Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Linear > Audio Amplifiers

STMicroelectronics A22H165J

Name: A22H165J
Brand: STMicroelectronics
SKU: A22H165J
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: A22H165J

Manufacturer:: STMicroelectronics

Category:: Audio Amplifiers

Package:: 16-WFBGA, FCBGA

Datasheet:: A22H165J.pdf

Description:: IC AMP CLASS G STEREO 16FLIPCHIP

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:4,956

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

A22H165 from STMicroelectronics is a class-G stereo headphone amplifier with integrated high-efficiency step-down DC-DC converter, designed for battery-powered portable audio systems. It delivers 100 µW/channel at 10 dB crest factor with only 2.1 mA total supply current, achieves 0.006% THD+N at 1 kHz, 100 dB PSRR at 217 Hz, and operates from 2.3 V to 4.8 V supply. It enables capacitor-less output coupling in space-constrained smartphones and wearables.

For engineers reviewing the A22H165 datasheet, A22H165 pinout, A22H165 application, or A22H165 equivalent, key selection considerations include its dual-rail adaptive power supply (±1.2 V / ±1.9 V), zero pop-and-click startup, 0.6 mA/channel quiescent current, and flip-chip 1.65 mm × 1.65 mm package with 16 bumps and 400 µm pitch.

Technical Context

The A22H165 implements a 2-level class-G architecture where internal DC-DC converters dynamically switch between ±1.2 V and ±1.9 V supply rails based on real-time audio signal amplitude, minimizing power dissipation during low-level playback while preserving dynamic range during peaks. Its fully capacitive inverter generates symmetrical negative rail (PVSS) without inductors.

It uses a dedicated common-mode sense (CMS) pin to reject ground noise, supports single-ended or differential inputs, and requires an external 12 Ω series output resistor for unconditional stability across 0.8–100 nF capacitive loads. Gain is set via a digital control pin (0 dB or 6 dB), with input logic thresholds of 0.6 V (low) and 1.3 V (high).

Key Specifications

Parameter	Value and Actual Design Meaning
Supply voltage range	2.3 V to 4.8 V - compatible with single-cell Li-ion/Li-poly batteries without external regulation.
Quiescent current	0.6 mA/channel - enables ultra-low power standby in always-on audio subsystems.
THD+N @ 1 kHz	0.006% typical - ensures high-fidelity audio reproduction with minimal harmonic distortion.
PSRR @ 217 Hz	100 dB typical - rejects switching noise from PMICs and RF transceivers in mobile platforms.
SNR (A-weighted)	100 dB - provides wide dynamic range for high-resolution audio playback.
Output coupling	Capacitor-less - eliminates bulky 100+ µF DC-blocking capacitors, saving PCB area and cost.
Standby current	5 µA max - supports long battery life in sleep-mode wearable devices.
Gain settings	0 dB or 6 dB - selectable via single logic pin, simplifying system-level gain staging.

Pinout & Package

Package: Flip-chip, 1.65 mm × 1.65 mm, 16-bump array, 400 µm pitch. Bumps located on underside; top-side markings indicate orientation.

