CMXZ39VTO BK Equivalent & Substitute Parts

Part Overview

The CMXZ39VTO BK is a Zener Diode Array manufactured by Central Semiconductor Corp, configured with 3 independent 39 V Zener diodes in a SOT-26 surface mount package. This component is designed for voltage regulation and protection applications requiring multiple independent Zener elements. The part is currently Active in product status with 1112 pieces available in inventory.

Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter tolerances while maintaining functional compatibility in the target application circuit.

Substiute Parts

CMXZ39VTO BK

Central Semiconductor CorpIn Stock: 1167CMXZ39VTO BK Datasheet

Current PartRFQ

MMBZ5259BTS-7-F

Diodes IncorporatedIn Stock: 3131MMBZ5259BTS-7-F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CMXZ39VTO BK is determined by the following critical parameters:

Electrical Equivalence Criteria:

• Configuration: 3 Independent Zener diodes (required)
• Voltage - Zener (Nom): 39 V (required)
• Tolerance: ±5% (required)
• Operating Temperature Range: -65°C to 150°C minimum (required)

Functional Compatibility Criteria:

• Mounting Type: Surface Mount (required)
• Forward Voltage (Vf): 900 mV @ 10 mA maximum (required)
• RoHS3 Compliance (required for regulated applications)

Secondary Parameters (Application-Dependent):

• Power - Max: 350 mW (primary part specification; substitutes with lower ratings require circuit validation)
• Impedance (Max): 130 Ohms (primary part specification; lower impedance acceptable)
• Reverse Leakage Current: 50 nA @ 27.3 V (primary part specification; lower leakage acceptable)

The MMBZ5259BTS-7-F meets all electrical equivalence and functional compatibility criteria. Package differences (SOT-363 vs. SOT-26) require PCB layout verification but do not affect electrical performance.

Parameter Comparison

Engineering Selection Recommendations

Primary Part (CMXZ39VTO BK):

• Use when SOT-26 package footprint is required on existing PCB designs
• Specified for 350 mW maximum power dissipation applications
• Active product status with established supply chain (1112 pieces in stock)
• ROHS3 compliant and REACH unaffected

Substitute Part (MMBZ5259BTS-7-F):

• Use when SOT-363 package footprint is acceptable or preferred for new designs
• Maximum power dissipation rated at 200 mW; suitable for applications within this power envelope
• Lower impedance (80 Ohms vs. 130 Ohms) provides improved voltage regulation characteristics
• Active product status with higher inventory availability (3100 pieces in stock)
• ROHS3 compliant and REACH unaffected
• Supplied in Tape & Reel packaging format

Selection Criteria:

• If circuit power dissipation exceeds 200 mW, the primary part CMXZ39VTO BK is required
• If circuit power dissipation is ≤200 mW, MMBZ5259BTS-7-F is functionally equivalent
• PCB layout must accommodate the selected package type (SOT-26 vs. SOT-363)
• Both parts maintain identical electrical specifications for Zener voltage, tolerance, forward voltage, and operating temperature range

Frequently Asked Questions (FAQ)

Q: Can MMBZ5259BTS-7-F replace CMXZ39VTO BK in all applications?

A: Substitution is valid only when circuit power dissipation does not exceed 200 mW. The MMBZ5259BTS-7-F is rated for 200 mW maximum, while the CMXZ39VTO BK is rated for 350 mW. Applications requiring higher power dissipation must use the primary part.

Q: What is the difference between SOT-26 and SOT-363 packages?

A: SOT-26 and SOT-363 are different surface mount package outlines with different pin configurations and footprints. PCB layout and component placement must be verified for compatibility with the selected package type. Electrical performance is not affected by package selection.

Q: Are the Zener voltage specifications identical?

A: Yes. Both parts specify 39 V nominal Zener voltage with ±5% tolerance. The electrical regulation characteristics are equivalent.

Q: Why does MMBZ5259BTS-7-F have lower impedance?

A: Lower impedance (80 Ohms vs. 130 Ohms) is a characteristic of the MMBZ5259BTS-7-F design. This results in improved voltage regulation performance and is not a limitation for substitution.

Q: Is the higher reverse leakage current in MMBZ5259BTS-7-F a concern?

A: The reverse leakage current difference (100 nA @ 30 V vs. 50 nA @ 27.3 V) is within acceptable engineering tolerances for Zener diode arrays. Both values are low and suitable for voltage regulation applications.

Q: Are both parts RoHS3 compliant?

A: Yes. Both CMXZ39VTO BK and MMBZ5259BTS-7-F are ROHS3 compliant and REACH unaffected.

Q: What is the operating temperature range for both parts?

A: Both parts operate across -65°C to 150°C junction temperature range, providing equivalent thermal performance.

Q: Which part should be selected for new designs?

A: For new designs, either part is acceptable based on power dissipation requirements and available PCB footprint. MMBZ5259BTS-7-F offers higher inventory availability and improved impedance characteristics for applications ≤200 mW.