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DDZX18C-13 Equivalent & Substitute Parts
Part Overview
The DDZX18C-13 is an 18 V Zener diode manufactured by Diodes Incorporated, rated for 300 mW power dissipation in a surface mount SOT-23-3 package. This component is designed for voltage regulation and protection applications requiring stable reference voltage at 18 V nominal. The part is currently in active production status with 40,300 units in stock.
Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the specified parameter set. The DDZX18C-13 has a direct parametric equivalent available as DDZX18C-7, which shares identical electrical characteristics and packaging specifications.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Zener (Nominal) | 18 | V |
| Tolerance | ±3 | % |
| Power - Maximum | 300 | mW |
| Impedance (Maximum) | 23 | Ohms |
| Current - Reverse Leakage @ 14 V | 50 | nA |
| Voltage - Forward (Maximum) @ 10 mA | 900 | mV |
| Operating Temperature Range | -65 to 150 | °C |
| Mounting Type | Surface Mount | — |
| Package / Case | SOT-23-3 | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the DDZX18C-13 is determined by equivalence across the following critical parameters:
- Zener Voltage (Nominal): 18 V
- Voltage Tolerance: ±3%
- Power Rating: 300 mW
- Impedance (Maximum): 23 Ohms
- Reverse Leakage Current: 50 nA @ 14 V
- Forward Voltage: 900 mV @ 10 mA
- Operating Temperature Range: -65°C to 150°C
- Package Type: SOT-23-3 (TO-236-3, SC-59)
- Mounting Configuration: Surface Mount
- Compliance Status: ROHS3 Compliant, REACH Unaffected
The DDZX18C-7 is classified as a parametric equivalent because it maintains identical electrical specifications and mechanical compatibility with the DDZX18C-13 across all defined parameters. Both parts are manufactured by Diodes Incorporated under the same base product number DDZX18 and share the same supplier device package designation.
Parameter Comparison
| Parameter | DDZX18C-13 | DDZX18C-7 | Match |
|---|---|---|---|
| Manufacturer | Diodes Incorporated | Diodes Incorporated | Yes |
| Category | Diodes, Zener | Diodes, Zener | Yes |
| Voltage - Zener (Nominal) | 18 V | 18 V | Yes |
| Tolerance | ±3% | ±3% | Yes |
| Power - Maximum | 300 mW | 300 mW | Yes |
| Impedance (Maximum) | 23 Ohms | 23 Ohms | Yes |
| Current - Reverse Leakage @ 14 V | 50 nA | 50 nA | Yes |
| Voltage - Forward (Maximum) @ 10 mA | 900 mV | 900 mV | Yes |
| Operating Temperature Range | -65°C to 150°C | -65°C to 150°C | Yes |
| Mounting Type | Surface Mount | Surface Mount | Yes |
| Package / Case | SOT-23-3 | SOT-23-3 | Yes |
| Supplier Device Package | SOT-23-3 | SOT-23-3 | Yes |
| Product Status | Active | Active | Yes |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | Yes |
| Moisture Sensitivity Level | 1 (Unlimited) | 1 (Unlimited) | Yes |
| REACH Status | REACH Unaffected | REACH Unaffected | Yes |
Engineering Selection Recommendations
The DDZX18C-7 is a direct parametric equivalent to the DDZX18C-13 and is suitable for substitution in applications requiring an 18 V Zener diode with 300 mW power rating in SOT-23-3 surface mount packaging.
Both parts maintain active production status and carry identical compliance certifications: ROHS3 Compliant and REACH Unaffected. Both components are classified as Moisture Sensitivity Level 1 (Unlimited), indicating no special moisture handling requirements during storage or assembly.
Selection between DDZX18C-13 and DDZX18C-7 may be based on inventory availability. The DDZX18C-13 currently has 40,300 units in stock, while the DDZX18C-7 has 2,370 units available. Both parts are supplied in Tape & Reel (TR) packaging format suitable for automated assembly processes.
Frequently Asked Questions (FAQ)
Q: Can DDZX18C-7 be used as a direct replacement for DDZX18C-13?
A: Yes. The DDZX18C-7 is a parametric equivalent with identical electrical specifications and mechanical compatibility. All critical parameters including Zener voltage, power rating, impedance, leakage current, forward voltage, operating temperature range, and package type are equivalent.
Q: Are there any differences in compliance or certifications between these parts?
A: No. Both DDZX18C-13 and DDZX18C-7 carry identical compliance status: ROHS3 Compliant, REACH Unaffected, and Moisture Sensitivity Level 1 (Unlimited).
Q: What is the significance of the different part number suffixes (-13 versus -7)?
A: The suffix designates the packaging reel size or supplier-specific packaging configuration. Both parts are supplied in Tape & Reel (TR) format with SOT-23-3 package type. The electrical and mechanical specifications remain identical.
Q: Are both parts suitable for the same PCB assembly process?
A: Yes. Both parts use identical surface mount SOT-23-3 packaging and are compatible with standard automated pick-and-place assembly equipment and reflow soldering processes.
Q: What is the operating temperature range for these Zener diodes?
A: Both parts operate across -65°C to 150°C, suitable for industrial and automotive applications requiring extended temperature performance.
Q: How do the reverse leakage characteristics compare?
A: Both parts specify 50 nA reverse leakage current at 14 V, indicating equivalent leakage performance across the specified voltage range.
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