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Home > Products > Integrated Circuits (ICs) > Linear > Instrumentation, Op Amps, Buffer Amps

STMicroelectronics TSZ121ICT

Name: TSZ121ICT
Brand: STMicroelectronics
SKU: TSZ121ICT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TSZ121ICT

Manufacturer:: STMicroelectronics

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 5-TSSOP, SC-70-5, SOT-353

Datasheet:: TSZ121ICT.pdf

Description:: IC OPAMP ZERO-DRIFT 1CIRC SC70-5

Quantity:: RFQ Add To RFQ list

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Product details

Overview

TSZ121ICT from STMicroelectronics is a single-channel, chopper-stabilized precision operational amplifier optimized for ultra-low offset voltage (5 µV max at 25 °C, 8 µV over −40 °C to +125 °C), rail-to-rail input/output operation, and micropower consumption (40 µA max at 5 V). It delivers 400 kHz gain bandwidth with 0.19 V/µs slew rate and operates from 1.8 V to 5.5 V supply, making it ideal for high-accuracy sensor front-ends in portable medical instrumentation.

For engineers reviewing the TSZ121ICT datasheet, TSZ121ICT pinout, TSZ121ICT application, or TSZ121ICT equivalent, this device is selected where zero-drift performance, ESD robustness (4 kV HBM), extended temperature range (−40 °C to +125 °C), and SC70-5 micro-package compatibility are critical for battery-powered signal conditioning.

Technical Context

The TSZ121ICT employs a 400 kHz chopper clock to continuously correct input offset voltage and suppress 1/f noise-enabling stable DC accuracy without calibration. Its CMOS input stage achieves ultra-low input bias current (≤300 pA over temperature) and high common-mode rejection (115 dB min).

It integrates internal low-pass filtering to reject chopper ripple, supports rail-to-rail output swing within 30 mV of rails, and maintains phase margin ≥53° across 1.8–5.5 V supply and full temperature range-ensuring stability with 100 pF capacitive loads.

Key Specifications

Parameter	Value and Actual Design Meaning
Input offset voltage	5 µV max at 25 °C; enables <1 LSB error in 16-bit SAR ADC front-ends with ±100 mV input range
Offset drift	10–30 nV/°C; ensures <0.3 µV total drift over 100 °C span-critical for uncalibrated industrial sensors
Supply voltage range	1.8 V to 5.5 V; supports direct interface with Li-ion (3.0–4.2 V), coin-cell (1.8–3.0 V), and 5 V logic systems
Quiescent current	40 µA max at 5 V; allows >1-year battery life in 10 µA sleep-cycle IoT nodes using duty-cycled sensing
Gain bandwidth product	400 kHz; sufficient for 100 Hz–1 kHz biomedical signals (ECG, EEG) with ≥40 dB closed-loop gain
EMI rejection rate	91 dB at 2.4 GHz; prevents RF rectification errors in wireless-enabled wearable devices
Common-mode rejection	115 dB min; rejects >100 mV power-supply ripple in single-supply sensor bridges

Pinout & Package

TSZ121ICT is packaged in SC70-5 (SOT-353), a 1.25 mm × 1.65 mm, 0.65 mm pitch surface-mount package with exposed pad (not electrically connected). Pin 1 = Non-inverting input (+IN), Pin 2 = Inverting input (−IN), Pin 3 = V_CC− (ground), Pin 4 = Output (OUT), Pin 5 = V_CC+.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Non-inverting input	High-impedance CMOS node; accepts rail-to-rail common-mode voltages from V_CC− −0.1 V to V_CC+ +0.1 V
Pin 2	Inverting input	Matches Pin 1 in bias current (<300 pA) and offset voltage contribution; enables precision differential gain configurations
Pin 3	V_CC− (Ground)	Reference return for all internal circuitry; must be low-impedance to minimize PSRR degradation
Pin 4	Output	Rail-to-rail capable: drives within 30 mV of either rail at 5 V supply; supports 15 mA sink/source
Pin 5	V_CC+ (Supply)	Accepts 1.8–5.5 V; internal LDO regulates core bias-enables stable operation despite supply ripple up to 100 mV_pp

Key Features

Feature	Design Value
Chopper stabilization	400 kHz internal clock cancels input offset and 1/f noise-eliminates need for external auto-zero circuitry
Rail-to-rail I/O	Enables full dynamic range utilization in single-supply systems (e.g., 0–3.3 V ADC reference) without level-shifting
Ultra-low power	40 µA max ICC allows integration into always-on health monitors with <1 µW standby power per channel
High ESD tolerance	4 kV HBM rating permits direct handling in non-ESD-controlled assembly environments without added protection diodes
Extended temperature range	Specified from −40 °C to +125 °C-qualified for under-hood automotive cabin sensors and industrial motor control feedback loops

Applications

Medical Sensor Interface

Portable Gas Detector

Use Scenario: Amplifying low-level thermopile or electrochemical cell outputs (1–100 µV) in handheld CO/NO₂ analyzers.

IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with <5 µV offset to preserve sub-ppm gas concentration resolution.

Use Value: Eliminates factory calibration drift over temperature-reducing BOM cost by removing trim potentiometers and reference buffers.

Use Scenario: Conditioning pH electrode signals in battery-powered water quality testers.

