BZW03C15-TAP Equivalent & Substitute Parts

Part Overview

The BZW03C15-TAP is a 15 V, 1.85 W Zener diode manufactured by Vishay General Semiconductor - Diodes Division in SOD-64 axial through-hole packaging. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. The BZW03C15-TAP operates across a temperature range of -65°C to 175°C with ±5% voltage tolerance and is ROHS3 compliant.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	15	V
Tolerance	±5%	—
Power - Maximum	1.85	W
Impedance (Maximum)	2.5	Ohms
Current - Reverse Leakage @ Vr	2 µA @ 11 V	—
Voltage - Forward (Maximum) @ If	1.2 V @ 1 A	—
Operating Temperature Range	-65 to 175	°C
Mounting Type	Through Hole	—
Package / Case	SOD-64, Axial	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the BZW03C15-TAP is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Zener (Nominal): 15 V (exact match required)
Tolerance: ±5% or tighter (±10% acceptable with design review)
Operating Temperature Range: -65°C to 175°C minimum
Mounting Type: Through Hole (axial configuration)

Secondary Considerations:

Power - Maximum: Substitute must equal or exceed 1.85 W for direct replacement; lower power ratings require circuit analysis
Impedance (Maximum): Lower impedance values provide superior performance characteristics
Package / Case: Different package types (DO-35, DO-41, DO-204AH, DO-204AL) are mechanically distinct but electrically compatible when electrical parameters align

Substitute parts are grouped into three categories based on power dissipation capability:

Category A - High Power (≥1.5 W): Direct replacements suitable for applications requiring full 1.85 W capability Category B - Medium Power (1.0 W to 1.25 W): Suitable for applications with moderate power requirements Category C - Low Power (500 mW): Suitable only for low-power applications; not recommended for designs requiring full 1.85 W dissipation

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power Max (W)	Zzt Max (Ω)	Package	Temp Range (°C)	Status	RoHS
BZW03C15-TAP	Vishay	15	±5%	1.85	2.5	SOD-64	-65 to 175	Obsolete	ROHS3
1N4469	Microchip	15	±5%	1.5	9	DO-41	-65 to 175	Active	Non-compliant
1N5929B	Microchip	15	±5%	1.25	9	DO-41	-65 to 175	Active	Non-compliant
1N5929A	Microchip	15	±10%	1.25	9	DO-41	-65 to 175	Active	Non-compliant
1N4744AE3/TR13	Microchip	15	±5%	1	14	DO-41	-65 to 150	Active	ROHS3
1N4109-1	Microchip	15	±5%	0.5	100	DO-35	-65 to 175	Active	—
1N4109	Microchip	15	±5%	0.5	100	DO-35	-65 to 175	Active	Non-compliant
1N965B-1	Microchip	15	±5%	0.5	16	DO-35	-65 to 175	Active	Non-compliant
1N965BE3	Microchip	15	±5%	0.5	16	DO-35	-65 to 175	Active	ROHS3
1N5245	Microchip	15	±5%	0.5	16	DO-35	-65 to 175	Active	ROHS3
1N5245A	Microchip	15	±10%	0.5	16	DO-35	-65 to 175	Active	Non-compliant

Engineering Selection Recommendations

For Direct High-Power Replacement (≥1.5 W requirement):

The 1N4469 is the primary substitute for applications requiring power dissipation near the original 1.85 W specification. This part delivers 1.5 W maximum power with ±5% voltage tolerance and maintains the full -65°C to 175°C operating range. The 1N4469 is active and widely available. However, this part is RoHS non-compliant; designs subject to RoHS requirements must evaluate alternative solutions.

For Moderate Power Applications (1.0 W to 1.25 W):

The 1N5929B provides 1.25 W power dissipation with ±5% tolerance and full temperature range support. This part is active with high inventory availability (32,752 units). The 1N4744AE3/TR13 offers 1 W dissipation with ROHS3 compliance and ±5% tolerance, making it suitable for designs with RoHS requirements and moderate power needs. The 1N4744AE3/TR13 operates to 150°C maximum, which is acceptable for most applications but does not extend to the full 175°C upper limit.

