BZX79-B13,143 Equivalent & Substitute Parts

Part Overview

The BZX79-B13,143 is a Zener diode manufactured by Nexperia USA Inc., rated at 13 V nominal with 400 mW maximum power dissipation and ±2% tolerance. This through-hole component operates across a temperature range of -65°C to 200°C and is packaged in DO-204AH/DO-35 axial configuration. The part is currently Active in product status and ROHS3 compliant. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design continuity when the primary part number becomes unavailable or when alternative packaging formats are required.

Substiute Parts

BZX79-B13,143

Nexperia USA Inc.In Stock: 5868BZX79-B13,143 Datasheet

Current PartRFQ

BZX79-B13,133

NXP USA Inc.In Stock: 83501BZX79-B13,133 Datasheet

Parametric EquivalentRFQ

1N5243B

Microchip TechnologyIn Stock: 31951N5243B Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BZX79-B13,143 is determined by the following critical parameters: nominal Zener voltage (13 V), maximum power rating, tolerance specification, reverse leakage characteristics, forward voltage drop, operating temperature range, and through-hole axial package compatibility. Parts are classified into two categories:

Parametric Equivalent: BZX79-B13,133 matches all electrical specifications and thermal operating range of the primary part. The only difference is packaging format (Bulk versus Cut Tape), making this a direct functional equivalent suitable for identical circuit applications.

Similar Substitute: 1N5243B shares the same 13 V nominal Zener voltage and through-hole axial package but differs in power rating (500 mW versus 400 mW), tolerance (±5% versus ±2%), impedance (13 Ohms versus 30 Ohms), reverse leakage current (500 nA @ 9.9 V versus 100 nA @ 8 V), forward voltage (1.5 V @ 200 mA versus 900 mV @ 10 mA), and maximum operating temperature (175°C versus 200°C). This part is suitable for applications where higher power dissipation capacity is acceptable and tighter tolerance is not required.

Parameter Comparison

Engineering Selection Recommendations

BZX79-B13,133 Selection: This parametric equivalent is the preferred substitute when the primary BZX79-B13,143 is unavailable. It maintains identical electrical performance, thermal operating range, and mechanical compatibility. The difference in packaging format (Bulk versus Cut Tape) does not affect circuit functionality. Both parts are manufactured by Nexperia/NXP and carry Active product status. Use this part for direct replacement in all applications where the original specification is required.

1N5243B Selection: This similar substitute is applicable in designs where the following conditions are met: (1) the application can tolerate ±5% Zener voltage tolerance instead of ±2%, (2) higher power dissipation capacity (500 mW) is beneficial or neutral to the circuit design, (3) the maximum operating temperature requirement does not exceed 175°C, and (4) RoHS compliance is not a mandatory requirement. The lower impedance (13 Ohms) and higher reverse leakage current of the 1N5243B may affect circuit performance in precision voltage regulation applications. This part is suitable for general-purpose voltage clamping and protection circuits where tolerance and leakage specifications are less critical.

Frequently Asked Questions (FAQ)

Q: Can BZX79-B13,133 be used as a direct replacement for BZX79-B13,143?

A: Yes. BZX79-B13,133 is a parametric equivalent with identical electrical specifications, tolerance, power rating, impedance, reverse leakage, forward voltage, and operating temperature range. The only difference is packaging format (Bulk versus Cut Tape), which does not affect circuit performance.

Q: What are the key differences between BZX79-B13,143 and 1N5243B?

A: The primary differences are: (1) Tolerance: BZX79-B13,143 is ±2% while 1N5243B is ±5%; (2) Power Rating: 400 mW versus 500 mW; (3) Impedance: 30 Ohms versus 13 Ohms; (4) Reverse Leakage: 100 nA @ 8 V versus 500 nA @ 9.9 V; (5) Maximum Operating Temperature: 200°C versus 175°C; (6) RoHS Compliance: ROHS3 Compliant versus non-compliant.

Q: Is 1N5243B suitable for precision voltage regulation circuits?

A: 1N5243B is not recommended for precision voltage regulation applications requiring ±2% tolerance. The ±5% tolerance and higher impedance (13 Ohms) of the 1N5243B make it suitable for general-purpose voltage clamping and protection circuits where tolerance specifications are less stringent.

Q: Are all three parts compatible with DO-35 axial packaging?

A: Yes. All three parts—BZX79-B13,143, BZX79-B13,133, and 1N5243B—are available in DO-204AH/DO-35 axial through-hole package configuration, ensuring mechanical and pin compatibility.

Q: What is the impact of higher reverse leakage current in 1N5243B?

A: The 1N5243B exhibits higher reverse leakage current (500 nA @ 9.9 V) compared to BZX79-B13,143 (100 nA @ 8 V). This increased leakage may affect circuit performance in applications sensitive to standby current or precision bias networks. Verify circuit requirements before substitution.

Q: Does packaging format (Cut Tape versus Bulk) affect electrical performance?

A: No. Packaging format differences between BZX79-B13,143 (Cut Tape) and BZX79-B13,133 (Bulk) do not affect electrical performance, thermal characteristics, or circuit functionality. The difference is purely in supply and handling format.

Q: What is the maximum operating temperature limitation for 1N5243B?

A: The 1N5243B has a maximum operating temperature of 175°C (TJ), which is 25°C lower than the BZX79-B13,143 specification of 200°C. Applications requiring operation above 175°C must use BZX79-B13,143 or BZX79-B13,133.