BZX55C56-TAP Equivalent & Substitute Parts

Part Overview

The BZX55C56-TAP is a Zener diode rated at 56 V nominal voltage with 500 mW maximum power dissipation, packaged in a DO-204AH (DO-35) axial through-hole configuration. Manufactured by Vishay General Semiconductor - Diodes Division, this component is classified as Active and carries AEC-Q101 automotive qualification. The device operates across a temperature range of -65°C to 175°C and maintains ROHS3 compliance with unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and regulatory compliance can be maintained while accommodating variations in tolerance specifications or inventory availability.

Substiute Parts

BZX55C56-TAP

Vishay General Semiconductor - Diodes DivisionIn Stock: 10431BZX55C56-TAP Datasheet

Current PartRFQ

BZX55B56-TAP

Vishay General Semiconductor - Diodes DivisionIn Stock: 29895BZX55B56-TAP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BZX55C56-TAP is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Parameters:

• Zener voltage (nominal): 56 V
• Maximum power dissipation: 500 mW
• Package type: DO-204AH (DO-35) axial through-hole
• Operating temperature range: -65°C to 175°C
• Reverse leakage current @ 43 V: 100 nA
• Forward voltage @ 200 mA: 1.5 V maximum
• Impedance (maximum): 135 Ohms
• Automotive grade and AEC-Q101 qualification
• ROHS3 compliance

Allowable Variation Parameters:

• Tolerance specification: Tighter tolerance (±2%) is acceptable as a substitute for ±5% tolerance

The BZX55B56-TAP qualifies as a parametric equivalent because it maintains all mandatory electrical and mechanical specifications while offering improved tolerance performance (±2% versus ±5%).

Parameter Comparison

Engineering Selection Recommendations

BZX55C56-TAP (Primary Selection)

The BZX55C56-TAP is the specified component with Active product status and full AEC-Q101 automotive qualification. Selection of this part is appropriate for applications requiring the stated ±5% tolerance specification and where the primary part number is contractually or design-specified.

BZX55B56-TAP (Substitute Selection)

The BZX55B56-TAP is a direct parametric equivalent with identical electrical performance and mechanical compatibility. This substitute part is appropriate when:

• The primary part (BZX55C56-TAP) is unavailable or subject to extended lead times
• Circuit design tolerates or benefits from the tighter ±2% tolerance specification
• Inventory or supply chain considerations favor the substitute
• Both parts maintain identical automotive grade and AEC-Q101 qualification status
• ROHS3 compliance and regulatory requirements are satisfied by both parts

Both parts are manufactured by the same supplier (Vishay General Semiconductor - Diodes Division) within the same BZX55 series, ensuring consistent quality and performance characteristics.

Frequently Asked Questions (FAQ)

Q: Can BZX55B56-TAP replace BZX55C56-TAP in all applications?

A: Yes. The BZX55B56-TAP maintains all critical electrical parameters (56 V nominal zener voltage, 500 mW power rating, 135 Ohms maximum impedance, 100 nA reverse leakage, 1.5 V forward voltage) and mechanical specifications (DO-204AH axial through-hole package). The tighter ±2% tolerance of the substitute is compatible with circuits designed for ±5% tolerance.

Q: What is the primary difference between these two parts?

A: The sole difference is the tolerance specification. BZX55C56-TAP carries ±5% tolerance, while BZX55B56-TAP carries ±2% tolerance. All other electrical and mechanical parameters are identical.

Q: Are both parts automotive-qualified?

A: Yes. Both BZX55C56-TAP and BZX55B56-TAP carry AEC-Q101 automotive qualification and Automotive grade classification, suitable for automotive applications requiring this certification.

Q: Do these parts have the same package and mounting requirements?

A: Yes. Both parts use the DO-204AH (DO-35) axial through-hole package with identical mechanical dimensions and mounting characteristics. No PCB layout or assembly process changes are required when substituting between these parts.

Q: Are there any compliance or regulatory differences?

A: No. Both parts are ROHS3 compliant, carry MSL 1 (Unlimited) moisture sensitivity rating, and are REACH Unaffected. Regulatory and environmental compliance is equivalent.

Q: What is the operating temperature range for both parts?

A: Both parts operate across -65°C to 175°C, providing identical thermal performance specifications.

Q: Can I use BZX55C56-TAP as a substitute for BZX55B56-TAP?

A: Yes. BZX55C56-TAP can substitute for BZX55B56-TAP in applications where the ±5% tolerance is acceptable. However, applications specifically requiring ±2% tolerance should use BZX55B56-TAP.