BZX584C33-V-G-08 Equivalent & Substitute Parts

Part Overview

The BZX584C33-V-G-08 is a 33 V, 200 mW Zener diode manufactured by Vishay General Semiconductor - Diodes Division in SOD-523 surface mount package. This part is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain the 33 V nominal Zener voltage while accommodating variations in power dissipation, impedance, and operating temperature ranges within acceptable engineering tolerances.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	33	V
Tolerance	±5%	—
Power - Max	200	mW
Impedance (Max)	80	Ohms
Current - Reverse Leakage @ Vr	50	nA @ 23.1 V
Operating Temperature	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SC-79, SOD-523	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the BZX584C33-V-G-08 is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Zener (Nom): 33 V (exact match required)
Tolerance: ±5% or tighter (±6% acceptable with design margin verification)
Mounting Type: Surface Mount
Package / Case: SOD-523 or equivalent footprint (0603/SOD-523F acceptable)
RoHS Status: ROHS3 Compliant

Secondary Compatibility Factors:

Power - Max: 200 mW (minimum); lower ratings acceptable if circuit design permits
Impedance (Max): 80 Ohms (reference value; variations acceptable within circuit requirements)
Current - Reverse Leakage: 50–100 nA range acceptable
Operating Temperature: -65°C to 150°C preferred; -55°C to 125°C acceptable for non-extreme applications

Substitute parts are grouped into two categories: direct Vishay alternatives and cross-manufacturer equivalents from Micro Commercial Co, Comchip Technology, and Diodes Incorporated. All listed substitutes maintain the 33 V Zener voltage specification and surface mount configuration.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Zener (Nom) (V)	Tolerance	Power - Max (mW)	Impedance (Max) (Ohms)	Current - Reverse Leakage (nA)	Operating Temperature (°C)	Package / Case	Product Status
BZX584C33-V-G-08	Vishay	33	±5%	200	80	50 @ 23.1 V	-65 to 150	SC-79, SOD-523	Obsolete
BZX584C33-G3-08	Vishay	33	±5%	200	35	50 @ 23.1 V	-65 to 150	SC-79, SOD-523	Active
BZT52C33T-TP	Micro Commercial Co	33	±6%	100	80	100 @ 23.1 V	-65 to 150	SC-79, SOD-523	Active
CZRU52C33	Comchip Technology	33	±5%	150	80	100 @ 25 V	-55 to 125	2-SMD, No Lead (0603/SOD-523F)	Active
CZRUR52C33	Comchip Technology	33	±5%	150	80	100 @ 25 V	-55 to 125	2-SMD, No Lead (0603/SOD-523F)	Active
DDZ9714T-7	Diodes Incorporated	33	±5%	150	—	50 @ 25 V	-65 to 150	SC-79, SOD-523	Active

Engineering Selection Recommendations

Primary Recommendation: BZX584C33-G3-08

The BZX584C33-G3-08 is the direct Vishay equivalent with active product status. It maintains identical electrical specifications (33 V, ±5% tolerance, 200 mW power rating) and identical package configuration (SC-79, SOD-523). The lower impedance (35 Ohms vs. 80 Ohms) represents an improvement in circuit performance. This part is ROHS3 compliant and carries unlimited moisture sensitivity rating (MSL 1). Inventory availability is 6600 units.

Secondary Recommendation: DDZ9714T-7

The DDZ9714T-7 from Diodes Incorporated provides an active alternative with 150 mW power rating, 33 V Zener voltage, and ±5% tolerance. Operating temperature range matches the original part (-65°C to 150°C). Package configuration is identical (SC-79, SOD-523). This part is suitable for applications where 150 mW power dissipation is acceptable. ROHS3 compliant. Inventory availability is 75300 units.

Tertiary Recommendation: BZT52C33T-TP

The BZT52C33T-TP from Micro Commercial Co is an active alternative with 100 mW power rating and ±6% tolerance. Operating temperature range matches the original part (-65°C to 150°C). Package configuration is identical (SC-79, SOD-523). This part is suitable for lower-power applications. ROHS3 compliant.

Package Variant Alternatives: CZRU52C33 and CZRUR52C33

The Comchip Technology parts CZRU52C33 and CZRUR52C33 provide 33 V, ±5% tolerance, 150 mW alternatives in 0603/SOD-523F package configuration. Operating temperature range is -55°C to 125°C. These parts are suitable for applications where the reduced temperature range is acceptable and where 0603 package footprint is compatible with board design. ROHS3 compliant.

All recommended substitutes are ROHS3 compliant, REACH unaffected, and carry EAR99 ECCN classification matching the original part.

Frequently Asked Questions (FAQ)

Q: Can BZX584C33-G3-08 directly replace BZX584C33-V-G-08 in existing designs?

A: Yes. The BZX584C33-G3-08 maintains identical Zener voltage (33 V), tolerance (±5%), power rating (200 mW), and package configuration (SC-79, SOD-523). The impedance improvement (35 Ohms vs. 80 Ohms) is a performance enhancement. No circuit modifications are required.

Q: What is the difference between SOD-523 and 0603/SOD-523F packages?

A: SOD-523 (SC-79) and 0603/SOD-523F are both surface mount packages for Zener diodes with similar electrical performance. The primary difference is physical footprint. SOD-523 is a smaller, more compact package. 0603/SOD-523F is a larger package. Substitution between these packages requires verification of PCB layout compatibility and available board space.

Q: Can I use BZT52C33T-TP (100 mW) instead of the 200 mW original part?

A: Substitution is possible only if circuit design analysis confirms that maximum power dissipation does not exceed 100 mW under all operating conditions. The 100 mW rating represents a 50% reduction in power handling capability. Thermal analysis is required to ensure the part does not exceed junction temperature limits.

Q: Are the Comchip Technology parts (CZRU52C33, CZRUR52C33) suitable for all applications?

A: The Comchip parts are suitable for applications where the operating temperature range of -55°C to 125°C is acceptable. The original part and most alternatives support -65°C to 150°C. If the design requires operation below -55°C or above 125°C, the Comchip alternatives are not suitable. Verify application temperature requirements before selection.

Q: What is the significance of the ±6% tolerance on BZT52C33T-TP versus ±5% on other parts?

A: The ±6% tolerance on BZT52C33T-TP represents a wider acceptable voltage variation band compared to ±5% on other parts. For a 33 V Zener, this means ±1.98 V (±6%) versus ±1.65 V (±5%). Applications with tight voltage regulation requirements should prioritize ±5% tolerance parts. Applications with broader voltage tolerance can accept the ±6% specification.

Q: Is DDZ9714T-7 available in higher quantities than other alternatives?

A: Yes. DDZ9714T-7 inventory is 75300 units, significantly higher than other alternatives (BZX584C33-G3-08: 6600 units; CZRUR52C33: 917 units; CZRU52C33: 618 units; BZT52C33T-TP: 907 units). For high-volume production, DDZ9714T-7 provides supply chain advantage.

Q: Do all substitute parts carry the same compliance certifications as the original?

A: Yes. All listed substitute parts are ROHS3 compliant, REACH unaffected, and carry EAR99 ECCN classification. Moisture sensitivity level (MSL 1 - Unlimited) is identical across all parts. No compliance gaps exist between the original part and any listed substitute.

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