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Added 15 New Products to the Lineup of Zener Diodes for Surge Protection of Power Lines Help to Improve Equipment Reliability
Toshiba Electronic Devices & Storage Corporation ("Toshiba") has launched 15 products in the “CMZBxxA series” of Zener diodes, which protect power lines of semiconductor devices and equipment from switching surges and overvoltage with long pulse width and characteristics close to DC.
The new CMZBxxA series products feature a planar structure and are designed as successors to the mesa-structured CMZBxx series products, which have been announced for EOL. (Please refer to the structural features below.) Compared to the CMZBxx series, the new products improve the specification range of Zener voltage (typ.) from ±10% to ±5%, making it easier to design voltage margins. Additionally, the reverse current (max) is reduced from 10μA to 0.5μA, lowering power consumption during standby. These improvements help simplify equipment design and lower power consumption. Furthermore, the use of the same package as the CMZBxx series ensures easy replacement.
The 15 products in the lineup cover a range of Zener voltage (typ.) from 12V to 51V, supporting major power lines. The expanded lineup supports various voltage lines.
These new products help to improve equipment reliability by providing surge protection for power supply lines.
Features
- Surge protection from switching surges and overvoltage pulses with long pulse width and characteristics close to DC.
- Zener voltage for major power lines: VZ (typ.)=12V to 51V
- Specification range of high-precision Zener voltage: 5% (typ.)
- Low reverse current: IR (max)=0.5μA
Features Explanation
1. Surge protection from switching surges and overvoltage pulses with long pulse width and characteristics close to DC.
The new products feature protection not only against transient overvoltage pulses, but also against overvoltage pulses with long pulse width and characteristics close to DC, which are difficult for ESD protection diodes to handle. In power lines of equipment, switching surges with long pulse widths of up to milliseconds may be generated when the circuit switches. The new products help protect semiconductor devices from switching surges and overvoltage close to DC.
2. Zener voltage for major power lines: VZ (typ.)=12V to 51V
With a wide lineup of Zener voltages ranging from 12V to 51V, the lineup supports a variety of applications, including consumer and industrial equipment.
3. Specification range of high-precision Zener voltage: ±5% (typ.)
With a planar structure enabling fine-tuning of the process, the new products improve the Zener voltage specification range of Zener voltage (typ.) from ±10% to ±5% compared to the existing CMZBxx series. This allows for design within a narrower voltage range, making it easier to select components and adjust circuit constants, thereby contributing to simplified equipment design.
4. Low reverse current: IR (max)=0.5μA
Since Zener diodes are typically connected to power lines continuously, lower reverse current helps lower power consumption during standby. By protecting the PN junction with an oxide film through a planar structure, the CMZBxxA series achieves a low reverse current of 0.5μA (max), compared to 10μA for the existing CMZBxx series. This contributes to low power consumption in equipment.
Applications
- Consumer equipment (home appliances, power supplies, etc.)
- Industrial equipment (OA equipment, power supplies, etc.)
Main Specifications
(Unless otherwise specified, Ta=25°C)
| Part number | Package | Zener voltage VZ (V) | Dynamic resistance rd (Ω) | Reverse current IR (μA) | Sample check & availability |
||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Name | Size (mm) | Min | Typ. | Max | Test current IZ (mA) | Max | Test current IZ (mA) | Max | Test voltage VR (V) | ||
| Typ. | |||||||||||
| CMZB12A | M-FLATTM | 2.4×4.7×0.98 | 11.40 | 12.00 | 12.60 | 10 | 20 | 10 | 0.5 | 8.0 |  |
| CMZB13A | 12.35 | 13.00 | 13.65 | 10 | 20 | 10 | 0.5 | 9.0 | |
||
| CMZB15A | 14.25 | 15.00 | 15.75 | 10 | 20 | 10 | 0.5 | 10.0 | |
||
| CMZB16A | 15.20 | 16.00 | 16.80 | 10 | 20 | 10 | 0.5 | 11.0 | |
||
| CMZB18A | 17.10 | 18.00 | 18.90 | 10 | 20 | 10 | 0.5 | 13.0 | |
||
| CMZB20A | 19.00 | 20.00 | 21.00 | 10 | 20 | 10 | 0.5 | 14.0 | |
||
| CMZB24A | 22.80 | 24.00 | 25.20 | 10 | 20 | 10 | 0.5 | 17.0 | |
||
| CMZB27A | 25.65 | 27.00 | 28.35 | 10 | 20 | 10 | 0.5 | 19.0 | |
||
| CMZB30A | 28.50 | 30.00 | 31.50 | 10 | 20 | 10 | 0.5 | 21.0 | |
||
| CMZB33A | 31.35 | 33.00 | 34.65 | 10 | 20 | 10 | 0.5 | 26.4 | |
||
| CMZB36A | 34.20 | 36.00 | 37.80 | 9 | 20 | 9 | 0.5 | 28.8 | |
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| CMZB39A | 37.05 | 39.00 | 40.95 | 8 | 30 | 8 | 0.5 | 31.2 | |
||
| CMZB43A | 40.85 | 43.00 | 45.15 | 7 | 30 | 7 | 0.5 | 34.4 | |
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| CMZB47A | 44.65 | 47.00 | 49.35 | 6 | 50 | 6 | 0.5 | 37.6 | |
||
| CMZB51A | 48.45 | 51.00 | 53.55 | 6 | 50 | 6 | 0.5 | 40.8 | |
||
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