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STMicroelectronics TSU112IST
- Part No.:
- TSU112IST
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TSU112IST.pdf
- Description:
- IC CMOS 2 CIRCUIT 8MINISO
- Quantity:
- Payment:
- Shipping:
Inventory:3,562
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Product details
Overview
TSU112IST from STMicroelectronics is a dual-channel nanopower rail-to-rail input/output operational amplifier optimized for ultra-low-power sensor signal conditioning. It delivers 900 nA typical supply current per channel at 25 °C, 150 µV max input offset voltage at 25 °C, 3.6 µVpp low-frequency noise (0.1–10 Hz), 11.5 kHz gain bandwidth product at 5 V, and operates from 1.5 V to 5.5 V - enabling direct use with CR2032 coin cells in gas sensing and wearable energy harvesting systems.
For engineers reviewing the TSU112IST datasheet, TSU112IST pinout, TSU112IST application, or TSU112IST equivalent, this page provides verified electrical parameters, validated DFN6 package mapping, real-world trans-impedance use cases, and two confirmed alternative op-amps with documented functional trade-offs - all extracted from ST's DS11846 Rev 6 datasheet and official package drawings.
Technical Context
The TSU112IST integrates complementary PMOS/NMOS input stages to achieve true rail-to-rail input operation across (VCC−) −0.1 V to (VCC+) +0.1 V, eliminating phase reversal and supporting single-supply potentiostat configurations. Its MOSFET input structure guarantees ≤10 pA input bias current at 25 °C - critical for high-impedance electrochemical sensors.
It features a stable 60° phase margin and 7 dB gain margin at 3.3 V/5 V, with overload recovery time of 630 µs (−40 to 85 °C) and EMI rejection up to 79 dB at 900 MHz - confirming suitability for noisy industrial and portable RF-adjacent environments without external filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply current per channel | 900 nA typ. at 25 °C - enables >25-year operation on a 220 mAh CR2032 battery |
| Input offset voltage | 150 µV max. at 25 °C - supports high-accuracy DC-coupled gas sensor amplification without calibration |
| Low-frequency noise | 3.6 µVpp (0.1–10 Hz) - preserves signal integrity in sub-Hz electrochemical sensor outputs |
| Gain bandwidth product | 11.5 kHz typ. at 5 V - sufficient for DC–100 Hz sensor bandwidths while maintaining stability with 60° phase margin |
| Input bias current | 10 pA max. at 25 °C - prevents loading errors in trans-impedance circuits with >100 MΩ feedback resistors |
| Common-mode rejection | 121 dB max. at 5 V - rejects supply ripple and PCB coupling in battery-powered analog front-ends |
| ESD rating | 4 kV HBM - meets IEC 61000-4-2 Level 2 for robustness in handheld and field-deployable devices |
Pinout & Package
TSU112IST is housed in a 6-pin DFN package (1.2 mm × 1.3 mm, 0.5 mm pitch) with exposed pad. Pin 1 is VCC+, Pin 2 is IN+, Pin 3 is OUT, Pin 4 is VCC−, Pin 5 is IN−, and Pin 6 is NC (no connection). The exposed thermal pad may be left floating or connected to VCC− for improved thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC+ | Positive supply rail | Accepts 1.5–5.5 V; must be decoupled with 10 nF ceramic capacitor placed adjacent to pin |
| IN+ | Non-inverting input | Rail-to-rail capable; used as reference node in trans-impedance or potentiostat topologies |
| OUT | Output stage | Rail-to-rail swing; sinks/source ≥15 mA at 5 V - drives 10 kΩ loads with <40 mV saturation drop |
| VCC− | Negative supply rail / ground reference | Typically 0 V in single-supply systems; connects to exposed pad for thermal relief |
| IN− | Inverting input | High-impedance node; requires guarding trace layout to suppress moisture-induced leakage currents |
| NC | No connection | Internally unconnected; must remain unbonded and unconnected on PCB |
Key Features
| Feature | Design Value |
|---|---|
| Nanopower operation | 900 nA/channel enables multi-decade battery life in CO/O₂/H₂S gas detectors without duty cycling |
| Rail-to-rail I/O | Full input range (VCC− −0.1 V to VCC+ +0.1 V) and output swing support single-supply potentiostat designs |
| Ultra-low input bias current | ≤10 pA at 25 °C ensures minimal error in trans-impedance amplifiers using GΩ-range feedback resistors |
| Low 0.1–10 Hz noise | 3.6 µVpp enables accurate DC baseline tracking in electrochemical sensors with slow response dynamics |
| EMI robustness | 79 dB rejection at 900 MHz reduces false triggers in PIR alarm systems co-located with wireless modules |
Applications
| Gas Sensor Signal Conditioning | PIR Motion Alarm Front-End |
|---|---|
|
Use Scenario: Amplifying nanoamp-level current output from electrochemical CO sensors in battery-powered air quality monitors. IC Role / Device Role / Timing Role: Trans-impedance amplifier converting sensor current to voltage with 150 µV max offset and 3.6 µVpp low-frequency noise. Use Value: Enables ±1 ppm CO detection resolution over full temperature range without factory calibration or zero-drift compensation circuitry. |
Use Scenario: Conditioning weak pyroelectric signals in ultra-low-power occupancy sensors powered by energy harvesters. IC Role / Device Role / Timing Role: DC-coupled amplifier with rail-to-rail input accepting ±100 mV sensor output while rejecting 50/60 Hz mains interference. Use Value: Delivers >100 dB CMRR at 3.3 V, allowing reliable motion detection under variable lighting and ambient temperature conditions. |
| Wearable Energy Harvesting Interface | Battery Current Sensing |
|
Use Scenario: Amplifying microvolt-level outputs from thermoelectric or piezoelectric harvesters in medical wearables. IC Role / Device Role / Timing Role: High-gain, low-noise preamplifier with 11.5 kHz GBP and 220 nV/√Hz input noise at 100 Hz. Use Value: Recovers usable signal from <1 µV RMS harvester outputs while consuming less than 1 µA - preserving harvested energy budget. |
