Nuvoton Launches the NSP2340BA24E Smart Buzzer: Voice Storage, a 24V Boost Stage and Class-AB Output on One Chip

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NuvotonSmart BuzzerPiezo BuzzerAudio ICHome Appliances
Nuvoton announced the NSP2340BA24E smart buzzer on 13 October 2026, integrating voice and sound-effect content storage, control logic, buzzer driving, a boost circuit and a Class-AB output stage into a single IC that drives a piezo buzzer directly. Published specifications: 2.0-5.5 V operating voltage, -40 to +85 degrees C, 69-315 seconds of voice capacity, UART / I2C slave / Two-Wire host interfaces, in-system programming for audio updates, selectable 10/12/18/24 V booster output, standby current of 3 microamps or less, and a TSSOP-28 package, with the SB2340-HN30A evaluation board. It targets designs that keep their existing piezo buzzer instead of moving to a speaker.

Nuvoton introduced the NSP2340BA24E smart buzzer on October 13, 2026, under the slogan "Beyond the Beep." The device integrates voice and sound-effect content storage, control logic, buzzer driving, a boost circuit and a Class-AB output stage on a single chip, and can drive a piezo buzzer directly to play voice prompts and melodies. According to Nuvoton's announcement, the architecture removes the need for external high-voltage components, external memory and an external amplifier.

From alert tone to audio interface

The buzzer has long been the simplest reliable audible-feedback element in appliances, security equipment and industrial machinery: simple in construction, durable and predictable in cost. What it could communicate, however, was limited to the difference between sounding and not sounding. Nuvoton's product description states that conventional buzzers are simple and reliable but can only emit a single beep, while smart devices call for more intuitive feedback that carries more information.

The NSP2340BA24E is positioned to turn the buzzer from an alert component into an audio interface that can convey status, notifications and warnings, with audio content customised per product. For a system designer the practical appeal is that the load type and mounting arrangement stay as they are: an existing buzzer can take on voice prompts without a speaker being selected in its place.

Five functions on one die

Per Nuvoton's description, functions that previously sat in separate components are consolidated: voice and sound-effect content is held in on-chip Flash, control logic and buzzer driving share the same device, a boost circuit raises the supply to the voltage a piezo element needs, and the output stage uses a Class-AB topology. The immediate consequence of that integration is a shorter external bill of materials.

Playing voice through a buzzer conventionally required external memory for the audio, a boost device for the drive voltage and an amplifier to push the load. Nuvoton states that the NSP2340BA24E architecture does without all three, which it says lowers BOM cost, PCB area and design complexity while maintaining acoustic performance. The part also includes very low standby current, automatic power management and built-in protection mechanisms, described by Nuvoton as meeting the reliability and power-efficiency requirements of consumer, industrial and medical systems.

Published specifications

The figures below are taken item by item from Nuvoton's published specification table and are not reworded:

  • Operating voltage: 2.0 V – 5.5 V
  • Operating temperature: -40°C ~ +85°C
  • Embedded memory: on-chip Flash for voice and sound-effect content, no external memory required
  • Voice capacity: 69 ~ 315 seconds
  • Host interfaces: UART / I²C (slave) / Two-Wire
  • Programming: in-system programming (ISP), audio content updatable from the host MCU
  • Booster output voltage: 10 V / 12 V / 18 V / 24 V selectable
  • Standby current: ≤ 3 µA
  • Package: TSSOP-28, RoHS compliant
  • Evaluation board: SB2340-HN30A, with buzzer output, user key input and power management circuitry, powered over USB Type-C or an external supply

Two entries in that table deserve separate comment. The booster offers four output settings — 10 V, 12 V, 18 V and 24 V — and piezo buzzers differ in the drive voltage they need, so a choice of steps lets one part cover models of differing sensitivity and sound-pressure level. The 69-to-315-second voice capacity spans more than four times, which maps onto content strategies ranging from a handful of short chimes to full spoken announcements.

The host interface is offered as UART, I²C slave or Two-Wire; for a system that already has a main controller, the range of options is what determines how easily the part attaches to an existing bus. ISP lets audio content be updated after a product is in volume production, from the host MCU, without changing the device — a detail that bears directly on part-number management wherever model variants and prompt variants multiply.

Where Nuvoton positions the part

Nuvoton lists home appliances (operation and completion prompts), security systems (alarms), medical equipment and industrial equipment (status feedback) among the target applications that need audible feedback and status notification.

What those settings share is a short listener distance, brief individual prompts, and equipment that often has no screen or only a small one. Because the prompts are brief, the fit between content volume and capacity matters: more prompt sounds and more language versions mean more storage, and the 69-to-315-second range is precisely the room to choose within.

Nuvoton did not disclose pricing, production timing or customer names in this announcement. The SB2340-HN30A evaluation board is the vendor's validation entry point, combining buzzer output, user key input and power management circuitry with support for USB Type-C or an external supply.

Sources

HSY Perspective

The constraint on upgrading a piezo buzzer is not the sound; it is the drive voltage and the content storage sitting outside the device, and the NSP2340BA24E folds both onto one die. A piezo element needs a drive voltage well above logic level to produce usable sound pressure, and voice content needs non-volatile storage; those two requirements have conventionally been met by a boost component and an external memory device, each consuming BOM cost and board area. Nuvoton's October 13, 2026 announcement describes integrated on-chip Flash, boost circuitry and a Class-AB output stage, with four booster outputs from 10 V to 24 V and a 69-to-315-second voice capacity. At selection time the variables to align therefore narrow to the drive-voltage step and the prompt duration the product needs, with external component count no longer growing as content gets longer.

The other variable is that audio content can be updated in system over ISP from the host MCU. Prompt sounds in appliances and security equipment are tied to model numbers, regional languages and localised wording; once content is fixed inside the device, changing a phrase means changing a part number. With host-side updates, one hardware platform can cover multi-language and multi-model prompt variants, and the cost of change moves from materials to firmware.

The boundary on this judgment rests on published functions and specifications: Nuvoton has not disclosed pricing, production timing or customer names, so what can be established is that the technical path works, not that it has displaced anything within a specific category. A piezo buzzer and a speaker are different loads — the first carrying brief, near-field status alerts, the second serving cases where volume and audio quality matter — and the I3810YYI HSY covered on September 30, 2026 addressed the speaker path while this device addresses the buzzer path. The forward-looking read: if the part drives mainstream piezo buzzers reliably across its 2.0 V to 5.5 V range, prompt-sound design in appliances and security products will fork — designs that keep their buzzer bill of materials gain the option of voice prompts without reselecting a speaker.