BZX584C12-V-G-08 Equivalent & Substitute Parts

Part Overview

The BZX584C12-V-G-08 is a 12 V Zener diode rated at 200 mW in SOD-523 surface mount packaging, manufactured by Vishay General Semiconductor - Diodes Division. This component is classified as obsolete, indicating discontinuation from the manufacturer. Identification of equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this Zener diode specification.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	12 V
Tolerance	±5%
Power - Max	200 mW
Impedance (Max)	25 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 8 V
Operating Temperature	-65°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	SC-79, SOD-523
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the BZX584C12-V-G-08 is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 12 V nominal
Tolerance: ±5%
Package type: SOD-523 surface mount
Mounting type: Surface mount
RoHS3 compliance
MSL rating: 1 (Unlimited)

Secondary Compatibility Factors:

Power dissipation rating (200 mW or higher)
Impedance characteristics (25 Ohms or lower)
Reverse leakage current (100 nA or lower at specified voltage)
Operating temperature range (-65°C to 150°C or equivalent coverage)

Substitute parts are grouped into two categories: direct equivalents maintaining identical electrical specifications and compatible alternatives with enhanced or modified ratings that satisfy the primary substitution criteria while remaining functionally compatible within the application envelope.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Impedance (Max)	Reverse Leakage @ Vr	Operating Temp	Package	Product Status
BZX584C12-V-G-08	Vishay	12 V	±5%	200 mW	25 Ohms	100 nA @ 8 V	-65°C ~ 150°C	SOD-523	Obsolete
BZX584C12-G3-08	Vishay	12 V	±5%	200 mW	10 Ohms	100 nA @ 8 V	-65°C ~ 150°C	SOD-523	Active
BZT52C12T-7	Diodes Incorporated	12 V	±5%	300 mW	25 Ohms	100 nA @ 8 V	-65°C ~ 150°C	SOD-523	Active
BZT52C12T-TP	Micro Commercial Co	12 V	±5%	100 mW	25 Ohms	100 nA @ 8 V	-65°C ~ 150°C	SOD-523	Active
CZRU52C12	Comchip Technology	12 V	±5%	150 mW	20 Ohms	100 nA @ 9 V	-55°C ~ 125°C	0603/SOD-523F	Active
CZRUR52C12	Comchip Technology	12 V	±5%	150 mW	20 Ohms	100 nA @ 9 V	-55°C ~ 125°C	0603/SOD-523F	Active
DDZ9699T-7	Diodes Incorporated	12 V	±5%	150 mW	Not specified	50 nA @ 9.1 V	-65°C ~ 150°C	SOD-523	Active
SZMM5Z12VT1G	onsemi	12 V	±5%	500 mW	25 Ohms	100 nA @ 8 V	-65°C ~ 150°C	SOD-523	Active

Engineering Selection Recommendations

Direct Equivalent (Preferred Primary Substitute):

BZX584C12-G3-08 from Vishay General Semiconductor - Diodes Division is the direct equivalent replacement. This part maintains identical electrical specifications to the obsolete BZX584C12-V-G-08, including 12 V nominal Zener voltage, ±5% tolerance, 200 mW power rating, and SOD-523 packaging. The BZX584C12-G3-08 carries active product status with ROHS3 compliance and unlimited moisture sensitivity rating. The impedance specification is improved at 10 Ohms maximum compared to the original 25 Ohms, providing superior performance characteristics. This part is available in high inventory quantities (25,505 units) and is suitable for direct substitution without circuit redesign.

Alternative Substitutes (Higher Power Rating):

BZT52C12T-7 from Diodes Incorporated and SZMM5Z12VT1G from onsemi provide enhanced power dissipation ratings of 300 mW and 500 mW respectively, while maintaining the 12 V nominal voltage, ±5% tolerance, and SOD-523 packaging. Both parts carry active product status and ROHS3 compliance. These alternatives are suitable for applications where increased thermal headroom or higher power handling capability is beneficial. SZMM5Z12VT1G includes automotive qualification (AEC-Q101) and is available in high inventory (212,200 units).

