BZX84J-B27,115 Equivalent & Substitute Parts

Part Overview

The BZX84J-B27,115 is a 27 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 an active product with AEC-Q101 automotive qualification and ROHS3 compliance. The part is designed for voltage regulation and protection applications requiring precise 27 V reference voltage with ±2% tolerance.

Equivalent and substitute parts are identified when design requirements permit relaxation of specific electrical parameters such as power rating, impedance, or tolerance specifications, while maintaining the core functional voltage regulation capability at 27 V nominal.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	27	V
Tolerance	±2%	—
Power - Max	550	mW
Impedance (Max)	40	Ohms
Current - Reverse Leakage @ Vr	50	nA @ 18.9 V
Voltage - Forward (Vf) (Max) @ If	1.1	V @ 100 mA
Operating Temperature	-65 to 150	°C
Package / Case	SOD-323F	—
Mounting Type	Surface Mount	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution of the BZX84J-B27,115 is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - Zener (Nom): 27 V
Operating Temperature Range: -65°C to 150°C (or compatible subset)
Mounting Type: Surface Mount
RoHS3 Compliance

Allowable Parameter Variations:

Tolerance: May increase from ±2% to ±5% or ±7% depending on circuit requirements
Power - Max: May decrease from 550 mW to lower ratings (200 mW, 150 mW) if thermal dissipation requirements are reduced
Impedance (Max): May vary within acceptable range for the application
Package / Case: SOD-323F, SOD-323, or SOD-523 packages are compatible for surface mount applications
Current - Reverse Leakage: Variations acceptable within specified voltage measurement points

Substitute parts are grouped by package type and power rating to facilitate selection based on specific circuit constraints.

Parameter Comparison

Parameter	BZX84J-B27,115	BZT52C27S-TP	DDZ9711T-7	MM3Z27VB	MM3Z27VC	MMXZ5254B-TP
Manufacturer	Nexperia USA Inc.	Micro Commercial Co	Diodes Incorporated	onsemi	Fairchild Semiconductor	Micro Commercial Co
Voltage - Zener (Nom)	27 V	27 V	27 V	27 V	27 V	27 V
Tolerance	±2%	±7%	±5%	±2%	±5%	±5%
Power - Max	550 mW	200 mW	150 mW	200 mW	200 mW	200 mW
Impedance (Max)	40 Ohms	80 Ohms	—	75 Ohms	75 Ohms	41 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 18.9 V	100 nA @ 18.9 V	50 nA @ 20.4 V	45 nA @ 18.9 V	45 nA @ 18.9 V	100 nA @ 21 V
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 100 mA	900 mV @ 10 mA	900 mV @ 10 mA	1 V @ 10 mA	1 V @ 10 mA	1.2 V @ 100 mA
Operating Temperature	-65 to 150°C	-65 to 150°C	-65 to 150°C	-65 to 150°C	-65 to 150°C	-55 to 150°C
Package / Case	SOD-323F	SOD-323	SOD-523	SOD-323F	SOD-323F	SOD-323
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Substitutes (SOD-323F Package, ±2% Tolerance):

MM3Z27VB is the closest functional equivalent to BZX84J-B27,115. Both parts share identical nominal voltage (27 V), tolerance (±2%), package type (SOD-323F), and operating temperature range (-65°C to 150°C). The primary difference is reduced power rating (200 mW versus 550 mW). This substitute is suitable for applications where thermal dissipation requirements do not exceed 200 mW.

Reduced Power Rating Substitutes (200 mW):

BZT52C27S-TP, MM3Z27VC, and MMXZ5254B-TP are all rated for 200 mW maximum power dissipation. These parts maintain the 27 V nominal voltage and surface mount configuration. Tolerance specifications vary (±7%, ±5%, and ±5% respectively). Selection among these options depends on tolerance requirements and package preference (SOD-323 versus SOD-323F).

Minimum Power Rating Substitute (150 mW):

DDZ9711T-7 is rated for 150 mW maximum power dissipation with ±5% tolerance in a SOD-523 package. This part is suitable only for applications with minimal thermal requirements and where the smaller SOD-523 package is acceptable.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and active product status. The BZX84J-B27,115 carries AEC-Q101 automotive qualification; substitute parts do not explicitly list this qualification in the provided data. Applications requiring automotive-grade certification should verify qualification status with the respective manufacturers.

Temperature Range Limitation:

MMXZ5254B-TP has a reduced lower operating temperature limit (-55°C versus -65°C). This part is not suitable for applications requiring full -65°C to 150°C operation.

Frequently Asked Questions (FAQ)

Q: Can I use MM3Z27VB as a direct replacement for BZX84J-B27,115?

A: MM3Z27VB is functionally compatible for applications where the maximum power dissipation does not exceed 200 mW. Both parts share identical nominal voltage (27 V), tolerance (±2%), package type (SOD-323F), and operating temperature range. If your circuit dissipates more than 200 mW in the Zener diode, the BZX84J-B27,115 with its 550 mW rating is required.

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

A: SOD-323F and SOD-323 are both surface mount packages for small signal diodes. The primary difference is dimensional; SOD-323F is a variant of the SOD-323 package. Both are compatible with standard surface mount assembly processes. Verify PCB footprint compatibility before substitution.

Q: Why do some substitute parts have higher tolerance (±7%) compared to the original (±2%)?

A: Tolerance specification reflects the manufacturing precision of the Zener voltage. Parts with ±7% tolerance (such as BZT52C27S-TP) have wider acceptable voltage variation around the 27 V nominal value. Selection depends on circuit requirements for voltage regulation accuracy. Applications requiring tight voltage control should use parts with ±2% or ±5% tolerance.

Q: Is DDZ9711T-7 suitable for my application?

A: DDZ9711T-7 is suitable only if your circuit dissipates no more than 150 mW in the Zener diode and operates within the -65°C to 150°C temperature range. The SOD-523 package is smaller than SOD-323F, which may affect PCB layout compatibility. Verify power dissipation calculations and package footprint requirements before selection.

Q: Do all substitute parts have the same automotive qualification as the original?

A: The provided data indicates that BZX84J-B27,115 carries AEC-Q101 automotive qualification. Substitute parts do not explicitly list automotive qualification in the provided specifications. Applications requiring automotive-grade components should confirm qualification status directly with the respective manufacturers.

Q: What is the impact of different impedance values on circuit performance?

A: Impedance (Zzt) affects the dynamic response of the Zener diode to load current changes. Lower impedance values (such as 40 Ohms in BZX84J-B27,115 and 41 Ohms in MMXZ5254B-TP) provide better voltage regulation under transient conditions. Higher impedance values (such as 80 Ohms in BZT52C27S-TP) may result in greater voltage ripple. Select based on circuit requirements for voltage stability.

Q: Can I substitute MMXZ5254B-TP if my application operates at -60°C?

A: MMXZ5254B-TP has a minimum operating temperature of -55°C, which is higher than -60°C. This part is not suitable for applications requiring operation below -55°C. Use BZX84J-B27,115 or other substitutes with -65°C minimum rating for full temperature range coverage.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed are ROHS3 compliant except MM3Z27VC, which does not specify RoHS status in the provided data. Verify compliance documentation with the manufacturer if ROHS3 certification is required for your application.

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