BZX584C20-V-G-08 Equivalent & Substitute Parts

Part Overview

The BZX584C20-V-G-08 is a 20 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 and substitute components for new designs and ongoing production requirements. Equivalent parts maintain identical electrical specifications, while substitute parts provide functional alternatives with modified parameters within acceptable application ranges.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	20	V
Tolerance	±5%	—
Power - Max	200	mW
Impedance (Max)	55	Ohms
Current - Reverse Leakage @ Vr	50	nA @ 14 V
Operating Temperature	-65 to 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 BZX584C20-V-G-08 is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 20 V nominal
Package type: SOD-523 surface mount (SC-79)
Mounting type: Surface mount
RoHS3 compliance
Moisture sensitivity level: 1 (Unlimited)

Secondary Compatibility Parameters:

Power dissipation capacity (200 mW minimum for direct equivalence; higher ratings acceptable for substitution)
Voltage tolerance (±5% preferred; ±6% acceptable for substitution)
Impedance (55 Ohms nominal; variations acceptable within application requirements)
Reverse leakage current (50 nA baseline; higher values acceptable for substitution)
Operating temperature range (-65°C to 150°C preferred; narrower ranges acceptable for substitution)

Substitute parts may deviate in power rating, impedance, leakage current, and temperature range while maintaining the core 20 V zener voltage specification and SOD-523 package compatibility.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Ir @ Vr (nA)	Temp Range (°C)	Package	Status
BZX584C20-V-G-08	Vishay	20	±5%	200	55	50 @ 14V	-65 to 150	SOD-523	Obsolete
BZX584C20-G3-08	Vishay	20	±5%	200	15	50 @ 14V	-65 to 150	SOD-523	Active
BZT52C20T-7	Diodes Incorporated	20	±6%	300	55	100 @ 14V	-65 to 150	SOD-523	Active
BZT52C20T-TP	Micro Commercial Co	20	±5%	100	55	100 @ 14V	-65 to 150	SOD-523	Active
CZRU52C20	Comchip Technology	20	±5%	150	50	100 @ 15V	-55 to 125	0603/SOD-523F	Active
CZRUR52C20	Comchip Technology	20	±5%	150	50	100 @ 15V	-55 to 125	0603/SOD-523F	Active
DDZ9707T-7	Diodes Incorporated	20	±5%	150	—	50 @ 15.2V	-65 to 150	SOD-523	Active

Engineering Selection Recommendations

Direct Equivalent (Preferred for Replacement):

BZX584C20-G3-08 is the primary direct equivalent. This part maintains identical electrical specifications (20 V, ±5%, 200 mW) and operating temperature range (-65°C to 150°C) as the obsolete BZX584C20-V-G-08. Both are manufactured by Vishay within the same BZX584C series. The BZX584C20-G3-08 is active and available in volume production. The impedance improvement (15 Ohms versus 55 Ohms) provides superior performance characteristics. This part is recommended for direct substitution in existing designs.

Active Substitutes (Functional Alternatives):

BZT52C20T-7 (Diodes Incorporated) provides 300 mW power rating with identical 20 V zener voltage and -65°C to 150°C operating range. The ±6% tolerance and 100 nA leakage current represent minor deviations acceptable for most applications. This part offers increased power headroom for designs requiring higher dissipation margins.

BZT52C20T-TP (Micro Commercial Co) is a manufacturer-recommended substitute with 100 mW power rating. This part is suitable for applications with lower power requirements. The ±5% tolerance and -65°C to 150°C operating range match the original specification. Selection of this part requires confirmation that 100 mW power dissipation is sufficient for the application.

DDZ9707T-7 (Diodes Incorporated) provides 150 mW power rating with ±5% tolerance and -65°C to 150°C operating range. This part represents a mid-range power option between the original 200 mW specification and lower-power alternatives.

Package-Variant Substitutes:

CZRU52C20 and CZRUR52C20 (Comchip Technology) are functionally equivalent 20 V zener diodes with 150 mW power rating and ±5% tolerance. These parts utilize 0603/SOD-523F package format, which differs from the standard SOD-523 package of the original part. Operating temperature range is -55°C to 125°C, narrower than the original -65°C to 150°C specification. These parts are suitable only for applications where the reduced temperature range and alternative package format are acceptable.

Compliance Status:

All substitute parts maintain ROHS3 compliance, moisture sensitivity level 1 (Unlimited), and REACH unaffected status, matching the regulatory profile of the original BZX584C20-V-G-08.

Frequently Asked Questions (FAQ)

Q: Can BZX584C20-G3-08 be used as a direct replacement for BZX584C20-V-G-08?

A: Yes. BZX584C20-G3-08 is the direct equivalent. Both parts share identical zener voltage (20 V), tolerance (±5%), power rating (200 mW), operating temperature range (-65°C to 150°C), and SOD-523 package. The BZX584C20-G3-08 is active and available in production quantities.

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

A: SOD-523 (SC-79) and 0603/SOD-523F are distinct surface mount package formats. SOD-523 is a smaller, two-terminal package. The 0603 designation refers to a rectangular chip component format (0.06" × 0.03"). Parts specified for 0603/SOD-523F package cannot be substituted into designs requiring standard SOD-523 footprints without PCB layout modification.

Q: Can BZT52C20T-TP (100 mW) replace the 200 mW BZX584C20-V-G-08?

A: BZT52C20T-TP can replace the original part only if the application power dissipation does not exceed 100 mW. The 20 V zener voltage, ±5% tolerance, and -65°C to 150°C operating range are compatible. Applications requiring the full 200 mW dissipation capacity must use higher-power alternatives such as BZT52C20T-7 (300 mW) or DDZ9707T-7 (150 mW).

Q: What is the significance of impedance (Zzt) differences between substitute parts?

A: Impedance affects the zener diode's dynamic response and voltage regulation characteristics. The original BZX584C20-V-G-08 specifies 55 Ohms maximum impedance. BZX584C20-G3-08 provides lower impedance (15 Ohms), resulting in improved voltage regulation. Higher impedance values (such as in BZT52C20T-7 at 55 Ohms) maintain equivalent performance. Impedance selection depends on circuit requirements for voltage stability and transient response.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance, matching the regulatory status of the original BZX584C20-V-G-08. All parts are also REACH unaffected and carry EAR99 ECCN classification.

Q: What is the operating temperature range limitation for CZRU52C20 and CZRUR52C20?

A: CZRU52C20 and CZRUR52C20 operate within -55°C to 125°C range, which is narrower than the original -65°C to 150°C specification. These parts are unsuitable for applications requiring operation below -55°C or above 125°C. Applications with extended temperature requirements must select alternatives such as BZX584C20-G3-08, BZT52C20T-7, BZT52C20T-TP, or DDZ9707T-7.

Q: How does reverse leakage current affect part selection?

A: Reverse leakage current (Ir) represents the small current flowing through the zener diode in reverse bias condition. The original BZX584C20-V-G-08 specifies 50 nA at 14 V. Substitute parts with higher leakage currents (such as BZT52C20T-7 and BZT52C20T-TP at 100 nA) are acceptable for most applications. Selection depends on circuit sensitivity to leakage current in high-impedance applications.

Q: What inventory status should influence part selection?

A: BZX584C20-G3-08 (7,944 pcs), BZT52C20T-7 (16,080 pcs), and BZT52C20T-TP (8,870 pcs) maintain substantial active inventory. CZRUR52C20 (1,153 pcs) and DDZ9707T-7 (6,100 pcs) have lower availability. For production designs, parts with higher inventory levels provide supply chain stability.

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