1N2974RB 10V 10W Zener Diode: Specs, Features, Uses, and Advantages
The 1N2974RB is a 10V 10W Zener diode made by Microsemi (now Microchip). 1N2974RB controls voltage and works well in tough places like factories, military, and space. This guide explains its features, uses, sizes, and why it's a good choice.
1N2974RB Overview
The 1N2974RB from Microsemi (now part of Microchip Technology) is a high-power Zener diode rated at 10V ±5% with a 10 W power dissipation, ideal for voltage regulation in demanding environments. Housed in a rugged DO 203AA (DO 4) stud-mount package, it offers excellent thermal performance and mechanical reliability.
The reverse polarity ("RB" suffix) means the cathode is connected to the stud, making it perfect for grounded-case applications. With a low dynamic impedance of 3 Ω, forward voltage of approximately 1.5 V, and a reverse leakage current of only 25 µA, this diode delivers stable and efficient performance. It is widely used in military, industrial, and high-reliability power systems, with a MIL-qualified variant available under the JAN1N2974RB designation.
If you are interested in purchasing the 1N2974RB, feel free to contact us for pricing and availability.
1N2974RB Features
• Zener Voltage - 10 V ± 5% nominal
• Power Dissipation - 10 Watts (with proper heat sinking)
• Polarity - Reverse polarity ("RB" suffix: cathode to stud/case)
• Package Type - DO-203AA (DO-4) stud mount
• Forward Voltage (Vf) - ~1.5 V at 2 A forward current
• Reverse Leakage Current - ~25 µA at specified test voltage
• Dynamic Impedance (Zzt) - Typically 3 Ω or less
• Thermal Resistance - ~10 °C/W (junction to case)
• Operating Temperature Range - –65 °C to +175 °C
• Mounting Style - Chassis/stud-mount for high thermal efficiency
• High-Reliability Option - JAN1N2974RB (MIL-PRF-19500/124 qualified)
1N2974RB Advantages & Disadvantages
Advantages of 1N2974RB:
High Power Handling – Rated at 10W, suitable for demanding power applications
Wide Operating Temperature Range – Performs reliably from –65 °C to +175 °C
Stud Mount Package – DO-4 style allows excellent heat dissipation and easy mounting
Reverse Polarity Option (RB) – Good for specific circuit design needs
±5% Voltage Tolerance – Ensures stable and precise voltage regulation
MIL-Qualified Variant Available – JAN1N2974RB meets military standards for high-reliability applications
Radiation Hardness – Inherently radiation-resistant, suitable for space and defense
ESD Resistant – Nonsensitive to static discharge per MIL-STD-750 Method 1020
Disadvantages of 1N2974RB:
Limited Voltage Options – Fixed Zener voltage (10 V), not adjustable
Requires Heat Sinking – Needs proper mounting to manage thermal load
Bulky Package – Stud-mount DO-4 is larger than surface-mount alternatives
Not Ideal for Low-Power Designs – Overkill for applications needing <1w power
1N2974RB Common Issues & Resolutions
Overheating - Ensure proper stud mounting with thermal grease and adequate heat sinking.
Incorrect polarity installation - Verify cathode-to-case polarity ("RB" version) before mounting.
Voltage instability - Add series resistor and verify input voltage stays within rated range.
Physical damage during mounting - Avoid excessive torque; follow recommended mounting procedures.
Poor regulation performance - Ensure correct Zener current and optimize circuit layout.
ESD damage during handling - Use ESD-safe tools and follow standard static discharge precautions.
1N2974RB Alternatives
1N2974B
1N2974A
1N2974RB Manufacturer
The 1N2974RB is made by Microsemi, which is now part of Microchip Technology, a well-known company that makes strong and reliable electronic parts. This Zener diode is designed for heavy-duty use, especially in military, space, and industrial equipment. Microsemi is known for making components that can handle tough conditions. The 1N2974RB comes in a metal stud mount and has reverse polarity, meaning the negative side is connected to the case. It also has a military-grade version called JAN1N2974RB, which meets strict quality standards.
Conclusion
The 1N2974RB is a great choice if you're needing stable voltage in heavy-duty systems. It's tough, works in extreme temperatures, and is trusted in military and industrial use. If you need a high-power Zener diode that lasts, this one's a smart pick.
WhatsApp:+852-69577225
Online