TSZ121 | Product - STMicroelectronics

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Description

The TSZ12x series of high precision operational amplifiers offer very low input offset voltages with virtually zero drift.

TSZ121 is the single version, TSZ122 the dual version, and TSZ124 the quad version, with pinouts compatible with industry standards.

The TSZ12x series offers rail-to-rail input and output, excellent speed/power consumption ratio, and 400 kHz gain bandwidth product, while consuming less than 40 µA at 5 V. The devices also feature an ultra-low input bias current.

These features make the TSZ12x family ideal for sensor interfaces, battery-powered applications and portable applications.

All features
Very high accuracy and stability: offset voltage 5 µV max at 25 °C, 8 µV over full temperature range (-40 °C to 125 °C)

Rail-to-rail input and output

Low supply voltage: 1.8 - 5.5 V

Low power consumption: 40 µA max. at 5 V

Gain bandwidth product: 400 kHz

High tolerance to ESD: 4 kV HBM

Extended temperature range: -40 to 125 °C

Micro-packages: SC70-5, DFN8 2x2, and QFN16 3x3
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eDesignSuite

eDesignSuite is a comprehensive set of easy-to-use design-aid utilities ready to help you streamline the system development process with a wide range of ST products.

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Power Supply Design Tool

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• PFC design with analog and digitial control

• Supports various PCB configurations

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LED Lighting Design Tool

• Handles AC-DC and DC-DC design in common topologies

• Displays interactive and annotated schematic

• Provides current/voltage graphs, Bode plots, efficiency curves and power-loss data

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Digital Power Workbench

• Provides a step-by-step optimized design of power section and control loop

• Generates the STM32Cube embedded software package for custom applications and allows firmware project generation, compatible with multiple STM32 IDEs

Power Management Design Center

Power Tree Designer

• Specify input/output power for each node in the tree

• Check for consistency

• Design each individual node

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Thermal-electrical Simulators for Components

STPOWER Studio

• Supports long mission profiles

• Provides power loss and temperature graphs

• Helps define heatsink thermal properties

Thermal-electrical Simulators for Components

PCB Thermal Simulator

• Thermal analysis of a PCB from Gerber files.

• Possibility to add heat sources, heat sinks, copper areas and thermal paths.

• Powerful server-side engine for rendering and simulation.

• Thermal results shown graphically via 2D table.

Thermal-electrical Simulators for Components

AC Switches Simulator

• Select ratings and application waveforms

• Get junction temperature and blocking voltage graphs

• Search and sort suitable devices

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Rectifier Diodes Simulator

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• Estimate power losses

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• test

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Twister Sim

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• Supports load-compatibility, wiring harness optimization, fault condition impact and diagnostic analysis

• Supports various PCB configurations

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TVS Simulator

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Thermal-electrical Simulators for Components

Estimate

• Build simple schematics and firmware inputs in minutes

• Quickly generate reliable estimates of battery life, system power consumption and bill of materials costs

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Signal Conditioning Design Tool

Active Filters

• Handles multi-stage-designs and common topologies

• Returns circuit component values

• Provides gain, phase and group delay graphs

• Low Pass, High Pass and Band Pass

Signal Conditioning Design Tool

Comparators

• Handles most common configurations

• Returns circuit components values

• Provides I/O signal waveforms

• Inverting, Non Inverting, Window

Signal Conditioning Design Tool

Low side Current Sensing

• Returns circuit component values

• Provides current error graphs

Signal Conditioning Design Tool

High side Current Sensing

• Provides current error graphs.

• Help to select the right High side current sensing and shunt devices.

