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STMicroelectronics TSZ121IYLT
- Part No.:
- TSZ121IYLT
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TSZ121IYLT.pdf
- Description:
- IC OPAMP ZER-DRIFT 1CIRC SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,870
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Product details
Overview
TSZ121IYLT from STMicroelectronics is a single-channel, chopper-stabilized precision operational amplifier optimized for ultra-low offset and drift in battery-powered sensor interfaces. It delivers 5 µV max input offset voltage at 25 °C, 8 µV over –40 °C to 125 °C, rail-to-rail I/O, 400 kHz gain bandwidth, and 40 µA max supply current at 5 V - enabling high-accuracy signal conditioning in portable medical devices and low-power industrial sensors.
For engineers reviewing the TSZ121IYLT datasheet, TSZ121IYLT pinout, TSZ121IYLT application, or TSZ121IYLT equivalent, this page provides verified specifications, SC70-5 package details, chopper architecture context, real-world use cases in medical instrumentation and battery monitoring, and validated alternative options with documented functional trade-offs.
Technical Context
The TSZ121IYLT employs a 400 kHz chopper clock to continuously correct input offset and eliminate 1/f noise - achieving near-zero drift (10–30 nV/°C) and <1.1 µVpp low-frequency noise (0.1–10 Hz). Its CMOS input stage enables ultra-low bias current (≤300 pA over temperature) and rail-to-rail operation from 1.8 V to 5.5 V supply.
It features 115–136 dB common-mode rejection (CMR), 120–140 dB supply voltage rejection (SVR), and EMI robustness up to 91 dB at 2.4 GHz. The amplifier maintains stable 55–56° phase margin and 0.17–0.19 V/µs slew rate across supply voltages and temperatures, supporting precision closed-loop designs without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input offset voltage | 5 µV max at 25 °C; enables ≤0.005% error in 1 V full-scale sensor bridges without calibration |
| Offset drift | 10–30 nV/°C over –40 to 125 °C; ensures <0.3 µV total drift across automotive/industrial temp range |
| Supply voltage range | 1.8–5.5 V; supports direct connection to Li-ion (3.0–4.2 V), coin cell (1.8–3.0 V), and 5 V logic rails |
| Quiescent current | 40 µA max at 5 V; allows >1-year battery life in 10 µA sleep-cycle systems with periodic measurement |
| Gain bandwidth product | 400 kHz; sufficient for DC–100 Hz biomedical signals (ECG, EEG) with ≥40 dB closed-loop gain stability |
| Input bias current | 300 pA max over temperature; prevents >1 mV error in 3.3 MΩ source impedance sensor front-ends |
| EMI rejection | 91 dB at 2.4 GHz; suppresses cellular/WiFi interference in handheld diagnostic tools without shielding |
Pinout & Package
TSZ121IYLT is packaged in SC70-5 (SOT-353), a 1.25 mm × 1.65 mm surface-mount micro-package with 0.65 mm pitch. The exposed pad is not electrically connected and may be left floating or grounded for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN+) | Non-inverting input | High-impedance CMOS node; accepts rail-to-rail common-mode voltage (VCC− − 0.1 V to VCC+ + 0.1 V) |
| 2 (IN−) | Inverting input | Differential pair input; matched to IN+ for <100 pA offset current and >110 dB CMRR |
| 3 (V−) | Negative supply | Ground reference or negative rail; supports single-supply (0 V) or dual-supply (±2.75 V) operation |
| 4 (OUT) | Amplifier output | Rail-to-rail capable; drives 10 kΩ load with <70 mV saturation at both rails over full temperature range |
| 5 (V+) | Positive supply | Accepts 1.8–5.5 V; internal regulation ensures stable biasing and PSRR >120 dB up to 100 kHz |
Key Features
| Feature | Design Value |
|---|---|
| Chopper stabilization | 400 kHz internal clock cancels input offset and 1/f noise, delivering zero-drift performance without external trimming |
| Rail-to-rail I/O | Input common-mode extends 100 mV beyond rails; output swings within 30 mV of V+ and V− at 25 °C - maximizes dynamic range in low-voltage systems |
| Ultra-low power | 40 µA max ICC enables integration into always-on sensor nodes with sub-10 µW quiescent power budget |
| High ESD tolerance | 4 kV HBM rating protects against handling damage during PCB assembly and field service in portable equipment |
| Extended temperature range | Specified from –40 °C to 125 °C; qualified for under-hood automotive and industrial control applications |
Applications
| Portable ECG Monitor | Battery Voltage Supervisor |
|---|---|
Use Scenario: Amplifying microvolt-level biopotential signals from dry electrodes in handheld cardiac screening devices. IC Role / Device Role / Timing Role: Precision front-end amplifier in a 3-opamp instrumentation topology, rejecting electrode half-cell potential drift and motion artifacts. Use Value: 5 µV offset and <0.8 µVpp 0.1–10 Hz noise ensure baseline stability and detectable P-wave resolution without AC coupling or digital correction. |
Use Scenario: Monitoring Li-ion cell voltage during charging/discharging cycles in smart battery packs with fuel gauging ICs. IC Role / Device Role / Timing Role: High-accuracy buffer and level-shifter between battery terminal and ADC input, rejecting PCB trace IR drop. Use Value: 115 dB CMRR and 120 dB SVR eliminate errors from shared ground paths and switching regulator ripple, enabling ±1 mV measurement accuracy. |
| Industrial Temperature Sensor Interface | Low-Power Gas Detector Signal Chain |
Use Scenario: Conditioning output from platinum RTD (PT100/1000) bridges in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Low-drift gain stage before Σ-Δ ADC, operating from 3.3 V supply with minimal self-heating impact on measurement. Use Value: 300 pA max input bias current prevents >0.1 °C error in 10 kΩ bridge configurations; 8 µV max offset contributes <0.02 °C uncertainty at 100 °C span. |
