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

STMicroelectronics TS921IPT

Name: TS921IPT
Brand: STMicroelectronics
SKU: TS921IPT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TS921IPT

Manufacturer:: STMicroelectronics

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 8-TSSOP (0.173", 4.40mm Width)

Datasheet:: TS921IPT.pdf

Description:: IC OPAMP GP 1 CIRCUIT 8TSSOP

Quantity:: RFQ Add To RFQ list

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Inventory:1,998

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Product details

Overview

TS921IPT from STMicroelectronics is a rail-to-rail input/output single BiCMOS operational amplifier optimized for 3 V and 5 V battery-powered audio systems, delivering 80 mA output current into 32 Ω loads, 4 MHz gain-bandwidth product, 1 V/μs slew rate, and 9 nV/√Hz input noise at 1 kHz.

For engineers reviewing the TS921IPT datasheet, TS921IPT pinout, TS921IPT application, or TS921IPT equivalent, key selection considerations include low-voltage rail-to-rail operation, high-output-current capability for headphone and piezo drivers, low-noise performance in instrumentation, and TSSOP8 packaging for space-constrained portable designs.

Technical Context

The TS921 employs a BiCMOS input stage enabling rail-to-rail common-mode input range (V_CC − 0.2 V to V_CC + 0.2 V) and rail-to-rail output swing within 100 mV of supply rails under 32 Ω load. Its architecture supports stable operation with capacitive loads up to 500 pF without external compensation.

It achieves 80 dB CMRR and PSRR across 2.7–12 V supply range, with input offset voltage drift of only 2 μV/°C and THD of 0.005% at 1 kHz driving 600 Ω - critical for fidelity-sensitive audio signal paths and low-noise sensor conditioning.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	2.7 V to 12 V - enables direct integration into single-cell Li-ion (3.0–3.6 V), dual-cell alkaline (3.0 V), and 5 V USB-powered systems.
Output Current	80 mA - drives 32 Ω headphones or piezoelectric actuators directly without external buffers.
Gain-Bandwidth Product	4 MHz - supports unity-gain stable audio amplification up to ~200 kHz with margin for feedback loop stability.
Slew Rate	1 V/μs - preserves transient integrity in 10 V_PP audio signals up to ~160 kHz without slew-induced distortion.
Input Noise Density	9 nV/√Hz at 1 kHz - ensures ≤0.5 μV RMS integrated noise in 20 Hz–20 kHz band for microphone preamp use.
THD + N	0.005% at 1 kHz, 600 Ω - meets high-fidelity line driver and sound card requirements per IEC 60268-3.
ESD Protection	1.5 kV HBM - provides robust handling during PCB assembly and end-user device integration.

Pinout & Package

TSSOP8 (Thin Shrink Small Outline Package), 3.00 mm × 4.40 mm body, 0.65 mm pitch, 0.75 mm max height - RoHS-compliant, ECOPACK®-qualified surface-mount package optimized for automated placement and thermal dissipation in portable devices.

Pin/Terminal	Circuit Role	Design Meaning
Inverting Input (−)	Differential input node	Accepts feedback network connection; input bias current ≤100 nA minimizes offset error in high-impedance sensor interfaces.
Non-inverting Input (+)	Differential input node	Reference point for signal source; rail-to-rail common-mode range allows ground-referenced inputs at 3 V supply.
Output	Amplified signal source	Delivers ±80 mA into 32 Ω; output swing within 100 mV of rails enables full dynamic range utilization in low-voltage systems.
V_CC	Positive supply terminal	Connects to main system rail (2.7–12 V); internal ESD protection clamps transients to safe levels.
V_EE/GND	Negative supply / reference	Ground return path; supports single-supply operation with input common-mode down to −0.2 V relative to GND.

Key Features

Feature	Design Value
Rail-to-rail I/O	Enables full 0–3 V output swing from 3.3 V supply, maximizing SNR in battery-powered audio codecs.
80 mA output drive	Eliminates need for discrete output transistors when driving 32 Ω headphones or 100 pF piezo elements.
9 nV/√Hz input noise	Supports <1 μV RMS noise floor in 20 kHz bandwidth - suitable for electret microphone preamplifiers.
Stable with 500 pF load	Permits direct connection to long PCB traces or LCD backlight cables without phase-margin degradation.
1.5 kV HBM ESD rating	Reduces field failure risk in handheld consumer electronics subjected to human-handling discharge events.

Applications

Headphone Amplifier

Piezoelectric Speaker Driver

Use Scenario: Driving stereo 32 Ω dynamic headphones from a 3.3 V microcontroller DAC output in portable media players.

IC Role / Device Role / Timing Role: Single-supply, rail-to-rail output buffer with low THD and high current delivery to maintain audio fidelity.

Use Value: Delivers >100 mW into 32 Ω with <0.01% THD, eliminating external boost stages and reducing BOM count by one IC.

Use Scenario: Driving ultrasonic piezoelectric transducers in proximity sensors or haptic feedback modules.

IC Role / Device Role / Timing Role: High-slew-rate voltage amplifier delivering fast edge transitions to excite resonant piezo elements.

Use Value: 1 V/μs slew rate enables clean 100 kHz square-wave drive; 80 mA peak current sustains mechanical displacement amplitude.

Sound Card Line Driver

Instrumentation Low-Noise Amplifier

Use Scenario: Buffering analog audio outputs on PC sound cards to drive 600 Ω professional audio equipment.

