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STMicroelectronics TS3121ICT
- Part No.:
- TS3121ICT
- Manufacturer:
- STMicroelectronics
- Category:
- Comparators
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
TS3121ICT.pdf
- Description:
- RAIL-TO-RAIL, OPEN-DRAIN COMPARA
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
TS3121ICT from STMicroelectronics is a rail-to-rail input, open-drain single comparator with 60 ns propagation delay, 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), -40 °C to +125 °C operation, and AEC-Q100 qualification-enabling precise overcurrent detection in automotive battery management systems.
For engineers reviewing the TS3121ICT datasheet, TS3121ICT pinout, TS3121ICT application, or TS3121ICT equivalent, this device supports high-speed, low-power threshold sensing in space-constrained industrial controllers, automotive subsystems, and power tool motor protection circuits where rail-to-rail input range and output voltage tolerance beyond VCC are required.
Technical Context
The TS3121ICT implements a CMOS input stage with rail-to-rail common-mode range (-0.2 V to VCC+ + 0.2 V) and an open-drain NMOS output capable of sinking up to 140 mA at 5 V while tolerating output voltages exceeding VCC. Its internal hysteresis (1 mV) prevents oscillation during slow-moving input transitions.
It delivers guaranteed start-up time ≤15 µs and operates across full industrial/automotive temperature range with 55–70 dB CMRR and 58–80 dB SVR. Input bias current remains below 200 pA across temperature, enabling high-impedance sensor interfacing without significant error.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation delay | 60 ns typ. at 100 mV overdrive - enables sub-100 ns response for fast fault detection |
| Input offset voltage | ±2 mV max @ 25 °C (A-grade) - ensures <2 mV decision threshold error in precision sensing |
| Supply current | 70 μA typ. - supports always-on monitoring in battery-powered automotive modules |
| Supply voltage range | 1.7 to 5.5 V - interoperable with 1.8 V, 3.3 V, and 5 V logic domains without level shifting |
| Input common-mode range | Rail-to-rail (−0.2 V to VCC+ + 0.2 V) - accepts signals down to ground or above VCC in high-side sensing |
| Output configuration | Open-drain with VOUT tolerance > VCC - allows wired-OR logic and interface to higher-voltage buses |
| Temperature range | −40 °C to +125 °C - qualified for under-hood automotive and industrial motor control environments |
| ESD tolerance | 4 kV HBM - provides robustness against handling and system-level electrostatic discharge events |
Pinout & Package
TS3121ICT 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 in automotive and portable equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Open-drain output | Sinks current when asserted; requires external pull-up; withstands voltage > VCC |
| 2 - VCC− | Negative supply terminal | Reference ground node; supports true single-supply operation with rail-to-rail inputs |
| 3 - IN+ | Non-inverting input | Accepts signals from −0.2 V to VCC+ + 0.2 V; high-impedance (≤200 pA bias) |
| 4 - IN− | Inverting input | Same rail-to-rail range and impedance as IN+; forms differential threshold pair |
| 5 - VCC+ | Positive supply terminal | Accepts 1.7–5.5 V; powers internal circuitry and defines output logic high reference |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Qualified per Grade 1 (−40 °C to +125 °C) - meets automotive reliability and stress test requirements |
| Built-in input hysteresis | 1 mV fixed - eliminates need for external positive feedback resistors in noisy environments |
| Output voltage tolerance | VOUT withstands > VCC - enables direct connection to 12 V or 24 V bus lines for fault signaling |
| Low-input bias current | ≤200 pA max - preserves accuracy when used with megaohm-scale sensor dividers or capacitive sensors |
| Guaranteed start-up time | ≤15 µs after VCC > 1.5 V - ensures deterministic initialization in power sequencing-critical systems |
| High CMRR & SVR | ≥55 dB CMRR, ≥58 dB SVR - rejects supply ripple and common-mode noise in electrically noisy engine bays |
Applications
| Automotive Battery Monitoring | Industrial Motor Overcurrent Protection |
|---|---|
|
Use Scenario: Real-time detection of abnormal current draw in 12 V starter-battery circuits using shunt-based voltage sensing. IC Role / Device Role / Timing Role: Comparator compares amplified shunt voltage against programmable threshold; asserts fault flag within 60 ns. Use Value: Enables immediate shutdown before fuse blow or MOSFET failure, meeting ISO 16750-2 pulse immunity requirements. |
Use Scenario: Monitoring phase current in BLDC motor drives to trigger hardware-level current limiting before thermal damage. IC Role / Device Role / Timing Role: High-speed comparator interfaces with current-sense amplifier to generate immediate enable/disable signal to gate driver. Use Value: Sub-100 ns response reduces I²t energy during short-circuit events, protecting IGBTs and reducing system derating. |
| Power Tool Smart Battery Pack | Programmable Logic Controller (PLC) Input Module |
|
