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

STMicroelectronics TSU104IQ4T

Name: TSU104IQ4T
Brand: STMicroelectronics
SKU: TSU104IQ4T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TSU104IQ4T

Manufacturer:: STMicroelectronics

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 16-VFQFN Exposed Pad

Datasheet:: TSU104IQ4T.pdf

Description:: IC CMOS 4 CIRCUIT 16QFN

Quantity:: RFQ Add To RFQ list

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Inventory:19,103

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Product details

Overview

TSU104IQ4T from STMicroelectronics is a quad 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, and operates across 1.5 V–5.5 V supply and –40 °C to 85 °C industrial temperature range - enabling direct use with coin-cell batteries in long-life portable instrumentation.

For engineers reviewing the TSU104IQ4T datasheet, TSU104IQ4T pinout, TSU104IQ4T application, or TSU104IQ4T equivalent, key selection criteria include sub-microamp quiescent current, rail-to-rail I/O swing at low voltage, input offset drift ≤5 µV/°C, unity-gain stability with capacitive loads up to 200 pF, and verified phase-reversal immunity in high-impedance sensor front-ends.

Technical Context

The TSU104IQ4T integrates four independent op-amp channels in a single QFN16 3×3 mm package, each featuring complementary PMOS/NMOS input stages enabling true rail-to-rail input common-mode range (V_CC– −0.1 V to V_CC+ +0.1 V) and output swing within 40 mV of both rails. Its 8 kHz GBP and 60° phase margin ensure stable unity-gain operation without external compensation.

Designed for high-impedance DC-coupled sensing, it guarantees input bias current ≤2 pA (25 °C), CMRR ≥65 dB over full temperature range, and EMIRR ≥73 dB at 400 MHz - critical for reliable operation in noisy battery-powered environments such as gas detectors and medical biosensors.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Current (per channel)	580 nA typ. at 1.8 V - enables >42-year operation on 220 mAh coin cell in always-on mode
Gain Bandwidth Product	8 kHz typ. - supports precision DC and sub-10 Hz sensor signals (e.g., PIR, electrochemical cells)
Input Bias Current	2 pA max at 25 °C - minimizes voltage error in MΩ-range sensor interfaces (e.g., pH, UV photodiodes)
Rail-to-Rail I/O	Input: (V_CC– −0.1 V) to (V_CC+ +0.1 V); Output: within 40 mV of rails - maximizes dynamic range at 1.5 V supply
Input Offset Voltage	±3.4 mV max (−40 °C to 85 °C) - enables <0.1% gain error in 100× amplification of µV-level transducer outputs
Unity-Gain Stable	Stable with CL ≤ 200 pF - eliminates need for isolation resistor in capacitive sensor buffers (e.g., piezoelectric, MEMS)
Operating Temperature	−40 °C to +85 °C - qualified for industrial metering, outdoor environmental sensors, and portable diagnostics

Pinout & Package

TSU104IQ4T is housed in a wettable flank QFN16 3×3 mm package (pitch 0.5 mm) with exposed thermal pad. Pin 1 is marked by dot; top-side markings include "TSU104" and date code. The package supports automated optical inspection (AOI) and provides low thermal resistance (R_thJA = 45 °C/W).

Pin/Terminal	Circuit Role	Design Meaning
1, 3, 5, 7	In1+, In2+, In3+, In4+	Non-inverting inputs - high-impedance (≥10¹³ Ω), rail-to-rail compatible
2, 4, 6, 8	In1−, In2−, In3−, In4−	Inverting inputs - matched to non-inverting inputs for CMRR ≥65 dB
9, 11, 13, 15	Out1, Out2, Out3, Out4	Amplified outputs - rail-to-rail swing, 4 mA sink/source capability at 3.3 V
10, 14	V_CC+, V_CC−	Power supply pins - decoupling capacitor (100 nF) required at V_CC+ to ground
12, 16	NC	No-connect terminals - must be left floating or tied to V_CC− per layout guidelines

Key Features

Feature	Design Value
Sub-µA quiescent current	580 nA/channel at 1.8 V - extends battery life beyond 40 years in intermittent-sampling systems
Rail-to-rail input stage	CMVR extends 0.1 V beyond rails - enables direct interface to resistive bridges and thermistors without level-shifting
Phase reversal immunity	Guaranteed no output inversion during input overdrive - prevents latch-up in pyroelectric (PIR) detection circuits
Low-frequency noise	8.1 µV_PP (0.1–10 Hz) - preserves signal integrity in slow-response gas and medical sensors
EMI robustness	EMIRR ≥73 dB at 400 MHz - suppresses RF interference from Bluetooth/WiFi co-location in portable readers

Applications

UV and Photo Sensors

Battery Current Sensing

Use Scenario: Amplifying photocurrent from UV-A photodiodes in wearable sun exposure monitors.

IC Role / Device Role / Timing Role: Transimpedance amplifier with 100 MΩ feedback resistor, operating continuously from CR2032 cell.

Use Value: 2 pA input bias ensures <0.2% gain error; 580 nA ICC enables 5+ year runtime without battery replacement.

Use Scenario: High-side current sensing in lithium-ion battery protection ICs for IoT nodes.

IC Role / Device Role / Timing Role: Precision difference amplifier measuring mV-level shunt voltage at 1.8 V system rail.

