BZX79-C4V3,113 Equivalent & Substitute Parts

Part Overview

The BZX79-C4V3,113 is a through-hole zener diode manufactured by Nexperia USA Inc., rated at 4.3 V nominal zener voltage with 400 mW maximum power dissipation. The device is packaged in DO-204AH (DO-35) axial configuration and operates across a temperature range of -65°C to 200°C. This component is classified as Active and maintains ROHS3 compliance with REACH Unaffected status.

Equivalent and substitute parts are identified when design requirements permit tolerance in zener voltage, power rating, impedance characteristics, or packaging format while maintaining functional compatibility in circuit applications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	4.3	V
Tolerance	±5%	%
Power - Max	400	mW
Impedance (Max)	90	Ohms
Current - Reverse Leakage @ Vr	3	µA @ 1 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
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the BZX79-C4V3,113 are classified into two categories based on electrical and mechanical parameter alignment:

Parametric Equivalents maintain identical or superior specifications across all critical parameters: zener voltage (4.3 V), power rating (400 mW), impedance (90 Ohms), operating temperature range (-65°C to 200°C), and through-hole axial packaging. These parts differ only in tolerance specification or packaging format (Cut Tape versus Bulk).

Similar Parts share the same zener voltage (4.3 V) and axial through-hole package but differ in one or more of the following parameters: power rating (500 mW versus 400 mW), reverse leakage current (5 µA versus 3 µA), forward voltage characteristics, impedance, operating temperature maximum (175°C versus 200°C), or manufacturer source. These parts are suitable for applications where the increased power rating or alternative specifications do not conflict with circuit design constraints.

The critical parameters determining substitution eligibility are: Voltage - Zener (Nom), Power - Max, Impedance (Max), Operating Temperature range, Mounting Type, and Package / Case format.

Parameter Comparison

Parameter	BZX79-C4V3,113	BZX79-B4V3,113	BZX79-C4V3,133	1N748A-1	BZX79C4V3	BZX79C4V3-T50A
Manufacturer	Nexperia USA Inc.	NXP Semiconductors	Nexperia USA Inc.	Microchip Technology	Taiwan Semiconductor Corporation	onsemi
Voltage - Zener (Nom)	4.3 V	4.3 V	4.3 V	3.9 V	4.3 V	4.3 V
Tolerance	±5%	±2%	±5%	±5%	±5%	±5%
Power - Max	400 mW	400 mW	400 mW	500 mW	500 mW	500 mW
Impedance (Max)	90 Ohms	90 Ohms	90 Ohms	20 Ohms	90 Ohms	90 Ohms
Current - Reverse Leakage @ Vr	3 µA @ 1 V	3 µA @ 1 V	3 µA @ 1 V	2 µA @ 1 V	5 µA @ 1 V	5 µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA	1.1 V @ 200 mA	1.5 V @ 100 mA	1.5 V @ 100 mA
Operating Temperature	-65 to 200°C	-65 to 200°C	-65 to 200°C	-65 to 175°C	-65 to 175°C	-65 to 200°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

BZX79-B4V3,113 (NXP Semiconductors) is a parametric equivalent suitable for direct substitution. This part maintains identical power rating (400 mW), impedance (90 Ohms), operating temperature range (-65°C to 200°C), and package format. The tighter tolerance specification (±2% versus ±5%) provides improved voltage accuracy. ROHS3 compliance and REACH Unaffected status align with the main part.

BZX79-C4V3,133 (Nexperia USA Inc.) is a parametric equivalent with identical electrical specifications and packaging. This part differs only in packaging format (Cut Tape) and represents an alternative sourcing option from the same manufacturer. ROHS3 compliance and REACH Unaffected status are maintained.

BZX79C4V3 (Taiwan Semiconductor Corporation) is a similar part with matching zener voltage (4.3 V) and impedance (90 Ohms). The power rating is increased to 500 mW, and reverse leakage current is specified at 5 µA @ 1 V. Operating temperature maximum is reduced to 175°C. This part is suitable for applications where the higher power dissipation capability does not introduce thermal management conflicts and the reduced temperature range is acceptable. ROHS3 compliance is maintained.

BZX79C4V3-T50A (onsemi) is a similar part with matching zener voltage (4.3 V), impedance (90 Ohms), and operating temperature range (-65°C to 200°C). The power rating is increased to 500 mW, and reverse leakage current is specified at 5 µA @ 1 V. This part is suitable for applications requiring the higher power rating while maintaining the full temperature operating range. ROHS3 compliance is maintained.

1N748A-1 (Microchip Technology) is a similar part with a lower zener voltage (3.9 V) and higher power rating (500 mW). The impedance is significantly lower (20 Ohms), and the operating temperature maximum is reduced to 175°C. This part is suitable only for applications where the 3.9 V zener voltage is acceptable and the reduced temperature range does not conflict with design requirements. RoHS non-compliance status requires evaluation against procurement specifications.

Frequently Asked Questions (FAQ)

Q: Can BZX79-B4V3,113 replace BZX79-C4V3,113 in all applications?

A: Yes. BZX79-B4V3,113 maintains identical power rating, impedance, operating temperature range, and package format. The ±2% tolerance is tighter than the ±5% specification of the main part, providing improved voltage accuracy without introducing incompatibility.

Q: What is the primary difference between BZX79-C4V3,113 and BZX79-C4V3,133?

A: Both parts are manufactured by Nexperia USA Inc. and share identical electrical specifications. The difference is packaging format: BZX79-C4V3,113 is supplied in Cut Tape (CT), while BZX79-C4V3,133 is also supplied in Cut Tape (CT). Both are suitable for direct substitution.

Q: Can parts with 500 mW power rating replace the 400 mW main part?

A: Parts with 500 mW power rating (BZX79C4V3, BZX79C4V3-T50A) can replace the 400 mW main part in applications where the circuit design does not depend on the lower power dissipation limit. The higher power rating provides additional thermal margin and does not introduce functional incompatibility.

Q: Is 1N748A-1 a suitable substitute?

A: 1N748A-1 has a lower zener voltage (3.9 V versus 4.3 V) and is not suitable for applications requiring the 4.3 V specification. Additionally, this part is RoHS non-compliant, which may conflict with procurement or regulatory requirements. Substitution is limited to applications where the 3.9 V voltage is acceptable and RoHS compliance is not mandated.

Q: What is the impact of operating temperature range differences?

A: BZX79C4V3 and 1N748A-1 have a maximum operating temperature of 175°C, compared to 200°C for the main part and other equivalents. These parts are suitable only for applications where the circuit design does not require operation above 175°C.

Q: Are all substitute parts compliant with ROHS3 and REACH requirements?

A: BZX79-B4V3,113, BZX79-C4V3,133, BZX79C4V3, and BZX79C4V3-T50A are ROHS3 compliant with REACH Unaffected status. 1N748A-1 is RoHS non-compliant and requires evaluation against specific procurement standards.

Q: Can the impedance differences affect circuit performance?

A: Impedance differences are significant only in high-frequency or precision regulation applications. 1N748A-1 has impedance of 20 Ohms compared to 90 Ohms for other parts. For standard voltage regulation applications, impedance differences within the specified range do not introduce functional incompatibility.

Q: What packaging formats are available for these substitute parts?

A: All substitute parts are supplied in through-hole axial configuration (DO-204AH, DO-35). Packaging options vary by supplier: BZX79-B4V3,113 is supplied in Bulk, BZX79-C4V3,133 in Cut Tape, BZX79C4V3 in Tape & Reel, and BZX79C4V3-T50A in Tape & Box. Selection depends on procurement volume and handling requirements.

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