BZX84C15TA Equivalent & Substitute Parts

Part Overview

The BZX84C15TA is a 15 V Zener diode rated at 350 mW in a surface mount SOT-23-3 package, manufactured by Diodes Incorporated. This component is classified as obsolete, indicating discontinuation from the manufacturer. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing 15 V Zener regulation in compact surface mount form factors.

Key Parameters

Parameter	BZX84C15TA
Voltage - Zener (Nom)	15 V
Tolerance	±5%
Power - Max	350 mW
Impedance (Max)	30 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 10 V
Operating Temperature	-55°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the BZX84C15TA is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Zener (Nom): 15 V (exact match required)
Mounting Type: Surface Mount
Package / Case: TO-236-3, SC-59, SOT-23-3 (mechanical compatibility)
Impedance (Max): 30 Ohms (electrical performance)

Secondary Compatibility Factors:

Tolerance: ±5% to ±6% (acceptable variance)
Power - Max: 250 mW to 410 mW (substitutes rated at or above 250 mW are functionally compatible; the original 350 mW rating provides design margin)
Operating Temperature: -55°C to -65°C minimum; 150°C maximum (all substitutes meet or exceed the original range)
Current - Reverse Leakage: 50 nA to 100 nA @ specified voltage (within acceptable limits)

All substitute parts listed maintain the 15 V nominal Zener voltage and SOT-23-3 package compatibility. Substitutes with lower power ratings (225 mW to 300 mW) are suitable for applications where the original 350 mW rating provides design margin. Substitutes with higher power ratings (410 mW) offer enhanced thermal performance.

Parameter Comparison

Part Number	Manufacturer	Voltage - Zener (Nom)	Tolerance	Power - Max	Impedance (Max)	Current - Reverse Leakage @ Vr	Operating Temperature	Product Status	RoHS Status
BZX84C15TA	Diodes Incorporated	15 V	±5%	350 mW	30 Ohms	50 nA @ 10 V	-55°C ~ 150°C	Obsolete	RoHS non-compliant
BZX84C15-7-F	Diodes Incorporated	15 V	±6%	300 mW	30 Ohms	100 nA @ 10.5 V	-65°C ~ 150°C	Active	ROHS3 Compliant
BZX84-C15,215	Nexperia USA Inc.	15 V	±5%	250 mW	30 Ohms	50 nA @ 10.5 V	-65°C ~ 150°C	Active	ROHS3 Compliant
BZX84-C15,235	Nexperia USA Inc.	15 V	±5%	250 mW	30 Ohms	50 nA @ 10.5 V	-65°C ~ 150°C	Active	ROHS3 Compliant
BZX84C15_R1_00001	Panjit International Inc.	15 V	±5%	410 mW	30 Ohms	100 nA @ 10.5 V	-55°C ~ 150°C	Active	ROHS3 Compliant
BZX84C15LT1G	onsemi	15 V	±6%	250 mW	30 Ohms	50 nA @ 10.5 V	-65°C ~ 150°C	Active	ROHS3 Compliant
BZX84C15LT3G	onsemi	15 V	±6%	225 mW	30 Ohms	50 nA @ 10.5 V	-65°C ~ 150°C	Active	ROHS3 Compliant
MMBZ5245BLT1G	onsemi	15 V	±5%	225 mW	16 Ohms	100 nA @ 11 V	-65°C ~ 150°C	Active	ROHS3 Compliant
MMBZ5245ELT1G	onsemi	15 V	±5%	225 mW	16 Ohms	100 nA @ 11 V	-55°C ~ 150°C	Active	ROHS3 Compliant
SZBZX84C15LT1G	onsemi	15 V	±6%	225 mW	30 Ohms	50 nA @ 10.5 V	-65°C ~ 150°C	Active	ROHS3 Compliant
SZBZX84C15LT3G	onsemi	15 V	±5%	250 mW	20 Ohms	50 nA @ 10.5 V	-65°C ~ 150°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Compliance and Regulatory Status:

All substitute parts listed are ROHS3 compliant, addressing the RoHS non-compliance status of the obsolete BZX84C15TA. This compliance is mandatory for new designs and ongoing production in regulated markets.

