BZX84C15 Equivalent & Substitute Parts

Part Overview

The BZX84C15 is a surface mount Zener diode rated at 15 V nominal with 350 mW maximum power dissipation in a SOT-23-3 package. Manufactured by onsemi, this component is classified as obsolete product status. Due to its obsolete designation, equivalent and substitute parts with active product status are necessary for new designs and ongoing production requirements. Substitute components maintain the core electrical specifications while offering improved availability and compliance certifications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	15	V
Tolerance	±6%	—
Power - Max	350	mW
Impedance (Max)	30	Ohms
Current - Reverse Leakage @ Vr	50 nA @ 10.5 V	—
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	—
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—

Substitute Part Grouping Explanation

Substitution of the BZX84C15 is determined by the following critical parameters:

Electrical Equivalence Criteria:

Voltage - Zener (Nom): 15 V (exact match required)
Mounting Type: Surface Mount (package form factor compatibility)
Package / Case: SOT-23-3 or TO-236 variants (physical and electrical compatibility)
Power - Max: 250 mW minimum (must support or exceed application requirements)
Operating Temperature Range: Must encompass or exceed -55°C to 150°C

Compliance & Availability Criteria:

Product Status: Active (preferred for new designs and long-term availability)
RoHS Status: ROHS3 Compliant (environmental and regulatory compliance)
Moisture Sensitivity Level: 1 (Unlimited) (handling and storage compatibility)

Substitute parts are grouped into two categories:

Category 1: Direct Electrical Equivalents (SOT-23-3 Surface Mount) Parts maintaining identical zener voltage, similar power ratings, and SOT-23-3 packaging with active product status and RoHS3 compliance.

Category 2: Higher Power Capability (Through-Hole Alternative) The 1N5352BRLG provides 5 W power dissipation for applications requiring higher thermal performance, though it requires through-hole mounting and represents a different package form factor.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Zzt (Max)	Package	Mounting Type	Temp Range	Product Status	RoHS Status
BZX84C15	onsemi	15 V	±6%	350 mW	30 Ω	SOT-23-3	Surface Mount	-55 to 150°C	Obsolete	Not Specified
BZX84C15LT1G	onsemi	15 V	±6%	250 mW	30 Ω	SOT-23-3	Surface Mount	-65 to 150°C	Active	ROHS3 Compliant
BZX84C15LT3G	onsemi	15 V	±6%	225 mW	30 Ω	SOT-23-3	Surface Mount	-65 to 150°C	Active	ROHS3 Compliant
MMBZ5245ELT1G	onsemi	15 V	±5%	225 mW	16 Ω	SOT-23-3	Surface Mount	-55 to 150°C	Active	ROHS3 Compliant
SZBZX84C15LT3G	onsemi	15 V	±5%	250 mW	20 Ω	SOT-23-3	Surface Mount	-65 to 150°C	Active	ROHS3 Compliant
BZX84-C15,215	Nexperia USA Inc.	15 V	±5%	250 mW	30 Ω	SOT-23-3	Surface Mount	-65 to 150°C	Active	ROHS3 Compliant
BZX84-C15,235	Nexperia USA Inc.	15 V	±5%	250 mW	30 Ω	SOT-23-3	Surface Mount	-65 to 150°C	Active	ROHS3 Compliant
BZX84C15 BK PBFREE	Central Semiconductor Corp	15 V	±5%	350 mW	30 Ω	SOT-23-3	Surface Mount	-65 to 150°C	Active	ROHS3 Compliant
BZX84C15 TR PBFREE	Central Semiconductor Corp	15 V	±5%	350 mW	30 Ω	SOT-23-3	Surface Mount	-65 to 150°C	Active	ROHS3 Compliant
BZX84C15_R1_00001	Panjit International Inc.	15 V	±5%	410 mW	30 Ω	SOT-23-3	Surface Mount	-55 to 150°C	Active	ROHS3 Compliant
1N5352BRLG	onsemi	15 V	±5%	5 W	2.5 Ω	Axial	Through Hole	-65 to 200°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Direct Replacement - SOT-23-3 Surface Mount):

BZX84C15LT1G (onsemi) — Active product status with ROHS3 compliance. Maintains 15 V zener voltage and SOT-23-3 package. Power rating of 250 mW is suitable for applications not requiring the full 350 mW of the original part. Extended temperature range (-65 to 150°C) provides improved thermal margin.
BZX84C15 BK PBFREE and BZX84C15 TR PBFREE (Central Semiconductor Corp) — Active product status with ROHS3 compliance. Identical 350 mW power rating and 15 V zener voltage. Available in bulk and tape & reel packaging options. Packaging variants accommodate different procurement and assembly workflows.
SZBZX84C15LT3G (onsemi) — Active product status with AEC-Q101 automotive qualification. Suitable for automotive applications requiring enhanced reliability. 250 mW power rating with improved impedance characteristics (20 Ω vs. 30 Ω).
BZX84-C15,215 and BZX84-C15,235 (Nexperia USA Inc.) — Active product status with AEC-Q101 automotive qualification and ROHS3 compliance. 250 mW power rating. Available in cut tape and tape & reel packaging.

