1SMB5951BT3

Single Zener Diodes Overview

The onsemi 1SMB5951BT3G is a single Zener voltage regulator diode in the SMB surface-mount package. It provides a nominal reverse Zener voltage of 120 V with a ±5% tolerance, measured at a test current of 3.1 mA. The device supports a maximum steady-state power dissipation of 3 W at 75°C and operates within a temperature range of -65°C to +150°C. Key electrical parameters include a maximum Zener impedance of 380 Ω at the test current, a maximum reverse leakage current of 1 µA at 91.2 V, and a forward voltage of 1.5 V at 200 mA.

Single Zener Diodes Feature Summary

• Flat handling surface designed for accurate automated placement
• Package design allows for top side or bottom circuit board mounting
• Modified L-bend leads provide increased contact area for bond pads
• Qualified for automotive applications under AEC-Q101 standards

Single Zener Diodes Applications

• Voltage regulation in automotive electronic systems
• Surge protection circuits requiring high-voltage clamping
• Industrial power supply reference voltage generation

Single Zener Diodes Procurement Notes

Verify that the specific part number suffix matches the required packaging configuration, as standard tape and reel quantities are typically 2500 units. Confirm RoHS compliance status and Pb-free designation if environmental regulations apply to the assembly process. Ensure the SZ prefix is selected only when unique site and control change requirements are mandated by the customer specification.

Single Zener Diodes Selection Notes

Select this component when a precise 120 V regulation point is required in a compact surface-mount footprint. Consider the thermal derating curve for ambient temperatures exceeding 75°C to ensure the 3 W rating is not exceeded. Verify that the 380 Ω dynamic impedance meets the noise sensitivity requirements of the target application circuit.

Single Zener Diodes Part Context

This device belongs to the 1SMB59xxBT3 series of 3 W plastic surface mount Zener diodes manufactured by onsemi. The series covers a wide voltage range from 3.3 V to 200 V, all utilizing the standardized SMB (DO-214AA) case 403A-03 package. The SZ1SMB59xxT3G variant specifically denotes automotive-grade qualification with enhanced quality controls.

Single Zener Diodes Replacement Considerations

Direct substitutes within the same series include 1SMB5950BT3G (110 V) and 1SMB5952BT3G (130 V). Cross-manufacturer equivalents must be verified against the SMB package dimensions and the 3 W power dissipation rating.