IC Role / Device Role / Timing Role: Unity-gain stable line driver with high PSRR to reject digital noise coupling from host motherboard.

Use Value: 80 dB PSRR at 5 V supply suppresses switching noise from adjacent DC-DC converters; 0.005% THD meets AES17 compliance.

Use Scenario: Pre-amplifying low-level thermocouple or strain gauge signals in portable data loggers.

IC Role / Device Role / Timing Role: Low-noise, low-drift instrumentation amplifier front-end stage with rail-to-rail input for wide dynamic range.

Use Value: 9 nV/√Hz noise and 2 μV/°C drift enable sub-10 μV measurement resolution over −40 °C to +85 °C ambient.

Equivalent & Alternatives

The following parts are listed as comparable options for similar rail-to-rail operational amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LMV321IDBVR	Lower output current (40 mA), higher input bias current (100 pA vs. 15 nA), same TSSOP8 package.	Not suitable for 32 Ω headphone loads; acceptable for line-level buffering where drive strength is secondary.	Select when cost sensitivity outweighs output drive needs and noise is less critical.
MCP6001T-E/OT	Lower GBW (1 MHz), lower slew rate (0.6 V/μs), higher input offset (1.5 mV typ.), same SOT-23-5 footprint.	Insufficient bandwidth and slew for high-fidelity audio; better suited for low-speed sensor signal conditioning.	Choose for ultra-low-power (<100 μA) applications where audio performance is not required.

Compared with LMV321IDBVR and MCP6001T-E/OT, TS921IPT uniquely combines 80 mA drive, 4 MHz GBW, and 9 nV/√Hz noise in TSSOP8 - making it the only option among the three capable of driving 32 Ω headphones while maintaining <0.01% THD at 1 kHz.

Availability

TS921IPT is available at Aetrix Electronics and suitable for portable audio systems, piezoelectric actuator control, and low-noise instrumentation requiring stable component supply across industrial temperature range (−40 °C to +125 °C).

Supply support for TS921IPT 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, mixed-signal, power, and microcontroller solutions for automotive, industrial, and consumer markets.

The TS921 belongs to ST's precision rail-to-rail op-amp product line, engineered specifically for high-fidelity, low-voltage audio and sensor signal conditioning where output drive, noise, and distortion are design-critical parameters.

FAQ

What is the maximum capacitive load the TS921IPT can drive without instability?

The TS921IPT is specified stable with capacitive loads up to 500 pF when configured in unity-gain configuration. This is confirmed in the datasheet's "Electrical Characteristics" section and validated via phase margin measurements (68°) and gain margin (12 dB) at CL = 100 pF. For loads exceeding 500 pF, external series resistance at the output is recommended to preserve stability.

Does the TS921IPT support true single-supply operation with input signals extending to ground?

Yes. The TS921IPT features rail-to-rail input common-mode range from V_EE − 0.2 V to V_CC + 0.2 V. With V_EE tied to ground, this allows input signals down to −0.2 V - effectively enabling ground-referenced operation and compatibility with zero-V input sources such as microcontroller DACs or MEMS microphone outputs.

Can the TS921IPT be used in a split-supply configuration?

Yes. The TS921IPT operates with total supply voltage from 2.7 V to 12 V and supports symmetrical supplies (e.g., ±2.5 V, ±3 V) or asymmetrical configurations (e.g., +5 V / GND). Its input and output stages remain fully functional across the full common-mode and output swing ranges regardless of supply topology, as verified in Tables 4 and 5 of the datasheet.

Is the TS921IPT pin-compatible with other ST op-amps in TSSOP8 package?

No. While the TS921IPT uses standard TSSOP8 pinout (SOIC-8 compatible), it is not pin-compatible with ST's TS912 or TS922 due to differing internal architecture and biasing - particularly in quiescent current behavior and output stage design. Always verify pin functions against the specific device's datasheet before board-level substitution.

TS921IPT Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Amplifier Type:: General Purpose

Number of Circuits:: 1

Output Type:: Rail-to-Rail

Slew Rate:: 1.3V/µs

Gain Bandwidth Product:: 4 MHz

-3db Bandwidth:: -

Current - Input Bias:: 15 nA

Voltage - Input Offset:: 3 mV

Current - Supply:: 1mA

Current - Output / Channel:: 80 mA

Voltage - Supply Span (Min):: 2.7 V

Voltage - Supply Span (Max):: 12 V

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-TSSOP

TS921IPT FAQ

1.How can I place an order for TS921IPT through Aetrix?

Please submit a Request for Quotation (RFQ) for TS921IPT 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 TS921IPT reliable?

The price and inventory of TS921IPT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS921IPT is usually 5 days.

3.What payment methods are accepted for TS921IPT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS921IPT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TS921IPT?

TS921IPT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TS921IPT 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 TS921IPT?

For technical support, including TS921IPT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS921IPT requirements.

6.How does Aetrix verify that TS921IPT is sourced from the original manufacturer or authorized distributors?

All TS921IPT 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 TS921IPT meets industry standards.

7.What is the process for return or replacement of TS921IPT?

All TS921IPT units undergo pre-shipment inspection (PSI). If there is an issue with TS921IPT, 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 TS921IPT part is unused and in its original packaging.

Return procedure for TS921IPT:

1.Submit a request within 90 days.

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

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