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STMicroelectronics TS321ILT
- Part No.:
- TS321ILT
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TS321ILT.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:49,148
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Product details
Overview
TS321ILT from STMicroelectronics is a low-power, single bipolar operational amplifier in SOT23-5 package, designed for cost-sensitive space-constrained applications. It delivers 500 µA supply current, 2 mV (TS321A) or 4 mV (TS321) max input offset voltage, and rail-to-rail output swing from 0 to 3.5 V at 5 V supply - enabling use in single-supply sensor signal conditioning and portable battery-powered systems.
For engineers reviewing the TS321ILT datasheet, TS321ILT pinout, TS321ILT application, or TS321ILT equivalent, key selection criteria include input bias current (20 nA), common-mode input range extending to ground, stability with capacitive loads, and compatibility with 3–30 V single or ±1.5–±15 V dual supplies.
Technical Context
The TS321ILT uses a bipolar input stage with PNP differential pair, enabling rail-to-rail input common-mode range down to ground and supporting true single-supply operation. Its internal compensation ensures unity-gain stability even with ≥100 pF capacitive loads at the output.
It features a 0.8 MHz gain-bandwidth product and 0.4 V/µs slew rate, optimized for DC-coupled amplification and low-frequency signal conditioning rather than high-speed AC applications. Phase margin is fixed at 60°, confirming robust small-signal stability across temperature and supply variations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 500 µA typical at 5 V - enables multi-year battery life in always-on sensor nodes |
| Input Offset Voltage | 4 mV max (TS321) / 2 mV max (TS321A) - sets baseline DC error in precision gain stages |
| Input Bias Current | 20 nA typical - minimizes voltage drop across high-impedance source networks (e.g., thermistors) |
| Output Swing | 0 to 3.5 V min at VCC = 5 V - supports full dynamic range into ADCs with 3.3 V reference |
| GBW Product | 0.8 MHz - sufficient for <10 kHz closed-loop bandwidth with gain ≤80 |
| CMRR | 65 dB min - rejects common-mode noise in industrial analog front-ends |
| SR | 0.4 V/µs - limits maximum undistorted sine frequency to ~64 kHz at 10 Vpp |
Pinout & Package
SOT23-5 plastic surface-mount package (ECOPACK® compliant), 2.9 mm × 2.8 mm footprint, 1.2 mm height, thermal resistance RthJA = 250 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (−) | Differential input node; accepts signals referenced to ground or virtual ground |
| 2 | Non-inverting Input (+) | Differential input node; supports rail-to-rail common-mode range including ground |
| 3 | Output | Class-AB output stage capable of sourcing 20 mA and sinking 10 mA at 15 V supply |
| 4 | VCC+ | Positive supply terminal; operates from 3 to 30 V single or ±1.5 to ±15 V dual |
| 5 | VCC− | Negative supply or ground reference; required for dual-supply operation or biasing |
Key Features
| Feature | Design Value |
|---|---|
| Low power consumption | 500 µA supply current enables integration into energy-harvesting and ultra-low-power IoT nodes |
| Rail-to-rail input common-mode range | VICM includes ground, eliminating need for level-shifting in single-supply sensor interfaces |
| Capacitive load stability | Stable with ≥100 pF output capacitance - simplifies anti-aliasing filter design without external isolation resistors |
| Wide supply voltage range | 3–30 V single or ±1.5–±15 V dual - supports legacy 24 V industrial rails and modern 3.3 V microcontroller domains |
| ESD robustness | 500 V HBM rating - improves manufacturing yield and field reliability in unshielded environments |
Applications
| Temperature Sensor Interface | Portable Battery Monitor |
|---|---|
|
Use Scenario: Amplifying low-level output from NTC thermistors or RTDs in HVAC controllers and medical devices. IC Role / Device Role / Timing Role: Single-supply non-inverting amplifier with gain ≥10, referenced to ground. Use Value: Input bias current ≤20 nA prevents significant self-heating error in high-resistance sensor bridges. |
Use Scenario: Monitoring cell voltage in 2–4S Li-ion battery packs for wearables and power tools. IC Role / Device Role / Timing Role: Precision buffer and level-shifter between battery divider and 12-bit SAR ADC. Use Value: 4 mV max input offset ensures ≤0.1% full-scale error in 4.2 V measurement range. |
| Industrial 4–20 mA Transmitter | Low-Power Analog Front-End |
|
Use Scenario: Driving current loop with voltage-controlled current source in process automation transmitters. IC Role / Device Role / Timing Role: Output-stage amplifier in Howland current source configuration. Use Value: Output sink capability ≥10 mA at 0.2 V ensures compliance with 250 Ω shunt drop under low-voltage conditions. |
