BP1770C-0540 Mini Passive Piezo Buzzer — 17mm, 4kHz, 1–30 Vp-p, Only 5mA, Pin Mount

Key Features

• Ultra-Wide Drive Voltage 1–30 Vp-p — one model covers coin cells (1 V), 3.3 V / 5 V MCU GPIO, 12 V vehicle systems and 24–30 V industrial supplies; no level-shifting needed.

• Only 5 mA Current at 5 Vp-p — piezo elements are capacitive, not coils; they consume near-zero DC current, making this ideal for battery-powered IoT, wearables and remote sensors.

• 85 dB SPL at 10 cm (5 Vp-p) — clearly audible indoor alert tone; raise drive voltage to 12–24 Vp-p for even louder output.

• 4 kHz Resonant Frequency, MCU-Controlled Pitch — drive with a square wave at 4 kHz for maximum SPL; sweep frequency up or down to generate chimes, melodies and multi-tone alarms.

• Compact Φ17 × 7 mm Body — half the size of 30 mm panel buzzers; fits in tight PCBs, remote controls, toys and portable instruments.

• Through-Hole Pin Mount, 10.5 mm Pitch — two tin-plated brass pins on 10.5 mm spacing drop into standard PCB footprints; wave-solder friendly.

• Black PBT Housing — heat-resistant engineering plastic survives wave soldering and manual soldering without warping or discoloration.

• RoHS Compliant, -20 °C ~ +70 °C Operation — consumer/industrial temperature range.

Technical Specifications

Typical Applications

• Home Appliances — microwave ovens, rice cookers, washing machines, dishwasher finish signals

• Computing & Networking — PC motherboard POST beep, router fault alarm, switch status indicator, NAS alert

• Automotive Aftermarket — dashboard reminders, OBD dongles, parking sensors, EV chargers

• Toys & Education — electronic keyboards, talking books, educational robots, quiz buzzers

• Medical Devices — glucose meters, blood pressure monitors, pulse oximeters, portable monitors

• Industrial Instruments — multimeters, oscilloscopes, benchtop power supplies, PLC panel beepers

• Low-Power IoT — battery sensors, asset trackers, smart meters, wireless doorbells

Why Choose TAT BP1770C-0540?

1. One Buzzer for Every Voltage — 1 V to 30 Vp-p range eliminates SKU proliferation: no need to stock separate 3 V, 5 V, 12 V and 24 V buzzers.

2. Micro-Power for Battery Products — at just 5 mA peak and near-zero DC current, a coin cell can drive this buzzer for tens of thousands of alerts.

3. MCU Programmable Sound — because it's passive, your firmware can play multi-tone melodies, alarm patterns and frequency sweeps instead of a fixed beep.

4. PCB-Friendly Pins — 10.5 mm standard pitch and PBT housing tolerate wave soldering and rework without damage; no SMT placement needed.

5. Full OEM/ODM Flexibility — alternate resonant frequencies (2 kHz / 4 kHz / 8 kHz), longer pins, wire-lead versions, and connector options available.

Frequently Asked Questions

Q1: Is this buzzer active or passive? This is a passive piezo buzzer. You must feed an external square-wave drive signal at 4000 Hz (≈50% duty) from an MCU PWM pin or oscillator. Applying DC voltage will not produce sound.

Q2: How do I drive it from an MCU? Connect one pin to an MCU GPIO PWM output (4 kHz square wave at 3.3–5 V) and the other to GND. For louder output at higher voltages, use an NPN/MOSFET transistor stage or a half-bridge driver. The element is capacitive (15 nF), so current peaks are short.

Q3: Can I run it directly from 12 V or 24 V? Yes. The operating range is 1–30 Vp-p. At 12–24 Vp-p drive, SPL rises well above 85 dB — useful for high-noise environments. Add a current-limiting resistor if driving directly from a low-impedance source.

Q4: Why is it called "passive" and what does that mean for my design? Passive means the buzzer has no internal oscillator. Your firmware controls pitch by changing the square-wave frequency, letting you play multi-tone alarms, simple melodies and frequency sweeps — not just a fixed beep.

Q5: How loud is it at 5 V? At 5 Vp-p drive measured 10 cm away, output is ≥85 dB — comparable to an alarm clock or office voice announcement. At 12 Vp-p, expect roughly 90–95 dB.

Q6: Can I get it with wire leads instead of pins? Yes. Standard version is through-hole pins. We offer wire-lead versions, JST connector variants, and SMD versions on request — specify your assembly method when ordering.