MMSZ5251BT1G

MMSZ5251BT1G is a small-signal, surface-mount Zener diode from On Semiconductor (MMSZ series). It provides a fixed Zener breakdown voltage of about 5.1 V for regulation or clamping in low-power circuits.
Key points:
- Zener voltage: ~5.1 V (with ±5% tolerance, B)
- Package: small SMT (MMSZ family; T1G denotes RoHS-compliant packaging)
- Power rating: around 0.5 W (at 25°C ambient)
- Configuration: two-terminal, reverse-biased to regulate or clamp at ~5.1 V
- Typical uses: voltage regulation/reference, overvoltage protection, input clamping in consumer electronics and power rails
How to use:
- In regulation: place resistor and diode in reverse bias to establish ~5.1 V across the diode.
- In clamping: connect to the line you want protected; it clamps at ~5.1 V.
For exact electrical specs (dynamic impedance, test current, max reverse current), consult the MMSZ5251BT1G datasheet.

Do you mean the ON Semiconductor MMSZ5251BT1G Zener diode? I can list direct equivalents, but I need to confirm the required specs (Zener voltage, power rating, package — e.g., 6.2 V, 0.5 W, SOD‑523). Please confirm or tell me which spec you care about.

MMSZ5251BT1G features:
- Zener diode with 5.1 V nominal Zener voltage
- Tolerance: ±5% (B-series)
- Power rating: 0.5 W
- Surface-mount MMSZ (SOD-123) package
- Tape & Reel variant (T1G), RoHS-compliant
- Operating temperature range: roughly -55°C to +125°C
- Suitable for voltage regulation, reference, and transient/clamp applications
Note: Always verify exact packaging and tolerance from the specific datasheet revision.

MMSZ5251BT1G is a 2‑pin SMD Zener diode (pins: anode and cathode). Its function is voltage regulation/clamping and over‑voltage protection—providing a defined Zener breakdown voltage as a reference or transient/surge clamp in electronic circuits.

Manufacturer: ON Semiconductor (onsemi).
What kind of company: Onsemi is a global semiconductor manufacturer and supplier that designs and sells discrete and analog components, power-management ICs, sensors and related semiconductor solutions for automotive, industrial, communications and consumer markets.

- Low‑power voltage regulation and reference in portable devices
- Overvoltage protection and clamping for ICs, rails and interfaces
- Transient suppression and ESD protection on data/signal lines (USB, HDMI, I/O)
- Shunt regulator in compact power supplies
- Protection for automotive/industrial electronics within its rated voltage range

The MMSZ5251BT1G is packaged in a SOD-523 (small surface-mount) package, supplied on tape and reel (T1G).