Pin/Terminal	Circuit Role	Design Meaning
A1 (SW)	Switching node of buck converter	Connects to external inductor L1; carries high-frequency pulsed current; requires tight layout and low-inductance routing.
A2 (AVDD)	Analog supply input	Main battery connection (2.3–4.8 V); powers internal analog circuitry and DC-DC controller.
A3 (VOUTL)	Left channel output	Drives left headphone load through mandatory 12 Ω series resistor; no DC-blocking cap needed.
A4 (INL−)	Negative input for left channel	Differential input pair; used with INL+ for noise-rejecting balanced operation.
B1 (AGND)	Analog ground reference	Primary ground return for analog signals and internal DC-DC feedback; must be star-connected near device.
B2 (C1)	Flying capacitor terminal	Connects to C12 (2.2 µF) for internal negative supply generation via charge pump topology.
B3 (HPVDD)	High-rail positive supply output	Internally generated +1.2 V / +1.9 V rail; never connect external supply - risk of damage.
B4 (INL+)	Positive input for left channel	Differential input pair; forms 33.2 kΩ differential impedance with INL− at 6 dB gain.
C1 (C2)	Flying capacitor terminal	Second terminal of C12; completes full-capacitive inverter path for PVSS generation.
C2 (PVSS)	Negative supply generator output	Internally generated −1.2 V / −1.9 V rail; powers amplifier output stage; no external connection.
C3 (CMS)	Common-mode sense	Must be routed directly to headphone jack ground; cancels ground bounce and improves CMRR.
C4 (INR+)	Positive input for right channel	Differential input pair; matches INL+ characteristics for channel-to-channel gain matching (±0.5 dB).
D1 (EN)	Amplifier enable control	Active-high logic input; <0.6 V disables amplifier and reduces current to ≤5 µA.
D2 (GAIN)	Gain select control	0.6 V = 0 dB, 1.3 V = 6 dB; sets closed-loop gain with <0.5 dB matching between channels.
D3 (VOUTR)	Right channel output	Drives right headphone load; identical electrical behavior and layout requirements as VOUTL.
D4 (INR−)	Negative input for right channel	Differential complement to INR+; enables true balanced input configuration.

Key Features

Feature	Design Value
Adaptive dual-rail class-G supply	Switches between ±1.2 V and ±1.9 V in real time to minimize power loss during low-amplitude audio segments.
Integrated DC-DC step-down converter	Eliminates need for external PMIC rail; uses single 3.3 µH inductor and 10 µF ceramic tank capacitor (Ct).
Capacitor-less output architecture	Removes >100 µF electrolytic output coupling caps, reducing BOM count, board area, and aging-related drift.
Common-mode sense (CMS) pin	Enables rejection of ground noise induced by shared return paths in compact handheld PCB layouts.
Zero pop-and-click startup	Uses auto-zero technology and controlled ramp-up to prevent audible transients during power-on/off sequencing.
Unconditional stability	Maintains phase margin across 16–47 Ω loads and 0.8–100 nF capacitances without external compensation.

Applications

Smartphone Audio Subsystem

Wireless Earbud Driver

Use Scenario: Driving stereo headphones directly from baseband/application processor audio DAC outputs in slim-profile smartphones.

IC Role / Device Role / Timing Role: Class-G headphone amplifier with integrated DC-DC converter, providing rail-adaptive biasing and capacitor-less output coupling.

Use Value: Reduces total solution size by eliminating two 100 µF output caps and associated footprint; extends battery life via 2.1 mA @ 100 µW efficiency.

Use Scenario: Delivering low-noise, high-SNR audio to miniature balanced-armature drivers in true wireless stereo (TWS) earbuds.

IC Role / Device Role / Timing Role: Ultra-low-quiescent-current stereo amplifier with 5 µA standby mode and fast wake-up for intermittent playback.

Use Value: Enables >10-hour playback on 40 mAh battery; 100 dB SNR preserves detail in high-resolution codecs like LDAC and aptX Adaptive.

Fitness Tracker Audio Feedback

Portable Medical Monitor Audio Alert

Use Scenario: Generating voice prompts and tone alerts in wrist-worn fitness trackers with strict height and power constraints.

IC Role / Device Role / Timing Role: Compact stereo driver supporting mono or stereo output, with CMS pin rejecting noise from motion sensor and Bluetooth radio grounds.

Use Value: 1.65 mm × 1.65 mm flip-chip package fits under curved display bezels; 0.6 mA/channel quiescent current minimizes impact on sensor runtime.

Use Scenario: Providing audible alarm tones and spoken status updates in handheld ECG or pulse oximeter devices requiring clinical-grade reliability.

IC Role / Device Role / Timing Role: High-PSRR (100 dB @ 217 Hz) headphone amplifier immune to switching noise from medical-grade isolated DC-DC supplies.

Use Value: Ensures clear, distortion-free alerts even during concurrent ECG acquisition; thermal shutdown protects against fault-induced overheating.