For Low-Power Applications (≤500 mW):

Multiple 500 mW options exist. The 1N965BE3 and 1N5245 both provide ROHS3 compliance with ±5% tolerance and full -65°C to 175°C operation. The 1N965BE3 offers superior impedance characteristics (16 Ohms maximum) compared to 1N4109 variants (100 Ohms maximum). The 1N5245 provides identical electrical performance to 1N965BE3 with equivalent compliance status.

Compliance Considerations:

For designs requiring ROHS3 compliance, select from: 1N4744AE3/TR13, 1N965BE3, or 1N5245. The BZW03C15-TAP original part is ROHS3 compliant; substitutes should maintain this compliance status where possible.

Product Status:

All recommended substitutes are active parts with confirmed inventory availability, eliminating obsolescence risk associated with the BZW03C15-TAP.

Frequently Asked Questions (FAQ)

Q: Can the 1N4469 directly replace the BZW03C15-TAP in all applications?

A: The 1N4469 matches the critical electrical parameters (15 V nominal, ±5% tolerance, -65°C to 175°C operation) and exceeds the power requirement at 1.5 W. However, the package differs (DO-41 versus SOD-64), requiring PCB layout modification. Additionally, the 1N4469 is RoHS non-compliant, which may conflict with design or procurement requirements. Verify RoHS compliance requirements before selection.

Q: What is the difference between 1N5929A and 1N5929B?

A: Both parts are 15 V, 1.25 W Zener diodes in DO-41 packaging with identical electrical performance. The primary difference is voltage tolerance: 1N5929A specifies ±10% tolerance while 1N5929B specifies ±5% tolerance. For applications requiring tighter voltage regulation, select 1N5929B. The 1N5929B has significantly higher inventory (32,752 units versus 760 units).

Q: Are DO-35 and DO-41 packages interchangeable?

A: DO-35 and DO-41 are distinct through-hole axial packages with different physical dimensions. They are not mechanically interchangeable on a PCB without layout redesign. However, they are electrically compatible when electrical parameters match. Verify PCB footprint compatibility before substitution.

Q: Why do some substitutes have lower power ratings than the original part?

A: The BZW03C15-TAP is a high-power Zener diode (1.85 W). Lower-power substitutes (500 mW to 1.25 W) are suitable only for applications that do not require the full 1.85 W dissipation capability. Circuit analysis is required to determine actual power requirements. If the application demands 1.85 W dissipation, only the 1N4469 (1.5 W) provides adequate margin; lower-power parts will overheat and fail.

Q: Which substitute offers the best combination of compliance and availability?

A: The 1N5929B provides ROHS non-compliance status with exceptional inventory (32,752 units), ±5% tolerance, 1.25 W power, and full temperature range. For ROHS3-compliant designs, the 1N965BE3 offers 903 units in stock with identical electrical performance to 1N5245 (5,475 units available). The 1N5245 provides the highest inventory among ROHS3-compliant options.

Q: Can 500 mW parts replace the 1.85 W original in any application?

A: No. 500 mW parts are suitable only for applications with power dissipation below 500 mW. Using a 500 mW part in a 1.85 W application will result in thermal failure. Verify actual circuit power requirements through design analysis before selecting low-power substitutes.

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

A: Impedance (Zzt) is the dynamic impedance of the Zener diode and affects voltage regulation quality. Lower impedance values provide better voltage regulation stability. The original BZW03C15-TAP specifies 2.5 Ohms maximum (excellent). Substitutes range from 9 Ohms (1N4469, 1N5929 series) to 100 Ohms (1N4109 variants). For applications requiring tight voltage regulation, select parts with lower impedance values.

Q: Is the 1N4744AE3/TR13 suitable if my design operates at 175°C?

A: The 1N4744AE3/TR13 specifies a maximum operating temperature of 150°C, not 175°C. If your application requires operation at 175°C, this part is not suitable. Select alternatives with -65°C to 175°C ratings: 1N4469, 1N5929A, 1N5929B, 1N4109, 1N4109-1, 1N965B-1, 1N965BE3, 1N5245, or 1N5245A.

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