
| MAX9021AUT+T | Higher 12 µA supply current; 125 ns response; rail-to-rail input; open-drain output; –40 °C to +125 °C rating. | Acceptable for same applications but consumes double the current; wider temp range suits under-hood automotive. | Select when faster response and extended temperature margin justify higher quiescent power. |
Compared with TLV3691IDBVR and MAX9021AUT+T, the TS7221AI1LT uniquely balances sub-10 µA consumption, 0.5 µs speed, 2.7–10 V operation, and open-drain output in a single SOT23-5 footprint - making it optimal for cost- and space-constrained industrial battery monitors requiring wide supply compatibility.
Availability
TS7221AI1LT is available at Aetrix Electronics and suitable for battery-powered systems, PCMCIA card power management, and security system voltage supervision requiring stable component supply across extended temperature ranges.
Supply support for TS7221AI1LT 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, delivering silicon solutions for smart driving, power management, and sensing applications.
The TS7221 belongs to ST's precision analog comparator product line, engineered specifically for ultra-low-power, rail-to-rail sensing in portable and industrial equipment where size, energy efficiency, and temperature resilience are primary design constraints.
FAQ
Can TS7221AI1LT operate with a 1.8 V supply?
No. The TS7221AI1LT has a minimum supply voltage of 2.7 V, as confirmed in Table 2 of the datasheet. Operation below 2.7 V is not characterized or guaranteed, and internal BiCMOS circuitry may fail to bias correctly, resulting in undefined output behavior or excessive supply current.
What is the maximum sink current for the open-drain output?
The TS7221AI1LT output can sink up to 5 mA while maintaining VOL ≤ 0.45 V at +85 °C, per Table 3–5 electrical characteristics. Exceeding 5 mA risks violating the absolute maximum rating of ±30 mA and may cause thermal shutdown or parametric shift in high-temperature operation.
Does TS7221AI1LT require an external hysteresis network?
Yes - the device has no internal hysteresis. For noise-immune threshold detection, a positive feedback resistor from OUT to IN+ is required. Typical values range from 100 kΩ to 10 MΩ depending on desired hysteresis width and source impedance, as validated in ST application note AN2731.
Is the TS7221AI1LT pin-compatible with TS7221AILT?
Yes - both share identical SOT23-5 pinout (VCC–, IN+, IN–, VCC+, OUT), same footprint, and identical electrical specifications except for temperature grade: AI1LT is rated –40 °C to +105 °C, while AILT is –40 °C to +85 °C. No layout change is needed for upgrade.
TS7221AI1LT 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:
- Open-Drain
- Voltage - Supply, Single/Dual (±):
- 2.7V ~ 10V
- :
- 7mV @ 5V
- Voltage - Input Offset (Max):
- 300pA @ 5V
- Current - Input Bias (Max):
- 30mA
- Current - Output (Typ):
- 16µA
- Current - Quiescent (Max):
- 70dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 105°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- SOT-23-5
TS7221AI1LT FAQ
1.How can I place an order for TS7221AI1LT through Aetrix?
Please submit a Request for Quotation (RFQ) for TS7221AI1LT 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 TS7221AI1LT reliable?
The price and inventory of TS7221AI1LT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS7221AI1LT is usually 5 days.
3.What payment methods are accepted for TS7221AI1LT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS7221AI1LT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS7221AI1LT?
TS7221AI1LT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS7221AI1LT 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 TS7221AI1LT?
For technical support, including TS7221AI1LT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS7221AI1LT requirements.
6.How does Aetrix verify that TS7221AI1LT is sourced from the original manufacturer or authorized distributors?
All TS7221AI1LT 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 TS7221AI1LT meets industry standards.
7.What is the process for return or replacement of TS7221AI1LT?
All TS7221AI1LT units undergo pre-shipment inspection (PSI). If there is an issue with TS7221AI1LT, 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 TS7221AI1LT part is unused and in its original packaging.
Return procedure for TS7221AI1LT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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