CMPZDC15V BK - 15V 350mW Dual Zener SOT-23 | Central Semiconductor
MPN: CMPZDC15V BK β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.12 | $0.12 |
| 10 | $0.09 | $0.90 |
| 100 | $0.055 | $5.50 |
| 500 | $0.038 | $19.00 |
| 1,000 | $0.028 | $28.00 |
CMPZDC15V BK Overview
A dual Zener diode integrates two Zener junctions sharing a common terminal in a single three-pin package. In the common-cathode configuration, the shared cathode is tied to one pin while the two anodes form independent inputs, allowing bidirectional voltage clamping of a single node relative to two independent signal or supply lines. Dual Zeners occupy the same PCB footprint as a single transistor, making them a space-efficient sub-circuit within the broader diode and voltage-regulation hierarchy of discrete semiconductors.
Key features include the 350mW power dissipation rating, a tightly bounded 13.8V to 15.6V Zener window, and surface-mount construction compatible with automated pick-and-place assembly. The marking code CCY4 allows visual identification on the reel. The device is specified across the CMPZDC2V4 series range of 2.4V through 47V, letting engineers hold a single qualified footprint while scaling clamp voltage.
Technologically, the part uses a silicon planar Zener junction optimized for stable regulation and repeatable clamping behavior in industrial and commercial environments. Per the manufacturer, the CMPZDC2V4 series is described as a high-quality voltage regulator for industrial, commercial, entertainment and computer applications.
Typical applications include input protection clamps on data and control lines, voltage reference nodes for comparators and ADC thresholds, bias stabilization in analog front ends, and overvoltage protection in consumer entertainment and computer equipment.
A key design consideration is that the two Zener elements share one package's thermal budget: simultaneous conduction halves the per-junction power allocation, and derating must respect the 350mW package limit.
This page synthesizes datasheet parameters, same-series drop-in alternatives, and practical design notes not found in the raw manufacturer listing.
Drop-in alternatives for CMPZDC15V BK β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
CMPZDC15VA BK
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CMPZDC16V BK
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CMPZDC12V BK
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CMPZDC15V BK Maximum Ratings & Electrical Characteristics
| Configuration | Dual, Common Cathode |
| Zener Voltage (Nominal) | 15 V |
| Zener Voltage (Min) | 13.8 V |
| Zener Voltage (Max) | 15.6 V |
| Max Power Dissipation | 350 mW |
| Max Reverse Current IZM | 11 mA |
| Series | CMPZDC2V4 (2.4 V to 47 V) |
| Package | SOT-23 (TO-236AB) |
| Mounting Type | Surface Mount |
| Marking Code | CCY4 |
| Technology | Silicon Zener |
| Polarity | Common Cathode |
| Packaging | Tape and Reel |
CMPZDC15V BK Pin Configuration
| Pin 1 | Anode 1 β Anode of Zener element 1 |
| Pin 2 | Anode 2 β Anode of Zener element 2 |
| Pin 3 | Cathode (Common) β Shared common cathode of both Zener elements |
Typical Applications
CMPZDC15V BK is suitable for 6 applications: Input Overvoltage Protection, Comparator and ADC Threshold Reference, Differential Line Clamping, Power Supply Crowbar and OVP Sensing, Bias Stabilization in Analog Front Ends, Automated Assembly / Consumer PC Boards.
Input Overvoltage Protection
The CMPZDC15V BK clamps input lines that must never exceed roughly 15V above the shared reference, making it a natural front-end protector for industrial controllers and computer peripherals. Each 15V element (13.8V to 15.6V window) is placed from a signal or supply node to the common cathode rail; a series resistor sized so fault current stays under the 11mA IZM limit confines dissipation well inside the 350mW package budget. Because both elements share one SOT-23, two independent lines are protected with a single placement, cutting BOM lines versus discrete Zeners. For higher-energy transients, pair the Zener with a TVS stage, using the CMPZDC15V BK as the precise secondary clamp.
Recommended
Comparator and ADC Threshold Reference
Dual 15V common-cathode biasing suits threshold generation for comparators and level detectors in computer and entertainment equipment, the exact application domains Central Semiconductor targets for the CMPZDC2V4 series. The common cathode is tied to ground or a supply rail, and each anode node delivers a stable 15V offset reference; the 13.8V to 15.6V tolerance window is adequate for over-threshold detection, though precision references should instead trim with a resistor network or choose the tighter-tolerance VA grade. Since the dual package shares thermal mass, simultaneous loading of both elements should stay under half the 350mW rating each to keep drift low.
Recommended
Differential Line Clamping
In differential signaling protection, the two independent anodes of the CMPZDC15V BK clamp each leg of a differential pair to a common reference, holding both lines symmetrically within the 15V window. This topology preserves common-mode balance better than two separately-referenced single Zeners because both junctions share the same die and thermal environment, so their temperature-induced voltage shifts track closely. The SOT-23 footprint at 2.9mm x 1.3mm class dimensions keeps protection local to the connector, minimizing stub inductance; keep the common-cathode return path short and direct to the protection ground to maintain clamp fidelity during fast transients.
