Overview
Sample & Buy
Solutions
Resources
Tools & Software
Quality & Reliability
eDesignSuite
Get Started
Partner products
Sales Briefcase
  • The A21SP16 is a differential class-D BTL power amplifier. It is able to drive up to 2.3 W into a 4 Ω load and 1.4 W into a 8 Ω load at 5 V. It achieves outstanding efficiency (88% typ.) compared to classical Class-AB audio amps.

    The gain of the device can be controlled via two external gain-setting resistors. Pop & click reduction circuitry provides low on/off switch noise while allowing the device to start within 5 ms. A standby function (active low) allows the reduction of current consumption to 10 nA typ.

    Key Features

    • Operating from VCC = 2.4 V to 5.5 V
    • Standby mode active low
    • Output power: 3 W into 4 Ω and 1.75 W into 8 Ω with 10% THD+N max and 5 V power supply
    • Output power: 2.3 W @ 5 V or 0.75 W @ 3 V into 4 Ω with 1% THD+N max
    • Output power: 1.4 W @ 5 V or 0.45 W @ 3 V into 8 Ω with 1% THD+N max
    • Adjustable gain via external resistors
    • Low current consumption 2 mA @ 3 V
    • Efficiency: 88% typ.
    • Signal to noise ratio: 85 dB typ.
    • PSRR: 63 dB typ. @ 217 Hz with 6 dB gain
    • PWM base frequency: 250 kHz
    • Low pop & click noise
    • Thermal shutdown protection
    • Available in flip-chip 9 x 300 μm (Pb-free)

Recommended for you

00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS10233
      3 W filter-free class-D audio power amplifier
      1.0
      855.96 KB
      PDF
      DS10233

      3 W filter-free class-D audio power amplifier

Presentations & Training Material

    • Description Version Size Action
      ST offering in Wearable - Analog and Mixed Signal Portfolio 3.0
      1.47 MB
      PDF

      ST offering in Wearable - Analog and Mixed Signal Portfolio

Publications and Collaterals

    • Description Version Size Action
      ST’s solutions for mobile devices 3.2
      2.13 MB
      PDF

      ST’s solutions for mobile devices

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
A21SP16J
Active
Chip Scale Package 0.5mm pitch Industrial Ecopack3

A21SP16J

Package:

Chip Scale Package 0.5mm pitch

Material Declaration**:

PDF XML

Marketing Status

Active

Package

Chip Scale Package 0.5mm pitch

Grade

Industrial

RoHS Compliance Grade

Ecopack3

(**) 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.

Sample & Buy

Part Number
Order from Distributors
Order from ST
Package
Packing Type
Temperature (°C) Marketing Status
ECCN (US)
Country of Origin
Budgetary Price (US$)*/Qty
min
max
A21SP16J Available at 4 distributors

Distributor availability ofA21SP16J

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4748 1 Order Now
RS COMPONENTS EUROPE 4340 1 Order Now
MOUSER WORLDWIDE 3603 1 Order Now
Farnell Element14 EUROPE 2353 1 Order Now

Distributor reported inventory date: 2020-07-02

Distributor Name

DIGIKEY

Stock

4748

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

4340

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

3603

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2353

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-02

Get sample Chip Scale Package 0.5mm pitch Tape And Reel - -
Active
EAR99 CHINA 0.4 / 1k

A21SP16J

Package

Chip Scale Package 0.5mm pitch

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.4 / 1k

Distributor availability ofA21SP16J

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4748 1 Order Now
RS COMPONENTS EUROPE 4340 1 Order Now
MOUSER WORLDWIDE 3603 1 Order Now
Farnell Element14 EUROPE 2353 1 Order Now

Distributor reported inventory date: 2020-07-02

Distributor Name

DIGIKEY

Stock

4748

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

4340

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

3603

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2353

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-02

Operating Temperature (°C)

(min)

-

(max)

-

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.4 / 1k

ECCN (US)

EAR99

Country of Origin

CHINA

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors