BZX79C30 Equivalent & Substitute Parts

Part Overview

The BZX79C30 is a 30 V Zener diode rated at 500 mW with ±5% tolerance, manufactured by onsemi in a through-hole DO-35 package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The BZX79C30 functions as a voltage regulator and protective element in electronic circuits requiring stable 30 V reference voltage regulation.

Key Parameters

Parameter	Value
Voltage - Zener (Nom) (Vz)	30 V
Tolerance	±5%
Power - Max	500 mW
Impedance (Max) (Zzt)	80 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 21 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 100 mA
Operating Temperature	-65°C ~ 200°C
Mounting Type	Through Hole
Package / Case	DO-204AH, DO-35, Axial
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the BZX79C30 is determined by the following critical parameters: nominal Zener voltage (30 V), voltage tolerance (±5%), maximum power dissipation capability, impedance characteristics, operating temperature range, and through-hole mounting configuration.

Direct substitutes maintain all electrical specifications within the allowed parameters while offering active product status and improved availability. These parts are classified as direct equivalents when they share the same 30 V nominal voltage, ±5% tolerance, equivalent impedance (80 Ohms), and compatible through-hole mounting.

Similar substitutes share the core 30 V nominal voltage and ±5% tolerance but differ in power rating or other secondary characteristics. These parts are suitable for applications where the higher power capability or different impedance does not create circuit incompatibility.

Parameter Comparison

Parameter	BZX79C30 (Main)	BZX79-C30,113	BZX79-C30,133	BZX79-C30,143	1N5077
Manufacturer	onsemi	Nexperia USA Inc.	Nexperia USA Inc.	NXP Semiconductors	Microchip Technology
Voltage - Zener (Nom) (Vz)	30 V	30 V	30 V	30 V	30 V
Tolerance	±5%	±5%	±5%	±5%	±5%
Power - Max	500 mW	400 mW	400 mW	400 mW	3 W
Impedance (Max) (Zzt)	80 Ohms	80 Ohms	80 Ohms	80 Ohms	15 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 21 V	50 nA @ 700 mV	50 nA @ 700 mV	50 nA @ 700 mV	1 µA @ 22.8 V
Operating Temperature	-65°C ~ 200°C	-65°C ~ 200°C	-65°C ~ 200°C	-65°C ~ 200°C	-65°C ~ 175°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active	Active	Active

Engineering Selection Recommendations

BZX79-C30,113 and BZX79-C30,133 are direct substitutes for the BZX79C30. Both parts are manufactured by Nexperia USA Inc. and maintain active product status. These substitutes share identical nominal Zener voltage (30 V), tolerance (±5%), impedance (80 Ohms), and operating temperature range (-65°C ~ 200°C). The power rating is reduced from 500 mW to 400 mW; this reduction is acceptable in applications where circuit design does not require the full 500 mW dissipation capability. Both parts are ROHS3 compliant and REACH unaffected, providing regulatory compliance advantages over the obsolete BZX79C30.

BZX79-C30,143 is a direct substitute manufactured by NXP Semiconductors with identical electrical specifications to BZX79-C30,113 and BZX79-C30,133. This part offers the highest inventory availability (165,839 pcs) among active substitutes and maintains all critical parameters for direct replacement.

1N5077 is a similar substitute manufactured by Microchip Technology. This part maintains the 30 V nominal voltage and ±5% tolerance but differs significantly in power rating (3 W versus 500 mW) and impedance (15 Ohms versus 80 Ohms). The 1N5077 is suitable for applications requiring higher power dissipation or lower impedance characteristics. The operating temperature range is reduced to -65°C ~ 175°C, which may limit use in high-temperature applications.

Selection should prioritize BZX79-C30,113, BZX79-C30,133, or BZX79-C30,143 for direct replacement in existing designs. The 1N5077 is appropriate only when circuit requirements specifically demand higher power capability or lower impedance.

Frequently Asked Questions (FAQ)

Q: Can BZX79-C30,113 directly replace BZX79C30 in all applications?

A: BZX79-C30,113 is a direct substitute for applications where the circuit design does not require the full 500 mW power dissipation. The reduced power rating (400 mW) is the only electrical difference. All other parameters—nominal voltage, tolerance, impedance, and operating temperature—are identical. Circuit analysis must confirm that maximum power dissipation does not exceed 400 mW under worst-case conditions.

Q: What is the difference between BZX79-C30,113, BZX79-C30,133, and BZX79-C30,143?

A: These three parts are electrically identical. The differences are manufacturer (Nexperia USA Inc. for ,113 and ,133; NXP Semiconductors for ,143), packaging format (Cut Tape for ,113 and ,133; Bulk for ,143), and inventory availability. Selection should be based on procurement requirements and available stock.

Q: Is the 1N5077 a suitable replacement for BZX79C30?

A: The 1N5077 shares the same 30 V nominal voltage and ±5% tolerance but differs in power rating (3 W versus 500 mW), impedance (15 Ohms versus 80 Ohms), and maximum operating temperature (175°C versus 200°C). The 1N5077 is suitable only when the circuit specifically requires higher power dissipation capability or lower impedance. Direct substitution without circuit analysis is not recommended.

Q: What packaging options are available for substitutes?

A: BZX79-C30,113 and BZX79-C30,133 are supplied in Cut Tape (CT) packaging. BZX79-C30,143 is supplied in Bulk packaging. The 1N5077 is supplied in Bulk packaging. All parts maintain through-hole axial mounting configuration compatible with BZX79C30 PCB layouts.

Q: Are the substitute parts RoHS and REACH compliant?

A: BZX79-C30,113 and BZX79-C30,133 are ROHS3 compliant. All substitute parts (BZX79-C30,113, BZX79-C30,133, BZX79-C30,143, and 1N5077) are REACH unaffected. The obsolete BZX79C30 does not carry current compliance certifications.

Q: What is the impedance difference between BZX79C30 and 1N5077?

A: BZX79C30 has a maximum impedance of 80 Ohms, while 1N5077 has a maximum impedance of 15 Ohms. Lower impedance results in better voltage regulation and reduced output impedance. This difference may affect circuit performance in precision voltage regulation applications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message