TAT BP2270C-40 High-Temperature Passive Piezo Buzzer — 22*7.0mm, 4kHz, 1–30Vp-p, Rated to 120°C

Key Features

• Rated to +120 °C Continuous Operation — PPO housing and ceramic element withstand far higher temperatures than standard buzzers (typically capped at 70 °C); ideal for ovens, sterilizers, engine compartments and heated equipment.

• 1–30 Vp-p Ultra-Wide Drive Range — one element drives from a 1 V coin cell through 3.3/5 V MCU GPIO up to 12/24/30 V industrial rails; no voltage regulator or level shifter needed.

• Only 3 mA Current at 5 Vp-p — piezoelectric ceramics are capacitive, consuming near-zero DC power; perfect for battery-powered sensors and low-IoT nodes.

• 4 kHz Resonant Frequency, MCU-Programmable Pitch — feed a square wave at 4 kHz for peak 85 dB SPL; sweep frequency in firmware to generate chimes, melodies and multi-tone alarms instead of a fixed beep.

• ≥85 dB SPL at 10 cm (5 Vp-p) — clearly audible indoor and panel-level alert tone; raise drive voltage toward 30 Vp-p for louder output.

• Φ22 × 7 mm Standard Footprint, Pin Mount — industry-standard 22 mm round body with 4.0 mm through-hole pins drops into existing PCB footprints and replaces most generic 22 mm passive piezo elements.

• Black PPO Heat-Resistant Housing — polyphenylene oxide resin resists soldering heat, thermal aging and warping at elevated temperatures.

• RoHS Compliant, -30 °C ~ +120 °C Storage — industrial-grade temperature range.

Technical Specifications

Typical Applications

• High-Temperature Equipment — industrial ovens, microwave ovens, air fryers, drying cabinets, sterilizers, welding machines

• Automotive — engine-bay alarms, dashboard reminders, OBD dongles, aftermarket reverse/parking buzzers (heat-tolerant)

• Industrial Panels — PLC fault alarms, VFD drivers, temperature controllers, control-cabinet beepers

• Home Appliances — oven, rice cooker, microwave and dishwasher end-of-cycle signals

• Security & Fire — door access panels, smoke detectors, perimeter alarm low-cost sounders

• Networking — router fault alerts, switch status beepers, optical-network terminals

• Low-Power IoT — battery sensor nodes, asset trackers, smart meters (near-zero quiescent current)

Why Choose TAT BP2270C-40?

1. Built for Heat Where Others Melt — the 120 °C rating and PPO housing make this element usable inside ovens and engine bays where a 70 °C consumer buzzer deforms, fails or smells.

2. Micro-Power 3 mA — capacitive piezo draws almost no DC current; a coin cell drives tens of thousands of alerts with negligible battery drain.

3. One Element for All Voltages — 1 to 30 Vp-p range eliminates stocking separate 3 V, 5 V, 12 V and 24 V SKUs.

4. Firmware-Controlled Sound — passive design lets MCU firmware play multi-tone chimes and melodies, not just a fixed beep.

5. Full OEM/ODM Flexibility — alternate resonant frequencies (2 kHz / 4 kHz / 8 kHz), custom pin length, wire-lead and connector variants, and higher-temperature builds available.

Frequently Asked Questions

Q1: Is this buzzer active or passive? This is a passive piezoelectric element. Feed an external square wave at 4000 Hz (≈50% duty) from an MCU PWM pin or oscillator; DC voltage alone produces no sound.

Q2: What makes this suitable for high-temperature environments? The PPO housing and ceramic element are rated -20 °C to +120 °C continuous, versus ~70 °C for standard buzzers — it holds up in ovens, drying chambers and engine compartments.

Q3: How do I drive it from an MCU? Connect one pin to a GPIO PWM output (4 kHz, 3.3–5 V square wave) and the other to GND. For 12–30 Vp-p drive, use an NPN/MOSFET or half-bridge stage with a current-limiting resistor.

Q4: How loud is 85 dB? At 5 Vp-p measured 10 cm away, 85 dB is comparable to an alarm clock or clear office announcement. Raising drive voltage toward 30 Vp-p increases SPL further.

Q5: Do you offer wire-lead or SMD versions? Yes. Standard is through-hole pins; wire-lead, JST connector and SMD variants are available on request — specify your assembly method.