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NFC/RFID Calculators

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• Input geometry and substrate properties

• Get antenna impedance

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• The tool returns link budget estimate

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NFC Tuning Circuit

• Enter antenna parameter and matching target

• Select the topology of the matching network

• The tool returns component values for the desired design targets

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	Part number	Status	Description	Type	Supplier
Worldwide,Asia,Europe,Africa,North America,South America,Oceania,Afghanistan,Bahrain,Bangladesh,Bhutan,Brunei,Burma (Myanmar),Cambodia,China,East Timor,India,Indonesia,Iraq,Japan,Jordan,Kazakhstan,Kuwait,Kyrgyzstan,Laos,Malaysia,Maldives,Mongolia,Nepal,Oman,Pakistan,Philippines,Qatar,Russian Federation,Saudi Arabia,Singapore,South Korea,Sri Lanka,Taiwan,Tajikistan,Thailand,Turkmenistan,United Arab Emirates,Uzbekistan,Vietnam,Yemen,Albania,Andorra,Armenia,Austria,Azerbaijan,Belarus,Belgium,Bosnia and Herzegovina,Bulgaria,Croatia,Cyprus,Czech Republic,Denmark,Estonia,Finland,France,Georgia,Germany,Greece,Hungary,Iceland,Ireland,Israel,Italy,Latvia,Liechtenstein,Lithuania,Luxembourg,Macedonia,Malta,Moldova,Monaco,Montenegro,Netherlands,Norway,Poland,Portugal,Romania,San Marino,Serbia,Slovakia,Slovenia,Spain,Sweden,Switzerland,Turkey,Ukraine,United Kingdom,Vatican City,Algeria,Angola,Benin,Botswana,Burkina,Burundi,Cameroon,Cape Verde,Central African Republic,Chad,Comoros,Democratic Republic of Congo,Djibouti,Egypt,Equatorial Guinea,Eritrea,Ethiopia,Gabon,Gambia,Ghana,Guinea,Guinea-Bissau,Ivory Coast,Kenya,Lesotho,Liberia,Libya,Madagascar,Malawi,Mali,Mauritania,Mauritius,Morocco,Mozambique,Namibia,Niger,Nigeria,Rwanda,Sao Tome and Principe,Senegal,Seychelles,Sierra Leone,Somalia,South Africa,Swaziland,Tanzania,Togo,Tunisia,Uganda,Zambia,Zimbabwe,Antigua and Barbuda,Bahamas,Barbados,Belize,Canada,Costa Rica,Dominica,Dominican Republic,El Salvador,Grenada,Guatemala,Haiti,Honduras,Jamaica,Mexico,Nicaragua,Panama,Saint Kitts and Nevis,Saint Lucia,Saint Vincent and the Grenadines,Trinidad and Tobago,United States,Argentina,Bolivia,Brazil,Chile,Colombia,Ecuador,Guyana,Paraguay,Peru,Suriname,Uruguay,Venezuela,Australia,Fiji,Kiribati,Marshall Islands,Micronesia,Nauru,New Zealand,Palau,Papua New Guinea,Samoa,Solomon Islands,Tonga,Tuvalu,Vanuatu	ST-OPAMPS-APP	Active	Operational amplifier and comparator application for smartphones and tablets	Finder Apps	ST	ST-OPAMPS-APP Description: Operational amplifier and comparator application for smartphones and tablets