IC Role / Device Role / Timing Role: High-input-impedance buffer (Z_IN > 10¹² Ω) with rail-to-rail output driving 12-bit SAR ADC.

Use Value: 300 pA max input bias current prevents electrode polarization error-maintaining ±0.01 pH accuracy over 24-hour field use.

Wearable Biopotential Monitor

Industrial Strain Gauge Bridge

Use Scenario: Front-end amplification for dry-electrode ECG/EMG in fitness bands with coin-cell power.

IC Role / Device Role / Timing Role: First-stage instrumentation amplifier with 115 dB CMRR rejecting motion-induced common-mode interference.

Use Value: 40 µA supply current extends battery life to 14 days continuous recording-meeting FDA Class II wearable requirements.

Use Scenario: Signal conditioning for quarter-bridge load cells in smart factory weight scales.

IC Role / Device Role / Timing Role: Low-drift difference amplifier with 120 dB PSRR rejecting 50/60 Hz mains coupling in noisy plant environments.

Use Value: 8 µV max offset over −40 °C to +125 °C ensures ≤0.02% FS error across ambient temperature swings-replacing temperature-compensated modules.

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	Lower offset drift (0.02 µV/°C typ) but higher quiescent current (17 µA typ vs. TSZ121ICT's 28–40 µA); no EMI rejection spec provided	Better for ultra-stable lab equipment; less suitable for EMI-prone portable devices due to missing 91 dB @ 2.4 GHz EMI RR	Select OPA333 when drift dominates error budget and EMI immunity is secondary
MCP6V81T-E/OT	Higher offset (25 µV max) and wider supply range (1.8–5.5 V same), but lower noise (1.1 µV_PP vs. 0.75 µV_PP)	Preferred for low-noise audio preamps; insufficient for <1 µV-offset medical diagnostics requiring 16-bit linearity	Select MCP6V81 only if noise is primary concern and offset can be calibrated out

Compared with OPA333AIDBVR and MCP6V81T-E/OT, TSZ121ICT uniquely balances ultra-low offset (5 µV), industry-leading EMI rejection (91 dB @ 2.4 GHz), and micropower operation-making it optimal for uncalibrated, battery-powered, RF-dense medical and industrial edge sensors.

Availability

TSZ121ICT is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-powered gas detection, wearable biopotential monitoring, and industrial strain gauge signal conditioning requiring stable component supply across automotive and industrial temperature ranges.

Supply support for TSZ121ICT 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 TSZ12x series belongs to ST's precision analog portfolio, engineered specifically for zero-drift, micropower signal conditioning in resource-constrained, high-accuracy sensing applications-including medical diagnostics and predictive maintenance systems.

FAQ

What is the maximum capacitive load the TSZ121ICT can drive while maintaining stability?

The TSZ121ICT is specified stable with up to 100 pF capacitive load at unity gain, as confirmed by phase margin ≥53° in Table 5 and Figure 22. Driving >100 pF requires external isolation resistor (≥100 Ω) between output and load to prevent peaking or oscillation-verified in application note AN4952.

Does the TSZ121ICT require external components for chopper ripple filtering?

No. The TSZ121ICT integrates an on-chip low-pass filter that attenuates chopper ripple by >60 dB at 400 kHz, eliminating need for external RC filters. Measured output ripple is <100 nV_PP (0.1–10 Hz) per Figure 26-sufficient for 16-bit precision without post-filtering.

Can the TSZ121ICT operate with a 1.5 V supply?

No. The absolute maximum rating specifies minimum supply voltage of 1.8 V (Table 1), and electrical characteristics are guaranteed only from 1.8 V to 5.5 V (Table 2). Operation below 1.8 V risks undefined behavior, including failure to start up or excessive offset drift-per DS9216 Rev 11 Section 2.

Is the exposed pad on the SC70-5 package electrically connected?

No. Per DS9216 Rev 11 page 2, the exposed pad on TSZ121ICT's SC70-5 package "can be connected to V_CC− or left floating"-it has no internal connection and serves solely as a thermal relief path. PCB layout should connect it to ground plane for thermal performance, but electrical isolation is maintained.

TSZ121ICT Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 5-TSSOP, SC-70-5, SOT-353

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:: 31µA

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:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SC-70-5

TSZ121ICT FAQ

1.How can I place an order for TSZ121ICT through Aetrix?

Please submit a Request for Quotation (RFQ) for TSZ121ICT 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 TSZ121ICT reliable?

The price and inventory of TSZ121ICT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSZ121ICT is usually 5 days.

3.What payment methods are accepted for TSZ121ICT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSZ121ICT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TSZ121ICT?

TSZ121ICT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TSZ121ICT 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 TSZ121ICT?

For technical support, including TSZ121ICT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSZ121ICT requirements.

6.How does Aetrix verify that TSZ121ICT is sourced from the original manufacturer or authorized distributors?

All TSZ121ICT 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 TSZ121ICT meets industry standards.

7.What is the process for return or replacement of TSZ121ICT?

All TSZ121ICT units undergo pre-shipment inspection (PSI). If there is an issue with TSZ121ICT, 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 TSZ121ICT part is unused and in its original packaging.

Return procedure for TSZ121ICT:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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