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STMicroelectronics TSU102IST
- Part No.:
- TSU102IST
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TSU102IST.pdf
- Description:
- IC CMOS 2 CIRCUIT 8MINISO
- Quantity:
- Payment:
- Shipping:
Inventory:6,293
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Product details
Overview
TSU102IST from STMicroelectronics is a dual-channel nanopower rail-to-rail input/output operational amplifier optimized for ultra-low-power sensor signal conditioning. It delivers 580 nA typical supply current per channel at 1.8 V, 8 kHz gain bandwidth, 2 pA max input bias current at 25 °C, and operates across 1.5 V to 5.5 V supply with –40 °C to 85 °C industrial temperature range - enabling multi-year operation from a 220 mAh coin-cell battery in PIR motion detectors.
For engineers reviewing the TSU102IST datasheet, TSU102IST pinout, TSU102IST application, or TSU102IST equivalent, key selection considerations include its validated rail-to-rail I/O performance at sub-2 V supply, guaranteed phase-reversal-free operation, low-frequency noise (8.6 µVpp, 0.1–10 Hz), and channel separation >100 dB at 1 kHz - critical for dual-sensor differential measurement in electrochemical gas sensors and medical wearable front-ends.
Technical Context
The TSU102IST implements a complementary PMOS/NMOS input stage enabling true rail-to-rail common-mode input range (VCC− −0.1 V to VCC+ +0.1 V) without phase reversal. Its 8 kHz GBP is stabilized for unity-gain configuration with ≤60 pF capacitive load, supported by 60° phase margin and 10–12 dB gain margin across 1.8–5 V supplies.
It features dual independent amplifiers in a single die with measured channel separation >100 dB at 1 kHz (VCC = 5 V), enabling simultaneous high-accuracy conditioning of two high-impedance sensor outputs - such as UV photodiode and reference thermistor - without crosstalk-induced offset drift.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 580 nA typ. per channel at 1.8 V - enables >42-year coin-cell lifetime in always-on sensor nodes |
| Gain Bandwidth Product | 8 kHz typ. - sufficient for DC–100 Hz biosignal and environmental sensor conditioning |
| Input Bias Current | 2 pA max at 25 °C - preserves accuracy with >1 GΩ source impedances (e.g., pH electrodes) |
| Input Offset Voltage | ±3.4 mV over –40 °C to 85 °C - supports <0.1% full-scale error in 12-bit ADC interfaces |
| CMRR | 70 dB min. at 0–3.3 V common-mode range - rejects power-supply ripple in battery-powered meters |
| Output Drive | ±4 mA min. sink/source - drives 100 kΩ loads to rail within 40 mV at 3.3 V supply |
| EMI Rejection | 88 dB at 900 MHz - maintains stability near GSM/ISM-band transceivers in portable devices |
Pinout & Package
TSU102IST is housed in an 8-pin DFN package (2 mm × 2 mm, 0.4 mm pitch) with wettable flanks, optimized for space-constrained PCBs and automated optical inspection. Pin 1 is marked by a dot; exposed thermal pad is connected to VCC− for enhanced thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT1) | Channel 1 output | Rail-to-rail voltage source/sink; drives ADC input or filter network directly |
| 2 (IN1−) | Channel 1 inverting input | High-impedance node; connects to feedback resistor in transimpedance or difference amp |
| 3 (IN1+) | Channel 1 non-inverting input | Accepts sensor voltage up to VCC+ +0.1 V; enables single-supply high-side sensing |
| 4 (VCC−) | Negative supply / ground reference | Return path for both channels; ties to PCB ground plane and thermal pad |
| 5 (VCC+) | Positive supply | Accepts 1.5–5.5 V; decoupling capacitor required within 2 mm for stability |
| 6 (OUT2) | Channel 2 output | Independent output; supports dual-path signal chain (e.g., active filter + buffer) |
| 7 (IN2−) | Channel 2 inverting input | Electrically isolated from IN1−; enables matched dual feedback networks |
| 8 (IN2+) | Channel 2 non-inverting input | Full rail-to-rail common-mode range; used for reference voltage buffering or sensor duplication |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O | Input extends 0.1 V beyond rails; output swings within 40 mV of VCC+/VCC− - eliminates level-shifting in 1.8 V systems |
| Phase-reversal immunity | Guaranteed no output inversion during input overdrive - prevents latch-up in pyroelectric sensor interfaces |
| Low-frequency noise | 8.6 µVpp (0.1–10 Hz) - enables stable DC-coupled amplification of slow-varying gas sensor outputs |
| Long-term Vio drift | 0.36 µV/√month at 3.3 V - ensures <1 µV total drift over 5 years, critical for uncalibrated medical monitors |
| Unity-gain stability | Stable with 60 pF load and no external compensation - simplifies layout in compact wearable PCBs |
Applications
| UV and Photo Sensors | Electrochemical Gas Sensors |
|---|---|
Use Scenario: Amplifying photocurrent from UV-C photodiodes in portable sterilization dosimeters. IC Role / Device Role / Timing Role: Transimpedance amplifier converting 10 pA–1 nA photocurrent to 0.1–100 mV output with <10 µV offset error. Use Value: 2 pA input bias current prevents signal loss across >1 GΩ feedback resistors; 8.6 µVpp noise avoids false UV exposure alarms. | Use Scenario: Conditioning current output from CO electrochemical cells in handheld air quality analyzers. IC Role / Device Role / Timing Role: Low-drift, low-noise current-to-voltage converter operating continuously on CR2032 battery. Use Value: 580 nA supply current extends battery life to >5 years; rail-to-rail I/O accommodates varying cell voltage (0.2–0.8 V). |
| Pyroelectric PIR Detection | Battery Current Sensing |
