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MMSZ5248BT1G

18V 500mW Zener diode, SOD-123, AEC-Q101, 5% tol

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Pieza del fabricante：

MMSZ5248BT1G

Paquete：

SOD-123 (2.69 x 1.6 x 1.16 mm)

Marca：
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Descripción

Productos

The MMSZ5248BT1G from onsemi is an 18V 500mW surface-mount Zener voltage regulator diode in a SOD-123 package. With 5% tolerance, 21 Ohm max Zener impedance, 0.1uA max leakage, and AEC-Q101 qualification, it provides reliable voltage regulation and protection in general-purpose and automotive applications.

Especificaciones

Zener Voltage (VZ) 18V nominal (17.1V to 18.9V, +/-5%)
Zener Impedance (ZZT) 21 Ohm max @ IZT = 7mA
Test Current (IZT) 7 mA
Reverse Leakage Current 0.1 uA max @ VR = 13.7V
Forward Voltage (VF) 0.9V max @ IF = 10mA
Power Dissipation 500 mW (on FR-4/FR-5 board)
Temperatura de funcionamiento -55 to +150 C (junction)
ESD Rating Class 3 (>16kV HBM)
AEC-Q101 Qualified
Paquete SOD-123 (2.69 x 1.6 x 1.16 mm)
Status Activo
RoHS Yes, Pb-free
Embalaje Tape and reel, 3000 pcs/reel

Características

  • 18V Zener voltage with +/-5% tolerance
  • 500mW power dissipation in SOD-123
  • Low Zener impedance: 21 Ohm max
  • Ultra-low reverse leakage: 0.1uA
  • AEC-Q101 qualified for automotive
  • ESD Class 3 (>16kV HBM)
  • Wide operating temperature: -55 to +150C
  • Pb-free, RoHS compliant

Aplicaciones

  • Voltage regulation and referencing
  • Overvoltage protection
  • Automotive electronics
  • Industrial control circuits

The MMSZ5248BT1G from onsemi is an 18V 500mW surface-mount Zener voltage regulator diode in a SOD-123 package. The 5248 in the part number encodes the Zener voltage (18V per the 1N5248B industry standard), B denotes +/-5% tolerance, T1 indicates tape and reel packaging, and G denotes Pb-free (RoHS compliant). The device operates in the reverse breakdown region, maintaining a stable 18V across its terminals when biased at the test current of 7mA. The 21 Ohm maximum Zener impedance at IZT ensures relatively tight voltage regulation under varying load conditions. The maximum reverse leakage current of only 0.1uA at 13.7V (below breakdown) minimizes power loss when the device is not in regulation. The 500mW power dissipation rating on FR-4/FR-5 PCB allows the device to handle up to 27mA of Zener current at 18V. AEC-Q101 qualification makes this device suitable for automotive applications. The SOD-123 package provides a good balance between small footprint and power handling, with the MMSZ series covering Zener voltages from 2.4V to 110V.

The MMSZ5248BT1G operates as a Zener voltage regulator: (1) Reverse Breakdown: When a reverse voltage exceeding the Zener breakdown voltage (18V) is applied, the diode enters the breakdown region. In this region, the current increases dramatically for small voltage changes, effectively clamping the voltage across the device near 18V. The actual Zener voltage is 17.1V to 18.9V (at IZT=7mA) due to the +/-5% tolerance. (2) Voltage Regulation: In a typical shunt regulator circuit, a series resistor connects the input supply to the Zener diode and load in parallel. The Zener absorbs current variations to maintain a constant output voltage. The regulation accuracy depends on the Zener impedance (21 Ohm max) and the source impedance. For a change in Zener current of delta-IZ, the output voltage changes by delta-VZ = ZZT x delta-IZ. (3) Forward Conduction: Like any diode, the device conducts in the forward direction with 0.9V max at 10mA, but this mode is not used in normal Zener regulator operation. (4) Thermal Considerations: Power dissipated in the Zener (VZ x IZ) generates heat that raises the junction temperature. The 500mW rating assumes proper PCB thermal design with FR-4 board and adequate copper area. Above the rated power, the Zener voltage drifts with temperature (positive temperature coefficient for voltages above approximately 5V).

Pin Nombre Tipo Descripción
1 Cátodo Passive Positive terminal (reverse bias)
2 Ánodo Passive Negative terminal (ground in shunt config)
  • 18V shunt voltage regulator for a 24V industrial supply rail, series resistor sets 5mA Zener current, output regulated to 17.1-18.9V with 21 Ohm impedance
  • Overvoltage protection for an 18V-rated MOSFET gate, Zener clamps gate voltage to 18V preventing oxide breakdown from transient spikes
  • Automotive 18V reference voltage using AEC-Q101 qualified device with 0.1uA leakage and >16kV ESD protection
  • ADC reference voltage divider with 18V Zener providing stable reference from a 24V supply in an industrial sensor interface
Modelo Fabricante VZ Potencia Notas
MMSZ5248B-7-F Diodos Inc 18V 500mW SOD-123, equivalent
BZX84C18-7-F Diodos Inc 18V 300mW SOT-23, lower power
1N5248B-TR onsemi 18V 500mW DO-35, through-hole
MMSZ5249BT1G onsemi 19V 500mW Next voltage in series
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