CMSZ5239B TR Equivalent & Substitute Parts

Part Overview

The CMSZ5239B TR is a Zener diode rated at 9.1 V nominal voltage with 275 mW maximum power dissipation in a surface mount SOT-323 package. This component is manufactured by Central Semiconductor Corp and is currently in active production status with 703 pieces available in inventory.

Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference voltage circuits. Finding equivalent or substitute parts becomes necessary due to supply chain constraints, lead time requirements, design optimization, or component availability fluctuations.

Substiute Parts

CMSZ5239B TR

Central Semiconductor CorpIn Stock: 746CMSZ5239B TR Datasheet

Current PartRFQ

BZX84C9V1W-7-F

Diodes IncorporatedIn Stock: 36492BZX84C9V1W-7-F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CMSZ5239B TR is determined by the following critical parameters:

Primary Substitution Criteria:

• Zener voltage (Vz) must be 9.1 V nominal
• Package must be SOT-323 (SC-70) for mechanical and thermal compatibility
• Mounting type must be surface mount
• Maximum power rating must meet or exceed circuit requirements

Secondary Compatibility Factors:

• Voltage tolerance (±5% or tighter acceptable)
• Impedance characteristics (Zzt)
• Reverse leakage current specifications
• Forward voltage characteristics
• Operating temperature range

The BZX84C9V1W-7-F from Diodes Incorporated qualifies as a substitute based on matching the primary criteria: identical 9.1 V zener voltage, SOT-323 package, and surface mount configuration.

Parameter Comparison

Engineering Selection Recommendations

CMSZ5239B TR (Primary Component)

The CMSZ5239B TR remains the specified component with the following characteristics:

• Higher maximum power dissipation (275 mW vs. 200 mW)
• Lower impedance (10 Ohms vs. 15 Ohms)
• Extended upper operating temperature limit (150°C vs. 125°C)
• RoHS non-compliant status
• 703 pieces currently in stock

BZX84C9V1W-7-F (Substitute Component)

The BZX84C9V1W-7-F from Diodes Incorporated is electrically and mechanically compatible as a substitute with the following considerations:

• Reduced maximum power rating (200 mW) requires circuit verification for applications near thermal limits
• Slightly higher impedance (15 Ohms) may affect voltage regulation precision in high-impedance circuits
• Lower maximum reverse leakage current (500 nA vs. 3 µA) provides superior leakage performance
• RoHS3 compliant status supports environmental and regulatory requirements
• 36,400 pieces in inventory provide superior availability
• Operating temperature range limited to 125°C maximum

Both components share identical zener voltage (9.1 V), forward voltage characteristics (900 mV @ 10 mA), and SOT-323 package configuration, ensuring direct mechanical and thermal compatibility in surface mount applications.

Frequently Asked Questions (FAQ)

Q: Can BZX84C9V1W-7-F replace CMSZ5239B TR in all applications?

A: Substitution is valid when circuit power dissipation does not exceed 200 mW and operating temperature remains below 125°C. Applications requiring the full 275 mW power rating or temperatures above 125°C require the original CMSZ5239B TR specification.

Q: What is the impact of the impedance difference (10 Ohms vs. 15 Ohms)?

A: The 5 Ohm impedance increase in the BZX84C9V1W-7-F affects voltage regulation stability, particularly in circuits with high source impedance or variable load conditions. Low-impedance applications are less sensitive to this parameter variation.

Q: Are the packages physically identical?

A: Both components use the SOT-323 (SC-70) package with identical pin configuration, footprint, and thermal characteristics. Direct PCB layout substitution is mechanically feasible without redesign.

Q: How do the voltage tolerances compare?

A: CMSZ5239B TR specifies ±5% tolerance while BZX84C9V1W-7-F specifies ±6% tolerance. Both fall within typical zener diode tolerance ranges. Applications requiring tighter voltage regulation should verify tolerance stack-up analysis.

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

A: BZX84C9V1W-7-F exhibits lower reverse leakage (500 nA @ 6 V vs. 3 µA @ 7 V), resulting in reduced standby current consumption and improved circuit efficiency in battery-powered or low-power applications.

Q: Does RoHS compliance affect substitution decisions?

A: RoHS3 compliance of BZX84C9V1W-7-F supports regulatory requirements in markets with environmental restrictions. CMSZ5239B TR non-compliance may limit use in regulated applications or regions with RoHS mandates.

Q: What inventory considerations apply to these parts?

A: CMSZ5239B TR has 703 pieces available while BZX84C9V1W-7-F has 36,400 pieces in stock. Substitute selection may be driven by lead time requirements and supply chain continuity needs.