	Part number	Status	Description	Type	Supplier
Worldwide,Asia,Europe,Africa,North America,South America,Oceania,Afghanistan,Bahrain,Bangladesh,Bhutan,Brunei,Burma (Myanmar),Cambodia,China,East Timor,India,Indonesia,Iraq,Japan,Jordan,Kazakhstan,Kuwait,Kyrgyzstan,Laos,Malaysia,Maldives,Mongolia,Nepal,Oman,Pakistan,Philippines,Qatar,Russian Federation,Saudi Arabia,Singapore,South Korea,Sri Lanka,Taiwan,Tajikistan,Thailand,Turkmenistan,United Arab Emirates,Uzbekistan,Vietnam,Yemen,Albania,Andorra,Armenia,Austria,Azerbaijan,Belarus,Belgium,Bosnia and Herzegovina,Bulgaria,Croatia,Cyprus,Czech Republic,Denmark,Estonia,Finland,France,Georgia,Germany,Greece,Hungary,Iceland,Ireland,Israel,Italy,Latvia,Liechtenstein,Lithuania,Luxembourg,Macedonia,Malta,Moldova,Monaco,Montenegro,Netherlands,Norway,Poland,Portugal,Romania,San Marino,Serbia,Slovakia,Slovenia,Spain,Sweden,Switzerland,Turkey,Ukraine,United Kingdom,Vatican City,Algeria,Angola,Benin,Botswana,Burkina,Burundi,Cameroon,Cape Verde,Central African Republic,Chad,Comoros,Democratic Republic of Congo,Djibouti,Egypt,Equatorial Guinea,Eritrea,Ethiopia,Gabon,Gambia,Ghana,Guinea,Guinea-Bissau,Ivory Coast,Kenya,Lesotho,Liberia,Libya,Madagascar,Malawi,Mali,Mauritania,Mauritius,Morocco,Mozambique,Namibia,Niger,Nigeria,Rwanda,Sao Tome and Principe,Senegal,Seychelles,Sierra Leone,Somalia,South Africa,Swaziland,Tanzania,Togo,Tunisia,Uganda,Zambia,Zimbabwe,Antigua and Barbuda,Bahamas,Barbados,Belize,Canada,Costa Rica,Dominica,Dominican Republic,El Salvador,Grenada,Guatemala,Haiti,Honduras,Jamaica,Mexico,Nicaragua,Panama,Saint Kitts and Nevis,Saint Lucia,Saint Vincent and the Grenadines,Trinidad and Tobago,United States,Argentina,Bolivia,Brazil,Chile,Colombia,Ecuador,Guyana,Paraguay,Peru,Suriname,Uruguay,Venezuela,Australia,Fiji,Kiribati,Marshall Islands,Micronesia,Nauru,New Zealand,Palau,Papua New Guinea,Samoa,Solomon Islands,Tonga,Tuvalu,Vanuatu	STEVAL-CCA058V1	Active	Training kit for operational amplifiers and comparators	Amplifier and comparator eval boards	ST	STEVAL-CCA058V1 Description: Training kit for operational amplifiers and comparators
Worldwide,Asia,Europe,Africa,North America,South America,Oceania,Afghanistan,Bahrain,Bangladesh,Bhutan,Brunei,Burma (Myanmar),Cambodia,China,East Timor,India,Indonesia,Iraq,Japan,Jordan,Kazakhstan,Kuwait,Kyrgyzstan,Laos,Malaysia,Maldives,Mongolia,Nepal,Oman,Pakistan,Philippines,Qatar,Russian Federation,Saudi Arabia,Singapore,South Korea,Sri Lanka,Taiwan,Tajikistan,Thailand,Turkmenistan,United Arab Emirates,Uzbekistan,Vietnam,Yemen,Albania,Andorra,Armenia,Austria,Azerbaijan,Belarus,Belgium,Bosnia and Herzegovina,Bulgaria,Croatia,Cyprus,Czech Republic,Denmark,Estonia,Finland,France,Georgia,Germany,Greece,Hungary,Iceland,Ireland,Israel,Italy,Latvia,Liechtenstein,Lithuania,Luxembourg,Macedonia,Malta,Moldova,Monaco,Montenegro,Netherlands,Norway,Poland,Portugal,Romania,San Marino,Serbia,Slovakia,Slovenia,Spain,Sweden,Switzerland,Turkey,Ukraine,United Kingdom,Vatican City,Algeria,Angola,Benin,Botswana,Burkina,Burundi,Cameroon,Cape Verde,Central African Republic,Chad,Comoros,Democratic Republic of Congo,Djibouti,Egypt,Equatorial Guinea,Eritrea,Ethiopia,Gabon,Gambia,Ghana,Guinea,Guinea-Bissau,Ivory Coast,Kenya,Lesotho,Liberia,Libya,Madagascar,Malawi,Mali,Mauritania,Mauritius,Morocco,Mozambique,Namibia,Niger,Nigeria,Rwanda,Sao Tome and Principe,Senegal,Seychelles,Sierra Leone,Somalia,South Africa,Swaziland,Tanzania,Togo,Tunisia,Uganda,Zambia,Zimbabwe,Antigua and Barbuda,Bahamas,Barbados,Belize,Canada,Costa Rica,Dominica,Dominican Republic,El Salvador,Grenada,Guatemala,Haiti,Honduras,Jamaica,Mexico,Nicaragua,Panama,Saint Kitts and Nevis,Saint Lucia,Saint Vincent and the Grenadines,Trinidad and Tobago,United States,Argentina,Bolivia,Brazil,Chile,Colombia,Ecuador,Guyana,Paraguay,Peru,Suriname,Uruguay,Venezuela,Australia,Fiji,Kiribati,Marshall Islands,Micronesia,Nauru,New Zealand,Palau,Papua New Guinea,Samoa,Solomon Islands,Tonga,Tuvalu,Vanuatu	STEVAL-ISQ014V1	Active	Low-side current sensing evaluation board based on the TSZ121 op amp	Amplifier and comparator eval boards	--	STEVAL-ISQ014V1 Description: Low-side current sensing evaluation board based on the TSZ121 op amp