Recommended
Power Supply Crowbar and OVP Sensing
In low-cost power supplies for entertainment and commercial electronics, the CMPZDC15V BK functions as the fixed-threshold element in an overvoltage sensing network: when the monitored rail rises past the 13.8V lower bound of the Zener window, current through the element triggers a transistor or SCR latch. The 11mA IZM limit defines how hard the sensing node can be pulled, so a series resistor of a few kilohms typically interfaces the Zener to the trigger device. Dual elements allow redundant sensing of the same rail or monitoring of two independent outputs from one placement, simplifying multi-rail protection layouts.
Recommended
Bias Stabilization in Analog Front Ends
Analog front ends in industrial and audio-entertainment equipment use the CMPZDC15V BK to bias input stages or set cascode voltages that must remain stable against supply variation. Silicon Zener junctions provide a repeatable 15V drop largely independent of supply swings, and the common-cathode package lets a designer derive two identical bias points from one component, improving matching between channels. Note that Zener dynamic impedance at low test current adds noise; in very low-noise front ends, operate the element well above its knee current and consider a post-filter. Verify the datasheet IZT and Zzt figures when calculating noise and regulation performance.
Recommended
Automated Assembly / Consumer PC Boards
The tape-and-reel SOT-23 format with CCY4 marking makes the CMPZDC15V BK a drop-in choice for high-volume pick-and-place assembly in computer and commercial products. One component replaces two discrete Zeners and their two placements, reducing placement count, reel consumption, and inspection overhead; the marking code supports automated optical verification. Because the CMPZDC2V4 series spans 2.4V to 47V in the identical footprint, contract manufacturers can hold a single qualified land pattern and swap voltage variants per product revision without stencil or layout changes, which shortens qualification cycles for derivative products and simplifies component engineering standards.
Recommended
Recommended Products Summary
Engineering reference data for CMPZDC15V BK β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | CMPZDC15VA BK | CMPZDC13V BK | CMPZDC16V BK | CMPZDC12V BK |
|---|---|---|---|---|---|
| Package | SOT-23 (TO-236AB) | SOT-23 (TO-236AB) - same | SOT-23 (TO-236AB) - same | SOT-23 (TO-236AB) - same | SOT-23 (TO-236AB) - same |
| Brand | Central Semiconductor | Central Semiconductor | Central Semiconductor | Central Semiconductor | Central Semiconductor |
| Configuration | Dual, Common Cathode | Dual, Common Cathode | Dual, Common Cathode | Dual, Common Cathode | Dual, Common Cathode |
| Nominal Zener Voltage | 15 V | 15 V | 13 V | 16 V | 12 V |
| Power Dissipation | 350 mW | 350 mW | 350 mW | 350 mW | 350 mW |
| Max IZM | 11 mA | 11 mA | 11 mA | 11 mA | 11 mA |
| Primary Use Case | 15V clamp / reference | 15V clamp, tighter tolerance | 13V clamp / reference | 16V clamp / reference | 12V clamp / reference |
Key Differentiators
- Two precision clamps in one placement (vs BZX84C15 (single Zener))
- Footprint-stable voltage family (vs CMPZDC13V BK / CMPZDC16V BK)
- Honest trade-off: modest precision window (vs TL431 shunt reference)
Design Notes
Do not confuse common-cathode and common-anode dual Zeners: both use the same SOT-23 footprint, but the shared terminal sits on a different pin, so substituting a common-anode family part will place the clamp to the wrong rail and typically fail open or short the node. Verify pin 3 is the shared cathode in your layout and on the incoming part. Also, 350mW is a package-level limit shared by both elements - two simultaneously conducting clamps must each stay near half that budget.
Series-limit the protected node so fault current never exceeds the 11mA IZM figure. Estimated: with a 24V fault into a 15V clamp, a 1k resistor limits current to (24-15)/1000 = 9mA, dissipating about 81mW in the Zener - comfortably within the 350mW rating. Without a series element, the clamp will absorb uncontrolled current and exceed its rating. Cross-check the derating curve in the manufacturer datasheet at your maximum ambient temperature before finalizing resistor values.
Place the CMPZDC15V BK directly at the connector or node being protected; every millimeter of trace between the clamp and the victim pin adds inductance that degrades transient clamp performance. Provide a short, wide return trace from pin 3 (common cathode) to the reference ground or rail. The 13.8V to 15.6V tolerance window means circuit thresholds should be designed with at least 1V margin on the low side and verified against the high-side 15.6V bound.
Compliance Information
Compliance data was not present in the verified web data. Confirm RoHS/REACH status on the Central Semiconductor product page (my.centralsemi.com) before specifying in regulated markets.
