BZX79-C18,113 Equivalent & Substitute Parts

Part Overview

The BZX79-C18,113 is an 18 V Zener diode rated at 400 mW with ±5% tolerance, manufactured by Nexperia USA Inc. in the DO-204AH (DO-35) axial through-hole package. This component is classified as Active and is ROHS3 compliant. Alternative part numbers are necessary when the primary part is unavailable, when different tolerance specifications are required, or when alternative packaging formats are needed for specific procurement or assembly requirements.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	18 V
Tolerance	±5%
Power - Max	400 mW
Impedance (Max)	45 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 12.6 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA
Operating Temperature	-65°C ~ 200°C
Mounting Type	Through Hole
Package / Case	DO-204AH, DO-35, Axial
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the BZX79-C18,113 is determined by the following critical parameters: nominal Zener voltage (18 V), maximum power dissipation capability, tolerance specification, impedance characteristics, and through-hole axial package format. Parts are grouped into two categories:

Parametric Equivalents maintain identical or superior electrical specifications with the same 18 V Zener voltage, 400 mW power rating, 45 Ohm impedance, and through-hole mounting. These parts differ only in tolerance grade (±2% versus ±5%) or packaging format (Cut Tape versus Bulk).

Similar Parts share the same 18 V Zener voltage and tolerance but feature increased power dissipation (500 mW versus 400 mW) and different forward voltage characteristics. These parts are suitable for applications requiring higher power handling capability.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Vf (Max) @ If	Packaging	Package / Case
BZX79-C18,113	Nexperia USA Inc.	18 V	±5%	400 mW	45 Ohms	900 mV @ 10 mA	Cut Tape (CT)	DO-204AH, DO-35, Axial
BZX79-B18,113	Nexperia USA Inc.	18 V	±2%	400 mW	45 Ohms	900 mV @ 10 mA	Cut Tape (CT)	DO-204AH, DO-35, Axial
BZX79-B18,133	NXP USA Inc.	18 V	±2%	400 mW	45 Ohms	900 mV @ 10 mA	Bulk	DO-204AH, DO-35, Axial
BZX79-B18,143	NXP USA Inc.	18 V	±2%	400 mW	45 Ohms	900 mV @ 10 mA	Bulk	DO-204AH, DO-35, Axial
BZX79-C18,133	NXP Semiconductors	18 V	±5%	400 mW	45 Ohms	900 mV @ 10 mA	Bulk	DO-204AH, DO-35, Axial
BZX79-C18,143	Nexperia USA Inc.	18 V	±5%	400 mW	45 Ohms	900 mV @ 10 mA	Cut Tape (CT)	DO-204AH, DO-35, Axial
BZX79C18-T50A	Fairchild Semiconductor	18 V	±5%	500 mW	45 Ohms	1.5 V @ 100 mA	Bulk	DO-204AH, DO-35, Axial

Engineering Selection Recommendations

BZX79-B18,113, BZX79-B18,133, and BZX79-B18,143 are direct parametric equivalents with tighter tolerance specification (±2% versus ±5%). These parts are suitable for applications requiring improved voltage accuracy. All three maintain identical electrical performance with the main part across power dissipation, impedance, and forward voltage characteristics. Selection between these parts depends on packaging requirements: Cut Tape (CT) format for automated assembly or Bulk format for manual assembly or reel applications.

BZX79-C18,133 and BZX79-C18,143 are parametric equivalents matching the original ±5% tolerance specification. BZX79-C18,133 is supplied in Bulk packaging, while BZX79-C18,143 is supplied in Cut Tape (CT) format. Both maintain identical electrical specifications to the BZX79-C18,113.

BZX79C18-T50A is a similar part manufactured by Fairchild Semiconductor with increased power dissipation capability (500 mW versus 400 mW). This part is suitable for applications requiring higher power handling while maintaining the same 18 V Zener voltage and ±5% tolerance. The forward voltage specification differs (1.5 V @ 100 mA versus 900 mV @ 10 mA), reflecting different measurement conditions. All parts are ROHS3 compliant and rated for -65°C to 200°C operating temperature.

Frequently Asked Questions (FAQ)

Q: Can BZX79-B18 series parts replace BZX79-C18,113?

A: Yes. BZX79-B18 series parts (BZX79-B18,113, BZX79-B18,133, BZX79-B18,143) are parametric equivalents with identical electrical specifications except for tolerance. The ±2% tolerance of the B-series provides tighter voltage accuracy compared to the ±5% tolerance of the C-series. All other parameters including power rating, impedance, forward voltage, and operating temperature range are identical.

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

A: Cut Tape (CT) packaging supplies components on continuous tape that is cut to length, suitable for automated pick-and-place assembly equipment. Bulk packaging supplies loose components, suitable for manual assembly or alternative handling methods. Electrical performance is identical between packaging formats.

Q: Is BZX79C18-T50A a direct replacement for BZX79-C18,113?

A: BZX79C18-T50A is a similar part with increased power dissipation (500 mW versus 400 mW). It maintains the same 18 V Zener voltage and ±5% tolerance. The higher power rating makes it suitable for applications requiring greater power handling capability. Forward voltage characteristics differ due to different measurement conditions. This part is suitable for applications where the original 400 mW rating is insufficient.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts maintain ROHS3 compliance and are rated for -65°C to 200°C operating temperature, consistent with the original BZX79-C18,113 specification.

Q: What determines whether a part can substitute for BZX79-C18,113?

A: Substitution is determined by matching the nominal Zener voltage (18 V), maintaining equal or superior power dissipation capability (minimum 400 mW), identical impedance specification (45 Ohms maximum), and through-hole axial package format (DO-204AH, DO-35). Tolerance specifications may vary (±2% or ±5%), and packaging format (Cut Tape or Bulk) may differ without affecting electrical compatibility.

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