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STMicroelectronics TS3121IYLT
- Part No.:
- TS3121IYLT
- Manufacturer:
- STMicroelectronics
- Category:
- Comparators
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TS3121IYLT.pdf
- Description:
- RAIL-TO-RAIL, OPEN-DRAIN COMPARA
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
TS3121IYLT from STMicroelectronics is a rail-to-rail input, open-drain single comparator with 60 ns propagation delay (typ.), 2 mV max offset voltage (A-grade), 70 μA typical supply current, and operation from 1.7 to 5.5 V. It features built-in hysteresis (1 mV), power-on reset capability (in P-version), and AEC-Q100 qualification for automotive use in overcurrent protection circuits.
For engineers reviewing the TS3121IYLT datasheet, TS3121IYLT pinout, TS3121IYLT application, or TS3121IYLT equivalent, this device supports high-speed, low-power sensing in space-constrained industrial and automotive systems requiring guaranteed start-up time, extended temperature operation (–40 °C to +125 °C), and output voltage tolerance beyond VCC.
Technical Context
The TS3121IYLT implements a precision comparator architecture with rail-to-rail input common-mode range (–0.2 V to VCC+ + 0.2 V) and open-drain output capable of sinking up to 140 mA at 5 V. Its internal hysteresis (1 mV) eliminates oscillation near threshold without external components.
It operates across 1.7–5.5 V supply and delivers stable performance over –40 °C to +125 °C, with input bias current as low as 5 pA (typ.) and CMRR of 70 dB (min.). The device guarantees ≤15 µs start-up time and exhibits <20 µV/°C input offset drift.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation delay | 60 ns typ. at 5 V, enabling fast response in overcurrent detection and fault monitoring loops |
| Input offset voltage | 2 mV max @ 25 °C (A-grade), ensuring accurate threshold detection in precision sensing |
| Supply current | 70 μA typ., supporting battery-powered and ultra-low-power applications |
| Supply voltage range | 1.7 to 5.5 V, compatible with Li-ion, 3.3 V, and 5 V system rails |
| Operating temperature | –40 °C to +125 °C, qualified for under-hood automotive and industrial environments |
| Input hysteresis | 1 mV built-in, eliminating need for external feedback resistors in noisy environments |
| ESD tolerance | 4 kV HBM, enhancing robustness during board handling and system integration |
Pinout & Package
TS3121IYLT is housed in a SC70-5 (SOT23-5) package - a 1.25 mm × 2.1 mm surface-mount outline with 0.65 mm pitch, optimized for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Open-drain output | Sinks current only; requires external pull-up for logic-high; withstands voltages > VCC |
| 2 (VCC–) | Negative supply terminal | Reference ground for dual-supply operation; supports single-supply use when tied to GND |
| 3 (IN+) | Non-inverting input | Rail-to-rail capable; accepts signals from –0.2 V to VCC+ + 0.2 V |
| 4 (IN–) | Inverting input | Rail-to-rail capable; differential input voltage range ±0.3 V relative to VCC– |
| 5 (VCC+) | Positive supply terminal | Accepts 1.7–5.5 V; powers internal circuitry and defines output swing reference |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Grade 1 (–40 °C to +125 °C), certified for automotive powertrain and body electronics |
| Rail-to-rail input | Common-mode range extends 0.2 V beyond supply rails, maximizing dynamic range in low-voltage systems |
| Open-drain output with over-VCC tolerance | Output pin safely interfaces with higher-voltage buses (up to 6 V) without level-shifting |
| Guaranteed start-up time | ≤15 µs after VCC exceeds 1.5 V, ensuring deterministic behavior in power sequencing |
| High ESD immunity | 4 kV HBM rating reduces risk of field failure during assembly and operation |
Applications
| Overcurrent Protection | Automotive Battery Monitoring |
|---|---|
|
Use Scenario: Real-time detection of excessive current in motor drivers or DC-DC converters. IC Role / Device Role / Timing Role: Comparator compares shunt voltage against reference; triggers shutdown within 60 ns. Use Value: Prevents MOSFET destruction by responding faster than thermal limits allow. |
Use Scenario: Monitoring battery cell voltage imbalance in 12 V automotive systems. IC Role / Device Role / Timing Role: Compares cell voltage to threshold; drives LED or MCU interrupt on deviation. Use Value: Enables early fault detection with rail-to-rail input compatibility down to 1.7 V supply. |
| Industrial Power Tool Control | Smart Sensor Interface |
|
Use Scenario: Stall detection in cordless drill motor control using back-EMF sensing. IC Role / Device Role / Timing Role: Detects zero-crossing or amplitude drop in motor phase signal. Use Value: Low 70 μA quiescent current extends runtime; 125 °C rating survives tool housing heat. |
Use Scenario: Threshold-triggered wake-up for ultra-low-power environmental sensors. IC Role / Device Role / Timing Role: Compares analog sensor output to programmable reference; asserts interrupt on event. Use Value: Built-in 1 mV hysteresis prevents chatter; open-drain output simplifies MCU interface. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TS3021ILT | Push-pull output (no external pull-up required); 40 ns propagation delay; 100 μA ICC | Better for driving capacitive loads directly; unsuitable where wired-OR or level-shifting is needed | Select when output drive strength and speed outweigh open-drain flexibility |
| TS3011ILT | Higher speed (25 ns typ.); 120 μA ICC; same SC70-5 package; no built-in hysteresis | Requires external hysteresis resistor network; less suitable for noisy industrial environments | Select when sub-30 ns response is mandatory and board area allows external components |
Compared with TS3121IYLT, TS3021ILT offers faster push-pull switching but sacrifices over-VCC output tolerance, while TS3011ILT achieves greater speed at the cost of design complexity and higher power-making TS3121IYLT optimal for robust, low-power, space-constrained sensing.
