SZBZX84C4V3LT3

Overview

The onsemi SZBZX84C4V3LT3G is a Zener voltage regulator diode housed in an SOT-23 surface-mount package. It provides a nominal Zener voltage of 4.3 V with a tolerance range of 4.0 V to 4.6 V at a test current of 5 mA. The device features a maximum dynamic impedance of 90 Ohms and a reverse leakage current of 3 µA at 1 V. It supports a total power dissipation of 250 mW on FR-4 or FR-5 boards and operates within a junction temperature range of -65°C to +150°C. The component is AEC-Q101 qualified, RoHS compliant, and lead-free.

Feature Summary

• Automotive-grade qualification with AEC-Q101 standards and PPAP capability for unique site and control change requirements.
• High-density surface-mount design in a compact SOT-23 package optimized for automated board assembly.
• Robust electrostatic discharge protection rated at Class 3 (> 16 kV) per the Human Body Model.

Applications

• Voltage regulation in cellular phones
• Power management in handheld portable devices
• Voltage clamping on high-density printed circuit boards

Procurement Notes

Verify the complete part number includes the suffix LT3G to confirm the specific tape and reel packaging quantity of 10,000 units. Confirm the SZ prefix indicates automotive-grade sourcing from a designated manufacturing facility. Ensure compliance with RoHS directives and lead-free specifications matches project environmental requirements before finalizing procurement orders.

Selection Notes

Select this component when a 4.3 V reference is required in space-constrained designs. The SZ prefix mandates adherence to automotive quality standards, making it suitable for applications requiring strict supply chain control. Compare the 250 mW thermal rating against PCB copper area availability to ensure adequate heat dissipation under continuous operating conditions.

Part Context

This device belongs to the BZX84CxxxLT1G/SZ series of low-power Zener diodes manufactured by onsemi. The series offers standardized breakdown voltages ranging from 2.4 V to 75 V in the ±5% tolerance class. The SZ prefix specifically denotes parts produced under automotive quality protocols, distinguishing them from standard commercial grade equivalents within the same electrical family.

Replacement Considerations

Direct functional substitutes include the BZX84C4V3LT1G and BZX84C4V3LT3G from onsemi. Cross-manufacturer alternatives such as the NXP BZX84C4V3 or Diodes Incorporated BZX84C4V3-7 share identical electrical parameters and SOT-23 pinouts but lack the specific automotive qualification associated with the SZ prefix.

FAQ

What is the pin configuration for the SZBZX84C4V3LT3G?

Pin 1 is the Anode, Pin 2 is No Connection, and Pin 3 is the Cathode.

Does the SZ prefix affect the electrical performance compared to the standard BZX84C series?

No, the SZ prefix indicates automotive-grade manufacturing and quality control but does not alter the electrical characteristics or pinout relative to the standard BZX84C series.

What is the maximum reverse leakage current specified for this device?

The maximum reverse leakage current is 3 µA when measured at a reverse voltage of 1 V.