CZRF52C33-HF Zener Diode Equivalent & Substitute Parts

Part Overview

The CZRF52C33-HF is a 33 V, 200 mW surface mount zener diode manufactured by Comchip Technology in the 1005/SOD-323F package. This component is classified as Active and maintains full RoHS3 compliance. Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference voltage circuits in consumer and industrial electronics. Substitute parts may be required due to inventory constraints, supply chain disruptions, or design optimization for specific application requirements.

Substiute Parts

CZRF52C33-HF

Comchip TechnologyIn Stock: 1017CZRF52C33-HF Datasheet

Current PartRFQ

BZT52C33S-TP

Micro Commercial CoIn Stock: 3861BZT52C33S-TP Datasheet

MFR RecommendedRFQ

BZX84J-C33,115

Nexperia USA Inc.In Stock: 6363BZX84J-C33,115 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CZRF52C33-HF is determined by the following critical parameters:

Primary Substitution Criteria:

• Zener voltage (Vz): Must be 33 V nominal
• Package compatibility: SOD-323 or SOD-323F surface mount packages
• RoHS3 compliance: Required for regulatory alignment
• Active product status: Ensures ongoing manufacturer support

Secondary Compatibility Factors:

• Power dissipation rating: 200 mW minimum (higher ratings acceptable for derating applications)
• Tolerance: ±5% to ±6% acceptable for voltage regulation circuits
• Impedance: 40 to 80 Ohms maximum
• Reverse leakage current: 50 to 100 nA at specified voltage
• Operating temperature range: -55°C to 125°C minimum (extended ranges acceptable)

Two substitute parts meet these criteria with documented electrical and mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

BZT52C33S-TP (Micro Commercial Co): This substitute maintains electrical parity with the CZRF52C33-HF across all critical parameters: identical 33 V zener voltage, 200 mW power rating, 80 Ohm impedance, and 900 mV forward voltage. The ±6% tolerance is within acceptable variance for standard voltage regulation applications. Extended operating temperature range (-65 to 150°C) provides thermal margin beyond the main part. Package compatibility is confirmed in SOD-323 format. RoHS3 compliance and Active product status ensure supply continuity. This substitute is suitable for direct replacement in non-automotive applications.

BZX84J-C33,115 (Nexperia USA Inc.): This substitute provides enhanced performance characteristics with 550 mW power dissipation (2.75× the main part rating), lower impedance (40 Ohms), and reduced reverse leakage (50 nA). Zener voltage remains 33 V with ±5% tolerance matching the main part. AEC-Q101 automotive qualification and extended temperature range (-65 to 150°C) enable use in automotive and high-reliability applications. SOD-323F package maintains form factor compatibility. RoHS3 compliance and Active status confirmed. This substitute is suitable for applications requiring enhanced power handling or automotive-grade reliability.

Frequently Asked Questions (FAQ)

Q: Can BZT52C33S-TP replace CZRF52C33-HF in all applications?

A: BZT52C33S-TP is electrically and mechanically compatible for standard voltage regulation and overvoltage protection circuits. The ±6% tolerance versus ±5% introduces 1% additional variance. Both parts share identical 33 V zener voltage, 200 mW power rating, and 80 Ohm impedance. Substitution is valid for applications where these specifications are within design margins.

Q: What is the difference between BZX84J-C33,115 and the main part?

A: BZX84J-C33,115 differs in three areas: (1) Power rating is 550 mW versus 200 mW, enabling higher current applications; (2) Impedance is 40 Ohms versus 80 Ohms, providing better voltage regulation stability; (3) AEC-Q101 automotive qualification is included. Zener voltage (33 V) and tolerance (±5%) are identical. This substitute is suitable for applications requiring enhanced performance or automotive compliance.

Q: Are package differences between SOD-323 and SOD-323F significant?

A: Both SOD-323 and SOD-323F are surface mount packages with identical lead spacing and footprint compatibility. SOD-323F includes a flat marking on the cathode end for automated assembly verification. PCB layouts designed for either package accommodate both variants without modification.

Q: Can I use BZX84J-C33,115 in place of CZRF52C33-HF if my circuit only requires 200 mW?

A: Yes. BZX84J-C33,115 with 550 mW rating operates safely at 200 mW dissipation. The higher power rating provides derating margin and improved thermal stability. Lower impedance (40 Ohms) may improve voltage regulation performance. No circuit modification is required.

Q: What is the impact of ±6% tolerance in BZT52C33S-TP versus ±5% in CZRF52C33-HF?

A: For a 33 V nominal zener, ±5% tolerance yields 31.35 to 34.65 V range; ±6% tolerance yields 31.02 to 34.98 V range. The additional 0.33 V variance at each extreme is negligible in standard voltage regulation applications. Design margins must accommodate this range if critical voltage thresholds exist within ±0.33 V of 33 V.

Q: Are all three parts RoHS3 compliant?

A: Yes. CZRF52C33-HF, BZT52C33S-TP, and BZX84J-C33,115 are all RoHS3 compliant with Moisture Sensitivity Level 1 (Unlimited). No special handling or storage requirements apply beyond standard component practices.

Q: Which substitute should I select for automotive applications?

A: BZX84J-C33,115 is the appropriate choice for automotive applications due to AEC-Q101 qualification. This certification confirms compliance with automotive reliability and environmental testing standards. BZT52C33S-TP lacks automotive qualification and is suitable for consumer and industrial applications only.