Availability
TS3121IYLT is available at Aetrix Electronics and suitable for automotive battery management, industrial overcurrent protection, and smart sensor interface applications requiring stable component supply across extended temperature and long product lifecycles.
Supply support for TS3121IYLT 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 specializing in automotive, industrial, and power management solutions, with broad analog and mixed-signal portfolio coverage.
The TS3121 series belongs to ST's precision analog comparators product line, designed specifically for high-reliability, low-power sensing in harsh environments where AEC-Q100 compliance and guaranteed timing behavior are critical.
FAQ
What is the maximum output sink current for TS3121IYLT at 3.3 V supply?
At VCC = 3.3 V and T = 25 °C, the TS3121IYLT guarantees a minimum sink current of 45 mA (typ. 35 mA, max. 70 mA) with VOL ≤ 50 mV at 1 mA load. This enables direct driving of LEDs, optocouplers, or logic inputs without external buffers.
Does TS3121IYLT include internal hysteresis, and how is it implemented?
Yes, TS3121IYLT integrates 1 mV of internal hysteresis, defined as the voltage difference between rising and falling input thresholds. It is implemented via internal positive feedback and requires no external components-reducing PCB area and improving noise immunity in motor control or power supply monitoring.
Can TS3121IYLT operate with a single 1.8 V supply?
Yes, TS3121IYLT is fully specified down to 1.7 V supply. At 1.8 V, it maintains 60 ns propagation delay (typ.), 78–81 μA supply current, and rail-to-rail input operation with VICM from –0.2 V to 2.0 V-making it suitable for modern ultra-low-voltage IoT and portable systems.
How does the TS3121IYLT differ from the TS3121P version?
The TS3121IYLT corresponds to the standard TS3121 (or TS3121A) variant without Power-on Reset (PoR). The TS3121P adds an embedded PoR circuit that forces the output low during power ramp-up until VCC stabilizes above 1.5 V-critical for fail-safe startup in safety-critical automotive modules.
TS3121IYLT 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, Rail-to-Rail
- Voltage - Supply, Single/Dual (±):
- 1.7V ~ 5V
- :
- 6mV @ 5V
- Voltage - Input Offset (Max):
- 50pA @ 5V
- Current - Input Bias (Max):
- 140mA @ 5V
- Current - Output (Typ):
- 125µA
- Current - Quiescent (Max):
- 70dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- 135ns
- Propagation Delay (Max):
- 1mV
- Hysteresis:
- -40°C ~ 125°C
- Operating Temperature:
- Automotive
- Grade:
- AEC-Q100
- Qualification:
- Surface Mount
- :
- SOT-23-5
TS3121IYLT FAQ
1.How can I place an order for TS3121IYLT through Aetrix?
Please submit a Request for Quotation (RFQ) for TS3121IYLT 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 TS3121IYLT reliable?
The price and inventory of TS3121IYLT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS3121IYLT is usually 5 days.
3.What payment methods are accepted for TS3121IYLT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS3121IYLT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS3121IYLT?
TS3121IYLT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS3121IYLT 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 TS3121IYLT?
For technical support, including TS3121IYLT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS3121IYLT requirements.
6.How does Aetrix verify that TS3121IYLT is sourced from the original manufacturer or authorized distributors?
All TS3121IYLT 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 TS3121IYLT meets industry standards.
7.What is the process for return or replacement of TS3121IYLT?
All TS3121IYLT units undergo pre-shipment inspection (PSI). If there is an issue with TS3121IYLT, 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 TS3121IYLT part is unused and in its original packaging.
Return procedure for TS3121IYLT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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