BZX55B13-TAP Equivalent & Substitute Parts

Part Overview

The BZX55B13-TAP is a 13 V, 500 mW Zener diode manufactured by Vishay General Semiconductor - Diodes Division in the DO-35 (DO-204AH) axial through-hole package. This component is classified as an active product with AEC-Q101 automotive qualification and ROHS3 compliance. Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and operational specifications are required due to supply constraints, design flexibility, or manufacturing discontinuation of the primary component.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	13	V
Tolerance	±2%	-
Power - Maximum	500	mW
Impedance (Maximum)	26	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 10 V
Voltage - Forward (Maximum) @ If	1.5	V @ 200 mA
Operating Temperature Range	-65 to 175	°C
Mounting Type	Through Hole	-
Package / Case	DO-204AH (DO-35)	-

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 13 V nominal
Package type: DO-35 (DO-204AH) axial through-hole
Power rating: 500 mW or greater
Operating temperature range: minimum -65°C to 175°C

Secondary Compatibility Factors:

Tolerance: ±2% to ±5% acceptable
Impedance: 13 to 30 Ohms
Reverse leakage current: 100 to 500 nA
Forward voltage: 0.9 to 1.5 V @ specified current

Substitute parts are grouped into two categories based on power rating alignment:

Group 1 (500 mW Rating): 1N5243B, 1N5243B TR PBFREE, 1N5243BTR, BZX79C13-T50A

Group 2 (400 mW Rating): BZX79-B13,113, BZX79-B13,133

Group 2 parts operate at reduced maximum power dissipation and are suitable for applications where the 500 mW rating is not required.

Parameter Comparison

Parameter	BZX55B13-TAP	1N5243B	1N5243B TR PBFREE	1N5243BTR	BZX79-B13,113	BZX79-B13,133	BZX79C13-T50A
Manufacturer	Vishay	Microchip	Central Semiconductor	Fairchild	Nexperia USA	NXP USA	onsemi
Voltage - Zener (Nom)	13 V	13 V	13 V	13 V	13 V	13 V	13 V
Tolerance	±2%	±5%	±5%	±5%	±2%	±2%	±5%
Power - Max	500 mW	500 mW	500 mW	500 mW	400 mW	400 mW	500 mW
Impedance (Max)	26 Ω	13 Ω	13 Ω	13 Ω	30 Ω	30 Ω	30 Ω
Current - Reverse Leakage @ Vr	100 nA @ 10 V	500 nA @ 9.9 V	500 nA @ 9.9 V	500 nA @ 9.9 V	100 nA @ 8 V	100 nA @ 8 V	100 nA @ 8 V
Voltage - Forward (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	1.1 V @ 200 mA	1.2 V @ 200 mA	900 mV @ 10 mA	900 mV @ 10 mA	1.5 V @ 100 mA
Operating Temperature	-65 to 175°C	-65 to 175°C	-65 to 200°C	-65 to 200°C	-65 to 200°C	-65 to 200°C	-65 to 200°C
Package / Case	DO-204AH (DO-35)	DO-204AH (DO-35)	DO-35 (DO-204AH)	DO-35 (DO-204AH)	DO-204AH (DO-35)	DO-204AH (DO-35)	DO-35
RoHS Status	ROHS3 Compliant	RoHS Non-compliant	ROHS3 Compliant	Not Specified	ROHS3 Compliant	Not Specified	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (500 mW, ±2% Tolerance, ROHS3 Compliant):

BZX79C13-T50A (onsemi) is the preferred substitute when maintaining the original power rating, tolerance specification, and regulatory compliance. This part matches the BZX55B13-TAP across all critical electrical parameters and extends the operating temperature range to 200°C.

For 500 mW Applications with Relaxed Tolerance (±5%):

1N5243B TR PBFREE (Central Semiconductor Corp) provides ROHS3 compliance with improved forward voltage characteristics (1.1 V @ 200 mA) and extended temperature range (-65 to 200°C). This part is suitable when ±5% zener voltage tolerance is acceptable.