Use Scenario: Signal conditioning for piezoelectric vibration sensors in predictive maintenance edge nodes. IC Role / Device Role / Timing Role: AC-coupled inverting amplifier with selectable gain and high-pass filtering. Use Value: 0.8 MHz GBW supports >10 kHz bandwidth while maintaining SNR with 40 nV/√Hz input noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar single low-power op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM321DR | Higher supply current (800 µA typ), wider offset voltage spread (7 mV max), no A-grade variant | Lacks TS321A's 2 mV offset option; less suitable for precision DC gain stages | Prefer TS321ILT where <3 mV offset and sub-600 µA current are mandatory |
| MCP6001T-I/OT | CMOS input (1 pA bias), lower offset drift, but only 1.8–6 V supply range and 0.6 V output headroom | Cannot operate from 24 V rails or drive near-ground outputs - incompatible with industrial analog inputs | Choose MCP6001T-I/OT only for 3.3 V battery systems requiring femtoampere input leakage |
Compared with LM321DR and MCP6001T-I/OT, TS321ILT uniquely balances ultra-low quiescent current, ground-sensing input, wide supply range, and bipolar precision - making it optimal for industrial sensor nodes needing long life and 24 V compatibility.
Availability
TS321ILT is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable battery monitoring, 4–20 mA transmitter circuits, and low-power analog front-ends requiring stable component supply across extended temperature ranges (−40 °C to +125 °C).
Supply support for TS321ILT 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, specializing in automotive, industrial, and power management ICs with strong analog and mixed-signal IP.
The TS321 series belongs to ST's general-purpose operational amplifier portfolio, engineered for cost-effective, space-efficient analog signal conditioning in harsh-environment applications demanding wide supply range and ground-referenced operation.
FAQ
Is TS321ILT pin-compatible with LM321?
Yes - TS321ILT uses the same SOT23-5 pinout as LM321DR/LM321DBVR: Pin 1 = Inverting Input, Pin 2 = Non-inverting Input, Pin 3 = Output, Pin 4 = V+, Pin 5 = V−. No PCB redesign is needed for drop-in replacement in existing layouts.
Can TS321ILT operate from a 3.3 V supply?
Yes - its specified single-supply range starts at 3 V. At 3.3 V, output swing is guaranteed ≥0 to 2.8 V (typical), and input common-mode range extends from ground to ≥1.8 V, supporting direct interfacing with 3.3 V microcontrollers and ADCs.
What is the maximum capacitive load TS321ILT can drive stably?
TS321ILT is characterized for stable operation with ≥100 pF capacitive loads at unity gain, per Figure 3 and macromodel validation. For loads >200 pF, adding a 10–50 Ω series resistor between output and capacitor restores phase margin without degrading DC accuracy.
Does TS321ILT have ESD protection on all pins?
Yes - per Table 1, it features 500 V HBM, 200 V MM, and 1000 V CDM ESD ratings on all five pins. This exceeds JEDEC JS-001 Class 2 requirements and ensures robustness during automated assembly and field deployment.
TS321ILT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 0.4V/µs
- Gain Bandwidth Product:
- 800 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 20 nA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 600µA
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TS321ILT FAQ
1.How can I place an order for TS321ILT through Aetrix?
Please submit a Request for Quotation (RFQ) for TS321ILT 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 TS321ILT reliable?
The price and inventory of TS321ILT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS321ILT is usually 5 days.
3.What payment methods are accepted for TS321ILT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS321ILT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS321ILT?
TS321ILT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS321ILT 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 TS321ILT?
For technical support, including TS321ILT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS321ILT requirements.
6.How does Aetrix verify that TS321ILT is sourced from the original manufacturer or authorized distributors?
All TS321ILT 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 TS321ILT meets industry standards.
7.What is the process for return or replacement of TS321ILT?
All TS321ILT units undergo pre-shipment inspection (PSI). If there is an issue with TS321ILT, 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 TS321ILT part is unused and in its original packaging.
Return procedure for TS321ILT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TS321ILT Tags
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LM358DT
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