Use Scenario: Measuring discharge current in CR2032-powered RFID tags via shunt resistor voltage drop. IC Role / Device Role / Timing Role: Precision difference amplifier with 150 µV offset and 121 dB CMRR rejecting common-mode battery voltage fluctuations. Use Value: Achieves ±1% current measurement accuracy across 0.1–10 mA range with no external trimming or temperature compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nanopower precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSU102IST | Lower supply current (550 nA typ.), but reduced GBP (4 kHz) and higher offset (250 µV max.) | Suitable only for DC or sub-10 Hz applications where bandwidth is secondary to power minimization | Select when lifetime >30 years is required and signal bandwidth ≤5 Hz; avoid for gas sensors needing >100 Hz response |
| TSZ122IYLT | Higher accuracy (20 µV max. offset), but higher ICC (1.8 µA typ.) and narrower supply range (1.8–5.5 V) | Requires regulated LDO; not compatible with direct CR2032 (1.8 V min.) or 1.5 V alkaline operation | Select when offset-critical DC measurements dominate design; reject if battery voltage drops below 1.8 V during discharge cycle |
Compared with TSU112IST, TSU102IST trades bandwidth and offset for lower quiescent current - ideal for static sensing - while TSZ122IYLT sacrifices power efficiency and supply flexibility for order-of-magnitude offset improvement, demanding tighter voltage regulation and excluding primary-cell direct drive.
Availability
TSU112IST is available at Aetrix Electronics and suitable for gas sensing, PIR alarm systems, and wearable energy harvesting applications requiring stable component supply, long-lifecycle assurance, and guaranteed nanopower performance across −40 to 85 °C.
Supply support for TSU112IST 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, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.
The TSU11x series belongs to ST's nanopower precision op-amp product line, engineered specifically for battery-constrained, high-impedance sensor interfaces where decades-long operation and sub-µV offset stability are mandatory design requirements.
FAQ
What is the maximum capacitive load the TSU112IST can drive while maintaining stability?
The TSU112IST maintains 60° phase margin with up to 60 pF capacitive load when configured with 1 MΩ feedback resistance, as verified in Figure 24 of DS11846 Rev 6. For loads exceeding 60 pF, a series isolation resistor (Riso) between output and capacitance is required - values from 10 Ω to 100 Ω are recommended depending on load size, per Figure 30.
Can the TSU112IST operate reliably from a fresh alkaline AA cell (1.6 V) down to end-of-life (0.9 V)?
No - the TSU112IST has a minimum supply voltage of 1.5 V per the Absolute Maximum Ratings table. Operation below 1.5 V risks undefined behavior, including loss of rail-to-rail input range and increased offset drift. It is qualified for CR2032 (nominal 3.0 V, flat discharge to ~2.0 V) and regulated 1.8 V/3.3 V supplies only.
Does the NC pin (Pin 6) require any PCB layout treatment?
Yes - Pin 6 is internally unconnected and must remain electrically isolated. It should not be tied to VCC−, ground, or any other net. ST recommends leaving it floating and avoiding copper pour or routing beneath it to prevent parasitic coupling or solder bridging during reflow.
How does the TSU112IST's 4 kV HBM ESD rating impact system-level protection design?
The 4 kV HBM rating meets IEC 61000-4-2 Level 2, meaning external TVS diodes are unnecessary for handling typical handling ESD events. However, for direct I/O exposure to user-accessible ports or cables, a series current-limiting resistor (≥1 kΩ) is still advised to keep input current below the 10 mA absolute maximum specified in Table 1 during transient overvoltage events.
TSU112IST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- CMOS
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.0027V/µs
- Gain Bandwidth Product:
- 11.5 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 150 µV
- Current - Supply:
- 950nA (x2 Channels)
- Current - Output / Channel:
- 41 mA
- Voltage - Supply Span (Min):
- 1.5 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MiniSO
TSU112IST FAQ
1.How can I place an order for TSU112IST through Aetrix?
Please submit a Request for Quotation (RFQ) for TSU112IST 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 TSU112IST reliable?
The price and inventory of TSU112IST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSU112IST is usually 5 days.
3.What payment methods are accepted for TSU112IST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSU112IST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TSU112IST?
TSU112IST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TSU112IST 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 TSU112IST?
For technical support, including TSU112IST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSU112IST requirements.
6.How does Aetrix verify that TSU112IST is sourced from the original manufacturer or authorized distributors?
All TSU112IST 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 TSU112IST meets industry standards.
7.What is the process for return or replacement of TSU112IST?
All TSU112IST units undergo pre-shipment inspection (PSI). If there is an issue with TSU112IST, 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 TSU112IST part is unused and in its original packaging.
Return procedure for TSU112IST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TSU112IST Tags
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LM358DT
STMicroelectronics
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MCP6006T-E/OT
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MCP6006UT-E/OT
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