Secondary Substitutes (Reduced Power Rating):

BZX84C15LT3G (onsemi) — 225 mW power rating. Suitable for applications with lower power dissipation requirements. Active product status with ROHS3 compliance.
MMBZ5245ELT1G (onsemi) — 225 mW power rating with improved impedance (16 Ω). Tighter tolerance specification (±5%). Active product status with ROHS3 compliance.

Alternative for Higher Power Applications:

1N5352BRLG (onsemi) — Through-hole axial package with 5 W power dissipation. Applicable only when circuit board layout permits through-hole mounting and higher thermal performance is required. Not a direct replacement due to package form factor difference.

Selection Criteria:

For direct replacement in existing surface mount designs: Select BZX84C15LT1G or BZX84C15 BK PBFREE
For automotive applications: Select SZBZX84C15LT3G or BZX84-C15,215/235
For applications with power constraints below 250 mW: Select BZX84C15LT3G or MMBZ5245ELT1G
For through-hole designs requiring higher power: Select 1N5352BRLG

All recommended substitutes maintain the 15 V zener voltage specification and are RoHS3 compliant with active product status.

Frequently Asked Questions (FAQ)

Q: Can BZX84C15LT1G replace BZX84C15 directly?

A: Yes. BZX84C15LT1G is a direct replacement for surface mount applications. Both components share identical 15 V zener voltage, SOT-23-3 package, and electrical characteristics. The primary difference is product status (active vs. obsolete) and compliance certifications. Power rating is 250 mW versus 350 mW; verify application power requirements do not exceed 250 mW.

Q: What is the difference between BZX84C15LT1G and BZX84C15LT3G?

A: Both are onsemi products with 15 V zener voltage and SOT-23-3 packaging. BZX84C15LT1G is rated 250 mW, while BZX84C15LT3G is rated 225 mW. Both have identical impedance (30 Ω) and reverse leakage characteristics. Selection depends on available power budget in the application.

Q: Are Nexperia BZX84-C15,215 and BZX84-C15,235 interchangeable?

A: Yes. Both Nexperia parts are electrically identical with 15 V zener voltage, 250 mW power rating, and SOT-23-3 packaging. The difference is packaging format: BZX84-C15,215 is supplied in cut tape, while BZX84-C15,235 is supplied in tape & reel. Selection depends on procurement and assembly requirements.

Q: Can I use MMBZ5245ELT1G as a substitute?

A: MMBZ5245ELT1G is compatible for applications where 225 mW power dissipation is acceptable. It maintains 15 V zener voltage and SOT-23-3 packaging. The impedance is lower (16 Ω vs. 30 Ω) and tolerance is tighter (±5% vs. ±6%), which may improve circuit performance in some applications.

Q: Is SZBZX84C15LT3G suitable for automotive applications?

A: Yes. SZBZX84C15LT3G carries AEC-Q101 automotive qualification and is rated for -65 to 150°C operating temperature. It is suitable for automotive-grade designs requiring enhanced reliability and compliance certifications.

Q: Why is 1N5352BRLG listed as a substitute if it uses through-hole mounting?

A: 1N5352BRLG is listed as an alternative for applications requiring higher power dissipation (5 W vs. 350 mW). It maintains the 15 V zener voltage specification but requires through-hole mounting and axial package form factor. It is applicable only when circuit board design permits through-hole assembly.

Q: What does RoHS3 compliance mean for these components?

A: RoHS3 compliance indicates the component meets Restriction of Hazardous Substances Directive requirements, restricting use of lead, cadmium, mercury, and other hazardous materials. All recommended active substitutes carry ROHS3 Compliant designation, ensuring environmental and regulatory compliance for new designs.

Q: Can I mix different manufacturers' parts in the same design?

A: Yes. All recommended substitutes maintain identical 15 V zener voltage and SOT-23-3 packaging. Electrical characteristics are equivalent within specified tolerances. Verify component availability and supply chain continuity when selecting from multiple manufacturers.

Q: What is the significance of the ±5% versus ±6% tolerance difference?

A: Tolerance specifies the allowable deviation from the nominal 15 V zener voltage. ±5% tolerance (tighter) provides better voltage regulation accuracy, while ±6% tolerance (looser) allows wider voltage variation. Select based on circuit voltage regulation requirements.

Q: Are BZX84C15 BK PBFREE and BZX84C15 TR PBFREE the same component?

A: Both are electrically identical 15 V, 350 mW zener diodes in SOT-23-3 packaging from Central Semiconductor Corp. The difference is packaging format: BK PBFREE is supplied in bulk, while TR PBFREE is supplied in tape & reel. Selection depends on procurement volume and assembly process requirements.

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