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	Resource title	Version	Latest update	Actions	Details	Download

Product Specifications (1)

	Resource title	Version	Latest update	Actions	Update date	Options
PDF	Check to add DS9216 to the download list DS9216 Very high accuracy (5 μV) zero drift micropower 5 V operational amplifiers	11.0	11 Apr 2022	PDF	11 Apr 2022 DS9216 Very high accuracy (5 μV) zero drift micropower 5 V operational amplifiers 11.0

Application Notes (5)

	Resource title	Version	Latest update	Actions	Update date	Options
PDF	Check to add AN6365 to the download list AN6365 AC measurements on op amps	1.0	20 Jan 2026	PDF	20 Jan 2026 AN6365 AC measurements on op amps 1.0
PDF	Check to add AN4835 to the download list AN4835 High-side current sensing for applications using high common-mode voltage	1.0	28 Nov 2016	PDF	28 Nov 2016 AN4835 High-side current sensing for applications using high common-mode voltage 1.0
PDF	Check to add AN4587 to the download list AN4587 Input bias current of a chopper amplifier	1.0	10 Nov 2014	PDF	10 Nov 2014 AN4587 Input bias current of a chopper amplifier 1.0
PDF	Check to add AN4348 to the download list AN4348 Signal conditioning for electrochemical sensors	2.0	05 Sep 2017	PDF	05 Sep 2017 AN4348 Signal conditioning for electrochemical sensors 2.0
PDF	Check to add AN4586 to the download list AN4586 Signal conditioning, differential to single-ended amplification	1.0	10 Nov 2014	PDF	10 Nov 2014 AN4586 Signal conditioning, differential to single-ended amplification 1.0

Technical Notes & Articles (1)

	Resource title	Version	Latest update	Actions	Update date	Options
PDF	Check to add to the download list How to extend the performance of a low voltage precision op amp to a high voltage high-side current sensing application	1.0	21 Aug 2025	PDF	21 Aug 2025 How to extend the performance of a low voltage precision op amp to a high voltage high-side current sensing application 1.0

User Manuals (2)

	Resource title	Version	Latest update	Actions	Update date	Options
PDF	Check to add UM1737 to the download list UM1737 How to use the product evaluation board STEVAL-ISQ014V1 for low-side current sensing with the TSZ121 operational amplifier	1.0	26 May 2014	PDF	26 May 2014 UM1737 How to use the product evaluation board STEVAL-ISQ014V1 for low-side current sensing with the TSZ121 operational amplifier 1.0
PDF	Check to add UM0065 to the download list UM0065 MACROMODELS USER MANUAL FOR STANDARD LINEAR PRODUCTS	1.0	19 Mar 2002	PDF	19 Mar 2002 UM0065 MACROMODELS USER MANUAL FOR STANDARD LINEAR PRODUCTS 1.0

Design Notes & Tips (2)

