DDZ36ASF-7 Equivalent & Substitute Parts

Part Overview

The DDZ36ASF-7 is an active Zener diode manufactured by Diodes Incorporated, rated at 32.97 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. Substitute parts are identified when equivalent electrical performance can be achieved within specified tolerance ranges while maintaining mechanical compatibility and compliance certifications.

Substiute Parts

DDZ36ASF-7

Diodes IncorporatedIn Stock: 1135DDZ36ASF-7 Datasheet

Current PartRFQ

BZT52C33S-TP

Micro Commercial CoIn Stock: 3861BZT52C33S-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DDZ36ASF-7 is determined by the following critical parameters:

Zener Voltage Compatibility: The nominal Zener voltage must fall within the operational range of the application. The DDZ36ASF-7 operates at 32.97 V with ±3% tolerance, establishing a voltage window of 31.92 V to 33.98 V.

Power Dissipation Rating: The substitute part must support the maximum power requirement of the circuit. The DDZ36ASF-7 is rated for 500 mW maximum power dissipation.

Package and Mounting: Surface mount compatibility is required. The DDZ36ASF-7 uses SOD-323F packaging, which is mechanically and electrically compatible with SOD-323 variants.

Compliance and Environmental Specifications: Both parts must maintain ROHS3 compliance, unlimited moisture sensitivity rating (MSL 1), and identical operating temperature ranges (-65°C to 150°C).

Forward Voltage Characteristics: Forward voltage drop at specified current (900 mV @ 10 mA) must be equivalent to ensure circuit performance consistency.

Parameter Comparison

Engineering Selection Recommendations

Primary Consideration - Power Dissipation: The BZT52C33S-TP is rated for 200 mW maximum power dissipation, compared to the DDZ36ASF-7 at 500 mW. Selection of the substitute part is contingent upon circuit power requirements not exceeding 200 mW. Applications requiring the full 500 mW rating cannot use this substitute.

Voltage Specification Alignment: The nominal Zener voltages differ by 0.03 V (32.97 V versus 33 V). Both parts fall within acceptable tolerance ranges for most voltage regulation applications. The DDZ36ASF-7 maintains a tighter ±3% tolerance compared to the BZT52C33S-TP at ±6%, which may be significant in precision applications.

Compliance and Certification: Both parts maintain identical ROHS3 compliance, REACH unaffected status, and unlimited moisture sensitivity ratings (MSL 1). Both operate across the full -65°C to 150°C temperature range, ensuring environmental compatibility.

Package Compatibility: The SOD-323F and SOD-323 packages are mechanically and electrically compatible for surface mount applications. PCB footprints and reflow soldering parameters remain consistent between these variants.

Impedance Characteristics: The BZT52C33S-TP exhibits lower maximum impedance (80 Ohms versus 90 Ohms), which may provide improved transient response in certain circuit topologies.

Frequently Asked Questions (FAQ)

Q: Can the BZT52C33S-TP directly replace the DDZ36ASF-7 in all applications?

A: Direct substitution is limited by power dissipation rating. The BZT52C33S-TP is rated for 200 mW maximum, while the DDZ36ASF-7 supports 500 mW. Substitution is valid only when circuit power dissipation remains below 200 mW. Applications requiring higher power handling must retain the original part.

Q: What is the voltage difference between these parts, and does it affect circuit operation?

A: The nominal Zener voltages are 32.97 V (DDZ36ASF-7) and 33 V (BZT52C33S-TP), a difference of 0.03 V. Both parts operate within overlapping tolerance ranges. For most voltage regulation applications, this variance is negligible. Precision applications requiring the tighter ±3% tolerance of the DDZ36ASF-7 should not substitute with the ±6% tolerance part.

Q: Are the SOD-323F and SOD-323 packages interchangeable?

A: Yes. SOD-323F and SOD-323 are mechanically and electrically compatible surface mount packages. PCB footprints, lead spacing, and reflow soldering parameters are identical. Both parts can be used interchangeably from a packaging perspective.

Q: Do both parts meet the same compliance and environmental standards?

A: Yes. Both the DDZ36ASF-7 and BZT52C33S-TP are ROHS3 compliant, REACH unaffected, and rated for unlimited moisture sensitivity (MSL 1). Both operate across -65°C to 150°C, ensuring identical environmental and regulatory compatibility.

Q: What is the significance of the impedance difference between these parts?

A: The BZT52C33S-TP has a maximum impedance of 80 Ohms compared to 90 Ohms for the DDZ36ASF-7. Lower impedance typically provides faster transient response and better high-frequency performance. This difference may be advantageous in applications requiring rapid voltage regulation or noise suppression.

Q: How do the reverse leakage current specifications compare?

A: The DDZ36ASF-7 specifies 70 nA @ 30.5 V, while the BZT52C33S-TP specifies 100 nA @ 23.1 V. These measurements are taken at different reference voltages, making direct comparison difficult. The DDZ36ASF-7 demonstrates lower leakage at its specified condition. Applications sensitive to leakage current should evaluate both specifications within their specific operating voltage range.

Q: Are there any manufacturing or supply chain differences between these parts?

A: The DDZ36ASF-7 is manufactured by Diodes Incorporated, while the BZT52C33S-TP is manufactured by Micro Commercial Co. Both are active products with confirmed inventory availability. Sourcing decisions may depend on supply chain preferences, lead times, and cost considerations specific to procurement requirements.