CZRQR39VB-HF Zener Diode 39V 125mW Equivalent & Substitute Parts

Part Overview

The CZRQR39VB-HF is a 39V Zener diode manufactured by Comchip Technology, rated for 125mW power dissipation in a 0402 surface mount package. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design requirements and procurement continuity. Substitute parts must maintain the 39V nominal Zener voltage while accommodating variations in tolerance, power rating, and package specifications within acceptable electrical parameters.

Substiute Parts

CZRQR39VB-HF

Comchip TechnologyIn Stock: 1078CZRQR39VB-HF Datasheet

Current PartRFQ

CZRQC39VB-HF

Comchip TechnologyIn Stock: 774CZRQC39VB-HF Datasheet

MFR RecommendedRFQ

BZX884-B39,315

Nexperia USA Inc.In Stock: 29736BZX884-B39,315 Datasheet

MFR RecommendedRFQ

BZX884-C39,315

Nexperia USA Inc.In Stock: 41169BZX884-C39,315 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CZRQR39VB-HF is determined by the following critical parameters:

Primary Matching Criteria:

• Voltage - Zener (Nom): 39V (exact match required)
• Impedance (Max): 130 Ohms (exact match across all candidates)
• Voltage - Forward (Max) @ If: 900mV @ 10mA (exact match across all candidates)
• Current - Reverse Leakage @ Vr: 100nA @ 30V (main part specification)

Allowable Variations:

• Tolerance: ±2% to ±5% (wider tolerance acceptable for substitution)
• Power - Max: 125mW to 250mW (higher power rating acceptable)
• Operating Temperature Range: -55°C to 125°C (main part) to -65°C to 150°C (extended range acceptable)
• Package / Case: 0402 (1006 Metric) to SOD-882 (alternative package acceptable)
• Reverse Leakage: 100nA @ 30V to 50nA @ 27.3V (lower leakage acceptable)

Compliance Requirements:

• RoHS3 Compliant (maintained across all substitutes)
• Product Status: Active preferred over Obsolete

The three identified substitutes maintain the core 39V Zener voltage specification and critical electrical parameters while offering improved product status, extended temperature ranges, or higher power ratings suitable for thermal margin applications.

Parameter Comparison

Engineering Selection Recommendations

CZRQC39VB-HF (Comchip Technology)

This substitute maintains identical electrical specifications and package form factor to the main part while offering active product status. The tolerance specification of ±2.49% remains within acceptable substitution parameters. This option provides direct form-fit-function replacement with no PCB layout modifications required. Recommended for applications requiring minimal design changes and continued Comchip Technology supply chain integration.

BZX884-B39,315 (Nexperia USA Inc.)

This substitute provides doubled power dissipation capacity (250mW vs. 125mW) with extended operating temperature range (-65°C to 150°C). The ±2% tolerance matches the main part specification. AEC-Q100 automotive qualification and active product status support long-term availability. Package change from 0402 to SOD-882 requires PCB layout modification. Recommended for applications requiring enhanced thermal margin or automotive-grade reliability.

BZX884-C39,315 (Nexperia USA Inc.)

This substitute offers identical power and temperature specifications to BZX884-B39,315 with relaxed tolerance of ±5%. The wider tolerance may be acceptable in applications with less stringent voltage regulation requirements. AEC-Q100 qualification and active status ensure supply continuity. Package change from 0402 to SOD-882 requires PCB layout modification. Recommended for cost-optimized designs where ±5% tolerance is acceptable.

Frequently Asked Questions (FAQ)

Q: Can CZRQC39VB-HF be used as a direct replacement for CZRQR39VB-HF?

A: Yes. CZRQC39VB-HF maintains identical electrical parameters (39V nominal, 125mW power, ±2.49% tolerance, 130Ω impedance) and package specification (0402/SOD-923F). The primary difference is product status change from obsolete to active. No design modifications are required.

Q: What is the key difference between BZX884-B39,315 and BZX884-C39,315?

A: The primary difference is tolerance specification: BZX884-B39,315 is ±2% while BZX884-C39,315 is ±5%. Both share identical 39V nominal voltage, 250mW power rating, 130Ω impedance, and AEC-Q100 automotive qualification. Selection depends on voltage regulation tolerance requirements.

Q: Why do the Nexperia parts have higher power ratings (250mW vs. 125mW)?

A: The Nexperia BZX884 series uses SOD-882 package geometry, which provides greater thermal dissipation capability compared to the 0402 package. Higher power rating reflects the package's thermal characteristics, not a functional requirement change.

Q: Do package changes from 0402 to SOD-882 require PCB redesign?

A: Yes. SOD-882 and 0402 packages have different footprints and land patterns. PCB layout modification is required when substituting Nexperia parts. CZRQC39VB-HF maintains 0402 package compatibility and requires no layout changes.

Q: Are all substitutes RoHS3 compliant?

A: Yes. CZRQC39VB-HF, BZX884-B39,315, and BZX884-C39,315 are all ROHS3 compliant, matching the main part specification.

Q: Which substitute is recommended for automotive applications?

A: BZX884-B39,315 and BZX884-C39,315 both carry AEC-Q100 automotive qualification. CZRQC39VB-HF does not specify automotive qualification. For automotive designs, Nexperia parts are the appropriate selection.

Q: What is the impact of tolerance differences on circuit performance?

A: Tolerance affects Zener voltage accuracy. CZRQR39VB-HF and BZX884-B39,315 specify ±2% tolerance (±0.78V at 39V nominal). CZRQC39VB-HF specifies ±2.49% (±0.97V). BZX884-C39,315 specifies ±5% (±1.95V). Applications requiring tight voltage regulation should prioritize ±2% tolerance parts.