BZX79-C13,133 Equivalent & Substitute Parts

Part Overview

The BZX79-C13,133 is a Zener diode manufactured by Nexperia USA Inc., rated at 13 V nominal with 400 mW maximum power dissipation and ±5% tolerance. This through-hole component operates across a temperature range of -65°C to 200°C and is packaged in the 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 design flexibility, inventory management, and supply chain continuity for applications requiring 13 V Zener diode functionality.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	13	V
Tolerance	±5%	—
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	-65 to 200	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—

Substitute Part Grouping Explanation

Substitution of the BZX79-C13,133 is determined by the following critical parameters: nominal Zener voltage (13 V), maximum power rating, tolerance specification, impedance characteristics, and through-hole mounting compatibility. Parts are grouped into three categories based on parametric alignment:

Parametric Equivalents share identical or superior electrical specifications with matching package configurations. These parts maintain the 13 V nominal voltage, 400 mW power rating, and DO-35 axial package, with tolerance variations of ±2% or ±5%.

Direct Substitutes provide 13 V Zener functionality with enhanced power ratings (5 W) and different package geometries (T-18 axial), suitable for applications requiring higher power dissipation while maintaining voltage regulation at 13 V.

Similar Alternatives offer comparable Zener regulation with variations in nominal voltage (12 V), power rating (500 mW), impedance, or package type (DO-7). These parts are applicable where voltage tolerance and power requirements permit deviation from the primary specification.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Vf (Max) @ If	Package	Product Status
BZX79-C13,133	Nexperia USA Inc.	13 V	±5%	400 mW	30 Ω	900 mV @ 10 mA	DO-204AH (DO-35)	Active
BZX79-B13,133	NXP USA Inc.	13 V	±2%	400 mW	30 Ω	900 mV @ 10 mA	DO-204AH (DO-35)	Active
BZX79-B13,143	NXP USA Inc.	13 V	±2%	400 mW	30 Ω	900 mV @ 10 mA	DO-204AH (DO-35)	Active
BZX79-C13,143	NXP USA Inc.	13 V	±5%	400 mW	30 Ω	900 mV @ 10 mA	DO-204AH (DO-35)	Active
1N5350BRLG	onsemi	13 V	±5%	5 W	2.5 Ω	1.2 V @ 1 A	T-18 Axial	Active
1N5243B-TAP	Vishay General Semiconductor	13 V	±5%	500 mW	13 Ω	1.1 V @ 200 mA	DO-204AH (DO-35)	Active
1N759A-1	Microchip Technology	12 V	±5%	500 mW	10 Ω	1.1 V @ 200 mA	DO-204AH (DO-35)	Active
1N963B	Microchip Technology	12 V	±5%	500 mW	11.5 Ω	1.1 V @ 200 mA	DO-204AA (DO-7)	Active
BZX79C13-T50A	onsemi	13 V	±5%	500 mW	30 Ω	1.5 V @ 100 mA	DO-204AH (DO-35)	Active

Engineering Selection Recommendations

Parametric Equivalents (BZX79-B13,133, BZX79-B13,143, BZX79-C13,143): These parts are direct replacements for the BZX79-C13,133 with identical electrical performance and package configuration. BZX79-B13,133 and BZX79-B13,143 offer tighter tolerance (±2%) compared to the primary part's ±5%, providing improved voltage regulation accuracy. All three equivalents are Active products with ROHS3 compliance and are suitable for direct substitution in existing designs without circuit modification.

Direct Substitute (1N5350BRLG): This onsemi part maintains the 13 V nominal voltage and ±5% tolerance but provides significantly higher power dissipation (5 W versus 400 mW) with lower impedance (2.5 Ω versus 30 Ω). The T-18 axial package differs from the DO-35 configuration. This part is applicable for applications requiring enhanced thermal performance and higher current handling while maintaining 13 V regulation. Physical package dimensions must be verified for PCB layout compatibility.

Similar Alternatives (1N5243B-TAP, 1N759A-1, 1N963B, BZX79C13-T50A): These parts provide comparable Zener functionality with specification variations. The 1N5243B-TAP and BZX79C13-T50A maintain 13 V nominal voltage with 500 mW power rating and DO-35 packaging, offering marginal power increase over the primary part. The 1N759A-1 and 1N963B operate at 12 V nominal voltage, representing a 1 V reduction from the primary specification; these parts are applicable only where circuit design permits 12 V operation. The 1N963B uses DO-7 package, requiring physical layout verification. All similar alternatives are Active products with ROHS3 compliance (except 1N759A-1 and 1N963B, which are RoHS non-compliant).

Frequently Asked Questions (FAQ)

Q: Can BZX79-B13,133 directly replace BZX79-C13,133 in production?

A: Yes. Both parts share identical nominal voltage (13 V), power rating (400 mW), impedance (30 Ω), and DO-35 package configuration. The BZX79-B13,133 provides tighter tolerance (±2% versus ±5%), which improves voltage regulation accuracy. No circuit modification is required.

Q: What is the primary difference between BZX79-C13,133 and 1N5350BRLG?

A: The 1N5350BRLG provides 5 W power dissipation compared to 400 mW in the BZX79-C13,133, with lower impedance (2.5 Ω versus 30 Ω). The package differs (T-18 axial versus DO-35 axial). Both maintain 13 V nominal voltage. The 1N5350BRLG is suitable for high-power applications but requires PCB layout verification due to package geometry differences.

Q: Are 1N759A-1 and 1N963B suitable replacements for BZX79-C13,133?

A: These parts operate at 12 V nominal voltage, not 13 V. They are applicable only in designs where 12 V Zener regulation is acceptable. Additionally, both parts are RoHS non-compliant, which may conflict with supply chain or regulatory requirements. The 1N963B uses DO-7 package, differing from the DO-35 configuration of the primary part.

Q: What does impedance (Zzt) indicate in Zener diode selection?

A: Impedance (Zzt) represents the dynamic impedance of the Zener diode at specified operating conditions. Lower impedance indicates better voltage regulation and reduced output ripple under load variations. The BZX79-C13,133 has 30 Ω impedance; the 1N5243B-TAP has 13 Ω, providing superior regulation characteristics.

Q: Can 1N5243B-TAP replace BZX79-C13,133 in all applications?

A: The 1N5243B-TAP maintains 13 V nominal voltage and ±5% tolerance with compatible DO-35 packaging. Power rating increases from 400 mW to 500 mW, and impedance decreases from 30 Ω to 13 Ω. These changes improve performance in most applications. However, forward voltage characteristics differ (1.1 V @ 200 mA versus 900 mV @ 10 mA), which may affect circuits with specific bias requirements.

Q: What is the significance of RoHS compliance in part selection?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances regulations, restricting lead and other hazardous materials. BZX79-C13,133, BZX79-B13,133, BZX79-B13,143, BZX79-C13,143, 1N5350BRLG, and 1N5243B-TAP are ROHS3 compliant. Parts 1N759A-1 and 1N963B are RoHS non-compliant and may not be acceptable for applications subject to environmental or regulatory restrictions.

Q: Does package type affect circuit performance?

A: Package type affects physical dimensions, thermal characteristics, and PCB layout requirements. The DO-35 axial package (BZX79-C13,133, 1N5243B-TAP, BZX79C13-T50A) and DO-7 axial package (1N963B) are both through-hole configurations but have different lead spacing and body dimensions. The T-18 package (1N5350BRLG) provides enhanced thermal performance for high-power applications. PCB layout and thermal management must be verified when changing package types.

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