1N5243BTR (Fairchild Semiconductor) and 1N5243B (Microchip Technology) are functionally equivalent alternatives with ±5% tolerance. The Microchip part is RoHS non-compliant and should be evaluated against regulatory requirements.

For 400 mW Applications with ±2% Tolerance:

BZX79-B13,113 (Nexperia USA Inc.) and BZX79-B13,133 (NXP USA Inc.) are suitable when the application power dissipation does not exceed 400 mW. Both parts maintain ±2% tolerance and ROHS3 compliance. The BZX79-B13,133 offers significantly higher inventory availability (83,442 units).

Compliance Considerations:

All recommended substitutes maintain EAR99 export classification and REACH Unaffected status. ROHS3 compliance is confirmed for BZX55B13-TAP, 1N5243B TR PBFREE, BZX79-B13,113, BZX79-B13,133, and BZX79C13-T50A. Applications requiring automotive qualification should reference AEC-Q101 certification status during final component selection.

Frequently Asked Questions (FAQ)

Q: Can 1N5243B (Microchip) be used as a direct replacement for BZX55B13-TAP?

A: 1N5243B matches the 13 V nominal voltage, 500 mW power rating, and DO-35 package. However, it differs in tolerance (±5% versus ±2%), impedance (13 Ω versus 26 Ω), and reverse leakage current (500 nA versus 100 nA). It is also RoHS non-compliant. Substitution is acceptable only when these parameter variations are within circuit design tolerances and regulatory requirements permit non-compliant components.

Q: What is the difference between BZX79-B13,113 and BZX79-B13,133?

A: Both parts are electrically identical 13 V, 400 mW, ±2% Zener diodes in DO-35 packages. The primary difference is packaging format: BZX79-B13,113 is supplied in Cut Tape (CT), while BZX79-B13,133 is supplied in Bulk. BZX79-B13,133 has significantly higher inventory availability (83,442 units versus 10,096 units).

Q: Can BZX79-B13,113 or BZX79-B13,133 replace BZX55B13-TAP in a 500 mW application?

A: No. These parts are rated for 400 mW maximum power dissipation, compared to 500 mW for the BZX55B13-TAP. Use of these parts in applications requiring 500 mW operation will result in component overstress and potential failure. They are suitable only for applications where power dissipation does not exceed 400 mW.

Q: Does 1N5243B TR PBFREE offer advantages over other 500 mW substitutes?

A: 1N5243B TR PBFREE (Central Semiconductor Corp) provides three advantages: ROHS3 compliance, improved forward voltage (1.1 V @ 200 mA versus 1.5 V), and extended operating temperature range (-65 to 200°C). The lower forward voltage may reduce power dissipation in forward-biased applications. Tolerance is ±5%, which is wider than the original ±2%.

Q: Are all substitute parts available in the same packaging format as BZX55B13-TAP?

A: BZX55B13-TAP is supplied in Cut Tape (CT) packaging. Substitute parts are available in multiple formats: 1N5243B (unspecified), 1N5243B TR PBFREE (Cut Tape), 1N5243BTR (Bulk), BZX79-B13,113 (Cut Tape), BZX79-B13,133 (Bulk), and BZX79C13-T50A (Cut Tape). Verify packaging format compatibility with assembly equipment and procurement requirements.

Q: What is the significance of the impedance difference between BZX55B13-TAP (26 Ω) and 1N5243B (13 Ω)?

A: Impedance affects dynamic resistance and voltage regulation performance. Lower impedance (13 Ω) provides better voltage regulation under load changes. Higher impedance (26 Ω) may result in greater voltage variation with current fluctuations. Selection depends on circuit requirements for voltage stability and transient response.

Q: Is automotive qualification required for all applications?

A: BZX55B13-TAP carries AEC-Q101 automotive qualification. Substitute parts do not explicitly list automotive qualification in the provided specifications. Applications requiring automotive-grade components should confirm qualification status with manufacturers before substitution.

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