DDZ27ASF-7 Equivalent & Substitute Parts

Part Overview

The DDZ27ASF-7 is a Zener diode manufactured by Diodes Incorporated, rated at 24.89 V nominal with 500 mW maximum power dissipation in a surface mount SOD-323F package. This component is designed for voltage regulation and protection applications requiring precise Zener voltage characteristics in compact form factors.

The DDZ27ASF-7 is discontinued at DiGi Electronics. Locating equivalent or substitute components is necessary to support ongoing production requirements, maintenance operations, and design continuity where this specific part number is no longer available through primary distribution channels.

Substiute Parts

DDZ27ASF-7

Diodes IncorporatedIn Stock: 33457DDZ27ASF-7 Datasheet

Current PartRFQ

MMXZ5253C-TP

Micro Commercial CoIn Stock: 1028MMXZ5253C-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DDZ27ASF-7 is determined by alignment across the following critical parameters:

Zener Voltage Compatibility: The nominal Zener voltage must fall within the operational tolerance band of the original specification. The DDZ27ASF-7 operates at 24.89 V ±3%, establishing a functional range of 24.14 V to 25.64 V.

Power Dissipation Capability: The substitute component must support the maximum power rating of the application. The DDZ27ASF-7 is rated for 500 mW maximum power dissipation.

Package and Mounting: Surface mount compatibility and physical package dimensions determine mechanical fit and assembly compatibility. The DDZ27ASF-7 uses SOD-323F packaging.

Operating Temperature Range: The substitute must support the full operating temperature envelope of -65°C to 150°C.

Electrical Characteristics: Forward voltage, reverse leakage current, and impedance parameters must be compatible with circuit design requirements.

Regulatory Compliance: RoHS3 compliance and REACH status must be maintained for applications subject to these requirements.

Parameter Comparison

Engineering Selection Recommendations

MMXZ5253C-TP Substitution Criteria:

The MMXZ5253C-TP is an active product from Micro Commercial Co and represents a viable substitute for the discontinued DDZ27ASF-7 based on the following factors:

Voltage Alignment: The MMXZ5253C-TP nominal Zener voltage of 25 V falls within the acceptable tolerance band of the DDZ27ASF-7 (24.14 V to 25.64 V at ±3%). The substitute offers ±2% tolerance, providing tighter voltage regulation.

Package Compatibility: Both components use SOD-323 family packaging for surface mount applications, ensuring mechanical and assembly compatibility.

Regulatory Status: The MMXZ5253C-TP maintains REACH Unaffected status, consistent with the original part. RoHS compliance status for the substitute is not specified in the provided data.

Operational Limitations: The MMXZ5253C-TP is rated for 200 mW maximum power dissipation, compared to 500 mW for the DDZ27ASF-7. Applications requiring power dissipation above 200 mW must be evaluated against actual circuit demands. The substitute also has a narrower low-temperature operating range (-55°C minimum versus -65°C minimum), which may affect suitability for extreme cold-temperature applications.

Availability: The MMXZ5253C-TP is currently active with 952 pieces in stock, providing immediate availability compared to the discontinued status of the original part.

Frequently Asked Questions (FAQ)

Q: Can the MMXZ5253C-TP directly replace the DDZ27ASF-7 in all applications?

A: Direct replacement depends on application-specific power dissipation and temperature requirements. The MMXZ5253C-TP has a lower maximum power rating (200 mW versus 500 mW) and a narrower low-temperature operating range (-55°C versus -65°C). Applications operating within these constraints are compatible; those exceeding these limits require alternative solutions.

Q: What is the voltage difference between these two parts?

A: The DDZ27ASF-7 is rated at 24.89 V nominal, while the MMXZ5253C-TP is rated at 25 V nominal. This 0.11 V difference represents approximately 0.44% variation. Both values fall within the ±3% tolerance specification of the original part, making them functionally equivalent for voltage regulation purposes.

Q: Are the SOD-323F and SOD-323 packages physically identical?

A: Both packages belong to the SOD-323 family and are designed for surface mount applications. Physical compatibility is expected; however, specific package dimension verification against PCB footprint design is recommended for critical applications.

Q: What does the ±2% tolerance on the MMXZ5253C-TP mean compared to the ±3% on the DDZ27ASF-7?

A: The ±2% tolerance on the substitute indicates tighter manufacturing control and more precise Zener voltage specification. This represents an improvement over the original part's ±3% tolerance, resulting in more consistent voltage regulation across production batches.

Q: How do the impedance values affect circuit performance?

A: The MMXZ5253C-TP has a maximum impedance of 35 Ohms compared to 70 Ohms for the DDZ27ASF-7. Lower impedance generally results in better voltage regulation and faster transient response. This characteristic of the substitute is favorable for most applications.

Q: What is the significance of the reverse leakage current difference?

A: The MMXZ5253C-TP shows 100 nA reverse leakage at 19 V, compared to 70 nA at 23 V for the DDZ27ASF-7. These measurements are taken at different voltages, making direct comparison difficult. Both values are within acceptable ranges for typical Zener diode applications.

Q: Is the MMXZ5253C-TP suitable for low-temperature applications below -55°C?

A: No. The MMXZ5253C-TP has a minimum operating temperature of -55°C, while the DDZ27ASF-7 operates down to -65°C. Applications requiring operation below -55°C must use the original part or identify alternative components with extended low-temperature ratings.

Q: What compliance certifications should I verify before using the MMXZ5253C-TP?

A: The MMXZ5253C-TP maintains REACH Unaffected status. RoHS compliance status is not specified in the provided technical data. Verify RoHS3 compliance with the manufacturer or distributor if this certification is required for your application.