BZX84J-B20,115 Equivalent & Substitute Parts

Part Overview

The BZX84J-B20,115 is a 20 V Zener diode manufactured by Nexperia USA Inc., rated for 550 mW power dissipation in a surface mount SOD-323F package. This component is classified as Active product status and carries AEC-Q101 automotive qualification. The device operates across the temperature range of -65°C to 150°C with ±2% voltage tolerance and ROHS3 compliance.

Substitute parts are identified when equivalent electrical performance can be maintained within the specified parameter tolerances while accommodating different packaging formats, power ratings, or manufacturer specifications. Alternative components may be required due to supply constraints, design revisions, or application-specific requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	20	V
Power - Maximum	550	mW
Tolerance	±2%	—
Impedance (Maximum)	20	Ohms
Current - Reverse Leakage @ Vr	50 nA @ 14 V	—
Voltage - Forward (Maximum) @ If	1.1 V @ 100 mA	—
Operating Temperature Range	-65 to 150	°C
Package / Case	SOD-323F	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution eligibility for the BZX84J-B20,115 is determined by the following critical parameters:

Mandatory Matching Criteria:

Voltage - Zener (Nominal): 20 V
Operating Temperature Range: -65°C to 150°C minimum
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Allowable Variation Parameters:

Power - Maximum: Substitute parts must equal or exceed the application requirement; lower power ratings are acceptable only if circuit design permits
Tolerance: Substitute parts with equal or tighter tolerance (lower percentage) are acceptable
Impedance (Maximum): Substitute parts with equal or lower impedance are acceptable
Current - Reverse Leakage: Substitute parts with equal or lower leakage are acceptable
Voltage - Forward: Substitute parts with equal or lower forward voltage are acceptable
Package / Case: SOD-323F, SOD-323, and SOD-523 packages are mechanically compatible within surface mount assembly constraints

Compliance Requirements: All substitute parts must maintain ROHS3 compliance, MSL Level 1 (Unlimited), and REACH Unaffected status.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Power (Max)	Tolerance	Zzt (Max)	Reverse Leakage @ Vr	Vf (Max) @ If	Temp Range	Package
BZX84J-B20,115	Nexperia USA Inc.	20 V	550 mW	±2%	20 Ω	50 nA @ 14 V	1.1 V @ 100 mA	-65 to 150°C	SOD-323F
BZT52C20S-TP	Micro Commercial Co	20 V	200 mW	±6%	55 Ω	100 nA @ 14 V	900 mV @ 10 mA	-65 to 150°C	SOD-323
BZT52C20T-7	Diodes Incorporated	20 V	300 mW	±6%	55 Ω	100 nA @ 14 V	900 mV @ 10 mA	-65 to 150°C	SOD-523
BZT52C20T-TP	Micro Commercial Co	20 V	100 mW	±5%	55 Ω	100 nA @ 14 V	900 mV @ 10 mA	-65 to 150°C	SOD-523
DDZ9707T-7	Diodes Incorporated	20 V	150 mW	±5%	Not Specified	50 nA @ 15.2 V	900 mV @ 10 mA	-65 to 150°C	SOD-523
MM3Z20VB	onsemi	20 V	200 mW	±2%	51 Ω	45 nA @ 14 V	1 V @ 10 mA	-65 to 150°C	SOD-323F
MM3Z20VC	Fairchild Semiconductor	20 V	200 mW	±5%	51 Ω	45 nA @ 14 V	1 V @ 10 mA	-65 to 150°C	SOD-323F

Engineering Selection Recommendations

Direct Package-Compatible Substitutes (SOD-323F):

MM3Z20VB (onsemi) provides the closest electrical equivalence to the BZX84J-B20,115. Both components share identical 20 V nominal voltage, ±2% tolerance, SOD-323F package format, and -65°C to 150°C operating range. The MM3Z20VB exhibits lower reverse leakage (45 nA versus 50 nA) and marginally lower forward voltage (1 V versus 1.1 V), making it a direct functional replacement. Power rating of 200 mW is lower than the primary part; this substitution is valid only when circuit design does not require the full 550 mW dissipation capability.

MM3Z20VC (Fairchild Semiconductor) offers similar package and thermal characteristics with ±5% tolerance. This part is suitable for applications where tolerance relaxation is acceptable.

Alternative Package Substitutes (SOD-523):

BZT52C20T-7 (Diodes Incorporated) provides 300 mW power rating in SOD-523 package. This component maintains 20 V nominal voltage and -65°C to 150°C operating range. The SOD-523 package is mechanically distinct from SOD-323F and requires PCB layout modification. This substitution is applicable when higher power dissipation capacity is required within a smaller footprint.