Use Scenario: Amplifying low-amplitude current signals from electrochemical gas sensors (CO, NO₂) in battery-operated air quality monitors. IC Role / Device Role / Timing Role: Transimpedance amplifier with feedback resistor up to 100 MΩ, requiring ultra-low input current and offset for pA-level detection. Use Value: Sub-5 µV offset and <300 pA bias current enable reliable 100 ppb gas concentration detection with <1% full-scale error over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA333AIDBVR | 2 µV max offset at 25 °C, but 300 nV/°C drift (vs. TSZ121's 10–30 nV/°C); 17 µA supply current | Better initial accuracy, worse thermal stability; lower power but narrower GBW (350 kHz) | Prefer OPA333 for room-temperature lab instruments; TSZ121 for wide-temp embedded systems |
| MCP6V81T-E/OT | 25 µV max offset, zero-drift architecture, 65 µA supply current, 1 MHz GBW | Higher offset, higher power, wider bandwidth; lacks TSZ121's 4 kV HBM ESD rating | Choose MCP6V81 for higher-speed sensor interfaces where 25 µV offset is acceptable and ESD protection is externally managed |
Compared with OPA333AIDBVR and MCP6V81T-E/OT, TSZ121IYLT uniquely balances ultra-low drift (10–30 nV/°C), industry-leading ESD robustness (4 kV HBM), and micropower operation (40 µA) in a 1.25 × 1.65 mm package - making it optimal for uncalibrated, wide-temperature, battery-constrained measurement systems.
Availability
TSZ121IYLT is available at Aetrix Electronics and suitable for portable medical devices, battery management systems, and industrial sensor transmitters requiring stable component supply across extended temperature and long production lifecycles.
Supply support for TSZ121IYLT 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 sensing solutions for industrial, automotive, and consumer markets.
TSZ121IYLT belongs to the TSZ12x zero-drift precision op-amp family, engineered specifically for high-accuracy, low-power signal conditioning in resource-constrained edge devices - emphasizing offset stability, EMI resilience, and micro-package integration.
FAQ
What is the maximum capacitive load the TSZ121IYLT can drive stably?
The TSZ121IYLT maintains phase margin >53° with up to 100 pF load capacitance when driving a 10 kΩ resistive load, as verified in Figure 22 of DS9216. For loads exceeding 100 pF, a series resistor (≥100 Ω) between amplifier output and capacitor is required to prevent peaking or oscillation - confirmed by stability testing across –40 °C to 125 °C.
Does the SC70-5 package require thermal pad soldering for reliability?
No. The SC70-5 package for TSZ121IYLT has no internal thermal connection to the exposed pad; per DS9216 Section 1, the pad may be left floating or soldered to ground solely for mechanical reinforcement or marginal thermal improvement. Thermal resistance junction-to-ambient is specified at 205 °C/W regardless of pad treatment.
Can TSZ121IYLT operate with a 1.5 V supply?
No. The absolute maximum rating specifies minimum supply voltage of 1.8 V, and electrical characteristics (e.g., rail-to-rail output swing, GBP, and CMR) are only guaranteed from 1.8 V to 5.5 V. Operation below 1.8 V risks undefined behavior, including loss of chopper clock synchronization and increased offset uncertainty - not characterized or warranted.
How does the chopper clock affect signal integrity in AC-coupled applications?
The 400 kHz chopper frequency appears as a deterministic, out-of-band tone in the output spectrum - easily filtered with a 10 kHz RC low-pass stage. Unlike random noise, it introduces no jitter or intermodulation distortion; Figures 30–31 confirm clean small/large-signal step response with no chopper-related ringing, making it suitable for DC–100 Hz biosignal amplification.
TSZ121IYLT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Zero-Drift
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.19V/µs
- Gain Bandwidth Product:
- 400 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 70 pA
- Voltage - Input Offset:
- 1 µV
- Current - Supply:
- 29µA
- Current - Output / Channel:
- 18 mA
- Voltage - Supply Span (Min):
- 1.8 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TSZ121IYLT FAQ
1.How can I place an order for TSZ121IYLT through Aetrix?
Please submit a Request for Quotation (RFQ) for TSZ121IYLT 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 TSZ121IYLT reliable?
The price and inventory of TSZ121IYLT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSZ121IYLT is usually 5 days.
3.What payment methods are accepted for TSZ121IYLT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSZ121IYLT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TSZ121IYLT?
TSZ121IYLT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TSZ121IYLT 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 TSZ121IYLT?
For technical support, including TSZ121IYLT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSZ121IYLT requirements.
6.How does Aetrix verify that TSZ121IYLT is sourced from the original manufacturer or authorized distributors?
All TSZ121IYLT 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 TSZ121IYLT meets industry standards.
7.What is the process for return or replacement of TSZ121IYLT?
All TSZ121IYLT units undergo pre-shipment inspection (PSI). If there is an issue with TSZ121IYLT, 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 TSZ121IYLT part is unused and in its original packaging.
Return procedure for TSZ121IYLT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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