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STMicroelectronics TSM109AID
- Part No.:
- TSM109AID
- Manufacturer:
- STMicroelectronics
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TSM109AID.pdf
- Description:
- IC COMPARATOR 2 W/VOLT REF 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,949
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Product details
Overview
TSM109AID from STMicroelectronics is a dual comparator with integrated 2.5V shunt voltage reference in SO-8 package, operating from ±1V to ±18V supply, featuring ±1mV typical input offset voltage, 25nA typical input bias current, and 250mV typical low-level output saturation voltage at 4mA sink - used for overvoltage detection and precision threshold monitoring in industrial power supplies.
For engineers reviewing the TSM109AID datasheet, TSM109AID pinout, TSM109AID application, or TSM109AID equivalent, key selection criteria include its dual-comparator + reference integration, rail-to-rail differential input range, ground-sensing capability, and 0.4% initial Vref accuracy - critical for compact, cost-sensitive analog monitoring circuits.
Technical Context
The TSM109AID integrates two independent PNP-input comparators sharing a single 2.5V precision shunt reference. Each comparator supports input common-mode voltage down to ground and differential input swing up to full supply (±18V), enabling direct sensing of signals referenced to system ground without level-shifting.
The internal reference operates as a 2-terminal shunt regulator with 1–100mA cathode current range, 0.3Ω dynamic impedance, and ±13ppm/°C temperature coefficient. Comparator outputs are open-collector, requiring external pull-up, and deliver 20mA sink capability with 300ns large-signal response under TTL-compatible conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | ±1V to ±18V - supports bipolar and wide-range single-supply operation without external regulation |
| Reference Voltage | 2.490–2.510V (TSM109A, 0.4% tolerance) - enables precise 2.5V threshold generation with minimal calibration |
| Input Offset Voltage | ±1mV typ - ensures accurate switching at small signal differentials, e.g., <2mV overvoltage detection |
| Input Bias Current | 25nA typ - minimizes loading on high-impedance sensor nodes or RC timing networks |
| Output Sink Current | 20mA max - drives LEDs, optocouplers, or logic inputs directly without buffer stages |
| Response Time | 300ns (large-signal, TTL load) - suitable for fast fault detection in switched-mode power supplies |
| Common-Mode Range | Includes ground (0V) - allows direct interface to ground-referenced sensors or battery terminals |
Pinout & Package
SO-8 package (small outline, surface-mount), 1.27mm pitch, body size 4.9 × 6.0 mm, thermal resistance RthJA = 175°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for both comparators and reference; must be low-impedance return path |
| 2 | Ve+ | Non-inverting input of Comparator 1 - accepts signals from 0V to VCC−1.5V |
| 3 | Ve+ | Inverting input of Comparator 2 - shared with pin 2 for reference-connected configuration |
| 4 | Ve− | Inverting input of Comparator 1 - typically connected to sensed voltage for overvoltage trip |
| 5 | Out | Open-collector output of Comparator 1 - requires external pull-up to define logic HIGH level |
| 6 | Vcc | Positive supply terminal - powers both comparators and reference circuitry |
| 7 | Vref | Shunt reference cathode - connects to external resistor to set reference current (1–100mA) |
| 8 | Out | Open-collector output of Comparator 2 - independently controllable, same drive capability as pin 5 |
Key Features
| Feature | Design Value |
|---|---|
| Dual comparator + 2.5V reference integration | Reduces board area by >40% vs. discrete comparator + TL431 solution in PSU feedback and protection circuits |
| Ground-sensing input common-mode range | Enables direct monitoring of battery negative terminals or low-side current shunts without level shifters |
| 0.4% initial Vref accuracy (TSM109A) | Eliminates need for post-assembly trimming in factory-set voltage thresholds (e.g., 12V ±5% OVP) |
| 25nA input bias current | Permits use with MΩ-range divider networks for high-voltage sensing while maintaining <0.1% error |
| 300ns large-signal response | Supports cycle-by-cycle overcurrent shutdown in DC-DC controllers operating up to 500kHz |
Applications
| AC-DC Power Supply OVP | Industrial Sensor Threshold Detection |
|---|---|
Use Scenario: Monitoring rectified AC bus voltage in offline SMPS to trigger shutdown before capacitor overvoltage. IC Role / Device Role / Timing Role: Comparator 1 compares scaled bus voltage against internal 2.5V reference; Comparator 2 monitors auxiliary rail. Use Value: Single-chip solution replaces 3 discrete parts (2x comparators + 1x reference), reducing BOM count and layout complexity. | Use Scenario: Detecting out-of-range temperature sensor output (e.g., PT100 bridge) in PLC analog input modules. IC Role / Device Role / Timing Role: One comparator acts as high-threshold detector, the other as low-threshold detector - enabling window-compare functionality. Use Value: Ground-referenced inputs eliminate need for instrumentation amplifiers or level-shifters when interfacing with 4-wire RTD bridges. |
| Battery Management System (BMS) Cell Balancing Enable | Programmable Logic Controller (PLC) Digital Input Conditioning |
