BZX85C43-TAP Equivalent & Substitute Parts

Part Overview

The BZX85C43-TAP is an active-status Zener diode manufactured by Vishay General Semiconductor - Diodes Division. This component is a 43 V, 1.3 W through-hole Zener diode in DO-41 axial package configuration, qualified to AEC-Q101 automotive standards and compliant with ROHS3 and REACH regulations. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or design flexibility needs while maintaining functional equivalence within specified parameter tolerances.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	43	V
Tolerance	±5	%
Power - Maximum	1.3	W
Impedance (Maximum)	50	Ohms
Current - Reverse Leakage @ Vr	500 nA @ 33 V	nA
Operating Temperature Range	-55 to 175	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AL (DO-41)	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution of the BZX85C43-TAP is determined by equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Zener voltage (Nominal): 43 V with ±5% tolerance
Power dissipation capability: minimum 1.0 W (substitute may be rated lower than 1.3 W if circuit design permits)
Impedance characteristics: maximum 70 Ohms acceptable for functional substitution
Reverse leakage current: specified at comparable reverse voltage conditions

Mechanical Equivalence Criteria:

Package type: DO-41 axial through-hole configuration
Mounting compatibility: through-hole PCB assembly

Compliance Criteria:

RoHS compliance status (ROHS3 or equivalent)
REACH unaffected status
Product status: Active

The substitute part 1N4755A meets these criteria with identical nominal Zener voltage (43 V) and tolerance (±5%), compatible through-hole axial package, and active product status with appropriate regulatory compliance.

Parameter Comparison

Parameter	BZX85C43-TAP (Main)	1N4755A (Substitute)	Compatibility
Voltage - Zener (Nominal)	43 V	43 V	Equivalent
Tolerance	±5%	±5%	Equivalent
Power - Maximum	1.3 W	1.0 W	Substitute rated lower; acceptable if circuit design operates within 1.0 W dissipation
Impedance (Maximum)	50 Ohms	70 Ohms	Substitute impedance higher; acceptable for most applications
Current - Reverse Leakage @ Vr	500 nA @ 33 V	5 µA @ 32.7 V	Substitute leakage current higher; acceptable for general-purpose applications
Operating Temperature Range	-55 to 175°C	-65 to 200°C	Substitute range wider; fully compatible
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	DO-204AL (DO-41)	DO-204AL (DO-41)	Equivalent
RoHS Status	ROHS3 Compliant	RoHS Compliant	Both compliant
REACH Status	REACH Unaffected	REACH Unaffected	Equivalent

Engineering Selection Recommendations

Primary Part Selection: The BZX85C43-TAP is the specified component and should be used when available. It carries AEC-Q101 automotive qualification and ROHS3 compliance, making it suitable for automotive-grade applications requiring formal qualification documentation.

Substitute Part Selection: The 1N4755A is an acceptable substitute when the BZX85C43-TAP is unavailable. Both parts share identical nominal Zener voltage (43 V) and tolerance (±5%), and both are packaged in DO-41 axial through-hole configuration. The 1N4755A carries RoHS compliance and REACH unaffected status, meeting general regulatory requirements.

Application-Specific Considerations:

For circuits designed to operate within 1.0 W power dissipation, the 1N4755A is functionally equivalent
For circuits requiring the full 1.3 W power rating of the BZX85C43-TAP, the substitute may not be suitable
For automotive applications requiring AEC-Q101 qualification, the BZX85C43-TAP is the required choice
The substitute's higher impedance (70 Ohms vs. 50 Ohms) and higher reverse leakage current (5 µA vs. 500 nA) are acceptable for general-purpose voltage regulation and transient suppression applications

Frequently Asked Questions (FAQ)

Q: Can the 1N4755A directly replace the BZX85C43-TAP in all applications?

A: The 1N4755A is functionally equivalent for applications where power dissipation does not exceed 1.0 W. For circuits requiring the full 1.3 W rating or automotive AEC-Q101 qualification, the BZX85C43-TAP is required.

Q: Are there package compatibility issues between these parts?

A: No. Both parts use the DO-41 axial through-hole package (DO-204AL). Physical dimensions and PCB mounting are identical.

Q: What is the impact of the 1N4755A's higher impedance (70 Ohms vs. 50 Ohms)?

A: The higher impedance results in slightly increased voltage regulation ripple and transient response time. For most general-purpose applications, this difference is negligible. High-precision voltage regulation circuits may require evaluation.

Q: Does the 1N4755A meet automotive qualification requirements?

A: The 1N4755A does not carry AEC-Q101 qualification. For automotive applications requiring formal qualification documentation, the BZX85C43-TAP is the appropriate choice.

Q: What is the significance of the higher reverse leakage current in the 1N4755A?

A: The 1N4755A exhibits 5 µA reverse leakage at 32.7 V compared to 500 nA in the BZX85C43-TAP. This difference is acceptable for general-purpose voltage regulation and transient suppression. Applications requiring ultra-low leakage current should use the BZX85C43-TAP.

Q: Are both parts RoHS compliant?

A: Yes. The BZX85C43-TAP is ROHS3 compliant, and the 1N4755A is RoHS compliant. Both meet current regulatory requirements.

Q: What is the temperature operating range difference?

A: The BZX85C43-TAP operates from -55°C to 175°C, while the 1N4755A operates from -65°C to 200°C. The 1N4755A has a wider operating range and is suitable for extended temperature applications.

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