BZX79-B13,133 Equivalent & Substitute Parts

Part Overview

The BZX79-B13,133 is a Zener diode manufactured by Nexperia USA Inc., rated at 13 V nominal with 400 mW power dissipation and ±2% tolerance. This component is classified as Active and RoHS3 Compliant. The device is packaged in DO-204AH/DO-35 axial configuration for through-hole mounting applications.

Substitute parts are identified when equivalent electrical performance can be maintained within the specified parameter ranges, or when superior ratings provide functional compatibility for the intended circuit application. Alternative sources and packaging formats may be required due to inventory availability, supply chain considerations, or specific design requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	13	V
Tolerance	±2%	-
Power - Max	400	mW
Impedance (Max)	30	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 8 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature Range	-65 to 200	°C
Mounting Type	Through Hole	-
Package / Case	DO-204AH, DO-35, Axial	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility for the BZX79-B13,133 is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage nominal rating: 13 V
Mounting type: Through Hole
Package compatibility: DO-204AH, DO-35, or equivalent axial configuration

Secondary Compatibility Factors:

Power dissipation rating (minimum 400 mW required for direct substitution)
Operating temperature range (minimum -65°C to 200°C preferred)
Voltage tolerance (±2% to ±5% acceptable)
Impedance and leakage characteristics

Parametric Equivalent: BZX79-B13,143 maintains identical electrical specifications with different packaging format (Bulk vs. Cut Tape).

Similar Alternatives: 1N5243B and 2EZ13D5 provide 13 V zener functionality with enhanced power ratings or impedance characteristics, though with modified tolerance and temperature specifications.

Parameter Comparison

Parameter	BZX79-B13,133	BZX79-B13,143	1N5243B	2EZ13D5
Manufacturer	Nexperia USA Inc.	NXP USA Inc.	Microchip Technology	Microchip Technology
Voltage - Zener (Nom)	13 V	13 V	13 V	13 V
Tolerance	±2%	±2%	±5%	±5%
Power - Max	400 mW	400 mW	500 mW	2 W
Impedance (Max)	30 Ohms	30 Ohms	13 Ohms	5 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 8 V	100 nA @ 8 V	500 nA @ 9.9 V	500 nA @ 9.9 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	1.5 V @ 200 mA	1.2 V @ 200 mA
Operating Temperature Range	-65 to 200°C	-65 to 200°C	-65 to 175°C	-65 to 150°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AH, DO-35	DO-204AH, DO-35	DO-204AH, DO-35	DO-204AL, DO-41
RoHS Status	ROHS3 Compliant	Not specified	RoHS non-compliant	RoHS non-compliant
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

BZX79-B13,143 (Parametric Equivalent)

This part is a direct parametric equivalent to the BZX79-B13,133, differing only in packaging format (Bulk vs. Cut Tape). Selection of BZX79-B13,143 is appropriate when bulk packaging meets procurement requirements. Both parts maintain identical electrical specifications and Active product status. RoHS compliance status for BZX79-B13,143 is not specified in available documentation.

1N5243B (Similar Alternative)

The 1N5243B provides 13 V zener functionality with increased power rating (500 mW vs. 400 mW) and improved impedance characteristics (13 Ohms vs. 30 Ohms). This part is suitable for applications requiring enhanced thermal performance. However, tolerance is ±5% compared to ±2% for the main part, and operating temperature maximum is 175°C versus 200°C. The 1N5243B is RoHS non-compliant. Package compatibility is maintained (DO-204AH, DO-35).

2EZ13D5 (Similar Alternative)

The 2EZ13D5 offers significantly higher power dissipation (2 W vs. 400 mW) with superior impedance performance (5 Ohms vs. 30 Ohms). This part is applicable to high-power applications where thermal margin is critical. Tolerance is ±5%, and maximum operating temperature is 150°C. Package format differs (DO-204AL/DO-41 vs. DO-35), requiring mechanical redesign consideration. The 2EZ13D5 is RoHS non-compliant.

Compliance Considerations

The BZX79-B13,133 is RoHS3 Compliant. Substitute parts 1N5243B and 2EZ13D5 are RoHS non-compliant. Selection of non-compliant alternatives requires verification against end-application regulatory requirements.

Frequently Asked Questions (FAQ)

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

A: Yes. BZX79-B13,143 is a parametric equivalent with identical electrical specifications (13 V, 400 mW, ±2%, 30 Ohms impedance). The only difference is packaging format (Bulk vs. Cut Tape). Both parts are Active status and compatible with DO-204AH/DO-35 through-hole applications.

Q: What are the key differences between 1N5243B and the main part?

A: The 1N5243B maintains the 13 V zener rating and through-hole mounting but differs in: power rating (500 mW vs. 400 mW), impedance (13 Ohms vs. 30 Ohms), tolerance (±5% vs. ±2%), maximum operating temperature (175°C vs. 200°C), and RoHS compliance status (non-compliant vs. ROHS3 Compliant).

Q: Is 2EZ13D5 suitable for direct substitution?

A: 2EZ13D5 provides functional substitution for 13 V zener applications with superior power handling (2 W vs. 400 mW). However, the package format differs (DO-204AL/DO-41 vs. DO-35), requiring mechanical redesign. Tolerance is ±5%, and maximum operating temperature is 150°C. RoHS non-compliance must be evaluated against application requirements.

Q: What is the impact of impedance differences between these parts?

A: Impedance affects voltage regulation stability and transient response. The main part (30 Ohms) and BZX79-B13,143 (30 Ohms) are identical. The 1N5243B (13 Ohms) and 2EZ13D5 (5 Ohms) provide lower impedance, resulting in improved voltage regulation and faster transient response. Lower impedance is beneficial in high-frequency or noise-sensitive applications.

Q: Are there temperature range limitations when substituting?

A: Yes. The main part operates from -65°C to 200°C. The 1N5243B maximum is 175°C, and 2EZ13D5 maximum is 150°C. Applications requiring operation above 175°C must use the main part or BZX79-B13,143. Applications with lower temperature requirements can use alternative parts.

Q: What is the significance of tolerance differences?

A: The main part specifies ±2% tolerance, providing tighter voltage regulation. Substitute parts 1N5243B and 2EZ13D5 specify ±5% tolerance, resulting in wider voltage variation. Applications requiring precise voltage regulation should prioritize the ±2% tolerance specification.

Q: How does RoHS compliance affect part selection?

A: The main part BZX79-B13,133 is ROHS3 Compliant. Substitute parts 1N5243B and 2EZ13D5 are RoHS non-compliant. Applications subject to RoHS regulations (EU, California, or customer-mandated) must use the main part or BZX79-B13,143. Non-regulated applications may use any part.

Q: Can these parts be used interchangeably in PCB designs?

A: BZX79-B13,133 and BZX79-B13,143 are fully interchangeable (identical package DO-35). The 1N5243B is also compatible with DO-35 package. The 2EZ13D5 uses DO-204AL/DO-41 package, requiring PCB redesign. Mechanical compatibility must be verified before substitution.

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