BZX55A13-TAP Equivalent & Substitute Parts

Part Overview

The BZX55A13-TAP is a 13 V, 500 mW Zener diode manufactured by Vishay General Semiconductor - Diodes Division in the DO-35 axial through-hole package. This component is classified as obsolete, though 914 pieces remain in stock. The part is qualified to AEC-Q101 automotive standards and complies with ROHS3 and REACH regulations.

Due to the obsolete product status of the BZX55A13-TAP, identifying equivalent and substitute parts is necessary to ensure design continuity and supply chain reliability. Active alternatives with matching or superior electrical characteristics are available from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	13	V
Power - Maximum	500	mW
Tolerance	±1%	—
Impedance (Maximum)	26	Ohms
Mounting Type	Through Hole	—
Package / Case	DO-204AH (DO-35), Axial	—
Operating Temperature Range	Up to 175	°C
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution of the BZX55A13-TAP is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 13 V nominal
Power dissipation: 500 mW maximum
Package type: DO-35 axial through-hole
Mounting configuration: Through-hole

Secondary Compatibility Factors:

Tolerance specification (±1%, ±2%, ±5%, or ±10%)
Impedance characteristics
Operating temperature range
Forward voltage characteristics
Reverse leakage current specifications
Product status (active vs. obsolete)
Compliance certifications (AEC-Q101, ROHS3)

Substitute parts are grouped by tolerance class, as this parameter directly affects circuit performance in voltage regulation applications. Parts with tighter tolerances (±1%, ±2%) provide superior voltage stability, while parts with wider tolerances (±5%, ±10%) offer cost optimization for less critical applications.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Vf @ If (V @ mA)	Temp Range (°C)	Status	AEC-Q101	ROHS3
BZX55A13-TAP	Vishay	13	±1%	500	26	1.5 @ 200	—175	Obsolete	Yes	Yes
BZX55B13-TAP	Vishay	13	±2%	500	26	1.5 @ 200	-65–175	Active	Yes	Yes
1N3521A	Microchip	13	±5%	500	12	1.1 @ 200	-65–175	Active	No	No
1N5739B	Microchip	13	±5%	500	30	0.9 @ 10	-65–175	Active	No	No
1N5739C	Microchip	13	±1%	500	30	0.9 @ 10	-65–175	Active	No	No
1N5739D	Microchip	13	±1%	500	30	0.9 @ 10	-65–175	Active	No	No
1N6003A	Microchip	13	±10%	500	36	1.1 @ 200	-65–175	Active	No	No
1N6003C	Microchip	13	±2%	500	25	1.1 @ 200	-65–175	Active	No	No
BZX79C13-T50A	onsemi	13	±5%	500	30	1.5 @ 100	-65–200	Active	No	Yes

Engineering Selection Recommendations

For Direct Replacement with Highest Compliance:

BZX55B13-TAP is the primary substitute. This part maintains Vishay manufacturing, AEC-Q101 qualification, and ROHS3 compliance. The tolerance specification increases from ±1% to ±2%, and the operating temperature range expands to -65°C to 175°C. Electrical parameters remain identical to the original part. Product status is active with 4922 units in stock.

For Active Alternatives with Matching Tolerance (±1%):

1N5739C and 1N5739D (Microchip Technology) both provide ±1% tolerance matching the original BZX55A13-TAP specification. These parts are active and widely available (1063 and 1096 units respectively). However, they do not carry AEC-Q101 qualification or ROHS3 compliance. Impedance is specified at 30 Ohms versus 26 Ohms on the original part. Forward voltage is specified at 0.9 V @ 10 mA rather than 1.5 V @ 200 mA.

For Cost-Optimized Alternatives:

1N6003A (Microchip Technology) offers a ±10% tolerance specification with active product status and 917 units in stock. This part is suitable for applications where voltage regulation tolerance is not critical. Impedance is 36 Ohms.

For Extended Temperature Range:

BZX79C13-T50A (onsemi) extends the operating temperature range to -65°C to 200°C, providing 25°C additional high-temperature capability. This part maintains ROHS3 compliance and has the highest inventory availability (9926 units). Tolerance is ±5%.

Compliance Considerations:

The original BZX55A13-TAP carries AEC-Q101 automotive qualification and ROHS3 compliance. Only BZX55B13-TAP and BZX79C13-T50A maintain ROHS3 compliance among active substitutes. Microchip alternatives (1N3521A, 1N5739 series, 1N6003 series) are RoHS non-compliant. For automotive applications requiring AEC-Q101 qualification, BZX55B13-TAP is the only active substitute that maintains this certification.

Frequently Asked Questions (FAQ)

Q: Can I use BZX55B13-TAP as a direct replacement for BZX55A13-TAP?

A: Yes. BZX55B13-TAP is functionally equivalent with the following differences: tolerance increases from ±1% to ±2%, and operating temperature range expands from unspecified minimum to -65°C minimum. All other electrical parameters are identical. Both parts are Vishay products with AEC-Q101 qualification and ROHS3 compliance.

Q: What is the difference between ±1% and ±2% tolerance in Zener diodes?

A: Tolerance specifies the allowable deviation from the nominal 13 V Zener voltage. A ±1% part maintains voltage between 12.87 V and 13.13 V. A ±2% part maintains voltage between 12.74 V and 13.26 V. Tighter tolerance (±1%) provides superior voltage regulation stability in precision applications.

Q: Are Microchip 1N5739 and 1N6003 series parts suitable for automotive applications?

A: These parts are not AEC-Q101 qualified and are RoHS non-compliant. They are not recommended for automotive applications requiring these certifications. For automotive use, select BZX55B13-TAP or BZX79C13-T50A.

Q: What does impedance (Zzt) represent in Zener diode specifications?

A: Impedance is the dynamic resistance of the Zener diode in its regulation region. Lower impedance values indicate better voltage regulation performance. The original BZX55A13-TAP specifies 26 Ohms. Substitute parts range from 12 Ohms (1N3521A) to 36 Ohms (1N6003A).

Q: Can I substitute a part with ±5% tolerance for an application designed for ±1% tolerance?

A: Substitution depends on circuit requirements. If the application design margin accommodates ±5% voltage variation, substitution is acceptable. If the circuit requires ±1% precision, only parts with ±1% or tighter tolerance (1N5739C, 1N5739D, or BZX55A13-TAP/BZX55B13-TAP) are suitable.

Q: What is the significance of the DO-35 package specification?

A: DO-35 is the axial through-hole package format. All listed substitute parts use this identical package, ensuring mechanical and electrical compatibility with existing PCB designs. No board redesign is required.

Q: Why does BZX79C13-T50A have a higher maximum operating temperature (200°C vs. 175°C)?

A: BZX79C13-T50A is manufactured by onsemi with different thermal design specifications. The extended temperature range provides additional margin for high-temperature environments. This part is suitable for applications requiring operation above 175°C.

Q: Are there inventory differences between substitute options?

A: Yes. BZX79C13-T50A has the highest availability (9926 units), followed by BZX55B13-TAP (4922 units). Microchip parts range from 801 to 1096 units. The original BZX55A13-TAP has 914 units remaining in stock despite obsolete status.

Q: What forward voltage specification should I use for circuit design?

A: Forward voltage varies by part. The original BZX55A13-TAP specifies 1.5 V @ 200 mA. Microchip 1N5739 series specifies 0.9 V @ 10 mA. onsemi BZX79C13-T50A specifies 1.5 V @ 100 mA. Use the specification corresponding to your actual forward current operating point.

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