MMSZ5257BT1G

The MMSZ5257BT1G is ON Semiconductor’s MMSZ family Zener diode. It’s a small, surface‑mount, unidirectional Zener used for voltage regulation, voltage clamping, and protection in low‑power circuits. The device is in the MMS (SOD‑123 style) package; the T1G suffix denotes RoHS compliance with Tape & Reel packaging. The nominal Zener voltage is about 5.7 V (5257B), with a typical power rating around 0.5 W at 25°C and a Zener tolerance of roughly ±5% (B grade). Applications include reference generation, regulator/clamp circuits, and transient protection in power supplies and microcontroller circuitry. For exact specs—I–V characteristics, knee current, Zener impedance, maximum reverse current, and detailed packaging data—consult the MMSZ5257BT1G datasheet.

Assuming MMSZ5257BT1G is the 5.7 V, 0.5 W Zener in SOD-123:
- Vishay: BZT52H-C5V7
- Nexperia (formerly NXP): BZT52H-C5V7
- Diodes Inc.: BZT52H-C5V7
SOT-23 equivalents (same voltage): BZX84-C5V7 (Vishay/Nexperia). Check tolerance and packaging for exact match.

Here are the key features of MMSZ5257BT1G:
- Zener diode with nominal Zener voltage Vz ≈ 5.7 V
- Power rating: 0.5 W (at 25°C)
- Surface-mount device (MMSZ/SMD) package
- Tolerance: ±5% on Zener voltage
- RoHS compliant (lead-free)
- Temperature range: approximately -55°C to 125°C
- Intended use: voltage regulation, reference/clamping in low-power circuits
Note: For exact specs (min/max values, leakage, dynamic impedance), consult the official datasheet.

MMSZ5257BT1G is a two-pin (anode and cathode) device. It is a Zener diode used for voltage reference/regulation and transient/clamping protection (provides a defined breakdown voltage in reverse bias).

The MMSZ5257BT1G is manufactured by onsemi (formerly ON Semiconductor). onsemi is an American semiconductor company that designs and supplies discrete semiconductors, power-management and analog ICs, sensors and connectivity solutions for automotive, industrial, computing and consumer markets.

MMSZ5257BT1G is a small-signal Zener diode. Common application areas include:
- Low-power shunt regulation and voltage reference in microcontrollers, sensors, and analog circuits
- Voltage clamping and overvoltage protection on power rails and signal lines
- Biasing/reference networks in precision ADC/DAC and other analog ICs
- Simple transient/level‑shift protection in consumer electronics, automotive, and telecom gear
These use cases leverage its stable Zener voltage for regulation and protection in compact, low-current designs.

SOD-123 surface-mount package.