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MMSZ5263BT1G

56V 500mW Zener diode, ±5%, 150Ω Zzt, 100nA leakage, SOD-123

15800

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Manufacturer Part：

MMSZ5263BT1G

Package：

SOD-123 (2.69 x 1.60mm)

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Description

Product Overview

The MMSZ5263BT1G from ON Semiconductor is a 500mW Zener voltage regulator diode with a nominal Zener voltage of 56V (±5% tolerance), 150Ω maximum Zener impedance, and 100nA reverse leakage at 43V. Housed in a compact SOD-123 surface-mount package, it provides general-purpose voltage regulation and reference for medium-current applications.

Key Specifications

  • Zener Voltage (VZ): 56V nominal (53.2V~58.8V @ IZT=2mA)
  • Tolerance: ±5%
  • Power Dissipation: 500mW on FR-4 board @ TL=75°C
  • Zener Impedance (ZZT): 150Ω max @ IZT=2mA
  • Zener Impedance (ZZK): 1500Ω @ IZK=0.25mA
  • Reverse Leakage (IR): 100nA max @ VR=43V
  • Forward Voltage (VF): 0.9V max @ IF=10mA
  • Temperature Coefficient: ~+55mV/°C typical (above 47V)
  • Thermal Resistance: 340°C/W (junction-to-ambient)
  • Operating Temperature: -55°C ~ +150°C
  • ESD Rating: Class 3 (>16kV HBM)
  • Package: SOD-123 (2.69 x 1.60mm)
  • Compliance: RoHS, Pb-free, AEC-Q101 (SZ prefix)

Features

  • Compact SOD-123 package for high-density PCBs
  • 500mW power rating on standard FR-4 board
  • Wide Zener voltage range in MMSZ52xxx series (2.4V~110V)
  • Pb-free construction
  • ESD Class 3 rating (>16kV HBM)
  • AEC-Q101 qualified (SZMMSZ prefix)

Applications

  • Voltage regulation and reference
  • Overvoltage protection
  • Level shifting and clamping
  • Switching power supply auxiliary bias
  • Consumer electronics power management

The MMSZ5263BT1G from ON Semiconductor is a 56V Zener voltage regulator diode in a compact SOD-123 surface-mount package. The 500mW power rating is adequate for low-power bias and reference applications. The 56V Zener voltage with ±5% tolerance is commonly used in auxiliary bias circuits for switching power supplies, where it provides a stable reference voltage derived from the high-voltage DC bus through a series resistor. The SOD-123 package is significantly smaller than the traditional DO-41/DO-35 through-hole alternatives, enabling higher component density on modern PCBs. The BT1G suffix indicates ±5% tolerance and tape-and-reel packaging. The broader MMSZ52xxxT1G series covers Zener voltages from 2.4V to 110V in the same package footprint.

The MMSZ5263BT1G operates in the reverse breakdown (Zener/avalanche) region. When reverse-biased above the Zener voltage (56V nominal), the device conducts current while maintaining a relatively constant voltage across its terminals. At 56V, the primary breakdown mechanism is avalanche multiplication rather than the Zener tunneling effect (which dominates below approximately 5V). The avalanche breakdown occurs when the electric field in the depletion region accelerates carriers to sufficient energy to create electron-hole pairs through impact ionization, creating a self-sustaining multiplication chain. The relatively high 150Ω Zener impedance at 56V reflects the soft knee characteristic of high-voltage Zener diodes, meaning the terminal voltage varies with current more than low-voltage Zeners. A series current-limiting resistor is always required to prevent excessive power dissipation.

Pin Name Function
1 Cathode Marked with polarity band; connect to positive for reverse bias
2 Anode Connect to negative for reverse bias operation

The MMSZ5263BT1G is commonly used in the bias circuit of off-line switching power supplies, where the 56V Zener provides a stable reference for the VCC supply of PWM controllers. When connected across the VCC rail through a current-limiting resistor, it clamps the VCC to approximately 56V, preventing overvoltage damage to the controller. For overvoltage protection circuits, the 56V threshold detects when the output voltage exceeds safe limits. In level shifting applications, it converts a high-voltage signal to a regulated lower voltage for ADC input protection. The high ESD rating (>16kV HBM) provides additional ruggedness during assembly and operation.

Model Manufacturer Key Difference
1N5263BTR ON Semiconductor 56V 500mW, DO-41 through-hole
BZX84C56LT1G ON Semiconductor 56V 250mW, SOT-23 package
MMSZ5263BT1G Diodes Inc Same spec, different manufacturer
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