Use Scenario: Front-end amplifier for dual-element PIR sensors in smart occupancy switches. IC Role / Device Role / Timing Role: Dual-channel AC-coupled amplifier with matched gain paths for differential motion detection. Use Value: >100 dB channel separation prevents crosstalk between sensing elements; 8 kHz GBP supports 0.1–10 Hz human motion band. | Use Scenario: High-side current sensing in lithium-ion battery protection ICs for wearables. IC Role / Device Role / Timing Role: Precision difference amplifier measuring µV-level shunt voltage under 1.8 V supply. Use Value: ±3.4 mV max Vio ensures <1% error at 100 µA sense current; 70 dB CMRR rejects battery voltage transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nanopower op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSU112IDT | Lower Vio (±150 µV max), higher ICC (1.1 µA), same 8 kHz GBP | Better DC accuracy but 2× higher current - trades battery life for precision in calibrated instruments | Select when long-term Vio drift <0.5 µV/√month is required and supply allows >1 µA/channel |
| LTC1540CMS8#PBF | Higher Vio (±3 mV), lower GBP (4 kHz), 600 nA ICC, SO-8 package | Less suitable for fast transient PIR signals; larger footprint limits wearable integration | Choose only if legacy SO-8 assembly infrastructure exists and 4 kHz bandwidth suffices |
Compared with TSU102IST, TSU112IDT improves DC accuracy at the cost of 90% higher quiescent current, while LTC1540CMS8 offers pin-compatible SO-8 packaging but halves bandwidth and lacks rail-to-rail input - making TSU102IST optimal for space-constrained, multi-year battery applications demanding balanced speed, noise, and power.
Availability
TSU102IST is available at Aetrix Electronics and suitable for ultra-low-power sensor nodes, portable medical diagnostics, and battery-operated environmental monitors requiring stable component supply across extended product lifecycles.
Supply support for TSU102IST 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, specializing in microcontrollers, power management, analog, and MEMS technologies for industrial, automotive, and consumer markets.
The TSU10x series belongs to ST's nanopower precision op amp product line, designed specifically for energy-harvesting and coin-cell-powered applications where microampere-level current budget and rail-to-rail operation at sub-2 V are mandatory.
FAQ
What is the maximum capacitive load the TSU102IST can drive without oscillation?
The TSU102IST remains stable with up to 60 pF capacitive load in unity-gain configuration, as verified by 60° phase margin and <10% overshoot in step-response testing. For loads >60 pF, a series isolation resistor (Riso ≥1 kΩ) is required between output and capacitance to maintain stability - per Figure 31 in DS9507 Rev 4.
Does the TSU102IST support true single-supply operation down to 1.5 V?
Yes - the TSU102IST operates fully specified from 1.5 V to 5.5 V, with rail-to-rail input extending to VCC− −0.1 V and VCC+ +0.1 V, and output swing within 40 mV of both rails at 1.5 V supply. Electrical characteristics including GBP, Vio, and Iib are guaranteed across this range per Tables 2–5 in DS9507 Rev 4.
How is channel separation measured on the TSU102IST, and what is its practical impact?
Channel separation is measured per Figure 36: one channel driven with 2 Vpp sine wave at 1 kHz while the other channel's output is monitored; >100 dB rejection is confirmed at 1 kHz (VCC = 5 V). This prevents crosstalk-induced offset shifts when amplifying two high-impedance sensors (e.g., O₂ and CO gas cells) sharing a common reference plane.
Can the TSU102IST be used in a transimpedance configuration with >1 GΩ feedback resistance?
Yes - its 2 pA max input bias current at 25 °C and rail-to-rail input enable stable TIA operation with 1–10 GΩ feedback resistors. Layout best practices include guarding the IN+ and IN− traces, using low-leakage PCB materials (e.g., FR4 with solder mask removed), and avoiding contamination - all validated in ST's AN5027 application note.
TSU102IST 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:
- 0.003V/µs
- Gain Bandwidth Product:
- 9 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 650nA (x2 Channels)
- Current - Output / Channel:
- 11 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
TSU102IST FAQ
1.How can I place an order for TSU102IST through Aetrix?
Please submit a Request for Quotation (RFQ) for TSU102IST 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 TSU102IST reliable?
The price and inventory of TSU102IST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSU102IST is usually 5 days.
3.What payment methods are accepted for TSU102IST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSU102IST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TSU102IST?
TSU102IST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TSU102IST 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 TSU102IST?
For technical support, including TSU102IST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSU102IST requirements.
6.How does Aetrix verify that TSU102IST is sourced from the original manufacturer or authorized distributors?
All TSU102IST 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 TSU102IST meets industry standards.
7.What is the process for return or replacement of TSU102IST?
All TSU102IST units undergo pre-shipment inspection (PSI). If there is an issue with TSU102IST, 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 TSU102IST part is unused and in its original packaging.
Return procedure for TSU102IST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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