BZX79-C3V9,113 Equivalent & Substitute Parts

Part Overview

The BZX79-C3V9,113 is a through-hole Zener diode manufactured by Nexperia USA Inc., rated at 3.9 V nominal with 400 mW maximum power dissipation and ±5% tolerance. The device is packaged in DO-204AH (DO-35) axial configuration with ALF2 supplier designation. This part maintains Active product status and is RoHS3 compliant with REACH unaffected classification.

Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter ranges while maintaining functional compatibility in the target application circuit.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	3.9	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 Range	-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 are classified into two categories based on electrical parameter alignment with the main part BZX79-C3V9,113:

Parametric Equivalents maintain identical or tighter tolerance specifications, matching the 3.9 V nominal Zener voltage, 400 mW power rating, and core electrical characteristics. These parts are direct functional replacements:

Tolerance specification: ±5% or tighter (±2%)
Voltage - Zener (Nom): 3.9 V
Power - Max: 400 mW
Impedance (Max): 90 Ohms
Operating Temperature: -65°C to 200°C minimum
Mounting Type: Through Hole
Package / Case: DO-204AH, DO-35, Axial

Similar Parts share the 3.9 V nominal Zener voltage and through-hole axial package but differ in power rating (500 mW vs. 400 mW), impedance characteristics, or operating temperature range. These parts provide functional alternatives where higher power dissipation capability or different impedance profiles are acceptable:

Voltage - Zener (Nom): 3.9 V
Power - Max: 500 mW (higher than main part)
Impedance (Max): 20 or 90 Ohms (varies by manufacturer)
Operating Temperature: -65°C to 175°C or -65°C to 200°C
Mounting Type: Through Hole
Package / Case: DO-204AH, DO-35, Axial

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Zener (Nom) (V)	Tolerance (%)	Power - Max (mW)	Impedance (Max) (Ohms)	Current - Reverse Leakage @ Vr (µA @ 1 V)	Voltage - Forward (Vf) (Max) @ If	Operating Temperature (°C)	Packaging	RoHS Status
BZX79-C3V9,113	Nexperia USA Inc.	3.9	±5	400	90	3 @ 1 V	900 mV @ 10 mA	-65 to 200	Cut Tape (CT)	ROHS3 Compliant
BZX79-B3V9,113	Nexperia USA Inc.	3.9	±2	400	90	3 @ 1 V	900 mV @ 10 mA	-65 to 200	Cut Tape (CT)	ROHS3 Compliant
BZX79-B3V9,133	Nexperia USA Inc.	3.9	±2	400	90	3 @ 1 V	900 mV @ 10 mA	-65 to 200	Cut Tape (CT)	ROHS3 Compliant
BZX79-B3V9,143	NXP USA Inc.	3.9	±2	400	90	3 @ 1 V	900 mV @ 10 mA	-65 to 200	Bulk	Not specified
BZX79-C3V9,133	Nexperia USA Inc.	3.9	±5	400	90	3 @ 1 V	900 mV @ 10 mA	-65 to 200	Cut Tape (CT)	ROHS3 Compliant
1N748A-1	Microchip Technology	3.9	±5	500	20	2 @ 1 V	1.1 V @ 200 mA	-65 to 175	Bulk	RoHS non-compliant
BZX79C3V9	Taiwan Semiconductor Corporation	3.9	±5	500	90	10 @ 1 V	1.5 V @ 100 mA	-65 to 175	Tape & Reel (TR)	ROHS3 Compliant
BZX79C3V9-T50A	onsemi	3.9	±5	500	90	10 @ 1 V	1.5 V @ 100 mA	-65 to 200	Cut Tape (CT)	ROHS3 Compliant

Engineering Selection Recommendations

Parametric Equivalent Selection (Direct Replacement)

The parts BZX79-B3V9,113, BZX79-B3V9,133, BZX79-B3V9,143, and BZX79-C3V9,133 are parametric equivalents suitable for direct substitution in applications where the BZX79-C3V9,113 is specified. These parts maintain the 3.9 V nominal Zener voltage, 400 mW power rating, and identical impedance characteristics.

