CMLZDA3V3 BK Equivalent & Substitute Parts

Part Overview

The CMLZDA3V3 BK is a Zener Diode Array manufactured by Central Semiconductor Corp, configured as a 1 Pair Common Anode design with a nominal Zener voltage of 3.3 V and maximum power dissipation of 250 mW in SOT-563 packaging. This component is classified as obsolete, necessitating identification of active equivalent parts to ensure design continuity and supply chain reliability for new production and maintenance applications.

Substiute Parts

CMLZDA3V3 BK

Central Semiconductor CorpIn Stock: 897CMLZDA3V3 BK Datasheet

Current PartRFQ

BZB784-C3V3,115

NXP SemiconductorsIn Stock: 235185BZB784-C3V3,115 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CMLZDA3V3 BK is determined by strict equivalence across the following critical parameters:

Functional Equivalence Criteria:

• Configuration: 1 Pair Common Anode (pin-compatible topology)
• Voltage - Zener (Nom): 3.3 V (identical voltage rating)
• Impedance (Max): 95 Ohms (matching dynamic impedance)
• Current - Reverse Leakage @ Vr: 5 µA @ 1 V (identical leakage specification)
• Mounting Type: Surface Mount (same assembly process)
• Moisture Sensitivity Level: 1 (Unlimited) (equivalent environmental rating)

Acceptable Parameter Variations:

• Power - Max: Substitute may have lower power rating (180 mW acceptable for 250 mW original, as long as application requirements are met)
• Tolerance: Substitute may have tighter tolerance (±5% acceptable for ±6.06% original)
• Package / Case: SOT-323 (SC-70) acceptable as functional equivalent to SOT-563 with different footprint

The BZB784-C3V3,115 from NXP Semiconductors meets all functional equivalence criteria and is classified as an active product with current manufacturing status.

Parameter Comparison

Engineering Selection Recommendations

The BZB784-C3V3,115 is the manufacturer-recommended substitute for the obsolete CMLZDA3V3 BK. Selection of this substitute is based on the following engineering factors:

Product Status Compliance: The CMLZDA3V3 BK is classified as obsolete with no active manufacturing. The BZB784-C3V3,115 is an active product from NXP Semiconductors with current production status and established supply chain availability (235,094 pieces in stock).

Functional Equivalence: Both parts maintain identical Zener voltage (3.3 V), impedance (95 Ohms), reverse leakage current (5 µA @ 1 V), and common anode configuration. These parameters ensure functional interchangeability in circuit operation.

Environmental Compliance: Both parts carry MSL 1 (Unlimited) moisture sensitivity rating and are REACH compliant (BZB784-C3V3,115 is REACH Unaffected), meeting regulatory requirements for industrial and commercial applications.

Power Dissipation Consideration: The substitute part has a maximum power rating of 180 mW compared to the original 250 mW. Circuit design must verify that actual power dissipation does not exceed 180 mW under worst-case operating conditions.

Package Footprint Change: The substitute uses SOT-323 (SC-70) packaging instead of SOT-563. PCB layout redesign is required to accommodate the different footprint dimensions and pin spacing.

Frequently Asked Questions (FAQ)

Q: Can the BZB784-C3V3,115 be used as a direct pin-for-pin replacement for the CMLZDA3V3 BK?

A: The BZB784-C3V3,115 is functionally equivalent but not a direct pin-for-pin replacement due to different package types (SOT-323 vs. SOT-563). Both use common anode configuration with identical pin functionality, but physical footprint and pin spacing differ. PCB redesign is required.

Q: What is the significance of the power rating difference (250 mW vs. 180 mW)?

A: The substitute part has a lower maximum power dissipation rating. The circuit design must ensure that actual power dissipation under all operating conditions, including worst-case scenarios, does not exceed 180 mW. If the original design requires power dissipation above 180 mW, the substitute is not suitable.

Q: Are the Zener voltage tolerances compatible?

A: Yes. The substitute has a tighter tolerance (±5%) compared to the original (±6.06%). This means the substitute will maintain the 3.3 V Zener voltage within a narrower range, which is acceptable for applications designed for the original tolerance.

Q: What is the difference between SOT-563 and SOT-323 packaging?

A: SOT-563 and SOT-323 are different surface mount package types with different physical dimensions and pin configurations. SOT-323 (SC-70) is smaller and more compact. Component placement, solder pad layout, and PCB routing must be redesigned for the different package.

Q: Is the BZB784-C3V3,115 available in the same packaging as the original part?

A: No. The BZB784-C3V3,115 is supplied in SOT-323 (SC-70) packaging, while the CMLZDA3V3 BK was available in SOT-563 and SOT-666. If SOT-563 packaging is mandatory for your application, alternative substitutes must be evaluated.

Q: What does "REACH Unaffected" mean for the BZB784-C3V3,115?

A: REACH Unaffected indicates that the component is not subject to REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) restrictions. This confirms compliance with European chemical safety regulations.

Q: Can I use the BZB784-C3V3,115 in applications with operating temperatures below -65°C or above 150°C?

A: The operating temperature range for the BZB784-C3V3,115 was not provided in the specification data. Verify the complete operating temperature range with the NXP datasheet before use in extreme temperature applications.