BZX584C27-V-G-08 Equivalent & Substitute Parts

Part Overview

The BZX584C27-V-G-08 is a 27 V Zener diode rated for 200 mW 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 status, equivalent and substitute parts from active manufacturers are necessary to maintain design continuity and ensure long-term component availability for new production and field replacements.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	27 V
Tolerance	±5%
Power - Max	200 mW
Impedance (Max)	80 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 18.9 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 BZX584C27-V-G-08 is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 27 V nominal
Tolerance: ±5% or tighter
Package type: SOD-523 or equivalent surface mount package
Mounting type: Surface mount
RoHS3 compliance
Operating temperature range compatibility

Secondary Compatibility Factors:

Power dissipation rating (200 mW or higher)
Impedance characteristics (80 Ohms maximum or lower)
Reverse leakage current specifications
Moisture sensitivity level

Substitute parts are grouped into two categories based on package compatibility:

Category 1: SOD-523 Package Direct Substitutes Parts maintaining the SC-79/SOD-523 package footprint with matching or superior electrical specifications.

Category 2: Alternative Package Substitutes Parts with equivalent electrical performance but different surface mount packages (0603/SOD-523F), requiring PCB layout verification.

Parameter Comparison

Parameter	BZX584C27-V-G-08	BZX584C27-G3-08	BZT52C27T-TP	CZRU52C27	CZRUR52C27	DDZ9711T-7
Manufacturer	Vishay	Vishay	Micro Commercial Co	Comchip Technology	Comchip Technology	Diodes Incorporated
Voltage - Zener (Nom)	27 V	27 V	27 V	27 V	27 V	27 V
Tolerance	±5%	±5%	±7%	±5%	±5%	±5%
Power - Max	200 mW	200 mW	100 mW	150 mW	150 mW	150 mW
Impedance (Max)	80 Ohms	25 Ohms	80 Ohms	80 Ohms	80 Ohms	Not specified
Current - Reverse Leakage @ Vr	50 nA @ 18.9 V	50 nA @ 18.9 V	100 nA @ 18.9 V	100 nA @ 20 V	100 nA @ 20 V	50 nA @ 20.4 V
Operating Temperature	-65°C ~ 150°C	150°C (TJ)	-65°C ~ 150°C	-55°C ~ 125°C	-55°C ~ 125°C	-65°C ~ 150°C (TJ)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SC-79, SOD-523	SC-79, SOD-523	SC-79, SOD-523	2-SMD, No Lead (0603)	2-SMD, No Lead (0603)	SC-79, SOD-523
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitute: BZX584C27-G3-08

The BZX584C27-G3-08 is the direct equivalent from Vishay General Semiconductor - Diodes Division. This part maintains identical electrical specifications to the obsolete BZX584C27-V-G-08, including 27 V nominal zener voltage, ±5% tolerance, 200 mW power rating, and SOD-523 package. The part is currently active in production with 975 units in stock. The impedance specification of 25 Ohms is superior to the original 80 Ohms maximum, providing improved voltage regulation characteristics. This substitute requires no design modifications and is the preferred replacement for direct PCB compatibility.

Secondary Substitute: DDZ9711T-7

The DDZ9711T-7 from Diodes Incorporated is an active production alternative with 27 V nominal zener voltage, ±5% tolerance, and SOD-523 package compatibility. Power dissipation is rated at 150 mW, which is lower than the original 200 mW specification. This part is suitable for applications where the full 200 mW power budget is not required. The operating temperature range of -65°C to 150°C matches the original specification. Extensive inventory availability (635,400 units) ensures long-term supply continuity. No PCB layout modifications are necessary.

Tertiary Substitute: BZT52C27T-TP

The BZT52C27T-TP from Micro Commercial Co provides 27 V zener voltage with SOD-523 package compatibility. The tolerance specification is ±7%, which is wider than the original ±5%. Power dissipation is rated at 100 mW, representing a significant reduction from the original 200 mW specification. This part is suitable only for applications with reduced power dissipation requirements. The operating temperature range of -65°C to 150°C is maintained. Selection of this part requires circuit analysis to confirm power budget compatibility.

Alternative Package Substitutes: CZRU52C27 and CZRUR52C27

Both Comchip Technology parts (CZRU52C27 and CZRUR52C27) provide 27 V zener voltage with ±5% tolerance and 150 mW power rating. These parts use a 0603/SOD-523F package format, which differs from the original SC-79/SOD-523 package. PCB layout modifications are required for footprint compatibility. The operating temperature range is -55°C to 125°C, which is narrower than the original -65°C to 150°C specification. These substitutes are suitable for applications operating within the reduced temperature range. Both parts are currently active with adequate inventory (873 and 1,092 units respectively).

Frequently Asked Questions (FAQ)

Q: Can BZX584C27-G3-08 be used as a direct replacement for BZX584C27-V-G-08?

A: Yes. The BZX584C27-G3-08 is a direct equivalent with identical zener voltage (27 V), tolerance (±5%), power rating (200 mW), and SOD-523 package. No design modifications are required. The impedance specification is improved (25 Ohms vs. 80 Ohms maximum), providing superior performance characteristics.

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

A: SOD-523 (SC-79) and 0603 are different surface mount package formats with distinct footprints. SOD-523 is a smaller, two-terminal package optimized for diodes. The 0603 package is a rectangular chip component format. Parts using different packages require PCB layout modifications and cannot be used interchangeably without redesign.

Q: Is the BZT52C27T-TP suitable for all applications using the BZX584C27-V-G-08?

A: The BZT52C27T-TP has a lower power dissipation rating (100 mW vs. 200 mW) and wider tolerance (±7% vs. ±5%). Circuit analysis is required to confirm that the application power budget does not exceed 100 mW and that the wider tolerance is acceptable for the intended function.

Q: Why do CZRU52C27 and CZRUR52C27 have a narrower operating temperature range?

A: These Comchip Technology parts are specified for -55°C to 125°C operation, compared to the original -65°C to 150°C range. Applications requiring operation at temperatures below -55°C or above 125°C must use alternative substitutes such as BZX584C27-G3-08 or DDZ9711T-7.

Q: What is the advantage of DDZ9711T-7 over other substitutes?

A: The DDZ9711T-7 offers extensive inventory availability (635,400 units), ensuring long-term supply security. It maintains the original operating temperature range (-65°C to 150°C), SOD-523 package compatibility, and ±5% tolerance specification. The 150 mW power rating is suitable for applications not requiring the full 200 mW budget.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (BZX584C27-G3-08, BZT52C27T-TP, CZRU52C27, CZRUR52C27, and DDZ9711T-7) are RoHS3 compliant with moisture sensitivity level 1 (unlimited), matching the original part's compliance status.

Q: Can impedance differences affect circuit performance?

A: Yes. The BZX584C27-G3-08 has an impedance specification of 25 Ohms maximum, compared to 80 Ohms for the original part. Lower impedance provides better voltage regulation and faster transient response. This represents an improvement in performance characteristics and does not create compatibility issues.

Q: What inventory considerations should guide substitute selection?

A: BZX584C27-G3-08 has 975 units available, DDZ9711T-7 has 635,400 units, BZT52C27T-TP has 779 units, CZRU52C27 has 873 units, and CZRUR52C27 has 1,092 units. For applications requiring large quantities or long-term supply assurance, DDZ9711T-7 offers the most extensive inventory availability.

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