Product Status Considerations:

The BZX84C15TA is obsolete. All substitute parts maintain active product status with established supply chains and manufacturer support. Selection should prioritize active parts to ensure long-term availability and design continuity.

Automotive-Grade Options:

For applications requiring automotive qualification, the following substitutes carry AEC-Q101 certification:

BZX84C15-7-F (Diodes Incorporated)
BZX84-C15,215 (Nexperia USA Inc.)
BZX84-C15,235 (Nexperia USA Inc.)
SZBZX84C15LT1G (onsemi)
SZBZX84C15LT3G (onsemi)

Power Rating Alignment:

Direct Power Match (300-350 mW): BZX84C15-7-F (300 mW) provides the closest power rating to the original 350 mW specification.
Enhanced Power Performance (410 mW): BZX84C15_R1_00001 (Panjit) offers higher power dissipation capability for thermally demanding applications.
Conservative Power Rating (225-250 mW): Remaining substitutes operate at reduced power levels; suitable for applications where the original 350 mW rating provides design margin.

Impedance Characteristics:

Most substitutes maintain the 30 Ohms impedance specification. MMBZ5245BLT1G and MMBZ5245ELT1G feature lower impedance (16 Ohms), providing improved voltage regulation performance in certain circuit topologies.

Temperature Range:

All substitutes support the full -55°C to 150°C operating range of the original part, with most extending the minimum temperature to -65°C for enhanced cold-weather performance.

Frequently Asked Questions (FAQ)

Q: Can I directly replace BZX84C15TA with any of the listed substitutes?

A: Yes, all listed substitutes are mechanically and electrically compatible. They maintain the 15 V nominal Zener voltage, SOT-23-3 package form factor, and equivalent electrical performance. Verify that the power rating and impedance characteristics align with your circuit requirements.

Q: What is the primary difference between the substitute parts?

A: Substitute parts vary in power dissipation rating (225 mW to 410 mW), impedance (16 Ohms to 30 Ohms), tolerance (±5% to ±6%), and regulatory certifications. These differences allow selection based on specific thermal, electrical, and compliance requirements.

Q: Which substitute offers the best compliance for new designs?

A: All substitutes are ROHS3 compliant. For automotive applications, select parts with AEC-Q101 qualification: BZX84C15-7-F, BZX84-C15,215, BZX84-C15,235, SZBZX84C15LT1G, or SZBZX84C15LT3G.

Q: Does the lower power rating of some substitutes affect circuit performance?

A: Substitutes with lower power ratings (225-250 mW) are suitable when the original 350 mW rating provides design margin. Verify that your circuit's maximum power dissipation does not exceed the substitute's rated power. For thermally constrained applications, select BZX84C15-7-F (300 mW) or BZX84C15_R1_00001 (410 mW).

Q: Are there packaging differences between substitutes?

A: All substitutes use the SOT-23-3 package (TO-236-3, SC-59). Packaging format varies between Cut Tape (CT), Digi-Reel, and Tape & Reel (TR). Verify packaging compatibility with your procurement and assembly processes.

Q: What is the significance of impedance variation among substitutes?

A: Impedance affects voltage regulation performance under load transients. The original 30 Ohms specification is maintained by most substitutes. MMBZ5245BLT1G and MMBZ5245ELT1G feature 16 Ohms impedance, providing superior regulation in applications with rapid load changes.

Q: Can I use MMBZ5245 series parts as direct replacements?

A: MMBZ5245BLT1G and MMBZ5245ELT1G are functionally compatible 15 V Zener diodes in SOT-23-3 packages. They feature lower impedance (16 Ohms) and reduced power rating (225 mW). Use these substitutes when impedance performance is critical and power dissipation is within acceptable limits.

Q: Which substitute has the highest inventory availability?

A: BZX84C15LT1G (onsemi) has the highest inventory at 365,100 pieces. BZX84-C15,235 (Nexperia) offers 54,038 pieces. Both are active products with established supply chains.

Q: Do all substitutes support the full -55°C to 150°C temperature range?

A: Yes. The original BZX84C15TA operates from -55°C to 150°C. All substitutes support this range, with most extending the minimum temperature to -65°C for enhanced cold-weather performance.

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