BZX79-B4V3,113 Equivalent & Substitute Parts

Part Overview

The BZX79-B4V3,113 is an active zener diode manufactured by Nexperia USA Inc., rated at 4.3 V nominal zener voltage with 400 mW maximum power dissipation. This through-hole component operates across an extended temperature range of -65°C to 200°C and is packaged in the DO-204AH (DO-35) axial configuration. The device maintains ROHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified to provide equivalent electrical performance in applications where the original part is unavailable, discontinued, or where alternative sourcing is required for supply chain optimization.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	4.3	V
Tolerance	±2%	—
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 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 of zener diodes is determined by matching the following critical electrical and mechanical parameters:

Primary Matching Criteria:

Zener voltage (Vz) nominal value: 4.3 V
Package type: DO-204AH (DO-35) axial through-hole configuration
Mounting compatibility: Through-hole PCB assembly

Secondary Compatibility Factors:

Maximum power dissipation rating (equal or greater than 400 mW)
Zener voltage tolerance (±2% or tighter preferred)
Impedance characteristics (Zzt)
Reverse leakage current specifications
Operating temperature range coverage
Regulatory compliance (ROHS3, REACH)

The substitute part 1N5229B-TAP meets the primary matching criteria with identical zener voltage and compatible package configuration. Differences in secondary parameters are documented in the comparison table below.

Parameter Comparison

Parameter	BZX79-B4V3,113	1N5229B-TAP	Unit
Manufacturer	Nexperia USA Inc.	Vishay General Semiconductor - Diodes Division	—
Voltage - Zener (Nom)	4.3	4.3	V
Tolerance	±2%	±5%	—
Power - Max	400	500	mW
Impedance (Max)	90	22	Ohms
Current - Reverse Leakage @ Vr	3	5	µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	900 @ 10 mA	1.1 @ 200 mA	mV
Operating Temperature Range	-65 to 200	Up to 175	°C
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	—
Mounting Type	Through Hole	Through Hole	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	—
Product Status	Active	Active	—
Qualification	—	AEC-Q101	—

Engineering Selection Recommendations

BZX79-B4V3,113 (Primary Selection)

Select the original BZX79-B4V3,113 when the application requires the tighter zener voltage tolerance of ±2% and the extended upper operating temperature of 200°C. This part is active in production with full inventory availability and maintains ROHS3 compliance.

1N5229B-TAP (Substitute Selection)

The 1N5229B-TAP serves as a functional substitute when the BZX79-B4V3,113 is unavailable. This part provides equivalent 4.3 V zener voltage in the same DO-204AH (DO-35) axial package with through-hole mounting compatibility. The substitute offers higher maximum power dissipation (500 mW versus 400 mW) and lower impedance (22 Ohms versus 90 Ohms), providing improved performance margin in current-limiting applications. The 1N5229B-TAP carries AEC-Q101 automotive qualification and ROHS3 compliance.

Substitution Constraints:

The 1N5229B-TAP operates to a maximum temperature of 175°C, which is 25°C below the BZX79-B4V3,113 specification. Applications requiring operation above 175°C must use the original part. The substitute exhibits a wider zener voltage tolerance (±5% versus ±2%), which may affect precision voltage reference applications requiring tighter regulation.

Frequently Asked Questions (FAQ)

Q: Can the 1N5229B-TAP directly replace the BZX79-B4V3,113 in all applications?

A: Direct replacement is possible for applications operating at or below 175°C with zener voltage tolerance requirements of ±5% or wider. Applications requiring the full -65°C to 200°C temperature range or ±2% voltage tolerance must use the original BZX79-B4V3,113.

Q: Are the package dimensions identical between these parts?

A: Both parts use the DO-204AH (DO-35) axial package configuration with identical through-hole mounting compatibility. Physical dimensions and PCB footprints are equivalent.

Q: What is the significance of the lower impedance in the 1N5229B-TAP?

A: The 1N5229B-TAP impedance of 22 Ohms (versus 90 Ohms in the BZX79-B4V3,113) results in improved voltage regulation and reduced output impedance under load changes. This characteristic benefits current-limiting and voltage reference circuits.

Q: Does the higher power rating of the 1N5229B-TAP affect circuit design?

A: The 500 mW rating of the 1N5229B-TAP provides additional thermal margin compared to the 400 mW BZX79-B4V3,113. Circuit design remains unchanged; the higher rating simply allows operation at higher dissipation levels without exceeding device limits.

Q: Are both parts RoHS compliant?

A: Yes, both the BZX79-B4V3,113 and 1N5229B-TAP are ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

Q: What is the significance of AEC-Q101 qualification on the 1N5229B-TAP?

A: AEC-Q101 qualification indicates the 1N5229B-TAP meets automotive industry reliability and quality standards. This certification is relevant for automotive and high-reliability applications.

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