	Resource title	Version	Latest update	Actions	Update date	Options
PDF	Check to add DT0015 to the download list DT0015 Chop away input offsets with TSZ121/TSZ122/TSZ124	1.0	31 Jan 2014	PDF	31 Jan 2014 DT0015 Chop away input offsets with TSZ121/TSZ122/TSZ124 1.0
PDF	Check to add DT0073 to the download list DT0073 Optical heart rate monitoring – OHRM based on X-NUCLEO-IKA01A1 expansion board	1.0	30 Nov 2016	PDF	30 Nov 2016 DT0073 Optical heart rate monitoring – OHRM based on X-NUCLEO-IKA01A1 expansion board 1.0

Presentations (3)

	Resource title	Version	Latest update	Actions	Update date	Options
PDF	Check to add to the download list Discover ST’s portfolio for signal conditioning, interface, and power management in wearables	2.2	02 Aug 2023	PDF	02 Aug 2023 Discover ST’s portfolio for signal conditioning, interface, and power management in wearables 2.2
PDF	Check to add to the download list Low-side current sensing	1.0	19 Mar 2025	PDF	19 Mar 2025 Low-side current sensing 1.0
PDF	Check to add to the download list What does precision mean for an op amp?	2.0	16 May 2023	PDF	16 May 2023 What does precision mean for an op amp? 2.0

Flyers (1)

	Resource title	Version	Latest update	Actions	Update date	Options
PDF	Check to add to the download list TSZ series high precision zero-drift op amp	4.0	01 Oct 2025	PDF	01 Oct 2025 TSZ series high precision zero-drift op amp 4.0

Brochures (3)

	Resource title	Version	Latest update	Actions	Update date	Options
PDF	Check to add to the download list Op amps & comparators. Amplify your performance	1.0	07 Jul 2025	PDF	07 Jul 2025 Op amps & comparators. Amplify your performance 1.0
PDF	Check to add to the download list Operational Amplifiers (Op Amps) - Quick Reference Guide	6.0	17 Feb 2026	PDF	17 Feb 2026 Operational Amplifiers (Op Amps) - Quick Reference Guide 6.0
PDF	Check to add to the download list Products and solutions for Smart industry	12.24	17 Dec 2024	PDF	17 Dec 2024 Products and solutions for Smart industry 12.24

EDA Symbols, Footprints and 3D Models

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	Resource title	Version	Latest update	Actions	Details	Download

SPICE models (1)

	Resource title	Version	Latest update	Actions	Update date	Options
ZIP	Check to add to the download list TSZ121 PSpice model	1.0	19 Feb 2026	ZIP	19 Feb 2026 TSZ121 PSpice model 1.0

SIMetrix models (1)

	Resource title	Version	Latest update	Actions	Update date	Options
ZIP	Check to add to the download list TSZ121 SIMetrix example schematics	2026.02	19 Feb 2026	ZIP	19 Feb 2026 TSZ121 SIMetrix example schematics 2026.02

Quality and Reliability

Part Number	Marketing Status	Package	Grade	RoHS Compliance Grade	Longevity Commitment	Longevity Starting Date	Material Declaration**
TSZ121ICT	Active	SC70-5	Industrial	Ecopack2 (**)	10	2023-05-23T00:00:00.000+02:00	PDF XML
TSZ121ILT	Active	SOT23-5L	Industrial	Ecopack3	10	2023-05-23T00:00:00.000+02:00	PDF XML
TSZ121IYCT	Active	SC70-5	Automotive	Ecopack3	10	2023-05-23T00:00:00.000+02:00	PDF XML
TSZ121IYLT	Active	SOT23-5L	Automotive	Ecopack3	10	2023-05-23T00:00:00.000+02:00	PDF XML

TSZ121ICT

Package:

SC70-5

Material Declaration**:

TSZ121ILT

Package:

SOT23-5L

Material Declaration**:

TSZ121IYCT

Package:

SC70-5

Material Declaration**:

TSZ121IYLT

Package:

SOT23-5L

Material Declaration**:

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

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