Use Value: Rail-to-rail input captures full shunt swing; ±3.4 mV V_OS limits current measurement error to <±1.5% at 1 A full scale.

Electrochemical Gas Sensors

Pyroelectric Passive Infrared (PIR) Detection

Use Scenario: Conditioning nanoamp-level current from CO or NO₂ electrochemical cells in air quality sensors.

IC Role / Device Role / Timing Role: Low-noise, zero-drift front-end amplifier with TIA configuration and guard ring layout.

Use Value: 8.1 µV_PP 0.1–10 Hz noise enables sub-ppm gas resolution; 2 pA I_IB prevents baseline drift in 24/7 operation.

Use Scenario: Amplifying µV-level output from dual-element PIR sensors in smart occupancy detectors.

IC Role / Device Role / Timing Role: DC-coupled instrumentation amplifier stage rejecting common-mode motion artifacts.

Use Value: Phase reversal immunity prevents false triggers during rapid ambient IR transients; 8 kHz GBP supports 0.1–10 Hz motion envelope detection.

Equivalent & Alternatives

The following parts are listed as comparable options for similar nanopower op amp applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TSU114IPT	Lower V_OS (±150 µV max), higher ICC (1.1 µA), same 8 kHz GBP	Better DC accuracy for precision medical analog front-ends; trades battery life for offset performance	Select when V_OS drift <2 µV/°C is mandatory and 2× current budget is acceptable
LTC2050CMS8#PBF	Zero-drift architecture, V_OS <1 µV, ICC = 1.1 mA - 2000× higher quiescent current	Required for µV-level strain gauge or thermocouple amplification; incompatible with coin-cell lifetime targets	Use only in line-powered or rechargeable systems where ultra-low offset outweighs power penalty

Compared with TSU104IQ4T, TSU114IPT offers superior DC precision at modest current cost, while LTC2050 provides microvolt-level offset at unsustainable power levels for battery operation - making TSU104IQ4T the optimal balance for multi-year, single-cell sensor nodes.

Availability

TSU104IQ4T is available at Aetrix Electronics and suitable for ultra-long-life battery-powered applications, electrochemical gas sensing, and portable medical instrumentation requiring stable component supply with guaranteed 10+ year production continuity.

Supply support for TSU104IQ4T 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 power management, analog, MEMS, and microcontrollers for industrial, automotive, and consumer markets.

The TSU10x series belongs to ST's nanopower precision op amp product line, designed specifically for energy-constrained sensor signal chains in battery-operated IoT endpoints, environmental monitors, and portable diagnostics equipment.

FAQ

What is the maximum capacitive load the TSU104IQ4T can drive without instability?

The TSU104IQ4T remains unity-gain stable with capacitive loads up to 200 pF when configured as a voltage follower, as verified by phase margin ≥60° across –40 °C to 85 °C. For loads >200 pF, a series isolation resistor (R_ISO ≥1 kΩ) is recommended per Figure 31 of DS9507 to maintain stability without degrading bandwidth.

Does the TSU104IQ4T support true rail-to-rail output at 1.5 V supply?

Yes - the TSU104IQ4T delivers rail-to-rail output swing down to 1.5 V supply, with VOL ≤40 mV and VOH ≤40 mV drop from respective rails under 100 kΩ load, as specified in Tables 3–5 of DS9507. This enables full utilization of the 1.5 V headroom in CR2016/CR2025-powered designs.

How is input bias current affected by common-mode voltage at 85 °C?

At 85 °C and V_CM = V_CC/2, input bias current is ≤30 pA (max), rising to ≤10 pA at V_CM = 0 V and ≤30 pA at V_CM = V_CC per Figure 9–11. This variation is fully characterized and does not compromise high-impedance sensor accuracy when V_CM is held near mid-supply via proper biasing.

Can the NC pins (12 and 16) be connected to ground or V_CC−?

Pins 12 and 16 are no-connect terminals with no internal connection. STMicroelectronics recommends leaving them unconnected or tying them to V_CC− (ground) to improve mechanical reliability and reduce floating node susceptibility - but never to V_CC+ or signal nets, as this may affect thermal pad soldering integrity.

TSU104IQ4T Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 16-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Amplifier Type:: CMOS

Number of Circuits:: 4

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 (x4 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:: 16-QFN (3x3)

TSU104IQ4T FAQ

1.How can I place an order for TSU104IQ4T through Aetrix?

Please submit a Request for Quotation (RFQ) for TSU104IQ4T 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 TSU104IQ4T reliable?

The price and inventory of TSU104IQ4T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSU104IQ4T is usually 5 days.

3.What payment methods are accepted for TSU104IQ4T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSU104IQ4T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TSU104IQ4T?

TSU104IQ4T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TSU104IQ4T 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 TSU104IQ4T?

For technical support, including TSU104IQ4T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSU104IQ4T requirements.

6.How does Aetrix verify that TSU104IQ4T is sourced from the original manufacturer or authorized distributors?

All TSU104IQ4T 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 TSU104IQ4T meets industry standards.

7.What is the process for return or replacement of TSU104IQ4T?

All TSU104IQ4T units undergo pre-shipment inspection (PSI). If there is an issue with TSU104IQ4T, 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 TSU104IQ4T part is unused and in its original packaging.

Return procedure for TSU104IQ4T:

1.Submit a request within 90 days.

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

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