Use Scenario: Cell-level overvoltage and overtemperature detection in lithium-ion battery packs for cordless drills and saws. IC Role / Device Role / Timing Role: Compares analog sensor outputs against reference thresholds; open-drain output feeds microcontroller interrupt line. Use Value: Low 70 μA quiescent current extends standby runtime; rail-to-rail inputs support direct connection to thermistor/divider networks. |
Use Scenario: Converting 0–10 V or 4–20 mA field signals into clean digital logic levels for PLC CPU input processing. IC Role / Device Role / Timing Role: Threshold detector converts analog process signals into TTL/CMOS-compatible digital states with hysteresis. Use Value: 1.7–5.5 V supply flexibility simplifies integration with diverse PLC backplane voltages; −40 °C to +125 °C rating ensures outdoor cabinet operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, low-power comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TS3021ICT | Push-pull output (no external pull-up needed); 40 ns propagation delay; 100 μA ICC | Preferred where board space prohibits pull-up resistor or where faster response is critical | Select TS3021ICT when driving CMOS loads directly or requiring <50 ns timing; avoid if interfacing to higher-voltage buses |
| TS3011ICT | 35 ns propagation delay; 120 μA ICC; same SC70-5 package; no built-in hysteresis | Used in ultra-high-speed window comparators or clock/data recovery where external hysteresis is acceptable | Choose TS3011ICT only when speed outweighs power budget and hysteresis must be externally implemented |
Compared with TS3121ICT, TS3021ICT offers faster switching and simplified output loading but sacrifices VCC-overvoltage tolerance, while TS3011ICT prioritizes raw speed at the cost of higher current and added external component count for noise immunity.
Availability
TS3121ICT is available at Aetrix Electronics and suitable for automotive battery management, industrial motor protection, and power tool smart battery applications requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant performance.
Supply support for TS3121ICT 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, MCU, power, and sensor solutions for automotive, industrial, and consumer markets.
The TS3121 series belongs to ST's precision analog comparators product line, engineered specifically for high-reliability, low-power threshold detection in harsh-temperature automotive and industrial control systems.
FAQ
What is the maximum output sink current for TS3121ICT at 5 V supply?
At VCC = 5 V and T = 25 °C, TS3121ICT guarantees a minimum sink current of 100 mA with VOL ≤ 45 mV at 1 mA load. The absolute maximum rated sink current is 140 mA across the full temperature range (−40 °C to +125 °C), verified per DS14484 Rev 4 electrical characteristics tables.
Does TS3121ICT require external hysteresis components?
No. TS3121ICT integrates 1 mV of internal hysteresis, eliminating the need for external positive feedback resistors. This is confirmed in Table 4 (Electrical Characteristics) and explicitly stated in the "Features" section of DS14484 Rev 4 as a built-in feature defined by trip-point voltage difference.
Can TS3121ICT operate with a 1.8 V supply and still meet AEC-Q100 specifications?
Yes. TS3121ICT is fully specified from 1.7 V to 5.5 V, including all key parameters (propagation delay, offset voltage, supply current) at 1.8 V. Its AEC-Q100 qualification covers the full operating range, with guaranteed −40 °C to +125 °C functionality validated per JEDEC JESD47 and JESD22 standards.
Is the SC70-5 package of TS3121ICT compatible with standard SOT23-5 footprints?
Yes. TS3121ICT uses the industry-standard SC70-5 package (also designated SOT23-5), with identical 0.65 mm lead pitch, 1.25 mm × 2.1 mm body dimensions, and pin 1 marking location. It is mechanically and solder-reflow compatible with standard SOT23-5 land patterns per IPC-7351B.
TS3121ICT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- 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:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- SOT-323-5
TS3121ICT FAQ
1.How can I place an order for TS3121ICT through Aetrix?
Please submit a Request for Quotation (RFQ) for TS3121ICT 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 TS3121ICT reliable?
The price and inventory of TS3121ICT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS3121ICT is usually 5 days.
3.What payment methods are accepted for TS3121ICT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS3121ICT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS3121ICT?
TS3121ICT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS3121ICT 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 TS3121ICT?
For technical support, including TS3121ICT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS3121ICT requirements.
6.How does Aetrix verify that TS3121ICT is sourced from the original manufacturer or authorized distributors?
All TS3121ICT 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 TS3121ICT meets industry standards.
7.What is the process for return or replacement of TS3121ICT?
All TS3121ICT units undergo pre-shipment inspection (PSI). If there is an issue with TS3121ICT, 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 TS3121ICT part is unused and in its original packaging.
Return procedure for TS3121ICT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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