BZX784C3V9-TP Equivalent & Substitute Parts

Part Overview

The BZX784C3V9-TP is a Zener diode manufactured by Micro Commercial Co, rated at 3.9 V nominal with 150 mW maximum power dissipation in a surface mount SOD-723 package. This component is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage regulation, power handling, and thermal operating ranges while accommodating package form factor considerations.

Substiute Parts

BZX784C3V9-TP

Micro Commercial CoIn Stock: 1035BZX784C3V9-TP Datasheet

Current PartRFQ

BZT52C3V9T-7

Diodes IncorporatedIn Stock: 65126BZT52C3V9T-7 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BZX784C3V9-TP is determined by the following critical electrical parameters:

Electrical Compatibility Criteria:

• Zener voltage (Vz) must equal 3.9 V nominal
• Tolerance must be ±5% or tighter
• Impedance (Zzt) must not exceed 90 Ohms
• Reverse leakage current must not exceed 3 µA @ 1 V
• Forward voltage must not exceed 900 mV @ 10 mA

Mechanical and Environmental Criteria:

• Surface mount technology required
• Operating temperature range must encompass -55°C to 150°C
• RoHS3 compliance required
• Moisture sensitivity level 1 (unlimited) required

Power Handling: Substitute parts may have equal or greater maximum power dissipation. The BZX784C3V9-TP operates at 150 mW maximum; substitutes with higher power ratings remain compatible provided all other parameters are met.

Package Consideration: The original part uses SOD-723 packaging. Substitute parts may use alternative surface mount packages (such as SOD-523) provided the physical dimensions and land pattern compatibility are verified for the specific application circuit board layout.

Parameter Comparison

Engineering Selection Recommendations

BZT52C3V9T-7 as Primary Substitute:

The BZT52C3V9T-7 manufactured by Diodes Incorporated satisfies all critical electrical parameters required for substitution of the BZX784C3V9-TP. Both components maintain identical zener voltage (3.9 V), impedance (90 Ohms), reverse leakage current (3 µA @ 1 V), and forward voltage characteristics (900 mV @ 10 mA).

The substitute part offers the following advantages:

• Active Product Status: BZT52C3V9T-7 is actively manufactured and stocked (65,041 pcs available), eliminating obsolescence risk associated with the BZX784C3V9-TP.
• Enhanced Power Rating: 300 mW maximum power dissipation provides 2× thermal margin compared to the 150 mW original specification, improving reliability in power-limited applications.
• Improved Tolerance: ±5% tolerance is tighter than the original ±5.13%, enhancing voltage regulation precision.
• Extended Temperature Range: Operating range of -65°C to 150°C exceeds the original -55°C to 150°C specification.
• Regulatory Compliance: ROHS3 compliance and MSL 1 rating match the original part.

Package Consideration:

The BZT52C3V9T-7 uses SOD-523 packaging instead of the original SOD-723. Physical dimensions and land pattern compatibility must be verified against the target circuit board layout before implementation. Both packages are surface mount technologies with similar form factors suitable for high-density applications.

Frequently Asked Questions (FAQ)

Q: Can the BZT52C3V9T-7 directly replace the BZX784C3V9-TP without circuit modification?

A: Electrical substitution is valid. The BZT52C3V9T-7 maintains all critical electrical parameters (zener voltage, impedance, leakage current, forward voltage) within specification. However, the package change from SOD-723 to SOD-523 requires verification of physical fit and land pattern compatibility on the target PCB. No circuit topology changes are required.

Q: What is the significance of the higher power rating (300 mW vs. 150 mW) on the substitute part?

A: The increased power dissipation capability of the BZT52C3V9T-7 provides thermal margin and does not negatively impact circuit operation. The substitute part can safely handle the same or lower power levels as the original. This characteristic improves component reliability and extends operational life in thermally constrained environments.

Q: Are there any compliance or certification differences between the two parts?

A: Both parts are ROHS3 compliant and carry MSL 1 (unlimited moisture sensitivity) ratings. The BZT52C3V9T-7 includes REACH Unaffected status. No compliance barriers exist for substitution in regulated applications.

Q: How does the tolerance difference (±5% vs. ±5.13%) affect circuit performance?

A: The BZT52C3V9T-7 tolerance of ±5% is tighter than the original ±5.13%, resulting in improved voltage regulation accuracy. This tighter tolerance enhances circuit performance and reduces voltage variation across the component population.

Q: What is the impact of the extended operating temperature range (-65°C vs. -55°C minimum)?

A: The BZT52C3V9T-7 operates at lower minimum temperatures (-65°C) compared to the original (-55°C). This extended range provides additional operational margin for applications requiring cold-temperature performance. The upper temperature limit (150°C) remains identical.

Q: Is the SOD-523 package smaller or larger than SOD-723?

A: Both SOD-723 and SOD-523 are surface mount packages designed for compact applications. Physical dimensions differ; verification against specific PCB layout requirements is necessary before implementation.

Q: What inventory status should be considered for production planning?

A: The BZX784C3V9-TP is obsolete with 1,014 pcs available. The BZT52C3V9T-7 is actively manufactured with 65,041 pcs in stock, providing long-term supply security and eliminating obsolescence risk for ongoing production.