The 1SMB5954BT3G from onsemi is a surface-mount Zener voltage-regulator diode with a 160V nominal Zener voltage, a specified voltage range of 152V to 168V, and a tolerance of ±5%. It supports up to 3W steady-state power dissipation under the specified thermal conditions, making it suitable for high-voltage regulation, clamping, reference, and protection circuits.
The device is characterized at a Zener test current of 2.3mA, with a maximum Zener impedance of 700Ω. Its maximum knee impedance is 6500Ω at 0.25mA, maximum reverse leakage current is 1μA at 121.6V, and maximum DC Zener current is 9mA.
The component is supplied in an SMB surface-mount package with the device marking 954B. It supports top- or bottom-side PCB mounting and has an operating and storage temperature range of -65°C to +150°C.
The “G” suffix identifies the lead-free version. The device is supplied in tape-and-reel packaging with 2,500 units per reel. The 3W rating applies under specified lead-temperature and thermal conditions; power derating must be considered for standard FR-4 PCB layouts.
Key Specifications:
- Manufacturer: onsemi
- Manufacturer Part Number: 1SMB5954BT3G
- Device Type: Zener Voltage-Regulator Diode
- Nominal Zener Voltage: 160V
- Zener-Voltage Range: 152V to 168V
- Voltage Tolerance: ±5%
- Maximum Power Dissipation: 3W under specified conditions
- Zener Test Current: 2.3mA
- Maximum Zener Impedance: 700Ω at 2.3mA
- Knee Test Current: 0.25mA
- Maximum Knee Impedance: 6500Ω
- Maximum Reverse Leakage: 1μA at 121.6V
- Maximum DC Zener Current: 9mA
- Maximum Forward Voltage: 1.5V at 200mA
- Package: SMB
- Device Marking: 954B
- Operating and Storage Temperature: -65°C to +150°C
- Mounting Type: Surface Mount
- Packaging: Tape and Reel
- Standard Reel Quantity: 2,500 Units
- Environmental Classification: Lead-Free
Typical Applications:
Suitable for high-voltage power regulation, output-voltage clamping, overvoltage protection, reference-voltage circuits, industrial controls, communication power supplies, and consumer electronics. Zener current, series resistance, PCB thermal design, and ambient-temperature derating should be verified in the final application.
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