BZX79-B3V9 series parts offer tighter tolerance (±2% vs. ±5%), providing improved voltage regulation accuracy. The difference between Cut Tape (CT) and Bulk packaging affects procurement and handling but does not impact electrical performance.

All parametric equivalents maintain Active product status and RoHS3 compliance, ensuring regulatory alignment with the original part.

Similar Part Selection (Functional Alternative)

The parts 1N748A-1, BZX79C3V9, and BZX79C3V9-T50A share the 3.9 V nominal Zener voltage but feature 500 mW power rating, representing a 25% increase in power dissipation capability. These parts are suitable for applications where higher thermal margin is required.

BZX79C3V9-T50A (onsemi) maintains the widest operating temperature range (-65°C to 200°C) and RoHS3 compliance, matching the thermal envelope of the main part while providing enhanced power handling.

1N748A-1 (Microchip Technology) exhibits lower impedance (20 Ohms vs. 90 Ohms) and reduced reverse leakage current (2 µA vs. 3 µA), but operates to 175°C maximum and carries RoHS non-compliant status, limiting suitability for new designs requiring regulatory compliance.

BZX79C3V9 (Taiwan Semiconductor Corporation) provides RoHS3 compliance and 500 mW rating but operates to 175°C maximum and exhibits higher reverse leakage current (10 µA), requiring circuit evaluation for leakage-sensitive applications.

Frequently Asked Questions (FAQ)

Q: Can BZX79-B3V9,113 replace BZX79-C3V9,113 in all applications?

A: Yes. BZX79-B3V9,113 is a parametric equivalent with identical electrical specifications except for tighter tolerance (±2% vs. ±5%). The improved tolerance provides better voltage regulation accuracy. Both parts share identical power rating, impedance, operating temperature range, and package configuration.

Q: What is the difference between Cut Tape (CT) and Bulk packaging?

A: Cut Tape packaging supplies components on continuous tape suitable for automated pick-and-place assembly. Bulk packaging supplies loose components in quantities. Electrical performance is identical; packaging selection depends on assembly process requirements and procurement volume.

Q: Can 1N748A-1 be used as a substitute for BZX79-C3V9,113?

A: 1N748A-1 shares the 3.9 V nominal Zener voltage and through-hole axial package but differs in power rating (500 mW vs. 400 mW), impedance (20 Ohms vs. 90 Ohms), and operating temperature maximum (175°C vs. 200°C). Additionally, 1N748A-1 is RoHS non-compliant. Use only in applications where higher power dissipation is acceptable and RoHS compliance is not required.

Q: What are the key parameters that determine substitution compatibility?

A: Substitution compatibility is determined by: (1) Voltage - Zener (Nom) at 3.9 V, (2) Tolerance specification (±5% or tighter), (3) Power - Max rating (400 mW minimum for direct replacement), (4) Impedance (Max) at 90 Ohms, (5) Operating Temperature range (-65°C to 200°C minimum), and (6) Through-hole axial package configuration (DO-204AH, DO-35).

Q: Why do similar parts have 500 mW rating instead of 400 mW?

A: Higher power rating indicates greater thermal dissipation capability. Parts rated 500 mW can safely operate at higher current levels without exceeding junction temperature limits. This provides design margin in applications with variable or peak current conditions. The 3.9 V Zener voltage remains identical across all ratings.

Q: Is BZX79C3V9-T50A suitable for high-temperature applications?

A: BZX79C3V9-T50A operates from -65°C to 200°C, matching the thermal envelope of BZX79-C3V9,113. It is suitable for applications requiring the full temperature range. The 500 mW power rating provides additional thermal margin compared to the 400 mW main part.

Q: What compliance certifications should be verified for new designs?

A: RoHS3 compliance and REACH unaffected status are specified for all parametric equivalent parts and most similar parts. 1N748A-1 is RoHS non-compliant and should not be used in designs requiring regulatory compliance. All parts carry EAR99 ECCN classification and HTSUS 8541.10.0050 tariff code.

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