BZX584C18-V-G-08 Equivalent & Substitute Parts

Part Overview

The BZX584C18-V-G-08 is a Zener diode rated at 18 V nominal voltage with 200 mW maximum power dissipation in a surface mount SOD-523 package. Manufactured by Vishay General Semiconductor - Diodes Division, this component is classified as obsolete. Due to its obsolete product status and limited availability relative to active alternatives, equivalent substitute parts are necessary to maintain design continuity and ensure long-term supply chain reliability for applications requiring 18 V Zener regulation in compact surface mount form factors.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	18	V
Tolerance	±5%	—
Power - Max	200	mW
Impedance (Max)	45	Ohms
Current - Reverse Leakage @ Vr	50 nA @ 12.6 V	—
Operating Temperature Range	-65°C to 150°C	—
Mounting Type	Surface Mount	—
Package / Case	SC-79, SOD-523	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the BZX584C18-V-G-08 is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 18 V nominal
Package type: SOD-523 or equivalent 0603/SOD-523F form factor
Mounting: Surface mount
Tolerance: ±5% or ±6% (acceptable variance)
RoHS3 compliance and MSL Level 1 rating

Secondary Compatibility Factors:

Power dissipation: 200 mW or greater
Operating temperature range: -65°C to 150°C or subset thereof
Impedance and reverse leakage characteristics within acceptable engineering margins

Substitute parts are grouped into two categories: direct SOD-523 package equivalents (BZX584C18-G3-08, BZT52C18T-7, BZT52C18T-TP, DDZ9705T-7) and alternative package form factors (CZRU52C18, CZRUR52C18) that maintain electrical performance within the same 18 V Zener classification.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Impedance (Max)	Reverse Leakage @ Vr	Temp Range	Package	Status
BZX584C18-V-G-08	Vishay	18 V	±5%	200 mW	45 Ω	50 nA @ 12.6 V	-65°C to 150°C	SOD-523	Obsolete
BZX584C18-G3-08	Vishay	18 V	±5%	200 mW	10 Ω	50 nA @ 12.6 V	-65°C to 150°C	SOD-523	Active
BZT52C18T-7	Diodes Incorporated	18 V	±6%	300 mW	45 Ω	100 nA @ 12.6 V	-65°C to 150°C	SOD-523	Active
BZT52C18T-TP	Micro Commercial Co	18 V	±5%	100 mW	45 Ω	100 nA @ 12.6 V	-65°C to 150°C	SOD-523	Active
CZRU52C18	Comchip Technology	18 V	±5%	150 mW	50 Ω	100 nA @ 14 V	-55°C to 125°C	0603/SOD-523F	Active
CZRUR52C18	Comchip Technology	18 V	±5%	150 mW	50 Ω	100 nA @ 14 V	-55°C to 125°C	0603/SOD-523F	Active
DDZ9705T-7	Diodes Incorporated	18 V	±5%	150 mW	—	50 nA @ 13.6 V	-65°C to 150°C	SOD-523	Active

Engineering Selection Recommendations

Direct Replacement (Preferred): BZX584C18-G3-08 is the primary direct substitute. Manufactured by Vishay in the same BZX584C series, it maintains identical electrical specifications (18 V, ±5% tolerance, 200 mW power rating, SOD-523 package) with improved impedance characteristics (10 Ω vs. 45 Ω). Active product status ensures long-term availability. ROHS3 compliance and MSL Level 1 rating match the original specification.

Alternative SOD-523 Options: BZT52C18T-7 (Diodes Incorporated) provides higher power dissipation (300 mW) with identical operating temperature range and package form factor. Tolerance is ±6%, within acceptable engineering margins. Suitable for applications requiring enhanced thermal headroom.

DDZ9705T-7 (Diodes Incorporated) offers 150 mW power rating with ±5% tolerance and full temperature range support (-65°C to 150°C). Reverse leakage characteristics (50 nA @ 13.6 V) closely match the original part.

Lower Power Alternative: BZT52C18T-TP (Micro Commercial Co) is rated at 100 mW and should be selected only when circuit design confirms power dissipation does not exceed this limit. Maintains ±5% tolerance and full temperature range.

Alternative Package Form Factor: CZRU52C18 and CZRUR52C18 (Comchip Technology) provide 18 V Zener regulation in 0603/SOD-523F package with 150 mW power rating. Operating temperature range is reduced to -55°C to 125°C. These parts are suitable for applications where package footprint optimization is prioritized and temperature extremes below -55°C are not required.

All substitute parts carry ROHS3 compliance and MSL Level 1 rating, ensuring regulatory and environmental compatibility with the original specification.

Frequently Asked Questions (FAQ)

Q: Can BZX584C18-G3-08 be used as a direct drop-in replacement for BZX584C18-V-G-08?

A: Yes. Both parts share identical Zener voltage (18 V), tolerance (±5%), power rating (200 mW), operating temperature range (-65°C to 150°C), and SOD-523 package. BZX584C18-G3-08 features lower impedance (10 Ω vs. 45 Ω), which improves voltage regulation performance. Active product status provides superior supply chain continuity.

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

A: SOD-523 and 0603/SOD-523F are equivalent surface mount packages for small signal diodes. Both are miniature form factors suitable for compact PCB layouts. CZRU52C18 and CZRUR52C18 use the 0603/SOD-523F designation. Verify PCB footprint compatibility before selection.

Q: Can BZT52C18T-TP (100 mW) replace the 200 mW BZX584C18-V-G-08?

A: BZT52C18T-TP is suitable only if circuit analysis confirms maximum power dissipation does not exceed 100 mW. Exceeding this rating will cause component failure. If power dissipation is uncertain, select BZX584C18-G3-08, BZT52C18T-7, or DDZ9705T-7 to ensure adequate thermal margin.

Q: Are the Comchip CZRU52C18 and CZRUR52C18 parts interchangeable?

A: Yes. Both parts are electrically identical with 18 V Zener voltage, ±5% tolerance, 150 mW power rating, and 0603/SOD-523F package. CZRUR52C18 is listed as a variant of CZRU52C18. Verify inventory and lead time availability before selection.

Q: What is the impact of ±6% tolerance (BZT52C18T-7) versus ±5% tolerance?

A: The ±6% tolerance on BZT52C18T-7 results in a Zener voltage range of 16.92 V to 19.08 V, compared to 17.1 V to 18.9 V for ±5% parts. This wider tolerance is acceptable in most voltage regulation applications but should be verified against circuit design requirements for precision voltage reference applications.

Q: Why is the operating temperature range reduced for CZRU52C18 and CZRUR52C18?

A: Comchip Technology specifies -55°C to 125°C for these parts, compared to -65°C to 150°C for Vishay and Diodes Incorporated alternatives. Select these parts only if the application does not require operation below -55°C or above 125°C. For full temperature range support, use BZX584C18-G3-08, BZT52C18T-7, BZT52C18T-TP, or DDZ9705T-7.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 Compliant status and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original BZX584C18-V-G-08 specification.

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