Use Scenario: Enabling passive cell balancing when individual Li-ion cell voltage exceeds 4.25V. IC Role / Device Role / Timing Role: Internal reference sets 2.5V threshold; external resistor divider scales 4.25V to 2.5V for precise trip point. Use Value: 0.4% Vref accuracy ensures ±17mV absolute trip tolerance across temperature, meeting IEC 62133 cell protection requirements. | Use Scenario: Converting 0–24V industrial field signals into clean 3.3V/5V logic levels for microcontroller GPIO. IC Role / Device Role / Timing Role: Comparator 1 detects rising edge (ON), Comparator 2 detects falling edge (OFF); outputs feed Schmitt-trigger inputs. Use Value: 25nA input bias current prevents loading of high-impedance field wiring, maintaining noise immunity per IEC 61000-4-5 surge standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-comparator-with-reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV431AIDBZR | Single adjustable shunt reference only; no comparators - requires external dual comparator (e.g., LM393) | Higher component count and PCB area; lacks integrated dual-comparator timing coordination | Choose when reference adjustability (1.24–6V) is required over integration |
| LM393DR | Dual comparator only; no internal reference - requires external precision reference (e.g., REF3025) | Greater design flexibility but adds 3–5 components and calibration steps | Choose when higher speed (>1µs response) or rail-to-rail input beyond ±18V is needed |
Compared with TLV431AIDBZR and LM393DR, the TSM109AID delivers verified 0.4% reference accuracy and matched comparator-reference thermal tracking in one SO-8 package - reducing total solution size by ≥35% and eliminating inter-component drift in temperature-critical monitoring.
Availability
TSM109AID is available at Aetrix Electronics and suitable for industrial power supply management, battery protection systems, and sensor interface circuits requiring stable component supply across extended temperature ranges (−40°C to +105°C).
Supply support for TSM109AID 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 TSM109AID belongs to ST's precision analog monitoring product line, engineered specifically for space-constrained power management and fault-detection applications where integration, accuracy, and temperature stability are critical.
FAQ
Can TSM109AID operate from a single 5V supply?
Yes. The device supports single-supply operation from +2V to +36V (or ±1V to ±18V). With VCC = +5V and GND = 0V, both comparators function fully, and the 2.5V reference remains stable with cathode current between 1mA and 100mA - confirmed per Electrical Characteristics table on page 5 of the official ST datasheet.
Is the internal reference usable independently of the comparators?
Yes. Pin 7 (Vref) is the cathode of a 2-terminal shunt reference. It can be used standalone by connecting an external resistor from VCC to Vref to set cathode current (1–100mA). Comparator operation is unaffected whether the reference is used or not - verified in Absolute Maximum Ratings and Electrical Characteristics sections.
What is the maximum sink current per output, and does it vary with supply voltage?
Each open-collector output supports up to 20mA sink current at VO = 1.5V, independent of supply voltage (tested from 5V to 30V). This is specified in the "Isink Output Sink Current" row of the comparator electrical characteristics table (page 3), with no derating required up to VCC = 30V.
Does TSM109AID have ESD protection, and what level is rated?
Yes. The TSM109AID features built-in ESD protection rated at 1.5kV (HBM), as stated in the Absolute Maximum Ratings table (page 2). This meets standard industrial handling requirements but does not replace system-level TVS protection for I/O lines exposed to external connectors.
TSM109AID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- with Voltage Reference
- Number of Elements:
- 2
- Output Type:
- -
- Voltage - Supply, Single/Dual (±):
- 2V ~ 36V, ±1V ~ 18V
- :
- 5mV @ 5V
- Voltage - Input Offset (Max):
- 0.25µA @ 5V
- Current - Input Bias (Max):
- 20mA @ 5V
- Current - Output (Typ):
- 2.5mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 105°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
TSM109AID FAQ
1.How can I place an order for TSM109AID through Aetrix?
Please submit a Request for Quotation (RFQ) for TSM109AID 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 TSM109AID reliable?
The price and inventory of TSM109AID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSM109AID is usually 5 days.
3.What payment methods are accepted for TSM109AID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSM109AID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TSM109AID?
TSM109AID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TSM109AID 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 TSM109AID?
For technical support, including TSM109AID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSM109AID requirements.
6.How does Aetrix verify that TSM109AID is sourced from the original manufacturer or authorized distributors?
All TSM109AID 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 TSM109AID meets industry standards.
7.What is the process for return or replacement of TSM109AID?
All TSM109AID units undergo pre-shipment inspection (PSI). If there is an issue with TSM109AID, 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 TSM109AID part is unused and in its original packaging.
Return procedure for TSM109AID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TSM109AID Tags
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LM2903P
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NCX2200GMAZ
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