BZX79-B3V3 Zener Diode 3.3V 400mW Equivalent & Substitute Parts

Part Overview

The BZX79-B3V3,113 is an active-status Zener diode manufactured by Nexperia USA Inc., rated for 3.3 V nominal Zener voltage with 400 mW maximum power dissipation. This through-hole component operates across the temperature range of -65°C to 200°C and is packaged in DO-204AH (DO-35) axial configuration. The part is ROHS3 compliant and REACH unaffected, making it suitable for regulated electronic applications requiring voltage regulation or transient protection at 3.3 V levels. Substitute parts are identified based on identical electrical specifications and mechanical compatibility within the same package family.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	3.3	V
Tolerance	±2%	—
Power - Max	400	mW
Impedance (Max)	95	Ohms
Current - Reverse Leakage @ Vr	5	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	—
Supplier Device Package	ALF2	—

Substitute Part Grouping Explanation

Substitute parts for the BZX79-B3V3,113 are identified as parametric equivalents based on strict electrical and mechanical compatibility. The substitution criteria are:

Zener Voltage (Vz): 3.3 V nominal with ±2% tolerance
Power Rating: 400 mW maximum
Impedance: 95 Ohms maximum
Reverse Leakage Current: 5 µA @ 1 V
Forward Voltage: 900 mV maximum @ 10 mA
Operating Temperature: -65°C to 200°C
Package Type: DO-204AH / DO-35 axial through-hole configuration
Supplier Device Package: ALF2

All identified substitutes maintain these electrical parameters and mechanical specifications. Differences exist only in packaging format (Cut Tape versus Bulk) and inventory availability, which do not affect functional equivalence.

Parameter Comparison

Parameter	BZX79-B3V3,113	BZX79-B3V3,133	BZX79-B3V3,143
Manufacturer	Nexperia USA Inc.	NXP USA Inc.	Nexperia USA Inc.
Voltage - Zener (Nom)	3.3 V	3.3 V	3.3 V
Tolerance	±2%	±2%	±2%
Power - Max	400 mW	400 mW	400 mW
Impedance (Max)	95 Ohms	95 Ohms	95 Ohms
Current - Reverse Leakage @ Vr	5 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
Operating Temperature	-65°C to 200°C	-65°C to 200°C	-65°C to 200°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial
Supplier Device Package	ALF2	ALF2	ALF2
Product Status	Active	Active	Active
RoHS Status	ROHS3 Compliant	Not specified	ROHS3 Compliant
Packaging Format	Cut Tape (CT)	Bulk	Cut Tape (CT)
Inventory (Pcs)	10467	70921	5662

Engineering Selection Recommendations

All three parts—BZX79-B3V3,113, BZX79-B3V3,133, and BZX79-B3V3,143—are functionally equivalent for applications requiring a 3.3 V Zener diode with 400 mW power rating in DO-35 axial package configuration.

Selection Criteria:

BZX79-B3V3,113: Primary choice for applications requiring ROHS3 compliance certification. Cut Tape packaging suitable for automated assembly processes. Moderate inventory availability.
BZX79-B3V3,133: Suitable for high-volume procurement due to largest inventory (70921 Pcs). Bulk packaging format appropriate for manual assembly or reel-fed operations. Manufacturer designation as NXP USA Inc. (Nexperia parent company). RoHS status not specified in documentation.
BZX79-B3V3,143: Alternative option with ROHS3 compliance. Cut Tape packaging. Lowest inventory availability among the three options.

All parts maintain identical electrical performance across the specified operating temperature range (-65°C to 200°C) and are rated for equivalent reverse leakage, forward voltage, and impedance characteristics. Selection should be based on packaging format requirements, compliance documentation needs, and inventory availability for the specific application.

Frequently Asked Questions (FAQ)

Q: Are BZX79-B3V3,133 and BZX79-B3V3,143 direct substitutes for BZX79-B3V3,113?

A: Yes. All three parts are parametric equivalents with identical Zener voltage (3.3 V), power rating (400 mW), impedance (95 Ohms maximum), reverse leakage current (5 µA @ 1 V), forward voltage (900 mV @ 10 mA), and operating temperature range (-65°C to 200°C). They share the same DO-35 axial package configuration and ALF2 supplier device package designation.

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

A: Cut Tape (CT) packaging supplies components on individual tape segments suitable for automated pick-and-place assembly equipment. Bulk packaging supplies loose components in larger quantities, typically for manual assembly or reel-fed operations. Both formats contain electrically identical components.

Q: Does the difference in manufacturer designation (Nexperia USA Inc. versus NXP USA Inc.) affect compatibility?

A: No. NXP USA Inc. is the parent company of Nexperia. Both designations refer to the same manufacturer entity. The BZX79-B3V3,133 maintains identical electrical specifications and package configuration.

Q: Which part should I select if ROHS3 compliance is required?

A: BZX79-B3V3,113 or BZX79-B3V3,143 are both ROHS3 compliant. BZX79-B3V3,133 does not specify RoHS status in the provided documentation.

Q: Can these parts be used interchangeably in existing circuit designs?

A: Yes. All three parts are mechanically and electrically interchangeable within the same PCB footprint and circuit application. No design modifications are required when substituting between these part numbers.

Q: What inventory considerations should influence part selection?

A: BZX79-B3V3,133 offers the highest inventory availability (70921 Pcs), suitable for large-volume production runs. BZX79-B3V3,113 (10467 Pcs) and BZX79-B3V3,143 (5662 Pcs) provide moderate and limited availability respectively. Selection should align with production volume and lead-time requirements.

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