Equivalent & Alternatives

The following parts are listed as comparable options for similar stereo headphone amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX98357A	Class-D, I²S-input only, no integrated DC-DC, requires external 1.8 V/3.3 V rails.	Lacks adaptive supply and capacitor-less output; needs larger output filter and decoupling network.	Choose when digital audio interface is preferred and board space allows discrete power rail management.
TPA6138A2	Class-AB, fixed ±1.8 V supply, higher 2.5 mA quiescent current, no DC-DC integration.	No rail adaptation or efficiency optimization; requires external negative supply or charge pump.	Choose for legacy designs where simplicity and proven THD+N (<0.01%) outweigh power savings.

Compared with MAX98357A and TPA6138A2, the A22H165 uniquely combines class-G efficiency, integrated dual-rail DC-DC, and capacitor-less output in a sub-2.7 mm² package-making it optimal for battery-limited, space-constrained portable audio where analog input and ultra-low idle power are critical.

Availability

A22H165 is available at Aetrix Electronics and suitable for smartphone audio subsystems, wireless earbud drivers, fitness tracker feedback systems, and portable medical monitor audio alerts requiring stable component supply across high-volume production cycles.

Supply support for A22H165 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 microcontrollers, analog ICs, power management, and MEMS sensors for automotive, industrial, and consumer markets.

The A22H165 belongs to ST's high-efficiency audio amplifier product line, engineered specifically for ultra-low-power, space-constrained portable devices demanding premium audio quality without compromising battery life.

FAQ

What is the minimum required output series resistor for stable operation?

The A22H165 mandates a minimum 12 Ω resistor in series with each output (VOUTL/VOUTR). This resistor ensures unconditional stability across all specified load capacitances (0.8–100 nF) and impedances (≥16 Ω), preventing oscillation due to cable and transducer parasitics. Omitting or reducing this value risks instability and audible artifacts.

Can HPVDD or PVSS pins be connected to external supplies?

No - HPVDD and PVSS are internal power rail outputs generated by the integrated DC-DC converter and capacitive inverter. Connecting external voltage sources to these pins will damage the device. These pins must remain unconnected except for recommended decoupling (Ct on HPVDD) and proper grounding (PVSS tied only to AGND via low-inductance path).

How does the CMS pin improve audio performance in noisy environments?

The CMS pin senses common-mode voltage at the headphone jack ground point and feeds it back to the amplifier's input stage, enabling active cancellation of ground-bounce noise induced by shared return paths with RF, sensors, or processors. Layout requires direct, short trace from CMS to jack ground pad - deviation degrades CMRR below 45 dB.

What is the maximum allowable load capacitance without compromising THD+N?

The A22H165 maintains ≤0.02% THD+N up to 100 nF load capacitance when used with the mandatory 12 Ω series output resistor. Exceeding 100 nF may degrade high-frequency response and increase distortion due to phase margin reduction; ST specifies 0.8–100 nF as the validated operational range per Electrical Characteristics Table 4.

A22H165J Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 16-WFBGA, FCBGA

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: Class G

Output Type:: 2-Channel (Stereo)

Max Output Power x Channels @ Load:: -

Voltage - Supply:: 2.3V ~ 4.8V

Features:: Depop, Thermal Protection

Mounting Type:: Surface Mount

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Supplier Device Package:: 16-FlipChip (1.65x1.65)

A22H165J FAQ

1.How can I place an order for A22H165J through Aetrix?

Please submit a Request for Quotation (RFQ) for A22H165J 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 A22H165J reliable?

The price and inventory of A22H165J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A22H165J is usually 5 days.

3.What payment methods are accepted for A22H165J?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A22H165J transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for A22H165J?

A22H165J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your A22H165J 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 A22H165J?

For technical support, including A22H165J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A22H165J requirements.

6.How does Aetrix verify that A22H165J is sourced from the original manufacturer or authorized distributors?

All A22H165J 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 A22H165J meets industry standards.

7.What is the process for return or replacement of A22H165J?

All A22H165J units undergo pre-shipment inspection (PSI). If there is an issue with A22H165J, 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 A22H165J part is unused and in its original packaging.

Return procedure for A22H165J:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…