DDZ9707T-7 (Diodes Incorporated) offers 150 mW rating in SOD-523 package with ±5% tolerance and equivalent reverse leakage characteristics. This part is suitable for lower-power applications.

BZT52C20T-TP (Micro Commercial Co) provides 100 mW rating in SOD-523 package. This substitution applies only to applications with minimal power dissipation requirements.

Lower Power Density Substitute (SOD-323):

BZT52C20S-TP (Micro Commercial Co) delivers 200 mW in SOD-323 package. This component maintains voltage and temperature specifications but exhibits ±6% tolerance and higher impedance (55 Ω). The SOD-323 package differs from SOD-323F; compatibility depends on PCB assembly specifications.

All substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and REACH Unaffected status consistent with the primary component.

Frequently Asked Questions (FAQ)

Q: Can BZT52C20T-7 replace BZX84J-B20,115 in all applications?

A: BZT52C20T-7 maintains the 20 V nominal voltage and -65°C to 150°C operating range required for functional equivalence. However, the SOD-523 package differs mechanically from the SOD-323F package of the primary part. PCB layout and assembly equipment compatibility must be verified. Additionally, the 300 mW power rating is lower than the 550 mW rating of BZX84J-B20,115; applications requiring full power dissipation capacity cannot use this substitute.

Q: What is the difference between SOD-323F and SOD-323 packages?

A: SOD-323F and SOD-323 are distinct surface mount packages with different physical dimensions and lead configurations. SOD-323F is a flat-lead variant, while SOD-323 is a standard variant. PCB footprints are not interchangeable without design modification. Consult package datasheets for specific dimensional requirements.

Q: Is MM3Z20VB suitable for automotive applications?

A: MM3Z20VB is manufactured by onsemi and maintains ROHS3 compliance and MSL Level 1 rating. However, the primary part BZX84J-B20,115 carries AEC-Q101 automotive qualification. MM3Z20VB does not specify AEC-Q101 qualification in the provided data. Automotive applications requiring AEC-Q101 certification must verify qualification status with the manufacturer before substitution.

Q: Can I use a lower power-rated substitute if my circuit only dissipates 200 mW?

A: Yes. Substitute parts with power ratings equal to or exceeding the actual circuit dissipation are acceptable. If circuit analysis confirms maximum dissipation of 200 mW, parts rated for 200 mW or higher (such as MM3Z20VB, MM3Z20VC, or BZT52C20S-TP) are suitable. Parts rated below the actual dissipation requirement (such as BZT52C20T-TP at 100 mW) must not be used.

Q: What does ±2% tolerance mean compared to ±6% tolerance?

A: Tolerance specifies the allowable deviation from the nominal 20 V zener voltage. ±2% tolerance permits deviation of ±0.4 V (range 19.6 V to 20.4 V). ±6% tolerance permits deviation of ±1.2 V (range 18.8 V to 21.2 V). Applications requiring tighter voltage regulation must use parts with lower tolerance percentages. The primary part BZX84J-B20,115 and MM3Z20VB both offer ±2% tolerance; other substitutes offer ±5% or ±6% tolerance.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain ROHS3 compliance, MSL Level 1 (Unlimited) rating, and REACH Unaffected status, consistent with the primary component BZX84J-B20,115.

Q: What is impedance (Zzt) and why does it vary among substitutes?

A: Impedance (Zzt) represents the dynamic resistance of the zener diode at specified operating conditions. Lower impedance indicates better voltage regulation stability. The primary part BZX84J-B20,115 specifies 20 Ω impedance. Substitute parts with higher impedance (such as 55 Ω for BZT52 series) exhibit slightly reduced regulation performance. Applications requiring precise voltage regulation should prioritize substitutes with impedance equal to or lower than the primary part.

Q: Can I substitute BZX84J-B20,115 with DDZ9707T-7 in a high-reliability application?

A: DDZ9707T-7 maintains 20 V nominal voltage, -65°C to 150°C operating range, and ROHS3 compliance. However, the 150 mW power rating is significantly lower than the 550 mW rating of the primary part. Additionally, DDZ9707T-7 does not specify AEC-Q101 automotive qualification. High-reliability applications must verify that actual circuit dissipation does not exceed 150 mW and that AEC-Q101 qualification is not a mandatory requirement before substitution.

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