Alternative Substitutes (Lower Power Rating):

BZT52C12T-TP from Micro Commercial Co provides a 100 mW power rating, which is lower than the original specification. This part maintains 12 V nominal voltage, ±5% tolerance, and SOD-523 packaging with active product status and ROHS3 compliance. Selection of this part is appropriate only for applications where the 200 mW power requirement can be reduced without performance degradation.

Package Variant Alternatives:

CZRU52C12 and CZRUR52C12 from Comchip Technology provide 12 V Zener diodes in 0603/SOD-523F packaging with 150 mW power rating. These parts carry active product status and ROHS3 compliance but operate within a reduced temperature range (-55°C to 125°C) compared to the original specification (-65°C to 150°C). Selection of these parts requires verification that the narrower operating temperature range is acceptable for the application.

Lower Power Alternative:

DDZ9699T-7 from Diodes Incorporated provides a 150 mW power rating with 12 V nominal voltage and SOD-523 packaging. This part carries active product status, ROHS3 compliance, and maintains the full operating temperature range (-65°C to 150°C). Reverse leakage current is specified at 50 nA at 9.1 V, which is superior to the original specification.

Frequently Asked Questions (FAQ)

Q: Can BZX584C12-G3-08 be used as a direct replacement for BZX584C12-V-G-08?

A: Yes. BZX584C12-G3-08 is the direct equivalent from the same manufacturer (Vishay). Both parts share identical Zener voltage (12 V), tolerance (±5%), power rating (200 mW), and SOD-523 packaging. The primary difference is that BZX584C12-G3-08 is active product status with improved impedance specification (10 Ohms vs. 25 Ohms) and higher inventory availability.

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

A: SOD-523 and 0603/SOD-523F are related but distinct package designations. SOD-523 is the standard surface mount package for the primary substitutes. The 0603/SOD-523F designation used by Comchip Technology parts (CZRU52C12, CZRUR52C12) indicates a 0603 footprint with SOD-523F variant packaging. Verification of PCB footprint compatibility is required before selecting these alternatives.

Q: Can I use SZMM5Z12VT1G (500 mW) instead of the 200 mW original part?

A: Yes. SZMM5Z12VT1G maintains the 12 V nominal voltage, ±5% tolerance, and SOD-523 packaging. The higher power rating (500 mW) provides increased thermal capability and is functionally compatible. This part includes automotive qualification (AEC-Q101) and is suitable for applications requiring enhanced reliability or thermal margin.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance status, matching the original BZX584C12-V-G-08 specification.

Q: What is the operating temperature limitation for Comchip Technology parts?

A: CZRU52C12 and CZRUR52C12 operate within -55°C to 125°C, which is narrower than the original specification of -65°C to 150°C. These parts are suitable only for applications where the reduced temperature range is acceptable. All other substitute parts maintain the full -65°C to 150°C operating range.

Q: Is BZT52C12T-TP (100 mW) suitable for my application?

A: BZT52C12T-TP is suitable only if your application can operate with reduced power dissipation capability (100 mW vs. 200 mW original). Circuit analysis is required to confirm that the lower power rating does not compromise performance or thermal stability in your specific application.

Q: What is the difference between CZRU52C12 and CZRUR52C12?

A: Both parts are identical in electrical specifications (12 V, ±5%, 150 mW, 0603/SOD-523F packaging). CZRUR52C12 is listed as a substitute for CZRU52C12 with lower inventory availability (923 units vs. 11,747 units). Selection between these parts is based on packaging preference and availability requirements.

Q: Can DDZ9699T-7 be used in place of the original part?

A: Yes. DDZ9699T-7 maintains 12 V nominal voltage, ±5% tolerance, and SOD-523 packaging with full operating temperature range (-65°C to 150°C). The 150 mW power rating is lower than the original 200 mW specification. This part is suitable if your application power requirements do not exceed 150 mW. Reverse leakage current is superior at 50 nA at 9.1 V.

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