BZX79-B18,113 Equivalent & Substitute Parts

Part Overview

The BZX79-B18,113 is a Zener diode manufactured by Nexperia USA Inc., rated at 18 V nominal with 400 mW power dissipation and ±2% tolerance. This through-hole component operates across a temperature range of -65°C to 200°C and is packaged in DO-204AH/DO-35 axial configuration. The part maintains Active product status and holds ROHS3 compliance with unlimited moisture sensitivity rating (MSL 1). Equivalent substitute parts are necessary when the primary part number becomes unavailable due to inventory constraints, supply chain disruptions, or packaging format requirements while maintaining identical electrical and mechanical specifications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	18	V
Tolerance	±2	%
Power - Max	400	mW
Impedance (Max)	45	Ohms
Current - Reverse Leakage @ Vr	50	nA @ 12.6 V
Voltage - Forward (Max) @ If	900	mV @ 10 mA
Operating Temperature Range	-65 to 200	°C
Mounting Type	Through Hole
Package / Case	DO-204AH, DO-35, Axial

Substitute Part Grouping Explanation

Substitution eligibility for the BZX79-B18,113 is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute parts BZX79-B18,133 and BZX79-B18,143 are classified as parametric equivalents because they maintain identical specifications in the following key areas:

Zener voltage: 18 V nominal
Tolerance: ±2%
Maximum power dissipation: 400 mW
Maximum impedance: 45 Ohms
Reverse leakage current: 50 nA @ 12.6 V
Forward voltage: 900 mV @ 10 mA
Operating temperature range: -65°C to 200°C
Mounting configuration: Through Hole
Package type: DO-204AH, DO-35, Axial

The primary distinction between these parts lies in packaging format (Cut Tape versus Bulk) and inventory availability. All three parts share identical electrical performance characteristics and are suitable for direct substitution in circuit applications where the BZX79-B18,113 is specified.

Parameter Comparison

Parameter	BZX79-B18,113	BZX79-B18,133	BZX79-B18,143
Manufacturer	Nexperia USA Inc.	NXP USA Inc.	NXP USA Inc.
Category	Diodes, Zener	Diodes, Zener	Diodes, Zener
Voltage - Zener (Nom)	18 V	18 V	18 V
Tolerance	±2%	±2%	±2%
Power - Max	400 mW	400 mW	400 mW
Impedance (Max)	45 Ohms	45 Ohms	45 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 12.6 V	50 nA @ 12.6 V	50 nA @ 12.6 V
Voltage - Forward (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA
Operating Temperature Range	-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
ECCN	EAR99	EAR99	EAR99
HTSUS	8541.10.0050	8541.10.0050	8541.10.0050

Engineering Selection Recommendations

All three parts—BZX79-B18,113, BZX79-B18,133, and BZX79-B18,143—are Active products manufactured by Nexperia/NXP and maintain full compliance with ROHS3 and EAR99 export classification standards. Selection between these equivalents should be based on packaging requirements and supply availability:

BZX79-B18,113 is supplied in Cut Tape (CT) packaging format, suitable for automated assembly processes and tape-and-reel handling systems.

BZX79-B18,133 is supplied in Bulk packaging with 2,000 pieces in current inventory, appropriate for manual assembly or lower-volume production runs.

BZX79-B18,143 is supplied in Bulk packaging with 102,019 pieces in current inventory, providing maximum availability for high-volume applications or long-term stock requirements.

All three parts deliver identical electrical performance and are interchangeable at the circuit level. Selection should prioritize availability and packaging compatibility with existing assembly infrastructure.

Frequently Asked Questions (FAQ)

Q: Can BZX79-B18,133 or BZX79-B18,143 be used as direct replacements for BZX79-B18,113 in existing circuit designs?

A: Yes. All three parts are parametric equivalents with identical electrical specifications including 18 V zener voltage, 400 mW power rating, ±2% tolerance, and operating temperature range. Direct substitution is valid at the circuit level.

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

A: Cut Tape (CT) packaging supplies components on continuous tape suitable for automated pick-and-place assembly equipment. Bulk packaging supplies loose components in containers, suitable for manual assembly or tape-and-reel reprocessing. Electrical performance is identical between formats.

Q: Are there any compliance or certification differences between these three part numbers?

A: No. All three parts maintain identical ROHS3 compliance status, EAR99 export classification, and HTSUS tariff code (8541.10.0050). Compliance and regulatory status are equivalent across all three options.

Q: Which substitute part should be selected for maximum inventory availability?

A: BZX79-B18,143 provides the highest current inventory level at 102,019 pieces, followed by BZX79-B18,133 at 2,000 pieces. Selection should align with project timeline and volume requirements.

Q: Do these parts require any special handling or storage considerations?

A: All three parts carry MSL 1 (Unlimited) moisture sensitivity rating, indicating no special moisture control measures are required during storage or handling. Standard component storage practices apply.

Q: Are the DO-204AH and DO-35 package designations interchangeable?

A: Both designations refer to the same axial through-hole package configuration used for these zener diodes. The parts are mechanically and electrically identical in this package format.

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