BZX84J-B27,115

Series:	Automotive, AEC-Q101
Packaging:	Tape & Reel (TR)
Part Status:	Active
Voltage - Zener (Nom) (Vz):	27V
Tolerance:	±2%
Power - Max:	550mW
Impedance (Max) (Zzt):	40 Ohms
Current - Reverse Leakage @ Vr:	50nA @ 18.9V
Voltage - Forward (Vf) (Max) @ If:	1.1V @ 100mA
Operating Temperature:	-65°C ~ 150°C
Mounting Type:	Surface Mount
Package / Case:	SC-90, SOD-323F
Supplier Device Package:	SOD-323F
Base Part Number:	BZX84JB27

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BZX84J-B27, 115 Application Field and Working PrincipleThe BZX 84J-B27, 115 is a Zener diode, a single diode chip, typically used to provide a reference voltage in consumer electronics and automotive systems. As a Zener diode, the BZX 84J-B27, 115 works by offerring a closed-circuit path for current to flow in the reverse direction, typically with a lower resistance than other components in the circuit, thereby allowing the current to be regulated.The application field of the BZX 84J-B27, 115 varies by subsystem. Automotive subsystems that use it for voltage reference typically include engine control units, transmission control units, body embedded electronics, brake systems, lamp controllers and alarm systems. In consumer electronics, it is usually used for surge protections, AC rectification, over-voltage suppressions, polarity protection, voltage regulation and other applications of voltage stabilization.Utalising a standard semi-conductor structure, the BZX 84J-B27, 115 operates when voltage drop, or a reverse bias, is applied across the PN junction. As this voltage becomes greater than the Zener voltage of the diode, the diode becomes forward-biased and current can flow in the reverse direction, creating a stable reference voltage in the circuit. The Zener voltage, or break-down voltage of the diode, is dependant on the doping level of the PN junction, the level of the reverse bias current and the amount of heat dissipated by the device. Therefore, in the BZX 84J-B27, 115, a low operating temperature and a low level of reverse bias current are designed to ensure stable operation and provide a strict control over the Zener voltage.When current is let through the diode, a voltage drop is observed due to the forward resistance of the diode. As the current increases further, this voltage drop increases accordingly with a linear slope and offset. This is known as the dynamic resistance, or dynamic impedance of the diode and is a key parameter for the overall stability of the device. The BZX 84J-B27, 115 is designed with a low dynamic resistance level to enable optimal performance.The BZX 84J-B27, 115 is equipped with a maximum Zener voltage of 115V, a maximum reverse bias current of 2.75mA and a dynamic resistance of 20W. The operating temperature range is -55’C to 150’C, including the difference in temperature coefficients between the circuit board and the diode itself. Furthermore, the device is housed in a mini SOT-23 package, a 3-lead flat package, which reduces circuit-board space and allows for a higher level of reliability and resistance to shock and vibration in applications.In summary, the BZX 84J-B27, 115 is a single diode chip, a Zener diode, typically used in automotive and consumer electronic subsystems for voltage reference and voltage stabilization. It supports a maximum Zener voltage of 115V, a maximum reverse bias current of 2.75mA and a dynamic resistance level of 20Ω. The device is housed in a mini SOT-23 package, which provides a high level of reliability.

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